Anti-aging wear-resistant rubber part and preparation process thereof

Abstract

The invention relates to the technical field of wear-resistant rubber, and particularly discloses an anti-aging wear-resistant rubber part and a preparation process thereof.The anti-aging wear-resistant rubber part is prepared by mixing the following raw materials in parts by mass: 48-60 parts of isoprene rubber, 5-8 parts of a composite modified component, 3-5 parts of white carbon black, 1-2 parts of an anti-aging agent and 1-1.2 parts of maleic anhydride. Heating and pre-plasticizing, adding maleic anhydride, initiating, reducing the temperature, replenishing isoprene rubber, adding a composite modified component, white carbon black and an anti-aging agent into the system, mixing, molding, and cooling, thereby obtaining the product. Wherein the composite modified component is obtained by performing alkali etching and zinc salt dipping treatment on montmorillonite, grinding and mixing with urea, roasting, and finally reacting with a siloxane source. According to the aging-resistant and wear-resistant rubber part prepared by the invention, the tensile strength reduction amplitude before and after thermal aging is less than 23.2%, the elongation at break reduction amplitude is less than 24.3%, and the damping performance is excellent.

Description

Technical Field

[0001] The present application relates to the technical field of wear-resistant rubber, and more specifically, to an aging-resistant and wear-resistant rubber part and a preparation process thereof. Background Art

[0002] In modern industry and construction, metal structures are easily damaged by fatigue due to dynamic loads such as external vibration and impact, which shortens their service life and even causes safety hazards. Rubber parts have become an indispensable key material for metal shock absorption and earthquake resistance due to their unique elasticity and damping properties.

[0003] The raw materials of rubber parts are mainly divided into two categories: natural rubber and synthetic rubber. Synthetic rubber includes many types such as styrene-butadiene rubber, butadiene rubber, isoprene rubber, etc. Among them, the molecular structure of isoprene rubber is similar to that of natural rubber, which makes it have the characteristics of both natural rubber and synthetic rubber and has high application value. However, in actual use, isoprene rubber also has certain defects. Because the elasticity of isoprene rubber is too strong, when the rubber body is subjected to vibration shock, most of the energy absorbed by isoprene rubber is stored and released in the form of elastic potential energy, and only a small amount of energy is released in the form of friction internal friction, making it difficult for isoprene rubber to fully exert its shock-absorbing effect. Therefore, in order to improve the shock-absorbing performance of isoprene rubber, it is necessary to add auxiliary ingredients in the rubber preparation process, but the addition of auxiliary ingredients will lead to a certain degree of reduction in the tensile properties of rubber products.

[0004] A Chinese patent application document with application publication number CN115594894A discloses a rubber composition for commercial vehicle shock-absorbing products. In the scheme, natural rubber, isoprene rubber and a butadiene-isoprene copolymer rubber composition are mixed and then treated with fillers such as carbon black to finally prepare a rubber composition. The rubber composition has high mechanical and damping properties.

[0005] In the above documents, the damping performance of pure isoprene rubber is improved by blending isoprene rubber with other polymers and utilizing the reinforcement effect of polymers, but there are still certain problems. In particular, when the polymer is unevenly dispersed, the tensile properties of the rubber product will decrease, and due to the difference in the damping temperature range of each mixed polymer component and isoprene rubber, the overall damping of the rubber product may not be fully exerted, resulting in performance redundancy; therefore, it is necessary to find an aging-resistant and wear-resistant rubber part that improves the damping performance of isoprene rubber and optimizes the tensile properties. Summary of the invention

[0006] In order to further improve the damping performance of isoprene rubber and optimize its tensile properties, the present application provides an aging-resistant and wear-resistant rubber part and a preparation process thereof.

[0007] In a first aspect, the present application provides a preparation process for an anti-aging and wear-resistant rubber part, which is prepared by mixing raw materials including the following parts by mass: 48-60 parts of isoprene rubber, 5-8 parts of a composite modification component, 3-5 parts of white carbon black, 1-2 parts of an antioxidant, and 1-1.2 parts of maleic anhydride. The preparation steps are as follows: Take isoprene rubber, pre-plasticize it by heating, add maleic anhydride, conduct an initiation treatment, then lower the temperature, add additional isoprene rubber, add the composite modification component, white carbon black, and antioxidant to the system, conduct a mixing treatment, and then cool it after molding under pressure to obtain the product; Among them, the composite modification component is obtained by subjecting montmorillonite to alkali etching, zinc salt impregnation treatment, then grinding and mixing it with urea and roasting it, and finally reacting it with a siloxane source; The mass ratio of isoprene rubber to maleic anhydride added in the initiation treatment is (40-50):(5-6); The additional isoprene rubber is added to the system in an amount 5 times that of the original isoprene rubber added.

