Rubber composition for tires and preparation method thereof

Abstract

The invention relates to the field of rubber materials, in particular to a rubber composition for tires and a preparation method of the rubber composition. The rubber composition for the tire comprises a matrix rubber layer, and the matrix rubber layer comprises the following substances in parts by weight: 60-70 parts of a wear-resistant rubber matrix; 40-50 parts of a wetland reinforcing agent; 1-3 parts of a functional auxiliary agent; the wetland reinforcing agent is white carbon black particles with the specific surface area of 200-220m < 2 > / g and the primary particle size of 15-20nm. The core component of the matrix rubber layer of the rubber composition for the tire is limited, a combined system of the wear-resistant rubber matrix, the wet land reinforcing agent and the functional additive is defined, white carbon black with specific structural characteristics is selected as the wet land reinforcing agent, and the structural advantages of the white carbon black are utilized, so that the interaction between a rubber material and a water film can be enhanced, and the wear-resistant performance of the rubber composition is improved. The wet land gripping effect is improved, a stable combination network can be formed with a rubber matrix, and abrasion is reduced; the functional additive assists in optimizing the overall performance, and the three components cooperate to form a basic system with dual core performance.

Description

Technical Field

[0001] This invention relates to the field of rubber materials, and more specifically to a rubber composition for tires and its preparation method. Background Technology

[0002] As the core component of a vehicle in contact with the ground, tires directly affect driving safety, comfort, and lifespan. Wet grip and wear resistance are two key indicators of tire rubber composition. The former relates to braking response and handling stability on slippery roads, while the latter determines the tire's service life and fuel economy. However, in traditional tire rubber compositions, these two properties have always been inherently contradictory. Improving wet grip often requires sacrificing wear resistance, and vice versa, becoming a core bottleneck restricting tire technology upgrades.

[0003] In existing technologies, hydrophilic reinforcing materials are often used to optimize the interaction between the rubber compound and the water film in order to improve wet performance. However, these materials often have poor compatibility with the rubber matrix, which can easily lead to a loose rubber compound structure and a significant decrease in abrasion resistance. To enhance abrasion resistance, high-structure reinforcing agents are often used to build a dense support network, but this reduces the elasticity and hydrophilicity of the rubber compound, thus impairing wet grip performance. Some solutions attempt to balance the two by adjusting the raw material ratio or by using single modification methods, but these fail to fundamentally resolve the performance conflict and can only achieve limited performance improvements, failing to meet the vehicle's demand for high-safety, long-life tires. At the same time, in the design of multi-layer tires, problems such as weak interlayer bonding and poor functional transmission further exacerbate performance shortcomings, resulting in poor overall tire performance. Summary of the Invention

[0004] In view of the technical problems existing in the prior art, the present invention provides a rubber composition for tires and a method for preparing the same.

[0005] A rubber composition for tires and its preparation method, comprising the following technical solutions: In a first aspect, this application discloses a rubber composition for tires using the following technical solution: A rubber composition for tires includes a matrix rubber layer comprising the following components by weight: 60-70 parts abrasion-resistant rubber matrix; 40-50 parts a wet-weather reinforcing agent; and 1-3 parts a functional additive; wherein the wet-weather reinforcing agent has a specific surface area of ​​200-220 m². 2 / g, silica particles with a native particle size of 15-20nm.

[0006] Through the above technical solution, this application defines the core components of the matrix rubber layer of the tire rubber composition, clarifies the combination system of abrasion-resistant rubber matrix, wet grip reinforcing agent, and functional additives, and selects silica with specific structural characteristics as the wet grip reinforcing agent, utilizing its own structural advantages to simultaneously take into account both wet grip and basic reinforcement functions. The abrasion-resistant rubber matrix provides good elasticity and mechanical support for the rubber compound, serving as the foundation for performance; the wet grip reinforcing agent, through its special structural morphology, can enhance the interaction between the rubber compound and the water film, improving wet grip, and can also form a stable bonding network with the rubber matrix, reducing wear; the functional additives help optimize the overall performance, and the three work together to constitute a basic system that takes into account both core performances.

[0007] Furthermore, the wetland reinforcing agent also includes a modified layer, which coats the surface of the silica particles. The wetland reinforcing agent is manufactured using the following technical solution: Silica is added to anhydrous ethanol, ultrasonically dispersed to form a suspension, heated and a silane coupling agent is added, the reaction is refluxed and then cooled, hydroxyethyl phosphonate is added, and the reaction is continued at the temperature; after filtration and vacuum drying, the wetland reinforcing agent can be prepared.

[0008] Through the above technical solution, this application further defines the modified layer structure and preparation method of wetland reinforcing agents. Addressing the problems of poor compatibility and easy agglomeration of traditional silica with the rubber matrix, a core-shell structured composite reinforcing agent is constructed by coating the surface of silica particles with a modified layer. In the preparation process, a silane coupling agent is first used to achieve chemical bonding between silica and the rubber matrix, and then hydroxyethyl phosphonate is introduced to optimize surface properties. This dual modification approach solves the dispersion problem of silica and enhances its hydrophilicity and reinforcing effect. The presence of the modified layer allows the wetland reinforcing agent to not only leverage its structural advantages but also tightly bind to the rubber molecular chains through a dual mechanism of chemical action and physical entanglement, avoiding performance fluctuations caused by reinforcing agent agglomeration. This technical solution, through precise modification process design, achieves a synergistic improvement in the hydrophilicity, compatibility, and reinforcing properties of the wetland reinforcing agent, breaking through the limitations of traditional single silica modification and providing key technical support for the dual performance optimization of the matrix rubber layer.

