GREEN ENVIRONMENTALLY FRIENDLY ADHESIVE DIPPING LIQUID AND METHOD FOR PRODUCTION THEREOF

Abstract

An environment-friendly impregnation solution includes in percentage by weight: 1-15% of blocked isocyanate, 0.5-10% of special amino resin, 10-50% of rubber latex, 1-5% of auxiliaries, and the balance of water, wherein the sum of the weight percentage of each component is 100%. A method for preparing the environment-friendly impregnation solution includes adding blocked isocyanate and auxiliary A into water and stirring uniformly to obtain Composition 1; adding auxiliary B into Composition 1 and stirring uniformly to obtain Composition 2; adding special amino resin into Composition 2 and stirring uniformly, then subjecting the same to grinding to obtain Composition 3; adding rubber latex into Composition 3 and stirring uniformly to obtain the environment-friendly impregnation solution, followed by packaging. The impregnation solution of the invention does not contain toxic and harmful substances such as formaldehyde and resorcinol, and the preparation method thereof is simple.

Claims

1. An environment-friendly impregnation solution, wherein, the environment-friendly impregnation solution consists of the following raw materials in percentage by weight: 1-15% of blocked isocyanate, 0.5-10% of special amino resin, 10-50% of rubber latex, 1-5% of auxiliaries, and the balance of water, wherein the sum of the weight percentage of each component is 100%; the auxiliaries consist of Auxiliary a and Auxiliary b, with the mass ratio of 1:1-3.

2. The environment-friendly impregnation solution according to claim 1, wherein, the environment-friendly impregnation solution consists of the following raw materials in percentage by weight: 1-5% of blocked isocyanate, 1.5-10% of special amino resin, 20-40% of rubber latex, 3-5% of auxiliaries, and the balance of water, wherein the sum of the weight percentage of each component is 100%; the auxiliaries consist of auxiliary a and auxiliary b, with the mass ratio of 1:1-3.

3. The environment-friendly impregnation solution according to claim 1, wherein, the special amino resin is one or more of urea-formaldehyde resin, melamine-formaldehyde resin, benzoxazine resin, and polyamide polyamine epichlorohydrin.

4. The environment-friendly impregnation solution according to claim 1, wherein, the rubber latex is one or more of butadiene-vinylpyridine copylymer latex, butadiene latex, ethylene propylene diene monomer (EPDM), styrene-butadiene latex, natural latex, butyronitrile latex, carboxylic butadiene-vinylpyridine copylymer latex, carboxylic styrene-butadiene latex, and carboxylic butyronitrile latex.

5. The environment-friendly impregnation solution according to claim 1, wherein, the Auxiliary a is Tween 20, sodium diisobutyl naphthalene sulfonate, Tween 80, or fatty alcohol polyoxyethylene ether.

6. The environment-friendly impregnation solution according to claim 1, wherein, the Auxiliary b is a grinding aid for superfinely wet-grinding high-granularity kaolin and porcelain clay, aqueous calcium stearate emulsion, or sodium hexametaphosphate.

7. The environment-friendly impregnation solution according to claim 1, wherein, the solid content of the environment-friendly impregnation solution is 5-30%.

8. A method for preparing the environment-friendly impregnation solution, wherein, the method comprises the following steps: a) firstly, weighing the respective raw materials in a ratio according to the formula of the environment-friendly impregnation solution; b) adding the weighed blocked isocyanate and Auxiliary a into water and stirring uniformly to obtain Composition 1; c) then adding Auxiliary b to the obtained Composition 1 and stirring uniformly to obtain Composition 2; d) and adding special amino resin to the obtained Composition 2 and stirring uniformly, then grinding to obtain Composition 3; e) adding rubber latex to the obtained Composition 3, and stirring uniformly to obtain the environment-friendly impregnation solution, followed by packaging.

9. The method for preparing the environment-friendly impregnation solution according to claim 8, wherein, the particle size distribution of solids in Composition 3 after the grinding in step d) is between 1 and 50 μm.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0029] One or more examples are exemplified by the FIGURES in the accompanying drawings that correspond thereto and are not intended to be limiting of the embodiments. As used herein, the word “exemplary” means “serving as an example, embodiment, or illustrative”. Any embodiment described herein as “exemplary” is not necessarily to be construed as being superior to or better than other embodiments.

