Processes for improving the performance of GLR rubber adhesives based on alkylphenol resins

Abstract

This invention relates to the field of adhesive technology, specifically to a process for improving the performance of GLR rubber adhesive based on alkylphenol resin. The adhesive preparation method includes the following steps: S1, adding chloroprene rubber, carbon black, magnesium oxide, and zinc oxide into a mixer, adding benzoyl peroxide to the chloroprene rubber, and mixing to obtain a mixed rubber compound; S2, adding modified alkylphenol resin and a coupling agent into cyclohexanone to obtain mixture A; S3, cutting the mixed rubber compound into small pieces and adding it to xylene to obtain mixture B; S4, adding mixture A to mixture B to obtain the GLR rubber adhesive. The adhesive of this invention is made by combining modified alkylphenol resin and chloroprene rubber, which can reduce phase separation, improve interfacial adhesion, enhance the high-temperature stability of the adhesive, delay aging, and extend its service life.

Description

Technical Field

[0001] This invention relates to the field of rubber adhesive technology, and more specifically to a process for improving the performance of GLR rubber adhesives based on alkylphenol resins. Background Technology

[0002] Rubber adhesives are special chemicals made from natural or synthetic rubbers such as chloroprene rubber, nitrile rubber, and silicone rubber as base materials, supplemented with resins, plasticizers, vulcanizing agents, and other additives. They are mainly used to bond rubber to other materials such as metals, plastics, fibers, and leather, or to bond rubber to rubber.

[0003] Current rubber adhesives are prone to aging after long-term use, which reduces the bonding effect and may even cause them to lose their adhesiveness. When subjected to extreme conditions such as direct sunlight, high temperature, and low temperature, the rubber material is prone to deterioration, which causes the material to change in size and deform. After deformation, the distance between the bonded items increases and the bonding area decreases, resulting in a rapid decrease in bonding strength and affecting the service life of the bonded items. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a process for improving the performance of GLR rubber adhesives based on alkylphenol aldehyde resins.

[0005] The technical solution of this invention is: a process for improving the performance of GLR rubber adhesives based on alkylphenol resin, comprising the following steps:

[0006] S1. Add 80-100 parts of chloroprene rubber, 20-30 parts of carbon black, 4-8 parts of magnesium oxide and 2-5 parts of zinc oxide into a mixer and mix at 60-70°C for 15-20 minutes. Then add 1-3 parts of benzoyl peroxide into the mixer and continue mixing at 80-90°C for 5-10 minutes to obtain a mixed rubber compound.

[0007] S2. Add 30-40 parts of modified alkylphenol resin and 4-8 parts of coupling agent to 80-120 parts of cyclohexanone, heat to 40-50℃, and stir for 10-20 minutes to obtain mixture A.

[0008] S3. Cut the mixed rubber into small pieces with a diameter of 0.5-2cm, add them to 300-400 parts of xylene, and stir until the mixed rubber is completely dissolved to obtain mixture B;

[0009] S4. Divide mixture A into two equal parts. Heat mixture B to 30-40°C, add one part of mixture A to mixture B, keep warm for 5-10 minutes, add 3-6 parts of crosslinking agent to mixture B, then heat mixture B to 60-70°C, add the other part of mixture A to mixture B, and then stir for 40-60 minutes while keeping warm to obtain GLR rubber adhesive.

[0010] Note: The above adhesive is made by combining modified alkylphenol resin with chloroprene rubber. Modified alkylphenol resin and chloroprene rubber have good compatibility, which can reduce phase separation, thereby improving interfacial adhesion and ensuring the adhesive strength. In addition, modified alkylphenol resin can improve the high temperature stability of the adhesive, delay the aging of the adhesive, and extend its service life.

[0011] Furthermore, the particle size of the carbon black is 10-50 nm.

[0012] Note: Carbon black with the above particle size can be uniformly dispersed in chloroprene rubber and bond well with chloroprene rubber, thereby improving the bonding strength.

[0013] Furthermore, the crosslinking agent is an isocyanate or a polyamide.

[0014] Note: The above crosslinking agent can promote the chemical bonding between the molecular chains of the adhesive and form a crosslinked network structure, which greatly improves the cohesive force and peel strength of the adhesive.

[0015] Furthermore, the coupling agent is aminopropyltriethoxysilane or methacryloxypropyltrimethoxysilane.

[0016] Note: The organic functional groups of the above coupling agent can connect phenolic resin and chloroprene rubber to form a three-dimensional bridging structure, thereby improving the interfacial bonding strength.

