Wear-resistant high-elasticity rubber as well as preparation method and application thereof

Abstract

The invention discloses wear-resistant high-elasticity rubber as well as a preparation method and application thereof, and relates to the technical field of rubber products. The wear-resistant high-elasticity rubber comprises a composite rubber matrix, EVA (Ethylene Vinyl Acetate) resin, a compatilizer, a wear-resistant filler and other auxiliaries. Wherein the composite rubber matrix comprises butadiene rubber, natural rubber and epoxidized natural rubber, and through the technical scheme of the application, the rubber with excellent wear resistance and high resilience can be prepared; the rubber also has higher static friction coefficient and sliding friction coefficient on a wet and slippery plane, is not easy to slip on a wet and slippery road surface, and is suitable for being used as a rubber outsole raw material for preparing soles; meanwhile, the tensile strength and the heat aging resistance of the rubber are good, so that the shoe sole made of the rubber can keep excellent comprehensive performance for a long time and is not easy to damage.

Description

Technical Field

[0001] This invention relates to the technical field of rubber products, and in particular to a wear-resistant high-elastic rubber, its preparation method, and its application. Background Technology

[0002] Since the 1980s, the footwear industry has developed rapidly, continuously driving the upgrading of rubber outsole performance. As rubber outsoles are crucial in athletic shoes, their performance directly affects the quality and user experience. Therefore, with the continuous expansion of the athletic shoe market and the increasing demands of consumers for athletic shoe performance, the improvement and development of rubber outsole material systems has naturally become an inevitable trend in recent years.

[0003] In the development of rubber outsole material systems, different technologies have been adopted to meet the needs of different stages. The first-generation system, primarily based on emulsion styrene-butadiene rubber (SBR), utilized its balanced overall performance to meet the road surface requirements at the time. The subsequent second-generation system, based on butadiene rubber (BR), significantly improved the abrasion resistance of the sole due to its superior wear resistance. Further improvements in tear strength could be achieved by blending with natural rubber. Simultaneously, to meet the demand for colored outsoles, reinforcing agents gradually shifted from traditional carbon black to silica, especially silica modified with special coupling agents. This silica achieved reinforcing effects comparable to traditional carbon black while also adding a degree of slip resistance to the sole.

[0004] However, because the high abrasion resistance of butadiene rubber stems partly from its low coefficient of friction, it also results in poor wet slip resistance in shoe soles, making them prone to slipping and posing certain safety hazards. Furthermore, as the soles age due to ultraviolet radiation, their hardness increases, further deteriorating their slip resistance and significantly reducing their elasticity and abrasion resistance, impacting wear and tear. Therefore, developing a rubber that can maintain high abrasion resistance, high elasticity, and good wet slip resistance over a long period is crucial for the future development of the footwear industry. Summary of the Invention

[0005] To ensure that the rubber used in shoe soles has excellent wear resistance and high elasticity, as well as good anti-slip properties and aging resistance, this application provides a wear-resistant high-elastic rubber, its preparation method, and its application.

[0006] Firstly, the wear-resistant high-elasticity rubber provided in this application adopts the following technical solution: A wear-resistant, high-elasticity rubber comprises the following raw materials in parts by weight: Composite rubber matrix: 100 parts; EVA resin: 5-10 parts; Compatibilizer: 2.5-5 parts; Wear-resistant filler: 30-36 parts; Silane coupling agent: 3.5-5 parts; Sulfur: 0.2-0.6 parts; Dicumyl peroxide: 1-1.4 parts; Vulcanization accelerator: 2.6-4.2 parts; Vulcanizing aid: 7-10 parts; Anti-aging agent: 2.5-3 parts; The composite rubber matrix includes butadiene rubber, natural rubber and epoxidized natural rubber, and the mass ratio of butadiene rubber, natural rubber and epoxidized natural rubber is (50-65):(25-40):(5-10).

[0007] By adopting the above technical solution, a rubber with excellent wear resistance and high resilience can be obtained. Moreover, the rubber also has a high static friction coefficient and sliding friction coefficient when facing a wet and slippery surface, making it less prone to slipping on wet and slippery roads. It is suitable as a raw material for rubber outsoles to prepare shoe soles. At the same time, the rubber has good tensile strength and heat aging resistance, which helps to ensure that the shoe soles made from this rubber can maintain good comprehensive performance for a long time and are not easily damaged.

