High-durability self-repairing tire composite material and preparation method thereof

Abstract

The invention relates to the field of rubber materials, in particular to a high-durability self-repairing type tire composite material and a preparation method thereof. The high-durability self-repairing type tire composite material is prepared from the following raw materials in parts by mass: 90 to 120 parts of rubber matrix, 8 to 15 parts of functional combination agent, 30 to 50 parts of reinforcing filler, 4 to 8 parts of reinforcing agent, 7 to 12 parts of activating agent, 2 to 4 parts of silane coupling agent, 1 to 1.5 parts of anti-aging agent, 0.5 to 2 parts of accelerant and 1.5 to 3 parts of sulfur. The invention provides the novel composite material for the tire, which has excellent mechanical properties, peel strength and durability and can keep a good self-repairing effect, so that the mechanical integrity, fatigue resistance and harsh environment tolerance of the material are greatly enhanced, and the service life of the tire is prolonged. The stability and the reliability of the performance of the tire in the whole life cycle are ensured, the contradictory problem of the strength, the elasticity and the repair efficiency is effectively balanced, and a new solution thought is provided for the tire composite material.

Description

Technical Field

[0001] This invention relates to the field of rubber materials, and in particular to a highly durable self-healing tire composite material and its preparation method. Background Technology

[0002] As the only part of a vehicle in contact with the ground, tires' performance directly affects driving safety, energy efficiency, and lifespan. For a long time, the tire industry has been committed to improving the overall performance of tires, especially durability and damage resistance, through advancements in materials science. Traditional tire composite materials mainly rely on natural or synthetic rubber as the matrix, with the addition of reinforcing fillers such as carbon black and silica to improve mechanical properties and wear resistance. While these materials exhibit a certain degree of reliability in daily use, they are essentially a passively damaged material system. Once punctured by a sharp object or develop internal cracks, tire pressure can be rapidly lost, leading to safety hazards. Furthermore, the damage is usually irreversible, requiring subsequent repairs or replacement. This not only inconveniences users but also increases resource consumption and environmental burden.

[0003] With the development of materials science, the concept of smart materials with self-healing capabilities has been introduced into the tire field, aiming to endow tires with the ability to actively cope with damage. In existing technologies, some commercialized or research-stage methods have emerged to achieve puncture resistance or self-healing in tires. Among these, the more mature and practically applied methods are based on physical sealing principles, such as pre-installing a high-viscosity sealant layer on the inner wall of the tire. When a foreign object punctures the tread, the sealant layer flows under the pressure of the air inside the tire and encapsulates the foreign object, blocking the leakage channel and achieving an immediate seal. This type of technology improves the tire's tolerance to minor punctures to some extent, but its repair mechanism relies on the added sealing material layer rather than the inherent properties of the tire's main material. Therefore, it suffers from limited repair range, potential impact on dynamic balance, and the possibility of sealant layer failure under repeated punctures or high temperatures. At a more cutting-edge research level, intrinsic self-healing technologies based on materials have become the focus, such as methods that disperse microcapsules in a rubber matrix. These microcapsules encapsulate liquid repair monomers or catalysts; when the material cracks, the capsules rupture, releasing their contents, which repair the damage through a polymerization reaction.

[0004] While existing technologies offer various approaches to tire self-healing, they still face significant technical bottlenecks when combined with the comprehensive performance requirements of tires in specific environments, such as mechanical properties and durability. This is because physical sealant technology is essentially an additional structural solution that does not improve the durability and repair capabilities of the base material itself, and its long-term reliability remains questionable. Furthermore, research on intrinsic self-healing materials often prioritizes repair efficiency while failing to simultaneously address the crucial performance indicators that tire composite materials must possess, such as high strength, high elasticity, fatigue resistance, and low rolling resistance.

[0005] Therefore, developing a composite material that can maintain the high durability and mechanical properties of tire composite materials while achieving efficient and reliable self-healing under actual use conditions has become a key issue that urgently needs to be addressed in the field of tire technology. Summary of the Invention

[0006] The purpose of this invention application is to provide a novel composite material for tires that combines excellent mechanical properties, peel strength, and durability with good self-healing properties.

[0007] To achieve the above objectives, the present invention provides the following technical solution: The first aspect of this invention provides a highly durable self-healing tire composite material, comprising, by weight, 90-120 parts of rubber matrix, 8-15 parts of functional compound agent, 30-50 parts of reinforcing filler, 4-8 parts of reinforcing agent, 7-12 parts of activator, 2-4 parts of silane coupling agent, 1-1.5 parts of antioxidant, 0.5-2 parts of accelerator, and 1.5-3 parts of sulfur.

