Low-modulus high-adhesion silane-modified polyether sealant for prefabricated building, and preparation method therefor

Abstract

A low-modulus high-adhesion silane-modified polyether sealant for prefabricated buildings is provided by including a composition A and a composition B, wherein the composition A includes silane-modified polyether, plasticizer, hydroxy-terminated branched polyether, branched polyether epoxy resin, coupling agent, thixotropic agent, silica, reinforcing filler A, hollow glass microspheres and toner, and the composition B includes plasticizer, hydroxy-terminated branched polyether, light stabilizer, reinforcing filler B, organotin catalyst and amine curing agent. The present disclosure also optimized the various ingredients in the silane-modified polyether sealant, and a formulation of sealant having the best bonding effect was obtained. The two-composition polyether sealant system has good compatibility, greatly improves the adhesive properties thereof, achieves a good adhesion and waterproofing effect without needing to be used with a priming coating, and also avoids the risk of water leakage caused by misoperation in the applying of the priming coating existing in the prior art.

Claims

1. A silane-modified polyether sealant for prefabricated buildings, comprising, in parts by weight: TABLE-US-00014 composition A: silane-modified polyether 20-40 parts; plasticizer of the composition A 0-10 parts; hydroxyl-terminated branched 0-30 parts; polyether of the composition A branched polyether epoxy resin 1-5 parts; coupling agent 0.5-3 parts; thixotropic agent 1-3 parts; silica 0-10 parts; reinforcing filler A 20-50 parts; hollow glass microspheres 0-8 parts; toner 1-5 parts; TABLE-US-00015 composition B: plasticizer of the composition B 0-3 parts; hydroxyl-terminated branched 0-3 parts; polyether of the composition B light stabilizer 0.2-1 parts; reinforcing filler B 1-5 parts; organotin catalyst 0.3-1.2 parts; amine curing agent 0.5-3 parts; wherein, in the composition A, the parts by weight of the plasticizer of the composition A and the parts by weight of the hydroxyl-terminated branched polyether of the composition A are not 0 at the same time, and/or, in the composition B, the parts by weight of the plasticizer of the composition B and the parts by weight of the hydroxyl-terminated branched polyether of the composition B are not 0 at the same time.

2. The silane-modified polyether sealant for prefabricated buildings according to claim 1, wherein the branched polyether epoxy resin is one or two of branched polyether epoxy resin TBEPO and branched polyether epoxy resin FBEPO, wherein, the structure of the branched polyether epoxy resin TBEPO is: ##STR00011## wherein, 1≤a≤25, 1≤b≤25, 1≤c≤25, 3≤a+b+c≤70; the structure of the branched polyether epoxy resin FBEPO is: ##STR00012## wherein, 1≤o≤15, 1≤p≤15, 1≤q≤15, 1≤r≤15, 4≤o+p+q+r≤40.

3. The silane-modified polyether sealant for prefabricated buildings according to claim 2, wherein the branched polyether epoxy resin is a mixture of the branched polyether epoxy resin TBEPO and the branched polyether epoxy resin FBEPO at a ratio of 3: (1.8-2.2).

4. The silane-modified polyether sealant for prefabricated buildings according to claim 2, wherein the silane-modified polyether is a mixture of a silane-modified polyether with a viscosity of 8 Pa.Math.s and a silane-modified polyether with a viscosity of 40 Pa.Math.s at a ratio of 22: (7-9).

5. The silane-modified polyether sealant for prefabricated buildings according to claim 1, wherein the silane-modified polyether has a structural feature of: ##STR00013## the silane-modified polyether has a viscosity of 6-82 Pa.s at 25° C.

6. The silane-modified polyether sealant for prefabricated buildings according to claim 1, wherein the plasticizer is of the composition A and the plasticizer of the composition B are each independently one or more of dioctyl phthalate, diisodecyl phthalate, diisononyl phthalate, dibutyl phthalate, dioctyl adipate, diisodecyl adipate, dioctyl sebacate, diisooctyl sebacate, diphenyl octyl phosphate, cresyl diphenyl phosphate and polypropylene glycol.

7. The silane-modified polyether sealant for prefabricated buildings according to claim 1, wherein the hydroxyl-terminated branched polyether is of the composition A and the hydroxyl-terminated branched polyether of the composition B are each independently one or two of polyether triols and pentaerythritol polyether tetrols.

8. The silane-modified polyether sealant for prefabricated buildings according to claim 1, wherein the coupling agent is one of γ-methacryloxypropyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane and isocyanatopropyltrimethoxysilane, or a mixture thereof.