[0009] Furthermore, the wear-resistant rubber matrix is ​​an isoprene-butadiene copolymer rubber.

[0010] Through the above technical solution, this application specifies that the wear-resistant rubber matrix is ​​isoprene-butadiene copolymer rubber, representing a precise and optimized selection of the matrix rubber. This solution, based on the structural characteristics of isoprene-butadiene copolymer rubber, specifically addresses the problem of traditional rubber matrices failing to simultaneously achieve both elasticity and wear resistance. This type of copolymer rubber combines the structural advantages of both monomers, possessing both good elasticity and low-temperature performance, adapting to the flexibility required for wet grip, and a certain level of mechanical strength and wear resistance, allowing it to synergize with wet-weather reinforcing agents. Compared to traditional single-rubber matrices, its structure more readily interacts with the modified layer of wet-weather reinforcing agents, promoting uniform dispersion of the reinforcing agent in the rubber compound and avoiding localized performance shortcomings.

[0011] Furthermore, the tire rubber composition further includes a wear-resistant support layer, which is disposed inside the base rubber layer and comprises the following components by weight: 50-80 parts of wear-resistant support layer rubber matrix; 35-50 parts of wear-resistant proppant; Functional additives 1-3 parts; The wear-resistant proppant is a porous hierarchical carbon black / lignin composite particle with a porosity of 35%-40% and a pore size distribution of 20-200nm.

[0012] Through the above technical solution, this application constructs a two-layer structure combining a base rubber layer and a wear-resistant support layer by adding a wear-resistant support layer. This solution breaks through the design limitations of traditional single-layer rubber compounds, rationally dividing and synergizing functions: the base rubber layer focuses on wet grip performance, while the wear-resistant support layer focuses on enhancing overall wear resistance and structural support. The wear-resistant support agent uses porous, hierarchical carbon black / lignin composite particles. Its special porous structure can form an anchoring effect with the rubber molecular chains, significantly improving the wear resistance and mechanical strength of the rubber compound. At the same time, the properties of lignin endow it with a certain functional transfer capability, achieving performance synergy with the base rubber layer. The addition of the wear-resistant support layer not only solves the core problem of functional conflict in single-layer rubber compounds but also improves the overall stability and service life of the tire through structural reinforcement, avoiding performance degradation caused by excessive surface wear.

[0013] Furthermore, the wear-resistant proppant is manufactured using the following technical solution: Alkali lignin was added to propylene oxide and reacted at 100-110℃ and 0.2-0.5MPa for 1-3 hours to obtain modified lignin; carbon black and modified lignin were mixed, deionized water was added, and ultrasonic dispersion was performed to form a uniform slurry; Spray drying yields porous particles; the particles are added to a high-speed mixer, heated to 95°C, and MAH-g-PB and silane coupling agent are added. After stirring and mixing, and cooling, a wear-resistant proppant is obtained.

[0014] Through the above technical solution, this application defines a method for preparing a wear-resistant proppant. Addressing the problems of poor dispersibility and weak bonding with the rubber matrix in traditional wear-resistant reinforcing agents, this method optimizes the compatibility of lignin with carbon black by modifying it with propylene oxide; then, ultrasonic dispersion and spray drying are used to construct a porous hierarchical structure, providing space for anchoring the rubber molecular chains; finally, composite modification with maleic anhydride-grafted polybutadiene and silane coupling agents strengthens the chemical bond between the wear-resistant proppant and the rubber matrix. The entire preparation process is progressive, ensuring the porous structure of the wear-resistant proppant while solving its dispersibility and interfacial bonding problems, allowing the wear-resistant proppant to fully exert its wear-resistant and support functions. This preparation method is not a simple combination of conventional processes in the field, but a precise design based on the structural requirements and performance goals of the wear-resistant proppant. Each step ensures the final performance, further enhancing the technical advantages of the wear-resistant support layer and laying a key foundation for improving the overall performance of the composition.

[0015] Furthermore, the wear-resistant support layer rubber matrix is ​​a mixture of styrene-butadiene rubber and natural rubber in a mass ratio of 1:2-3.

[0016] Through the above technical solution, this application further optimizes the rubber matrix of the wear-resistant support layer as a specific ratio mixture of styrene-butadiene rubber (SBR) and natural rubber, specifically addressing the issue of balancing the support force and flexibility of the wear-resistant support layer. Natural rubber possesses excellent elasticity and mechanical strength, providing good structural toughness for the support layer; SBR, on the other hand, has excellent wear resistance and compatibility, enabling it to synergistically interact with the wear-resistant proppant to enhance the wear resistance effect. The specific ratio of the mixture design ensures that the rubber matrix has sufficient support strength to withstand mechanical stress during driving, while retaining appropriate elasticity to prevent cracking of the rubber compound due to excessive rigidity. Compared to a single rubber matrix, this mixed system is more suitable for the performance requirements of porous, hierarchical wear-resistant proppants, promoting uniform dispersion and interfacial bonding of the proppant, and maximizing the function of the wear-resistant support layer.

[0017] Furthermore, the tire rubber composition further includes a compatibility layer disposed between the base rubber layer and the wear-resistant support layer, the compatibility layer comprising the following components by weight: 15-30 parts of maleic anhydride-grafted polybutadiene rubber; 0.5-1.2 parts of aminosilane; 0.2-0.8 parts of epoxy silane.