[0030] FIG. 1 is a schematic diagram of the process flow of the preparation method of the environment-friendly impregnation solution of the invention.

DETAILED DESCRIPTION OF THE INVENTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the invention clearer, the technical solutions in the embodiments of the invention will be clearly and completely illustrated with reference to one or more embodiments and corresponding drawings.

[0032] Obviously, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of the present invention. Throughout the specification and claims, the term “comprising” or variations thereof, such as “including” or “containing” and the like, will be understood to include the stated components and not to exclude other elements or other components, unless expressly indicated otherwise.

[0033] These embodiments are not intended to limit the scope of protection. Unless otherwise stated, any embodiment herein is not necessarily to be construed as being superior to or better than other embodiments.

[0034] In addition, in order to better explain the present invention, a lot of specific details are given in the following embodiments. It will be understood by those skilled in the art that the present invention may be practiced without certain specific details. In some embodiments, methods, means, elements well known to those skilled in the art, experimental methods generally according to conventional conditions and according to the conditions described in the manual or according to the conditions suggested by the manufacturer are not described in detail so as to highlight the spirit of the present invention. The materials and reagents used are conventionally commercially available, unless otherwise specified.

[0035] In the following examples, the raw materials used were all commercial available, in which:

[0036] blocked isocyanate, with a viscosity of 200-500 mpa.Math.s/25° C., a solid content of 50±1.5%, a density of 1.0±0.2 g/cm.sup.3 (20° C.), and a particle size of ≤5 μm;

[0037] Bisphenol A/aniline benzoxazine resin, with a molecular weight of 466-800, a softening point of 50-90° C., and gel time (210° C., 1 g) of 100-400 seconds;

[0038] Phenol/MDA benzoxazine resin, with a molecular weight of 438-800, a softening point of 50-90° C., and gel time (210° C., 1 g) of 100-400 seconds;

[0039] Bisphenol F/aniline benzoxazine resin, with a molecular weight of 438-800, a softening point of 50-90° C., and gel time (210° C., 1 g) of 100-400 seconds;

[0040] Butadiene-vinylpyridine copylymer latex, with a viscosity of 20-45 mpa.Math.s/25° C., a solid content of 39.5-41.5%, a density of 0.980-0.990 g/cm.sup.3 (20° C.), and pH 10-12;

[0041] Carboxylic styrene-butadiene latex, with a viscosity of 4-350 mpa.Math.s/25° C., a solid content of 48.0-54.0%, a density of 0.970-0.100 g/cm.sup.3 (20° C.), and pH 7.0-9.0;

[0042] Styrene-butadiene latex, with a viscosity of 200-800 mpa.Math.s/25° C., a solid content of 48.0-61.0%, a density of 0.960-0.980 g/cm.sup.3 (20° C.), and pH 8.0-10.5;

[0043] Butadiene latex, with a viscosity of 10-50 mpa.Math.s/25° C., a solid content of 48.0-54.0%, a density of 1.01-1.20 g/cm.sup.3 (20° C.), and pH 12.0-14.0;

[0044] Butyronitrile latex, with a viscosity of 7-50 mpa.Math.s/25° C., a solid content of 43.0-45.0%, and pH 7.0-8.0;

[0045] Carboxylic styrene-butadiene latex, with a viscosity of 4-350 mpa.Math.s/25° C., a solid content of 48.0-54.0%, a density of 0.970-0.100 g/cm.sup.3 (20° C.), and pH 7.0-9.0.

Example 1

[0046] The environment-friendly impregnation solution of the invention, in percentage by weight, consisted of the following raw materials: 150 kg blocked isocyanate, 5 kg benzoxazine resin, 100 kg butadiene-vinylpyridine copylymer latex, 15 kg Auxiliary a (fatty alcohol polyoxyethylene ether), 25 kg Auxiliary b (sodium hexametaphosphate), and 705 kg demineralized water, wherein the total weight of the respective components was 1000 kg; the solid content of the obtained impregnation solution was 15.0%.