9. The silane-modified polyether sealant for prefabricated buildings according to claim 1, wherein the thixotropic agent is one or more of polyamide wax, hydrogenated castor oil and organobentonite.

10. The silane-modified polyether sealant for prefabricated buildings according to claim 1, wherein the reinforcing filler A and the reinforcing filler B are independently selected from the group consisting of heavy calcium carbonate, nano-active calcium carbonate, silica powder and kaolin.

11. The silane-modified polyether sealant for prefabricated buildings according to claim 1, wherein the toner is titanium dioxide and/or carbon black.

12. The silane-modified polyether sealant for prefabricated buildings according to claim 1, wherein the light stabilizer is one or more of hindered amine light stabilizer and benzotriazole light stabilizer.

13. The silane-modified polyether sealant for prefabricated buildings according to claim 12, wherein the hindered amine light stabilizer is bis(2,2,6,6-tetramethyl-4-piperidinyl)sebacate, and/or the benzotriazole light stabilizer is 2-(5-chloro(2H)-benzotriazol-2-yl)-4-(methyl)-6-(tert-butyl)phenol.

14. The silane-modified polyether sealant for prefabricated buildings according to claim 1, wherein the organotin catalyst is one or more of tin diethylhexanoate, dibutyltin dilaurate, dioctyltin diacetate, stannous octoate and diorganotin bis(β-diketone ester).

15. The silane-modified polyether sealant for prefabricated buildings according to claim 1, wherein the amine curing agent is one or more of 1,3-cyclohexanebis(methylamine), isophorone diamine and polyether amine.

16. The silane-modified polyether sealant for prefabricated buildings according to claim 1, comprising, in parts by weight: TABLE-US-00016 composition A: silane-modified polyether with a viscosity of 40 22 parts; Pa .Math. s silane-modified polyether with a viscosity of 8  8 parts; Pa .Math. s polypropylene glycol 10 parts; pentaerythritol polyether tetrol 15 parts; branched polyether epoxy resin TBEPO  3 parts; branched polyether epoxy resin FBEPO  2 parts; γ-methacryloxypropyltrimethoxysilane 0.5 parts;  polyamide wax  2 parts; organobentonite 1 part; silica  3 parts; nano-active calcium carbonate 12 parts; heavy calcium carbonate 13 parts; hollow glass microspheres  6 parts; titanium dioxide 2.5 parts;  TABLE-US-00017 composition B: polyether triol 2.2 parts; (2-(5-chloro(2H)-benzotriazol-2-yl)-4- 0.4 parts; (methyl)-6-(tert-butyl)phenol) kaolin   4 parts; diorganotin bis(β-diketone ester) 0.4 parts; 1,3-cyclohexanebis(methylamine) 1.6 parts; polyether amine 1.4 parts; wherein the structure of the pentaerythritol polyether tetrol is: ##STR00014## wherein 1≤o≤15, 1≤p≤15, 1q≤15, 1≤r≤15, 4≤o+p+q+r≤40; and wherein the structure of the polyether triol is: ##STR00015## wherein 1≤a≤25, 1≤b≤25, 1≤c≤25, 3≤a+b+c≤70.

17. A method for preparing the silane-modified polyether sealant for prefabricated buildings of claim 1, comprising: (1) preparing composition A: a. adding the silane-modified polyether, the plasticizer of the composition A, the hydroxyl-terminated branched polyether of the composition A, the branched polyether epoxy resin, the thixotropic agent, the silica and the toner to a planetary cylinder, and stirring; b. adding the reinforcing filler A, dispersing and stirring under vacuum; c. unloading vacuum, adding the hollow glass microspheres to the planetary cylinder, and stirring under vacuum; and d. cooling and unloading vacuum, then adding the coupling agent, stirring under vacuum, and then unloading vacuum and discharging to obtain the composition A; (2) preparing composition B: a. adding the plasticizer of the composition B, the hydroxyl-terminated polyether of the composition B, the light stabilizer and the reinforcing filler B to another planetary cylinder, and stirring; b. unloading vacuum, adding the organotin catalyst and the amine curing agent, and stirring under vacuum; and c. unloading vacuum and discharging to obtain the composition B.