[0008] Optionally, the EVA resin is further subjected to sulfonation treatment before being added and mixed, and the vulcanization aid is specifically a composition of stearic acid, zinc oxide and magnesium oxide.

[0009] Optionally, the sulfonation treatment of the EVA resin includes the following steps: First, the EVA resin is thoroughly dried, then heated to 150-160℃ for open milling. After the EVA resin has fully coated the rollers, sulfonating agent and antioxidant are added, and the open milling continues for 8-12 minutes. After the open milling is completed, the rubber material is discharged and allowed to cool to room temperature before being fully pulverized to obtain the sulfonated EVA resin.

[0010] Optionally, the mass ratio of stearic acid, zinc oxide and magnesium oxide is 1:3:(1-2).

[0011] By adopting the above technical solution, after sulfonation treatment, an appropriate amount of double bonds can be introduced into the EVA resin, promoting further reaction between the EVA resin and the composite rubber matrix, thereby further improving the overall performance of the rubber. Magnesium oxide and zinc oxide can act as acid acceptors, combining with the acidic products released from the sulfonic acid groups during vulcanization and maintaining the system in a central or slightly alkaline environment, which is beneficial for ensuring the normal progress of the vulcanization reaction.

[0012] Optionally, the compatibilizer is either maleic anhydride-grafted EVA or maleic anhydride-grafted SEBS.

[0013] By adopting the above technical solutions, the compatibility between the composite rubber matrix and EVA resin or other polar raw materials can be effectively improved. In addition, when maleic anhydride-grafted SEBS is used as the compatibilizer, the maleic anhydride-grafted SEBS can improve compatibility, and the introduced SEBE long chain segments can also achieve entanglement synergy, which is conducive to improving the overall mechanical properties of the rubber.

[0014] Optionally, the wear-resistant filler is a composition of fumed silica and aramid pulp, wherein the mass ratio of fumed silica to aramid pulp is (25-35):(1-6).

[0015] Optionally, the fiber length in the fiber pulp is 0.6-1 mm.

[0016] By adopting the above technical solutions, the wear resistance, tensile strength and heat aging resistance of rubber can be effectively improved. At the same time, the coefficient of friction of rubber on wet and slippery surfaces can be significantly improved, which helps to make rubber less prone to slipping on wet and slippery surfaces.

[0017] Optionally, the vulcanization accelerator is a combination of accelerator CZ and accelerator DTDC, and the mass ratio of accelerator CZ to accelerator DTDC is (2-3):(0.6-1.2).

[0018] By adopting the above technical solution, the vulcanization efficiency of the vulcanization system formed by sulfur-peroxide compound can be effectively improved, and it is beneficial to improve the mechanical properties and heat aging resistance of rubber.

[0019] Optionally, the antioxidant is a composition of antioxidant 4020, antioxidant RD and antioxidant MB, and the mass ratio of antioxidant 4020, antioxidant RD and antioxidant MB is 1.5:(0.8-1):(0.2-0.5).

[0020] By adopting the above technical solution, antioxidants 4020, RD and MB can produce a certain synergistic effect, which not only helps to further improve the aging properties of vulcanizates such as heat, oxygen, ozone and flexural aging, but also helps to prevent the fatigue degradation of rubber and provide better anti-aging protection.

[0021] Secondly, the method for preparing a wear-resistant high-elasticity rubber provided in this application adopts the following technical solution: A method for preparing abrasion-resistant high-elasticity rubber includes the following steps: S1. The composite rubber matrix is ​​mixed. After the composite rubber matrix is ​​fully wrapped around the roller, the EVA resin and the compatibilizer are added and mixed evenly. The vulcanizing agent and the antioxidant are added and mixed evenly. The wear-resistant filler is added and the silane coupling agent is slowly added during the mixing process and mixed evenly. During the mixing process, the temperature should be controlled not to exceed 120°C. After the mixing is completed, the rubber compound is discharged and cooled to obtain the first-stage rubber compound. S2. The sulfur, dicumyl peroxide and vulcanization accelerator are thoroughly mixed in advance to obtain a vulcanization mixture. The first-stage rubber compound is then mixed, and then an equal amount of the vulcanization mixture is added in multiple batches and mixed evenly. During the mixing process, the temperature should be controlled not to exceed 80°C. After the mixing is completed, the rubber compound is discharged and cooled to obtain the wear-resistant high-elasticity rubber.

