Polymer memory rubber for puncture-resistant and leakage-proof tires

Abstract

The invention discloses macromolecular memory rubber for a puncture-resistant and leakage-proof tire, and relates to the technical field of macromolecular rubber materials. The material is composed of a basic rubber component, a reinforced filling component, a memory function component, a leak-proof function component and an auxiliary component, and synergistic reinforcement among the components is realized through a multi-stage internal mixing process. In the preparation process, a gradient heating mixing technology is adopted, and after plastication, dynamic vulcanization and compression molding, the composite rubber material with a three-dimensional network structure is formed. The finished rubber product has the characteristics of high strength, high toughness and self-repairing, the area of a punctured hole can be closed by more than or equal to 85% within 24 hours, the tire pressure drop amplitude is stably controlled within 5% after continuous puncturing for 10 times, and the shock resistance and the driving safety of a tire are remarkably improved.

Description

Technical Field

[0001] This invention belongs to the field of polymer rubber material technology, specifically relating to a puncture-resistant and leak-proof polymer memory rubber for tires. Background Technology

[0002] With the rapid development of the automotive industry, tires, as a key vehicle component, face higher demands for driving safety. Traditional tire rubber materials generally suffer from insufficient puncture resistance, making them particularly vulnerable to punctures by sharp objects in complex road conditions, leading to air leaks or even tire blowouts. Currently available tires mostly rely on physical reinforcement structures or simple additives to improve their protective capabilities, but limited by the inherent properties of the materials, their resistance to dynamic impacts and self-healing efficiency are insufficient to meet the demands. For example, after being punctured by a 1.5mm diameter steel needle, the shrinkage rate of the puncture hole in conventional rubber composite materials is typically less than 50%, and slow repair requires external pressure or heating devices, failing to meet the immediate sealing requirements of high-speed driving scenarios.

[0003] CN116023736A discloses a styrene-butadiene rubber / polypropylene thermoplastic elastomer composition, a vulcanized styrene-butadiene rubber / polypropylene thermoplastic elastomer, its preparation method, and its applications. This invention provides a vulcanized styrene-butadiene rubber / polypropylene thermoplastic elastomer with excellent mechanical properties, but it fails to effectively balance the contradiction between strength and toughness. While some technical solutions claim to possess self-healing capabilities, their repair mechanisms rely on chemical reactions or external energy input, resulting in slow response speeds and long repair cycles. For example, CN113502135B discloses a self-healing rubber composition for tires and its preparation method, using a combination of materials such as anti-vulcanized rubber prepolymer, liquid isoprene, triglycerides, silica-gel-catalyst repair polymer double-shell microspheres, modified silica, and tackifying resin. The resulting self-healing rubber material has a low repair rate.

[0004] To address the aforementioned technical bottlenecks, this invention proposes a puncture-resistant and leak-proof rubber material based on polymer memory effect and composite structure design. By constructing a styrene-butadiene rubber / cis-butadiene rubber biphase elastomer matrix and introducing a nano-silica-aramid short fiber synergistic reinforcement system, the basic mechanical properties of the material are significantly improved. Furthermore, a polylactic acid-grafted maleic anhydride modified thermoplastic elastomer is innovatively integrated as a shape memory functional component, combined with a dual leak-proof barrier of ultra-high molecular weight polyethylene fiber / butyl rubber microspheres, achieving self-sensing and adaptive closure of puncture holes. Under dynamic loads, this material can rapidly respond to external force deformation, utilizing the temporary deformation formed by the orientation of polymer chain segments to store energy. After the external force is removed, the relaxation of the molecular chains drives the edge of the hole to move towards the center, achieving efficient sealing in conjunction with the elastic deformation of the microspheres, providing a new technical path for tire puncture protection. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the embodiments of the present invention provide a polymer memory rubber for puncture-resistant and leak-proof tires, which solves the problems of insufficient puncture resistance, low self-healing efficiency, slow dynamic response and poor material synergy of tire rubber in the prior art.