18. The method according to claim 17, comprising: (1) preparing composition A: a. adding the silane-modified polyether, the plasticizer of the composition A, the hydroxyl-terminated branched polyether of the composition A, the branched polyether epoxy resin, the thixotropic agent, the silica and the toner to the planetary cylinder, and stirring for 5-10 min; b. adding the reinforcing filler A, and dispersing and stirring under a vacuum degree of 0.08-0.1 MPa for 30-50 min; c. unloading vacuum, adding the hollow glass microspheres to the planetary cylinder, and stirring under a vacuum degree of 0.08-0.1 MPa for 15-20 min; and d. introducing cooling water to the planetary cylinder for cooling, then unloading vacuum when the temperature of the mixture drops below 50° C., adding the coupling agent, stirring under a vacuum degree of 0.08-0.1 MPa for 15-20 min, and then unloading vacuum and discharging to obtain the composition A; (2) preparing composition B: a. adding the plasticizer of the composition B, the hydroxyl-terminated branched polyether of the composition B, the light stabilizer and the reinforcing filler B to another planetary cylinder, and stirring under a vacuum degree of 0.08-0.1 MPa for 30-50 min; b. unloading vacuum, adding the organotin catalyst and the amine curing agent, and stirring under a vacuum degree of 0.08-0.1 MPa for 10-20 min; and c. unloading vacuum and discharging to obtain the composition B.

19. The method according to claim 17, wherein the branched polyether epoxy resin is prepared by a process comprising: (1) heating polyether polyol and vacuum dehydrating, reacting with epichlorohydrin by using boron trifluoride-diethyl ether complex as a catalyst, and removing unreacted small molecules; and (2) adding an appropriate amount of toluene for diluting, then adding excess solid sodium hydroxide, extracting organic phase, and then removing solvent and drying to obtain the branched polyether epoxy resin.

20. The method according to claim 19, wherein the branched polyether epoxy resin is prepared by a process comprising: (1) vacuum dehydrating polyether polyol at 100-150° C., reacting with epichlorohydrin by using boron trifluoride-diethyl ether complex as a catalyst in a nitrogen atmosphere at 55-65° C. for 5-10 h, and then removing unreacted small molecules; wherein the boron trifluoride-diethyl ether complex accounts for 0.3-1.0% of the total mass of the polyether polyol and the epichlorohydrin; and (2) cooling down to 25-50° C., adding an appropriate amount of toluene for diluting, adding excess solid sodium hydroxide, incubating for 4-6 h, then extracting organic phase solution, and removing solvent and drying to obtain the branched polyether epoxy resin.

Description

DETAILED DESCRIPTION OF THE EMBODIMENTS

(1) The present disclosure provides a low-modulus high-adhesion silane-modified polyether sealant for prefabricated buildings and preparation method thereof. In order to facilitate the understanding of the present disclosure, the present disclosure will be described in more detail hereinafter with reference to the embodiments, and preferred embodiments of the present disclosure are given below. However, the present disclosure may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided for the purpose of making the understanding of the disclosure of the present invention be more thorough and complete.

(2) Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by skilled person in the art to which this disclosure belongs. The terms used in the specification of the present disclosure are for the purpose of describing specific embodiments only and are not intended to limit the present disclosure. The term “and/or” used herein includes any and all combinations of one or more of the associated listed items.

(3) Each technical feature of the embodiments described below may be combined arbitrarily. To simplify the description, not all the possible combinations of the technical features in the following embodiments are described. However, all of the combinations of these technical features should be considered as within the scope of the present specification, as long as such combinations do not contradict with each other.

Example 1

(4) The present example provides a branched polyether epoxy resin and preparation method thereof, the method comprising the following steps of:

(5) (1) (1) weighing 768 g of pentaerythritol polyether tetrol PP150, heating up to 120° C. and dehydrating and degassing under vacuum for 20 min, then introducing dry nitrogen and cooling to room temperature, adding 5.62 g of boron trifluoride-diethyl ether complex as a catalyst, and stirring with a magnetic stirrer;

(6) (2) warming to 60±2° C., slowly adding 356 g of epichlorohydrin dropwise with a constant-pressure funnel over 2 h under stirring, then insulating for 6 h, and then removing unreacted epichlorohydrin under vacuum;

(7) (3) cooling down to 45±2° C. and adding an appropriate amount of toluene for diluting, then adding 112.4 g of excess solid sodium hydroxide in multiple portions over 2 h, and insulating for 6 h;

(8) (4) suction filtering the product, collecting filtrate with a separating funnel and extracting organic phase with toluene, and then washing with distilled water to neutral;

(9) (5) pouring the organic phase into a beaker, placing in a blast drying oven at 120° C. for 12 h for removing the solvent, then vacuum desolvating in a vacuum drying oven at 120° C. for 1 h to obtain a low-viscosity liquid branched polyether epoxy resin FBEPO with a good fluidity, a measured epoxy value of 0.63 and a viscosity of 560 mPa.Math.s.

