Rubber composition, aging-resistant rubber product using the same

Abstract

The present invention discloses a rubber composition, a processing method thereof, and an aging resistant rubber product using the rubber composition. The rubber composition comprises a rubber matrix and essential components, wherein, based on 100 parts by weight of the rubber matrix, the rubber matrix comprises a branched polyethylene with a content represented as A, in which 0<A≤100 parts, and an EPM and an EPDM with a content represented as B, in which 0≤B<100 parts; and the essential components comprise 1.5-10 parts of a crosslinking agent, 30-200 parts of a reinforcing filler, and 5-250 parts of a plasticizer. The rubber composition provided by present invention has good processability and can be used for producing rubber products with high aging resistance and compression set resistance.

Claims

1. A rubber composition, comprising a rubber matrix and essential components, wherein the rubber matrix comprises, based on 100 parts by weight of the rubber matrix, a branched polyethylene with a content represented as A, in which 0<A≤100 parts, and an ethylene-propylene rubber with a content represented as B, in which 0≤b<100 parts; and based on 100 parts by weight of the rubber matrix, the essential components comprise 1.5-10 parts of a crosslinking agent, 30-200 parts of a reinforcing filler, and 5-250 parts of a plasticizer, wherein the branched polyethylene comprises an ethylene homopolymer having a degree of branching of from 60 to 105 branches/1000 carbon atoms, a weight average molecular weight of from 268,000 to 518,000, and a Mooney viscosity ML(1+4) at 125° C. of from 42 to 102.

2. The rubber composition according to claim 1, wherein based on 100 parts by weight of the rubber matrix, the content of the branched polyethylene is A, in which 10≤A≤100 parts; said ethylene-propylene rubber is consisted of EPM and EPDM, and the content of EPM and EPDM is B, in which 0≤B≤90 parts, wherein the branched polyethylene is an ethylene homopolymer having a degree of branching of from 82 to 105 branches/1000 carbon atoms, a weight average molecular weight of from 268,000 to 401,000, and a Mooney viscosity ML(1+4) at 125° C. of from 42 to 101.

3. The rubber composition according to claim 1, comprising a rubber matrix and essential components, wherein the rubber matrix comprises, in parts by weight, 100 parts of a branched polyethylene; and based on 100 parts by weight of the rubber matrix, the essential components comprise 1.5-10 parts of a crosslinking agent, 30-200 parts of a reinforcing filler, and 8-150 parts of a plasticizer.

4. The rubber composition according to claim 1, wherein the crosslinking agent comprises at least one of a peroxide crosslinking agent and sulfur, wherein the peroxide crosslinking agent comprises at least one of di-tert-butyl peroxide, dicumyl peroxide, tert-butyl cumyl peroxide, 1,1-di-tert-butyl peroxide-3,3,5-trimethylcyclohexane, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexyne-3, bis(tert-butylperoxyisopropyl)benzene, 2,5-dimethyl-2,5-bis(benzoylperoxy)hexane, tert-butyl peroxybenzoate, and tert-butylperoxy-2-ethylhexyl carbonate; the reinforcing filler comprises at least one of carbon black, silica, calcium carbonate, talc, calcined clay, magnesium silicate, and magnesium carbonate; the plasticizer comprises at least one of pine tar, motor oil, naphthenic oil, paraffin oil, coumarone, RX-80, stearic acid, paraffin, and liquid polyisobutene.

5. The rubber composition according to claim 1, further comprising auxiliary components, which comprise, based on 100 parts by weight of the rubber matrix, 0.2 to 10 parts of an auxiliary crosslinking agent, 0.5 to 3 parts of a stabilizer, 2 to 15 parts of a metal oxide, and 0 to 3 parts of a vulcanization accelerator; the auxiliary crosslinking agent comprises at least one of triallyl cyanurate, triallyl isocyanurate, ethylene glycol dimethacrylate, ethyl dimethacrylate, triethylene glycol dimethacrylate, triallyl trimellitate, trimethylolpropane trimethacrylate, ethylene glycol dimethacrylate, N,N′-m-phenylene bismaleimide, N,N′-bis(furfurylidene) acetone, 1,2-polybutadiene, paraquinonedioxime, sulfur, and a metal salt of an unsaturated carboxylic acid; the metal oxide comprises at least one of zinc oxide, magnesia, calcium oxide, lead monoxide, and lead tetroxide; the stabilizer comprises at least one of 2,2,4-trimethyl-1,2-dihydroquinoline polymer, 6-ethoxy-2,2,4-trimethyl-1,2-dihydroquinoline, and 2-mercaptobenzimidazole; the vulcanization accelerator comprises at least one of 2-mercaptobenzothiazole, dibenzothiazyl disulfide, tetramethyl thiuram monosulfide, tetramethyl thiuram disulfide, tetraethyl thiuram disulfide, N-cyclohexyl-2-benzothiazole sulfenamide, N,N-dicyclohexyl-2-benzothiazole sulfenamide, bismaleimide, and ethylene thiourea.

6. A rubber support, wherein, a rubber compound used for the rubber support comprises a rubber composition comprising a rubber matrix and essential components, wherein the rubber matrix comprises, based on 100 parts by weight of the rubber matrix, a branched polyethylene with a content represented as A, in which 0<A≤100 parts, and an ethylene-propylene rubber with a content represented as B, in which 0≤B<100 parts; and based on 100 parts by weight of the rubber matrix, the essential components comprise 1.5-10 parts of a crosslinking agent, 30-200 parts of a reinforcing filler, and 5-250 parts of a plasticizer, wherein the branched polyethylene comprises an ethylene homopolymer having a degree of branching of not less than 50 branches/1000 carbon atoms, a weight average molecular weight of not less than 50,000, and a Mooney viscosity ML(1+4) at 125° C. of not less than 2; and wherein either: the rubber support is a plate-type rubber support of bridge and comprises a steel plate and a rubber sheet, wherein the rubber sheet comprises the rubber compound; the rubber support is a basin-type rubber support and comprises a rubber bearing plate comprising the rubber compound; or the rubber support is a vehicle shock-absorbing support.

7. An aging resistant rubber product, wherein, a rubber compound used for the aging resistant rubber product comprises a rubber composition comprising a rubber matrix and essential components, wherein the rubber matrix comprises, based on 100 parts by weight of the rubber matrix, a branched polyethylene with a content represented as A, in which 0<A≤100 parts, and an ethylene-propylene rubber with a content represented as B, in which 0≤B<100 parts; and based on 100 parts by weight of the rubber matrix, the essential components comprise 1.5-10 parts of a crosslinking agent, 30-200 parts of a reinforcing filler, and 5-250 parts of a plasticizer, wherein the branched polyethylene comprises an ethylene homopolymer having a degree of branching of not less than 50 branches/1000 carbon atoms, a weight average molecular weight of not less than 50,000, and a Mooney viscosity ML(1+4) at 125° C. of not less than 2.

8. The aging resistant rubber product according to claim 7, wherein, said aging resistant rubber product is a rubber expansion and contraction installation for bridge, which comprises a rubber expansion and contraction body, the rubber compound used for said rubber expansion and contraction body comprises said rubber composition.

9. The aging resistant rubber product according to claim 7, wherein, said aging resistant rubber product is a rubber and steel plate composite expansion and contraction installation, which comprises a rubber expansion and contraction body, the rubber compound used for said rubber expansion and contraction body comprises said rubber composition.

10. The aging resistant rubber product according to claim 7, wherein, said aging resistant rubber product is a rubber railway pad.

11. The aging resistant rubber product according to claim 7, wherein, said aging resistant rubber product is a rubber fender.

12. The aging resistant rubber product according to claim 7, wherein, said aging resistant rubber product is a rubber water stop.

13. The aging resistant rubber product according to claim 7, wherein, said aging resistant rubber product is a rubber roller.

14. The aging resistant rubber product according to claim 7, wherein, said aging resistant rubber product is a high temperature-resistant ribbed belt.

15. The aging resistant rubber product according to claim 7, wherein, said aging resistant rubber product is a windshield wiper.

16. The aging resistant rubber product according to claim 7, wherein, said aging resistant rubber product is a waterproof coil.

17. The aging resistant rubber product according to claim 7, wherein, said aging resistant rubber product is an inner tire.

18. The rubber composition according to claim 1, wherein the ethylene homopolymer has a degree of branching of from 60 to 102 branches/1000 carbon atoms.

19. The rubber composition according to claim 1, wherein the ethylene homopolymer has a degree of branching of from 82 to 102 branches/1000 carbon atoms.

Description

DETAILED DESCRIPTION

(1) The following examples are given to further illustrate the present invention, and not intended to limit the scope of the present invention. Some non-essential improvements and modifications made by the skilled person in the art based on the disclosure herein are still within the scope of the present invention.

(2) Specific embodiments of the rubber composition provided in the present invention are as follows.

(3) A rubber composition is provided, which comprises a rubber matrix and essential components. The rubber matrix comprises, in parts by weight, A parts of a branched polyethylene, in which 0<a≤100 parts, and B parts of an ethylene-propylene rubber, in which 0≤b<100 parts; and the essential components comprise 1.5-10 parts of a crosslinking agent, 30-200 parts of a reinforcing filler, and 5-250 parts of a plasticizer. The branched polyethylene has a degree of branching of not less than 50 branches/1000 carbon atoms, a weight average molecular weight of not less than 50,000, and a Mooney viscosity ML (1+4) at 125° C. of not less than 2.

(4) In a further preferred embodiment, the rubber composition comprises a rubber matrix and essential components. The rubber matrix comprises, in parts by weight, 100 parts of a branched polyethylene; and based on 100 parts by weight of the rubber matrix, the essential components comprise 2-7 parts of a crosslinking agent, 30-200 parts of a reinforcing filler, and 8-150 parts of a plasticizer.

