Aging-resistant wear-resistant rubber part and preparation process thereof

Abstract

The application relates to the technical field of wear-resistant rubber, and particularly discloses an anti-aging wear-resistant rubber part and a preparation process thereof, which is prepared by mixing raw materials including the following components by mass: isoprene rubber 48-60 parts, a composite modification component 5-8 parts, white carbon black 3-5 parts, an antioxidant 1-2 parts and maleic anhydride 1-1.2 parts; the preparation steps include the following: taking isoprene rubber, adding maleic anhydride after temperature pre-plasticization, initiating treatment, then reducing the temperature, supplementing isoprene rubber, adding the composite modification component, white carbon black and the antioxidant to the system again, mixing and treating, then performing mold pressing and cooling, and the anti-aging wear-resistant rubber part is obtained; wherein the composite modification component is obtained by the following steps: alkali etching, zinc salt impregnation treatment of montmorillonite, grinding and mixing with urea, baking and finally reacting with a siloxane source. The anti-aging wear-resistant rubber part prepared by the application has a tensile strength drop of less than 23.2% before and after heat aging, a tensile elongation drop of less than 24.3%, and superior damping performance.

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 susceptible to fatigue damage due to dynamic loads such as vibration and impact, shortening their service life and even posing safety risks. Rubber components, with their unique elasticity and damping properties, have become an indispensable key material for metal vibration reduction and earthquake resistance.

[0003] The raw materials for rubber parts are mainly divided into two categories: natural rubber and synthetic rubber. Synthetic rubber includes various types such as styrene-butadiene rubber, butadiene rubber, and isoprene rubber. 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 isoprene rubber is too elastic, when the rubber body is subjected to vibration impact, most of the energy absorbed by the 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 frictional 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 during the rubber preparation process, but the addition of auxiliary ingredients will lead to a certain degree of reduction in the tensile properties of the rubber product.

[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 with high mechanical and damping properties.

[0005] The aforementioned document improves the damping performance of pure isoprene rubber by blending it with other polymers, leveraging the polymer's reinforcing properties. However, certain issues remain. In particular, uneven polymer dispersion can lead to a decrease in the rubber product's tensile properties. Furthermore, differences in the damping temperature ranges between the mixed polymer components and the isoprene rubber can result in incomplete damping performance, resulting in performance redundancy. Therefore, it is necessary to develop an aging- and wear-resistant rubber component that improves the damping performance of isoprene rubber while also optimizing its 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 process for preparing an aging-resistant and wear-resistant rubber part, which is prepared by mixing the following raw materials in parts by mass: 48-60 parts of isoprene rubber, 5-8 parts of a composite modifying 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 include the following:

[0008] Take isoprene rubber, heat it up to pre-plasticize it, then add maleic anhydride to initiate the treatment, then lower the temperature, add more isoprene rubber, add the composite modification component, white carbon black, and antioxidant to the system, mix them, and then mold and cool them to obtain the product;

[0009] The composite modified component is prepared by treating montmorillonite with alkaline etching and zinc salt impregnation, grinding and mixing with urea, calcining, and finally reacting with a siloxane source.

[0010] The mass ratio of isoprene rubber to maleic anhydride added in the initiation treatment is (40-50): (5-6);

[0011] The additional isoprene rubber is added into the system at 5 times the amount of the original isoprene rubber.

[0012] By adopting the above technical solution, after maleic anhydride melt-initiated treatment, a multi-carbonyl structure can be introduced into the pre-plasticized isoprene rubber. Through the interaction between the carbonyl position and the double bond position of the isoprene rubber, the entanglement between the components is enhanced and the tensile properties of the isoprene rubber are improved. At the same time, the carbonyl group can also interact with the composite modified component to increase the slip resistance of the rubber molecular chain when subjected to external force, thereby improving the damping properties. In the composite modified components, montmorillonite is treated with alkaline etching to increase the roughness of its layer. After subsequent baking and peeling, it is mixed with isoprene rubber. The peeled montmorillonite is dispersed between the rubber molecular segments through mechanical action. When the rubber molecular chain slips under the action of external force, it can form a friction pair with the adjacent montmorillonite layer, inhibiting the rapid release of rubber elastic potential energy caused by macroscopic molecular movement, and ultimately achieving the effect of increasing damping. After further impregnation and baking with zinc salt, zinc oxide is loaded on the montmorillonite. Zinc oxide can form a weak coordination bond with the carbonyl part of maleic anhydride. This weak bond effect can enhance the proportion of energy released in the form of rubber inelastic potential energy by breaking bonds, thereby increasing friction internal friction. Finally, it is treated with a silicone source to further increase the damping of isoprene rubber and improve the overall tensile properties.

