Air spring buffer block rubber material and preparation method thereof

Abstract

The invention relates to an air spring buffer block sizing material and a preparation method thereof, and relates to the technical field of rubber, and the air spring buffer block sizing material comprises natural rubber, emulsion polymerized styrene-butadiene rubber, reclaimed rubber, waste rubber cord fabric, zinc oxide, stearic acid, an anti-aging agent, microcrystalline wax, tall oil modified phenol formaldehyde resin, a rubber homogenizing agent HA, light calcium carbonate, carbon black, environment-friendly aromatic oil, an accelerant and sulfur. As a low-cost elastic matrix, the reclaimed rubber and a rubber phase capable of participating in co-vulcanization in the waste rubber cord fabric form matrix-bridging complementation through chemical bonding, so that the stress is effectively dispersed; meanwhile, short fibers generated in the waste rubber cord fabric are in interface bonding with a rubber matrix under the interface modification effect of the tall oil resin, and the defect that the rigidity of a high filling system is insufficient is overcome. And the rubber homogenizing agent ensures that all the components are uniformly dispersed. Finally, due to the synergistic effect of multiple components and multiple mechanisms, the rubber material obtains excellent rigidity-elasticity balance, compressive deformation resistance and reliable fatigue durability.

Description

Technical Field

[0001] This application relates to the field of rubber technology, specifically to an air spring buffer block rubber compound and its preparation method. Background Technology

[0002] Air spring dampers are crucial safety components in automotive suspension systems. Their primary function is to provide rigid cushioning at the limits of the air spring's travel, preventing direct metal-to-metal collisions, protecting the airbag, and improving ride comfort. Due to the need to withstand significant instantaneous impact loads, traditional air spring dampers typically require high-hardness rubber materials, generally between 75 and 90 Shore A. However, excessive hardness often leads to a decrease in the rubber material's elasticity and toughness, causing localized brittle fracture—a phenomenon known as "rubber chipping"—when the product is subjected to impact during actual use, thus affecting its protective function and lifespan.

[0003] Currently, to achieve the required high hardness, air spring buffer block compounds on the market generally adopt a technical approach that uses natural rubber and synthetic rubber as the main components, with a large amount of reinforcing materials such as carbon black. This type of formulation improves hardness and modulus by increasing crosslinking density and filler content, but inevitably sacrifices the flexibility and tear resistance of the compound. At the same time, to ensure performance, the proportion of raw rubber (i.e., unused new rubber) in the compound is relatively high, resulting in high raw material costs.

[0004] Therefore, it is of great significance to develop a buffer block material that is economically efficient, has suitable stiffness, good resilience, and excellent resistance to compressive deformation. Summary of the Invention

[0005] This application provides an air spring buffer block rubber compound and its preparation method, which has the characteristics of good economic benefits, suitable stiffness, good resilience, and excellent resistance to compression deformation.

[0006] Firstly, the air spring buffer block rubber material provided in this application adopts the following technical solution: An air spring buffer block compound, comprising the following components by weight percentage: natural rubber 10-20%, latex styrene-butadiene rubber 8-13%, reclaimed rubber 18-23%, waste rubber cord fabric 18-33%, zinc oxide 0.8-1.2%, stearic acid 0.25-0.5%, antioxidant RD 0.25-0.5%, microcrystalline wax 0.15-0.35%, tall oil modified phenol-formaldehyde resin 1.1-1.6%, rubber homogenizer HA 0.5-1.0%, light calcium carbonate 3.0-4.5%, N660 carbon black 14-18%, environmentally friendly aromatic oil 1.1-1.6%, accelerator H-80 0.15-0.35%, accelerator CBS 0.3-0.5%, and sulfur 0.5-0.8%; The waste rubber curtain fabric is composed of unvulcanized curtain rubber and curtain cord.