[0017] Furthermore, the preparation method of the modified alkylphenol resin is as follows:

[0018] 1) Add nonylphenol and sodium hydroxide to anhydrous ethanol and stir for 10-15 minutes to obtain mixture C; wherein the mass ratio of nonylphenol, sodium hydroxide and anhydrous ethanol is 1:1.2-1.5:3-5.

[0019] 2) Heat mixture C to 60-70°C, then add 1,2-dibromoethane dropwise to mixture C. After the addition is complete, heat mixture C to 80-90°C and reflux for 4-6 hours. After the reaction is complete, extract and distill under reduced pressure to obtain halononylphenol. The mass ratio of mixture C to 1,2-dibromoethane is 1:0.06-0.1.

[0020] 3) Add halononylphenol and part of formaldehyde solution to ethanol solution, then use 2-5% dilute hydrochloric acid to adjust the pH of ethanol solution to 2-3, heat ethanol solution to 70-80℃ in a closed environment and keep warm for 2 hours to obtain prepolymer;

[0021] 4) Add the remaining formaldehyde solution and dimethylamine solution to the prepolymer, then heat the prepolymer to 60-70°C and stir for 3-5 hours. After cooling, adjust the pH of the prepolymer to 7-8 using a 5-10% sodium hydroxide solution. Then, purify the prepolymer by vacuum distillation to obtain the modified alkylphenol resin.

[0022] The mass ratio of halogenated nonylphenol, formaldehyde solution, dimethylamine solution and ethanol solution is 1:1.2-1.5:1-1.2:3-4, the formaldehyde solution accounts for 70-80% of the total mass of the formaldehyde solution, and the ethanol solution has a mass concentration of 50-60%.

[0023] Explanation: The above-mentioned modified alkylphenol resin is generated by reacting nonylphenol with 1,2-dibromoethane to produce halononylphenol, followed by reacting halononylphenol with formaldehyde to generate a linear phenolic resin skeleton. Then, a nucleophilic substitution reaction is carried out between dimethylamine solution and halononylphenol to graft tertiary amine groups onto the linear phenolic resin skeleton. This enables the modified alkylphenol resin to have good compatibility with chloroprene rubber, reduces phase separation, and the tertiary amine groups can inhibit free radical chain reactions, thereby improving the high-temperature stability and anti-aging properties of the adhesive.

[0024] Furthermore, ethyl acetate is used as the extractant during the extraction process.

[0025] Note: Using ethyl acetate as an extractant can effectively separate the organic phase from the aqueous phase and reduce impurities in the mixture C.

[0026] Furthermore, the formaldehyde solution has a mass concentration of 30-40%, and the dimethylamine solution has a mass concentration of 25-30%.

[0027] Note: The formaldehyde solution and dimethylamine solution of the above mass concentration can fully participate in the reaction, reducing the generation of by-products.

[0028] Furthermore, the purification method is as follows: the prepolymer after vacuum distillation is dissolved in anhydrous ethanol at a concentration of 3 to 4 times its mass, and then the anhydrous ethanol is added dropwise into ice water to precipitate it.

[0029] Note: The above purification method can improve the purity of modified alkylphenol resin and remove unreacted substances and byproducts in the prepolymer.

[0030] The beneficial effects of this invention are:

[0031] (1) The adhesive of the present invention is made by combining modified alkylphenol resin and chloroprene rubber. The modified alkylphenol resin and chloroprene rubber have good compatibility, which can reduce phase separation, thereby improving the interfacial adhesion, ensuring the adhesive strength, improving the high temperature stability of the adhesive, delaying the aging of the adhesive, and extending the service life.

[0032] (2) In this invention, nonylphenol is reacted with 1,2-dibromoethane to generate halo-nonylphenol, and then the halo-nonylphenol is reacted with formaldehyde to generate a linear phenolic resin skeleton. Then, a nucleophilic substitution reaction is carried out between dimethylamine solution and halo-nonylphenol to graft tertiary amine groups onto the linear phenolic resin skeleton, so that the modified alkyl phenolic resin can be well compatible with chloroprene rubber, reducing phase separation. Moreover, the tertiary amine groups can inhibit free radical chain reactions, effectively improving the high temperature stability and anti-aging properties of the adhesive. Detailed Implementation

[0033] To further illustrate the methods and effects of this invention, the technical solution of this invention will be clearly and completely described below in conjunction with experiments.