[0018] Through the above technical solution, this application adds a compatibility layer to solve the interlayer bonding problem in multilayer structures. In traditional multilayer rubber compositions, due to differences in composition and performance, different layers of rubber are prone to interlayer delamination and weak bonding, leading to overall performance degradation. This solution uses maleic anhydride-grafted polybutadiene rubber as the compatibility layer substrate. The active groups in its molecular structure can chemically react with the wet-wet reinforcing agent of the matrix rubber layer and the wear-resistant support agent of the wear-resistant support layer. At the same time, the combination of aminosilane and epoxysilane forms bridging bonds, further strengthening the interlayer chemical bonding. The compatibility layer not only achieves a tight bond between the two rubber layers but also promotes functional transfer, enabling the wet-wet properties of the matrix rubber layer and the wear-resistant properties of the wear-resistant support layer to form a synergistic effect, avoiding performance shortcomings caused by interlayer separation.

[0019] Secondly, this application provides a method for preparing a rubber composition for tires, employing the following technical solution: A method for preparing a rubber composition for tires includes the following preparation steps: The materials in the base rubber layer, wear-resistant support layer and compatibility layer are placed in an internal mixer and mixed separately to obtain the base rubber layer compound, wear-resistant support layer compound and compatibility layer compound. A three-layer co-extrusion equipment is used, and the extrusion temperature is controlled at 100-110℃. After extrusion molding, the material is pre-vulcanized at 140-150℃ for 8-15 minutes. The tire rubber composition can be prepared by taking the pre-vulcanized material and subjecting it to final vulcanization treatment at 155-165℃ for 10-15 minutes.

[0020] Through the above technical solution, this application defines a complete preparation method for tire rubber compositions. Separate mixing ensures uniform dispersion of components in each layer of the rubber compound, avoiding interference between components of different performance systems. The three-layer co-extrusion process ensures uniform thickness and tight bonding of each layer, achieving precise structural molding. Segmented vulcanization, through the combination of pre-vulcanization and final vulcanization, ensures sufficient formation of interlayer chemical bonds and precisely controls the crosslinking density of each layer. Moderate crosslinking of the matrix rubber layer retains elasticity and wet grip performance, while high-density crosslinking of the abrasion-resistant support layer enhances abrasion resistance and support. The entire preparation process is highly compatible with the structural design and component characteristics of the composition. Each step provides process assurance for performance optimization, avoiding performance imbalances caused by single parameters in traditional processes. This preparation method is not a simple application of conventional processes, but a precise design based on the structural and performance requirements of the composition, ensuring the industrial feasibility and performance stability of the technical solution, and providing key process support for achieving synergistic improvement in wet performance and abrasion resistance.

[0021] In summary, this application has the following beneficial effects: First, this application achieves simultaneous optimization of wet grip performance and wear resistance through precise component selection and structural design, breaking through the performance bottleneck of traditional tire rubber compositions where one aspect gains at the expense of the other. The matrix rubber layer uses a wet reinforcing agent with a specific structure, which, after double modification, strengthens the interaction between the rubber compound and the water film, improving grip and braking response on wet surfaces, while also reducing wear through close bonding with the rubber matrix. The wear-resistant support layer uses a porous, graded composite support agent to construct a stable mechanical support network, ensuring support strength while also ensuring functional transfer. The two layers work together synergistically, enabling the tire to have reliable handling stability on wet surfaces, while extending its service life and significantly enhancing the core value of the tire, meeting the vehicle's performance requirements for high safety and long lifespan.

[0022] Secondly, this application utilizes a three-layer structure consisting of a base rubber layer, a compatibility layer, and a wear-resistant support layer, ensuring synergistic and stable performance at the structural level. The compatibility layer forms chemical bonds with the two rubber layers through active groups, completely resolving issues such as interlayer delamination and weak bonding that are common in traditional multilayer structures, achieving tight interlayer connection and smooth functional transfer. The precise matching of the rubber matrix, reinforcing agents, and proppants at each level not only improves individual performance indicators but also optimizes the elasticity, toughness, and anti-aging capabilities of the rubber compound. This allows the tire to maintain stable performance under various driving conditions, effectively resisting external influences such as mechanical stress and temperature changes during driving, reducing early damage phenomena such as uneven wear and cracking, and significantly improving the tire's reliability and overall service performance.

[0023] Third, this application utilizes conventional raw materials and mature production processes common in the tire industry, eliminating the need for specialized production equipment and complex process modifications. This lowers the technical barriers and cost inputs for large-scale production, demonstrating strong potential for industrial-scale promotion. The selection of raw materials incorporates renewable lignin components, replacing some petrochemical-based reinforcing materials, reducing dependence on non-renewable resources and lowering the environmental impact of the production process, aligning with environmental protection trends. During production, the components exhibit good dispersion, and process parameters are easily controlled, effectively improving product qualification rates and production stability while reducing production costs and resource waste. The extended product lifespan further reduces tire replacement frequency, lowering user costs and reducing the environmental pressure from discarded tires, achieving a harmonious balance of technological, economic, and environmental value. Detailed Implementation

[0024] The present application will be further described in detail below with reference to the embodiments.

[0025] Preparation Example 1 Wetland reinforcement agent 1 Specific surface area of ​​200-220m 2 / g, silica particles with a native particle size of 15-20nm were added to anhydrous ethanol to prepare a suspension with a mass fraction of 15%, and ultrasonically dispersed at 200W power for 25min; the suspension was heated to 90℃, 3% of silica mass of silane coupling agent was added, refluxed for 50min, cooled to 80℃, and then 1.5% of silica mass of hydroxyethyl phosphonate was added, and the reaction was continued at the temperature for 40min; after the reaction was completed, the mixture was filtered, and the filter residue was vacuum dried at 110℃ for 1.5h to obtain wetland reinforcing agent 1.