[0013] Preferably, the preparation steps of the composite modified component include the following:

[0014] [S01] Dissolve zinc chloride, heat it, then add alkali solution dropwise, precipitate it, dissolve it by complexation, and then let it stand for a while. Then add alkaline etched montmorillonite and accelerator, stir it, and let it stand overnight. Take the bottom precipitate, dry it, mix it with urea, grind it, roast it, cool it, and sieve it to obtain modified montmorillonite.

[0015] [S02] taking modified montmorillonite, dispersing it in a mixed solvent, adding citric acid, and then adding a siloxane source, heating and stirring, washing with alcohol after rotary evaporation, and drying to obtain a composite modified component;

[0016] The mass ratio of zinc chloride, alkaline montmorillonite and urea is (1-1.2): (7.5-8.3): (4-5);

[0017] The accelerator is cetyltrimethylammonium bromide;

[0018] The mixed solvent is obtained by mixing acetone and water in a volume ratio of (3-4):1.

[0019] By adopting the above technical solution, zinc ions in zinc chloride are precipitated in an alkaline environment, and then complexed and dissolved to obtain negatively charged complex ions Zn(OH)4 2- , and under the action of the promoter hexadecyltrimethylammonium bromide, it is easier to enter the alkaline eroded montmorillonite layer through ion exchange and form a stable structure with the montmorillonite layer; in the subsequent roasting process, Zn(OH)4 2- The montmorillonite layer structure can be decomposed to form micro-nano loaded zinc oxide; the alkaline-etched montmorillonite treated with zinc salt impregnation is further ground and mixed with urea, and the small urea molecules can enter the montmorillonite layers through mechanical action and decompose into ammonia in the subsequent roasting treatment stage, thereby promoting the exfoliation of the montmorillonite layer structure to obtain a modified montmorillonite with an exfoliated structure; finally, the modified montmorillonite is reacted with a siloxane source under a rising temperature environment, and the silanol groups formed by the hydrolysis of the silyl ester group react with the hydroxyl groups on the surface of the montmorillonite to form a strong covalent bond, thereby grafting long alkyl chains on the modified montmorillonite to enhance the physical entanglement of the montmorillonite with the isoprene rubber molecular segments during use.

[0020] Preferably, in the step [S01], the preparation step of the alkaline-etched montmorillonite comprises the following steps: taking calcium-based montmorillonite, dispersing it, adding a mixed alkali for treatment, then adjusting the pH, centrifuging it, washing the precipitate, and drying it to obtain the alkaline-etched montmorillonite;

[0021] The mixed alkali is prepared by mixing sodium hydroxide, tetramethylammonium hydroxide, and aminotrimethylenephosphonic acid at a concentration of 0.2-0.5 mol / L according to a mass volume ratio of (10-15) ml: (0.5-0.6) g: (0.1-0.2) ml;

[0022] The conditions for the mixed alkali treatment are: adjusting the temperature to 70-85° C., the magnetic stirring speed to 200-300 rpm, and treating for 3-4 hours.

[0023] By adopting the above technical solution, the alkaline etching treatment effect of calcium-based montmorillonite can be enhanced by using a mixed alkali. Among them, tetramethylammonium hydroxide can buffer the strong alkaline effect of sodium hydroxide, avoiding excessive alkaline etching of calcium-based montmorillonite. At the same time, tetramethylammonium hydroxide can also enter the interlayer of calcium-based montmorillonite through intercalation, promoting the effect of the mixed alkali on the interlayer of montmorillonite; aminotrimethylenephosphonic acid can react with the Ca2+ stripped from the calcium-based montmorillonite plate during the alkaline etching process. 2+ Mg 2+ It combines with other metal ions to inhibit the precipitation of metal ions in an alkaline environment, which leads to scale inhibition. Through comprehensive effects, it enhances the roughness of the calcium-based montmorillonite layer and creates more silicon hydroxyl active sites through alkaline corrosion.