[0034] Example 1: A process for improving the performance of GLR rubber adhesives based on alkylphenol resin, comprising the following steps:

[0035] S1. Add 90 parts of chloroprene rubber, 25 parts of carbon black, 6 parts of magnesium oxide and 4 parts of zinc oxide into a mixer and mix at 65°C for 18 minutes. Then add 2 parts of benzoyl peroxide into the mixer and continue mixing at 85°C for 8 minutes to obtain a mixed rubber compound.

[0036] S2. Add 35 parts of modified alkylphenol resin and 6 parts of coupling agent to 100 parts of cyclohexanone, heat to 45°C, and stir for 15 minutes to obtain mixture A.

[0037] S3. Cut the mixed rubber into small pieces with a diameter of 0.5-2cm, add them to 350 parts of xylene, and stir until the mixed rubber is completely dissolved to obtain mixture B;

[0038] S4. Divide mixture A into two equal parts. Heat mixture B to 35°C, add one part of mixture A to mixture B, keep it warm for 8 minutes, add 4 parts of crosslinking agent to mixture B, then heat mixture B to 65°C, add the other part of mixture A to mixture B, and then stir for 50 minutes while keeping it warm to obtain GLR rubber adhesive.

[0039] Preparation method of modified alkylphenol resin:

[0040] 1) Nonylphenol and sodium hydroxide were added to anhydrous ethanol and stirred for 12 minutes to obtain mixture C; wherein the mass ratio of nonylphenol, sodium hydroxide and anhydrous ethanol was 1:1.3:4.

[0041] 2) Heat mixture C to 65°C, then add 1,2-dibromoethane dropwise to mixture C. After the addition is complete, raise the temperature of mixture C to 85°C and reflux for 5 hours. After the reaction is complete, extract and distill under reduced pressure to obtain halononylphenol. The mass ratio of mixture C to 1,2-dibromoethane is 1:0.08. Ethyl acetate is used as the extractant.

[0042] 3) Add halononylphenol and part of formaldehyde solution to 55% ethanol solution, then adjust the pH of ethanol solution to 2.5 with 4% dilute hydrochloric acid. Heat ethanol solution to 75°C in a closed environment and keep warm for 2 hours to obtain prepolymer.

[0043] 4) Add the remaining formaldehyde solution and dimethylamine solution to the prepolymer, then heat the prepolymer to 65°C and stir for 4 hours. After cooling, adjust the pH of the prepolymer to 7.5 using an 8% sodium hydroxide solution. Then, perform vacuum distillation on the prepolymer to purify it and obtain the modified alkylphenol resin.

[0044] The mass ratio of halogenated nonylphenol, formaldehyde solution, dimethylamine solution and ethanol solution is 1:1.3:1.1:3.5, with the formaldehyde solution accounting for 75% of the total mass of the formaldehyde solution; the mass concentration of the ethanol solution is 55%, the mass concentration of the formaldehyde solution is 35%, and the mass concentration of the dimethylamine solution is 28%.

[0045] The purification method is as follows: the prepolymer after vacuum distillation is dissolved in anhydrous ethanol at a ratio of 3.5 times its mass, and then the anhydrous ethanol is added dropwise into ice water to precipitate it.

[0046] Example 2: This example is basically the same as Example 1, except that the adhesive is made from the following raw materials: 80 parts chloroprene rubber, 20 parts carbon black, 4 parts magnesium oxide, 2 parts zinc oxide, 1 part benzoyl peroxide, 30 parts modified alkylphenol resin, 4 parts coupling agent, 80 parts cyclohexanone, 300 parts xylene, and 3 parts crosslinking agent.

[0047] Example 3: This example is basically the same as Example 1, except that the adhesive is made from the following raw materials: 100 parts chloroprene rubber, 30 parts carbon black, 8 parts magnesium oxide, 5 parts zinc oxide, 3 parts benzoyl peroxide, 40 parts modified alkylphenol resin, 8 parts coupling agent, 120 parts cyclohexanone, 400 parts xylene, and 6 parts crosslinking agent.

[0048] Example 4: This example is basically the same as Example 1, except that after heating the mixture B to 30°C, an equal part of the mixture A is added to the mixture B.

[0049] Example 5: This example is basically the same as Example 1, except that after heating the mixture B to 40°C, an equal part of the mixture A is added to the mixture B.

[0050] Example 6: This example is basically the same as Example 1, except that the mixture B is heated to 60°C and another equal part of the mixture A is added to the mixture B.

