Wear-resistant light rubber material and preparation method thereof

Abstract

The invention relates to the field of rubber materials, in particular to a wear-resistant light rubber material and a preparation method thereof.The rubber material is prepared from, by weight, 20-30 parts of natural rubber, 40-50 parts of butadiene styrene rubber, 10-20 parts of ethylene-vinyl acetate copolymer, 20-40 parts of white carbon black, 10-20 parts of carbon black, 5-15 parts of modified ceramic fiber and 3-5 parts of foaming agent. 1-3 parts of a silane coupling agent, 1-3 parts of a lubricant, 1.5-2.5 parts of a vulcanizing agent and 1-2 parts of an accelerant. Wherein the natural rubber provides high elasticity and tear resistance, the butadiene styrene rubber endows the material with excellent wear resistance and fatigue resistance, and the natural rubber and the butadiene styrene rubber are combined to form an elasticity-wear resistance complementary effect. The carbon black and the white carbon black are used as reinforcing agents, so that the hardness and the wear resistance of the material are improved; and the modified ceramic fibers form a rigid support network through directional distribution, so that external impact is resisted, and the strength, crack resistance and wear resistance are further enhanced.

Description

Technical Field

[0001] The present invention relates to the field of rubber materials, and in particular to a wear-resistant lightweight rubber material and a preparation method thereof. Background Art

[0002] Rubber products have a wide range of applications, including tires, shoes, gaskets, and more. However, existing rubber products are generally relatively heavy. With the continuous upgrading and optimization of products, rubber products are developing in the direction of being lighter, more comfortable, and more functional.

[0003] Rubber soles have been widely used due to their advantages such as wear resistance, high strength, and good weather resistance. First of all, due to the characteristics of its polymer structure, rubber soles have extremely strong wear resistance, especially in scenarios with frequent friction (such as tennis shoes and work boots). Rubber's wear resistance ranks among the best among mainstream sole materials, and its service life far exceeds that of materials such as EVA and PU. Secondly, the coefficient of friction between rubber and the ground is high, and it can still provide stable grip even in slippery environments such as water and oil. Studies have shown that the anti-slip properties of rubber soles are significantly better than those of materials such as PU and PVC, and are particularly suitable for scenarios that require high traction, such as safety shoes and hiking shoes. In addition, natural rubber has excellent elasticity and can absorb the impact of exercise and reduce joint pressure. Hard rubber is often used in basketball shoe soles, combining support and shock absorption effects; foam rubber further improves the softness and is suitable for running shoe midsoles.

[0004] However, rubber soles also have some defects. For example, the rubber density is relatively high, the overall weight of the sole is relatively large (especially natural rubber), and it is easy to get tired after walking for a long time. At the same time, the airtightness of the material leads to poor air permeability, which can easily cause stuffiness and odor in summer or after exercise. Therefore, lightweight and highly elastic foam rubber has become a popular sole material on the market. However, the strength of foam rubber is weaker than that of traditional rubber materials. Although it has a lighter weight, it abandons the advantages of high strength and high wear resistance of traditional rubber materials, and its tear resistance is also relatively insufficient. Therefore, it is necessary to improve the existing foam rubber materials. Summary of the Invention

[0005] In view of the problems existing in the prior art, the object of the present invention is to provide a wear-resistant lightweight rubber material and a preparation method thereof.

[0006] The purpose of the present invention is achieved by adopting the following technical solutions:

[0007] In a first aspect, the present invention provides a wear-resistant lightweight rubber material, which comprises the following steps, calculated by weight:

[0008] Natural rubber (NR) 20-30 parts, styrene-butadiene rubber (SBR) 40-50 parts, ethylene-vinyl acetate copolymer (EVA) 10-20 parts, white carbon black 20-40 parts, carbon black 10-20 parts, modified ceramic fiber 5-15 parts, foaming agent 3-5 parts, silane coupling agent 1-3 parts, lubricant 1-3 parts, vulcanizing agent 1.5-2.5 parts, accelerator 1-2 parts.

[0009] Preferably, the natural rubber (NR) is standard No. 5 rubber (SCR-5#) or standard No. 10 rubber (SCR-10#).

[0010] Preferably, the styrene-butadiene rubber (SBR) is at least one of SBR-1502, SBR-1712, and SBR-1723, more preferably SBR-1502, with a styrene content of 23.5%.