[0007] By adopting the above technical solution, the raw rubber matrix of this solution is composed of natural rubber and emulsion styrene-butadiene rubber. Natural rubber mainly contributes high elasticity, excellent fatigue resistance, and high strength, which is the basis for the buffer block to achieve repeated compression and rebound function. The introduction of emulsion styrene-butadiene rubber improves the heat aging resistance and abrasion resistance of the rubber compound, and forms a good complement to natural rubber in vulcanization kinetics, ensuring the uniformity of the vulcanization network. The introduced reclaimed rubber, as a plastic material that has undergone desulfurization and degradation, mainly plays the role of significantly reducing the cost of the rubber compound and the energy consumption of mixing. At the same time, some of the cross-linked network fragments contained therein can act as inert filler points in the final rubber compound, which helps to suppress excessive elastic deformation.

[0008] Uncured waste rubber tire cord is a multifunctional composite component, consisting of uncured tire cord rubber and organic tire cord. The uncured rubber portion, thanks to the active double bonds and residual compounding agents retained in its molecular chains, can undergo a co-crosslinking reaction with the new raw rubber matrix during the vulcanization process, transforming from physical filling to chemical bonding, effectively improving interfacial bonding strength. Meanwhile, the dispersed tire cord is cut into short fibers under the shearing action of mixing, forming a short-fiber reinforced rubber composite material, improving the rubber compound's tensile stress, tear resistance, and creep resistance.

[0009] Based on this, in order to reduce the interfacial tension between the components and promote the compatibility and uniform dispersion of reclaimed rubber, raw rubber, and waste rubber cord fabric, a rubber homogenizer is introduced to achieve uniform and stable performance and avoid the formation of weak interfaces.

[0010] Tall oil-modified phenol-formaldehyde resin serves two purposes: firstly, as a processing aid, it improves the viscosity of the rubber compound, facilitating its molding; secondly, as a tackifying resin, it effectively wets and coats the surface of the hydrophilic cord, creating a flexible interfacial transition layer between the fiber and the hydrophobic rubber matrix. This improves the efficiency of stress transfer from the rubber matrix to the high-strength fiber, allowing the short fiber reinforcement effect to be fully realized.

[0011] A vulcanization system employing both CBS and H-80 accelerators is used. CBS acts as the primary accelerator, providing a stable vulcanization induction period to ensure processing safety; H-80, as a secondary aldehyde-amine accelerator, provides high vulcanization activity. This combination ensures that even with a large amount of recycled materials, the rubber compound can still achieve full and rapid crosslinking, forming a complete network structure.

[0012] With each of the aforementioned components fulfilling its functional role, the reclaimed rubber, uncured waste rubber cord fabric, and homogenizer / tackifying resin constitute a synergistically reinforcing system. Firstly, a matrix-bridging complementarity is formed between the reclaimed rubber and the uncured cord fabric rubber. The reclaimed rubber acts as a fluid, low-cost continuous matrix phase, but its strength is insufficient. Meanwhile, the uncured cord fabric rubber particles, through co-curing with the virgin rubber matrix, generate strong chemical bridging points at the interface between the old and new rubber phases. This chemical bonding transforms areas that might otherwise become defective interfaces into effective stress transfer nodes, thus combining the incremental effect of the reclaimed rubber with the reinforcing effect of the cord fabric rubber, partially restoring the mechanical properties lost due to the use of recycled materials.

[0013] Secondly, through interface engineering with tall oil resin, strong synergy is achieved between the short fibers in the waste rubber cord fabric and the entire rubber matrix. The dispersed short fibers act like microskeletons implanted in the rubber matrix. When the material is under stress, the fibers bear and transfer the load through interfacial shear, improving the material's stiffness and resistance to deformation, and compensating for the modulus decrease caused by the large amount of reclaimed rubber and inert fillers. Meanwhile, N660 carbon black, as a traditional reinforcing filler, further fills the microscopic space inside the rubber phase, complementing the macroscopic reinforcement of the short fibers and achieving multi-scale reinforcement.

[0014] Ultimately, the rubber homogenizer HA ensures that the aforementioned synergistic effects can be achieved on a uniform and stable physical basis. Without it, high-proportion heterogeneous material blends are prone to phase separation, and the chemical bridging and physical reinforcement effects will be significantly reduced due to interfacial inhomogeneity.

[0015] Optionally, the reclaimed rubber is tire reclaimed rubber with a Mooney viscosity of 55-65.