(5) In this embodiment, the crosslinking agent includes at least one of a peroxide crosslinking agent and sulfur. The peroxide crosslinking agent includes at least one of di-tert-butyl peroxide, dicumyl peroxide, tert-butyl cumyl peroxide, 1,1-di-tert-butyl peroxide-3,3,5-trimethylcyclohexane, 2,5-di methyl-2,5-di(tert-butyl peroxy)hexane, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexyne-3, bis(tert-butylperoxyisopropyl)benzene, 2,5-dimethyl-2,5-bis(benzoylperoxy)hexane, tert-butyl peroxybenzoate, and tert-butylperoxy-2-ethylhexyl carbonate. The reinforcing filler comprises at least one of carbon black, silica, calcium carbonate, talc, calcined clay, magnesium silicate, and magnesium carbonate. The plasticizer comprises at least one of pine tar, motor oil, naphthenic oil, paraffin oil, coumarone, RX-80, stearic acid, paraffin, liquid polyisobutene, a fatty acid derivative, and a mixture thereof.

(6) The rubber composition further comprises auxiliary components, which comprise 0.2 to 10 parts of an auxiliary crosslinking agent, 0.5 to 3 parts of a stabilizer, 2 to 15 parts of a metal oxide, and 0 to 3 parts of a vulcanization accelerator. The auxiliary crosslinking agent comprises at least one of triallyl cyanurate, triallyl isocyanurate, ethylene glycol dimethacrylate, ethyl dimethacrylate, triethylene glycol dimethacrylate, triallyl trimellitate, trimethylolpropane trimethacrylate, ethylene glycol dimethacrylate, N,N′-m-phenylene bismaleimide, N,N′-bis(furfurylidene) acetone, 1,2-polybutadiene, paraquinonedioxime, sulfur, zinc acrylate, zinc methacrylate, magnesium methacrylate, calcium methacrylate, and aluminum methacrylate.

(7) The metal oxide includes at least one of zinc oxide, magnesia, calcium oxide, lead monoxide, and lead tetroxide.

(8) The stabilizer comprises at least one of 2,2,4-trimethyl-1,2-dihydroquinoline polymer (RD), 6-ethoxy-2,2,4-trimethyl-1,2-dihydroquinoline (AW), and 2-mercaptobenzimidazole (MB). The vulcanization accelerator comprises at least one of 2-mercaptobenzothiazole, dibenzothiazyl disulfide, tetramethyl thiuram monosulfide, tetramethyl thiuram di sulfide, tetraethyl thiuram di sulfide, N-cyclohexyl-2-benzothiazole sulfenamide, N,N-dicyclohexyl-2-benzothiazole sulfenamide, bismaleimide, and ethylene thiourea.

(9) The crosslinking system includes a crosslinking agent, and also at least one of an auxiliary crosslinking agent and a vulcanization accelerator.

(10) The EPM used preferably has a Mooney viscosity ML (1+4) at 125° C. of 20-50 and preferably has an ethylene content of 45%-60%.

(11) The EPDM used preferably has a Mooney viscosity ML (1+4) at 125° C. of 20 to 100 and further preferably 20 to 80, and preferably has an ethylene content of 50% to 75%. The third monomer is 5-ethylidene-2-norbornene, 5-vinyl-2-norbornene or dicyclopentadiene, and the content of the third monomer is 1%-7%.

(12) The branched polyethylene can be obtained by the catalytic homopolymerization of ethylene in the presence of an (α-diimine) nickel catalyst and a cocatalyst. The structure of the (α-diimine) nickel catalyst used, the synthesis method and the method for preparing branched polyethylene therewith are disclosed in the prior art, as described in, without limitation, CN102827312A, CN101812145A, CN101531725A, CN104926962A, U.S. Pat. Nos. 6,103,658, and 6,660,677.

(13) The branched polyethylene has a degree of branching of 60-130 branches/1000 carbon atoms, a weight average molecular weight of 66,000-518,000, and a Mooney viscosity ML (1+4) at 125° C. of 6-102. The degree of branching is measured by .sup.1H NMR, and the molar percentages of various branches are measured by .sup.13C NMR.

(14) The details are shown in a table below:

(15) TABLE-US-00001 Content Weight Mooney of hexyl average viscosity Branched Degree and molecular Molecular ML(1 + polyethylene of Methyl Ethyl Propyl Butyl Pentyl higher weight/ weight 4) No. branching content/% content/% content/% content/% content/% branches/% 10,000 distribution 125° C. PER-1 130 46.8 18.3 8.3 6.7 5.2 14.7 6.6 2.2 6 PER-2 116 51.2 17.6 8.2 5.8 5.1 12.1 20.1 2.1 23 PER-3 112 52.4 16.2 7.6 5.6 4.9 13.3 22.5 1.9 32 PER-4 105 54.0 13.7 6.4 5.3 5.1 15.5 26.8 2.1 42 PER-5 102 56.2 12.9 6.2 5.2 4.9 14.6 27.9 2.1 52 PER-6 99 59.6 11.6 5.8 4.9 5.1 13.0 28.3 1.8 63 PER-7 90 62.1 9.4 5.4 4.6 4.5 14.0 32.1 2.1 77 PER-8 82 64.2 8.7 5.3 4.2 3.9 13.7 35.6 1.7 80 PER-9 70 66.5 7.2 4.6 3.2 3.2 15.3 43.6 2.1 93 PER-10 60 68.1 7.1 4.2 2.7 2.8 15.1 51.8 2.2 102 PER-11 87 61.8 10.3 5.4 4.6 4.9 12.0 40.1 1.8 101 PER-12 94 60.5 10.8 5.7 4.7 4.9 13.3 37.8 2.0 85 PER-13 102 56.8 12.7 6.1 5.2 5.1 13.9 34.8 1.9 66

(16) Test Methods of Rubber Performances

(17) 1. Hardness test: The test is carried out using a hardness tester at room temperature in accordance with the national standard GB/T 531.1-2008.

(18) 2. Tensile strength and elongation at break performance test: The test is carried out with a type 2 dumbbell specimen using an electronic tensile tester at a tensile speed of 500 mm/min and a test temperature of 23±2° C. in accordance with the national standard GB/T528-2009.

(19) 3. Tear strength test: The test is carried out with a right-angled specimen using an electronic tensile tester at a tensile speed of 500 mm/min and a test temperature of 23±2° C. in accordance with the national standard GB/T529-2008.

(20) 4. Compression set resistance test: The test is carried out with a Type B specimen using a compression set tester in accordance with the national standard GB/T7759-1996, where the compression rate is 25%, and the test temperature is 70° C.

(21) 5. Mooney viscosity test: The test is carried out in accordance with the national standard GB/T1232.1-2000, with a Mooney viscosity meter at a test temperature of 125° C. by preheating for 1 minute, and the test is continued for 4 minutes.

(22) 6. Hot air accelerated aging test: The test is carried out in a heat aging test chamber at 150° C. for 72 h in accordance with the national standard GB/T3512-2001.

(23) 7. Test of optimum vulcanization time Tc90: The test is carried out at 160° C. in a rotorless vulcanizer in accordance with the national standard GB/T16584-1996.

(24) The vulcanization conditions in the following Examples 1 to 29 and Comparative Examples 1 and 6 include temperature: 160° C.; pressure: 16 MPa; and time Tc90+2 min.

(25) Some of the application areas in which the rubber composition provided in the present invention can be used will be disclosed in the following examples, and the properties of the vulcanized rubber produced with the rubber composition are tested and analyzed.

Example 1

(26) Branched polyethylene No. PER-6 was used.

(27) The processing steps of the rubber composition were as follows.

(28) (1) Mixing: The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 50 rpm. 50 parts of EPDM and 50 parts of branched polyethylene were added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide and 1 part of stearic acid were then added, and mixed for 1 min. Then 50 parts of carbon black N330, and 5 parts of paraffin oil SUNPAR2280 were added, and mixed for 3 min. Finally, 3 parts of the crosslinking agent dicumyl peroxide (DCP), 5 parts of the auxiliary crosslinking agent zinc methacrylate and 0.2 part of the auxiliary crosslinking agent sulfur were added, mixed for 2 min, and then discharged. The rubber mix was plasticated on an open mill with a roll temperature of 60° C. to obtain a sheet having a thickness of about 2.5 mm, which was stood for 20 hours.

(29) (2) After vulcanization, various tests were carried out after standing for 16 hrs.

(30) The rubber composition in this example can be used as a rubber compound for a rubber sheet of a plate-type support of bridge.

Example 2

(31) Branched polyethylene No. PER-6 was used.

(32) The processing steps of the rubber composition were as follows.

(33) (1) Mixing: The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 50 rpm. 100 parts of branched polyethylene was added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide and 1 part of stearic acid were added and mixed for 1 min. Then 50 parts of carbon black N330, and 5 parts of paraffin oil SUNPAR2280 were added, and mixed for 3 min. Finally, 3 parts of the crosslinking agent dicumyl peroxide (DCP), 5 parts of the auxiliary crosslinking agent zinc methacrylate and 0.2 part of the auxiliary crosslinking agent sulfur were added, mixed for 2 min, and then discharged. The rubber mix was plasticated on an open mill with a roll temperature of 60° C. to obtain a sheet having a thickness of about 2.5 mm, which was stood for 20 hours.

(34) (2) After vulcanization, various tests were carried out after standing for 16 hrs.

Comparative Example 1

(35) The processing steps were as follows.

(36) (1) Mixing: The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 50 rpm. 100 parts of EPDM was added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide and 1 part of stearic acid were then added, and mixed for 1 min. Then 50 parts of carbon black N330, and 5 parts of paraffin oil SUNPAR2280 were added, and mixed for 3 min. Finally, 3 parts of the crosslinking agent dicumyl peroxide (DCP), 5 parts of the auxiliary crosslinking agent zinc methacrylate and 0.2 part of the auxiliary crosslinking agent sulfur were added, mixed for 2 min, and then discharged. The rubber mix was plasticated on an open mill with a roll temperature of 60° C. to obtain a sheet having a thickness of about 2.5 mm, which was stood for 20 hours.

(37) (2) After vulcanization, various tests were carried out after standing for 16 hrs.

Example 3

(38) Branched polyethylene No. PER-5 was used.

(39) The processing steps of the rubber composition were as follows.