[0022] By adopting the above technical solution and using a batch-by-batch, sequential mixing method, it is beneficial to ensure that the composite rubber matrix and various additives are fully mixed. Secondly, mixing the vulcanization system at a low temperature can inhibit the vulcanization reaction during the mixing process, which helps to extend the storage time of the rubber. In addition, the preparation method is simple and convenient, which is conducive to subsequent mass production.

[0023] Thirdly, the application of the wear-resistant high-elasticity rubber provided in this application adopts the following technical solution: An application of a wear-resistant, high-elasticity rubber as a raw material for shoe rubber outsoles and for the preparation of shoe soles.

[0024] By adopting the above technical solution, it is beneficial to produce a shoe sole with excellent wear resistance and high resilience. At the same time, the shoe sole is not only not easy to slip, but also can maintain good overall performance for a long time and is not easily damaged.

[0025] In summary, the technical solution of this application has at least one of the following beneficial effects: 1. By introducing appropriate amounts of EVA resin and epoxidized natural rubber into a rubber system mainly composed of butadiene rubber and supplemented with natural rubber, a rubber with excellent wear resistance and high resilience can be obtained. Moreover, the rubber also has a high static friction coefficient and sliding friction coefficient when facing a wet and slippery surface, making it less prone to slipping on wet and slippery roads. It is suitable as a raw material for rubber outsoles to prepare shoe soles. At the same time, the tensile strength and heat aging resistance of the rubber are also good, which helps to ensure that the shoe soles made from this rubber can maintain good overall performance over a long period of time and are not easily damaged.

[0026] 2. By sulfonating EVA resin and then combining it with vulcanizing auxiliaries containing magnesium oxide and zinc oxide, the overall performance of the rubber can be further improved. Detailed Implementation

[0027] The present application will be further described in detail below with reference to preparation examples, embodiments and comparative examples.

[0028] The butadiene rubber was purchased from China Petroleum & Chemical Corporation (Sinopec), and its grade is BR9000.

[0029] The natural rubber was purchased from Jingyang Rubber in Xishuangbanna, with the grade NR-SCR5.

[0030] The epoxidized natural rubber was purchased from Guangzhou Tianbenfeng Rubber, with the grade ENR-25, which has an epoxy content of 25 mol%.

[0031] The EVA resins were specifically purchased from BASF Yangzi, specifically the grades EVA-V4110J and EVA-V5110J. EVA-V4110J has a vinyl acetate content of 14% and a melt flow index of 2.5 g / 10 min; EVA-V5110J has a vinyl acetate content of 18% and a melt flow index of 2.7 g / 10 min. The aramid pulp was specifically purchased from Shenzhen Xinxian Technology, and the length of the aramid pulp was 0.6-1mm.

[0032] Preparation Example

[0033]

Preparation Example 1

[0034] Example

[0035]

Example 1

[0036] In this embodiment, the composite rubber matrix includes 65 kg of butadiene rubber, 30 kg of natural rubber, and 5 kg of epoxidized natural rubber.

[0037] The specific grade of EVA resin selected is EVA-V4110J.

[0038] The compatibilizer is maleic anhydride-grafted EVA.

[0039] The wear-resistant filler is a composition of fumed silica and aramid pulp, comprising 35 kg of fumed silica and 1 kg of aramid pulp.

[0040] The silane coupling agent is silane coupling agent Si-75.

[0041] The vulcanization accelerator is a composition of accelerator CZ and accelerator DTDC, comprising 2 kg of accelerator CZ and 0.6 kg of accelerator DTDC.

[0042] The vulcanizing aid is a composition of stearic acid and zinc oxide, comprising 2 kg of stearic acid and 5 kg of zinc oxide.

[0043] The antioxidant is a composition of antioxidant 4020, antioxidant RD and antioxidant MB, comprising 1.5 kg of antioxidant 4020, 0.8 kg of antioxidant RD and 0.2 kg of antioxidant MB.