[0011] Preferably, the ethylene-vinyl acetate copolymer (EVA) has a VA content in the range of 18%-28%, and is at least one of EVA-V4110J, EVA-V5110J, and EVA-V6110J. More preferably, EVA-V5110J has a melt index of 2.7 g / 10 min (190°C / 2.16 kg) and a VA content of 18.5%.

[0012] Preferably, the blowing agent is azodicarbonamide (blowing agent AC) or p-toluenesulfonylhydrazide (OBSH).

[0013] Preferably, the silane coupling agent is at least one of KH-550, KH-560, and KH-570.

[0014] Preferably, the lubricant is at least one of stearic acid, zinc stearate, and magnesium stearate, more preferably zinc stearate.

[0015] Preferably, the vulcanizing agent is sulfur.

[0016] Preferably, the accelerator is at least one of vulcanization accelerator CZ, vulcanization accelerator NS, vulcanization accelerator TMTD, and vulcanization accelerator M. More preferably, the vulcanization accelerator CZ and the vulcanization accelerator TMTD are mixed in a mass ratio of 2-4:1.

[0017] Preferably, the silica is precipitated silica, with the brand name Ultrasil VN3.

[0018] Preferably, the carbon black is carbon black N330 or carbon black N220.

[0019] Preferably, the preparation method of the modified ceramic fiber comprises:

[0020] S1. Weigh (3-mercaptopropyl)trimethoxysilane, ethanol, and deionized water, mix them, and stir them magnetically at room temperature. Add ceramic fiber and stir them magnetically at 40-60° C. for 5-10 hours. After the reaction is complete, centrifuge to separate the precipitate, wash it with water, and dry it to obtain mercaptolated ceramic fiber.

[0021] S2, weighing 3-aminopropanol vinyl ether and adding it to the solvent toluene, then adding p-toluenesulfonic acid as a catalyst, stirring evenly to obtain reaction solution A; weighing p-trifluoromethylbenzaldehyde and adding it to the solvent toluene, stirring evenly to obtain reaction solution B;

[0022] S3, placing reaction solution A in an ice-water bath, introducing nitrogen as a protective gas, stirring until the reaction solution temperature is lower than 10°C, adding reaction solution B dropwise, and adding all of it dropwise within half an hour, then removing the ice-water bath, stirring at room temperature for 8-16 hours, and after the reaction is completed, removing the solvent, purifying, and obtaining a modifier;

[0023] S4. Weigh the modifier and add it to toluene, add the thiol-modified ceramic fiber, ultrasonically disperse it evenly, add a photoinitiator, introduce nitrogen as a protective gas, stir and react under ultraviolet light, and the reaction time is 0.5-3h. After the reaction is completed, centrifuge and separate the precipitate, wash it with ethanol for at least three times, and vacuum dry it to obtain the modified ceramic fiber.

[0024] Preferably, in S1, the mass volume ratio of ceramic fiber, (3-mercaptopropyl)trimethoxysilane, ethanol and deionized water is 1 g: (0.05-0.3) g: (10-20) mL: (5-10) mL.

[0025] Preferably, in the reaction solution A of S2, the mass volume ratio of 3-aminopropanol vinyl ether, p-toluenesulfonic acid and solvent toluene is 1.01 g: (0.01-0.05) g: (10-20) mL.

[0026] Preferably, in the reaction solution B of S2, the mass volume ratio of trifluoromethylbenzaldehyde to the solvent toluene is 1.74g:(10-20)mL.

[0027] Preferably, in S3, the volume ratio of reaction liquid A to reaction liquid B is 1:1.05-1.1.

[0028] Preferably, in S4, the mass volume ratio of the thiolated ceramic fiber, the modifier and toluene is 1 g: (0.21-0.42) g: (10-20) mL.

[0029] Preferably, in S4, the photoinitiator is benzoin dimethyl ether, and the amount added is 2%-6% of the mass of the modifier.

[0030] Preferably, the ceramic fiber is at least one of aluminum silicate fiber (Al2O3 content of 45%-55%, SiO2 content of 40%-50%), alumina fiber, zirconium oxide fiber, silicon carbide fiber, silicon nitride fiber, and aluminum nitride ceramic. More preferably, it is alumina fiber (Al2O3 ≥ 95%).