(40) (1) Mixing: The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 50 rpm. 70 parts of EPDM and 30 parts of branched polyethylene were added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide, and 1 part of stearic acid were then added, and mixed for 1 min. Then 65 parts of carbon black N330, and 5 parts of paraffin oil SUNPAR2280 were added, and mixed for 3 min. Finally, 3 parts of the crosslinking agent dicumyl peroxide (DCP) and 1 part of the auxiliary crosslinking agent triallyl isocyanurate (TAIC) were added, mixed for 2 min, and then discharged. The rubber mix was plasticated on an open mill with a roll temperature of 60° C. to obtain a sheet having a thickness of about 2.5 mm, which was stood for 20 hours.

(41) (2) After vulcanization, various tests were carried out after standing for 16 hrs.

Example 4

(42) Branched polyethylene No. PER-5 was used.

(43) The processing steps of the rubber composition were as follows.

(44) (1) Mixing: The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 50 rpm. 20 parts of EPM, 30 parts of EPDM and 50 parts of branched polyethylene were added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide, and 1 part of stearic acid were then added, and mixed for 1 min. Then 65 parts of carbon black N330, and 5 parts of paraffin oil SUNPAR2280 were added, and mixed for 3 min. Finally, 3 parts of the crosslinking agent dicumyl peroxide (DCP) and 1 part of the auxiliary crosslinking agent triallyl isocyanurate (TAIC) were added, mixed for 2 min, and then discharged. The rubber mix was plasticated on an open mill with a roll temperature of 60° C. to obtain a sheet having a thickness of about 2.5 mm, which was stood for 20 hours.

(45) (2) After vulcanization, various tests were carried out after standing for 16 hrs.

Example 5

(46) Branched polyethylene No. PER-5 was used.

(47) The processing steps of the rubber composition were as follows.

(48) (1) Mixing: The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 50 rpm. 30 parts of EPDM and 70 parts of branched polyethylene were added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide, and 1 part of stearic acid were then added, and mixed for 1 min. Then 65 parts of carbon black N330, and 5 parts of paraffin oil SUNPAR2280 were added, and mixed for 3 min. Finally, 3 parts of the crosslinking agent dicumyl peroxide (DCP) and 1 part of the auxiliary crosslinking agent triallyl isocyanurate (TAIC) were added, mixed for 2 min, and then discharged. The rubber mix was plasticated on an open mill with a roll temperature of 60° C. to obtain a sheet having a thickness of about 2.5 mm, which was stood for 20 hours.

(49) (2) After vulcanization, various tests were carried out after standing for 16 hrs.

Comparative Example 2

(50) EPDM was used as the rubber matrix.

(51) The processing steps were as follows.

(52) (1) Mixing: The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 50 rpm. 100 parts of EPDM were added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide, and 1 part of stearic acid were then added, and mixed for 1 min. Then 65 parts of carbon black N330, and 5 parts of paraffin oil SUNPAR2280 were added, and mixed for 3 min. Finally, 3 parts of the crosslinking agent dicumyl peroxide (DCP) and 1 part of the auxiliary crosslinking agent triallyl isocyanurate (TAIC) were added, mixed for 2 min, and then discharged. The rubber mix was plasticated on an open mill with a roll temperature of 60° C. to obtain a sheet having a thickness of about 2.5 mm, which was stood for 20 hours.

(53) (2) After vulcanization, various tests were carried out after standing for 16 hrs.

(54) The performance test data of Examples 1 to 5 and Comparative Examples 1 and 2 are shown in a table below.

(55) TABLE-US-00002 Comparative Comparative Test Item Example 1 Example 2 Example 1 Example 3 Example 4 Example 5 Example 2 Hardness 63 62 63 62 61 62 62 Tensile 21.8 23.1 19.3 18.9 19.7 21.8 17.5 strength/MPa Elongation at 421 432 392 493 489 511 502 break % Compression set 11 9 13 19 18 16 21 (at 70° C. for 22 h) After aging (at 150° C. for 72 h) Hardness 65 65 66 63 62 62 63 Retention rate of 106 104 107 107 106 106 109 tensile strength/% Retention rate of 96 96 95 92 94 95 92 elongation at break/%

Example 6

(56) A rubber expansion and contraction installation for bridge was produced by extrusion, which had a rubber expansion and contraction body with EPDM and branched polyethylene as the rubber matrix, in which the branched polyethylene used was PER-10.

(57) The rubber compound used in the rubber expansion and contraction body was processed through the following steps.

(58) (1) Mixing: The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 50 rpm. 90 parts of EPDM and 10 parts of branched polyethylene were added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide, 7 parts of calcium oxide and 1 part of stearic acid were then added, and mixed for 1 min. Then 90 parts of carbon black N550, 15 parts of calcium carbonate and 60 parts of paraffin oil SUNPAR2280 were added, and mixed for 3 min. Finally, 3 parts of the crosslinking agent dicumyl peroxide (DCP), and 0.3 part of the auxiliary crosslinking agent sulfur were added, mixed for 2 min, and then discharged. The rubber mix was plasticated on an open mill with a roll temperature of 60° C. to obtain a sheet having a thickness of about 2.5 mm, which was stood for 20 hours.

(59) (2) After vulcanization, various tests were carried out after standing for 16 hrs.

Example 7

(60) Branched polyethylene No. PER-9 was used.

(61) The processing steps of the rubber composition were as follows.

(62) (1) Mixing: The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 50 rpm. 90 parts of EPDM and 30 parts of branched polyethylene were added, prepressed and mixed for 70 seconds. 5 parts of zinc oxide, 7 parts of calcium oxide and 1 part of stearic acid were then added, and mixed for 1 min. Then 90 parts of carbon black N550, 15 parts of calcium carbonate and 60 parts of paraffin oil SUNPAR2280 were added, and mixed for 3 min. Finally, 3 parts of the crosslinking agent dicumyl peroxide (DCP), and 0.3 part of the auxiliary crosslinking agent sulfur were added, mixed for 2 min, and then discharged. The rubber mix was plasticated on an open mill with a roll temperature of 60° C. to obtain a sheet having a thickness of about 2.5 mm, which was stood for 20 hours.

(63) (2) After vulcanization, various tests were carried out after standing for 16 hrs.

Example 8

(64) Branched polyethylene No. PER-5 was used.

(65) The processing steps of the rubber composition were as follows.

(66) (1) Mixing: The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 50 rpm. 100 parts of branched polyethylene was added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide, 7 parts of calcium oxide and 1 part of stearic acid were then added, and mixed for 1 min. Then 90 parts of carbon black N550, 15 parts of calcium carbonate and 60 parts of paraffin oil SUNPAR2280 were added, and mixed for 3 min. Finally, 3 parts of the crosslinking agent dicumyl peroxide (DCP), and 0.3 part of the auxiliary crosslinking agent sulfur were added, mixed for 2 min, and then discharged. The rubber mix was plasticated on an open mill with a roll temperature of 60° C. to obtain a sheet having a thickness of about 2.5 mm, which was stood for 20 hours.

(67) (2) After vulcanization, various tests were carried out after standing for 16 hrs.

Comparative Example 3

(68) The processing steps were as follows.

(69) (1) Mixing: The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 50 rpm. 100 parts of EPDM was added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide, 7 parts of calcium oxide and 1 part of stearic acid were then added, and mixed for 1 min. Then 90 parts of carbon black N550, 15 parts of calcium carbonate and 60 parts of paraffin oil SUNPAR2280 were added, and mixed for 3 min. Finally, 3 parts of the crosslinking agent dicumyl peroxide (DCP), and 0.3 part of the auxiliary crosslinking agent sulfur were added, mixed for 2 min, and then discharged. The rubber mix was plasticated on an open mill with a roll temperature of 60° C. to obtain a sheet having a thickness of about 2.5 mm, which was stood for 20 hours.

(70) (2) After vulcanization, various tests were carried out after standing for 16 hrs.

Example 9

(71) Branched polyethylene No. PER-4 was used.

(72) The processing steps of the rubber composition were as follows.

(73) (1) Mixing: The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 40 rpm. 80 parts of EPDM and 20 parts of branched polyethylene were added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide, 1 part of stearic acid, and 2 parts of the anti-aging agent 2,2,4-trimethyl-1,2-dihydroquinoline polymer (RD) were then added, and mixed for 1 min. Then 50 parts of carbon black N330, 10 parts of calcium carbonate, 5 parts of paraffin oil SUNPAR2280, and 4 parts of coumarone resin were added, and mixed for 3 min. Finally, 3 parts of the crosslinking agent dicumyl peroxide (DCP), and 0.3 part of the auxiliary crosslinking agent sulfur were added, mixed for 2 min, and then discharged. The rubber mix was plasticated on an open mill with a roll temperature of 60° C. to obtain a sheet having a thickness of about 2.5 mm, which was stood for 20 hours.

(74) (2) After vulcanization, various tests were carried out after standing for 16 hrs.

Example 10

(75) Branched polyethylene No. PER-4 was used.

(76) The processing steps of the rubber composition were as follows.

(77) (1) Mixing: The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 40 rpm. 50 parts of EPDM and 50 parts of branched polyethylene were added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide, 1 part of stearic acid, and 2 parts of the anti-aging agent RD were then added, and mixed for 1 min. 50 parts of carbon black N330, 10 parts of calcium carbonate, 5 parts of paraffin oil SUNPAR2280, and 4 parts of coumarone resin were added and mixed for 3 min. Finally, 3 parts of the crosslinking agent dicumyl peroxide (DCP), and 0.3 part of the auxiliary crosslinking agent sulfur were added, mixed for 2 min, and then discharged. The rubber mix was plasticated on an open mill with a roll temperature of 60° C. to obtain a sheet having a thickness of about 2.5 mm, which was stood for 20 hours.

(78) (2) After vulcanization, various tests were carried out after standing for 16 hrs.

Example 11

(79) Branched polyethylene No. PER-4 was used.

(80) The processing steps of the rubber composition were as follows.

(81) (1) Mixing: The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 40 rpm. 100 parts of branched polyethylene were added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide, 1 part of stearic acid, and 2 parts of the anti-aging agent RD were then added, and mixed for 1 min. 50 parts of carbon black N330, 10 parts of calcium carbonate, 5 parts of paraffin oil SUNPAR2280, and 4 parts of coumarone resin were added and mixed for 3 min. Finally, 3 parts of the crosslinking agent dicumyl peroxide (DCP), and 0.3 part of the auxiliary crosslinking agent sulfur were added, mixed for 2 min, and then discharged. The rubber mix was plasticated on an open mill with a roll temperature of 60° C. to obtain a sheet having a thickness of about 2.5 mm, which was stood for 20 hours.