[0044] A method for preparing abrasion-resistant high-elasticity rubber includes the following steps: S1. First, place the composite rubber matrix in a mixer for mixing. After the composite rubber matrix is ​​completely melted and fully wraps the rollers, add EVA resin and compatibilizer, and continue mixing for 2 minutes until uniformly dispersed. Add vulcanizing aid and antioxidant, and continue mixing for 2 minutes until uniformly dispersed. Then add wear-resistant filler, and slowly add silane coupling agent by spraying during the mixing process. After the addition is completed, continue mixing for 5 minutes until uniformly dispersed. During the mixing process, the temperature should not exceed 150℃. After the mixing is completed, discharge the rubber and cool to obtain the first-stage rubber compound. S2. Sulfur, dicumyl peroxide and vulcanization accelerator are thoroughly mixed in advance to obtain vulcanization mixture. The first-stage rubber compound is placed in a low-temperature internal mixer for mixing. After the first-stage rubber compound is completely melted and fully wrapped around the rollers, 20% of the mass of the vulcanization mixture is added in 5 batches each time. After each addition, continue mixing for 1 minute until it is evenly dispersed before adding the next batch. After the addition is completed, continue mixing for 5 minutes. During the mixing process, the temperature should be controlled not to exceed 80°C. After the mixing is completed, the rubber compound is discharged and cooled to obtain the wear-resistant high-elasticity rubber.

[0045] An application of abrasion-resistant elastic rubber, specifically as a raw material for rubber outsoles in footwear and for the preparation of shoe soles.

[0046]

Example 2

[0047] In this embodiment, the composite rubber matrix includes 50 kg of butadiene rubber, 40 kg of natural rubber, and 10 kg of epoxidized natural rubber.

[0048] The EVA resin specifically selected is EVA-V5110J, and the EVA resin undergoes sulfonation treatment before being added and mixed. Specifically, the EVA resin is prepared by the sulfonation treatment method described in [Preparation Example 1].

[0049] The compatibilizer is maleic anhydride-grafted EVA.

[0050] The wear-resistant filler is a composition of fumed silica and aramid pulp, comprising 25 kg of fumed silica and 5 kg of aramid pulp.

[0051] The silane coupling agent is silane coupling agent Si-75.

[0052] The vulcanization accelerator is a composition of accelerator CZ and accelerator DTDC, comprising 3 kg of accelerator CZ and 1.2 kg of accelerator DTDC.

[0053] The vulcanizing aid is a composition of stearic acid, zinc oxide and magnesium oxide, comprising 2 kg of stearic acid, 5 kg of zinc oxide and 4 kg of magnesium oxide.

[0054] The antioxidant is a composition of antioxidant 4020, antioxidant RD and antioxidant MB, comprising 1.5 kg of antioxidant 4020, 1 kg of antioxidant RD and 0.5 kg of antioxidant MB.

[0055] A method for preparing abrasion-resistant high-elasticity rubber includes the following steps: S1. First, place the composite rubber matrix in a mixer for mixing. After the composite rubber matrix is ​​completely melted and fully wraps the rollers, add EVA resin and compatibilizer, and continue mixing for 3 minutes until uniformly dispersed. Add vulcanizing aid and antioxidant, and continue mixing for 3 minutes until uniformly dispersed. Then add wear-resistant filler, and slowly add silane coupling agent by spraying during the mixing process. After the addition is completed, continue mixing for 3 minutes until uniformly dispersed. During the mixing process, the temperature should not exceed 150℃. After the mixing is completed, discharge the rubber and cool to obtain the first-stage rubber compound. S2. Sulfur, dicumyl peroxide and vulcanization accelerator are thoroughly mixed in advance to obtain vulcanization mixture. The first-stage rubber compound is placed in a low-temperature internal mixer for mixing. After the first-stage rubber compound is completely melted and fully wrapped around the rollers, 20% of the mass of the vulcanization mixture is added in 5 batches each time. After each addition, continue mixing for 2 minutes until it is evenly dispersed before adding the next batch. During the mixing process, the temperature should be controlled not to exceed 80°C. After the mixing is completed, the rubber compound is discharged and cooled to obtain the wear-resistant high-elasticity rubber.

[0056]

Example 3

[0057] In this embodiment, the composite rubber matrix includes 65 kg of butadiene rubber, 25 kg of natural rubber, and 10 kg of epoxidized natural rubber.

[0058]

Example 4

[0059] In this embodiment, the compatibilizer is maleic anhydride-grafted SEBS.