[0051] Example 7: This example is basically the same as Example 1, except that the mixture B is heated to 70°C and another equal part of the mixture A is added to the mixture B.

[0052] Example 8: This example is basically the same as Example 1, except that the mass ratio of nonylphenol, sodium hydroxide and anhydrous ethanol is 1:1.2:3.

[0053] Example 9: This example is basically the same as Example 1, except that the mass ratio of nonylphenol, sodium hydroxide and anhydrous ethanol is 1:1.5:5.

[0054] Example 10: This example is basically the same as Example 1, except that the mass ratio of mixture C to 1,2-dibromoethane is 1:0.06.

[0055] Example 11: This example is basically the same as Example 1, except that the mass ratio of mixture C to 1,2-dibromoethane is 1:0.1.

[0056] Example 12: This example is basically the same as Example 1, except that the mass ratio of halogenated nonylphenol, formaldehyde solution, dimethylamine solution and ethanol solution is 1:1.2:1:3.

[0057] Example 13: This example is basically the same as Example 1, except that the mass ratio of halogenated nonylphenol, formaldehyde solution, dimethylamine solution and ethanol solution is 1:1.5:1.2:4.

[0058] Example 14: This example is basically the same as Example 1, except that the formaldehyde solution accounts for 70% of the total mass of the formaldehyde solution.

[0059] Example 15: This example is basically the same as Example 1, except that the formaldehyde solution accounts for 80% of the total mass of the formaldehyde solution.

[0060] Comparative Example 1: Referring to Example 1, the modified alkylphenol resin was replaced with alkylphenol resin.

[0061] Comparative Example 2: Referring to Example 1, all of the mixture A was added to the mixture B at once.

[0062] Comparative Example 3: Referring to Example 1, the formaldehyde solution was added to the ethanol solution all at once.

[0063] Experimental Example: To investigate the performance of the adhesives prepared in each embodiment and comparative example, the adhesives of each embodiment and comparative example were applied to steel plates with an area of ​​25mm × 25mm and a thickness of 0.2mm. Rubber sheets were bonded to the coated areas, and the adhesives were cured at 120℃ for 30 minutes. After standing for 24 hours, samples of each embodiment were obtained, and the peel strength of each sample was tested. Subsequently, the samples of each embodiment were aged at 140℃ for 100 hours. The decrease rate of peel strength before and after aging was calculated. The specific investigation is as follows:

[0064] Experiment Example 1: Investigating the effect of adhesive composition on adhesive properties

[0065] Using Examples 1, 2, and 3, as well as Comparative Example 1, as experimental comparisons, the adhesive properties under different compositions are shown in Table 1 below:

[0066] Table 1 Adhesive properties under different compositions

[0067] Group Peel strength (KN / m) Peel strength reduction rate Example 1 12.7 6.2％ Example 2 12.4 7.0％ Example 3 12.5 6.7％ Comparative Example 1 10.1 13.6％

[0068] As shown in Table 1, compared with Examples 1, 2 and 3, the sample of Example 1 had the highest peel strength and the lowest peel strength decrease rate, indicating that the adhesive of Example 1 had the highest bonding strength and the best anti-aging performance. This may be because the modified alkylphenol resin in the adhesive composition of Example 1 can fully crosslink with chloroprene rubber. Therefore, the adhesive composition selected in Example 1 is the optimal one.

[0069] Compared with Comparative Example 1, in Example 1, after replacing the modified alkylphenol resin with alkylphenol resin, the anti-aging performance of the adhesive decreased significantly. This indicates that the modified alkylphenol resin can improve the anti-aging performance of the adhesive and extend its service life.

[0070] Experiment Example 2: Investigating the effect of temperature on the properties of the adhesive when adding mixture B.

[0071] Using Examples 1, 4, 5, 6, and 7, as well as Comparative Example 2, as experimental comparisons, the adhesive properties of mixture B at different temperatures are shown in Table 2 below:

[0072] Table 2 Adhesive properties of Mixture B at different temperatures

[0073] Group Peel strength (KN / m) Peel strength reduction rate Example 1 12.7 6.2％ Example 4 11.8 7.4％ Example 5 12.3 6.9％ Example 6 12.1 7.1％ Example 7 12.4 6.7％ Comparative Example 2 11.2 9.5％

[0074] As shown in Table 2, compared with Examples 1, 4, 5, 6, and 7, the sample of Example 1 had the highest peel strength and the lowest peel strength decrease rate, indicating that the adhesive of Example 1 had the highest bonding strength and the best anti-aging performance. This may be because the components of the adhesive were mixed most evenly at the temperature of the mixture B selected in Example 1. Therefore, the temperature of the mixture B selected in Example 1 was the optimal.