[0031] Preferably, the ceramic fiber has a diameter of 2-5 μm and a length of 1-10 mm; more preferably, a diameter of 2-3 μm and a length of 3-5 mm.

[0032] In a second aspect, the present invention provides a method for preparing a wear-resistant lightweight rubber material, comprising the following steps:

[0033] Step 1: weigh natural rubber (NR), styrene-butadiene rubber (SBR), and ethylene-vinyl acetate copolymer (EVA) and add them into an internal mixer, control the temperature at 80-100° C., and mix for 3-5 minutes;

[0034] Step 2, adding white carbon black, modified ceramic fiber, lubricant and silane coupling agent, and mixing for 5-8 minutes;

[0035] Step 3: Cool down to below 70°C, add foaming agent, vulcanizing agent and accelerator, and mix for 2-3 minutes;

[0036] Step 4: Transfer the mixed rubber material to a flat vulcanizing press and pre-press at 120-130°C for 2-3 minutes;

[0037] Step 5, then vulcanize at 140-150°C and 10-15MPa pressure for 5-8 minutes, then raise the temperature to 160-170°C and maintain pressure vulcanization for 10-15 minutes;

[0038] Step 6: After cooling and shaping in the mold, demoulding is carried out to obtain a wear-resistant lightweight rubber material.

[0039] The beneficial effects of the present invention are:

[0040] 1. This invention prepares a lightweight rubber material in which natural rubber provides high elasticity and tear resistance, while styrene-butadiene rubber imparts excellent wear resistance and fatigue resistance. The combination of the two creates a complementary elastic-wear resistance effect. Carbon black and silica act as reinforcing agents, enhancing the material's hardness and wear resistance. Modified ceramic fibers, through their directional distribution, form a rigid support network that resists external impact, further enhancing strength, crack resistance, and wear resistance.

[0041] 2. This invention enhances the performance of rubber by introducing modified ceramic fibers into the rubber material. First, ceramic fibers have a high strength-to-weight ratio, effectively reducing the overall weight of the rubber while maintaining strength, thereby ensuring lightweight properties. Second, the modified ceramic fibers contain a large number of ether groups (-O-), sulfide groups (-S-), trifluoromethyl groups (-CF3), and Schiff base groups (-C=N-) on their surfaces, which not only enhance interfacial bonding with the rubber but also optimize and functionalize the dynamic crosslinking of the rubber material, significantly improving the strength, toughness, and wear resistance of the rubber material.

[0042] 3. The preparation of modified ceramic fibers uses mercaptosilanized ceramic fibers as the substrate, and uses the product of aldehyde-amine condensation of 3-aminopropanol vinyl ether and trifluoromethylbenzaldehyde as the modifier. The unsaturated olefinic bonds in the modifier then react with the mercaptolated ceramic fibers to undergo a mercapto-ene click reaction, thereby obtaining modified ceramic fibers coated with a variety of chemical groups. The fluorinated benzene ring structure of trifluoromethylbenzaldehyde promotes cross-linking and enhances stability in rubber materials. Combining with ether-bonded 3-aminopropanol vinyl ether to form a modifier further enhances the rubber's elasticity, wear resistance, and weather resistance. The modified ceramic fibers achieve breakthroughs in the mechanical and functional properties of rubber materials, meeting the industry's demand for both lightness and high strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The present invention is further described with reference to the accompanying drawings. However, the embodiments in the accompanying drawings do not constitute any limitation to the present invention. A person skilled in the art can obtain other drawings based on the following drawings without creative effort.

[0044] Figure 1 is a schematic diagram of a scanning electron microscope (SEM) of the rubber material prepared in Example 1 of the present invention;

[0045] Figure 2 This is a physical schematic diagram of the rubber material prepared in Example 1 of the present invention. DETAILED DESCRIPTION

[0046] The technical solution of the present invention is described below through specific examples. It should be understood that the one or more method steps mentioned in the present invention do not exclude the presence of other method steps before and after the combination step or the insertion of other method steps between these explicitly mentioned steps; it should also be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. Moreover, unless otherwise specified, the numbering of each method step is only a convenient tool for identifying each method step, and is not intended to limit the order of arrangement of each method step or to define the scope of the present invention. Changes or adjustments in their relative relationships, without substantially changing the technical content, should also be regarded as the scope of the present invention.