[0006] To address the above problems, the present invention provides the following technical solution: A puncture-resistant and leak-proof tire made of high-molecular memory rubber, comprising the following components by weight: 60-80 parts of base rubber, 20-30 parts of reinforcing filler, 5-15 parts of memory function component, 3-10 parts of leak-proof function component, and 1-5 parts of additive component. Preferably, the base rubber component of the aforementioned polymer memory rubber is a mixture of styrene-butadiene rubber and butadiene rubber, wherein the Mooney viscosity of the styrene-butadiene rubber is 50-70, the cis-1,4-structure content of the butadiene rubber is ≥95%, and the mass ratio of styrene-butadiene rubber to butadiene rubber is 60-70:30-40. Preferably, in the aforementioned polymer memory rubber, the reinforcing filler component is a mixture of nano-silica and aramid short fibers, wherein the nano-silica has a particle size of 10-20 nm and a specific surface area of ​​150-200 m². 2 / g, the length of the aramid short fiber is 3-5mm and the diameter is 5-10μm, and the mass ratio of nano silica to aramid short fiber is 15-20:5-8; Preferably, the memory function component of the aforementioned polymer memory rubber is a polylactic acid-grafted maleic anhydride-modified thermoplastic elastomer, wherein the grafting rate of polylactic acid-grafted maleic anhydride is 5-8%, and the thermoplastic elastomer is a styrene-butadiene-styrene block copolymer. Preferably, the leak-proof functional component of the aforementioned high-molecular-weight memory rubber is a mixture of ultra-high molecular weight polyethylene fiber and butyl rubber microspheres. The ultra-high molecular weight polyethylene fiber has a molecular weight of 1-2 million and a fineness of 1-3 denier. The butyl rubber microspheres have a particle size of 5-10 μm and a Mooney viscosity of 30-50. The mass ratio of ultra-high molecular weight polyethylene fiber to butyl rubber microspheres is 2-3:1-2. Preferably, in the above-mentioned polymer memory rubber, the auxiliary components include vulcanizing agents, accelerators, and antioxidants.

[0007] Preferably, the styrene-butadiene rubber (SBR) of the aforementioned polymer memory rubber has a Mooney viscosity of 55-65; and the butadiene rubber has a cis-1,4-structure content ≥97%. This balances the processing fluidity and finished product strength of the rubber, avoiding excessively low viscosity which leads to easy deformation of the rubber compound or excessively high viscosity which makes it difficult to mix. The high cis-structure content of the butadiene rubber is because the more cis-structures there are, the better the elasticity and wear resistance of the rubber, thus improving the fatigue resistance of the tire.

[0008] Preferably, in the aforementioned polymeric memory rubber, the nano-silica has a particle size of 12-18 nm and a specific surface area of ​​160-190 m² / g; the aramid short fibers have a length of 3.5-4.5 mm and a diameter of 6-9 μm. The optimization of the nano-silica particle size and specific surface area is to increase its contact area with the rubber matrix, enhance interfacial bonding, and avoid agglomeration due to excessively small particle size or weakening of the reinforcing effect due to excessively large particle size. The size limitation of the aramid short fibers is to ensure that the fibers are uniformly dispersed in the rubber compound, forming effective support and improving the tear strength and impact resistance of the material.

[0009] Preferably, in the aforementioned polymeric memory rubber, the grafting rate of polylactic acid to maleic anhydride is 6-7%; the mass percentage of styrene units in the styrene-butadiene-styrene block copolymer is 25-30%. If the grafting rate is too low, the compatibility with the elastomer will be poor, and effective memory function cannot be achieved; if it is too high, the elasticity of the material will be reduced. The limited proportion of styrene units in the styrene-butadiene-styrene block copolymer is to balance the rigidity and elasticity of the material and ensure stable memory recovery performance.

[0010] Preferably, in the aforementioned high-molecular-weight memory rubber, the ultra-high molecular weight polyethylene fiber has a molecular weight of 1.2-1.8 million and a fineness of 1.5-2.5 denier; the butyl rubber microspheres have a particle size of 6-9 μm and a Mooney viscosity of 35-45. Excessively high molecular weight can lead to uneven fiber dispersion, while excessively low molecular weight results in insufficient strength. A suitable fineness allows the fibers to form an effective barrier during puncture. The limited particle size and Mooney viscosity of the butyl rubber microspheres are designed to allow the microspheres to quickly fill the puncture hole while tightly bonding with the rubber matrix, thus improving leak-proof efficiency.