[0026] Preparation Example 2 Wetland reinforcement agent 2 Specific surface area of ​​200-220m 2 / g, silica particles with a native particle size of 15-20nm were added to anhydrous ethanol to prepare a suspension with a mass fraction of 20%, and ultrasonically dispersed at 250W for 30min; the suspension was heated to 97℃, 4% of silica mass of silane coupling agent was added, refluxed for 60min, cooled to 85℃, and then 2% of silica mass of hydroxyethyl phosphonate was added, and the reaction was continued at the temperature for 45min; after the reaction was completed, the mixture was filtered, and the filter residue was vacuum dried at 120℃ for 2h to obtain wetland reinforcing agent 2.

[0027] Preparation Example 3 Wetland reinforcement agent 3 Specific surface area of ​​200-220m 2 / g, silica particles with a native particle size of 15-20nm were added to anhydrous ethanol to prepare a suspension with a mass fraction of 25%, and ultrasonically dispersed at 300W for 35min; the suspension was heated to 105℃, 5% of silica mass of silane coupling agent was added, refluxed for 70min, cooled to 90℃, and then 2.5% of silica mass of hydroxyethyl phosphonate was added, and the reaction was continued at the temperature for 50min; after the reaction was completed, the mixture was filtered, and the filter residue was vacuum dried at 130℃ for 2.5h to obtain wetland reinforcing agent 3.

[0028] Preparation Example 4 Isoprene and butadiene were mixed at a mass ratio of 3:7. Cyclohexane or n-hexane was used as a solvent, and 0.01% of n-butyllithium initiator (by mass of total monomers) was added. Anionic polymerization was carried out at 50°C for 2 hours under nitrogen protection. During the reaction, 0.1% tetrahydrofuran (a structure modifier) ​​could be added. Methanol or ethanol-based terminator was added to terminate the polymerization at the reaction endpoint. The product was then subjected to coagulation and water washing to remove solvent and impurities, and then vacuum dried at 90°C for 2 hours to obtain isoprene-butadiene copolymer rubber.

[0029] Preparation Example 5 Wear-resistant proppant 1 Alkali lignin was added to 20% of its mass of propylene oxide and reacted at 100℃ and 0.2MPa for 1 hour to obtain modified lignin. Carbon black and modified lignin were mixed at a mass ratio of 85:15, and deionized water was added to prepare a mixture with a solid-liquid ratio of 1:4. The mixture was ultrasonically dispersed at 200W power for 30 minutes to form a uniform slurry. The slurry was spray-dried at an inlet temperature of 170℃ and an outlet temperature of 75℃ to obtain porous particles. The porous particles were added to a high-speed mixer, heated to 95℃, and 4% of the total mass of maleic anhydride-grafted polybutadiene and 2% of silane coupling agent KH-560 were added. After stirring for 30 minutes, the mixture was cooled to obtain wear-resistant proppant 1.

[0030] Preparation Example 6 Wear-resistant proppant 2 Alkali lignin was added to 30% of its mass of propylene oxide and reacted at 105℃ and 0.3MPa for 2 hours to obtain modified lignin. Carbon black and modified lignin were mixed at a mass ratio of 9:1, and deionized water was added to prepare a mixture with a solid-liquid ratio of 1:5. The mixture was ultrasonically dispersed at 250W power for 35 minutes to form a uniform slurry. The slurry was spray-dried at an inlet temperature of 180℃ and an outlet temperature of 80℃ to obtain porous particles. The porous particles were added to a high-speed mixer, heated to 95℃, and 5% of maleic anhydride-grafted polybutadiene and 3% of silane coupling agent KH-560 were added. After stirring for 45 minutes and cooling, wear-resistant support agent 2 was obtained.

[0031] Preparation Example 7 Wear-resistant proppant 3 Alkali lignin was added to 40% of its mass of propylene oxide and reacted at 110℃ and 0.5MPa for 3 hours to obtain modified lignin. Carbon black and modified lignin were mixed at a mass ratio of 95:5, and deionized water was added to prepare a mixture with a solid-liquid ratio of 1:6. The mixture was ultrasonically dispersed at 300W power for 40 minutes to form a uniform slurry. The slurry was spray-dried at an inlet temperature of 190℃ and an outlet temperature of 85℃ to obtain porous particles. The porous particles were added to a high-speed mixer, heated to 95℃, and 6% of maleic anhydride-grafted polybutadiene and 4% of silane coupling agent KH-560 were added. After stirring for 60 minutes and cooling, wear-resistant support agent 3 was obtained.

[0032] Preparation Example 8 Styrene-butadiene rubber and natural rubber were mixed at a mass ratio of 1:2 to prepare the wear-resistant support layer rubber matrix 1.

[0033] Preparation Example 9 Styrene-butadiene rubber and natural rubber were mixed at a mass ratio of 1:3 to prepare the wear-resistant support layer rubber matrix 2.

[0034] Preparation Example 10 Functional additives: The functional additive was prepared by mixing 5 kg of zinc oxide, 2 kg of sulfur, 1 kg of accelerator CBS, 2 kg of stearic acid, 6 kg of environmentally friendly aromatic oil KN4010, 2.0 kg of antioxidant 4020 and 1.0 kg of antioxidant RD.