[0024] Preferably, in the step [S01], the roasting includes a first stage of heating and a second stage of heating, and the operation is as follows:

[0025] Stage 1 heating: slowly increase the system temperature to 275-300°C at a rate of 5-8.5°C / min and maintain for 1-2 hours;

[0026] Second stage heating: continue heating to 450-550℃ at a rate of 3.5-4℃ / min and maintain for 4-6h.

[0027] By adopting the above technical solution, the two-stage heating process can promote the complete stripping and loading. In the first heating process, the small molecule urea inserted between the montmorillonite plates decomposes to produce ammonia, which promotes the stripping of the montmorillonite layer structure; in the second heating process, the thermal burning promotes the Zn(OH)4 2- The zinc oxide produced by decomposition crystallizes between the layers or on the surface of the montmorillonite to form micro-nano-scale zinc oxide particles, thereby achieving effective loading of zinc oxide.

[0028] Preferably, in step [S02], the siloxane source is:

[0029] R-Si(OCH3)3, R is a saturated alkyl group with 12 to 18 carbon atoms;

[0030] The mass volume ratio of the modified montmorillonite to the siloxane source is (8-10) g: (2-2.3) ml.

[0031] By adopting the above technical solution, the montmorillonite is modified and combined with the organic acid small molecule citric acid to stimulate more active silanol sites on the montmorillonite layer. After mixing with the siloxane source, alkyl branched chains are introduced into the layer 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 friction effect on the rubber molecular chain, thereby enhancing the energy dissipation capacity of the rubber product under the action of external force; at the same time, the introduction of alkyl branched chains improves the compatibility of montmorillonite with the rubber matrix, avoids agglomeration behavior, and reduces the impact of the introduction of montmorillonite on the tensile strength performance of the rubber part.

[0032] In the second aspect, the present application prepares aging-resistant and wear-resistant rubber parts through the above-mentioned preparation process.

[0033] In summary, this application has the following beneficial effects:

[0034] 1. This application utilizes a mixed initiation treatment of maleic anhydride and isoprene rubber to introduce a polycarbonyl structure into the isoprene rubber molecule. This is then combined with a composite modification component to enhance the damping properties of rubber components. Within the composite modification component, montmorillonite is modified and loaded with zinc oxide, which forms a weak bond with the rubber. This bond scission enhances the proportion of energy released from the rubber as inelastic potential energy, improving the damping and tensile properties of the rubber component.

[0035] 2. In this application, alkaline etching combined with branching treatment is preferably used to increase the surface roughness of the montmorillonite layer structure and reduce the risk of montmorillonite agglomeration in rubber; alkaline etching treatment causes the dissolution of metal cations and the generation of defects on the montmorillonite layer, promoting the roughening of the layer surface; and the introduction of alkyl branched chains can improve the compatibility of montmorillonite and rubber molecular chains, and promote the effective dispersion of montmorillonite between rubber molecules.

[0036] 3. The aging-resistant and wear-resistant rubber parts made using the composite modified components of this application have a tensile strength drop of less than 23.2% before and after heat aging, and a drop in elongation at break of less than 24.3%. The rubber parts have excellent damping performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 The tanδ-temperature curves of the aging-resistant and wear-resistant rubber parts of Example 2 and Comparative Examples 1-3 of the present application are shown. DETAILED DESCRIPTION

[0038] The chemical compositions of the calcium-montmorillonite used in Examples 1-3 and Comparative Examples 1-3 are shown in Table 1.

[0039] Table 1 Chemical composition of calcium-montmorillonite

[0040]

[0041] Preparation Example 1

[0042] Take 10g of calcium-based montmorillonite, add deionized water at a water-to-material ratio of 1:5, stir for 30 minutes to prepare a suspension, then add 30ml of mixed alkali, adjust the temperature to 70°C, the magnetic stirring speed to 200rpm, treat for 3h, then adjust the pH of the system to 7, centrifuge at 3000rpm for 10min, take the bottom precipitate, wash it twice with anhydrous ethanol, and then dry it in an oven at 50°C overnight to obtain alkaline-etched montmorillonite.