[0016] By adopting the above technical solution, the reclaimed tire rubber, derived from waste tire rubber with relatively stable composition and performance, has a better compatibility with the raw rubber system in this formulation, which is conducive to achieving more uniform blending at the microscopic level. Furthermore, the reclaimed rubber within this viscosity range avoids both the excessive loss of physical strength and the problem of sticking to the rolling mill caused by excessively low viscosity, and the problems of difficult dispersion and high processing energy consumption caused by excessively high viscosity.

[0017] Optionally, the rubber homogenizer HA is a petroleum resin-based composite homogenizer.

[0018] By adopting the above technical solution, petroleum resin itself has good compatibility and thickening properties. Based on it, the composite homogenizer can more effectively reduce the interfacial tension between multiphase components such as natural rubber, styrene-butadiene rubber, reclaimed rubber and waste rubber cord fabric, and promote the formation of a uniform and stable blend system.

[0019] Optionally, the mass ratio of accelerator H-80 to accelerator CBS is 1:1.5-2.5.

[0020] By adopting the above technical solution, CBS, as the main accelerator, is used in a dominant amount, ensuring sufficient scorch time and providing reliable processing safety for the compounding and molding of rubber containing a large amount of complex recycled components, thus preventing scorch. At the same time, the highly active accelerator H-80, used in controlled amounts as a co-activating component, effectively improves the vulcanization reaction rate and crosslinking density.

[0021] Optionally, the waste adhesive fabric consists of fabric adhesive and fabric cord in a mass ratio of 0.6-0.65:0.35-0.4.

[0022] By adopting the above technical solution and through the synergistic effect of the mass ratio of the two, the chemical reinforcement of the fabric adhesive and the physical reinforcement of the cord are organically combined. This allows the composite waste material to reduce costs without weakening the material performance. Instead, it contributes rigid support and stability, thereby ensuring the durability of the buffer block under long-term repeated compression conditions.

[0023] Optionally, the zinc oxide is zinc oxide obtained by an indirect method.

[0024] By adopting the above technical solution, indirect zinc oxide has higher chemical purity and more stable physical properties due to its preparation process. This high purity and uniformity ensure that the core function of zinc oxide as a sulfidation activator can be performed efficiently and stably, and react fully with stearic acid to form a uniformly dispersed zinc soap, thereby effectively activating the activity of accelerators CBS and H-80.

[0025] Optionally, the softening point of the tall oil-modified phenol-formaldehyde resin is 85-105℃.

[0026] By adopting the above technical solution, during the mixing stage, the softening point ensures that the resin fully melts and flows, thereby uniformly coating the surface of the cord threads in the waste rubber cord fabric. This effectively improves the interfacial wetting and adhesion between the hydrophilic fibers and the hydrophobic rubber matrix, and is a key pretreatment to achieve the short fiber reinforcement effect. During subsequent vulcanization and at the product's operating temperature, the resin solidifies to form a tough interfacial layer, acting as a stable bridge for stress transfer, strengthening the overall bond between the waste rubber cord fabric and the rubber matrix, and improving the creep resistance and durability of the buffer block.

[0027] Secondly, this application provides a method for preparing an air spring buffer block rubber compound, comprising the following steps: S1. Masterbatch and Final Mixing: Natural rubber, latex styrene-butadiene rubber, reclaimed rubber, zinc oxide, stearic acid, antioxidant RD, microcrystalline wax, tall oil-modified phenol-formaldehyde resin, rubber homogenizer HA, light calcium carbonate, N660 carbon black, and environmentally friendly aromatic oil are mixed in a Banbury mixer for the first stage of mixing, with a discharge temperature of 160±2℃ to obtain masterbatch; After the masterbatch is left to stand at room temperature for 24-48 hours, it is then mixed with accelerator H-80, accelerator CBS, and sulfur in a Banbury mixer for the second stage of mixing, with a discharge temperature of 110±2℃ to obtain final vulcanized rubber; S2. Fabric pretreatment: Cut the waste plastic curtain fabric into small pieces weighing 100-300g; S3. Blending and preforming: The final vulcanized rubber obtained in step S1 and the waste rubber cord fabric obtained in step S2 are fed into an open mill at a mass ratio of 82-67:18-33 and blended for 5-8 minutes until uniform, and then the rubber preform is made. S4. Extrusion and cooling: The rubber preform obtained in step S3 is fed into an extruder and extruded into a cylindrical strip with a diameter of 10-15cm. It is then left at room temperature for 24-48 hours to allow it to cool completely. S5. Quantitative cutting: Cut the strip material cooled in step S4 into block-shaped rubber materials, the weight of which is 105% of the product design weight; S6. Vulcanization molding: Place the block rubber material obtained in step S5 into a preheated vulcanization mold and vulcanize it at a temperature of 160±2℃ for 20-24 minutes. After demolding, trim the edges to obtain an air spring buffer block rubber material.