[0008] In a preferred embodiment, the rubber matrix is ​​a combination of solution-polymerized styrene-butadiene rubber and cis-butadiene rubber.

[0009] In a preferred embodiment, the mass ratio of solution-polymerized styrene-butadiene rubber to cis-butadiene rubber is (7~9):(2~3).

[0010] In a preferred embodiment, the mass ratio of solution-polymerized styrene-butadiene rubber to cis-butadiene rubber is (7~8):(2.5~3).

[0011] In a preferred embodiment, the solution-polymerized styrene-butadiene rubber is specifically SSBR-2557S, manufactured by Dushanzi Petrochemical.

[0012] In a preferred embodiment, the butadiene rubber is specifically BR9000, manufactured by Yanshan Petrochemical.

[0013] In a preferred embodiment, the mass ratio of the rubber matrix, functional compound, and reinforcing agent is (10~11.5):(0.9~1.3):(0.5~0.7).

[0014] In a preferred embodiment, the mass ratio of the rubber matrix, functional compound, and reinforcing agent is (10~11):(1~1.2):(0.6~0.7).

[0015] In a preferred embodiment, the functional combination agent is a combination of furfuryl alcohol and bismaleimide.

[0016] In a preferred embodiment, the mass ratio of furfuryl alcohol to bismaleimide is (6~8):(3~5).

[0017] In a preferred embodiment, the mass ratio of furfuryl alcohol to bismaleimide is (6~7):(3~4).

[0018] In this application, furfuryl alcohol and bismaleimide are used as the core of the self-healing system to construct a reversible covalent bond network. When the rubber is damaged, the covalent bonds present can undergo reversible breakage and recombination under heating conditions, thereby achieving autonomous healing of the crack interface. At the same time, the internal network system and non-covalent interactions such as ionic bonds present in the material work together to not only ensure efficient self-healing ability, but also endow the composite material with excellent durability, high mechanical strength and fatigue resistance, significantly extending the service life and safety period of the tire under complex working conditions.

[0019] In a preferred embodiment, the reinforcing filler is at least one selected from silica, carbon black, talc, barium sulfate, calcium carbonate, and mica powder.

[0020] In a preferred embodiment, the reinforcing filler is silica or carbon black.

[0021] In a preferred embodiment, the reinforcing filler is carbon black.

[0022] In a preferred embodiment, the average particle size of the reinforcing filler is 10~50nm.

[0023] In a preferred embodiment, the average particle size of the reinforcing filler is 10~25 nm.

[0024] In a preferred embodiment, the reinforcing agent is a combination of epoxy-terminated polydimethylsiloxane and carboxyl-terminated fluororubber.

[0025] In a preferred embodiment, the mass ratio of the epoxy-terminated polydimethylsiloxane to the carboxyl-terminated fluororubber is (2~3):(5~7).

[0026] In a preferred embodiment, the mass ratio of the epoxy-terminated polydimethylsiloxane to the carboxyl-terminated fluororubber is (2.3~2.6):(6~6.8).

[0027] In a preferred embodiment, the carboxyl-terminated fluororubber is specifically a carboxyl-terminated liquid perfluoroether rubber (CFOR), manufactured by Hubei Xinyuhong Biotechnology Co., Ltd.

[0028] Furthermore, by using carboxyl-terminated liquid perfluoroether rubber and epoxy-terminated polydimethylsiloxane as reinforcing agents, which are strongly anchored at the interface between the rubber matrix and the reinforcing filler, the mechanical strength, tear resistance and durability of the composite material are greatly improved, and crack propagation is effectively inhibited. The introduced flexible segments also help to disperse stress and have a stronger synergistic effect with the self-healing dynamic network, thereby significantly enhancing the overall performance of the tire under extreme conditions without compromising the elasticity and repair efficiency of the material.

[0029] In a preferred embodiment, the activator is at least one selected from zinc oxide, stearic acid, zinc stearate, and organozinc complexes.

[0030] In a preferred embodiment, the activator is a combination of zinc oxide and stearic acid.

[0031] In a preferred embodiment, the mass ratio of zinc oxide to stearic acid is (4~5):(1~2).