[0008] By adopting the above technical solution, through the melt initiation treatment of maleic anhydride, a multi-carbonyl structure can be introduced onto the pre-plasticized isoprene rubber. Through the interaction between the carbonyl position and the double bond position of the isoprene rubber, the entanglement between components is enhanced, and the tensile properties of the isoprene rubber are improved; at the same time, the carbonyl can also interact with the composite modification component, increasing the sliding resistance of the rubber molecular chains when subjected to external forces and improving the damping property. In the composite modification component, montmorillonite undergoes alkali etching treatment, which can increase the roughness of its lamellar structure. After subsequent roasting and delamination, it is mixed with isoprene rubber. The delaminated montmorillonite is dispersed between the rubber molecular chain segments through mechanical action; when the rubber molecular chains slide under external forces, they can form a friction pair with the adjacent montmorillonite lamellar structures, inhibiting the behavior of the rapid release of the rubber elastic potential energy caused by molecular movement macroscopically, and finally achieving the effect of increasing damping; further impregnating and roasting it with a zinc salt, zinc oxide is loaded on the montmorillonite, and zinc oxide can form a weak coordination bond with the carbonyl part of maleic anhydride. This weak bond interaction can enhance the energy proportion of the release of the rubber non-elastic potential energy in the form of bond breaking, thereby increasing the frictional internal dissipation. Finally, after treatment with a siloxane source, the damping of the isoprene rubber is further increased and the overall tensile properties are improved.

[0009] Preferably, the preparation steps of the composite modification component are as follows: [S01] Take zinc chloride, dissolve it, conduct a heating treatment, then dropwise add an alkali solution, precipitate and then complex and dissolve it, then conduct a static treatment, then add alkali-etched montmorillonite and a promoter, conduct a stirring treatment and then let it stand overnight, take the bottom precipitate, dry it and mix it with urea, grind, roast and then cool and sieve it to obtain modified montmorillonite; [S02] Take the modified montmorillonite, disperse it with a mixed solvent, then add citric acid, then add a siloxane source, conduct a heating and stirring treatment, conduct rotary evaporation and then alcohol washing, and dry it to obtain the composite modification component; The mass ratio of the zinc chloride, the alkali-etched montmorillonite and the urea is (1 - 1.2):(7.5 - 8.3):(4 - 5); The promoter is cetyltrimethylammonium bromide; The mixed solvent is obtained by mixing acetone and water according to a volume ratio of (3 - 4):1.

[0010] By adopting the above technical solution, zinc ions in the zinc chloride precipitate in an alkaline environment, and then complex and dissolve to obtain a negatively charged ligand ion Zn(OH)4 2- , and under the action of the promoter cetyltrimethylammonium bromide, it is more likely to enter the interlayer of the alkali-etched montmorillonite through ion exchange and form a stable structure with the montmorillonite layer board; in the subsequent calcination process, Zn(OH)4 2- can decompose on the montmorillonite layer board structure to form micro-nano zinc oxide supported; the alkali-etched montmorillonite after impregnation treatment with zinc salt is further ground and mixed with urea, and small urea molecules can enter the interlayer of the montmorillonite through mechanical action and decompose into ammonia gas in the subsequent calcination treatment stage, promoting the peeling of the montmorillonite layer structure to obtain a modified montmorillonite with a peeled structure; finally, the modified montmorillonite reacts with the siloxane source in a heating environment, and the silanol groups formed by the hydrolysis of the silyl ester groups react with the surface hydroxyl groups of the montmorillonite to form a strong covalent bond, thereby grafting long alkyl chains on the modified montmorillonite to enhance the physical entanglement effect of the montmorillonite on the isoprene rubber molecular chain segments during use.