[0047] In order to better understand the above technical solutions, exemplary embodiments of the present invention are described in more detail below. Although exemplary embodiments of the present invention are shown, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0048] The present invention will be further described below with reference to the following examples.

[0049] Example 1

[0050] A wear-resistant lightweight rubber material, calculated by weight, comprises the following steps:

[0051] 25 parts of natural rubber (NR), 45 parts of styrene-butadiene rubber (SBR), 15 parts of ethylene-vinyl acetate copolymer (EVA), 30 parts of white carbon black, 15 parts of carbon black, 10 parts of modified ceramic fiber, 4 parts of foaming agent, 2 parts of silane coupling agent, 2 parts of lubricant, 2 parts of vulcanizing agent, and 1.5 parts of accelerator.

[0052] Among them, the natural rubber (NR) is standard No. 5 rubber (SCR-5#); the styrene-butadiene rubber (SBR) is SBR-1502, and the styrene content is 23.5%; the ethylene-vinyl acetate copolymer (EVA) is V5110J, with a melt index of 2.7g / 10min (190℃ / 2.16kg) and a VA content of 18.5%.

[0053] Among them, the foaming agent is azodicarbonamide (foaming agent AC); the silane coupling agent is KH-550; the lubricant is zinc stearate; the vulcanizing agent is sulfur; the accelerator is a mixture of vulcanization accelerator CZ and vulcanization accelerator TMTD in a mass ratio of 3:1; the white carbon black is precipitated white carbon black with the brand name Ultrasil VN3; and the carbon black is carbon black N330.

[0054] The preparation method of the modified ceramic fiber comprises:

[0055] S1. Weigh 0.2 g of (3-mercaptopropyl)trimethoxysilane, 15 mL of ethanol, and 8 mL of deionized water, mix them, and stir them magnetically at room temperature. Add 1 g of ceramic fiber (alumina fiber, Al2O3 content ≥95%, diameter 2-3 μm, length 3-5 mm), and stir them magnetically at 50°C for 8 h. After the reaction is complete, centrifuge to separate the precipitate, wash it with water, and dry it to obtain the mercaptolated ceramic fiber.

[0056] S2, weighing 1.01g of 3-aminopropanol vinyl ether, adding it to 15mL of toluene solvent, adding 0.03g of p-toluenesulfonic acid as a catalyst, stirring evenly, to obtain reaction solution A; weighing 1.74g of p-trifluoromethylbenzaldehyde, adding it to 15mL of toluene solvent, stirring evenly, to obtain reaction solution B;

[0057] S3, the reaction solution A is placed in an ice-water bath, nitrogen is introduced as a protective gas, and the reaction solution is stirred until the temperature of the reaction solution is lower than 10 ° C, and the reaction solution B is added dropwise, the volume ratio of reaction solution A to reaction solution B is 1:1.08, and all are added dropwise within half an hour, and then the ice-water bath is removed, 3A molecular sieves are added for dehydration, and the mixture is stirred at room temperature for 12 hours. After the reaction is completed, the solvent is distilled off under reduced pressure, and the mixture is purified by silica gel column chromatography (eluent: ethyl acetate / n-hexane = 1:2) to obtain a modifier;

[0058] S4, weigh 0.32g of modifier and add it to 15mL of toluene, add 1g of thiolated ceramic fiber, disperse it evenly by ultrasonic, add 4% of the mass of modifier, dimethyl benzoate, introduce nitrogen as protective gas, and conduct the ultraviolet radiation at a wavelength of 365nm and an intensity of 18mW / cm 2 The reaction was stirred under ultraviolet light for 1.5 h. After the reaction was completed, the precipitate was separated by centrifugation, washed with ethanol for at least three times, and vacuum dried to obtain modified ceramic fibers.

[0059] The method for preparing the above-mentioned wear-resistant lightweight rubber material comprises the following steps:

[0060] Step 1: weigh natural rubber (NR), styrene-butadiene rubber (SBR), and ethylene-vinyl acetate copolymer (EVA) and add them into an internal mixer, control the temperature at 90° C., and mix for 5 minutes;

[0061] Step 2: adding white carbon black, modified ceramic fiber, lubricant and silane coupling agent, and mixing for 6 minutes;

[0062] Step 3: Cool down to below 70°C, add foaming agent, vulcanizing agent and accelerator, and mix for 2 minutes;

[0063] Step 4: Transfer the mixed rubber material to a flat vulcanizing press and pre-press at 120-130°C for 3 minutes;

[0064] Step 5: vulcanize at 150°C and 10 MPa pressure for 6 minutes, then raise the temperature to 160°C and maintain pressure vulcanization for 12 minutes;

[0065] Step 6: After cooling and shaping in the mold, demoulding is carried out to obtain a wear-resistant lightweight rubber material.

