Anti-fatigue rubber material and preparation method thereof

Abstract

The invention relates to the technical field of rubber materials, and discloses an anti-fatigue rubber material and a preparation method thereof.According to the rubber material, ethylene propylene diene monomer with good anti-fatigue performance serves as a main base material, and meanwhile, auxiliaries such as carbon black, modified spandex short fibers and a modified anti-aging agent are added to achieve a synergistic effect; and the anti-fatigue performance and the anti-aging performance of the matrix are improved. The carbon black is dispersed in the matrix as a main filler, so that the anti-fatigue performance of the matrix is improved; the modified spandex fiber plays a role of a reinforcing body in a rubber matrix, so that the anti-fatigue performance of the matrix is improved; and the modified anti-aging agent can delay or inhibit fatigue aging of the rubber in a matrix, and has an anti-aging effect.

Description

Technical Field

[0001] The invention relates to the technical field of rubber materials, and in particular to an anti-fatigue rubber material and a preparation method thereof. Background Art

[0002] As one of the three important polymer materials, rubber material has unique viscoelasticity, low elastic modulus and large reversible deformation characteristics, and has important applications in transportation, sealing protection, shock absorption and damping, etc. In actual use, rubber products need to withstand quasi-static or periodic dynamic loads for a long time. Long-term use will cause fatigue damage to rubber products, and sudden failure will bring serious consequences, such as high-speed car tire blowout leading to traffic accidents, fatigue fracture failure of train elastic components leading to derailment, elastic sealing ring failure leading to sealing medium leakage, etc.

[0003] In order to avoid the huge losses caused by fatigue damage to rubber products, people need to select a suitable rubber matrix and modify the rubber material to improve the fatigue resistance of the rubber material. EPDM rubber has good fatigue resistance and can maintain a long service life under repeated stress. This rubber material has high elasticity and good resilience, and can quickly return to its original state after multiple deformations, reducing material damage caused by fatigue. Its fatigue resistance can also be further improved by adding appropriate fillers and additives. Therefore, EPDM rubber is used as the matrix and modified to improve its fatigue resistance to meet actual needs, reduce maintenance or replacement, reduce the cost of use, and improve the durability and safety of rubber products. Summary of the invention

[0004] The object of the present invention is to provide an anti-fatigue rubber material and a preparation method thereof, so as to solve the general problem of the anti-fatigue performance of the existing rubber materials mentioned in the background technology.

[0005] The present invention can be implemented by the following technical solutions: An anti-fatigue rubber material comprises the following raw materials in parts by weight: 60-80 parts of EPDM rubber, 15-25 parts of carbon black, 5-10 parts of modified spandex staple fibers, 1-3 parts of modified antioxidants, 2.5-4.5 parts of vulcanizing agents, 0.1-0.5 parts of vulcanization accelerators, and 0.5-1 parts of antioxidants; Furthermore, the vulcanizing agent is a dipentadienyl vulcanizing agent, the vulcanization accelerator is a vulcanization accelerator TMPTMA, and the antioxidant is an antioxidant 1010; The modified spandex staple fiber is prepared by the following steps: Step A1, 4-maleimidobenzoic acid is mixed with N,N-dimethylformamide, thionyl chloride and tert-butylcatechol are added, refluxed for 2 hours, and distilled under reduced pressure and recrystallized to obtain a maleimide derivative; Further, in step A1, the usage ratio of 4-maleimidobenzoic acid, N,N-dimethylformamide, thionyl chloride and tert-butylcatechol is 0.15-0.3 mol: 200 mL: 4-8 mol: 0.01-0.02 g; Step A2, after mixing borax and deionized water, nitrogen is introduced, dopamine hydrochloride is added and stirred for 20 minutes, sodium carbonate is added, and then the maleimide derivative is slowly added in an ice water bath, stirred for 5-8 hours, the pH of the system is adjusted to 1-2, extraction, drying and recrystallization are performed to obtain a dopamine-maleic anhydride derivative; Further, in step A2, the usage ratio of borax, deionized water, dopamine hydrochloride, sodium carbonate and maleimide derivative is 3.8-7.2 g: 100 mL: 1.9-3.8 g: 1.1-2.2 g: 2.36-4.72 g; Step A3, dopamine-maleic anhydride derivative and dopamine hydrochloride are mixed evenly in 0.01 mol / L Tris buffer (pH 8.5), spandex staple fibers are added, and the temperature is maintained at 25-35° C., and the reaction is stirred for 12 hours, filtered, washed, and dried to obtain modified spandex staple fibers; Furthermore, in step A3, the dosage ratio of dopamine-maleic anhydride derivative, dopamine hydrochloride, Tris buffer and spandex staple fiber is 2-4 g: 0.75-1.5 g: 100 mL: 3-6 g.