[0011] Preferably, in the step [S01], the preparation steps of the alkali-etched montmorillonite are as follows: take calcium-based montmorillonite, disperse it, add mixed alkali for treatment, then adjust the pH, take the precipitate after centrifugation and wash it, and dry it to obtain the alkali-etched montmorillonite; The mixed alkali is obtained by mixing sodium hydroxide with a concentration of 0.2 - 0.5 mol / L, tetramethylammonium hydroxide, and aminotrimethylenephosphonic acid according to a mass-volume ratio of (10 - 15) ml:(0.5 - 0.6) g:(0.1 - 0.2) ml; The conditions for the mixed alkali treatment are: adjust the temperature to 70 - 85 °C, the magnetic stirring speed is 200 - 300 rpm, and the treatment time is 3 - 4 h.

[0012] By adopting the above technical solution, the use of mixed alkali can enhance the alkali-etching treatment effect on calcium-based montmorillonite. Among them, tetramethylammonium hydroxide can buffer the strong alkali effect of sodium hydroxide, avoid over-alkali etching of calcium-based montmorillonite, and at the same time, tetramethylammonium hydroxide can also enter the interlayer of calcium-based montmorillonite through intercalation, promoting the action of the mixed alkali on the montmorillonite interlayer; aminotrimethylenephosphonic acid can react with Ca 2+ and Mg 2+Bind with metal ions such as

[0013] Preferably, in the step [S01], the calcination includes a first-stage temperature rise and a second-stage temperature rise, and the operation is as follows: First-stage temperature rise: Slowly raise the system temperature to 275 - 300 °C at a rate of 5 - 8.5 °C / min and maintain for 1 - 2 h; Second-stage temperature rise: Continue to raise the temperature to 450 - 550 °C at a rate of 3.5 - 4 °C / min and maintain for 4 - 6 h.

[0014] By adopting the above technical solution, the two-stage temperature rise during the calcination process can promote the delamination and loading to be complete. During the first-stage temperature rise, the small molecule urea inserted between the montmorillonite layers decomposes to generate ammonia gas, prompting the delamination of the montmorillonite layer structure; during the second-stage temperature rise, the thermal burning prompts the decomposition of Zn(OH)4 2- The zinc oxide generated by decomposition crystallizes between or on the surface of the montmorillonite layers to form zinc oxide particles at the micro-nano scale, thereby achieving effective loading of zinc oxide.

[0015] Preferably, in the step [S02], the siloxane source is: R-Si(OCH3)3, where R is a saturated alkyl group with 12 - 18 carbon atoms; The mass-volume ratio of the modified montmorillonite to the siloxane source is (8 - 10) g : (2 - 2.3) ml.

[0016] By adopting the above technical solution, the montmorillonite is modified and combined with the organic acid small molecule citric acid, so that more active silanol groups are excited on the montmorillonite layer board. After mixing with the siloxane source, alkyl branched chains are introduced on the layer board through the silanol condensation reaction; after the modified montmorillonite modified with the siloxane source is mixed into the rubber, on the one hand, it can enhance the frictional effect on the rubber molecular chains, thereby enhancing the energy dissipation ability of the rubber part product under external force; at the same time, the introduction of alkyl branched chains improves the compatibility between the montmorillonite and the rubber matrix, avoids agglomeration behavior, and reduces the influence of the introduction of montmorillonite on the tensile strength performance of the rubber part.

[0017] On the second hand, the present application prepares an aging-resistant and wear-resistant rubber part through the above preparation process.

[0018] To sum up, the present application has the following beneficial effects: 1. This application uses maleic anhydride and isoprene rubber for mixed initiation treatment to introduce a multi-carbonyl structure onto the isoprene rubber molecules, and then combines with a composite modification component to improve the damping property of the rubber parts. In the composite modification component, montmorillonite is modified to load zinc oxide, which can form a weak bond with the rubber. The energy ratio of the energy released in the form of non-elastic potential energy of the rubber can be enhanced through bond breaking, thereby improving the damping and tensile properties of the rubber parts.