[0047] In this example, the benzoxazine resin was bisphenol A/aniline benzoxazine resin having the bisphenol A/aniline bicyclic structure.

Example 2

[0048] The environment-friendly impregnation solution of the invention, in percentage by weight, consisted of the following raw materials: 100 kg blocked isocyanate, 15 kg benzoxazine resin, 300 kg carboxylic styrene-butadiene latex, 15 kg Auxiliary a (fatty alcohol polyoxyethylene ether), 25 kg Auxiliary b (sodium hexametaphosphate), and 545 kg demineralized water, wherein the total weight of the respective components was 1000 kg; the solid content of the obtained impregnation solution was 24%.

[0049] In this example, the benzoxazine resin was phenol/MDA benzoxazine resin having the phenol/MDA bicyclic structure.

Example 3

[0050] The environment-friendly impregnation solution of the invention, in percentage by weight, consisted of the following raw materials: 50 kg blocked isocyanate, 15 kg benzoxazine resin, 300 kg butadiene-vinylpyridine copylymer latex, 15 kg Auxiliary a (fatty alcohol polyoxyethylene ether), 25 kg Auxiliary b (sodium hexametaphosphate), and 595 kg demineralized water, wherein the total weight of the respective components was 1000 kg; the solid content of the obtained impregnation solution was 18.0%.

[0051] In this example, the benzoxazine resin was bisphenol F/aniline benzoxazine resin having the bisphenol F/MDA bicyclic structure.

Example 4

[0052] The environment-friendly impregnation solution of the invention, in percentage by weight, consisted of the following raw materials: 50 kg blocked isocyanate, 60 kg benzoxazine resin, 500 kg carboxylic styrene-butadiene latex, 15 kg Auxiliary a (fatty alcohol polyoxyethylene ether), 25 kg Auxiliary b (sodium hexametaphosphate), and 350 kg demineralized water, wherein the total weight of the respective components was 1000 kg; the solid content of the obtained impregnation solution was 35.5%.

[0053] In this example, the benzoxazine resin was bisphenol F/aniline benzoxazine resin having the bisphenol F/MDA bicyclic structure.

Example 5

[0054] The environment-friendly impregnation solution of the invention, in percentage by weight, consisted of the following raw materials: 10 kg blocked isocyanate, 100 kg benzoxazine resin, 300 kg carboxylic styrene-butadiene latex, 15 kg Auxiliary a (fatty alcohol polyoxyethylene ether), 25 kg Auxiliary b (sodium hexametaphosphate), and 550 kg demineralized water, wherein the total weight of the respective components was 1000 kg; the solid content of the obtained impregnation solution was 30%.

[0055] In this example, the benzoxazine resin was bisphenol A/aniline benzoxazine resin having the bisphenol A/aniline bicyclic structure.

Example 6

[0056] The environment-friendly impregnation solution of the invention, in percentage by weight, consisted of the following raw materials: 150 kg blocked isocyanate, 5 kg benzoxazine resin, 100 kg EPDM, 15 kg Auxiliary a (fatty alcohol polyoxyethylene ether), 25 kg Auxiliary b (sodium hexametaphosphate), and 705 kg demineralized water, wherein the total weight of the respective components was 1000 kg; the solid content of the obtained impregnation solution was 15.0%.

[0057] In this example, the benzoxazine resin was bisphenol A/aniline benzoxazine resin having the bisphenol A/aniline bicyclic structure.

Example 7

[0058] The environment-friendly impregnation solution of the invention, in percentage by weight, consisted of the following raw materials: 100 kg blocked isocyanate, 15 kg benzoxazine resin, 300 kg EPDM, 15 kg Auxiliary a (fatty alcohol polyoxyethylene ether), 25 kg Auxiliary b (sodium hexametaphosphate), and 545 kg demineralized water, wherein the total weight of the respective components was 1000 kg; the solid content of the obtained impregnation solution was 24%.