[0066] Example 2

[0067] A wear-resistant lightweight rubber material differs from Example 1 only in that the preparation method of the modified ceramic fiber is different.

[0068] The preparation method of the modified ceramic fiber comprises:

[0069] S1. Weigh 0.05 g of (3-mercaptopropyl)trimethoxysilane, 10 mL of ethanol, and 5 mL of deionized water, mix them, and stir them magnetically at room temperature. Add 1 g of ceramic fiber (alumina fiber, Al2O3 content ≥95%, diameter 2-3 μm, length 3-5 mm), and stir them magnetically at 40°C for 5 h. After the reaction is complete, centrifuge to separate the precipitate, wash it with water, and dry it to obtain the mercaptolated ceramic fiber.

[0070] S2, weighing 1.01g of 3-aminopropanol vinyl ether and adding it to 10mL of toluene solvent, then adding 0.01g of p-toluenesulfonic acid as a catalyst, stirring evenly to obtain reaction solution A; weighing 1.74g of p-trifluoromethylbenzaldehyde and adding it to 10mL of toluene solvent, stirring evenly to obtain reaction solution B;

[0071] S3, the reaction solution A is placed in an ice-water bath, nitrogen is introduced as a protective gas, and the reaction solution is stirred until the temperature of the reaction solution is lower than 10 ° C, and the reaction solution B is added dropwise, the volume ratio of reaction solution A to reaction solution B is 1:1.05, and all are added dropwise within half an hour, and then the ice-water bath is removed, 3A molecular sieves are added for dehydration, and the mixture is stirred at room temperature for 8 hours. After the reaction is completed, the solvent is distilled off under reduced pressure, and the mixture is purified by silica gel column chromatography (eluent: ethyl acetate / n-hexane = 1:2) to obtain a modifier;

[0072] S4, weigh 0.21g of modifier and add it to 10mL of toluene, add 1g of thiolated ceramic fiber, ultrasonically disperse it evenly, add 2% of benzoin dimethyl ether by weight of the modifier, introduce nitrogen as protective gas, and conduct the experiment at a wavelength of 365nm and an intensity of 12mW / cm 2 The reaction was stirred under ultraviolet light for 0.5 h. After the reaction was completed, the precipitate was separated by centrifugation, washed with ethanol for at least three times, and vacuum dried to obtain modified ceramic fibers.

[0073] Example 3

[0074] A wear-resistant lightweight rubber material differs from Example 1 only in that the preparation method of the modified ceramic fiber is different.

[0075] The preparation method of the modified ceramic fiber comprises:

[0076] S1. Weigh 0.3 g of (3-mercaptopropyl)trimethoxysilane, 20 mL of ethanol, and 10 mL of deionized water, mix them, and stir them magnetically at room temperature. Add 1 g of ceramic fiber (alumina fiber, Al2O3 content ≥95%, diameter 2-3 μm, length 3-5 mm), and stir them magnetically at 60°C for 10 h. After the reaction is complete, centrifuge to separate the precipitate, wash it with water, and dry it to obtain the mercaptolated ceramic fiber.

[0077] S2, weighing 1.01g 3-aminopropanol vinyl ether was added to 20mL of toluene solvent, and then 0.05g of p-toluenesulfonic acid was added as a catalyst, and stirred to obtain reaction solution A; weighing 1.74g of p-trifluoromethylbenzaldehyde was added to 20mL of toluene solvent, and stirred to obtain reaction solution B;

[0078] S3, the reaction solution A is placed in an ice-water bath, nitrogen is introduced as a protective gas, and the reaction solution is stirred until the temperature of the reaction solution is lower than 10 ° C, and the reaction solution B is added dropwise, the volume ratio of reaction solution A to reaction solution B is 1:1.1, and all are added dropwise within half an hour, and then the ice-water bath is removed, 3A molecular sieves are added for dehydration, and the mixture is stirred at room temperature for 16 hours. After the reaction is completed, the solvent is distilled off under reduced pressure, and the mixture is purified by silica gel column chromatography (eluent: ethyl acetate / n-hexane = 1:2) to obtain a modifier;