[0019] 2. In this application, alkali etching combined with branching treatment is preferably used to increase the surface roughness of the montmorillonite laminar structure and reduce the agglomeration risk of montmorillonite in the rubber. The alkali etching treatment causes the metal cations on the montmorillonite laminar plates to dissolve and defects to occur, promoting the roughening of the laminar surface. The introduction of alkyl branched chains can improve the compatibility between montmorillonite and rubber molecular chains and promote the effective dispersion of montmorillonite among rubber molecules.

[0020] 3. The aging-resistant and wear-resistant rubber parts prepared using the composite modification component of this application have a reduction in tensile strength of less than 23.2% before and after heat aging, and a reduction in elongation at break of less than 24.3%. The damping performance of the rubber part products is excellent. Description of the Drawings

[0021] Figure 1 It is the tanδ - temperature curve of each aging-resistant and wear-resistant rubber part in Example 2 and Comparative Examples 1 - 3 of this application. Detailed Description of the Invention

[0022] The chemical compositions of the calcium-based montmorillonite used in Examples 1 - 3 and Comparative Examples 1 - 3 are shown in Table 1.

[0023] Table 1 Chemical Compositions of Calcium-Based Montmorillonite

[0024] Preparation Example 1 Take 10 g of calcium-based montmorillonite, add deionized water at a water-to-material ratio of 1:5, stir for 30 min to prepare a suspension, then add 30 ml of mixed alkali, adjust the temperature to 70 °C, the magnetic stirring speed is 200 rpm, treat for 3 h, then adjust the pH of the system to 7, centrifuge at a speed of 3000 rpm for 10 min, take the bottom precipitate, wash it twice with absolute ethanol, and then dry it overnight in an oven at 50 °C to obtain alkali-etched montmorillonite.

[0025] Take 1 g of zinc chloride, add 50 ml of deionized water, stir for 3 min to dissolve, then raise the system temperature to 50 °C, adjust the magnetic stirring speed to 100 rpm, add a 0.5 mol / L sodium hydroxide solution to the system at a rate of 5 ml / min. After white precipitate appears, reduce the rate to 2 ml / min. Continue to add dropwise until the precipitate is completely dissolved, then stop adding the sodium hydroxide solution. Then let it stand for 4 h. Add 7.5 g of alkali-etched montmorillonite and 0.5 g of cetyltrimethylammonium bromide to the system, adjust the magnetic stirring speed to 200 rpm, treat for 3 h. After standing overnight at room temperature, take the precipitate part, dry it in a ventilated oven at 45 °C for 1 h, then mix it with 4 g of urea, grind for 20 min and place it in a tubular furnace. Slowly raise the system temperature to 275 °C at a rate of 5 °C / min and maintain for 1 h. Subsequently, continue to raise the system temperature to 450 °C at a rate of 3.5 °C / min and keep it at a constant temperature for 4 h. Then stop heating and let it cool naturally overnight. Finally, grind it through a 200-mesh sieve to obtain modified montmorillonite.

[0026] Among them, the mixed alkali is obtained by mixing sodium hydroxide with a concentration of 0.2 mol / L, tetramethylammonium hydroxide, and aminotrimethylenephosphonic acid in a mass-volume ratio of 10 ml:0.5 g:0.1 ml.

[0027] Preparation Example 2 The difference between this preparation example and Preparation Example 1 is only that the preparation steps of the modified montmorillonite are as follows: Take 1.2 g of zinc chloride, add 50 ml of deionized water, stir for 5 min to dissolve, then raise the system temperature to 65 °C, adjust the magnetic stirring speed to 150 rpm, add a 0.5 mol / L sodium hydroxide solution to the system at a rate of 6.5 ml / min. After white precipitate appears, reduce the rate to 2.5 ml / min. Continue to add dropwise until the precipitate is completely dissolved, then stop adding the sodium hydroxide solution. Then let it stand for 6 h. Add 8.3 g of alkali-etched montmorillonite and 0.5 g of cetyltrimethylammonium bromide to the system, adjust the magnetic stirring speed to 300 rpm, treat for 4 h. After standing overnight at room temperature, take the precipitate part, dry it in a ventilated oven at 45 °C for 2 h, then mix it with 5 g of urea, grind for 30 min and place it in a tubular furnace. Slowly raise the system temperature to 300 °C at a rate of 8.5 °C / min and maintain for 2 h. Subsequently, continue to raise the system temperature to 550 °C at a rate of 4 °C / min and keep it at a constant temperature for 6 h. Then stop heating and let it cool naturally overnight. Finally, grind it through a 200-mesh sieve to obtain modified montmorillonite.