[0011] In the aforementioned polymeric memory rubber, preferably, the vulcanizing agent in the auxiliary components is sulfur, with an amount of 22-28% of the auxiliary components; the accelerator is N-cyclohexyl-2-benzothiazole sulfenamide, with an amount of 32-38% of the auxiliary components; and the antioxidant is N-isopropyl-N'-phenyl-p-phenylenediamine, with an amount of 32-48% of the auxiliary components. Excessive vulcanizing agent will make the rubber too hard and brittle, while insufficient vulcanization will result in incomplete vulcanization. The amount of accelerator must be matched with the vulcanizing agent to ensure a moderate reaction rate. The amount of antioxidant must balance the antioxidant effect with cost, avoiding excessive amounts that could negatively impact the rubber compound's performance.

[0012] Preferably, the preparation method of the aforementioned polymeric memory rubber includes the following steps: S1. Mix styrene-butadiene rubber and butadiene rubber in a certain proportion and add them to an internal mixer. Plasticize at a temperature of 80-100℃ for 15-20 minutes. S2. Add a mixture of nano-silica and aramid short fibers to the base rubber component after plasticizing in step S1, and continue to mix in the internal mixer at 80-100℃ for 10-15 minutes. S3. Add the memory function component and the leak-proof function component to the mixed rubber compound obtained in step S2, and adjust the internal mixer temperature to 90-110℃ and continue mixing for 8-12 minutes. S4. Reduce the internal mixer temperature to 70-90℃, add the auxiliary components to the mixed rubber compound, and perform final mixing for 5-8 minutes to obtain a homogeneous compound. S5. Transfer the compound obtained in step S4 into the molding die, and pre-form it for 3-5 minutes under a pressure of 10-15MPa and a temperature of 80-95℃ to obtain a pre-formed rubber blank. S6. Transfer the preformed rubber blank from step S5 to a vulcanizing machine and vulcanize it at a temperature of 140-160℃ and a pressure of 10-18MPa for 15-25 minutes. S7. After vulcanization in step S6, allow the material to cool naturally to room temperature, trim the product, and obtain the polymer memory rubber for puncture-resistant and leak-proof tires. The initial low-temperature plasticizing process here allows the base rubber to soften uniformly. Maintaining the temperature after adding reinforcing components prevents fiber breakage. Increasing the temperature and adding functional components promotes compatibility. Final cooling and adding additives prevents premature reaction of the additives. Controlling the pressure, temperature, and time during pre-forming and vulcanization ensures the rubber compound flows fully during molding, while maintaining a suitable degree of cross-linking to form a stable structure.

[0013] Preferably, the polymer memory rubber has a tensile strength ≥19MPa, an elongation at break ≥420%, and a tear strength ≥52kN / m.

[0014] Preferably, the above-mentioned polymer memory rubber, after being punctured by a steel needle with a diameter of 1.5 mm, has a puncture hole shrinkage rate of ≥70% after being placed at 25°C for 12 hours and ≥85% after being placed for 24 hours.

[0015] Preferably, the aforementioned polymer memory rubber is punctured 10 times continuously with a steel needle of 1.5 mm in diameter at a speed of 50 mm / s. After the first puncture, the internal pressure of the tire decreases by ≤3%, and after the tenth puncture, the internal pressure of the tire decreases by ≤5%.