(82) (2) After vulcanization, various tests were carried out after standing for 16 hrs.

Example 12

(83) Branched polyethylene Nos. PER-1 and PER-7 were used.

(84) The processing steps of the rubber composition were as follows.

(85) (1) Mixing: The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 40 rpm. 30 parts of PER-1 and 70 parts of PER-7 were added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide, 1 part of stearic acid, and 2 parts of the anti-aging agent RD were then added, and mixed for 1 min. 50 parts of carbon black N330, 10 parts of calcium carbonate, 5 parts of paraffin oil SUNPAR2280, and 4 parts of coumarone resin were added and mixed for 3 min. Finally, 3 parts of the crosslinking agent dicumyl peroxide (DCP), and 0.3 part of the auxiliary crosslinking agent sulfur were added, mixed for 2 min, and then discharged. The rubber mix was plasticated on an open mill with a roll temperature of 60° C. to obtain a sheet having a thickness of about 2.5 mm, which was stood for 20 hours.

(86) (2) After vulcanization, various tests were carried out after standing for 16 hrs.

Comparative Example 4

(87) The processing steps were as follows.

(88) (1) Mixing: The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 40 rpm. 100 parts of EPDM was added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide, 1 part of stearic acid, and 2 parts of the anti-aging agent RD were then added, and mixed for 1 min. 50 parts of carbon black N330, 10 parts of calcium carbonate, 5 parts of paraffin oil SUNPAR2280, and 4 parts of coumarone resin were added and mixed for 3 min. Finally, 3 parts of the crosslinking agent dicumyl peroxide (DCP), and 0.3 part of the auxiliary crosslinking agent sulfur were added, mixed for 2 min, and then discharged. The rubber mix was plasticated on an open mill with a roll temperature of 60° C. to obtain a sheet having a thickness of about 2.5 mm, which was stood for 20 hours.

(89) (2) After vulcanization, various tests were carried out after standing for 16 hrs.

(90) The performance test data of Examples 6 to 12 and Comparative Examples 3 and 4 are shown in a table below.

(91) TABLE-US-00003 Comparative Example Example Example Comparative Test Item Example 6 Example 7 Example 8 Example 3 Example 9 10 11 12 Example 4 Hardness 64 63 61 63 58 59 59 60 58 Tensile 16.2 16.9 18.8 14.8 17.4 18.2 19.6 19.3 16.3 strength/MPa Elongation at 469 522 528 532 548 519 533 527 566 break % Compression 12 11 9 12 18 16 13 15 19 set (at 70° C. for 22 h) After aging (at 150° C. for 72 h) Hardness 65 63 63 64 61 61 61 62 60 Retention 96 96 97 97 107 105 103 104 106 rate of tensile strength/% Retention 90 91 92 91 93 92 94 93 92 rate of elongation at break/%

Example 13

(92) Branched polyethylene No. PER-8 was used.

(93) The processing steps of the rubber composition were as follows.

(94) (1) Mixing: The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 40 rpm. 50 parts of EPDM and 50 parts of branched polyethylene were added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide and 1 part of stearic acid were then added, and mixed for 1 min. Then 75 parts of carbon black N330, and 20 parts of hydrogenated rosin were added, and mixed for 3 min. Finally, 3.5 parts of the crosslinking agent dicumyl peroxide (DCP), 3 parts of N,N′-m-phenylene bismaleimide and 1 part of the auxiliary crosslinking agent paraquinonedioxime were added, mixed for 2 min, and then discharged. The rubber mix was plasticated on an open mill with a roll temperature of 60° C. to obtain a sheet having a thickness of about 2.5 mm, which was stood for 20 hours.

(95) (2) After vulcanization, various tests were carried out after standing for 16 hrs.

(96) The rubber composition can be used to produce a rubber railway pad.

Example 14

(97) Branched polyethylene Nos. PER-2 and PER-8 were used.

(98) The processing steps of the rubber composition were as follows.

(99) (1) Mixing: The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 40 rpm. 80 parts of PER-8 and 20 parts of PER-2 were added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide and 1 part of stearic acid were then added, and mixed for 1 min. Then 75 parts of carbon black N330, and 20 parts of hydrogenated rosin were added, and mixed for 3 min. Finally, 3.5 parts of the crosslinking agent dicumyl peroxide (DCP), 3 parts of 3 parts of N,N′-m-phenylene bismaleimide and 1 part of the auxiliary crosslinking agent paraquinonedioxime were added, mixed for 2 min, and then discharged. The rubber mix was plasticated on an open mill with a roll temperature of 60° C. to obtain a sheet having a thickness of about 2.5 mm, which was stood for 20 hours.

(100) (2) After vulcanization, various tests were carried out after standing for 16 hrs.

Comparative Example 5

(101) The processing steps were as follows.

(102) (1) Mixing: The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 40 rpm. 100 parts of EPDM was added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide and 1 part of stearic acid were then added, and mixed for 1 min. Then 75 parts of carbon black N330, and 20 parts of hydrogenated rosin were added, and mixed for 3 min. Finally, 3.5 parts of the crosslinking agent dicumyl peroxide (DCP), 3 parts of 3 parts of N,N′-m-phenylene bismaleimide and 1 part of the auxiliary crosslinking agent paraquinonedioxime were added, mixed for 2 min, and then discharged. The rubber mix was plasticated on an open mill with a roll temperature of 60° C. to obtain a sheet having a thickness of about 2.5 mm, which was stood for 20 hours.

(103) (2) After vulcanization, various tests were carried out after standing for 16 hrs.

Example 15

(104) Branched polyethylene No. PER-7 was used.

(105) The processing steps of the rubber composition were as follows.

(106) (1) Mixing: The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 40 rpm. 100 parts of branched polyethylene were added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide, and 1 part of stearic acid were then added, and mixed for 1 min. Then 125 parts of carbon black N330, 80 parts of paraffin oil SUNPAR2280, and 5 parts of polyethylene wax were added, and mixed for 3 min. Finally, 4 parts of the crosslinking agent dicumyl peroxide (DCP) and 1 part of the auxiliary crosslinking agent triallyl isocyanurate (TAIC) were added, mixed for 2 min, and then discharged. The rubber mix was plasticated on an open mill with a roll temperature of 60° C. to obtain a sheet having a thickness of about 2.5 mm, which was stood for 20 hours.

(107) (2) After vulcanization, various tests were carried out after standing for 16 hrs.

Example 16

(108) Branched polyethylene No. PER-4 was used.

(109) The processing steps of the rubber composition were as follows.

(110) (1) Mixing: The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 40 rpm. 100 parts of branched polyethylene was added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide and 1 part of stearic acid were added and mixed for 1 min. Then 45 parts of carbon black N330, 5 parts of paraffin oil SUNPAR2280, and 3 parts of coumarone resin were added, and mixed for 3 min. Finally, 3 parts of the crosslinking agent dicumyl peroxide (DCP), 1 part of the auxiliary crosslinking agent triallyl isocyanurate (TAIC) and 0.3 part of the auxiliary crosslinking agent sulfur were added, mixed for 2 min, and then discharged. The rubber mix was plasticated on an open mill with a roll temperature of 60° C. to obtain a sheet having a thickness of about 2.5 mm, which was stood for 20 hours.

(111) (2) After vulcanization, various tests were carried out after standing for 16 hrs.

Example 17

(112) Branched polyethylene No. PER-6 was used.

(113) The processing steps of the rubber composition were as follows.

(114) (1) Mixing: The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 40 rpm. 100 parts of branched polyethylene was added, prepressed and mixed for 90 seconds. 10 parts of zinc oxide, 1 part of the anti-aging agent RD and 1 part of stearic acid were added and mixed for 1 min. Then 80 parts of carbon black N550, and 100 parts of paraffin oil SUNPAR2280 were added, and mixed for 3 min. Finally, 3 parts of the crosslinking agent dicumyl peroxide (DCP), 0.5 part of N-cyclohexyl-2-benzothiazole sulfenamide (CZ), 1.25 parts of tetramethyl thiuram disulfide (TT) and 0.3 part of the auxiliary crosslinking agent sulfur were added, mixed for 2 min, and then discharged. The rubber mix was plasticated on an open mill with a roll temperature of 60° C. to obtain a sheet having a thickness of about 2.5 mm, which was stood for 20 hours.

(115) (2) After vulcanization, various tests were carried out after standing for 16 hrs.

Example 18

(116) Branched polyethylene No. PER-6 was used.

(117) The processing steps of the rubber composition were as follows.

(118) (1) Mixing: The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 40 rpm. 100 parts of branched polyethylene was added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide and 1 part of stearic acid were added and mixed for 1 min. Then 65 parts of carbon black N330, and 45 parts of paraffin oil SUNPAR2280 were added, and mixed for 3 min. Finally, 3 parts of the crosslinking agent dicumyl peroxide (DCP), and 2 parts of the auxiliary crosslinking agent ethylene glycol dimethacrylate were added, mixed for 2 min, and then discharged. The rubber mix was plasticated on an open mill with a roll temperature of 60° C. to obtain a sheet having a thickness of about 2.5 mm, which was stood for 20 hours.

(119) (2) After vulcanization, various tests were carried out after standing for 16 hrs.

Example 19

(120) Branched polyethylene No. PER-3 was used.

(121) The processing steps of the rubber composition were as follows.

(122) (1) Mixing: The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 40 rpm. 100 parts of branched polyethylene was added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide and 1 part of stearic acid were then added, and mixed for 1 min. Then 60 parts of carbon black N550, 80 parts of calcium carbonate and 120 parts of paraffin oil SUNPAR2280 were added, and mixed for 3 min. Finally, 1 part of the crosslinking agent dicumyl peroxide (DCP), 0.3 part of the auxiliary crosslinking agent triallyl isocyanurate (TAIC), 0.5 part of the crosslinking agent sulfur, 1 part of N-cyclohexyl-2-benzothiazole sulfenamide (CZ), and 0.8 part of tetramethyl thiuram disulfide (TMTD) were added, mixed for 2 min, and then discharged. The rubber mix was plasticated on an open mill with a roll temperature of 60° C. to obtain a sheet having a thickness of about 2.5 mm, which was stood for 20 hours.