[0035] Example 1 A rubber composition for tires includes a base rubber layer, the base rubber layer comprising the following substances: 60kg isoprene-butadiene copolymer rubber; 40kg wetland reinforcing agent; 1kg functional additives; A method for preparing a rubber composition for tires includes the following steps: Take the base rubber layer material and put it into an internal mixer for internal mixing. Plasticize at an initial temperature of 50°C for 5 minutes. Then add wet reinforcing agent 1 and functional additives, heat up to 110°C and mix for 8 minutes. After cooling down to 75°C, add sulfur, accelerator CBS and other functional additives, and continue mixing to obtain the base rubber layer compound. The tire rubber composition is prepared by using an extrusion device, controlling the extrusion temperature at 100℃, and then pre-curing the extruded material at 140℃ for 8 minutes. The pre-cured material is then taken and subjected to final curing at 155℃ for 10 minutes.

[0036] Example 2 A rubber composition for tires includes a base rubber layer, the base rubber layer comprising the following substances: 65kg isoprene-butadiene copolymer rubber; 45kg wetland reinforcing agent 2kg; 2kg functional additives; A method for preparing a rubber composition for tires includes the following steps: The base rubber layer material was placed in an internal mixer for internal mixing. The mixture was plasticized at an initial temperature of 55°C for 6 minutes. Then, wet reinforcing agent 2 and functional additives were added. The mixture was heated to 115°C and mixed for 10 minutes. After cooling to 80°C, sulfur, accelerator CBS and other functional additives were added. The mixture was then further mixed to obtain the base rubber layer compound. The tire rubber composition is prepared by using an extrusion device, controlling the extrusion temperature at 105℃, and then pre-curing the extruded material at 145℃ for 11 minutes. The pre-cured material is then taken and subjected to final curing at 160℃ for 12 minutes.

[0037] Example 3 A rubber composition for tires includes a base rubber layer, the base rubber layer comprising the following substances: 70kg isoprene-butadiene copolymer rubber; 50kg wetland reinforcing agent; 3kg functional additives; A method for preparing a rubber composition for tires includes the following steps: Take the base rubber layer material and put it into an internal mixer for internal mixing. Plasticize at an initial temperature of 60°C for 7 minutes. Then add wet reinforcing agent 1 and functional additives, heat to 120°C and mix for 12 minutes. After cooling to 85°C, add sulfur, accelerator CBS and other functional additives, and continue mixing to obtain the base rubber layer compound. The tire rubber composition is prepared by using an extrusion device, controlling the extrusion temperature at 110℃, and then pre-curing the extruded material at 150℃ for 15 minutes. The pre-cured material is then taken and subjected to final curing at 165℃ for 15 minutes.

[0038] Example 4 A rubber composition for tires includes a base rubber layer and a wear-resistant support layer, wherein the base rubber layer comprises the following substances: 65kg isoprene-butadiene copolymer rubber; 45kg wetland reinforcing agent 2kg; 2kg functional additives; The wear-resistant support layer includes the following materials: 50kg of wear-resistant support layer rubber matrix, 35kg of wear-resistant support agent 1 and 1kg of functional additives; A method for preparing a rubber composition for tires includes the following steps: The base rubber layer material was placed in an internal mixer for internal mixing. The mixture was plasticized at an initial temperature of 55°C for 6 minutes. Then, wet reinforcing agent 2 and functional additives were added. The mixture was heated to 115°C and mixed for 10 minutes. After cooling to 80°C, sulfur, accelerator CBS and other functional additives were added. The mixture was then further mixed to obtain the base rubber layer compound. Next, take the wear-resistant support layer material and put it into an internal mixer for internal mixing. Plasticize at an initial temperature of 60°C for 5 minutes. Then add wear-resistant support agent 1 and functional additives, heat to 120°C and mix for 8 minutes. After cooling to 75°C, add sulfur, accelerator CBS and other vulcanization system components, and continue mixing for 4 minutes. Collect the wear-resistant support layer compound. The tire rubber composition is prepared by using a double-layer extrusion equipment, controlling the extrusion temperature at 105℃, and then pre-curing the extruded material at 145℃ for 11 minutes. The pre-cured material is then taken and subjected to final curing at 160℃ for 12 minutes.

[0039] Example 5 A rubber composition for tires includes a base rubber layer and a wear-resistant support layer, wherein the base rubber layer comprises the following substances: 65kg isoprene-butadiene copolymer rubber; 45kg wetland reinforcing agent 2kg; 2kg functional additives; The wear-resistant support layer includes the following materials: 65kg of wear-resistant support layer rubber matrix, 42kg of wear-resistant support agent 2 and 2kg of functional additives; A method for preparing a rubber composition for tires includes the following steps: The base rubber layer material was placed in an internal mixer for internal mixing. The mixture was plasticized at an initial temperature of 55°C for 6 minutes. Then, wet reinforcing agent 2 and functional additives were added. The mixture was heated to 115°C and mixed for 10 minutes. After cooling to 80°C, sulfur, accelerator CBS and other functional additives were added. The mixture was then further mixed to obtain the base rubber layer compound. Next, take the wear-resistant support layer material and put it into an internal mixer for internal mixing. Plasticize at an initial temperature of 65°C for 6 minutes. Then add wear-resistant support agent 2 and functional additives, heat to 125°C and mix for 10 minutes. After cooling to 80°C, add sulfur, accelerator CBS and other vulcanization system components, and continue mixing for 5 minutes. Collect the wear-resistant support layer compound. The tire rubber composition is prepared by using a double-layer extrusion equipment, controlling the extrusion temperature at 105℃, and then pre-curing the extruded material at 145℃ for 11 minutes. The pre-cured material is then taken and subjected to final curing at 160℃ for 12 minutes.