[0006] The modified antioxidant is prepared by the following steps: Step B1, diethyl hydroxymethyl phosphate, triethylamine and dichloromethane are mixed, and stirred in an ice-water bath for 30 minutes, and then a dichloromethane solution of 4-aminobenzoyl chloride is added, stirred and reacted for 40-60 minutes, and then the temperature is raised to 35° C. to react for 10-12 hours, washed with water, rotary evaporated, purified, and rotary evaporated again to obtain a phosphate derivative; Further, in step B1, the usage ratio of diethyl hydroxymethyl phosphate, triethylamine, dichloromethane and 4-aminobenzoyl chloride dichloromethane solution is 0.01-0.03 mol: 0.01-0.03 mol: 100 mL: 10 mL; Further, the 4-aminobenzoyl chloride dichloromethane solution is prepared by mixing and stirring 1.4-4.2 g of 4-aminobenzoyl chloride dichloromethane and 10 mL of dichloromethane; Step B2, mixing a phosphate derivative, dibutyltin dilaurate and ethanol, adding allyl isothiocyanate under stirring conditions, and heating to 45-55° C., reacting for 3.5-4.5 hours, filtering, washing and drying to obtain a modified antioxidant; Furthermore, in step B2, the usage ratio of the phosphate derivative, dibutyltin dilaurate, ethanol and allyl isothiocyanate is 2.9-8.7 g: 0.03-0.09 g: 100 mL: 1-3 g.

[0007] A method for preparing an anti-fatigue rubber material comprises the following steps: Step S1, weighing raw materials by weight, mixing EPDM rubber, modified antioxidant, antioxidant, vulcanizing agent and vulcanization accelerator in an internal mixer for 3-5 minutes to obtain a premixed rubber; Step S2, mixing carbon black, modified spandex staple fiber and premixed rubber for 5-10 minutes, pressurizing and mixing to a temperature of 130-150°C, draining the rubber, cooling, and standing for 24 hours, then putting them into an internal mixer, pressurizing and mixing to 110-120°C, draining the rubber, cooling, and standing for 24 hours to obtain an anti-fatigue rubber material.

[0008] Beneficial effects of the present invention: The rubber material of the present invention is mainly based on EPDM rubber with good anti-fatigue performance, and carbon black, modified spandex short fibers, modified antioxidants and other additives are added at the same time, which synergistically improve the anti-fatigue performance and anti-aging performance of the matrix. Carbon black is dispersed in the matrix as the main filler, which improves the anti-fatigue performance of the matrix; the modified spandex fiber plays the role of a reinforcement in the rubber matrix, which improves the anti-fatigue performance of the matrix; and the modified antioxidant can delay or inhibit the fatigue aging of the rubber in the matrix, and has an anti-aging effect.

[0009] The polydopamine derivative coated on the surface of the modified spandex fiber can improve the dispersion of the fiber in the matrix, and at the same time has a flexible interface effect, acting as a bridge between the fiber and the rubber matrix, which can effectively transfer stress to the fiber, hinder the generation and development of cracks in the rubber matrix, and make the fiber act as a reinforcement, thereby improving the fatigue resistance of the matrix; the double bonds on the fiber surface can also participate in the matrix vulcanization reaction to form covalent bonds, so that the fiber is firmly fixed in the matrix and enhances the fatigue resistance of the matrix. In addition, the fiber surface introduces a heat-resistant imide group, which can improve the heat resistance of the matrix, effectively reduce the physical performance degradation and fatigue damage caused by thermal fatigue in a high temperature environment, thereby improving the fatigue resistance of the matrix; it also introduces a catechol structure with anti-aging effect, which can effectively inhibit or delay the aging of the rubber matrix and extend the service life of the rubber material.