[0043] Take 1g zinc chloride, add 50ml deionized water, stir for 3min to dissolve, then raise the system temperature to 50℃, adjust the magnetic stirring speed to 100rpm, add 0.5mol / L sodium hydroxide solution to the system at a rate of 5ml / min, reduce the speed to 2ml / min after producing a white precipitate, continue to add until the precipitate is completely dissolved, stop adding sodium hydroxide solution, and then let it stand for 4h, add 7.5g alkaline etched montmorillonite and 0.5g hexadecyltrimethylammonium bromide to the system, adjust the magnetic stirring speed to 200rpm, treat for 3h, let it stand at room temperature overnight, take the precipitate part, dry it in an oven at 45℃ for 1h, then mix it with 4g urea, grind it for 20min and place it in a tube furnace, slowly raise the system temperature to 275℃ at a rate of 5℃ / min, maintain it for 1h, then continue to raise the system temperature to 450℃ at a rate of 3.5℃ / min and keep it at a constant temperature for 4h, then stop heating, cool it naturally overnight, and finally grind it through a 200 mesh sieve to obtain modified montmorillonite.

[0044] The mixed base is prepared 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.

[0045] Preparation Example 2

[0046] The only difference between this preparation example and Preparation Example 1 is that the preparation steps of the modified montmorillonite are as follows:

[0047] Take 1.2g zinc chloride, add 50ml deionized water, stir for 5min to dissolve, then raise the system temperature to 65℃, adjust the magnetic stirring speed to 150rpm, add 0.5mol / L sodium hydroxide solution to the system at a rate of 6.5ml / min, reduce the speed to 2.5ml / min after a white precipitate is produced, continue to add until the precipitate is completely dissolved, stop adding sodium hydroxide solution, then let it stand for 6h, add 8.3g alkaline etched montmorillonite and 0.5g hexadecyltrimethylsilane to the system. Ammonium bromide, adjust the magnetic stirring speed to 300 rpm, treat for 4 hours, let it stand at room temperature overnight, take the precipitate, dry it in an oven at 45 ° C for 2 hours, then mix it with 5g of urea, grind it for 30 minutes, and place it in a tube furnace. Slowly increase the system temperature to 300 ° C at a rate of 8.5 ° C / min, maintain it for 2 hours, then continue to increase the system temperature to 550 ° C at a rate of 4 ° C / min and keep it at a constant temperature for 6 hours. After that, stop heating, cool it naturally overnight, and finally grind it through a 200 mesh sieve to obtain modified montmorillonite.

[0048] The remaining steps are the same as those in Preparation Example 1.

[0049] Preparation Example 3

[0050] The only difference between this preparation example and Preparation Example 1 is that the preparation steps of alkaline-etched montmorillonite are as follows:

[0051] Take 10g of calcium-based montmorillonite, add deionized water at a water-to-material ratio of 1:10, stir for 30 minutes to prepare a suspension, then add 30ml of mixed alkali, adjust the temperature to 85°C, the magnetic stirring speed to 300rpm, treat for 4 hours, then adjust the pH of the system to 7.2, centrifuge at 4000rpm for 30 minutes, take the bottom precipitate, wash it with anhydrous ethanol 3 times, and then dry it in an oven at 60°C overnight to obtain alkaline-etched montmorillonite.

[0052] The mixed base is prepared by mixing sodium hydroxide with a concentration of 0.5 mol / L, tetramethylammonium hydroxide, and aminotrimethylenephosphonic acid in a mass volume ratio of 15 ml:0.6 g:0.2 ml.

[0053] The remaining steps are the same as those in Preparation Example 1.

[0054] Example 1

[0055] In this embodiment, the steps for preparing the aging-resistant and wear-resistant rubber part are as follows:

[0056] Take 80g of isoprene rubber, add it to the screw extruder, adjust the screw speed to 40rpm, the temperature to 145℃, and treat for 30min. Then add 10g of maleic anhydride, 1g of diisopropylbenzene peroxide and 0.3g of N,N-dimethylformamide, and continue to treat for 10min. Then lower the system temperature to 105℃, add 400g of isoprene rubber to the system, and then add 50g of composite modified components, 30g of white carbon black and 10g of antioxidant 4020. Mix for 2h to obtain a rubber mixture. Then transfer the rubber mixture to a flat vulcanizer, set the pressure to 10MPa, the temperature to 135℃, and mold for 10min. Then cool overnight to obtain aging-resistant and wear-resistant rubber parts.