(10) The chemical reactions involved in the above steps are as follows:

(11) ##STR00004##

(12) wherein, 1≤o≤15, 1≤p≤15, 1≤q≤15, 1≤r≤15, 4≤o+p+q+r≤40.

Example 2

(13) The present example provides a branched polyether epoxy resin and a preparation method thereof, the method comprising the following steps of:

(14) (1) weighing 1450 g of polyether triols N330, heating up to 120° C. and dehydrating and degassing under vacuum for 30 min, then introducing dry nitrogen and cooling to room temperature, adding 7.96 g of boron trifluoride-diethyl ether complex as a catalyst, and stirring with a magnetic stirrer;

(15) (2) warming to 60±0.5° C., slowly adding 142 g of epichlorohydrin dropwise with a constant-pressure funnel over 2 h under stirring, then insulating for 8 h, and then removing unreacted epichlorohydrin under vacuum;

(16) (3) cooling down to 45±0.5° C. and adding an appropriate amount of toluene for diluting, then adding 159.2 g of solid sodium hydroxide in multiple portions over 2 h, and insulating for 4 h;

(17) (4) suction filtering the product, collecting filtrate with a separating funnel and extracting the organic phase with toluene, and then washing with distilled water to neutral;

(18) (5) pouring the organic phase into a beaker, placing in a blast drying oven at 120° C. for 12 h for removing the solvent, then vacuum desolvating in a vacuum drying oven at 120° C. for 1 h to obtain a low-viscosity liquid branched polyether epoxy resin TBEPO with a good fluidity, a measured epoxy value of 0.12 and a viscosity of 2800 mPa.Math.s.

(19) The chemical reactions involved in the above steps are as follows:

(20) ##STR00005##

(21) wherein, 1≤a≤25, 1≤b≤25, 1≤c≤25, 3≤a+b+c≤70;

Example 3

(22) The low-modulus high-adhesion silane-modified polyether sealant for prefabricated buildings of the present example, comprising, in parts by weight:

(23) TABLE-US-00003 Composition A: silane-modified polyether 20 parts; hydroxy-terminated branched polyether 23 parts; (pentaerythritol polyether tetrol PP150) branched polyether epoxy resin FBEPO  3 parts; coupling agent (isocyanatopropyltrimethoxysilane)  2 parts; thixotropic agent (polyamide wax)  2 parts; silica  5 parts; reinforcing filler A (nano-active calcium carbonate) 36 parts; hollow glass microspheres  8 parts; toner (titanium dioxide)  2 parts;

(24) TABLE-US-00004 Composition B: hydroxy-terminated branched polyether   4 parts; (pentaerythritol polyether tetrol PP150) light stabilizer (bis(2,2,6,6-tetramethyl-4- 0.3 parts; piperidinyl)sebacate) reinforcing filler B (heavy calcium carbonate) 3.6 parts; organotin catalyst (dibutyltin dilaurate) 0.4 parts; amine curing agent (1,3-cyclohexanebis(methylamine)) 0.9 parts; amine curing agent (polyether amine D-230) 0.8 parts.

(25) Wherein, the above silane-modified polyether has a viscosity of 40 Pa.Math.s and has the structural features as follows:

(26) ##STR00006##

(27) The preparation method of the low-modulus high-adhesion silane-modified polyether sealant for prefabricated buildings of the present example comprises the following steps of:

(28) 1. Preparing the composition A:

(29) (1) adding the above silane-modified polyether, pentaerythritol polyether tetrol PP150, the branched polyether epoxy resin FBEPO prepared in example 1, polyamide wax, silica, titanium dioxide to a planetary cylinder, stirring for 8 min;

(30) (2) adding nano-active calcium carbonate thereto, stirring under vacuum degree of 0.08-0.1 MPa for 50 min;

(31) (3) unloading vacuum, adding hollow glass microspheres to the above planetary cylinder, stirring under a vacuum degree of 0.08-0.1 MPa for 15 min;

(32) (4) introducing cooling water to the planetary cylinder to cool, after cooling down the temperature of the mixture to below 50° C., unloading vacuum and then adding isocyanatopropyltrimethoxysilane, stirring under a vacuum degree of 0.08-0.1 MPa for 15 min, then unloading vacuum, and discharging to obtain the product.