[0040] Example 6 A rubber composition for tires includes a base rubber layer and a wear-resistant support layer, wherein the base rubber layer comprises the following substances: 65kg isoprene-butadiene copolymer rubber; 45kg wetland reinforcing agent 2kg; 2kg functional additives; The wear-resistant support layer includes the following materials: 80kg of wear-resistant support layer rubber matrix, 50kg of wear-resistant support agent, and 3kg of functional additives; A method for preparing a rubber composition for tires includes the following steps: The base rubber layer material was placed in an internal mixer for internal mixing. The mixture was plasticized at an initial temperature of 55°C for 6 minutes. Then, wet reinforcing agent 2 and functional additives were added. The mixture was heated to 115°C and mixed for 10 minutes. After cooling to 80°C, sulfur, accelerator CBS and other functional additives were added. The mixture was then further mixed to obtain the base rubber layer compound. The wear-resistant support layer material was then placed in an internal mixer for internal mixing. The mixture was plasticized at an initial temperature of 70°C for 8 minutes. Then, wear-resistant support agent 1 and functional additives were added. The mixture was heated to 130°C and mixed for 12 minutes. After cooling to 85°C, sulfur, accelerator CBS and other vulcanization system components were added. The mixture was then mixed for another 6 minutes, and the wear-resistant support layer compound was collected. The tire rubber composition is prepared by using a double-layer extrusion equipment, controlling the extrusion temperature at 105℃, and then pre-curing the extruded material at 145℃ for 11 minutes. The pre-cured material is then taken and subjected to final curing at 160℃ for 12 minutes.

[0041] Example 7 A rubber composition for tires includes a base rubber layer, a compatibility layer, and a wear-resistant support layer. The base rubber layer comprises the following substances: 65kg isoprene-butadiene copolymer rubber; 45kg wetland reinforcing agent 2kg; 2kg functional additives; The compatibility layer includes the following materials: 15 kg maleic anhydride-grafted butadiene rubber, 0.5 kg aminosilane, and 0.2 kg epoxysilane; The wear-resistant support layer includes the following materials: 65kg of wear-resistant support layer rubber matrix, 42kg of wear-resistant support agent 2 and 2kg of functional additives; A method for preparing a rubber composition for tires includes the following steps: The base rubber layer material was placed in an internal mixer for internal mixing. The mixture was plasticized at an initial temperature of 55°C for 6 minutes. Then, wet reinforcing agent 2 and functional additives were added. The mixture was heated to 115°C and mixed for 10 minutes. After cooling to 80°C, sulfur, accelerator CBS and other functional additives were added. The mixture was then further mixed to obtain the base rubber layer compound. Next, take the wear-resistant support layer material and put it into an internal mixer for internal mixing. Plasticize at an initial temperature of 65°C for 6 minutes. Then add wear-resistant support agent 2 and functional additives, heat to 125°C and mix for 10 minutes. After cooling to 80°C, add sulfur, accelerator CBS and other vulcanization system components, and continue mixing for 5 minutes. Collect the wear-resistant support layer compound. Then, take the compatibility layer material, maleic anhydride-grafted butadiene rubber, and place it in a two-roll mill. Add 1.2 kg of aminosilane KH-550 and 0.8 kg of epoxysilane KH-560 at 75°C and mix for 5 minutes to obtain the compatibility layer compound. The tire rubber composition is prepared by using a double-layer extrusion equipment, controlling the extrusion temperature at 105℃, and then pre-curing the extruded material at 145℃ for 11 minutes. The pre-cured material is then taken and subjected to final curing at 160℃ for 12 minutes.

[0042] Example 8 A rubber composition for tires includes a base rubber layer, a compatibility layer, and a wear-resistant support layer. The base rubber layer comprises the following substances: 65kg isoprene-butadiene copolymer rubber; 45kg wetland reinforcing agent 2kg; 2kg functional additives; The compatibility layer includes the following materials: 22 kg maleic anhydride-grafted butadiene rubber, 0.7 kg aminosilane, and 0.5 kg epoxysilane; The wear-resistant support layer includes the following materials: 65kg of wear-resistant support layer rubber matrix, 42kg of wear-resistant support agent 2 and 2kg of functional additives; A method for preparing a rubber composition for tires includes the following steps: The base rubber layer material was placed in an internal mixer for internal mixing. The mixture was plasticized at an initial temperature of 55°C for 6 minutes. Then, wet reinforcing agent 2 and functional additives were added. The mixture was heated to 115°C and mixed for 10 minutes. After cooling to 80°C, sulfur, accelerator CBS and other functional additives were added. The mixture was then further mixed to obtain the base rubber layer compound. Next, take the wear-resistant support layer material and put it into an internal mixer for internal mixing. Plasticize at an initial temperature of 65°C for 6 minutes. Then add wear-resistant support agent 2 and functional additives, heat to 125°C and mix for 10 minutes. After cooling to 80°C, add sulfur, accelerator CBS and other vulcanization system components, and continue mixing for 5 minutes. Collect the wear-resistant support layer compound. Then, take the compatibility layer material, maleic anhydride-grafted butadiene rubber, and place it in a two-roll mill. Add 1.2 kg of aminosilane KH-550 and 0.8 kg of epoxysilane KH-560 at 75°C and mix for 5 minutes to obtain the compatibility layer compound. The tire rubber composition is prepared by using a double-layer extrusion equipment, controlling the extrusion temperature at 105℃, and then pre-curing the extruded material at 145℃ for 11 minutes. The pre-cured material is then taken and subjected to final curing at 160℃ for 12 minutes.