[0032] In a preferred embodiment, the mass ratio of zinc oxide to stearic acid is (4.5~5):(1.2~1.5).

[0033] In a preferred embodiment, the average particle size of the zinc oxide is 25~100nm.

[0034] In a preferred embodiment, the average particle size of the zinc oxide is 25~50 nm.

[0035] In a preferred embodiment, the silane coupling agent is at least one of Si-69, Si-75, KH-590, A-151, and KH-550.

[0036] In a preferred embodiment, the silane coupling agent is Si-69 or Si-75.

[0037] In a preferred embodiment, the silane coupling agent is Si-69.

[0038] In a preferred embodiment, the antioxidant is at least one of antioxidant 4020, antioxidant 6PPD, and antioxidant TMQ.

[0039] In a preferred embodiment, the antioxidant is antioxidant 4020 or antioxidant 6PPD.

[0040] In a preferred embodiment, the accelerator is at least one selected from accelerator CBS, accelerator TBBS, accelerator MBT, and accelerator DPG.

[0041] In a preferred embodiment, the accelerator is accelerator CBS or accelerator TBBS.

[0042] The second aspect of this invention provides a method for preparing the above-mentioned high-durability self-healing tire composite material, specifically including the following steps: S1: Adding the reinforcing agent raw material to a container and continuously stirring and mixing at 85~90℃ for 40~min to obtain the reinforcing agent; S2: Adding the rubber matrix to a mixer and refining at 70~75℃ for 2~3min, then adding the functional compounding agent, heating to 80~85℃ and mixing for 3~5min, then adding reinforcing filler, reinforcing agent, activator, silane coupling agent and antioxidant, and heating to 140~145℃. Mix for 4-5 minutes, then discharge the rubber and let it stand at room temperature for 12-14 hours to obtain the masterbatch; S3: Pass the masterbatch through a thin roller at a roller temperature of 50-55℃ for 5-6 minutes, then add the accelerator and sulfur, cut with left and right cutters and make triangular wrapping for a total of 5-6 times to obtain the sheet, and let it stand for 4-5 hours to obtain the final compound; S4: Place the final compound in a mold and vulcanize at 145-150℃ and 12-15MPa for T90+3 minutes, then place the rubber in an oven at 80-85℃ for 24-26 hours for heat treatment, and then cool naturally to obtain the final compound.

[0043] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows: 1. The tire composite material provided in this invention application significantly improves the overall performance of the product. It not only possesses highly efficient self-healing capabilities, enabling performance recovery through gentle thermal stimulation after damage, but also greatly enhances the material's mechanical integrity, fatigue resistance, and tolerance to harsh environments. This ensures the stability and reliability of the tire's performance throughout its entire lifespan, effectively balancing the conflicting issues of strength, elasticity, and repair efficiency, and providing a new solution for tire composite materials.

[0044] 2. This invention uses furfuryl alcohol and bismaleimide as the core of the self-healing system to construct a reversible covalent bond network. When the rubber is damaged, the covalent bonds present can undergo reversible breakage and recombination under heating conditions, thereby achieving autonomous healing of the crack interface. At the same time, the internal network system and non-covalent interactions such as ionic bonds present in the material work together to not only ensure efficient self-healing ability, but also endow the composite material with excellent durability, high mechanical strength and fatigue resistance.

[0045] 3. This invention uses carboxyl-terminated liquid perfluoroether rubber and epoxy-terminated polydimethylsiloxane as reinforcing agents, which are strongly anchored at the interface between the rubber matrix and the reinforcing filler. This not only greatly improves the mechanical strength, tear resistance and durability of the composite material, but also effectively inhibits crack propagation. Detailed Implementation

[0046] The technical solutions in the embodiments of this invention will be clearly and completely described below. The described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0047] In the following specific embodiments, unless otherwise specified, the sources / preparation methods of some raw materials are as follows: Solution-polymerized styrene-butadiene rubber SSBR-2557S, Dushanzi Petrochemical.

[0048] Butadiene rubber BR9000, Yanshan Petrochemical.

[0049] Furfuryl alcohol, industrial premium grade, Shandong Chuangying Chemical.

[0050] Bismaleimide, industrial grade, Hubei Xinghengye.

[0051] The epoxy-terminated polydimethylsiloxane is a polydimethylsiloxane with epoxypropoxypropyl-terminated structure, manufactured by Hubei Xinyuhong Biotechnology Co., Ltd.