[0059] In this example, the benzoxazine resin was bisphenol A/aniline benzoxazine resin having the bisphenol A/aniline bicyclic structure.

Example 8

[0060] The environment-friendly impregnation solution of the invention, in percentage by weight, consisted of the following raw materials: 50 kg blocked isocyanate, 15 kg benzoxazine resin, 300 kg EPDM, 15 kg Auxiliary a (fatty alcohol polyoxyethylene ether), 25 kg Auxiliary b (sodium hexametaphosphate), and 595 kg demineralized water, wherein the total weight of the respective components was 1000 kg; the solid content of the obtained impregnation solution was 21%.

[0061] In this example, the benzoxazine resin was bisphenol A/aniline benzoxazine resin having the bisphenol A/aniline bicyclic structure.

Example 9

[0062] The environment-friendly impregnation solution of the invention, in percentage by weight, consisted of the following raw materials: 50 kg blocked isocyanate, 60 kg benzoxazine resin, 500 kg butadiene-vinylpyridine copylymer latex, 15 kg Auxiliary a (fatty alcohol polyoxyethylene ether), 25 kg Auxiliary b (sodium hexametaphosphate), and 350 kg demineralized water, wherein the total weight of the respective components was 1000 kg; the solid content of the obtained impregnation solution was 31%.

[0063] In this example, the benzoxazine resin was phenol/MDA benzoxazine resin having the phenol/MDA bicyclic structure.

Example 10

[0064] The environment-friendly impregnation solution of the invention, in percentage by weight, consisted of the following raw materials: 10 kg blocked isocyanate, 100 kg benzoxazine resin, 300 kg styrene-butadiene latex, 15 kg Auxiliary a (fatty alcohol polyoxyethylene ether), 25 kg Auxiliary b (aqueous calcium stearate emulsion), and 550 kg demineralized water, wherein the total weight of the respective components was 1000 kg; the solid content of the obtained impregnation solution was 30%.

[0065] In this example, the benzoxazine resin was bisphenol A/aniline benzoxazine resin having the bisphenol A/aniline bicyclic structure.

Example 11

[0066] The environment-friendly impregnation solution of the invention, in percentage by weight, consisted of the following raw materials: 150 kg blocked isocyanate, 5 kg benzoxazine resin, 100 kg butadiene latex, 15 kg Auxiliary a (Tween 20), 25 kg Auxiliary b (sodium hexametaphosphate), and 705 kg demineralized water, wherein the total weight of the respective components was 1000 kg; the solid content of the obtained impregnation solution was 15.0%.

[0067] In this example, the benzoxazine resin was bisphenol A/aniline benzoxazine resin having the bisphenol A/aniline bicyclic structure.

Example 12

[0068] The environment-friendly impregnation solution of the invention, in percentage by weight, consisted of the following raw materials: 100 kg blocked isocyanate, 15 kg benzoxazine resin, 300 kg butadiene latex, 15 kg Auxiliary A (Tween 80), 25 kg Auxiliary B (sodium hexametaphosphate), and 545 kg demineralized water, wherein the total weight of the respective components was 1000 kg; the solid content of the obtained impregnation solution was 24%.

[0069] In this example, the benzoxazine resin was phenol/MDA benzoxazine resin having the phenol/MDA bicyclic structure.

Example 13

[0070] The environment-friendly impregnation solution of the invention, in percentage by weight, consisted of the following raw materials: 50 kg blocked isocyanate, 15 kg benzoxazine resin, 300 kg butadiene-vinylpyridine copylymer latex, 15 kg Auxiliary a (sodium diisobutyl naphthalene sulfonate), 25 kg Auxiliary b (aqueous calcium stearate emulsion), and 595 kg demineralized water, wherein the total weight of the respective components was 1000 kg; the solid content of the obtained impregnation solution was 18.0%.

[0071] In this example, the benzoxazine resin was bisphenol F/aniline benzoxazine resin having the bisphenol F/MDA bicyclic structure.