[0028] All the other steps are the same as those in Preparation Example 1.

[0029] Preparation Example 3 The difference between this preparation example and Preparation Example 1 is only that the preparation steps of the alkali-etched montmorillonite are as follows: Take 10 g of calcium-based montmorillonite, add deionized water at a water-to-material ratio of 1:10, stir for 30 min to prepare a suspension, then add 30 ml of mixed alkali, adjust the temperature to 85 °C, the magnetic stirring speed is 300 rpm, treat for 4 h, then adjust the pH of the system to 7.2, centrifuge at a speed of 4000 rpm for 30 min, take the bottom precipitate, wash it 3 times with anhydrous ethanol, and then dry it overnight in an oven at 60 °C to obtain alkali-etched montmorillonite.

[0030] Among them, the mixed alkali is obtained by mixing sodium hydroxide with a concentration of 0.5 mol / L, tetramethylammonium hydroxide, and aminotrimethylenephosphonic acid in a mass-to-volume ratio of 15 ml:0.6 g:0.2 ml.

[0031] All the other steps are the same as those in Preparation Example 1.

[0032] Example 1 In this example, the preparation steps of the aging-resistant and wear-resistant rubber parts are as follows: Take 80 g of isoprene rubber, add it to a screw extruder, adjust the screw rotation speed to 40 rpm, the temperature to 145 °C, treat for 30 min, then add 10 g of maleic anhydride, 1 g of dicumyl peroxide, and 0.3 g of N,N-dimethylformamide, continue to treat for 10 min, then lower the system temperature to 105 °C, add 400 g of isoprene rubber to the system, then add 50 g of the composite modification component, 30 g of white carbon black, and 10 g of antioxidant 4020, and carry out mixing treatment for 2 h to obtain a mixed rubber. Then transfer the mixed rubber to a flat vulcanizer, set the pressure to 10 MPa, the temperature to 135 °C, carry out molding treatment for 10 min, and then cool overnight to obtain the aging-resistant and wear-resistant rubber parts.

[0033] The preparation steps of the composite modification component are as follows: Take 8 g of modified montmorillonite, add 50 ml of mixed solvent, then add 0.2 g of citric acid, adjust the magnetic stirring speed to 100 rpm, disperse for 5 min, then add 2 ml of dodecyltrimethoxysilane, adjust the temperature to 45 °C, stir and treat for 2 h, then carry out rotary evaporation at 50 °C for 3 h, and then wash it 2 times with anhydrous ethanol and dry it to obtain the composite modification component.

[0034] In this example, the modified montmorillonite is prepared from Preparation Example 1.

[0035] Among them, the isoprene rubber (TL-TR80) is provided by Dongguan Sanbu Trading Co., Ltd. The mixed solvent is obtained by mixing acetone and water in a volume ratio of 3:1.

[0036] Example 2 In this example, the preparation steps of the aging-resistant and wear-resistant rubber parts are as follows: Take 85 g of isoprene rubber, add it to a screw extruder, adjust the screw rotation speed to 50 rpm, the temperature to 150 °C, and process for 30 min. Then add 12 g of maleic anhydride, 1.2 g of dicumyl peroxide, and 0.3 g of N,N-dimethylformamide, and continue to process for 10 min. After that, lower the system temperature to 105 °C, add 425 g of isoprene rubber to the system, then add 60 g of the composite modification component, 30 g of silica, and 10 g of antioxidant 4020, and carry out mixing and processing for 2 h to obtain a mixed rubber. Then transfer the mixed rubber to a flat vulcanizer, set the pressure to 10 MPa, the temperature to 140 °C, and carry out molding and processing for 10 min. Then cool overnight to obtain an aging-resistant and wear-resistant rubber part.

[0037] The preparation steps of the composite modification component are specifically as follows: Take 9 g of modified montmorillonite, add 50 ml of a mixed solvent, then add 0.25 g of citric acid, adjust the magnetic stirring speed to 100 rpm, disperse for 8 min, then add 2.3 ml of cetyltrimethoxysilane, adjust the temperature to 45 °C, and carry out stirring treatment for 2 h. Then carry out rotary evaporation at 45 °C for 3 h, and then wash with anhydrous ethanol 3 times and dry to obtain the composite modification component.