[0028] By adopting the above technical solution, the vulcanization system (accelerator and sulfur) is added in the second stage of final mixing in the S1 stage, and the discharge temperature is strictly controlled to ensure that the filler, oil and other components are fully dispersed and impregnated in the masterbatch at a high temperature of 160℃. On the other hand, it effectively avoids the premature consumption or scorching of the accelerator at high temperature, thus preserving a complete vulcanization system with consistent reactivity for subsequent processes. In the S3 step, pre-cut waste rubber cord blocks are placed in an open mill for low-temperature blending with the vulcanized rubber that has completed final mixing. This operation allows the unvulcanized rubber in the cord block to achieve physical entanglement and preliminary interface fusion with the matrix rubber under mechanical shear force, while avoiding the potential damage to the strength of the cord fibers and the stability of the vulcanization system caused by high-temperature internal mixing. The long-term room temperature rest after extrusion of the rubber blank in the subsequent S4 step provides sufficient stress relaxation and shape fixation time for the rubber compound, which directly ensures the uniformity of flow and dimensional stability of the rubber compound in the mold cavity during S6 vulcanization molding, thereby finally obtaining a buffer block product with a dense structure and consistent performance.

[0029] In summary, this application includes at least one of the following beneficial technical effects: 1. Reclaimed rubber, as a low-cost elastic matrix, forms a matrix-bridging complementary structure with the rubber phase in waste rubber cord fabric that can participate in co-vulcanization through chemical bonding. This effectively disperses stress and partially restores the mechanical properties lost due to the large amount of recycled material used as filler. Simultaneously, the short fibers generated from the waste rubber cord fabric, under the interfacial modification effect of tall oil resin, achieve interfacial bonding with the rubber matrix, forming a short fiber reinforced composite structure. This improves the elongation stress, creep resistance, and tear resistance of the rubber compound, compensating for the insufficient stiffness of the high-filler system. Meanwhile, the rubber homogenizer ensures the uniform dispersion of components with different polarities and viscosities, providing a stable and uniform basis for the synergistic effect of chemical and physical processes. Ultimately, this multi-component, multi-mechanism synergistic effect enables the rubber compound to achieve excellent stiffness-elasticity balance, resistance to compressive deformation, and reliable fatigue durability while reducing raw material costs. Detailed Implementation

[0030] The present application will be further described in detail below with reference to the embodiments.

[0031] The natural rubber is 20# standard rubber from Xishuangbanna Sinochem Rubber Co., Ltd.; The emulsion styrene-butadiene rubber is SBR1502 from Sinopec Qilu Branch; The reclaimed rubber is RR40 from Sichuan Longchang Haiyan Rubber Co., Ltd. Zinc oxide was purchased from Yangzhou Huali Zinc Industry Co., Ltd. Stearic acid is SA-1810 from Wilmar Oils & Fats Technology (Dongguan) Co., Ltd. Anti-aging agent purchased from Comec Chemical Co., Ltd.; The microcrystalline wax is 220F from Hansheng Chemical (Fushun) Co., Ltd.; The tall oil-modified phenol-formaldehyde resin is SL-2101 from Huachi (China) Chemical Co., Ltd. The rubber homogenizer HA was purchased from Guangzhou Laili Industrial Co., Ltd. Light calcium carbonate was purchased from Hubei Guoxing Calcium Magnesium Chemical Co., Ltd. The carbon black was purchased from Jiangxi Black Cat Company; The environmentally friendly aromatic oil was purchased from Jiangsu Qixiang High-Tech Materials Co., Ltd. Accelerator H-80 was purchased from Kunshan Yateman Chemical Co., Ltd. The accelerator CBS was purchased from Comec Chemical Co., Ltd. The sulfur was purchased from Wuxi Huasheng Rubber New Material Technology Co., Ltd.