[0079] S4, weigh 0.42g of modifier and add it to 20mL of toluene, add 1g of thiolated ceramic fiber, disperse it evenly by ultrasonic, add 6% of benzoin dimethyl ether by weight of the modifier, introduce nitrogen as protective gas, and conduct the experiment at a wavelength of 365nm and an intensity of 24mW / cm 2 The reaction was stirred under ultraviolet light for 3 hours. After the reaction was completed, the precipitate was separated by centrifugation, washed with ethanol for at least three times, and vacuum dried to obtain modified ceramic fibers.

[0080] Example 4

[0081] A wear-resistant lightweight rubber material, calculated by weight, comprises the following steps:

[0082] 20 parts of natural rubber (NR), 40 parts of styrene-butadiene rubber (SBR), 10 parts of ethylene-vinyl acetate copolymer (EVA), 20 parts of white carbon black, 10 parts of carbon black, 5 parts of modified ceramic fiber, 3 parts of foaming agent, 1 part of silane coupling agent, 1 part of lubricant, 1.5 parts of vulcanizing agent, and 1-2 parts of accelerator.

[0083] Among them, the natural rubber (NR) is standard No. 5 rubber (SCR-5#); the styrene-butadiene rubber (SBR) is SBR-1502; and the ethylene-vinyl acetate copolymer (EVA) brand is EVA-V4110J.

[0084] Among them, the foaming agent is azodicarbonamide (foaming agent AC); the silane coupling agent is KH-550; the lubricant is stearic acid; the vulcanizing agent is sulfur; the accelerator is vulcanization accelerator CZ; the white carbon black is precipitated white carbon black with the brand name Ultrasil VN3; and the carbon black is carbon black N330.

[0085] The method for preparing the above-mentioned wear-resistant lightweight rubber material comprises the following steps:

[0086] Step 1: weigh natural rubber (NR), styrene-butadiene rubber (SBR), and ethylene-vinyl acetate copolymer (EVA) and add them into an internal mixer, control the temperature to 80° C., and mix for 3 minutes;

[0087] Step 2: adding white carbon black, modified ceramic fiber, lubricant and silane coupling agent, and mixing for 5 minutes;

[0088] Step 3: Cool down to below 70°C, add foaming agent, vulcanizing agent and accelerator, and mix for 2 minutes;

[0089] Step 4: transfer the mixed rubber material to a flat vulcanizing press and pre-press at 120°C for 2 minutes;

[0090] Step 5: vulcanize at 140°C and 10 MPa pressure for 5 minutes, then raise the temperature to 160°C and maintain pressure vulcanization for 10 minutes;

[0091] Step 6: After cooling and shaping in the mold, demoulding is carried out to obtain a wear-resistant lightweight rubber material.

[0092] Example 5

[0093] A wear-resistant lightweight rubber material, calculated by weight, comprises the following steps:

[0094] 30 parts of natural rubber (NR), 50 parts of styrene-butadiene rubber (SBR), 20 parts of ethylene-vinyl acetate copolymer (EVA), 40 parts of white carbon black, 20 parts of carbon black, 15 parts of modified ceramic fiber, 5 parts of foaming agent, 3 parts of silane coupling agent, 3 parts of lubricant, 2.5 parts of vulcanizing agent, and 2 parts of accelerator.

[0095] Among them, the natural rubber (NR) is standard No. 10 rubber (SCR-10#); the styrene-butadiene rubber (SBR) is SBR-1723; and the ethylene-vinyl acetate copolymer (EVA) brand is EVA-V6110J.

[0096] The foaming agent is p-toluenesulfonyl hydrazide (OBSH); the silane coupling agent is KH-570; the lubricant is magnesium stearate; the vulcanizing agent is sulfur; the accelerator is vulcanization accelerator NS; the silica is precipitated silica with the brand name Ultrasil VN3; and the carbon black is carbon black N220.