[0038] In this example, the modified montmorillonite is prepared by Preparation Example 2.

[0039] Among them, the isoprene rubber (TL-TR80) is provided by Dongguan Sanbu Trading Co., Ltd. The mixed solvent is obtained by mixing acetone and water in a volume ratio of 4:1.

[0040] Example 3 In this example, the preparation steps of the aging-resistant and wear-resistant rubber part are specifically as follows: Take 100 g of isoprene rubber, add it to a screw extruder, adjust the screw rotation speed to 50 rpm, the temperature to 160 °C, and process for 45 min. Then add 10 g of maleic anhydride, 1.5 g of dicumyl peroxide, and 0.5 g of N,N-dimethylformamide, and continue to process for 20 min. After that, lower the system temperature to 115 °C, add 500 g of isoprene rubber to the system, then add 80 g of the composite modification component, 50 g of silica, and 20 g of antioxidant 4020, and carry out mixing and processing for 3 h to obtain a mixed rubber. Then transfer the mixed rubber to a flat vulcanizer, set the pressure to 12 MPa, the temperature to 150 °C, and carry out molding and processing for 20 min. Then cool overnight to obtain an aging-resistant and wear-resistant rubber part.

[0041] The preparation steps of the composite modification component are specifically as follows: Take 10 g of modified montmorillonite, add 50 ml of mixed solvent, then add 0.3 g of citric acid, adjust the magnetic stirring speed to 100 rpm, disperse for 10 min, then add 2.3 ml of octadecyltrimethoxysilane, adjust the temperature to 50 °C, stir for 3 h, then rotary evaporate at 45 °C for 3 h, wash with absolute ethanol 3 times and then dry to obtain the composite modified component.

[0042] In this example, the modified montmorillonite was prepared according to Preparation Example 3.

[0043] Among them, isoprene rubber (TL-TR80) was provided by Dongguan Sanbu Trading Co., Ltd. The mixed solvent was obtained by mixing acetone and water in a volume ratio of 3:1.

[0044] Comparative Example 1 The difference between this comparative example and Example 1 is only that the preparation steps of the aging-resistant and wear-resistant rubber parts are as follows: Take 150 g of isoprene rubber, add it to a screw extruder, adjust the screw rotation speed to 40 rpm, the temperature to 145 °C, and process for 30 min. Then add 5 g of maleic anhydride, 1 g of dicumyl peroxide and 0.3 g of N,N-dimethylformamide, and continue to process for 10 min. After that, lower the system temperature to 105 °C, add 600 g of isoprene rubber to the system, then add 20 g of the composite modified component, 30 g of white carbon black and 10 g of antioxidant 4020, and carry out mixing for 2 h to obtain the mixed rubber. Then transfer the mixed rubber to a flat vulcanizer, set the pressure to 10 MPa, the temperature to 135 °C, and carry out molding for 10 min. Then cool overnight to obtain the aging-resistant and wear-resistant rubber parts.

[0045] All the other steps are the same as those in Example 1.

[0046] Comparative Example 2 The difference between this comparative example and Example 1 is only that the preparation steps of the modified montmorillonite are as follows: Take 1 g of zinc chloride, add 50 ml of deionized water, stir for 3 min to dissolve. Then raise the temperature of the system by 50 °C, adjust the magnetic stirring speed to 100 rpm, and add a 0.5 mol / L sodium hydroxide solution to the system at a rate of 5 ml / min until a white precipitate is formed. Subsequently, reduce the rate to 2 ml / min and continue to add dropwise until the precipitate is completely dissolved, then stop adding the sodium hydroxide solution. Then let it stand for 4 h, add 7.5 g of montmorillonite and 0.5 g of cetyltrimethylammonium bromide to the system, adjust the magnetic stirring speed to 200 rpm, and treat for 3 h. After standing overnight at room temperature, take the precipitate part, dry it in a ventilated oven at 45 °C for 1 h, then mix it with 4 g of urea, grind it for 20 min, and place it in a tube furnace. Slowly raise the temperature of the system to 275 °C at a rate of 5 °C / min and maintain for 1 h. Subsequently, continue to raise the temperature of the system to 450 °C at a rate of 3.5 °C / min and keep it at a constant temperature for 4 h. Then stop heating and let it cool naturally overnight. Finally, grind it through a 200-mesh sieve to obtain the modified montmorillonite.