[0010] Phosphate groups are introduced into the modified antioxidant, which can react with rubber molecules in the rubber matrix to form chemical bonds, thereby extending the service life of rubber products and indirectly improving the fatigue resistance of rubber materials. Thiourea structures are also introduced, and the thiourea structure can act as a vulcanization accelerator to accelerate the vulcanization rate of rubber and reduce the energy consumption during the vulcanization process. At the same time, the thiourea group can also remove active free radicals in the rubber matrix, delaying or inhibiting fatigue aging of the matrix. In addition, the terminal double bond structure in the modified antioxidant can also participate in the rubber vulcanization process, combining the modified antioxidant to the rubber molecular chain, improving the migration resistance of the antioxidant, and thus giving the rubber material a continuous anti-aging ability. DETAILED DESCRIPTION

[0011] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0012] Example 1: Modified spandex staple fibers are prepared by the following steps: Step A1, 0.15 mol of 4-maleimidobenzoic acid was mixed in 200 mL of N,N-dimethylformamide, 4 mol of thionyl chloride and 0.01 g of tert-butylcatechol were added, refluxed for 2 h, and distilled under reduced pressure and recrystallized to obtain a maleimide derivative; Step A2, after mixing 3.8 g of borax and 100 mL of deionized water, nitrogen was introduced, and then 1.9 g of dopamine hydrochloride was added and stirred for 20 min, and then 1.1 g of sodium carbonate was added, and then 2.36 g of maleimide derivative was slowly added in an ice water bath, and the reaction was stirred for 5 h. The pH of the system was adjusted to 1, and the dopamine-maleic anhydride derivative was obtained by extraction, drying, and recrystallization; Step A3: Mix 2 g of dopamine-maleic anhydride derivative and 0.75 g of dopamine hydrochloride in 100 mL of 0.01 mol / L Tris buffer (pH 8.5), add 3 g of spandex staple fiber, maintain the temperature at 25°C, stir and react for 12 h, filter, wash and dry to obtain modified spandex staple fiber.

[0013] The modified antioxidant is prepared by the following steps: Step B1, 0.01 mol of diethyl hydroxymethyl phosphate, 0.01 mol of triethylamine and 100 mL of dichloromethane are mixed and stirred in an ice-water bath for 30 min, and then 10 mL of 4-aminobenzoyl chloride dichloromethane solution is added and stirred for 40 min, and then the temperature is raised to 35° C. for 10 h, washed with water, rotary evaporated, purified, and rotary evaporated again to obtain a phosphate derivative. The 4-aminobenzoyl chloride dichloromethane solution is prepared by mixing and stirring 1.4-4.2 g of 4-aminobenzoyl chloride dichloromethane and 10 mL of dichloromethane; Step B2: Mix 2.9 g of a phosphate derivative, 0.03 g of dibutyltin dilaurate and 100 mL of ethanol, add 1 g of allyl isothiocyanate under stirring conditions, raise the temperature to 45°C, react for 3.5 h, filter, wash and dry to obtain a modified antioxidant.

[0014] Example 2: Modified spandex staple fibers are prepared by the following steps: Step A1, 0.23 mol of 4-maleimidobenzoic acid was mixed in 200 mL of N,N-dimethylformamide, 6 mol of thionyl chloride and 0.015 g of tert-butylcatechol were added, refluxed for 2 h, and distilled under reduced pressure and recrystallized to obtain a maleimide derivative; Step A2, after mixing 5.7 g of borax and 100 mL of deionized water, nitrogen was introduced, and then 2.8 g of dopamine hydrochloride was added and stirred for 20 min, and then 1.65 g of sodium carbonate was added, and then 3.54 g of maleimide derivative was slowly added in an ice water bath, and the reaction was stirred for 6.5 h. The pH of the system was adjusted to 1.5, and the dopamine-maleic anhydride derivative was obtained by extraction, drying, and recrystallization; Step A3: Mix 3 g of dopamine-maleic anhydride derivative and 1.13 g of dopamine hydrochloride in 100 mL of 0.01 mol / L Tris buffer (pH 8.5), add 4.5 g of spandex staple fiber, maintain the temperature at 30°C, stir and react for 12 h, filter, wash and dry to obtain modified spandex staple fiber.

[0015] The modified antioxidant is prepared by the following steps: Step B1, 0.02 mol of diethyl hydroxymethyl phosphate, 0.02 mol of triethylamine and 100 mL of dichloromethane were mixed and stirred in an ice-water bath for 30 min, and then 10 mL of 4-aminobenzoyl chloride dichloromethane solution was added and stirred for 50 min, and then the temperature was raised to 35° C. for 11 h, washed with water, rotary evaporated, purified, and rotary evaporated again to obtain a phosphate derivative. The 4-aminobenzoyl chloride dichloromethane solution was prepared by mixing and stirring 2.8 g of 4-aminobenzoyl chloride dichloromethane and 10 mL of dichloromethane; Step B2: Mix 5.8 g of a phosphate derivative, 0.06 g of dibutyltin dilaurate and 100 mL of ethanol, add 2 g of allyl isothiocyanate under stirring, heat to 50° C., react for 4 h, filter, wash and dry to obtain a modified antioxidant.