[0057] The preparation steps of the composite modified component are as follows:

[0058] Take 8g of modified montmorillonite, add 50ml of mixed solvent, then add 0.2g of citric acid, adjust the magnetic stirring speed to 100rpm, disperse for 5min, then add 2ml of dodecyltrimethoxysilane, adjust the temperature to 45℃, stir for 2h, then rotary evaporate at 50℃ for 3h, wash twice with anhydrous ethanol and dry to obtain a composite modified component.

[0059] In this embodiment, the modified montmorillonite was prepared according to Preparation Example 1.

[0060] Isoprene rubber (TL-TR80) was provided by Dongguan Sanbu Trading Co., Ltd. The mixed solvent was prepared by mixing acetone and water in a volume ratio of 3:1.

[0061] Example 2

[0062] In this embodiment, the steps for preparing the aging-resistant and wear-resistant rubber part are as follows:

[0063] Take 85g of isoprene rubber, add it to the screw extruder, adjust the screw speed to 50rpm, the temperature to 150℃, and treat for 30min. Then add 12g of maleic anhydride, 1.2g of diisopropylbenzene peroxide and 0.3g of N,N-dimethylformamide, and continue to treat for 10min. Then lower the system temperature to 105℃, add 425g of isoprene rubber to the system, and then add 60g of composite modified components, 30g of white carbon black and 10g of antioxidant 4020. Mix for 2h to obtain a rubber mixture. Then transfer the rubber mixture to a flat vulcanizer, set the pressure to 10MPa, the temperature to 140℃, and mold for 10min. Then cool overnight to obtain aging-resistant and wear-resistant rubber parts.

[0064] The preparation steps of the composite modified component are as follows:

[0065] Take 9g of modified montmorillonite, add 50ml of mixed solvent, then add 0.25g of citric acid, adjust the magnetic stirring speed to 100rpm, disperse for 8min, then add 2.3ml of hexadecyltrimethoxysilane, adjust the temperature to 45℃, stir for 2h, then rotary evaporate at 45℃ for 3h, wash with anhydrous ethanol 3 times and dry to obtain a composite modified component.

[0066] In this embodiment, the modified montmorillonite was prepared according to Preparation Example 2.

[0067] Isoprene rubber (TL-TR80) was provided by Dongguan Sanbu Trading Co., Ltd. The mixed solvent was prepared by mixing acetone and water in a volume ratio of 4:1.

[0068] Example 3

[0069] In this embodiment, the steps for preparing the aging-resistant and wear-resistant rubber part are as follows:

[0070] Take 100g of isoprene rubber, add it to the screw extruder, adjust the screw speed to 50rpm, the temperature to 160℃, and treat for 45min. Then add 10g of maleic anhydride, 1.5g of diisopropylbenzene peroxide and 0.5g of N,N-dimethylformamide, and continue to treat for 20min. Then lower the system temperature to 115℃, add 500g of isoprene rubber to the system, and then add 80g of composite modified components, 50g of white carbon black and 20g of antioxidant 4020. Mix for 3h to obtain a rubber mixture. Then transfer the rubber mixture to a flat vulcanizer, set the pressure to 12MPa, the temperature to 150℃, and mold for 20min. Then cool overnight to obtain aging-resistant and wear-resistant rubber parts.

[0071] The preparation steps of the composite modified component are as follows:

[0072] Take 10g of modified montmorillonite, add 50ml of mixed solvent, then add 0.3g of citric acid, adjust the magnetic stirring speed to 100rpm, disperse for 10min, then add 2.3ml of octadecyltrimethoxysilane, adjust the temperature to 50℃, stir for 3h, then rotary evaporate at 45℃ for 3h, then wash with anhydrous ethanol 3 times and dry to obtain a composite modified component.

[0073] In this example, the modified montmorillonite was prepared according to Preparation Example 3.

[0074] Isoprene rubber (TL-TR80) was provided by Dongguan Sanbu Trading Co., Ltd. The mixed solvent was prepared by mixing acetone and water in a volume ratio of 3:1.