(123) (2) After vulcanization, various tests were carried out after standing for 16 hrs.

Example 20

(124) Branched polyethylene No. PER-5 was used.

(125) The processing steps of the rubber composition were as follows.

(126) (1) Mixing: The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 40 rpm. 100 parts of branched polyethylene was added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide and 1 part of stearic acid were added and mixed for 1 min. Then 50 parts of carbon black N330, 60 parts of carbon black N550, and 240 parts of paraffin oil SUNPAR2280 were added, and mixed for 3 min. Finally, 8 parts of the crosslinking agent dicumyl peroxide (DCP), 2 parts of the auxiliary crosslinking agent triallyl isocyanurate (TAIC) and 8 parts of the auxiliary crosslinking agent 1,2-polybutadiene were added, mixed for 2 min, and then discharged. The rubber mix was plasticated on an open mill with a roll temperature of 60° C. to obtain a sheet having a thickness of about 2.5 mm, which was stood for 20 hours.

(127) (2) After vulcanization, various tests were carried out after standing for 16 hrs.

(128) The performance test data of Examples 13 to 20 and Comparative Examples 1 and 5 are shown in a table below.

(129) TABLE-US-00004 Example Example Comparative Example Example Example Example Example Example Test Item 13 14 Example 5 15 16 17 18 19 20 Hardness 76 75 78 72 60 52 59 41 42 Tensile 22.8 23.7 20.9 21.9 19.6 21.3 17.6 8.9 7.3 strength/MPa Elongation at 337 329 322 359 521 549 496 687 672 break % Compression set 14 14 15 12 15 10 9 22 25 (at 70° C. for 22 h) After aging (at 150° C. for 72 h) Hardness 78 78 82 73 62 54 61 44 46 Retention rate of 103 104 105 96 105 96 97 78 82 tensile strength/% Retention rate of 96 95 94 94 94 93 95 68 94 elongation at break/%

Example 21

(130) Branched polyethylene No. PER-4 was used.

(131) The processing steps of the rubber composition were as follows.

(132) (1) Mixing: The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 40 rpm. 100 parts of branched polyethylene and 1 part of stearic acid were added, prepressed and mixed for 90 seconds. Then 30 parts of carbon black N550, and 5 parts of paraffin oil SUNPAR2280 were added, and mixed for 3 min. Finally, 4 parts of the crosslinking agent dicumyl peroxide (DCP) was added, mixed for 2 min, and then discharged. The rubber mix was plasticated on an open mill with a roll temperature of 60° C. to obtain a sheet having a thickness of about 2.5 mm, which was stood for 20 hours.

(133) (2) After vulcanization, various tests were carried out after standing for 16 hrs.

Example 22

(134) Branched polyethylene No. PER-4 was used.

(135) The processing steps of the rubber composition were as follows.

(136) (1) Mixing: The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 40 rpm. 100 parts of branched polyethylene was added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide and 1 part of stearic acid were added and mixed for 1 min. Then 120 parts of carbon black N550, 80 parts of calcium carbonate, and 180 parts of paraffin oil SUNPAR2280 were added, and mixed for 3 min. Finally, 10 parts of the crosslinking agent dicumyl peroxide (DCP), 3 parts of the auxiliary crosslinking agent triallyl isocyanurate (TAIC) and 7 parts of the auxiliary crosslinking agent 1,2-polybutadiene were added, mixed for 2 min, and then discharged. The rubber mix was plasticated on an open mill with a roll temperature of 60° C. to obtain a sheet having a thickness of about 2.5 mm, which was stood for 20 hours.

(137) (2) After vulcanization, various tests were carried out after standing for 16 hrs.

Example 23

(138) Branched polyethylene No. PER-7 was used.

(139) The processing steps of the rubber composition were as follows.

(140) (1) Mixing: The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 40 rpm. 100 parts of branched polyethylene was added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide and 1 part of stearic acid were added and mixed for 1 min. Then 30 parts of carbon black N330, 50 parts of carbon black N550 and 5 parts of paraffin oil SUNPAR2280 were added, and mixed for 3 min. Finally, 3.5 parts of the crosslinking agent dicumyl peroxide (DCP) was added, mixed for 2 min, and then discharged. The rubber mix was plasticated on an open mill with a roll temperature of 60° C. to obtain a sheet having a thickness of about 2.5 mm, which was stood for 20 hours.

(141) (2) After vulcanization, various tests were carried out after standing for 16 hrs.

Example 24

(142) Branched polyethylene No. PER-6 was used.

(143) The processing steps were as follows. (1) Mixing: The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 40 rpm. 100 parts of branched polyethylene was added, prepressed and mixed for 90 seconds. 6 parts of zinc oxide, 2 parts of the anti-aging agent RD and 1 part of stearic acid were added and mixed for 1 min. Then 55 parts of carbon black N330, 5 parts of paraffin oil SUNPAR2280, and 5 parts of coumarone resin were added, and mixed for 3 min. Finally, 4 parts of the crosslinking agent dicumyl peroxide (DCP), 1.5 parts of the auxiliary crosslinking agent triallyl isocyanurate (TAIC), 8 parts of the auxiliary crosslinking agent zinc methacrylate and 0.3 part of the auxiliary crosslinking agent sulfur were added, mixed for 2 min, and then discharged. The rubber mix was plasticated on an open mill with a roll temperature of 60° C. to obtain a sheet having a thickness of about 2.5 mm, which was stood for 20 hours.

(144) (2) After vulcanization, various tests were carried out after standing for 16 hrs.

Example 25

(145) Branched polyethylene No. PER-5 was used.

(146) The processing steps were as follows.

(147) (1) Mixing: The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 40 rpm. 100 parts of branched polyethylene was added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide and 1 part of stearic acid were added and mixed for 1 min. Then 100 parts of carbon black N550, and 75 parts of paraffin oil SUNPAR2280 were added, and mixed for 3 min. Finally, 2 parts of the crosslinking agent dicumyl peroxide (DCP), 1 part of the auxiliary crosslinking agent triallyl isocyanurate (TAIC) and 0.2 parts of the auxiliary crosslinking agent sulfur were added, mixed for 2 min, and then discharged. The rubber mix was plasticated on an open mill with a roll temperature of 60° C. to obtain a sheet having a thickness of about 2.5 mm, which was stood for 20 hours.

(148) (2) After vulcanization, various tests were carried out after standing for 16 hrs.

Example 26

(149) Branched polyethylene No. PER-4 was used.

(150) The processing steps were as follows.

(151) (1) Mixing: The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 40 rpm. 100 parts of branched polyethylene was added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide and 1 part of stearic acid were added and mixed for 1 min. Then 50 parts of carbon black N550, and 5 parts of polyethylene wax were added, and mixed for 3 min. Finally, 3.5 parts of the crosslinking agent dicumyl peroxide (DCP), and 1 part of the auxiliary crosslinking agent triallyl isocyanurate (TAIC) were added, mixed for 2 min, and then discharged. The rubber mix was plasticated on an open mill with a roll temperature of 60° C. to obtain a sheet having a thickness of about 2.5 mm, which was stood for 20 hours.

(152) (2) After vulcanization, various tests were carried out after standing for 16 hrs.

(153) The performance test data of Examples 21 to 26 are shown in a table below.

(154) TABLE-US-00005 Example Example Example Example Example Example Test Item 21 22 23 24 25 26 Hardness 55 61 80 73 62 70 Tensile strength/MPa 13.7 12.2 21.8 16.7 13.9 17.4 Elongation at break % 547 481 276 332 413 489 Compression set (at 70° C. for 16 17 24 14 12 10 22 h) After aging (at 150° C. for 72 h) Hardness 57 64 82 74 65 72 Retention rate of tensile 92 88 89 113 108 106 strength/% Retention rate of elongation 85 83 82 94 95 92 at break/%

Example 27

(155) Branched polyethylene No. PER-5 was used.

(156) The processing steps were as follows.

(157) (1) Mixing: The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 40 rpm. 100 parts of branched polyethylene was added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide and 1 part of stearic acid were added and mixed for 1 min. Then 70 parts of carbon black N330, 30 parts of carbon black N550, 40 parts of paraffin oil SUNPAR2280, and 5 parts of coumarone resin were added, and mixed for 3 min. Finally, 4 parts of the crosslinking agent dicumyl peroxide (DCP), 1 part of the auxiliary crosslinking agent triallyl isocyanurate (TAIC) and 0.3 part of the auxiliary crosslinking agent sulfur were added, mixed for 2 min, and then discharged. The rubber mix was plasticated on an open mill with a roll temperature of 60° C. to obtain a sheet having a thickness of about 2.5 mm, which was stood for 20 hours.

(158) (2) After vulcanization, various tests were carried out after standing for 16 hrs.

Example 28

(159) Branched polyethylene No. PER-5 was used.

(160) The processing steps were as follows.

(161) (1) Mixing: The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 40 rpm. 100 parts of branched polyethylene was added, prepressed and mixed for 90 seconds. Then 120 parts of carbon black N330, 30 parts of talc, and 105 parts of paraffin oil SUNPAR2280 were added, and mixed for 3 min. Finally, 5 parts of the crosslinking agent dicumyl peroxide (DCP) and 2 parts of the auxiliary crosslinking agent triallyl isocyanurate (TAIC) were added, mixed for 2 min, and then discharged. The rubber mix was plasticated on an open mill with a roll temperature of 60° C. to obtain a sheet having a thickness of about 2.5 mm, which was stood for 20 hours.

(162) (2) After vulcanization, various tests were carried out after standing for 16 hrs.

Comparative Example 6

(163) The processing steps were as follows.

(164) (1) Mixing: The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 40 rpm. 100 parts of EPDM was added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide and 1 part of stearic acid were added and mixed for 1 min. Then 70 parts of carbon black N330, 30 parts of carbon black N550, 40 parts of paraffin oil SUNPAR2280, and 5 parts of coumarone resin were added, and mixed for 3 min. Finally, 4 parts of the crosslinking agent dicumyl peroxide (DCP), 1 part of the auxiliary crosslinking agent triallyl isocyanurate (TAIC) and 0.3 part of the auxiliary crosslinking agent sulfur were added, mixed for 2 min, and then discharged. The rubber mix was plasticated on an open mill with a roll temperature of 60° C. to obtain a sheet having a thickness of about 2.5 mm, which was stood for 20 hours.