[0016] This invention relates to a polymer memory rubber. Through multi-component synergistic design and process optimization, a puncture-resistant and leak-proof rubber material is constructed. Styrene-butadiene rubber (SBR) and cis-butadiene rubber (BR) composites are selected as the base elastomer, utilizing the former's abrasion resistance and the latter's high elasticity to balance the material's overall performance. A gradient reinforcement system of nano-silica and aramid short fibers is introduced. Nanoparticle surface modification enhances interfacial bonding, while the directional arrangement of aramid fibers strengthens puncture resistance. A polylactic acid-grafted maleic anhydride-modified thermoplastic elastomer is innovatively integrated as a shape memory functional module, utilizing its thermally induced chain segment movement to achieve self-repair of puncture holes. A dual leak-proof barrier of ultra-high molecular weight polyethylene (UHMWPE) fiber and butyl rubber microspheres is designed; the former delays leakage through physical barrier, while the latter actively seals pores through elastic deformation. In terms of process, gradient temperature mixing technology optimizes component dispersion, and the vulcanization process precisely controls crosslinking density, ultimately forming a three-dimensional network structure material with dynamic response characteristics, achieving rapid self-sensing, self-repair, and long-term leak-proof functions for puncture damage.

[0017] Compared with the prior art, the advantages of the present invention are as follows: (1) The present invention combines styrene-butadiene rubber and cis-butadiene rubber to balance the wear resistance and resilience of the rubber. The nanoscale effect of nano-silica and the directional reinforcement of aramid short fibers form a micro-composite reinforcement system, which significantly improves the tear resistance and dynamic fatigue life of the material. (2) The polylactic acid grafted maleic anhydride modified thermoplastic elastomer of the present invention imparts the material with shape memory effect, and achieves autonomous closure of puncture holes through the orderly arrangement of polymer chain segments after the external force is removed, breaking through the limitation of traditional rubber relying on external intervention for repair. (3) The present invention uses ultra-high molecular weight polyethylene fiber to construct a physical barrier layer to delay air leakage, and butyl rubber microspheres form a dynamic sealing layer through elastic deformation, forming a "blocking-repair" linkage anti-leakage mechanism, which solves the defects of single anti-leakage layer response lag or incomplete sealing. (4) The present invention achieves uniform dispersion of fillers and interface strengthening by staged temperature control (plasticizing → mixing → final refining) and pressure matching, and the vulcanization process parameters are precisely matched to ensure the density gradient distribution of the crosslinking network, ultimately forming a three-dimensional network structure with both high strength and deformation adaptability. (5) This invention, through the synergistic design of the phase change behavior of thermoplastic elastomer and the creep characteristics of rubber matrix, endows the material with dynamic deformation recovery ability while ensuring high elasticity at room temperature, and adapts to repeated impact loads under complex road conditions. Attached Figure Description

[0018] Figure 1 This is a flowchart of a puncture-resistant and leak-proof tire made of polymer memory rubber according to the present invention. Detailed Implementation

[0019] To facilitate understanding of the present invention, the invention will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of protection of the present invention is not limited to the following specific embodiments.

[0020] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of the invention.

[0021] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this invention can be purchased from the market or prepared by existing methods.

[0022] Example 1 refer to Figure 1 The present invention discloses a puncture-resistant and leak-proof tire polymer memory rubber, comprising, by weight, the following components: 70 parts of base rubber component, wherein styrene-butadiene rubber has a Mooney viscosity of 60 and cis-butadiene rubber has a cis-structure content of 98%, with a mass ratio of 65:35; 25 parts of reinforcing filler component, wherein nano-silica particles have a diameter of 15nm and a specific surface area of ​​180m² / g, and aramid short fibers have a length of 4mm and a diameter of 8μm, with a mass ratio of 18:7; and 10 parts of memory function component, wherein polylactic acid is grafted with maleic anhydride at a grafting rate of... The content is 6.5%, and the styrene unit accounts for 28% of the mass of the styrene-butadiene-styrene block copolymer; the leak-proof functional component is 6 parts, of which the ultra-high molecular weight polyethylene fiber has a molecular weight of 1.5 million and a fineness of 2 denier, and the butyl rubber microspheres have a particle size of 8 μm and a Mooney viscosity of 40, with a mass ratio of 2.5:1.5; the additive component is 3 parts, of which sulfur accounts for 25% of the additive component, the accelerator N-cyclohexyl-2-benzothiazole sulfenamide accounts for 35%, and the antioxidant N-isopropyl-N'-phenyl-p-phenylenediamine accounts for 40%.