(33) 2. Preparing the Composition B:

(34) (1) adding pentaerythritol polyether tetrol PP150, bis(2,2,6,6-tetramethyl-4-piperidinyl)sebacate, and heavy calcium carbonate to a planetary cylinder, stirring under a vacuum degree of 0.08-0.1 MPa for 30 min;

(35) (2) unloading vacuum, adding the dibutyltin dilaurate, the 1,3-cyclohexanebis(methylamine) and the polyether amine D-230, stirring under a vacuum degree of 0.08-0.1 MPa for 15 min;

(36) (3) unloading vacuum, and discharging to obtain the product.

(37) 3. When in use, the compositions A and B were mixed at a mass ratio of 10:1, mixing uniformly with a special two-composition stirrer, extracting the sealant with a special two-composition sealant gun and then applying the sealant.

Example 4

(38) The low-modulus high-adhesion silane-modified polyether sealant for prefabricated buildings of the present example, comprises, in parts by weight:

(39) TABLE-US-00005 Composition A: silane-modified polyether 28 parts; plasticizer (dioctyl phthalate)  5 parts; hydroxy-terminated branched polyether 20 parts; (polyether triol N330) branched polyether epoxy resin TBEPO 1 part; coupling agent (γ-glycidyloxypropyltrimethoxysilane)  3 parts; thixotropic agent (hydrogenated castor oil)  2 parts; silica  6 parts; reinforcing filler A (nano-active calcium carbonate) 20 parts; reinforcing filler A (silica powder) 10 parts; hollow glass microspheres  4 parts; toner (carbon black)  1 part;

(40) TABLE-US-00006 Composition B: plasticizer (dibutyl phthalate) 1.6 parts; hydroxy-terminated branched polyether (polyether triol N330)   3 parts; light stabilizer (bis(2,2,6,6-tetramethyl-4-piperidinyl)sebacate) 0.5 parts; reinforcing filler B (nano-active calcium carbonate) 3.8 parts; organotin catalyst (tin diethylhexanoate) 0.6 parts; amine curing agent (1,3-cyclohexanebis(methylamine)) 0.3 parts; amine curing agent (polyether amine D-230) 0.2 parts.

(41) The above silane-modified polyether has a viscosity of 40 Pa.Math.s and has the structural features as follows:

(42) ##STR00007##

(43) The preparation method of the low-modulus high-adhesion silane-modified polyether sealant for prefabricated buildings of the present example comprises the following steps of:

(44) 1. Preparing Composition A:

(45) (1) adding silane-modified polyether, dioctyl phthalate, polyether triol N330, branched polyether epoxy resin TBEPO, hydrogenated castor oil, silica and carbon black to a planetary cylinder, stirring for 10 min;

(46) (2) adding nano-active calcium carbonate and silica powder, dispersing and stirring under a vacuum degree of 0.08-0.1 MPa for 40 min;

(47) (3) unloading vacuum, adding hollow glass microspheres to the above planetary cylinder, stirring under a vacuum degree of 0.08-0.1 MPa for 15 min;

(48) (4) introducing cooling water to the planetary cylinder for cooling, after cooling down the temperature of the mixture to below 50° C., unloading vacuum and adding isocyanatopropyltrimethoxysilane, stirring under a vacuum degree of 0.08-0.1 MPa for 18 min, unloading vacuum, and discharging to obtain the composition A.

(49) 2. Preparing composition B:

(50) (1) adding dibutyl phthalate, polyether triol N330, bis(2,2,6,6-tetramethyl-4-piperidinyl)sebacate and nano-active calcium carbonate to a planetary cylinder, and stirring under a vacuum degree of 0.08-0.1 MPa for 50 min;

(51) (2) unloading vacuum, adding tin diethylhexanoate, 1,3-cyclohexanebis(methylamine) and polyether amine D-230, and stirring under a vacuum degree of 0.08-0.1 MPa for 15 min;

(52) (3) unloading vacuum and discharging to obtain the composition B.

(53) 3. When in use, the compositions A and B were mixed at a mass ratio of 10:1, mixing uniformly with a special two-composition stirrer, and extracting sealant stock with a special two-composition sealant gun to apply the sealant.