[0097] The method for preparing the above-mentioned wear-resistant lightweight rubber material comprises the following steps:

[0098] Step 1: weigh natural rubber (NR), styrene-butadiene rubber (SBR), and ethylene-vinyl acetate copolymer (EVA) and add them into an internal mixer, control the temperature at 100° C., and mix for 5 minutes;

[0099] Step 2: adding white carbon black, modified ceramic fiber, lubricant and silane coupling agent, and mixing for 8 minutes;

[0100] Step 3: Cool down to below 70°C, add foaming agent, vulcanizing agent and accelerator, and mix for 3 minutes;

[0101] Step 4: transfer the mixed rubber material to a flat vulcanizing press and pre-press at 130°C for 3 minutes;

[0102] Step 5: vulcanize at 150°C and 15 MPa pressure for 8 minutes, then raise the temperature to 170°C and maintain pressure vulcanization for 15 minutes;

[0103] Step 6: After cooling and shaping in the mold, demoulding is carried out to obtain a wear-resistant lightweight rubber material.

[0104] Comparative Example 1

[0105] A lightweight rubber material, which differs from Example 1 in that the modified ceramic fiber is replaced by conventional ceramic fiber (alumina fiber, Al2O3 content ≥95%, diameter 2-3μm, length 3-5mm), and other components and preparation methods are the same.

[0106] Comparative Example 2

[0107] A lightweight rubber material, which differs from Example 1 in that the modified ceramic fiber is replaced by thiol-modified ceramic fiber, and the other components and preparation methods are the same.

[0108] The preparation method of mercaptolated ceramic fiber includes:

[0109] Weigh 0.2 g (3-mercaptopropyl)trimethoxysilane, 15 mL ethanol and 8 mL deionized water, mix them, stir them magnetically at room temperature, add 1 g ceramic fiber (alumina fiber, Al2O3 content ≥95%, diameter 2-3 μm, length 3-5 mm), stir them magnetically at 50°C for 8 h, and after the reaction is completed, centrifuge to separate the precipitate, wash it with water and dry it to obtain thiol-modified ceramic fiber.

[0110] Comparative Example 3

[0111] A lightweight rubber material differs from Example 1 in that the modified ceramic fiber is replaced by a mixture of thiolated ceramic fiber and p-trifluoromethylbenzaldehyde, with the mass ratio of thiolated ceramic fiber to p-trifluoromethylbenzaldehyde being 1:0.32. Other components and preparation methods are the same.

[0112] To more clearly illustrate the present invention, the rubber materials prepared in the preferred embodiment 1 of the present invention and the control examples 1-3 corresponding to the preferred embodiment 1 were tested and compared in terms of performance. The test items included tensile strength (ASTM D412), tear strength (ASTM D624), abrasion resistance (GB / T 1689-2014, Akron abrasion), high temperature resistance (ASTM D573, hot air accelerated aging test, 70°C × 72h), and weather resistance (ASTM D1149, ozone aging, ozone concentration 40pphm, aging 48h).

[0113] The results are shown in Table 1:

[0114] Table 1 Performance of different rubber materials

[0115]

[0116] It can be seen from Table 1 that, compared with Comparative Examples 1-3, the lightweight rubber material prepared in Example 1 of the present invention not only has high strength and strong crack resistance, but also has better wear resistance and aging resistance.

[0117] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0118] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A wear-resistant lightweight rubber material, characterized in that: Calculated by weight, the method comprises the following steps: 20-30 parts of natural rubber, 40-50 parts of styrene-butadiene rubber, 10-20 parts of ethylene-vinyl acetate copolymer, 20-40 parts of white carbon black, 10-20 parts of carbon black, 5-15 parts of modified ceramic fiber, 3-5 parts of foaming agent, 1-3 parts of silane coupling agent, 1-3 parts of lubricant, 1.5-2.5 parts of vulcanizing agent, 1-2 parts of accelerator; The modified ceramic fiber is obtained by using the product of aldehyde-amine condensation of 3-aminopropanol vinyl ether and trifluoromethylbenzaldehyde as a modifier, and performing a thiol-ene click chemistry reaction on the modifier and the thiol-modified ceramic fiber.

2. A wear-resistant lightweight rubber material according to claim 1, characterized in that: The natural rubber is standard No. 5 rubber or standard No. 10 rubber; the styrene-butadiene rubber is at least one of SBR-1502, SBR-1712, and SBR-1723; the VA content in the ethylene-vinyl acetate copolymer is in the range of 18%-28%, and the brand is at least one of EVA-V4110J, EVA-V5110J, and EVA-V6110J.