[0016] Example 3: Modified spandex staple fibers are prepared by the following steps: Step A1, 0.3 mol of 4-maleimidobenzoic acid was mixed in 200 mL of N,N-dimethylformamide, 8 mol of thionyl chloride and 0.02 g of tert-butylcatechol were added, refluxed for 2 h, and distilled under reduced pressure and recrystallized to obtain a maleimide derivative; Step A2, after mixing 7.2 g of borax and 100 mL of deionized water, nitrogen was introduced, and then 3.8 g of dopamine hydrochloride was added and stirred for 20 min, and then 2.2 g of sodium carbonate was added, and then 4.72 g of maleimide derivative was slowly added in an ice water bath, and the reaction was stirred for 8 h. The pH of the system was adjusted to 2, and the dopamine-maleic anhydride derivative was obtained by extraction, drying, and recrystallization; Step A3: Mix 4 g of dopamine-maleic anhydride derivative and 1.5 g of dopamine hydrochloride in 100 mL of 0.01 mol / L Tris buffer (pH 8.5), add 6 g of spandex staple fiber, maintain the temperature at 35°C, stir and react for 12 h, filter, wash and dry to obtain modified spandex staple fiber.

[0017] The modified antioxidant is prepared by the following steps: Step B1, 0.03 mol of diethyl hydroxymethyl phosphate, 0.03 mol of triethylamine and 100 mL of dichloromethane are mixed and stirred in an ice-water bath for 30 min, and then 10 mL of 4-aminobenzoyl chloride dichloromethane solution is added and stirred for 60 min, and then the temperature is raised to 35° C. and reacted for 12 h, washed with water, rotary evaporated, purified, and rotary evaporated again to obtain a phosphate derivative. The 4-aminobenzoyl chloride dichloromethane solution is prepared by mixing and stirring 4.2 g of 4-aminobenzoyl chloride dichloromethane and 10 mL of dichloromethane; Step B2: Mix 8.7 g of a phosphate derivative, 0.09 g of dibutyltin dilaurate and 100 mL of ethanol, add 3 g of allyl isothiocyanate under stirring, and heat to 55° C., react for 4.5 h, filter, wash and dry to obtain a modified antioxidant.

[0018] Embodiment 4: A method for preparing an anti-fatigue rubber material comprises the following steps: 60 parts of EPDM rubber, 15 parts of carbon black, 5 parts of modified spandex staple fiber prepared in Example 1, 1 part of modified antioxidant prepared in Example 1, 2.5 parts of dipentadienyl vulcanizing agent, 0.1 parts of vulcanization accelerator TMPTMA, and 0.5 parts of antioxidant 1010; Step S1, weighing raw materials by weight, mixing EPDM rubber, the modified antioxidant prepared in Example 1, antioxidant 1010, dipentadienyl vulcanizer and vulcanization accelerator TMPTMA in an internal mixer for 3 minutes to obtain a premixed rubber; Step S2, mixing carbon black, modified spandex staple fiber prepared in Example 1 and premixed rubber for 5 minutes, pressurizing and mixing to a temperature of 130°C, draining the rubber, cooling, and standing for 24 hours, then putting them into an internal mixer, pressurizing and mixing to 110°C, draining the rubber, cooling, and standing for 24 hours to obtain an anti-fatigue rubber material.

[0019] Embodiment 5: A method for preparing an anti-fatigue rubber material comprises the following steps: 70 parts of EPDM rubber, 20 parts of carbon black, 13 parts of modified spandex staple fibers prepared in Example 2, 2 parts of modified antioxidant prepared in Example 2, 3.5 parts of dipentadienyl vulcanizing agent, 0.3 parts of vulcanization accelerator TMPTMA, and 0.7 parts of antioxidant 1010; Step S1, weighing raw materials by weight, mixing EPDM rubber, the modified antioxidant prepared in Example 2, antioxidant 1010, dipentadienyl vulcanizer and vulcanization accelerator TMPTMA in an internal mixer for 4 minutes to obtain a premixed rubber; Step S2, mixing carbon black, modified spandex staple fiber prepared in Example 2 and premixed rubber for 7 minutes, pressurizing and mixing to a temperature of 140°C, draining the rubber, cooling, and standing for 24 hours, then putting them into an internal mixer, pressurizing and mixing to 115°C, draining the rubber, cooling, and standing for 24 hours to obtain an anti-fatigue rubber material.