[0032] Example 1 An air spring buffer block compound is composed of the following components by weight percentage: natural rubber 14.35%, latex styrene-butadiene rubber 11.23%, reclaimed rubber 20.74%, waste rubber cord fabric 26.58%, zinc oxide 0.92%, stearic acid 0.48%, antioxidant RD 0.48%, microcrystalline wax 0.16%, tall oil modified phenol-formaldehyde resin 1.18%, rubber homogenizer HA 0.87%, light calcium carbonate 3.94%, N660 carbon black 16.53%, environmentally friendly aromatic oil 1.18%, accelerator H-80 0.31%, accelerator CBS 0.31%, and sulfur 0.74%. Among them, the reclaimed rubber is tire reclaimed rubber with a Mooney viscosity of 55-65; the rubber homogenizer HA is a petroleum resin-based composite homogenizer; the mass ratio of accelerator H-80 to accelerator CBS is 1:2; the waste rubber cord consists of 0.6% by mass of unvulcanized cord rubber and 0.4% by mass of cord thread; the softening point of tall oil modified phenol-formaldehyde resin is 85-105℃.

[0033] A method for preparing an air spring buffer block rubber compound includes the following steps: S1. Masterbatch and Final Mixing: Natural rubber, latex styrene-butadiene rubber, reclaimed rubber, zinc oxide, stearic acid, antioxidant RD, microcrystalline wax, tall oil-modified phenol-formaldehyde resin, rubber homogenizer HA, light calcium carbonate, N660 carbon black, and environmentally friendly aromatic oil are mixed in a Banbury mixer for the first stage of mixing, with a discharge temperature of 160℃, to obtain masterbatch; After the masterbatch is left to stand at room temperature for 24 hours, it is then mixed with accelerator H-80, accelerator CBS, and sulfur in a Banbury mixer for the second stage of mixing, with a discharge temperature of 110℃, to obtain final vulcanized rubber. S2. Fabric pretreatment: Cut the waste plastic curtain fabric into small pieces weighing 200g each; S3. Blending and preforming: The final vulcanized rubber obtained in step S1 and the waste rubber cord fabric obtained in step S2 are fed into an open mill at a mass ratio of 67:33 and blended for 6 minutes until uniform, and then the rubber preform is made. S4. Extrusion and cooling: The rubber preform obtained in step S3 is fed into an extruder and extruded into a cylindrical strip with a diameter of 13cm. It is then left at room temperature for 24 hours to allow it to cool completely. S5. Quantitative cutting: Cut the strip material cooled in step S4 into block-shaped rubber materials, the weight of which is 105% of the product design weight; S6. Vulcanization molding: Place the block rubber material obtained in step S5 into a preheated vulcanization mold and vulcanize at 160°C for 20 minutes. After demolding and trimming, an air spring buffer block rubber material is obtained.

[0034] Example 2 An air spring buffer block compound differs from Example 1 in that it is composed of the following components by weight percentage: 15.35% natural rubber, 10.23% latex styrene-butadiene rubber, 21.74% reclaimed rubber, 25.58% waste rubber cord fabric, 1.02% zinc oxide, 0.38% stearic acid, 0.38% antioxidant RD, 0.26% microcrystalline wax, 1.28% tall oil modified phenol-formaldehyde resin, 0.77% rubber homogenizer HA, 3.84% light calcium carbonate, 16.63% N660 carbon black, 1.28% environmentally friendly aromatic oil, 0.21% accelerator H-80, 0.41% accelerator CBS, and 0.64% sulfur.