(165) (2) After vulcanization, various tests were carried out after standing for 16 hrs.

(166) The performance test data of Examples 27 and 28 and Comparative Example 6 are shown in a table below.

(167) TABLE-US-00006 Example Example Comparative Test Item 27 28 Example 6 Hardness 63 62 62 Tensile strength/MPa 13.6 14.9 11.6 Elongation at break % 528 411 560 Tear strength N/mm 34.1 37.8 28 After aging (at 150° C. for 72 h) Hardness 65 64 64 Retention rate of tensile strength/% 103 108 112 Retention rate of elongation at 89 92 87 break/%

Example 29

(168) Branched polyethylene No. PER-4 was used.

(169) The processing steps were as follows.

(170) (1) Mixing: The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 40 rpm. 100 parts of branched polyethylene was added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide and 1 part of stearic acid were added and mixed for 1 min. Then 40 parts of carbon black N330, 60 parts of barium sulfate, 10 parts of paraffin oil SUNPAR2280, and 8 parts of polyethylene wax were added, and mixed for 3 min. Finally, 7 parts of the crosslinking agent dicumyl peroxide (DCP) was added, mixed for 2 min, and then discharged. The rubber mix was plasticated on an open mill with a roll temperature of 60° C. to obtain a sheet having a thickness of about 2.5 mm, which was stood for 20 hours.

(171) (2) After vulcanization, various tests were carried out after standing for 16 hrs.

(172) The present invention also provides various use of the rubber composition in the production of rubber expansion and contraction installations for bridge, rubber railway pads, plate-type rubber supports of bridge, basin-type rubber supports of bridge, rubber/steel plate composite expansion and contraction installations, rubber fenders, rubber water stops, vehicle shock-absorbing supports, rubber rollers, high-temperature resistant ribbed belts, windshield wipers, sealing rings, waterproof coils, and others. Specific examples are provided below.

Example 30

(173) A plate-type rubber support of bridge was produced through the following steps.

(174) The plate-type rubber support of bridge comprises a steel plate and a rubber sheet, where the rubber sheet and the steel plate are bonded together as a whole by coating an adhesive, pressing and vulcanizing, and the components in the rubber composition used in the rubber sheet in this example are weighed and mixed according to the formulation and mixing ratio shown in Example 2.

(175) (1) Rubber mixing process: The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 50 rpm. 100 parts of branched polyethylene was added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide and 1 part of stearic acid were added and mixed for 1 min. Then 50 parts of carbon black N330, and 5 parts of paraffin oil SUNPAR2280 were added, and mixed for 3 min. Finally, 3 parts of the crosslinking agent dicumyl peroxide (DCP), 5 parts of the auxiliary crosslinking agent zinc methacrylate and 0.2 part of the auxiliary crosslinking agent sulfur were added, mixed for 2 min, and then discharged. The rubber mix was plasticated on an open mill, and the sheet was unloaded, stood and inspected. The sheet was numbered, remilled, calendered, discharged and punched into a semi-finished rubber sheet of desired specification for use in the vulcanization procedure.

(176) (2) Vulcanization process: The rubber sheet, and a steel plate that was surface treated and coated with an adhesive were sequentially laminated according to the process requirements, then filled into a preheated mold, and vulcanized for 25 min on a press vulcanizer at a vulcanization temperature of 160° C., under a steam pressure of 0.6 MPa.

(177) (3) Post-treatment: After vulcanization, the mold was pulled out and disassembled, and the finished rubber support product was removed, cooled, stood and trimmed to obtain the finished product.

Example 31

(178) A plate-type rubber support of bridge was produced through the following steps.

(179) The plate-type rubber support of bridge comprises a steel plate, a polytetrafluoroethylene plate and a rubber sheet, where the rubber sheet, the polytetrafluoroethylene plate and the steel plate are bonded together as a whole by coating an adhesive, pressing and vulcanizing. The components in the rubber composition used in the rubber sheet in this example are weighed and mixed according to the formulation and mixing ratio shown in Example 2.

(180) (1) Rubber mixing process: The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 50 rpm. 100 parts of branched polyethylene PER-6 was added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide and 1 part of stearic acid were added and mixed for 1 min. Then 50 parts of carbon black N330, and 5 parts of paraffin oil SUNPAR2280 were added, and mixed for 3 min. Finally, 3 parts of the crosslinking agent dicumyl peroxide (DCP), 5 parts of the auxiliary crosslinking agent zinc methacrylate and 0.2 part of the auxiliary crosslinking agent sulfur were added, mixed for 2 min, and then discharged. The rubber mix was plasticated on an open mill, and the sheet was unloaded, stood and inspected. The sheet was numbered, remilled, calendered, discharged and punched into a semi-finished rubber sheet of desired specification for use in the vulcanization procedure.

(181) (2) Vulcanization process: The rubber sheet, and the steel plate and the polytetrafluoroethylene plate that were surface treated and coated with an adhesive were sequentially laminated according to the process requirements, then filled into a preheated mold, and vulcanized for 25 min on a press vulcanizer at a vulcanization temperature of 160° C., under a steam pressure of 0.6 MPa.

(182) (3) Post-treatment: After vulcanization, the mold was pulled out and disassembled, and the finished rubber support product was removed, cooled, stood and trimmed to obtain a plate-type rubber support for simply-supported long-span bridge.

Example 32

(183) The basin-type rubber support in this example comprises an upper support plate, a stainless steel plate, a polytetrafluoroethylene plate, an intermediate steel plate, a sealing ring, a rubber bearing plate, a lower support plate, and an anchor of the support. The rubber bearing plate in this example had the same rubber composition as that in Example 5, and was produced through the following steps:

(184) (1) Rubber mixing process: The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 50 rpm. 30 parts of EPDM and 70 parts of branched polyethylene PER-5 were added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide and 1 part of stearic acid were added and mixed for 1 min. Then 65 parts of carbon black N330 and 5 parts of paraffin oil SUNPAR2280 were added, and mixed for 3 min. Finally, 3 parts of the crosslinking agent dicumyl peroxide (DCP) and 1 part of the auxiliary crosslinking agent triallyl isocyanurate (TAIC) were added, mixed for 2 min, and then discharged. The rubber mix was plasticated on an open mill, and the sheet was unloaded, stood, and inspected.

(185) (2) Vulcanization process: Molding vulcanization was adopted, where the vulcanization temperature was 160° C., the steam pressure was 0.6 MPa, and the vulcanization time was 25 minutes.

(186) (3) The sheet was cooled, stood, and trimmed to obtain a rubber bearing plate.

(187) The rubber bearing plate was assembled with other components, to obtain a basin-type rubber support.

Example 33

(188) A rubber expansion and contraction body of a rubber expansion and contraction installation for bridge was produced through an extrusion method comprising specifically the following steps.

(189) (1) Mixing: The rubber expansion and contraction body in this example was produced with the rubber composition of Example 8. The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 50 rpm. 100 parts of branched polyethylene PER-5 was added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide, 7 parts of calcium oxide and 1 part of stearic acid were added and mixed for 1 min. Then 90 parts of carbon black N550, 15 parts of calcium carbonate, and 60 parts of paraffin oil SUNPAR2280 were added, and mixed for 3 min. Finally, 3 parts of the crosslinking agent dicumyl peroxide (DCP), and 0.3 parts of the auxiliary crosslinking agent sulfur were added, mixed for 2 min, and then discharged. The rubber mix was plasticated on an open mill, and the sheet was unloaded, stood and inspected.

(190) (2) Extrusion and vulcanization: The extrusion and vulcanization process was carried out using an evacuation extruder. The temperature of the extruder was set such that the head temperature was 90-100° C., and the screw temperature was 70-80° C., the head pressure was controlled to 15-20 MPa, and the rotation speed of the extruder was 25-30 rpm. A salt bath vulcanization process was employed, where the temperature in the spray section was 250° C., the temperature in the deeping section was 220° C., the temperature in the deeping pressing section was 220° C., the transmission speed was 35-45 m/min, and the temperature in the cooling section was 25-30° C.

(191) (3) After cooling, trimming, and inspecting, a finished product was obtained.

Example 34

(192) A rubber expansion and contraction body of a rubber expansion and contraction installation for bridge was produced through a molding method comprising specifically the following steps.

(193) (1) Mixing: The rubber expansion and contraction body in this example was produced with the rubber composition of Example 11. The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 40 rpm. 100 parts of branched polyethylene PER-4 was added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide, 2 parts of calcium oxide and 1 part of stearic acid were added and mixed for 1 min. Then 50 parts of carbon black N330, 10 parts of calcium carbonate, 5 parts of paraffin oil SUNPAR2280, and 4 parts of coumarone resin were added, and mixed for 3 min. Finally, 3 parts of the crosslinking agent dicumyl peroxide (DCP), and 0.3 parts of the auxiliary crosslinking agent sulfur were added, mixed for 2 min, and then discharged. The rubber mix was plasticated on an open mill, and the sheet was unloaded, stood and inspected.

(194) The discharged sheet was remilled, weighed, and molded.

(195) (2) Molding vulcanization: The vulcanization temperature was 160° C., the steam pressure was 0.6 MPa, and the vulcanization time was 25 minutes.

(196) (3) After cooling, trimming, and inspecting, a finished product was obtained.

Example 35

(197) A rubber/steel plate composite expansion and contraction installation was produced through the following steps.

(198) (1) Mixing and molding: The rubber portion was produced with the rubber composition of Example 11. The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 40 rpm. 100 parts of branched polyethylene PER-4 was added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide, 1 part of stearic acid, and 2 parts of the anti-aging agent RD were added and mixed for 1 min. Then 50 parts of carbon black N330, 10 parts of calcium carbonate, 5 parts of paraffin oil SUNPAR2280, and 4 parts of coumarone resin were added, and mixed for 3 min. Finally, 3 parts of the crosslinking agent dicumyl peroxide (DCP), and 0.3 parts of the auxiliary crosslinking agent sulfur were added, mixed for 2 min, and then discharged. The rubber mix was plasticated on an open mill, and the sheet was unloaded, stood and inspected. The discharged sheet was remilled, weighed, and molded.