[0020] Embodiment 6: A method for preparing an anti-fatigue rubber material comprises the following steps: 80 parts of EPDM rubber, 25 parts of carbon black, 10 parts of modified spandex staple fibers prepared in Example 3, 3 parts of modified antioxidant prepared in Example 3, 4.5 parts of dipentadienyl vulcanizing agent, 0.5 parts of vulcanization accelerator TMPTMA, and 1 part of antioxidant 1010; Step S1, weighing raw materials by weight, mixing EPDM rubber, the modified antioxidant prepared in Example 3, antioxidant 1010, dipentadienyl vulcanizing agent and vulcanization accelerator TMPTMA in an internal mixer for 5 minutes to obtain a premixed rubber; Step S2, mixing carbon black, modified spandex staple fiber prepared in Example 3 and premixed rubber for 10 minutes, pressurizing and mixing to a temperature of 150°C, draining the rubber, cooling, and standing for 24 hours, then putting them into an internal mixer, pressurizing and mixing to 120°C, draining the rubber, cooling, and standing for 24 hours to obtain an anti-fatigue rubber material.

[0021] Comparative Example 1: This comparative example is a rubber material, which differs from Example 6 in that spandex staple fibers are used instead of the modified spandex staple fibers prepared in Example 3, and the rest are the same.

[0022] Comparative Example 2: This comparative example is a rubber material. The difference from Example 6 is that the modified antioxidant prepared in Example 3 is replaced by a commercially available antioxidant RD, and the rest is the same.

[0023] Comparative Example 3: This comparative example is a rubber material, which includes the following raw materials in parts by weight: 80 parts of EPDM rubber, 25 parts of carbon black, 10 parts of spandex staple fibers, 3 parts of commercially available antioxidant RD, 4.5 parts of dipentadienyl vulcanizing agent, 0.5 parts of vulcanization accelerator TMPTMA, and 1 part of antioxidant 1010; the preparation method of the rubber material is the same as that of Example 6.

[0024] The rubber materials prepared in Examples 4-6 and Comparative Examples 1-2 were subjected to performance tests: Fatigue resistance test: Tested in accordance with GB / T 1687.1-2016 standard, with a preload of 4900N, an amplitude of ±3mm, and a frequency of 3Hz; Anti-aging performance test: The sample was vertically hung in a 150°C oven for thermal oxidation aging for 160 hours, and the change rate of tensile strength and elongation at break of the sample was tested using a universal material testing machine; The test results are shown in Table 1: Table 1: Performance test results

[0025] After the fatigue resistance test and the aging resistance test, the rubber material prepared by the present invention can be seen from Table 1 that the rubber material has excellent fatigue resistance and aging resistance, and has broad application prospects.

[0026] The above contents are merely examples and explanations of the concept of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the scope defined by the concept of the invention, they should all fall within the protection scope of the present invention.

Claims

1. An anti-fatigue rubber material, characterized in that: The invention comprises the following raw materials in parts by weight: 60-80 parts of EPDM rubber, 15-25 parts of carbon black, 5-10 parts of modified spandex staple fibers, 1-3 parts of modified antioxidants, 2.5-4.5 parts of vulcanizing agents, 0.1-0.5 parts of vulcanization accelerators, and 0.5-1 parts of antioxidants; The modified spandex staple fiber is prepared by oxidative polymerization of a dopamine-maleic anhydride derivative and dopamine hydrochloride on spandex staple fiber, the dopamine-maleic anhydride derivative is prepared by nucleophilic addition reaction of dopamine hydrochloride and a maleimide derivative, and the maleimide derivative is prepared by mixing 4-maleimidobenzoic acid and thionyl chloride and subjecting the mixture to reflux reaction; The modified antioxidant is prepared by an addition reaction between a phosphate derivative and allyl isothiocyanate; and the phosphate derivative is prepared by a nucleophilic substitution reaction between diethyl hydroxymethyl phosphate and 4-aminobenzoyl chloride.