[0075] Comparative Example 1

[0076] The only difference between this comparative example and Example 1 is that the steps for preparing the aging-resistant and wear-resistant rubber part are as follows:

[0077] Take 150g of isoprene rubber, add it to the screw extruder, adjust the screw speed to 40rpm, the temperature to 145℃, and treat for 30min. Then add 5g of maleic anhydride, 1g of diisopropylbenzene peroxide and 0.3g of N,N-dimethylformamide, and continue to treat for 10min. Then lower the system temperature to 105℃, add 600g of isoprene rubber to the system, and then add 20g of composite modified components, 30g of white carbon black and 10g of antioxidant 4020. Mix for 2h to obtain a rubber mixture. Then transfer the rubber mixture to a flat vulcanizer, set the pressure to 10MPa, the temperature to 135℃, and mold for 10min. Then cool overnight to obtain aging-resistant and wear-resistant rubber parts.

[0078] The remaining steps are the same as those in Example 1.

[0079] Comparative Example 2

[0080] The only difference between this comparative example and Example 1 is that the preparation steps of the modified montmorillonite are as follows:

[0081] Take 1g zinc chloride, add 50ml deionized water, stir for 3min to dissolve, then raise the system temperature to 50℃, adjust the magnetic stirring speed to 100rpm, add 0.5mol / L sodium hydroxide solution to the system at a rate of 5ml / min until a white precipitate is produced, then reduce the speed to 2ml / min, continue to add until the precipitate is completely dissolved, stop adding sodium hydroxide solution, and then let it stand for 4h, add 7.5g montmorillonite and 0.5g hexadecyltrimethylammonium bromide to the system, adjust the magnetic stirring speed to 200rpm, treat for 3h, let it stand at room temperature overnight, take the precipitate part, dry it in an oven at 45℃ for 1h, then mix it with 4g urea, grind it for 20min and place it in a tube furnace, slowly raise the system temperature to 275℃ at a rate of 5℃ / min, maintain it for 1h, then continue to raise the system temperature to 450℃ at a rate of 3.5℃ / min and keep it at a constant temperature for 4h, then stop heating, cool it naturally overnight, and finally grind it through a 200 mesh sieve to obtain modified montmorillonite.

[0082] The remaining steps are the same as those in Example 1.

[0083] Comparative Example 3

[0084] The only difference between this comparative example and Example 1 is that an equal amount of calcium-based montmorillonite is used instead of the composite modified component to prepare an aging-resistant and wear-resistant rubber part.

[0085] The remaining steps are the same as those in Example 1.

[0086] Performance testing

[0087] 1. Tensile properties test

[0088] 1) With reference to the national standard GB / T528-2009, the tensile strength and elongation at break of the aging-resistant and wear-resistant rubber parts of Examples 1-3 and Comparative Examples 1-3 were tested.

[0089] 2) Referring to the national standards GB / T528-2009 and GB / T3512-2014, the aging-resistant and wear-resistant rubber parts of Examples 1-3 and Comparative Examples 1-3 were placed in an aging chamber at 105°C for 48 hours. The tensile strength and elongation at break of the aging-resistant and wear-resistant rubber parts of Examples and Comparative Examples after aging were tested.

[0090] The test results of 1) and 2) are shown in Table 2.

[0091] Table 2 Test results of tensile properties of aging-resistant and wear-resistant rubber parts of Examples 1-3 and Comparative Examples 1-3 before and after thermal aging

[0092]

[0093] Analysis of Examples 1-3 and Comparative Examples 1-3 and combined with Table 2 shows that the tensile properties of the aging-resistant and wear-resistant rubber parts of the examples before and after thermal aging are significantly better than the test results of the comparative examples; and among all test groups, the aging-resistant and wear-resistant rubber parts of Example 2 have the best tensile properties, with the tensile strength and elongation at break decreasing by 21.9% and 22.7% after aging, respectively, and the aging tensile loss is lower than the average level of the comparative examples, indicating that the addition of the composite modified component can enhance the overall tensile and aging resistance of the rubber; although Comparative Example 1 also uses a composite modified component, due to the low proportion of the composite modified component in the formula, the improvement in the overall tensile properties of the rubber part is not as good as the effect of the use of the untreated alkaline-etched rubber in Comparative Example 2 and the pure calcium-based montmorillonite in Comparative Example 3.

[0094] Damping performance test

[0095] The damping performance of the sample 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 external force, the stronger the hysteresis effect of converting mechanical energy into thermal energy, and the better the energy dissipation capacity. Therefore, the tanδ-temperature curve can be used to characterize the damping performance of various aging-resistant and wear-resistant rubber parts.