Example 5

(54) The low-modulus high-adhesion silane-modified polyether sealant for prefabricated buildings of the present example, comprises, in parts by weight:

(55) TABLE-US-00007 Composition A: silane-modified polyether (40 Pa .Math. s) 18 parts; silane-modified polyether (13 Pa .Math. s)  5 parts; hydroxy-terminated branched polyether (polyether 25 parts; triol N330) hydroxy-terminated branched polyether  5 parts; (pentaerythritol polyether tetrol PP150) branched polyether epoxy resin FBEPO  2 parts; coupling reagent (γ-methacryloxypropyltrimethoxysilane)  3 parts; thixotropic agent (organobentonite)  3 parts; silica 10 parts; reinforcing filler A (nano-active calcium carbonate) 13 parts; reinforcing filler A (heavy calcium carbonate) 10 parts; hollow glass microspheres  3 parts; toner (titanium dioxide)  3 parts;

(56) TABLE-US-00008 Composition B: plasticizer (cresyl diphenyl phosphate)   2 parts; hydroxy-terminated branched polyether   2 parts; (pentaerythritol polyether tetrol PP150) light stabilizer 0.6 parts; (2-(5-chloro(2H)-benzotriazol-2-yl)-4- (methyl)-6-(tert-butyl)phenol) reinforcing filler B (nano-active calcium carbonate) 3.6 parts; organotin catalyst (dioctyltin diacetate) 0.5 parts; amine curing agent (1,3-cyclohexanebis(methylamine)) 0.3 parts; amine curing agent (isophorone diamine)  1 part.

(57) Two kinds of silane-modified polyethers of 40 Pa.Math.s and 13 Pa.Math.s respectively were used in the above compositions, and were mixed at a ratio of 18:5, and the above silane-modified polyethers have the structural features as follows:

(58) ##STR00008##

(59) The preparation method of the low-modulus high-adhesion silane-modified polyether sealant for prefabricated buildings of the present example comprises the following steps of:

(60) 1. Preparing composition A:

(61) (1) adding silane-modified polyether, dioctyl phthalate, polyether triol N330, pentaerythritol polyether tetrol PP150, branched polyether epoxy resin FBEPO, organobentonite, silica and titanium dioxide to a planetary cylinder, and stirring for 10 min;

(62) (2) adding nano-active calcium carbonate and heavy calcium carbonate, dispersing and stirring under a vacuum degree of 0.08-0.1 MPa for 45 min;

(63) (3) unloading vacuum, adding hollow glass microspheres to the above planetary cylinder, stirring under a vacuum degree of 0.08-0.1 MPa for 20 min;

(64) (4) introducing cooling water to the planetary cylinder for cooling, after cooling down the temperature of the mixture to below 50° C., unloading vacuum and adding γ-methacryloxypropyltrimethoxysilane, then stirring under a vacuum degree of 0.08-0.1 MPa for 20 min, unloading vacuum and discharging to obtain the composition A.

(65) 2. Preparing Composition B:

(66) (1) adding cresyl diphenyl phosphate, pentaerythritol polyether tetrol PP150, 2-(5-chloro(2H)-benzotriazol-2-yl)-4-(methyl)-6-(tert-butyl)phenol, and nano-active calcium carbonate to a planetary cylinder, stirring under a vacuum degree of 0.08-0.1 MPa for 45 min;

(67) (2) unloading vacuum, adding dioctyltin diacetate, 3-cyclohexanebis(methylamine) and isophorone diamine, and stirring under a vacuum degree of 0.08-0.1 MPa for 15 min;

(68) (3) unloading vacuum and discharging to obtain the composition B.

(69) 3. When in use, the compositions A and B were mixed at a mass ratio of 10:1, mixing uniformly with a special two-composition stirrer, and extracting sealant stock with a special two-composition sealant gun to apply the sealant.

Example 6

(70) The low-modulus high-adhesion silane-modified polyether sealant for prefabricated buildings of the present example, comprises, in parts by weight:

(71) TABLE-US-00009 Composition A: silane-modified polyether (40 Pa .Math. s) 22 parts; silane-modified polyether (8 Pa .Math. s)  8 parts; plasticizer (polypropylene glycol) 10 parts; hydroxy-terminated branched polyether 15 parts; (pentaerythritol polyether tetrol PP150) branched polyether epoxy resin TBEPO  3 parts; branched polyether epoxy resin FBEPO  2 parts; coupling reagent (γ-methacryloxypropyltrimethoxysilane) 0.5 parts;  thixotropic agent (polyamide wax)  2 parts; thixotropic agent (organobentonite) 1 part; silica  3 parts; reinforcing filler A (nano-active calcium carbonate) 12 parts; reinforcing filler A (heavy calcium carbonate) 13 parts; hollow glass microspheres  6 parts; toner (titanium dioxide) 2.5 parts; 