2. The anti-fatigue rubber material according to claim 1, characterized in that: The modified spandex staple fiber is prepared by the following steps: Step A1, 4-maleimidobenzoic acid is mixed with N,N-dimethylformamide, thionyl chloride and tert-butylcatechol are added, refluxed for 2 hours, and distilled under reduced pressure and recrystallized to obtain a maleimide derivative; Step A2, after mixing borax and deionized water, nitrogen is introduced, dopamine hydrochloride is added and stirred for 20 minutes, sodium carbonate is added, and then the maleimide derivative is slowly added in an ice water bath, stirred for 5-8 hours, the pH of the system is adjusted to 1-2, extraction, drying and recrystallization are performed to obtain a dopamine-maleic anhydride derivative; Step A3, dopamine-maleic anhydride derivative and dopamine hydrochloride are mixed evenly in 0.01 mol / L Tris buffer, spandex staple fibers are added, and the temperature is maintained at 25-35° C., and the reaction is stirred for 12 h, filtered, washed, and dried to obtain modified spandex staple fibers.

3. The anti-fatigue rubber material according to claim 2, characterized in that: In step A1, the usage ratio of 4-maleimidobenzoic acid, N,N-dimethylformamide, thionyl chloride and tert-butylcatechol is 0.15-0.3 mol: 200 mL: 4-8 mol: 0.01-0.02 g.

4. The anti-fatigue rubber material according to claim 2, characterized in that: In step A2, the usage ratio of borax, deionized water, dopamine hydrochloride, sodium carbonate and maleimide derivative is 3.8-7.2 g:100 mL:1.9-3.8 g:1.1-2.2 g:2.36-4.72 g.

5. The anti-fatigue rubber material according to claim 2, characterized in that: In step A3, the dosage ratio of dopamine-maleic anhydride derivative, dopamine hydrochloride, Tris buffer and spandex staple fiber is 2-4 g: 0.75-1.5g:100mL:3-6g.

6. The anti-fatigue rubber material according to claim 1, characterized in that: The modified antioxidant is prepared by the following steps: Step B1, diethyl hydroxymethyl phosphate, triethylamine and dichloromethane are mixed, and stirred in an ice-water bath for 30 minutes, and then a dichloromethane solution of 4-aminobenzoyl chloride is added, stirred and reacted for 40-60 minutes, and then the temperature is raised to 35° C. to react for 10-12 hours, washed with water, rotary evaporated, purified, and rotary evaporated again to obtain a phosphate derivative; Step B2: Mix the phosphate derivative, dibutyltin dilaurate and ethanol, add allyl isothiocyanate under stirring, raise the temperature to 45-55° C., react for 3.5-4.5 hours, filter, wash and dry to obtain the modified antioxidant.

7. The anti-fatigue rubber material according to claim 6, characterized in that: In step B1, the usage ratio of diethyl hydroxymethyl phosphate, triethylamine, dichloromethane and 4-aminobenzoyl chloride dichloromethane solution is 0.01-0.03 mol: 0.01-0.03 mol: 100 mL: 10 mL, and the 4-aminobenzoyl chloride dichloromethane solution is prepared by mixing and stirring 1.4-4.2 g of 4-aminobenzoyl chloride dichloromethane and 10 mL of dichloromethane.

8. The anti-fatigue rubber material according to claim 6, characterized in that: In step B2, the usage ratio of the phosphate derivative, dibutyltin dilaurate, ethanol and allyl isothiocyanate is 2.9-8.7 g: 0.03-0.09 g: 100 mL: 1-3 g.

9. The anti-fatigue rubber material according to claim 1, characterized in that: The vulcanizing agent is dipentadienyl vulcanizing agent, the vulcanization accelerator is vulcanization accelerator TMPTMA, and the antioxidant is antioxidant 1010.

10. A method for preparing the anti-fatigue rubber material according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step S1, weighing raw materials by weight, mixing EPDM rubber, modified antioxidant, antioxidant, vulcanizing agent and vulcanization accelerator in an internal mixer for 3-5 minutes to obtain a premixed rubber; Step S2, mixing carbon black, modified spandex staple fiber and premixed rubber for 5-10 minutes, pressurizing and mixing to a temperature of 130-150°C, draining the rubber, cooling, and standing for 24 hours, then putting them into an internal mixer, pressurizing and mixing to 110-120°C, draining the rubber, cooling, and standing for 24 hours to obtain an anti-fatigue rubber material.

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