3. The wear-resistant lightweight rubber material according to claim 1, characterized in that: The foaming agent is azodicarbonamide or p-toluenesulfonyl hydrazide; the silane coupling agent is at least one of KH-550, KH-560, and KH-570; and the lubricant is at least one of stearic acid, zinc stearate, and magnesium stearate.

4. The wear-resistant lightweight rubber material according to claim 1, characterized in that: The vulcanizing agent is sulfur; the accelerator is at least one of vulcanization accelerator CZ, vulcanization accelerator NS, vulcanization accelerator TMTD, and vulcanization accelerator M.

5. The wear-resistant lightweight rubber material according to claim 1, characterized in that: The preparation method of the modified ceramic fiber comprises: S1. Weigh (3-mercaptopropyl)trimethoxysilane, ethanol, and deionized water, mix them, and stir them evenly under magnetic stirring at room temperature. Add ceramic fiber and stir them under magnetic stirring at a temperature of 40-60° C. for 5-10 hours. After the reaction is complete, collect the precipitate, wash it with water, and dry it to obtain mercaptolated ceramic fiber. S2, weighing 3-aminopropanol vinyl ether and adding it to the solvent toluene, then adding p-toluenesulfonic acid, stirring evenly, to obtain reaction solution A; weighing p-trifluoromethylbenzaldehyde and adding it to the solvent toluene, stirring evenly, to obtain reaction solution B; S3, placing reaction solution A in an ice-water bath, introducing nitrogen as a protective gas, stirring until the reaction solution temperature is lower than 10°C, adding reaction solution B dropwise, and adding all of it dropwise within half an hour, then removing the ice-water bath, stirring at room temperature for 8-16 hours, and after the reaction is completed, removing the solvent, purifying, and obtaining a modifier; S4. Weigh the modifier and add it to toluene, add the thiol-modified ceramic fiber, ultrasonically disperse it evenly, add a photoinitiator, introduce nitrogen as a protective gas, stir and react under ultraviolet light for 0.5-3 hours. After the reaction is completed, centrifuge, wash and dry to obtain the modified ceramic fiber.

6. The wear-resistant lightweight rubber material according to claim 5, characterized in that: In the S1, the mass volume ratio of ceramic fiber, (3-mercaptopropyl)trimethoxysilane, ethanol and deionized water is 1 g: (0.05-0.3) g: (10-20) mL: (5-10) mL.

7. The wear-resistant lightweight rubber material according to claim 5, characterized in that: In the reaction solution A of S2, the mass volume ratio of 3-aminopropanol vinyl ether, p-toluenesulfonic acid and solvent toluene is 1.01 g:(0.01-0.05) g:(10-20) mL; in the reaction solution B of S2, the mass volume ratio of p-trifluoromethylbenzaldehyde and solvent toluene is 1.74 g:(10-20) mL.

8. The wear-resistant lightweight rubber material according to claim 5, characterized in that: In S3, the volume ratio of reaction solution A to reaction solution B is 1:1.05-1.

1.

9. The wear-resistant lightweight rubber material according to claim 5, characterized in that: In the S4, the mass volume ratio of the thiolated ceramic fiber, the modifier and toluene is 1 g: (0.21-0.42) g: (10-20) mL.

10. A method for preparing the wear-resistant lightweight rubber material according to claim 1, characterized in that: The following steps are involved: Step 1, weighing natural rubber, styrene-butadiene rubber, and ethylene-vinyl acetate copolymer, adding them into an internal mixer, controlling the temperature at 80-100° C., and mixing for 3-5 minutes; Step 2, adding white carbon black, modified ceramic fiber, lubricant and silane coupling agent, and mixing for 5-8 minutes; Step 3: Cool down to below 70°C, add foaming agent, vulcanizing agent and accelerator, and mix for 2-3 minutes; Step 4: Transfer the mixed rubber material to a flat vulcanizing press and pre-press at 120-130°C for 2-3 minutes; Step 5, then vulcanize at 140-150°C and 10-15MPa pressure for 5-8 minutes, then raise the temperature to 160-170°C and maintain pressure vulcanization for 10-15 minutes; Step 6: After cooling and shaping in the mold, demoulding is carried out to obtain a wear-resistant lightweight rubber material.

Images