[0023] The preparation method of polymer memory rubber in this embodiment includes the following steps: S1. Styrene-butadiene rubber and butadiene rubber are put into an internal mixer and plasticized at 90°C for 18 minutes. S2. Add the mixture of nano-silica and aramid short fiber to the base rubber component after plasticizing in step S1, and continue to mix in the internal mixer at 90°C for 12 minutes. S3. Add the memory function component and the leak-proof function component to the mixed rubber compound obtained in step S2, adjust the internal mixer temperature to 100°C and continue mixing for 10 minutes; S4. Reduce the internal mixer temperature to 80°C, add the auxiliary components to the mixed rubber compound and perform final mixing for 6 minutes to obtain a homogeneous compound. S5. Transfer the rubber compound from step S4 into the molding die and pre-form it for 4 minutes under a pressure of 12MPa and a temperature of 85℃ to obtain a pre-formed rubber blank. S6. Transfer the preformed rubber blank from step S5 to a vulcanizing machine and vulcanize it for 20 minutes at 150°C and 15MPa. S7. After vulcanization, allow the product to cool naturally to room temperature, then trim the product to obtain the finished product.

[0024] Example 2 This embodiment is basically the same as Embodiment 1, except that the Mooney viscosity of styrene-butadiene rubber in the base rubber component is 50, the content of cis-butadiene rubber in the cis structure is 95%, and the mass ratio of the two is 60:40.

[0025] Example 3 This embodiment is basically the same as Embodiment 1, except that the nano-silica particles in the reinforcing filler component have a particle size of 10nm and a specific surface area of ​​150m² / g, and the aramid short fibers have a length of 3mm and a diameter of 5μm, with a mass ratio of 15:5.

[0026] Example 4 This embodiment is basically the same as Example 1, except that the grafting rate of polylactic acid to maleic anhydride in the memory functional component is 5%, and the mass ratio of styrene units in the styrene-butadiene-styrene block copolymer is 25%.

[0027] Example 5 This embodiment is basically the same as Embodiment 1, except that the ultra-high molecular weight polyethylene fiber in the leak-proof functional component has a molecular weight of 1 million and a fineness of 1 denier, and the butyl rubber microspheres have a particle size of 5 μm and a Mooney viscosity of 30, with a mass ratio of 2:1.

[0028] Example 6 This embodiment is basically the same as Embodiment 1, except that the amount of sulfur in the auxiliary components is 22%, the amount of accelerator is 32%, and the amount of antioxidant is 46%.

[0029] Comparative Example 1 A rubber, by weight, comprises the following components: 70 parts natural rubber, 30 parts styrene-butadiene rubber; 40 parts carbon black filler; 5 parts paraffin oil plasticizer; 3 parts zinc oxide; 2 parts stearic acid; 1.5 parts sulfur vulcanizing agent; 1 part accelerator DM; and 1.5 parts antioxidant RD.

[0030] The preparation method of the polymer memory rubber includes the following steps: S1. Mix natural rubber and styrene-butadiene rubber on a two-roll mill at room temperature for 10 minutes; S2. Add carbon black filler and paraffin oil plasticizer and continue mixing for 15 minutes; S3. Add zinc oxide, stearic acid, and antioxidant RD and mix for 8 minutes; S4. Finally, add sulfur vulcanizing agent and accelerator DM, mix for 5 minutes, and then sheet. S5. Place the rubber compound in a mold and vulcanize it at 150℃ and 10MPa pressure for 30 minutes; S6. Cooling and trimming yields the comparison sample.

[0031] Comparative Example 2 This comparative example is basically the same as Example 1, except that the addition of the memory function component and the leak-proof function component is completely omitted, while the proportions of the remaining components and the process parameters are the same as in Example 1.

[0032] The rubbers used in Examples 1-6 and Comparative Examples 1-2 were tested for tensile strength, elongation at break, tear strength, puncture shrinkage, and puncture pressure reduction. The results are shown in Table 1. Table 1: Experimental Results of Examples 1-6 and Comparative Examples 1-2

[0033] In summary, as shown in Table 1, Example 1 outperforms the Comparative Example in all performance indicators. Comparative Example 1, using a traditional natural rubber / styrene-butadiene rubber system with carbon black filler and conventional mixing and vulcanization processes, exhibits low mechanical properties and puncture resistance, and lacks self-healing capabilities. This indicates that traditional technical solutions cannot meet the requirements for high-performance puncture-resistant and leak-proof tires.