[0060]

Example 5

[0061] In this embodiment, the wear-resistant filler is fumed silica.

[0062]

Example 6

[0063] In this embodiment, the wear-resistant filler is a composition of fumed silica and aramid pulp, comprising 30 kg of fumed silica and 6 kg of aramid pulp.

[0064]

Example 7

[0065] In this embodiment, the EVA resin was sulfonated before being added and mixed. Specifically, the EVA resin was prepared by the sulfonation treatment method described in [Preparation Example 1].

[0066] In this embodiment, the amount of vulcanizing aid added is 9 kg. The vulcanizing aid is a composition of stearic acid, zinc oxide and magnesium oxide, including 2 kg of stearic acid, 5 kg of zinc oxide and 2 kg of magnesium oxide.

[0067] Comparative Example

[0068] Comparative Example 1 The rubber differs from that in [Example 1] in that the composite rubber matrix is ​​different.

[0069] In this comparative example, no epoxidized natural rubber was added to the composite rubber matrix. Specifically, natural rubber was used to replace the epoxidized natural rubber in an equal amount. That is, the composite rubber matrix included 65 kg of butadiene rubber and 35 kg of natural rubber.

[0070] Comparative Example 2 A type of rubber, which differs from [Example 1] in that it does not contain EVA resin.

[0071] Comparative Example 3 The rubber differs from that in [Example 1] in that the composite rubber matrix is ​​different.

[0072] In this comparative example, the composite rubber matrix includes 65 kg of butadiene rubber, 15 kg of natural rubber, and 20 kg of epoxidized natural rubber.

[0073] Comparative Example 4 A type of rubber, different from the EVA resin in [Example 4].

[0074] In this comparative example, the EVA resin was sulfonated before being added and mixed. Specifically, the EVA resin was obtained by the sulfonation treatment method described in [Preparation Example 1].

[0075] Performance test data

[0076] Preparation of test samples: First, the corresponding rubber was prepared according to the formulation and preparation method of each embodiment and comparative example. Then, each embodiment and comparative example was vulcanized using a flat vulcanizing apparatus. The vulcanization temperature was set to 170-185℃, the vulcanization pressure was 10-12.5MPa, and the temperature and pressure were maintained for 30 minutes. After vulcanization, the sample was cooled to room temperature, the mold was opened, and the sample was discharged to obtain a flat test sample with a thickness of 2mm.

[0077] 1. Resilience: The resilience of the vulcanizates prepared in each example and comparative example was tested in accordance with GB / T 1681-2009 Determination of Resilience of Vulcanizates and the resilience (%) was recorded.

[0078] 2. Abrasion resistance: Tests were conducted according to ISO 4649 standard using a GT-7012-D DIN abrasion tester. The abrasion amount (mm) of the samples prepared in each embodiment and comparative example was recorded. 3 ).

[0079] 3. Anti-slip performance: The test shall be conducted in accordance with Method A of "HG / T 2729-1995 Determination of the coefficient of friction of vulcanized rubber and sheet by sliding method". The static friction coefficient and sliding friction coefficient of each sample under wet and slippery conditions shall be calculated and recorded.

[0080] 4. Tensile properties: The tensile strength (MPa) of the vulcanizates prepared in each example and comparative example was tested in accordance with GB / T 528-2009 Determination of tensile stress-strain properties of vulcanizates or thermoplastic rubbers. The tensile speed was 500 mm / min, and the results were retained to one decimal place.

[0081] 5. Heat aging resistance: Each sample was placed in an oven at 100℃ and baked for 72 hours. Then, the tensile properties were tested again, and the tensile strength (MPa) after heat aging was recorded. The results were retained to one decimal place.

[0082] Table 1. Partial Performance Test Data of Rubber

[0083] Based on Example 1 and Comparative Examples 1-2, and the data in Table 1, it can be seen that Example 1 of this application, by using EVA resin, combined with a composite rubber matrix containing a certain amount of epoxidized natural rubber, and other raw material additives, produces a rubber with excellent wear resistance and high resilience. Moreover, the rubber also has a high static friction coefficient and sliding friction coefficient when facing a wet and slippery surface, making it less prone to slipping on wet and slippery roads. It is suitable as a raw material for preparing shoe soles. At the same time, the tensile strength and heat aging resistance of the rubber are good, which helps to ensure that the shoe soles made from this rubber can maintain good comprehensive performance for a long time and are not easily damaged.