[0047] All other steps are the same as in Example 1.

[0048] Comparative Example 3 The difference between this comparative example and Example 1 is only that an equal amount of calcium-based montmorillonite is used to replace the composite modification component to prepare an aging-resistant and wear-resistant rubber part.

[0049] All other steps are the same as in Example 1.

[0050] Performance detection test 1. Tensile property test 1) Refer to the national standard GB / T528-2009 to test the tensile strength and elongation at break of each aging-resistant and wear-resistant rubber part in Examples 1-3 and Comparative Examples 1-3.

[0051] 2) Refer to the national standards GB / T528-2009 and GB / T3512-2014, place each aging-resistant and wear-resistant rubber part in Examples 1-3 and Comparative Examples 1-3 in an aging oven, set the temperature at 105 °C, and treat for 48 h; test the tensile strength and elongation at break of each aging-resistant and wear-resistant rubber part in each example and comparative example after aging treatment.

[0052] The test results of 1) and 2) are shown in Table 2.

[0053] Table 2 Tensile property test results of aging-resistant and wear-resistant rubber parts before and after thermal aging in Examples 1-3 and Comparative Examples 1-3

[0054] Analysis of Examples 1-3 and Comparative Examples 1-3 and in combination with Table 2 shows that the tensile properties of the aging-resistant and wear-resistant rubber parts before and after thermal aging in the examples are significantly better than the test results of the comparative examples; and among all the test groups, the aging-resistant and wear-resistant rubber parts of Example 2 exhibit the best tensile properties. The reduction rates of the tensile strength and elongation at break after aging are 21.9% and 22.7% respectively, and the aging tensile loss is lower than the average level of the comparative examples, indicating that the addition of the composite modification components can enhance the overall tensile and anti-aging properties of the rubber; although Comparative Example 1 also uses composite modification components, due to the too low proportion of the composite modification components used in the formula, the improvement of the overall tensile properties of the rubber parts is actually not as good as the effect of using un-alkali-etched treatment in Comparative Example 2 and pure calcium montmorillonite in Comparative Example 3.

[0055] Damping performance test The damping performance of the specimen is positively correlated with the loss factor (tanδ) value: the larger the tanδ, the more significant the phase difference of the material's response to the external force, the stronger the hysteresis effect of the conversion of mechanical energy into heat energy, and the better the energy dissipation ability. Therefore, the tanδ-temperature curve can be used to characterize the damping performance of each aging-resistant and wear-resistant rubber part.

[0056] Referring to the national standard GB / T1693-2007, a rubber analyzer was used to test the tanδ-temperature curves of the aging-resistant and wear-resistant rubber parts of Example 2 and Comparative Examples 1-3, and the test results are as Figure 1 shown.

[0057] Analysis of Example 2 and Comparative Examples 1-3 and in combination with Figure 1 shows that among the test groups, the aging-resistant and wear-resistant rubber parts of Example 2 have the highest loss factor and the widest damping temperature range; indicating that when subjected to external forces, the aging-resistant and wear-resistant rubber parts of Example 2 have stronger heat energy conversion ability and exhibit better damping performance in a temperature-changing environment. In Comparative Example 3, calcium montmorillonite was directly mixed into the rubber system to obtain rubber parts. Due to the structural characteristics of the calcium montmorillonite layer, when the rubber molecules are displaced by external forces, the calcium montmorillonite instead plays a role in lubricating the rubber molecular chains; this effect reduces the resistance of the rubber molecular movement, and the potential agglomeration problem of the calcium montmorillonite results in the poor damping performance of the prepared rubber part products.

