High-wear-resistance automobile rubber sealing element and preparation method thereof

Abstract

The invention relates to the technical field of high polymer materials, and discloses a high-wear-resistance automobile rubber sealing element and a preparation method thereof, and the core of the high-wear-resistance automobile rubber sealing element is a rubber composition: ethylene propylene diene monomer is used as a matrix, and a double-network structure is constructed through interpenetration of a permanent vulcanization network and a dynamic reversible chemical network. The dynamic reversible network is formed by maleimide functionalized ethylene propylene diene monomer rubber and furfuryl anchored nano silicon dioxide through reversible chemical bonds. A two-dimensional nanosheet inner lubricant is further synergistically compounded in the composition to reduce frictional wear, and a force-heat conversion molecular friction body is used for promoting damage repair caused by local heat. According to the preparation method, a double-screw extruder is adopted for continuously preparing the functionalized polymer, and after multi-stage mixing, the functionalized polymer is formed through a continuous extrusion microwave vulcanization process. The prepared sealing element has excellent wear resistance and efficient self-repairing capacity, the service life is remarkably prolonged, and the preparation process is continuous and efficient.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high polymer materials, in particular to a high-wear-resistance automobile rubber sealing element and a preparation method thereof. BACKGROUND

[0002] The automobile rubber sealing element is a key functional component for ensuring the air tightness, water tightness, sound insulation and vibration reduction of the vehicle body, and its long-term service performance is crucial. At present, ethylene-propylene-diene rubber (EPDM) is the mainstream base material for manufacturing such sealing elements due to its excellent weather resistance, heat aging resistance and ozone resistance. In order to improve its mechanical properties to meet the use requirements, carbon black or silica and other reinforcing fillers are usually added to the EPDM matrix.

[0003] However, the rubber sealing element in the prior art still has inherent technical defects. In the actual use environment, the sealing element is in reciprocating friction with the vehicle door, vehicle window glass and other components for a long time, and this continuous mechanical action can cause material surface wear and generate powder, ultimately reducing the sealing performance and shortening the effective service life. Traditional inorganic fillers such as silica have poor compatibility between the polar and non-polar EPDM matrix, resulting in uneven dispersion of the fillers and weak interfacial bonding. This poor interfacial state not only limits the improvement of wear resistance, but also can become a stress concentration point, accelerating the fatigue and wear of the material under dynamic stress.

[0004] More importantly, the crosslinking network of traditional vulcanized rubber is composed of stable covalent bonds, and this chemical structure makes the material irreversible once it is physically damaged, such as scratching or tearing. The damage cannot be self-healed and can only be solved by replacing the entire sealing element, which increases the maintenance cost and resource consumption of the vehicle. There is an inherent technical contradiction between improving the mechanical properties such as strength and wear resistance of the rubber material and endowing it with damage self-repairing ability. The stable crosslinking network constructed for high mechanical strength and wear resistance actually hinders the recombination and movement of molecular chains, thereby inhibiting any form of damage repair. Although there have been some studies on repairable high polymer materials, these materials often achieve reversible repair by introducing dynamic chemical bonds, which usually comes at the cost of the mechanical strength and dimensional stability of the material, making it difficult to meet the stringent requirements of automobile sealing elements under high load and high friction conditions. Therefore, developing a rubber material that has high wear resistance and damage self-repairing ability and can be prepared by an efficient process is a technical problem to be solved in the field. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application provides a high-wear-resistance automobile rubber sealing element and a preparation method thereof, which solves the problem that the rubber sealing element in the prior art is usually difficult to maintain high mechanical strength and wear resistance while endowing the material with the ability to self-repair after damage.

[0006] To solve the above technical problems, the present application provides the following technical solutions: The present application provides a high-wear-resistant automobile rubber sealing element.

[0007] The sealing element is made of a specific rubber composition. The rubber composition comprises the following raw materials by weight: 100 parts of maleimide functionalized ethylene-propylene-diene rubber, 20-40 parts of furfuryl anchored nanosilica, 0.5-1.5 parts of two-dimensional nanosheet internal lubricant, 0.1-0.5 parts of force-heat conversion molecular friction body, 5-11 parts of permanent crosslinking system, 5-15 parts of naphthenic oil, and 1-2 parts of antioxidant.

[0008] In the present technical solution, the mechanism of each component is as follows: Construction of double network structure: the base structure of the sealing element is formed by the interpenetration of two different chemical networks.

[0009] The first is an irreversible permanent vulcanization network formed by the permanent crosslinking system during the vulcanization process, which provides the sealing element with a stable macrostructure, basic mechanical strength, and elastic recovery performance.

[0010] The second is a dynamic reversible network formed by the Diels-Alder reaction between maleimide functionalized ethylene-propylene-diene rubber and furfuryl anchored nanosilica.

[0011] Maleimide groups and furfuryl groups can form covalent bonds under heating conditions, and the bond can reversibly break down under higher temperatures or stress conditions. This reversible dynamic network gives the sealing element the ability to self-repair after minor damage.

[0012] Synergistic effect of the repair process: two-dimensional nanosheet internal lubricant and force-heat conversion molecular friction body synergistically act to promote the repair process.