[0035] Example 3 An air spring buffer block compound differs from Example 1 in that it is composed of the following components by weight percentage: 16.35% natural rubber, 9.23% latex styrene-butadiene rubber, 22.74% reclaimed rubber, 24.58% waste rubber cord fabric, 1.12% zinc oxide, 0.28% stearic acid, 0.48% antioxidant RD, 0.16% microcrystalline wax, 1.28% tall oil modified phenol-formaldehyde resin, 0.77% rubber homogenizer HA, 3.84% light calcium carbonate, 16.63% N660 carbon black, 1.28% environmentally friendly aromatic oil, 0.21% accelerator H-80, 0.46% accelerator CBS, and 0.59% sulfur.

[0036] Comparative Example 1 An air spring buffer block rubber compound differs from Example 1 in that the waste rubber fabric is replaced with an equal amount of recycled rubber.

[0037] Comparative Example 2 An air spring buffer block rubber compound differs from Example 1 in that the recycled rubber is replaced with an equal amount of waste rubber fabric.

[0038] Comparative Example 3 An air spring buffer block rubber compound differs from Example 1 in that the rubber homogenizer HA is replaced with a conventional homogenizer.

[0039] Comparative Example 4 An air spring buffer block rubber compound differs from Example 1 in that the waste rubber fabric is replaced with an equal amount of ordinary vulcanized rubber powder.

[0040] Comparative Example 5 An air spring buffer block compound differs from Example 1 in that the amount of rubber homogenizer HA is increased from 0.8% to 0.2%, and the amount of natural rubber is increased by 0.6%, while the remaining components and their amounts remain unchanged.

[0041] Comparative Example 6 An air spring buffer block rubber compound differs from Example 1 in that the unvulcanized waste rubber fabric is replaced with an equal amount of vulcanized waste rubber fabric.

[0042] Detection example The Shore hardness of the air spring buffer block rubber compound was tested according to GB / T 531.1-2008 "Test method for indentation hardness of vulcanized rubber or thermoplastic rubber - Part 1: Shore hardness tester method (Shore hardness)". The tensile strength and elongation at break of the air spring buffer block rubber compound were tested in accordance with GB / T 528-2009 "Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber". The compression set of the air spring buffer block rubber compound was tested according to GB / T 7759.1-2015 "Determination of compression set of vulcanized rubber or thermoplastic rubber - Part 1: Under normal and high temperature conditions". Compressed air spring buffer block rubber material 16.8mm, 1Hz, fatigue life tested for 300,000 cycles; The specific test results are shown in Table 1.

[0043] Table 1

[0044] As shown in Table 1 of the performance test data for Examples 1-3 and Comparative Examples 1-2, Comparative Example 1 (using only reclaimed rubber) exhibits low strength and large deformation, with high compression set, failing to meet the requirements for support and creep resistance. The Comparative Example (using only waste rubber cord fabric) exhibits poor processability, excessively low elongation, and short fatigue life due to poor compatibility. Example 1 combines both, where the flexibility and processability of the reclaimed rubber compensate for the rigidity and brittleness of the high fiber content, while the reinforcing effect of the short fibers in the waste rubber cord fabric and the co-vulcanization effect of the unvulcanized rubber enhance the stiffness and strength of the reclaimed rubber matrix. This synergistic effect allows Example 1 to achieve a balance between the two, resulting in optimal overall performance, particularly with a compression set far superior to Comparative Example 1, while maintaining good processability.

[0045] As shown in Table 1 of the performance test data for Examples 1-3 and Comparative Examples 3 and 5, the physical and mechanical properties of Comparative Example 3 decreased across the board after the homogenizer was removed, and the data fluctuated greatly. This directly proves that without the homogenizer HA to ensure the microscopic uniform dispersion of the multiphase components, the ideal synergistic effect between reclaimed rubber and waste rubber cord fabric cannot be achieved, and the performance is even lower than that of a single recycled material system.