[0052] Carboxyl-terminated liquid perfluoroether rubber (CFOR), Hubei Xinyuhong Biotechnology.

[0053] Example 1 A highly durable self-healing tire composite material, by weight, comprises the following raw materials: 100 parts rubber matrix, 11.4 parts functional compound, 47.5 parts reinforcing filler, 6.6 parts reinforcing agent, 8.5 parts activator, 2.8 parts silane coupling agent, 1.2 parts antioxidant, 1.5 parts accelerator, and 1.9 parts sulfur.

[0054] The rubber matrix is ​​a combination of solution-polymerized styrene-butadiene rubber SSBR-2557S and cis-butadiene rubber BR9000, with a mass ratio of 7:3.

[0055] The functional compound is a combination of furfuryl alcohol and bismaleimide in a mass ratio of 6.5:3.5.

[0056] The reinforcing filler is carbon black with an average particle size of 22 nm.

[0057] The reinforcing agent is a combination of epoxy-terminated polydimethylsiloxane and carboxyl-terminated liquid perfluoroether rubber CFOR, with a mass ratio of 2.4:6.6.

[0058] The activator is a combination of zinc oxide and stearic acid in a mass ratio of 4.6:1.4.

[0059] The average particle size of zinc oxide is 40 nm.

[0060] The silane coupling agent is Si-69; the antioxidant is antioxidant 4020; and the accelerator is accelerator CBS.

[0061] A method for preparing the above-mentioned high-durability self-healing tire composite material specifically includes the following steps: S1: Add the reinforcing agent raw material to a container and continuously stir and mix at 90°C for 40 min to obtain the reinforcing agent; S2: Add the rubber matrix to a mixer, refine at 75°C for 3 min, add the functional compounding agent, heat to 85°C and mix for 4 min, then add the reinforcing filler, reinforcing agent, activator, silane coupling agent and antioxidant, heat to 140°C and mix for 5 min, after completion, discharge the rubber and let it stand at room temperature for 13 h to obtain the masterbatch; S3: Thinly pass the masterbatch through a roller at a roller temperature of 55°C for 5 min, then add the accelerator and sulfur, cut with left and right cutters and make triangular wraps a total of 6 times to obtain the sheet, and let it stand for 4 h to obtain the final compound; S4: Place the final compound in a mold and vulcanize at 150°C and 13MPa for T90+3 min, then place the rubber in an 85°C oven for 24 h for heat treatment, and then cool naturally to obtain the final compound.

[0062] Example 2 A highly durable self-healing tire composite material, by weight, comprises the following raw materials: 105 parts rubber matrix, 10.5 parts functional compound, 47.5 parts reinforcing filler, 5.8 parts reinforcing agent, 8.5 parts activator, 2.8 parts silane coupling agent, 1.2 parts antioxidant, 1.5 parts accelerator, and 1.9 parts sulfur.

[0063] The functional compound is a combination of furfuryl alcohol and bismaleimide in a mass ratio of 6.5:4.5.

[0064] Example 3 A highly durable self-healing tire composite material, by weight, comprises the following raw materials: 110 parts rubber matrix, 12 parts functional compound, 47.5 parts reinforcing filler, 7 parts reinforcing agent, 8.9 parts activator, 2.9 parts silane coupling agent, 1.2 parts antioxidant, 1.6 parts accelerator, and 2 parts sulfur.

[0065] The reinforcing agent is a combination of epoxy-terminated polydimethylsiloxane and carboxyl-terminated liquid perfluoroether rubber CFOR, with a mass ratio of 3:6.

[0066] Comparative Example 1 A highly durable self-healing tire composite material, by weight, comprises the following raw materials: 110 parts rubber matrix, 4.5 parts functional compound, 47.5 parts reinforcing filler, 9.5 parts reinforcing agent, 8.5 parts activator, 2.8 parts silane coupling agent, 1.2 parts antioxidant, 1.5 parts accelerator, and 1.9 parts sulfur.

[0067] The remaining implementation methods are the same as in Example 1.

[0068] Comparative Example 2 A highly durable self-healing tire composite material, by weight, comprises the following raw materials: 105 parts rubber matrix, 14.5 parts functional compound, 47.5 parts reinforcing filler, 2.1 parts reinforcing agent, 8.5 parts activator, 2.8 parts silane coupling agent, 1.2 parts antioxidant, 1.5 parts accelerator, and 1.9 parts sulfur.