[0034] Comparative Example 2 omits the two core functional components of memory and leak prevention based on Example 1. Although its basic mechanical properties are better than those of Comparative Example 1 because it retains the reinforced filling system, it lacks the self-repair function of the puncture hole and its leak prevention performance is significantly deteriorated. Example 2 used a rubber with lower Mooney viscosity and lower cis structure content. Its mechanical properties and self-healing properties were slightly lower than those of Example 1, indicating that the molecular weight and microstructure of the base rubber are the cornerstone of ensuring the overall performance of the material, and the optimized ratio can provide the best balance between processability and mechanical properties.

[0035] Example 3 adjusted the specifications and proportions of the reinforcing filler components, using fillers with smaller particle sizes and lower aspect ratios. A slight decrease in mechanical properties and puncture resistance retention was observed, demonstrating that the specific particle size and high specific surface area of ​​nano-silica, along with the specific aspect ratio of aramid short fibers, are crucial for forming an effective stress transfer network and tear-resistant structure.

[0036] Example 4 adjusted the grafting rate and styrene content of the memory function component, resulting in a significant decrease in its self-healing performance, with a 24-hour puncture hole shrinkage rate of only 80%. This demonstrates that the grafting rate of polylactic acid to maleic anhydride and the styrene unit content in the styrene-butadiene-styrene block copolymer directly affect the triggering efficiency and recovery force of the memory effect, requiring precise control within a specific range to ensure that the material can respond quickly and complete self-healing at room temperature.

[0037] Example 5 adjusted the specifications and ratio of the leak-proof functional components, and its leak-proof performance, especially the pressure retention rate after multiple punctures, showed a significant decrease, with the tire pressure dropping by 7.0% after the tenth puncture. This indicates that the molecular weight of ultra-high molecular weight polyethylene fibers and the elasticity of butyl rubber microspheres are key to forming an effective leak-proof barrier, and weakening either one will lead to an accelerated decline in the sealing performance of the material under repeated damage.

[0038] Example 6 adjusted the ratio of the additive components, and its performance was closest to that of Example 1, with only slight fluctuations. This shows that adjusting the ratio of the vulcanization system and the antioxidant within the preferred range can still ensure that the material obtains sufficient crosslinking density and anti-aging properties, maintain the stability of the overall function, and demonstrate the tolerance and wide process window of the formulation system of this invention.

Claims

1. A puncture-resistant and leak-proof tire made of polymer memory rubber, characterized in that: By weight, it contains the following components: 60-80 parts of base rubber, 20-30 parts of reinforcing filler, 5-15 parts of memory function component, 3-10 parts of leak-proof function component, and 1-5 parts of additive component. The basic rubber component is a mixture of styrene-butadiene rubber and butadiene rubber. The Mooney viscosity of the styrene-butadiene rubber is 50-70, the cis-1,4-structure content of the butadiene rubber is ≥95%, and the mass ratio of styrene-butadiene rubber to butadiene rubber is 60-70:30-40. The reinforcing filler component is a mixture of nano-silica and aramid short fibers. The nano-silica has a particle size of 10-20 nm and a specific surface area of ​​150-200 m² / g. The aramid short fibers have a length of 3-5 mm and a diameter of 5-10 μm. The mass ratio of nano-silica to aramid short fibers is 15-20:5-8. The memory function component is a polylactic acid-grafted maleic anhydride-modified thermoplastic elastomer with a grafting rate of 5-8% and the thermoplastic elastomer is a styrene-butadiene-styrene block copolymer. The leak-proof functional component is a mixture of ultra-high molecular weight polyethylene fiber and butyl rubber microspheres. The ultra-high molecular weight polyethylene fiber has a molecular weight of 1-2 million and a fineness of 1-3 denier. The butyl rubber microspheres have a particle size of 5-10 μm and a Mooney viscosity of 30-50. The mass ratio of ultra-high molecular weight polyethylene fiber to butyl rubber microspheres is 2-3:1-2. The auxiliary components include vulcanizing agents, accelerators, and antioxidants.