[0075] Compared with Comparative Example 2, in Example 1, the anti-aging properties of the adhesive decreased significantly after all of the mixture A was added to the mixture B at once. This may be because the modified alkylphenol resin and chloroprene rubber were not fully compatible. Therefore, the addition method of mixture A selected in Example 1 was the optimal one.

[0076] Experiment Example 3: Investigating the effect of the mixture C ratio on the adhesive properties.

[0077] Using Examples 1, 8, and 9 as comparative experiments, the adhesive properties of different proportions of mixture C are shown in Table 3 below:

[0078] Table 3 Adhesive properties of mixture C under different proportions

[0079] Group Peel strength (KN / m) Peel strength reduction rate Example 1 12.7 6.2％ Example 8 12.3 6.6％ Example 9 12.0 6.8％

[0080] As shown in Table 3, compared with Examples 1, 8, and 9, the sample of Example 1 had the highest peel strength and the lowest peel strength decrease rate, indicating that the adhesive of Example 1 had the highest bonding strength and the best anti-aging performance. This may be because the purity of halogenated nonylphenol was the highest and the number of byproducts was the fewest under the mixed liquid C ratio selected in Example 1. Therefore, the mixed liquid C ratio selected in Example 1 was the optimal one.

[0081] Experiment Example 4: Investigating the effect of 1,2-dibromoethane addition amount on adhesive properties.

[0082] Using Examples 1, 10, and 11 as comparative experiments, the adhesive properties at different addition amounts of 1,2-dibromoethane are shown in Table 4 below:

[0083] Table 4 Adhesive properties at different addition levels of 1,2-dibromoethane

[0084] Group Peel strength (KN / m) Peel strength reduction rate Example 1 12.7 6.2％ Example 10 11.9 7.2％ Example 11 12.1 6.8％

[0085] As shown in Table 4, compared with Examples 1, 10, and 11, the sample of Example 1 had the highest peel strength and the lowest rate of decrease in peel strength. This indicates that the adhesive of Example 1 had the highest bonding strength and the best anti-aging performance. This may be because the reaction between nonylphenol and 1,2-dibromoethane was most complete at the amount of 1,2-dibromoethane added selected in Example 1. Therefore, the amount of 1,2-dibromoethane added selected in Example 1 was optimal.

[0086] Experiment Example 5: Investigating the effect of prepolymer composition on adhesive properties

[0087] Using Examples 1, 12, and 13 as comparative experiments, the adhesive properties of prepolymers with different compositions are shown in Table 5 below:

[0088] Table 5 Adhesive properties of prepolymers with different compositions

[0089] Group Peel strength (KN / m) Peel strength reduction rate Example 1 12.7 6.2％ Example 12 11.6 7.3％ Example 13 11.9 7.0％

[0090] As shown in Table 5, compared with Examples 1, 12, and 13, the sample of Example 1 had the highest peel strength and the lowest peel strength decrease rate, indicating that the adhesive of Example 1 had the highest bonding strength and the best anti-aging performance. This may be because the alkylphenol resin skeleton of Example 1 can be fully grafted with tertiary amine groups under the prepolymer composition selected, so the prepolymer composition selected in Example 1 is the optimal one.

[0091] Experiment Example 6: Investigating the effect of the initial amount of formaldehyde solution added on the performance of adhesives.

[0092] Using Examples 1, 14, 15 and Comparative Example 3 as experimental comparisons, the adhesive performance under different initial addition amounts of formaldehyde solution is shown in Table 6 below:

[0093] Table 6 Adhesive performance under different initial addition amounts of formaldehyde solution.

[0094] Group Peel strength (KN / m) Peel strength reduction rate Example 1 12.7 6.2％ Example 14 12.4 6.5％ Example 15 12.0 6.8％ Comparative Example 3 10.8 11.4％

[0095] As shown in Table 6, compared with Examples 1, 12 and 13, the sample of Example 1 had the highest peel strength and the lowest peel strength decrease rate, indicating that the adhesive of Example 1 had the highest bonding strength and the best anti-aging performance. This may be because the alkylphenol resin skeleton had sufficient active sites for grafting tertiary amine groups at the initial addition amount of formaldehyde solution selected in Example 1. Therefore, the initial addition amount of formaldehyde solution selected in Example 1 was optimal.