Example 14

[0072] The environment-friendly impregnation solution of the invention, in percentage by weight, consisted of the following raw materials: 50 kg blocked isocyanate, 60 kg benzoxazine resin, 500 kg butyronitrile latex, 15 kg Auxiliary a (Tween 20), 25 kg Auxiliary b (sodium hexametaphosphate), and 350 kg demineralized water, wherein the total weight of the respective components was 1000 kg; the solid content of the obtained impregnation solution was 35%.

[0073] In this example, the benzoxazine resin was bisphenol F/aniline benzoxazine resin having the bisphenol F/MDA bicyclic structure.

Example 15

[0074] The environment-friendly impregnation solution of the invention, in percentage by weight, consisted of the following raw materials: 10 kg blocked isocyanate, 100 kg benzoxazine resin, 300 kg carboxylic styrene-butadiene latex, 15 kg Auxiliary a (Tween 80), 25 kg Auxiliary b (sodium hexametaphosphate), and 550 kg demineralized water, wherein the total weight of the respective components was 1000 kg; the solid content of the obtained impregnation solution was 30%.

[0075] In this example, the benzoxazine resin was bisphenol A/aniline benzoxazine resin having the bisphenol A/aniline bicyclic structure.

[0076] The environment-friendly impregnation solutions of the invention in Examples 1-15 were prepared as follows:

[0077] a) firstly, weighing the respective raw materials in a ratio according to the formula of the environment-friendly impregnation solution described in any one of Examples 1-15;

[0078] b) adding the weighed blocked isocyanate and Auxiliary a into demineralized water and stirring uniformly to obtain Composition 1;

[0079] c) then adding Auxiliary b to the obtained Composition 1 and stirring uniformly to obtain Composition 2;

[0080] d) and adding special amino resin to the obtained Composition 2 and stirring uniformly, then grinding to obtain Composition 3 with a solid particle size less than 5 μm;

[0081] e) adding rubber latex to the obtained Composition 3, and stirring uniformly to obtain the environment-friendly impregnation solution, followed by packaging.

[0082] The comparison in the related properties between the environment-friendly impregnation solution of the invention obtained from any of Examples 1-15 and the existing traditional products was as follows:

[0083] Description of the impregnation method and materials in the examples: Examples 1-15 of the invention all adopted one-bath impregnation method. In order to ensure the consistency and comparability of the experimental data, in the existing product 1 used as a control sample, Dacron was used as the fiber framework material, which was completely the same as that in Examples 1-5 of the invention, and the impregnation solution was RFL system; in the existing product 2, Chinlon 66 was used as the fiber framework material, which was completely the same as that in Examples 6-10 of the invention, and the impregnation solution was RFL system; in the existing product 3, Chinlon 6 was used as the fiber framework material, which was completely the same as that in Examples 11-15 of the invention, and the impregnation solution was RFL system. Description of the test method of samples from the Examples: the cords impregnated with the impregnation solution of any of Examples 1-15 of the invention or with the existing products 1-3 were tested as follows: the dip pick-up was determined by dissolving the impregnated cord fabrics with a specific solvent according to GB/T30310-2013 method, and measuring the remaining solid amount; H adhesive force was determined by measuring the force required for pulling out single cord from a vulcanized rubber block according to GB/T2942-2009 method; the peel adhesion from surface was determined by peeling off the sample die blank made of impregnated cord fabrics and rubber at a constant speed by a tensile testing machine according to GB/T32109-2015 method, and the middle peak value of peeling force was the adhesive peeling strength; tensile properties were determined by, under specified conditions, fixing the impregnated cord on a CRE tensile machine, and applying a tensile force at a constant speed until the cord broken according to GB/T32108-2015 method; a dry heat shrinkage was determined by measuring the shrinkage of impregnated cord fabrics over a period of time under hot air at a constant temperature according to GB/T30312-2013 method.

[0084] The formulas and test results of the impregnation solutions of Examples 1-5 of the invention and the existing product 1 were shown in Table 1.