[0046] As shown in Table 1 of the performance test data of Examples 1-3 and Comparative Examples 4 and 6, the performance of Comparative Example 4 after replacing the waste rubber cord with ordinary vulcanized rubber powder is inferior to that of Example 1. This proves that the co-vulcanization of unvulcanized cord rubber has a stronger interfacial bond than inert vulcanized rubber powder. The short fiber reinforcement effect provided by the cord is the key to improving the rigidity, tear resistance and creep resistance of the rubber compound, which cannot be provided by ordinary rubber powder filler.

[0047] Please note that the technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments have been described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification. The above embodiments only illustrate several implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A rubber compound for an air spring buffer block, characterized in that, It is composed of the following components by weight percentage: natural rubber 10-20%, emulsion styrene-butadiene rubber 8-13%, reclaimed rubber 18-23%, waste rubber cord fabric 18-33%, zinc oxide 0.8-1.2%, stearic acid 0.25-0.5%, antioxidant RD 0.25-0.5%, microcrystalline wax 0.15-0.35%, tall oil modified phenol-formaldehyde resin 1.1-1.6%, rubber homogenizer HA 0.5-1.0%, light calcium carbonate 3.0-4.5%, N660 carbon black 14-18%, environmentally friendly aromatic oil 1.1-1.6%, accelerator H-80 0.15-0.35%, accelerator CBS 0.3-0.5%, sulfur 0.5-0.8%; The waste rubber curtain fabric is composed of unvulcanized curtain rubber and curtain cord.

2. The air spring buffer block rubber material according to claim 1, characterized in that, The reclaimed rubber is tire reclaimed rubber with a Mooney viscosity of 55-65.

3. The air spring buffer block rubber material according to claim 1, characterized in that, The rubber homogenizer HA is a petroleum resin-based composite homogenizer.

4. The air spring buffer block rubber material according to claim 1, characterized in that, The mass ratio of accelerator H-80 to accelerator CBS is 1:1.5-2.

5.

5. The air spring buffer block rubber material according to claim 1, characterized in that, The waste rubber curtain fabric is composed of curtain adhesive and curtain thread in a mass ratio of 0.6-0.65:0.35-0.

4.

6. The air spring buffer block rubber material according to claim 1, characterized in that, The zinc oxide is obtained by an indirect method.

7. The air spring buffer block rubber material according to claim 1, characterized in that, The softening point of the tall oil-modified phenol-formaldehyde resin is 85-105℃.

8. A method for preparing an air spring buffer block rubber compound according to any one of claims 1-7, characterized in that, Includes the following steps: S1. Masterbatch and Final Mixing: Natural rubber, latex styrene-butadiene rubber, reclaimed rubber, zinc oxide, stearic acid, antioxidant RD, microcrystalline wax, tall oil-modified phenol-formaldehyde resin, rubber homogenizer HA, light calcium carbonate, N660 carbon black, and environmentally friendly aromatic oil are mixed in a Banbury mixer for the first stage of mixing, with a discharge temperature of 160±2℃ to obtain masterbatch; After the masterbatch is left to stand at room temperature for 24-48 hours, it is then mixed with accelerator H-80, accelerator CBS, and sulfur in a Banbury mixer for the second stage of mixing, with a discharge temperature of 110±2℃ to obtain final vulcanized rubber; S2. Fabric pretreatment: Cut the waste plastic curtain fabric into small pieces weighing 100-300g; S3. Blending and preforming: The final vulcanized rubber obtained in step S1 and the waste rubber cord fabric obtained in step S2 are fed into an open mill at a mass ratio of 82-67:18-33 and blended for 5-8 minutes until uniform, and then the rubber preform is made. S4. Extrusion and cooling: The rubber preform obtained in step S3 is fed into an extruder and extruded into a cylindrical strip with a diameter of 10-15cm. It is then left at room temperature for 24-48 hours to allow it to cool completely. S5. Quantitative cutting: Cut the strip material cooled in step S4 into block-shaped rubber materials, the weight of which is 105% of the product design weight; S6. Vulcanization molding: Place the block rubber material obtained in step S5 into a preheated vulcanization mold and vulcanize it at a temperature of 160±2℃ for 20-24 minutes. After demolding, trim the edges to obtain an air spring buffer block rubber material.

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