[0096] Compared with Comparative Example 3, in Example 1, the anti-aging properties of the adhesive decreased significantly after all the formaldehyde solution was added to the ethanol solution at once. This may be because the tertiary amine groups were not fully grafted onto the alkylphenol resin after all the formaldehyde solution was added to the ethanol solution at once. Therefore, the formaldehyde solution addition method selected in Example 1 was optimal.

Claims

1. A process for improving the performance of GLR rubber adhesives based on alkylphenol resin, characterized in that, Includes the following steps: S1. Add 80-100 parts of chloroprene rubber, 20-30 parts of carbon black, 4-8 parts of magnesium oxide and 2-5 parts of zinc oxide into a mixer and mix at 60-70°C for 15-20 minutes. Then add 1-3 parts of benzoyl peroxide into the mixer and continue mixing at 80-90°C for 5-10 minutes to obtain a mixed rubber compound. S2. Add 30-40 parts of modified alkylphenol resin and 4-8 parts of coupling agent to 80-120 parts of cyclohexanone, heat to 40-50℃, and stir for 10-20 minutes to obtain mixture A. S3. Cut the mixed rubber into small pieces with a diameter of 0.5-2cm, add them to 300-400 parts of xylene, and stir until the mixed rubber is completely dissolved to obtain mixture B; S4. Divide mixture A into two equal parts. Heat mixture B to 30-40°C. Add one part of mixture A to mixture B and keep it warm for 5-10 minutes. Then add 3-6 parts of crosslinking agent to mixture B. Heat mixture B to 60-70°C and add the other part of mixture A to mixture B. Stir for 40-60 minutes while keeping it warm to obtain GLR rubber adhesive. The preparation method of the modified alkylphenol resin: 1) Add nonylphenol and sodium hydroxide to anhydrous ethanol and stir for 10-15 minutes to obtain mixture C; wherein the mass ratio of nonylphenol, sodium hydroxide and anhydrous ethanol is 1:1.2-1.5:3-5. 2) Heat mixture C to 60-70°C, then add 1,2-dibromoethane dropwise to mixture C. After the addition is complete, heat mixture C to 80-90°C and reflux for 4-6 hours. After the reaction is complete, extract and distill under reduced pressure to obtain halononylphenol. The mass ratio of mixture C to 1,2-dibromoethane is 1:0.06-0.

1. 3) Add halononylphenol and part of formaldehyde solution to ethanol solution, then use 2-5% dilute hydrochloric acid to adjust the pH of ethanol solution to 2-3, heat ethanol solution to 70-80℃ in a closed environment and keep warm for 2 hours to obtain prepolymer; 4) Add the remaining formaldehyde solution and dimethylamine solution to the prepolymer, then heat the prepolymer to 60-70°C and stir for 3-5 hours. After cooling, adjust the pH of the prepolymer to 7-8 using a 5-10% sodium hydroxide solution. Then, purify the prepolymer by vacuum distillation to obtain the modified alkylphenol resin. The mass ratio of halogenated nonylphenol, formaldehyde solution, dimethylamine solution and ethanol solution is 1:1.2-1.5:1-1.2:3-4, the formaldehyde solution accounts for 70-80% of the total mass of the formaldehyde solution, and the ethanol solution has a mass concentration of 50-60%.

2. The process for improving the performance of GLR rubber adhesives based on alkylphenol resin according to claim 1, characterized in that, The carbon black has a particle size of 10-50 nm.

3. The process for improving the performance of GLR rubber adhesives based on alkylphenol resin according to claim 1, characterized in that, The crosslinking agent is isocyanate or polyamide.

4. The process for improving the performance of GLR rubber adhesives based on alkylphenol resin according to claim 1, characterized in that, The coupling agent is aminopropyltriethoxysilane or methacryloyloxypropyltrimethoxysilane.

5. The process for improving the performance of GLR rubber adhesives based on alkylphenol resin according to claim 1, characterized in that, Ethyl acetate was used as the extractant during the extraction process.

6. The process for improving the performance of GLR rubber adhesives based on alkylphenol resin according to claim 1, characterized in that, The formaldehyde solution has a mass concentration of 30-40%, and the dimethylamine solution has a mass concentration of 25-30%.

7. The process for improving the performance of GLR rubber adhesives based on alkylphenol resin according to claim 1, characterized in that, The purification method is as follows: the prepolymer after vacuum distillation is dissolved in anhydrous ethanol at a mass of 3 to 4 times its weight, and then the anhydrous ethanol is added dropwise into ice water to precipitate.