(199) (2) Vulcanization process: The rubber sheet, and a steel plate that was surface treated and coated with an adhesive were laminated according to the process requirements, then filled into a preheated mold, and vulcanized for 25 min on a press vulcanizer at a vulcanization temperature of 160° C., under a steam pressure of 0.6 MPa.

(200) (3) Post-treatment: After vulcanization, the mold was pulled out and disassembled, and the finished rubber support product was removed, cooled, stood and trimmed to obtain the finished product.

Example 36

(201) A rubber railway pad was produced through the following steps.

(202) (1) Mixing: The rubber composition in Example 14 was used. The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 40 rpm. 80 parts of PER-8 and 20 parts of PER-1 were added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide and 1 part of stearic acid were then added, and mixed for 1 min. Then 75 parts of carbon black N330, and 20 parts of hydrogenated rosin were added, and mixed for 3 min. Finally, 3.5 parts of the crosslinking agent dicumyl peroxide (DCP), 3 parts of N,N′-m-phenylene bismaleimide and 1 part of the auxiliary crosslinking agent paraquinonedioxime were added, mixed for 2 min, and then discharged. The rubber mix was stood, inspected, and hot milled, the sheet was discharged according to the desired thickness, and cut to have the desired specification and shape, for use in the vulcanization process.

(203) (2) Molding vulcanization: The vulcanization temperature was 160° C., the steam pressure was 0.6 MPa, and the vulcanization time was 25 minutes.

(204) (3) The rubber sheet was trimmed, and inspected to obtain a finished product.

Example 37

(205) A rubber fender was produced through the following steps.

(206) (1) Mixing: The rubber composition in Example 15 was used. The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 40 rpm. 100 parts of branched polyethylene PER-7 was added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide and 1 part of stearic acid were added and mixed for 1 min. Then 125 parts of carbon black N330, 80 parts of paraffin oil SUNPAR2280 SUNPAR2280 and 5 parts of polyethylene wax were added, and mixed for 3 min. Finally, 4 parts of the crosslinking agent dicumyl peroxide (DCP), and 1 part of the auxiliary crosslinking agent triallyl isocyanurate (TAIC) were added, mixed for 2 min, and then discharged.

(207) (2) Molding vulcanization: The rubber mix was fed to a mold cavity, the mold was closed, and the rubber compound was flowed fully, followed by venting, mold closing, and vulcanizing, where the vulcanization temperature was 160° C., and the vulcanization time was 25 minutes.

(208) (3) The mold was opened, and the product was removed, trimmed, and inspected to obtain a finished product.

Example 38

(209) A rubber water stop was produced through the following steps.

(210) (1) Mixing and molding: The rubber composition in Example 16 was used. The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 40 rpm. 100 parts of branched polyethylene PER-4 was added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide and 1 part of stearic acid were added and mixed for 1 min. Then 45 parts of carbon black N330, 5 parts of paraffin oil SUNPAR2280, and 3 parts of coumarone resin were added, and mixed for 3 min. Finally, 3 parts of the crosslinking agent dicumyl peroxide (DCP), 1 part of the auxiliary crosslinking agent triallyl isocyanurate (TAIC) and 0.3 part of the auxiliary crosslinking agent sulfur were added, mixed for 2 min, and then discharged. The discharged sheet was stood, inspected, remilled, weighed, and molded.

(211) (2) Molding vulcanization: The vulcanization temperature was 160° C., the steam pressure was 0.6 MPa, and the vulcanization time was 25 minutes.

(212) (3) The rubber sheet was trimmed, and inspected to obtain a finished product.

Example 39

(213) A steel-edge rubber water stop was produced through the following steps.

(214) (1) Mixing and molding of rubber portion: The rubber composition in Example 16 was used. The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 40 rpm. 100 parts of branched polyethylene PER-4 was added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide and 1 part of stearic acid were added and mixed for 1 min. Then 45 parts of carbon black N330, 5 parts of paraffin oil SUNPAR2280, and 3 parts of coumarone resin were added, and mixed for 3 min. Finally, 3 parts of the crosslinking agent dicumyl peroxide (DCP), 1 part of the auxiliary crosslinking agent triallyl isocyanurate (TAIC) and 0.3 part of the auxiliary crosslinking agent sulfur were added, mixed for 2 min, and then discharged. The discharged sheet was stood, inspected, remilled, weighed, and molded.

(215) (2) Vulcanization process: The rubber sheet, and a steel plate that was surface treated and coated with an adhesive were laminated according to the process requirements, then filled into a preheated mold, and vulcanized for 25 min on a press vulcanizer at a vulcanization temperature of 160° C., under a steam pressure of 0.6 MPa.

(216) (3) The rubber sheet was trimmed, and inspected to obtain a finished product.

Example 40

(217) A vehicle shock-absorbing support was produced through the following steps.

(218) (1) Mixing and molding of rubber portion: The rubber composition in Example 17 was used. The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 40 rpm. 100 parts of branched polyethylene was added, prepressed and mixed for 90 seconds. 10 parts of zinc oxide, 1 part of the anti-aging agent RD and 1 part of stearic acid were added and mixed for 1 min. Then 80 parts of carbon black N550, and 100 parts of paraffin oil SUNPAR2280 were added, and mixed for 3 min. Finally, 3 parts of the crosslinking agent dicumyl peroxide (DCP), 0.5 part of N-cyclohexyl-2-benzothiazole sulfenamide (CZ), 1.25 parts of tetramethyl thiuram disulfide (TT) and 0.3 part of the auxiliary crosslinking agent sulfur were added, mixed for 2 min, and then discharged. The discharged sheet was stood, inspected, remilled, weighed, and molded.

(219) (2) Vulcanization process: The rubber sheet, and a metal piece that was surface treated and coated with an adhesive were laminated according to the process requirements, then filled into a preheated mold, and vulcanized for 25 min on a press vulcanizer at a vulcanization temperature of 160° C., under a steam pressure of 0.6 MPa.

(220) (3) The rubber sheet was trimmed, and inspected to obtain a finished product.

(221) The shock-absorbing support produced in this example can be used in high-temperature sites such as engine and exhaust pipe.

Example 41

(222) A rubber roller was produced through the following steps.

(223) (1) Mixing: The rubber composition in Example 18 was used. The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 40 rpm. 100 parts of branched polyethylene PER-6 was added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide and 1 part of stearic acid were added and mixed for 1 min. Then 65 parts of carbon black N330, and 45 parts of paraffin oil SUNPAR2280 were added, and mixed for 3 min. Finally, 3 parts of the crosslinking agent dicumyl peroxide (DCP), and 2 parts of the auxiliary crosslinking agent ethylene glycol dimethacrylate were added, mixed for 2 min, and then discharged. The rubber compound was plasticated on an open mill, and then the sheet was discharged and stood for 24 hrs.

(224) (2) Winding and wrapping: The rubber mix was fed to a screw extruder; a rubber sheet with a thickness and width required by the process was extruded; after the rubber sheet was uniform, the rotating wrapping machine was started to wind the rubber sheet onto a ready-to-use metal roller core; the rubber was wound and wrapped layer by layer until the thickness at the wrapped single side reached the specified thickness; and then 2-3 layers of nylon cure wrapping tape was wound on the rubber surface to obtain a wrapped rubber roller.

(225) (3) Vulcanization by a vulcanization tank: The wrapped rubber roller was sent to a vulcanization tank, and then the tank was closed. Steam was introduced into the vulcanization tank for vulcanization, during which the compressed air valve was opened to introduce compressed air, such that the pressure in the vulcanization tank reached 4.5-5 atmospheres in 0.5 h. The vulcanization procedure was heating to 70-80° C. and heat preserving for 2 h; then heating to 100-110° C. and heat preserving for 0.5 h; next heating to 120-130° C. and heat preserving for 0.5 h; and then heating to 135-140° C. and heat preserving for 8-10 h. After vulcanization, the vent valve was opened to reduce the pressure. The safety pin was opened when the pressure gauge pointed to zero. Then the vulcanization tank was half opened when the steam was emitted and escaped from the pin hole, to allow the temperature to decrease. The rubber roller was pulled out when the temperature inside the tank was lower than 60° C. or equivalent to the room temperature.

(226) (4) The vulcanized rubber roller was roughly machined on a lathe, then finished on a grinding machine, and inspected to obtain a finished product.

Example 42

(227) A high-temperature resistant ribbed belt having a buffer layer using the rubber composition provided in the present invention was produced through the following steps.

(228) 1. Mixing

(229) (1) Mixing of rubber compound used in compression layer: The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 50 rpm. 100 parts of branched polyethylene PER-5 was added, prepressed and mixed for 90 seconds. 6 parts of zinc oxide, 1 part of stearic acid, and 2 parts of the anti-aging agent RD were added and mixed for 1 min. Then 45 parts of carbon black N330, 5 parts of paraffin oil SUNPAR2280 and 5 parts of coumarone resin were added to the rubber compound, and mixed for 3 min. Next, 60 parts of 1 mm-long nylon staple fiber was added and mixed for 2 min. Finally, 4 parts of the crosslinking agent dicumyl peroxide (DCP), and 1.5 part of the auxiliary crosslinking agent triallyl isocyanurate (TAIC) were added, mixed for 2 min, and then discharged. The rubber mix was plasticated 7 times on an open mill with a roll temperature of 80° C. and a roll gap of 0.5 mm such that the staple fiber was well oriented, and then the roll gap was increased to obtain a sheet having a thickness of about 2.5 mm, which was unloaded, and stood for 20 hours.

(230) (2) Mixing of rubber compound used in the buffer layer: The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 40 rpm. 100 parts of branched polyethylene PER-5 was added, prepressed and mixed for 90 seconds. 6 parts of zinc oxide, 2 parts of the anti-aging agent RD and 1 part of stearic acid were added and mixed for 1 min. Then 55 parts of carbon black N330, 5 parts of paraffin oil SUNPAR2280, and 5 parts of coumarone resin were added, and mixed for 3 min. Finally, 4 parts of the crosslinking agent dicumyl peroxide (DCP), 1.5 parts of the auxiliary crosslinking agent triallyl isocyanurate (TAIC), 10 parts of the auxiliary crosslinking agent zinc methacrylate and 0.3 part of the auxiliary crosslinking agent sulfur were added, mixed for 2 min, and then discharged.