[0043] Example 9 A rubber composition for tires includes a base rubber layer, a compatibility layer, and a wear-resistant support layer. The base rubber layer comprises the following substances: 65kg isoprene-butadiene copolymer rubber; 45kg wetland reinforcing agent 2kg; 2kg functional additives; The compatibility layer includes the following materials: 30 kg maleic anhydride-grafted butadiene rubber, 1.2 kg aminosilane and 0.8 kg epoxysilane; The wear-resistant support layer includes the following materials: 65kg of wear-resistant support layer rubber matrix, 42kg of wear-resistant support agent 2 and 2kg of functional additives; A method for preparing a rubber composition for tires includes the following steps: The base rubber layer material was placed in an internal mixer for internal mixing. The mixture was plasticized at an initial temperature of 55°C for 6 minutes. Then, wet reinforcing agent 2 and functional additives were added. The mixture was heated to 115°C and mixed for 10 minutes. After cooling to 80°C, sulfur, accelerator CBS and other functional additives were added. The mixture was then further mixed to obtain the base rubber layer compound. Next, take the wear-resistant support layer material and put it into an internal mixer for internal mixing. Plasticize at an initial temperature of 65°C for 6 minutes. Then add wear-resistant support agent 2 and functional additives, heat to 125°C and mix for 10 minutes. After cooling to 80°C, add sulfur, accelerator CBS and other vulcanization system components, and continue mixing for 5 minutes. Collect the wear-resistant support layer compound. Then, take the compatibility layer material, maleic anhydride-grafted butadiene rubber, and place it in a two-roll mill. Add 1.2 kg of aminosilane KH-550 and 0.8 kg of epoxysilane KH-560 at 75°C and mix for 5 minutes to obtain the compatibility layer compound. The tire rubber composition is prepared by using a double-layer extrusion equipment, controlling the extrusion temperature at 105℃, and then pre-curing the extruded material at 145℃ for 11 minutes. The pre-cured material is then taken and subjected to final curing at 160℃ for 12 minutes.

[0044] Example 10 A rubber composition for tires includes a base rubber layer, the base rubber layer comprising the following substances: 60kg isoprene-butadiene copolymer rubber; 40kg specific surface area 200-220m² 2 / g, silica granules with a native particle size of 15-20nm; 1kg of functional additives; A method for preparing a rubber composition for tires includes the following steps: Take the base rubber layer material and place it in an internal mixer for internal mixing. Plasticize at an initial temperature of 50℃ for 5 minutes, then add materials with a specific surface area of ​​200-220 m². 2 / g, silica particles with a native particle size of 15-20nm and functional additives are mixed at 110℃ for 8 minutes, then cooled to 75℃ and added to sulfur, accelerator CBS and other functional additives, and the mixture is further mixed to obtain the matrix rubber layer compound. The tire rubber composition is prepared by using an extrusion device, controlling the extrusion temperature at 100℃, and then pre-curing the extruded material at 140℃ for 8 minutes. The pre-cured material is then taken and subjected to final curing at 155℃ for 10 minutes.

[0045] Performance testing: Wet friction coefficient: tested according to standard ISO 8349; Tensile strength: Tested according to standard GB / T 528-2009; Akron wear volume: tested according to standard GB / T 1689-2014; The results are shown in Table 1 below: Table 1 Performance Test Table sample Wetland friction coefficient (0℃, 0.5mm water film) <![CDATA[Akron abrasion volume (cm 3 / 1.61 km)]]> Tensile strength (MPa) Example 1 0.7 0.18 28.5 Example 2 0.75 0.15 31.2 Example 3 0.73 0.16 30.1 Example 4 0.76 0.13 33.5 Example 5 0.8 0.11 36.2 Example 6 0.78 0.12 34.8 Example 7 0.82 0.1 37.5 Example 8 0.85 0.09 39.8 Example 9 0.83 0.1 38.6 Example 10 0.65 0.22 26.3 By comparing the test results of Examples 1-10 above with those in Table 1, it can be found that: By comparing Examples 1-3 and Example 10, this application's technical solution defines the modified layer structure and preparation method of the wetland reinforcing agent. Addressing the problems of poor compatibility and easy agglomeration of traditional silica with the rubber matrix, a core-shell structured composite reinforcing agent is constructed by coating the surface of silica particles with a modified layer. In the preparation process, a silane coupling agent is first used to achieve chemical bonding between silica and the rubber matrix, and then hydroxyethyl phosphonate is introduced to optimize surface properties. This dual modification approach solves the dispersion problem of silica and enhances its hydrophilicity and reinforcing effect. The presence of the modified layer allows the wetland reinforcing agent to not only leverage its structural advantages but also tightly bind to the rubber molecular chains through a dual mechanism of chemical action and physical entanglement, avoiding performance fluctuations caused by reinforcing agent agglomeration. This technical solution, through precise modification process design, achieves a synergistic improvement in the hydrophilicity, compatibility, and reinforcing properties of the wetland reinforcing agent, breaking through the limitations of traditional single silica modification and providing key technical support for the dual performance optimization of the matrix rubber layer.

[0046] By comparing Examples 1-3 and Examples 4-6, this application further illustrates that by adding a wear-resistant support layer, a two-layer structure combining the base rubber layer and the wear-resistant support layer is constructed. This solution breaks through the design limitations of traditional single-layer rubber compounds, rationally decomposing and synergizing functions: the base rubber layer focuses on wet grip performance, while the wear-resistant support layer focuses on enhancing overall wear resistance and structural support. The wear-resistant support agent uses porous, hierarchical carbon black / lignin composite particles. Its special porous structure can form an anchoring effect with the rubber molecular chains, significantly improving the wear resistance and mechanical strength of the rubber compound. At the same time, the properties of lignin endow it with a certain functional transfer capability, achieving performance synergy with the base rubber layer. The setting of the wear-resistant support layer not only solves the core problem of functional conflict in single-layer rubber compounds, but also improves the overall stability and service life of the tire through structural reinforcement, avoiding performance degradation caused by excessive surface wear.