[0069] The remaining implementation methods are the same as in Example 1.

[0070] Comparative Example 3 A highly durable self-healing tire composite material, by weight, comprises the following raw materials: 100 parts rubber matrix, 11.4 parts functional compound, 47.5 parts reinforcing filler, 6.6 parts reinforcing agent, 8.5 parts activator, 2.8 parts silane coupling agent, 1.2 parts antioxidant, 1.5 parts accelerator, and 1.9 parts sulfur.

[0071] The reinforcing agent is a combination of epoxy-terminated polydimethylsiloxane and carboxyl-terminated liquid perfluoroether rubber (CFOR) in a mass ratio of 1:8.

[0072] The remaining implementation methods are the same as in Example 1.

[0073] Comparative Example 4 A highly durable self-healing tire composite material, by weight, comprises the following raw materials: 100 parts rubber matrix, 11.4 parts functional compound, 47.5 parts reinforcing filler, 6.6 parts reinforcing agent, 8.5 parts activator, 2.8 parts silane coupling agent, 1.2 parts antioxidant, 1.5 parts accelerator, and 1.9 parts sulfur.

[0074] The reinforcing agent is a combination of epoxy-terminated polydimethylsiloxane and carboxyl-terminated liquid perfluoroether rubber (CFOR) in a mass ratio of 5:4.

[0075] The remaining implementation methods are the same as in Example 1.

[0076] Comparative Example 5 A highly durable self-healing tire composite material, by weight, comprises the following raw materials: 100 parts rubber matrix, 11.4 parts functional compound, 47.5 parts reinforcing filler, 6.6 parts reinforcing agent, 8.5 parts activator, 2.8 parts silane coupling agent, 1.2 parts antioxidant, 1.5 parts accelerator, and 1.9 parts sulfur.

[0077] The functional compound is a combination of furfuryl alcohol and bismaleimide in a mass ratio of 8.5:1.5.

[0078] The remaining implementation methods are the same as in Example 1.

[0079] Comparative Example 6 A highly durable self-healing tire composite material, by weight, comprises the following raw materials: 100 parts rubber matrix, 11.4 parts functional compound, 47.5 parts reinforcing filler, 6.6 parts reinforcing agent, 8.5 parts activator, 2.8 parts silane coupling agent, 1.2 parts antioxidant, 1.5 parts accelerator, and 1.9 parts sulfur.

[0080] The functional compound is a combination of furfuryl alcohol and bismaleimide in a mass ratio of 3.5:6.5.

[0081] The remaining implementation methods are the same as in Example 1.

[0082] Performance testing 1. Mechanical properties: The test was conducted in accordance with GB / T 528-2009, using dumbbell type I specimens, at room temperature of 25℃ and 50%RH, with a tensile speed of 500 mm / min. The results of tensile strength and elongation at break are recorded in Table 1.

[0083] 2. Peel strength: The composite material and polyester cord (1400D / 2, pattern model DY-157) were coated with adhesive and co-vulcanized in a mold to form H-type samples. The vulcanization conditions were 150℃, pressure 13MPa, time T90+3 min. After that, the samples were left to stand in a standard laboratory environment (temperature 23℃±2℃, relative humidity 50%±5%) for 24h. Under the same conditions, the samples were peeled at a rate of 100mm / min. The peel strength was recorded in Table 1.

[0084] 3. Durability: The composite material was tested using dumbbell-shaped specimens at 25℃ and 50%RH at a frequency of 300 cycles / minute. The flexural time that produced a 5mm crack was recorded. The results were recorded as the average of 10 tests in Table 1.

[0085] 4. Self-healing: Five standard dumbbell-shaped specimens of the composite material were prepared. The average tensile strength was tested according to the performance test 1 scheme. Then, a through cut of uniform length was made in the middle of each specimen with a sharp blade. The cut length was 1±0.1cm and the depth was 0.5±0.03mm. The damaged specimens were treated in an 80℃ oven for 4h, and then restored to room temperature and equilibrated for 24h in a standard laboratory environment. The average tensile strength of the same batch of repaired specimens was tested again, and the self-healing rate was calculated. Self-healing rate (%) = (average tensile strength after test / average tensile strength before test) × 100%. The results were recorded in Table 1.