[0084] Comparative Example 1 and its data show that when the composite rubber matrix contains a small amount of epoxidized natural resin, although the resilience of the resulting rubber is reduced, its static friction coefficient and sliding friction coefficient on wet and slippery surfaces are significantly increased, and its tensile strength and heat aging resistance are also improved. This may be because the introduced epoxidized groups in the composite rubber matrix enhance intermolecular forces and improve the structure of the rubber vulcanization crosslinking network, thereby improving the overall performance of the rubber to a certain extent. Comparative Example 2 and its data show that when no EVA resin is added, the tensile strength of the rubber decreases significantly after long-term heat aging, and its wear resistance, anti-slip properties, and tensile strength also decrease to varying degrees, although the decrease is not significant. This indicates that EVA resin has a certain synergistic effect on improving the wear resistance, anti-slip properties, mechanical properties, and heat aging resistance of rubber, especially in terms of heat aging resistance, where its improvement effect is particularly prominent.

[0085] Based on Examples 1, 3, and Comparative Example 3, and the data in Table 1, it can be seen that as the proportion of epoxidized natural rubber in the composite rubber matrix increases, the wear resistance and anti-slip properties of the rubber improve slightly, but the resilience of the rubber decreases. Furthermore, when the proportion of epoxidized natural rubber increases further, the tensile strength of the rubber increases significantly, the resilience deteriorates further, and the wear resistance begins to decline. This means that a higher content of epoxidized natural rubber is not necessarily better. Since epoxidized natural rubber introduces epoxy groups, which have strong polarity and hydrogen bond forming ability, an appropriate amount of epoxy groups, in synergy with EVA resin and compatibilizers, can improve the composite interface between the composite rubber matrix and the filler. They can also participate in the vulcanization crosslinking reaction of the rubber, achieving multifunctional vulcanization. However, epoxy groups also interfere with the vulcanization system. The high density of vulcanization crosslinking in the rubber, coupled with the rigid segments formed by the epoxy groups, severely restricts the free movement of the molecular chains after vulcanization crosslinking, causing the resulting rubber to lose its overall flexibility and making it unsuitable as a raw material for preparing rubber outsoles.

[0086] Combining Examples 1 and 4 with the data in Table 1, it can be seen that in the rubber formulation system of Example 1, when maleic anhydride-grafted SEBS is used as the compatibilizer, it can improve the overall performance of the rubber to a certain extent compared with maleic anhydride-grafted EVA. This may be because maleic anhydride-grafted SEBS improves the compatibility of the composite rubber matrix with other additives, while the long-chain segments of SEBE also achieve entanglement synergy, which is conducive to promoting the overall improvement of the mechanical properties of the rubber.

[0087] Based on Examples 4-6 and the data in Table 1, it can be seen that although the introduction of aramid pulp leads to a decrease in rubber resilience, it effectively improves the rubber's abrasion resistance, tensile strength, and heat aging resistance. It also significantly improves the sliding friction of rubber on wet surfaces, making it less prone to slippage. However, the content of aramid pulp is not always better the higher it is. As can be seen from Example 6, when the content of aramid pulp is further increased, the rubber's resilience decreases significantly. Therefore, to ensure that the rubber has good elasticity and is suitable as a raw material for shoe rubber outsoles, aramid pulp should not be added in excessive amounts.

[0088] Based on Examples 4, 7, and Comparative Example 4, and the data in Table 1, it can be seen that, while maintaining the formulation system of Example 4, simply sulfonating the EVA resin leads to a significant decrease in various properties of the rubber. However, adding an appropriate amount of magnesium oxide further improves the rubber's properties, and the overall performance is superior to that of the EVA resin before sulfonation. This may be because the sulfonate groups introduced during EVA resin sulfonation release acidic products during vulcanization, resulting in an overall acidic vulcanization environment. This directly affects the sulfur-peroxide vulcanization system, severely inhibiting the vulcanization reaction and leading to incomplete rubber vulcanization, thus producing a series of negative effects. Magnesium oxide, as an additional acid acceptor, can synergistically bind with the acidic products released by the sulfonate groups during vulcanization, maintaining the system in a central or slightly alkaline environment, which is beneficial for ensuring the normal progress of the vulcanization reaction. In addition, after sulfonation treatment, an appropriate amount of double bonds can be introduced into the EVA resin. Under the premise of ensuring that the vulcanization reaction can proceed normally, the introduced double bonds can promote the further reaction between the EVA resin and the composite rubber matrix, thereby further improving the overall performance of the rubber.