TABLE-US-00001 TABLE 1 Formulas and test results of the Impregnation solutions of Examples 1-5 and the existing product 1 Existing Gb product reference Item Example 1 Example 2 Example 3 Example 4 Example 5 1 value Fiber Dacron Dacron Dacron Dacron Dacron Dacron Chinion 66 (1440 dtex/2) (1440 dtex/2) (1440 dtex/2) (1440 dtex/2) (1440 dtex/2) (1440 dtex/2) (1400 dtex/2) Impregnation Demineralized 70.5%  54.5%  59.5%   35% 54% RFL solution water (resorcinol- formula Blocked  15%  10%   5%   5%  1% formaldehyde- isocyanate latex system) Special 0.5% 1.5% 1.5% 6.0% 10% amino resin Rubber latex  10%  30%  30%  50% 30% Auxiliary a 1.5% 1.5% 1.5% 1.5% 1.5%  Auxiliary b 2.5% 2.5% 2.5% 2.5% 2.5%  Solid content %  15%  24%  18% 35.5%  30% Dip pick-up/% 4.6 4.8 5.1 5.1 5.0 5.0 5.0 ± 1.0 H adhesive 137.2 142.4 146.3 147.5 147.2 147.1 High-class: force (N/1.0 cm) 147.0 First-class: 137.2 Qualified: 127.4 Adhesive peeling properties Tensile Breaking 201.7 209.4 215.4 216.8 217.2 215.9 High-class: properties strength/N≥ 215.6 test: First-class: 211.7 Qualified: 205.8 Elongation 18.7 19.0 19.2 19.2 19.3 19.1 19.0  at break/%≥ Constant-load 8.2 8.5 8.7 8.7 8.7 8.5 High-class: elongation/ 9.0 ± 0.6 % 66.6N First-class: 9.0 ± 0.8 Qualified: 9.0 ± 1.0 Variation 4.4 4.2 3.8 3.7 3.8 3.8 High-class: coefficient of 3.8 breaking First-class: strength/%≤ 4.8 Qualified: 5.8 Variation 6.5 6.3 6.2 6.3 6.3 6.2 High-class: coefficient of 6.3 elongation at First-class: break/%≤ 7.3 Qualified: 8.3 Dry heat 5.1 5.0 5.0 4.9 5.0 5.0 5.0 shrinkage/%<

[0085] The formulas and test results of the impregnation solutions of Examples 6-10 of the invention and the existing product 2 were shown in Table 2.

TABLE-US-00002 TABLE 2 Formulas and test results of the impregnation solutions of Examples 6-10 of the invention and the existing product 2 Item Gb Example Example Example Example Example Existing reference 6 7 8 9 10 product 2 value Fiber Chinlon 66 Chinion 66 Chinion 66 Chinion 66 Chinion 66 Chinion 66 Chinion 66 (1400 dtex/2) (1400 dtex/2) (1400 dtex/2) (1400 dtex/2) (1400 dtex/2) (1400 dtex/2) (1400 dtex/2) Impregnation Demineralized 70.5%  54.5%  59.5%  35% 54% RFL solution water (resorcinol- formula Blocked  15%  10% .sup. 5%  5%  1% formaldehyde- isocyanate latex Special 0.5% 1.5% 1.5% 6.0%  10% system) amino resin Rubber latex  10%  30%  30% 50% 30% Auxiliary a 1.5% 1.5% 1.5% 1.5%  1.5%  Auxiliary b 2.5% 2.5% 2.5% 2.5%  2.5%  Solid content/%  15%  24%  21% 31% 30% Dip pick-up/% 4.8 5.0 5.1 5.0 5.0 5.0 5.0 ± 1.0 H adhesive force (N/1.0 cm) 135    139    145    150    148    146    High-class: 147.0 First-class: 137.2 Qualified: 127.4 Adhesive peeling properties Tensile Breaking 185.7  199.2  217.0  219.4  216.3  216.1  High-class: properties strength/N≥ 215.6 test: First-class : 211.7 Qualified: 205.8 Elongation at 17.7  19.2  19.6  19.9  19.4  19.1  19.0 break/%≥ Constant-load 8.2 9.0 8.9 8.5 9.2 9.0 High-class: elongation/% 9.0 ± 0.6 66.6 N First-class: 9.0 ± 0.8 Qualified: 9.0 ± 1.0 Variation 3.8 4.3 3.7 3.9 3.6 3.8 High-class: coefficient 3.8 of breaking First-class : strength/%≤ 4.8 Qualified: 5.8 Variation 6.2 6.4 6.4 6.1 6.0 6.2 High-class: coefficient 6.3 of elongation First-class: at break/%≤ 7.3 Qualified: 8.3 Dry heat shrinkage/% < 5.0 5.0 4.9 5.0 4.8 5.0  5.0 150° C./30 min