(72) TABLE-US-00010 Composition B: hydroxy-terminated branched polyether (polyether triol N330) 2.2 parts; light stabilizer 0.4 parts; (2-(5-chloro(2H)-benzotriazol-2-yl)-4-(methyl)- 6-(tert-butyl)phenol) reinforcing filler B (kaolin)   4 parts; organotin catalyst (diorganotin bis(β-diketone ester)) 0.4 parts; amine curing agent (1,3-cyclohexanebis(methylamine)) 1.6 parts; amine curing agent (polyether amine D-230) 1.4 parts.

(73) Two kinds of silane-modified polyethers of 40 Pa.Math.s and 8 Pa.Math.s respectively were used in the above compositions, and were mixed at a ratio of 22:8, the silane-modified polyethers have the structural features as follows:

(74) ##STR00009##

(75) The preparation method of the low-modulus high-adhesion silane-modified polyether sealant for prefabricated buildings of the present example, comprises the following steps of:

(76) 1. Preparing composition A:

(77) (1) adding silane-modified polyether, polypropylene glycol, pentaerythritol polyether tetrol PP150, branched polyether epoxy resin TBEPO, branched polyether epoxy resin FBEPO, polyamide wax, organobentonite, silica and titanium dioxide to a planetary cylinder, stirring for 5 min;

(78) (2) adding nano-active calcium carbonate and heavy calcium carbonate, dispersing and stirring under vacuum degree of 0.08-0.1 MPa for 50 min;

(79) (3) unloading vacuum, adding hollow glass microspheres to the above planetary cylinder, stirring under a vacuum degree of 0.08-0.1 MPa for 20 min;

(80) (4) introducing cooling water to the planetary cylinder for cooling, after cooling down the temperature of the mixture to below 50° C., unloading vacuum and adding γ-methacryloxypropyltrimethoxysilane, then stirring under a vacuum degree of 0.08-0.1 MPa for 15 min, unloading vacuum, and discharging to obtain the composition A.

(81) 2. Preparing composition B:

(82) (1) adding polyether triol N330, 2-(5-chloro(2H)-benzotriazol-2-yl)-4-(methyl)-6-(tert-butyl)phenol and kaolin to another planetary cylinder, stirring under a vacuum degree of 0.08-0.1 MPa for 30 min;

(83) (2) unloading vacuum, adding diorganotin bis(β-diketone ester), 1,3-cyclohexanebis(methylamine) and polyether amine D-230, stirring under a vacuum degree of 0.08-0.1 MPa for 20 min;

(84) (3) unloading vacuum and discharging to obtain the composition B.

Example 7

(85) The low-modulus high-adhesion silane-modified polyether sealant for prefabricated buildings of the present example, comprises, in parts by weight:

(86) TABLE-US-00011 Composition A: silane-modified polyether (40 Pa .Math. s) 23 parts; silane-modified polyether (13 Pa .Math. s)  7 parts; silane-modified polyether (8 Pa .Math. s) 10 parts; hydroxy-terminated branched polyether 10 parts; (polyether triol N330) hydroxy-terminated branched polyether  5 parts; (pentaerythritol polyether tetrol PP150) branched polyether epoxy resin TBEPO  4 parts; coupling agent (isocyanatopropyltrimethoxysilane) 1.5 parts;  thixotropic agent (polyamide wax) 1 part; thixotropic agent (hydrogenated castor oil) 1 part; silica  8 parts; reinforcing filler A (nano-active calcium carbonate) 23 parts; hollow glass microspheres 5.5 parts;  toner (titanium dioxide) 1 part;

(87) TABLE-US-00012 Composition B: hydroxy-terminated branched polyether (polyether triol N330)   4 parts; light stabilizer (bis(2,2,6,6-tetramethyl-4-piperidinyl)sebacate) 0.2 parts; light stabilizer (2-(5-chloro(2H)-benzotriazol-2-yl)-4-(methyl)-6- 0.2 parts; (tert-butyl)phenol) reinforcing filler B (nano-active calcium carbonate) 2.4 parts; organotin catalyst (stannous octoate) 0.8 parts; amine curing agent (1,3-cyclohexanebis(methylamine)) 1.4 parts; amine curing agent (polyether amine D-230) 1.0 part. 