[0058] This specific embodiment is only an explanation of the present application, and it does not limit the present application. Those skilled in the art can make modifications to this embodiment without creative contributions according to needs after reading this specification, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. A preparation process for an anti-aging and wear-resistant rubber part, characterized in that, It is prepared by mixing raw materials including the following parts by mass: 48 - 60 parts of isoprene rubber, 5 - 8 parts of a composite modification component, 3 - 5 parts of white carbon black, 1 - 2 parts of an antioxidant, and 1 - 1.2 parts of maleic anhydride. The preparation steps are as follows: Take isoprene rubber, pre - plasticize it by heating, add maleic anhydride, conduct an initiation treatment, then lower the temperature, add additional isoprene rubber, add the composite modification component, white carbon black, and antioxidant to the system, conduct a mixing treatment, and then cool it after molding under pressure to obtain the product. Among them, the composite modification component is obtained by subjecting montmorillonite to alkali etching and zinc salt impregnation treatment, then grinding and mixing it with urea and roasting it, and finally reacting it with a siloxane source.

2. The preparation process of an anti-aging and wear-resistant rubber part according to claim 1, characterized in that, In the initiation treatment, the mass ratio of the added isoprene rubber to maleic anhydride is (40 - 50):(5 - 6); the additional isoprene rubber is added to the system at 5 times the original addition amount of isoprene rubber.

3. The preparation process of an anti-aging and wear-resistant rubber part according to claim 1, characterized in that, The preparation steps of the composite modification component are as follows: [S01] Take zinc chloride, dissolve it, conduct a temperature - rising treatment, then dropwise add an alkali solution, precipitate and then complex - dissolve it, then conduct a static treatment, then add alkali - etched montmorillonite and a promoter, conduct a stirring treatment and then let it stand overnight, take the bottom precipitate, dry it and mix it with urea, grind, roast and then cool and sieve it to obtain modified montmorillonite. [S02] Take the modified montmorillonite, disperse it in a mixed solvent, add citric acid, then add a siloxane source, conduct a temperature - rising stirring treatment, conduct rotary evaporation and then alcohol - wash it, and dry it to obtain the composite modification component.

4. The preparation process of an anti-aging and wear-resistant rubber part according to claim 3, characterized in that, In the step [S01], the preparation steps of the alkali - etched montmorillonite are as follows: Take calcium - based montmorillonite, disperse it, add a mixed alkali for treatment, then adjust the pH, centrifuge and take the precipitate for washing, and dry it to obtain alkali - etched montmorillonite.

5. The preparation process of an anti-aging and wear-resistant rubber part according to claim 4, characterized in that, The mixed alkali is obtained by mixing sodium hydroxide with a concentration of 0.2 - 0.5 mol / L, tetramethylammonium hydroxide, and aminotrimethylenephosphonic acid in a mass - to - volume ratio of (10 - 15) ml:(0.5 - 0.6) g:(0.1 - 0.2) ml; the conditions for the mixed alkali treatment are: adjust the temperature to 70 - 85 °C, the magnetic stirring speed is 200 - 300 rpm, and treat for 3 - 4 h.

6. The preparation process of an anti-aging and wear-resistant rubber part according to claim 3, characterized in that, In the step [S01], the mass ratio of zinc chloride, alkali - etched montmorillonite, and urea is (1 - 1.2):(7.5 - 8.3):(4 - 5); the promoter is cetyltrimethylammonium bromide.

7. The preparation process of an anti-aging and wear-resistant rubber part according to claim 3, characterized in that, In the step [S01], the roasting includes a first - stage temperature rise and a second - stage temperature rise, and the operations are as follows: First - stage temperature rise: Slowly raise the system temperature to 275 - 300 °C at a rate of 5 - 8.5 °C / min and maintain it for 1 - 2 h. Second - stage temperature rise: Continue to raise the temperature to 450 - 550 °C at a rate of 3.5 - 4 °C / min and maintain it for 4 - 6 h.

8. The preparation process of an anti-aging and wear-resistant rubber part according to claim 3, characterized in that, In the step [S02], the mixed solvent is obtained by mixing acetone and water in a volume ratio of (3 - 4):

1.

9. The preparation process of an anti-aging and wear-resistant rubber part according to claim 3, characterized in that, In the step [S02], the siloxane source is: R - Si(OCH3)3, where R is a saturated alkyl group with 12 - 18 carbon atoms. The mass - to - volume ratio of the modified montmorillonite to the siloxane source is (8 - 10) g:(2 - 2.3) ml.

10. An anti - aging and wear - resistant rubber part prepared by the preparation process according to any one of claims 1 - 9.

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