[0089] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this specific embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A wear-resistant, high-elasticity rubber, characterized in that: Includes the following quantities of raw materials: Composite rubber matrix: 100 parts; EVA resin: 5-10 parts; Compatibilizer: 2.5-5 parts; Wear-resistant filler: 30-36 parts; Silane coupling agent: 3.5-5 parts; Sulfur: 0.2-0.6 parts; Dicumyl peroxide: 1-1.4 parts; Vulcanization accelerator: 2.6-4.2 parts; Vulcanizing aid: 7-11 parts; Anti-aging agent: 2.5-3 parts; The composite rubber matrix includes butadiene rubber, natural rubber and epoxidized natural rubber, and the mass ratio of butadiene rubber, natural rubber and epoxidized natural rubber is (50-65):(25-40):(5-10).

2. The wear-resistant high-elastic rubber according to claim 1, characterized in that: The EVA resin is sulfonated before being added and mixed, and the vulcanizing agent is specifically a composition of stearic acid, zinc oxide and magnesium oxide.

3. The wear-resistant high-elastic rubber according to claim 2, characterized in that: The sulfonation treatment of the EVA resin includes the following steps: First, the EVA resin is thoroughly dried, then heated to 150-160℃ for open milling. After the EVA resin has fully coated the rollers, sulfonating agent and antioxidant are added, and the open milling continues for 8-12 minutes. After the open milling is completed, the rubber material is discharged and allowed to cool to room temperature before being fully pulverized to obtain the sulfonated EVA resin.

4. The wear-resistant high-elastic rubber according to claim 2, characterized in that: The mass ratio of stearic acid, zinc oxide and magnesium oxide is 1:3:(1-2).

5. The wear-resistant high-elastic rubber according to claim 1, characterized in that: The compatibilizer is either maleic anhydride-grafted SEBS or maleic anhydride-grafted EVA.

6. The wear-resistant high-elastic rubber according to claim 1, characterized in that: The wear-resistant filler is a composition of fumed silica and aramid pulp, wherein the mass ratio of fumed silica to aramid pulp is (25-35):(1-6).

7. The wear-resistant high-elastic rubber according to claim 1, characterized in that: The vulcanization accelerator is a combination of accelerator CZ and accelerator DTDC, and the mass ratio of accelerator CZ to accelerator DTDC is (2-3):(0.6-1.2).

8. The wear-resistant high-elastic rubber according to claim 1, characterized in that: The antioxidant is a composition of antioxidant 4020, antioxidant RD and antioxidant MB, and the mass ratio of antioxidant 4020, antioxidant RD and antioxidant MB is 1.5:(0.8-1):(0.2-0.5).

9. A method for preparing abrasion-resistant high-elasticity rubber, used to prepare the abrasion-resistant high-elasticity rubber as described in any one of claims 1-8, characterized in that, Includes the following steps: S1. The composite rubber matrix is ​​mixed. After the composite rubber matrix is ​​fully wrapped around the roller, the EVA resin and the compatibilizer are added and mixed evenly. The vulcanizing agent and the antioxidant are added and mixed evenly. The wear-resistant filler is added and the silane coupling agent is slowly added during the mixing process and mixed evenly. During the mixing process, the temperature should be controlled not to exceed 120°C. After the mixing is completed, the rubber compound is discharged and cooled to obtain the first-stage rubber compound. S2. The sulfur, dicumyl peroxide and vulcanization accelerator are thoroughly mixed in advance to obtain a vulcanization mixture. The first-stage rubber compound is then mixed, and then an equal amount of the vulcanization mixture is added in multiple batches and mixed evenly. During the mixing process, the temperature should be controlled not to exceed 80°C. After the mixing is completed, the rubber compound is discharged and cooled to obtain the wear-resistant high-elasticity rubber.

10. An application of a wear-resistant high-elastic rubber, applicable to the wear-resistant high-elastic rubber as described in any one of claims 1-8, characterized in that: It is used as a raw material for rubber outsoles in footwear and for making shoe soles.

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