[0096] Referring to the national standard GB / T1693-2007, the tanδ-temperature curves of the aging-resistant and wear-resistant rubber parts of Example 2 and Comparative Examples 1-3 were tested using a rubber analyzer. The test results are as follows: Figure 1 shown.

[0097] Analyze Example 2 and Comparative Examples 1-3 and combine Figure 1It can be seen that the aging-resistant and wear-resistant rubber component of Example 2 has the highest loss factor and the widest damping temperature range among the test groups. This indicates that when subjected to external forces, the aging-resistant and wear-resistant rubber of Example 2 has a stronger ability to convert heat energy and exhibits superior damping performance in temperature-varying environments. In contrast, the rubber component of Comparative Example 3, which directly incorporates calcium-montmorillonite into the rubber system, is produced. Due to the structural characteristics of the calcium-montmorillonite layer, when the rubber molecules are displaced by external forces, the calcium-montmorillonite acts as a lubricant for the rubber chains. This effect reduces the resistance to movement of the rubber molecules. However, the potential agglomeration of the calcium-montmorillonite results in suboptimal damping performance in the resulting rubber component.

[0098] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A process for preparing an aging-resistant and wear-resistant rubber part, characterized in that: The product is prepared by mixing the following raw materials in parts by mass: 48-60 parts of isoprene rubber, 5-8 parts of composite modification component, 3-5 parts of white carbon black, 1-2 parts of antioxidant, and 1-1.2 parts of maleic anhydride. The preparation steps include the following: Take isoprene rubber, heat it up to pre-plasticize it, then add maleic anhydride to initiate the treatment, then lower the temperature, add more isoprene rubber, add the composite modification component, white carbon black, and antioxidant to the system, mix them, and then mold and cool them to obtain the product; The steps for preparing the composite modified component include the following: [S01] Dissolve zinc chloride, heat it, then add alkali solution dropwise, precipitate it, dissolve it by complexation, and then let it stand for a while. Then add alkaline etched montmorillonite and accelerator, stir it, and let it stand overnight. Take the bottom precipitate, dry it, mix it with urea, grind it, roast it, cool it, and sieve it to obtain modified montmorillonite. [S02] taking modified montmorillonite, dispersing it in a mixed solvent, adding citric acid, and then adding a siloxane source, heating and stirring, washing with alcohol after rotary evaporation, and drying to obtain a composite modified component; In the step [S01], the preparation step of the alkaline-etched montmorillonite comprises the following steps: taking calcium-based montmorillonite, dispersing it, adding a mixed alkali for treatment, then adjusting the pH, centrifuging it, washing it, and drying it to obtain the alkaline-etched montmorillonite; The mixed alkali is obtained by mixing 0.2-0.5 mol / L sodium hydroxide, tetramethylammonium hydroxide and aminotrimethylenephosphonic acid.

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

3. The process for preparing an aging-resistant and wear-resistant rubber part according to claim 1, characterized in that: The mixed alkali is prepared 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) g. The mixed alkali treatment conditions are: adjusting the temperature to 70-85°C, the magnetic stirring speed to 200-300 rpm, and the treatment for 3-4 hours.

4. The process for preparing an aging-resistant and wear-resistant rubber part according to claim 1, characterized in that: In the step [S01], the mass ratio of zinc chloride, alkaline-etched montmorillonite and urea is (1-1.2): (7.5-8.3): (4-5); and the accelerator is hexadecyltrimethylammonium bromide.

5. The process for preparing an aging-resistant and wear-resistant rubber part according to claim 1, characterized in that: In the step [S01], the roasting includes a first stage of heating and a second stage of heating, and the operation is as follows: Stage 1 heating: slowly increase the system temperature to 275-300°C at a rate of 5-8.5°C / min and maintain for 1-2 hours; Second stage heating: continue heating to 450-550℃ at a rate of 3.5-4℃ / min and maintain for 4-6h.

6. The process for preparing an aging-resistant and wear-resistant rubber part according to claim 1, 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.

7. The process for preparing an aging-resistant and wear-resistant rubber part according to claim 1, characterized in that: In the step [S02], the siloxane source is: R-Si(OCH3)3, where R is a saturated alkyl group with 12 to 18 carbon atoms; The mass volume ratio of the modified montmorillonite to the siloxane source is (8-10) g: (2-2.3) ml.

8. An aging-resistant and wear-resistant rubber part produced by the preparation process according to any one of claims 1 to 7.

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