[0086] Table 1 Performance Test Results 1

[0087] Analysis of test results: Examples 1-3, employing the technical solutions defined in this application, achieved superior test results compared to Comparative Examples 1-6 in terms of mechanical properties, peel strength, durability, and self-healing effect. This is attributed to the excellent construction of the self-healing system promoted by the technical solutions defined in this application in Examples 1-3. This not only ensures efficient self-healing capabilities but also endows the composite material with excellent durability, high mechanical strength, and fatigue resistance. Furthermore, the use of carboxyl-terminated liquid perfluoroether rubber and epoxy-terminated polydimethylsiloxane as reinforcing agents, combined with an appropriate formulation, strongly anchors the composite material at the interface between the rubber matrix and the reinforcing filler. This not only significantly improves the mechanical strength, tear resistance, and durability of the composite material but also effectively inhibits crack propagation. In contrast, Comparative Examples 1-6, employing other technical solutions different from those defined in this application, resulted in a significant decrease in the corresponding technical effects of their solutions within the composite material system, ultimately leading to a decline in overall performance.

[0088] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention.

Claims

1. A highly durable self-healing tire composite material, characterized in that: By weight, the raw materials include: 90-120 parts of rubber matrix, 8-15 parts of functional compound agent, 30-50 parts of reinforcing filler, 4-8 parts of reinforcing agent, 7-12 parts of activator, 2-4 parts of silane coupling agent, 1-1.5 parts of antioxidant, 0.5-2 parts of accelerator, and 1.5-3 parts of sulfur. The rubber matrix is ​​a combination of solution-polymerized styrene-butadiene rubber and cis-butadiene rubber, with a mass ratio of (7~9):(2~3). The functional combination agent is a combination of furfuryl alcohol and bismaleimide in a mass ratio of (6~8):(3~5). The reinforcing agent is a combination of epoxy-terminated polydimethylsiloxane and carboxyl-terminated fluororubber, with a mass ratio of (2~3):(5~7).

2. The high-durability self-healing tire composite material according to claim 1, characterized in that: The mass ratio of the functional compound and the reinforcing agent in the rubber matrix is ​​(10~11.5):(0.9~1.3):(0.5~0.7).

3. The high-durability self-healing tire composite material according to claim 2, characterized in that: The reinforcing filler is at least one of silica, carbon black, talc, barium sulfate, calcium carbonate, and mica powder.

4. The high-durability self-healing tire composite material according to claim 3, characterized in that: The average particle size of the reinforcing filler is 10~50nm.

5. The high-durability self-healing tire composite material according to claim 4, characterized in that: The activator is at least one of zinc oxide, stearic acid, zinc stearate, and organozinc complexes.

6. The high-durability self-healing tire composite material according to claim 5, characterized in that: The activator is a combination of zinc oxide and stearic acid in a mass ratio of (4~5):(1~2).

7. The high-durability self-healing tire composite material according to claim 6, characterized in that: The silane coupling agent is at least one of Si-69, Si-75, KH-590, A-151 and KH-550.

8. The high-durability self-healing tire composite material according to claim 7, characterized in that: The antioxidant is at least one of antioxidant 4020, antioxidant 6PPD, and antioxidant TMQ.

9. The high-durability self-healing tire composite material according to claim 8, characterized in that: The accelerator is at least one of the following: accelerator CBS, accelerator TBBS, accelerator MBT, and accelerator DPG.

10. A method for preparing a high-durability self-healing tire composite material according to any one of claims 1 to 9, characterized in that: Specifically, the following steps are included: S1: Add the reinforcing agent raw material to the container and stir continuously at 85~90℃ for 40~min to obtain the reinforcing agent; S2: Add the rubber matrix to a mixer and refining at 70-75℃ for 2-3 minutes. Then add the functional compound, heat to 80-85℃ and mix for 3-5 minutes. Next, add reinforcing fillers, reinforcing agents, activators, silane coupling agents and antioxidants, heat to 140-145℃ and mix for 4-5 minutes. After completion, discharge the rubber and let it stand at room temperature for 12-14 hours to obtain the masterbatch. S3: Pass the masterbatch through a thin roller at a roller temperature of 50-55℃ for 5-6 minutes. Then add the accelerator and sulfur, cut with left and right cutters and make triangular wraps a total of 5-6 times to obtain the sheet. Let it stand for 4-5 hours to obtain the final compound. S4: Place the final compound in a mold and vulcanize at 145-150℃ and 12-15MPa for T90+3 minutes. Then place the rubber in an oven at 80-85℃ for 24-26 hours for heat treatment, and then cool naturally to obtain the final compound.

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