[0086] The formulas and test results of the impregnation solutions of Examples 11-15 of the invention and the existing product 3 were shown in Table 3.

TABLE-US-00003 TABLE 3 Formulas and test results of the impregnation solutions of Examples 11-15 of the invention and the existing product 3 Item Gb Example Example Example Example Example Existing reference 11 12 13 14 15 product 3 value Fiber Chinion 6 Chinion 6 Chinion 6 Chinion 6 Chinion 6 Chinion 6 Chinion 6 (1400 dtex/2) (1400 dtex/2) (1400 dtex/2) (1400 dtex/2) (1400 dtex/2) (1400 dtex/2) (1400 dtex/2) Impregnation Demineralized 70.5%  54.5%  59.5%  35% 54% RFL solution water (resorcinol- formula Blocked  15%  10% .sup. 5%  5%  1% formaldehyde- isocyanate latex Special 0.5% 1.5% 1.5% 6.0%  10% system) amino resin Rubber latex  10%  30%  30% 50% 30% Auxiliary a 1.5% 1.5% 1.5% 1.5%  1.5%  Auxiliary b 2.5% 2.5% 2.5% 2.5%  2.5%  Solid content %  15%  24%  18% 35% 30% Dip pick-up/% 3.7 4.1 4.0 4.3 4.3 4.1 High-class: 4.2 ± 1.0 First-class: 4.2 ± 1.2 Qualified: 4.2 ± 1.2 H adhesive force (N/1.0 cm) 62   63   67   71   70   70 High-class: 70 First-class: 65 Qualified: 60 Adhesive peeling properties Tensile Breaking 92   99   105    109    110    108 High-class: properties strength/N> 107 test: First-class: 102 Qualified: 97 Elongation at break/%≥ Constant-load 8.3 8.6 8.6 8.4 8.4 8.3 High-class: elongation/% 8.0 ± 0.8 33.0 N First-class: 8.0 ± 1.0 Qualified: 8.0 ± 1.0 Variation 5.5 5.2 5.2 5.0 5.0 5.0 High-class: coefficient 5.0 of breaking First-class: strength/%< 6.0 Qualified: 6.5 Variation coefficient of elongation at break/%≤ Dry heat shrinkage/%< 4.7 4.5 4.5 4.4 4.4 4.4 4.5

[0087] The results in Table 1-3 showed that the impregnation solution of the invention without resorcinol, formaldehyde, and the like showed a good adhesive effect between Dacron cord and rubber, achieving the same adhesive level as the traditional RFL, and can completely substitute the RFL impregnation solution.

[0088] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention but not to limit the same; although the present invention has been described in detail with reference to the foregoing examples, those skilled in the art would understand that the technical solutions described in the foregoing examples can still be modified or some technical features can be equivalently substituted, and these modifications or substitutions do not make the essence of the corresponding technical solutions departing from the spirit and scope of the technical solutions of various embodiments of the present invention.

INDUSTRIAL APPLICABILITY

[0089] The invention provides an environment-friendly impregnation solution and a method for preparing the same. The environment-friendly impregnation solution comprises the following raw materials in percentage by weight: 1-15% of blocked isocyanate, 0.5-10% of special amino resin, 10-50% of rubber latex, 1-5% of auxiliaries, and the balance of water, wherein the sum of the weight percentage of each component is 100%. The impregnation solution of the invention does not contain toxic and harmful substances such as formaldehyde and resorcinol, and the preparation method thereof is simple, easy to operate, short in production cycle, and has a high safety factor, thus ensuring the impregnation solution preparation and impregnation processes are safe and environment-friendly.