(88) Three kinds of silane-modified polyethers of 40 Pa.Math.s, 13 Pa.Math.s and 8 Pa.Math.s respectively were used in the above compositions, and were mixed according to a certain ratio, the above silane-modified polyethers have the structural features as follows:

(89) ##STR00010##

(90) The preparation method of the low-modulus high-adhesion silane-modified polyether sealant for prefabricated buildings of the present example, comprises the following steps of:

(91) 1. Preparing composition A:

(92) (1) adding silane-modified polyether, polyether triol N330, pentaerythritol polyether tetrol PP150, branched polyether epoxy resin TBEPO, polyamide wax, hydrogenated castor oil, silica and titanium dioxide to a planetary cylinder, stirring for 7 min;

(93) (2) then adding nano-active calcium carbonate, dispersing and stirring under vacuum degree of 0.08-0.1 MPa for 45 min;

(94) (3) unloading vacuum, adding hollow glass microspheres to the planetary cylinder, stirring under a vacuum degree of 0.08-0.1 MPa for 16 min;

(95) (4) introducing cooling water to the planetary cylinder for cooling, after cooling down the temperature of the supplies to below 50° C., unloading vacuum and adding isocyanatopropyltrimethoxysilane, stirring under a vacuum degree of 0.08-0.1 MPa for 20 min, unloading vacuum and discharging to obtain the composition A.

(96) 2. Preparing Composition B:

(97) (1) adding polyether triol N330, bis(2,2,6,6-tetramethyl-4-piperidinyl)sebacate, 2-(5-chloro(2H)-benzotriazol-2-yl)-4-(methyl)-6-(tert-butyl)phenol, and nano-active calcium carbonate to a planetary cylinder, stirring under a vacuum degree of 0.08-0.1 MPa for 40 min;

(98) (2) unloading vacuum, adding stannous octoate, 1,3-cyclohexanebis(methylamine) and polyether amine D-230, stirring under a vacuum degree of 0.08-0.1 MPa for 20 min;

(99) (3) unloading vacuum and discharging to obtain the composition B.

(100) 3. When in use, the compositions A and B were mixed at a mass ratio of 10:1, mixing uniformly with a special two-composition stirrer, extracting sealant stock with a special two-composition sealant gun and then conducting sealant applying.

Comparative Example 1

(101) The difference between the present Comparative Example and the Example 6 is that no branched polyether epoxy resin was added to the composition A of the present comparative example, the remaining ingredients and preparation methods were the same as that in Example 6.

(102) The performance test was carried out for the low-modulus high-adhesion silane-modified polyether sealants for prefabricated buildings prepared in Examples 3-7 and Comparative Example 1. The specific test standards and test data are shown in Table 1.

(103) TABLE-US-00013 TABLE 1 The results of performance tests Example Example Example Example Example Comparative Test Items 3 4 5 6 7 Example 1 standard Displacement ±25 ±25 ±25 ±25 ±25 ±25 ISO 11600 ability (%) Elastic recovery 90 90 91 93 92 90 ISO 7398  rate (%) Tensile   23° C. 0.23 0.20 0.24 0.26 0.25 0.19 ISO 8339  modulus −20° C. 0.24 0.21 0.25 0.28 0.26 0.20 (N/mm2) Adhesions at definite No No No No No Interface ISO 8340  elongation damage damage damage damage damage damage Adhesions after cold No No No No No Interface ISO 9047  draw-hot press damage damage damage damage damage damage Adhesions at definite No No No No No Interface ISO 10590 elongation after damage damage damage damage damage damage immersion in water Volume changes 1 1 1 1 1 1 ISO 10563 rate (%) Resistance to 0 0 0 0 0 0 ISO 7390  flow (mm)

(104) It can be seen from the experimental results in Table 1 that the low-modulus high-adhesion silane-modified polyether sealant for prefabricated buildings of the present disclosure can meet the requirements of various indexes of ISO 11600-F-25LM, and can satisfy the requirements of the joint sealing of the prefabricated buildings. While the product of Comparative Example 1 has no adhesion to substrates when it is not used with priming coating in combination, and cannot satisfy the requirements for use.

(105) The above-mentioned examples are merely illustrative of several embodiments of the present disclosure, and the description thereof is more specific and detailed, but it cannot be understood to limit the scope of the present disclosure. It should be noted that, for those ordinary skilled in the art, several variations and improvements may be made without departing from the concept of the present disclosure, and these are all within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be defined by the appended claims.