(231) (2) Molding: A reverse molding method was used. A blank mold was mounted on a forming machine, the mold was cleaned, a small amount of release agent was applied, a top cloth of the ribbed belt was attached to the blank mold after volatilization, then the buffer rubber was attached, the tension of the string was corrected, the strength layer was flatly wound, then the buffer rubber was attached again, and finally the ribbed rubber was attached to the outer circumference required by the molding process to obtain a belt blank;

(232) 3. vulcanization: The belt blank was sent to a vulcanization procedure for vulcanization, where the vulcanization temperature was 160° C., the internal pressure was 0.45-0.55 MPa, the external pressure was 1.0-1.2 MPa, and the vulcanization time was 30 minutes.

(233) (4) Post-treatment: After the vulcanization is completed, the belt roll was cooled, released from the mold, sent to a cutting procedure, and cut according to the required width. The back side was rubbed, and the ribs were rubbed, to obtain a finished product after trimming, and inspecting.

Example 43

(234) A windshield wiper was produced through the following steps.

(235) (1) Mixing: The rubber composition in Example 25 was used. The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 40 rpm. 100 parts of branched polyethylene PER-5 was added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide and 1 part of stearic acid were added and mixed for 1 min. Then 65 parts of carbon black N330, and 45 parts of paraffin oil SUNPAR2280 were added, and mixed for 3 min. Finally, 3 parts of the crosslinking agent dicumyl peroxide (DCP), and 2 parts of the auxiliary crosslinking agent ethylene glycol dimethacrylate were added, mixed for 2 min, and then discharged. The rubber compound was plasticated on an open mill, and then the sheet was discharged and stood for 24 hrs.

(236) (2) The rubber mix was injected into a mold cavity, and vulcanized and molded at 160° C. for 25 min.

(237) (3) The vulcanized product was subjected to surface treatment and inspected to obtain a finished product.

Example 44

(238) A sealing ring was produced through the following steps.

(239) (1) Mixing: The rubber composition in Example 26 was used. The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 40 rpm. 100 parts of branched polyethylene PER-4 was added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide and 1 part of stearic acid were added and mixed for 1 min. Then 50 parts of carbon black N550, and 5 parts of polyethylene wax were added, and mixed for 3 min. Finally, 3.5 parts of the crosslinking agent dicumyl peroxide (DCP), and 1 part of the auxiliary crosslinking agent triallyl isocyanurate (TAIC) were added, mixed for 2 min, and then discharged. The rubber mix was plasticated on an open mill, and then the sheet was unloaded, and detected properties. The rubber mix was remilled, and extruded to obtain a semi-finished product.

(240) (2) Vulcanization: Stage I molding vulcanization was performed for 20 min at a temperature of 160° C., and then stage II oven vulcanization was performed for 1 h at a temperature of 150° C.

(241) (3) The rubber sheet was trimmed, and inspected to obtain a finished product.

Example 45

(242) A waterproof coil was produced through the following steps.

(243) (1) Mixing: The rubber composition in Example 27 was used. The temperature of the internal mixer was set to 90° C., and the rotor speed was set to 40 rpm. 100 parts of branched polyethylene PER-5 was added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide and 1 part of stearic acid were added and mixed for 1 min. Then 70 parts of carbon black N330, 30 parts of carbon black N550, 40 parts of paraffin oil SUNPAR2280, and 5 parts of coumarone resin were added, and mixed for 3 min. Finally, 4 parts of the crosslinking agent dicumyl peroxide (DCP), 1 part of the auxiliary crosslinking agent triallyl isocyanurate (TAIC) and 0.3 part of the auxiliary crosslinking agent sulfur were added, mixed for 2 min, and then discharged. The block rubber compound was fed to an open mill, mixed, and then plasticated at least 4 times with the roll temperature controlled between 85 and 95° C. and the roll gap controlled to be less than 1 mm, until the surface of the rubber compound was smooth, uniform and glossy. Then, the rubber compound was further mixed and plasticated at least 4 times again. The roll gap was then adjusted to no more than 8 mm, and the rubber compound was mix three times, to obtain a sheet of well mixed rubber compound with a thickness of 8 m or less, which was cooled to 50° C. or below, discharged and stacked.

(244) (2) Hot milling: The sheet of well mixed rubber compound was hot milled on an open mill with the roll temperature controlled between 85 to 95° C. and the roll gap controlled to be less than 6 mm until the rubber sheet was smooth and even, and then the rubber sheet was preliminarily rolled up.

(245) (3) Calendering: The rubber sheet that was hot milled and preliminarily rolled up was placed on a calender, calendered with a roll gap adjusted according to the thickness requirement of the finished product, to obtain a semi-finished coil meeting the requirement of the thickness specification of the finished product.

(246) (4) Rolling: An isolation liner layer was sandwiched according to the requirement of the length specification of the finished coiled sheet and the semi-finished coil was rolled up.

(247) (5) Vulcanization: The coil was vulcanized in a nitrogen-filled vulcanizer, where the temperature in the vulcanizer was controlled to 155-165° C., the pressure was controlled to 20-25 MPa, and the vulcanization time was 25 to 30 min.

(248) (6) Re-rolling: The vulcanized coil was unfolded, and the isolation liner layer was removed, followed by re-rolling, and packaging into a product.

Example 46

(249) A plate-type rubber sealing strip for a radiator of an engine cooling system was produced by molding vulcanization and vulcanization in stages. The production method comprises the following steps.

(250) (1) Rubber mixing: The temperature of the internal mixer was set to 80° C., and the rotor speed was set to 40 rpm. 100 parts of branched polyethylene PER-5 was added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide, 1 part of stearic acid, 1 part of the anti-aging agent RD and 2 parts of the mixed fatty acid derivative WB42 were added and mixed for 1 min. Then 60 parts of carbon black N550 and 25 parts of paraffin oil SUNPAR2280 were added, and mixed for 3 min. Finally, 4 parts of the crosslinking agent, 1 part of the auxiliary crosslinking agent Bis-(t-Butylperoxy isopropyl) benzene (BIPB) and 0.3 part of the auxiliary crosslinking agent sulfur were added, mixed for 2 min, and then discharged. The rubber mix was stood and inspected.

(251) (2) The rubber mix inspected qualified was subjected to extrusion molding by an extruder, cut, and vulcanized in a mold of a vulcanization apparatus, where the vulcanization pressure was 15 MPa, the vulcanization temperature was 180° C., and the vulcanization time was preferably 2.5 min.

(252) (3) The vulcanized product was trimmed.

(253) (4) The trimmed product was subjected to stage II vulcanization at a high temperature, where the temperature was 170° C., and the time was 30 min.

(254) (5) The product was inspected and stored after being inspected qualified.

Example 47

(255) An inner tire was produced through the following process.

(256) (1) Rubber mixing: The temperature of the internal mixer was set to 100° C., and the rotor speed was set to 50 rpm. 100 parts of branched polyethylene PER-5 was added, prepressed and mixed for 90 seconds. 5 parts of zinc oxide, 1 part of stearic acid and 3 parts of coumarone resin were added and mixed for 2 min. Then 60 parts of carbon black N660, and 20 parts of paraffin oil SUNPAR2280 were added to the rubber compound, and mixed for 3 min. Finally, 4 parts of the crosslinking agent dicumyl peroxide (DCP), and 2 parts of the auxiliary crosslinking agent N,N′-m-phenylene bismaleimide (HVA-2) were added, mixed for 2 min, and then discharged. The rubber mix was strained, plasticated on an open mill, and then stood for 20 hrs.

(257) (2) Extrusion: The extruder temperature was set to 85° C., the die temperature was set to 115° C., and the speed of the conveyor belt was matched with the extrusion speed. An inflating valve was fitted.

(258) (3) Splicing: The belt was spliced by a splicer, and then stood.

(259) (4) Inflation forming and vulcanization: The product was first inflated to 70%, allowed to stand for 15 seconds, and then inflated to the forming size. The vulcanization temperature was 180° C., the steam pressure was 0.9 MPa, and the vulcanization time was 8 minutes. After the vulcanization was completed, it was removed and cooled.

(260) (5) After inspecting and trimming, a finished inner tire product was obtained.

Example 48

(261) A plate-type rubber support of bridge was produced with a rubber composition in which the rubber matrix was 100 parts of branched polyethylene PER-12. The remaining components in the rubber composition and the processing steps were the same as those in Example 30.

(262) The rubber mix of the rubber composition was subjected to molding vulcanization to prepare a sample, which was tested to have the following performances:

(263) hardness: 65; tensile strength: 27.3 MPa; elongation at break: 442%; compression set (at 70° C. for 22 h): 8%.

Example 49

(264) A vehicle shock-absorbing support was produced with a rubber composition in which the rubber matrix was 70 parts of branched polyethylene PER-10 and 30 parts of branched polyethylene PER-12. The remaining components in the rubber composition and the processing steps were the same as those in Example 40.

(265) The rubber mix of the rubber composition was subjected to molding vulcanization to prepare a sample, which was tested to have the following performances:

(266) hardness: 63; tensile strength: 27.5 MPa; elongation at break: 382%; compression set (at 70° C. for 22 h): 9%.

Example 50

(267) A rubber railway pad was produced with a rubber composition in which the rubber matrix was 100 parts of branched polyethylene PER-11. The remaining components in the rubber composition and the processing steps were the same as those in Example 36.

(268) The rubber mix of the rubber composition was subjected to molding vulcanization to prepare a sample, which was tested to have the following performances:

(269) hardness: 75; tensile strength: 26.8 MPa; elongation at break: 347%; compression set (at 70° C. for 22 h): 9%.

(270) In summary, it can be found through comparison that the rubber composition of the present invention has more excellent comprehensive physical properties than the rubber composition based on the ethylene-propylene rubber in the prior art, and can significantly optimize the usage of the anti-aging rubber product at low cost, and broaden the application scope of anti-aging rubber products.