2. The polymer memory rubber for puncture-resistant and leak-proof tires as described in claim 1, characterized in that: The Mooney viscosity of the styrene-butadiene rubber is 55-65; the content of the cis-1,4-structure in the cis-butadiene rubber is ≥97%.

3. The polymer memory rubber for a puncture-resistant and leak-proof tire as described in claim 1, characterized in that: The nano-silica has a particle size of 12-18 nm and a specific surface area of ​​160-190 m² / g; the aramid short fibers have a length of 3.5-4.5 mm and a diameter of 6-9 μm.

4. The polymer memory rubber for a puncture-resistant and leak-proof tire as described in claim 1, characterized in that: The grafting rate of polylactic acid grafted with maleic anhydride is 6-7%; the mass percentage of styrene units in the styrene-butadiene-styrene block copolymer is 25-30%.

5. The polymer memory rubber for puncture-resistant and leak-proof tires as described in claim 1, characterized in that: The ultra-high molecular weight polyethylene fiber has a molecular weight of 1.2-1.8 million and a fineness of 1.5-2.5 denier. The butyl rubber microspheres have a particle size of 6-9 μm and a Mooney viscosity of 35-45.

6. The polymer memory rubber for a puncture-resistant and leak-proof tire as described in claim 1, characterized in that: The vulcanizing agent in the auxiliary component is sulfur, and the amount used is 22-28% of the auxiliary component; the accelerator is N-cyclohexyl-2-benzothiazole sulfenamide, and the amount used is 32-38% of the auxiliary component; the antioxidant is N-isopropyl-N'-phenyl-p-phenylenediamine, and the amount used is 32-48% of the auxiliary component.

7. The polymer memory rubber for puncture-resistant and leak-proof tires as described in claim 1, characterized in that: The preparation method of the polymer memory rubber, Includes the following steps, S1. Mix styrene-butadiene rubber and butadiene rubber in a certain proportion and add them to an internal mixer. Plasticize at a temperature of 80-100℃ for 15-20 minutes. S2. Add a mixture of nano-silica and aramid short fibers to the base rubber component after plasticizing in step S1, and continue to mix in the internal mixer at 80-100℃ for 10-15 minutes. S3. Add the memory function component and the leak-proof function component to the mixed rubber compound obtained in step S2, and adjust the internal mixer temperature to 90-110℃ and continue mixing for 8-12 minutes. S4. Reduce the internal mixer temperature to 70-90℃, add the auxiliary components to the mixed rubber compound, and perform final mixing for 5-8 minutes to obtain a homogeneous compound. S5. Transfer the compound obtained in step S4 into the molding die, and pre-form it for 3-5 minutes under a pressure of 10-15MPa and a temperature of 80-95℃ to obtain a pre-formed rubber blank. S6. Transfer the preformed rubber blank from step S5 to a vulcanizing machine and vulcanize it at a temperature of 140-160℃ and a pressure of 10-18MPa for 15-25 minutes. S7. After vulcanization in step S6, allow the product to cool naturally to room temperature, trim the product, and obtain puncture-resistant and leak-proof high-molecular memory rubber for tires.

8. The polymer memory rubber for puncture-resistant and leak-proof tires as described in claim 1, characterized in that: The rubber has a tensile strength ≥19MPa, an elongation at break ≥420%, and a tear strength ≥52kN / m.

9. The polymer memory rubber for a puncture-resistant and leak-proof tire as described in claim 1, characterized in that: After the rubber is punctured with a steel needle with a diameter of 1.5 mm, the shrinkage rate of the puncture hole is ≥70% after being placed at 25°C for 12 hours, and ≥85% after being placed for 24 hours.

10. The polymer memory rubber for a puncture-resistant and leak-proof tire as described in claim 1, characterized in that: The rubber was punctured 10 times continuously with a steel needle of 1.5 mm diameter at a speed of 50 mm / s. After the first puncture, the internal pressure of the tire decreased by ≤3%, and after the tenth puncture, the internal pressure of the tire decreased by ≤5%.

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