[0047] Finally, by comparing Examples 4-6 and Examples 7-9, it is explained that the addition of a compatibility layer in this application solves the interlayer bonding problem in multilayer structures. In traditional multilayer rubber compositions, due to differences in composition and performance, different layers of rubber are prone to interlayer delamination and weak bonding, leading to overall performance degradation. This solution uses maleic anhydride-grafted polybutadiene rubber as the compatibility layer substrate. The active groups in its molecular structure can chemically react with the wet-wet reinforcing agent of the matrix rubber layer and the wear-resistant support agent of the wear-resistant support layer. At the same time, the combination of aminosilane and epoxysilane forms bridging bonds, further strengthening the interlayer chemical bonding. The compatibility layer not only achieves a tight bond between the two rubber layers but also promotes functional transfer, enabling the wet-wet properties of the matrix rubber layer and the wear-resistant properties of the wear-resistant support layer to form a synergistic effect, avoiding performance shortcomings caused by interlayer separation.

[0048] The present invention has been described in detail above with reference to specific embodiments and exemplary examples; however, these descriptions should not be construed as limiting the present invention. Those skilled in the art will understand that various equivalent substitutions, modifications, or improvements can be made to the technical solutions and embodiments of the present invention without departing from the spirit and scope of the invention, and all such modifications and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the appended claims.

[0049] All publications, patent applications, patents, and other references mentioned in this specification are incorporated herein by reference. Unless otherwise defined, all technical and scientific terms used in this specification have the meanings commonly understood by those skilled in the art. In case of conflict, the definitions in this specification shall prevail.

[0050] When this specification uses the prefixes “known to those skilled in the art,” “prior art,” or similar terms to derive materials, substances, methods, steps, apparatus, or components, the objects derived from such prefixes cover those commonly used in the art at the time of this application, but also include those that are not currently commonly used but will become generally recognized in the art as suitable for similar purposes.

[0051] In the context of this specification, except where expressly stated otherwise, any matters or issues not mentioned shall apply directly to those known in the art without any modification.

Claims

1. A rubber composition for tires, comprising a base rubber layer, characterized in that, The base rubber layer comprises the following components in parts by weight: 60-70 parts of abrasion-resistant rubber matrix; 40-50 parts of wetland reinforcing agent; Functional additives 1-3 parts; The wetland reinforcing agent has a specific surface area of ​​200-220 m². 2 / g, silica particles with a native particle size of 15-20nm.

2. The rubber composition for tires according to claim 1, characterized in that, The wetland reinforcing agent further includes a modified layer, which coats the surface of the silica particles. The wetland reinforcing agent is manufactured using the following technical solution: Silica is added to anhydrous ethanol, ultrasonically dispersed to form a suspension, heated and a silane coupling agent is added, the reaction is refluxed and then cooled, hydroxyethyl phosphonate is added, and the reaction is continued at the temperature; after filtration and vacuum drying, the wetland reinforcing agent can be prepared.

3. The rubber composition for tires according to claim 1, characterized in that, The wear-resistant rubber matrix is ​​isoprene-butadiene copolymer rubber.

4. The rubber composition for tires according to claim 1, characterized in that, The tire rubber composition further includes a wear-resistant support layer, which is disposed inside the base rubber layer and comprises the following components by weight: 50-80 parts of wear-resistant support layer rubber matrix; 35-50 parts of wear-resistant proppant; Functional additives 1-3 parts; The wear-resistant proppant is a porous hierarchical carbon black / lignin composite particle with a porosity of 35%-40% and a pore size distribution of 20-200nm.

5. A rubber composition for tires according to claim 4, characterized in that, The wear-resistant proppant is made using the following technical solution: Alkali lignin was added to propylene oxide and reacted at 100-110℃ and 0.2-0.5MPa for 1-3 hours to obtain modified lignin; carbon black and modified lignin were mixed, deionized water was added, and ultrasonic dispersion was performed to form a uniform slurry; Spray drying yields porous particles; the particles are added to a high-speed mixer, heated to 95°C, and MAH-g-PB and silane coupling agent are added. After stirring and mixing, and cooling, a wear-resistant proppant is obtained.

6. A rubber composition for tires according to claim 4, characterized in that, The wear-resistant support layer rubber matrix is ​​a mixture of styrene-butadiene rubber and natural rubber in a mass ratio of 1:2-3.

7. A rubber composition for tires according to claim 4, characterized in that, The tire rubber composition further includes a compatibility layer disposed between the base rubber layer and the wear-resistant support layer, the compatibility layer comprising the following components by weight: 15-30 parts of maleic anhydride-grafted polybutadiene rubber; 0.5-1.2 parts of aminosilane; 0.2-0.8 parts of epoxy silane.

8. A method for preparing a rubber composition for tires according to any one of claims 1-7, characterized in that, The preparation steps include the following: The materials in the base rubber layer, wear-resistant support layer and compatibility layer are placed in an internal mixer and mixed separately to obtain the base rubber layer compound, wear-resistant support layer compound and compatibility layer compound. A three-layer co-extrusion equipment is used, and the extrusion temperature is controlled at 100-110℃. After extrusion molding, the material is pre-vulcanized at 140-150℃ for 8-15 minutes. The tire rubber composition can be prepared by taking the pre-vulcanized material and subjecting it to final vulcanization treatment at 155-165℃ for 10-15 minutes.