[0013] When the surface of the sealing element is rubbed, the two-dimensional nanosheet internal lubricant reduces the friction coefficient of the material and reduces wear. At the same time, the force-heat conversion molecular friction body can efficiently convert the mechanical stress generated by friction into local heat, which can promote the breaking and recombination of the chemical bonds of the dynamic reversible network, thereby repairing the scratches.

[0014] In a specific embodiment, the two-dimensional nanosheet internal lubricant can be one or both of graphene oxide or boron nitride nanosheet; the force-heat conversion molecular friction body can be one or both of aramid pulp or boron nitride nanotube.

[0015] In another specific embodiment, the permanent crosslinking system is composed of a vulcanizing agent, a vulcanizing active agent and at least one vulcanization accelerator. Among them, the vulcanizing agent is sulfur, and the vulcanizing active agent includes zinc oxide and stearic acid.

[0016] The second aspect of the present application provides a method for preparing a high-wear-resistance automobile rubber sealing element.

[0017] The method comprises the following steps: S1, mixing: a multi-stage mixing process is adopted. First, under high-temperature conditions, maleimide-functionalized ethylene-propylene-diene rubber, furfuryl-anchored nano-silica, two-dimensional nanosheet internal lubricant, force-heat conversion molecular friction body, naphthenic oil, antioxidant and vulcanizing active agent in the permanent crosslinking system are mixed to obtain a masterbatch. This high-temperature stage aims to achieve sufficient dispersion of the nano-filler and functional additives in the rubber matrix.

[0018] Subsequently, under low-temperature conditions, the vulcanizing agent and vulcanization accelerator in the permanent crosslinking system are mixed into the masterbatch to obtain a final rubber compound. The purpose of low-temperature mixing is to prevent early vulcanization of the rubber compound during the mixing stage.

[0019] S2, vulcanization molding: the final rubber compound is subjected to extrusion molding and vulcanization under predetermined conditions.

[0020] During the vulcanization process, the permanent crosslinking system reacts to form a permanent vulcanization network; at the same time, the maleimide groups on the maleimide-functionalized ethylene-propylene-diene rubber undergo Diels-Alder reaction with the furfuryl groups on the furfuryl-anchored nano-silica to form a dynamic reversible network. Finally, the high-wear-resistance automobile rubber sealing element is obtained.

[0021] In one specific embodiment, before step S1, the method further comprises a step of preparing the maleimide-functionalized ethylene-propylene-diene rubber. This step is carried out in a continuous melt reaction manner in a twin-screw extruder, specifically comprising: First, the ethylene-propylene-diene rubber is mixed with maleic anhydride and an initiator to carry out a melt grafting reaction, generating a maleic anhydride-grafted ethylene-propylene-diene rubber melt; Subsequently, in the downstream section of the twin-screw extruder, a diamine compound is added to the melt to carry out an imidization reaction, and finally the maleimide-functionalized ethylene-propylene-diene rubber is obtained.

[0022] This continuous preparation process improves production efficiency and product uniformity.

[0023] In another specific embodiment, before step S1, the method further comprises a step of preparing the furfuryl-anchored nano-silica. This step specifically comprises: First, the nanosilica is ultrasonically dispersed in a polar organic solvent to prevent agglomeration, and then an epoxy silane coupling agent is added, and a grafting reaction is carried out at a temperature of 70-90 DEG C; Then, the product of the previous step is separated and purified, and then it is redispersed in the polar organic solvent and furfurylamine is added, and an open-loop anchoring reaction is carried out at a temperature of 80-100 DEG C, and finally the furfuryl-anchored nanosilica is obtained.

[0024] This method ensures high purity of the final product through purification of the intermediate product.

[0025] As a preferred process scheme, the multi-stage mixing process in step S1 is carried out in an internal mixer. In the high-temperature mixing stage, the mixing temperature is controlled at 140-160 DEG C, and the rotor speed is 40-60 rpm; in the low-temperature mixing stage, the discharge temperature is controlled below 100 DEG C, and the rotor speed is 30-40 rpm.

[0026] As a preferred process scheme, the preset conditions in step S2 include a curing temperature of 170-190 DEG C and a total curing time of 3-8 minutes.

[0027] In a preferred embodiment, the vulcanization forming in step S2 adopts a continuous vulcanization forming process. The specific steps of the process include: First, the final mixing rubber is extruded into a continuous profile of a predetermined shape by an extruder; Then, the continuous profile is directly introduced into a heating device connected thereto, and vulcanization is completed in the heating device.

[0028] Further, in order to optimize the continuous production process, the extruder can be a cold-feed extruder, and the screw speed is set to 20-50 rpm. The heating device can use a combination of microwave heating and hot air heating, and the microwave heating power is set to 5-10 kW to achieve rapid and uniform vulcanization.

[0029] The application provides a high-wear-resistance automobile rubber sealing element and a preparation method thereof. 1. The application constructs a double interpenetrating network structure of permanent vulcanization network and dynamic reversible chemical network in the rubber matrix, which gives the sealing element excellent damage self-repairing ability. The permanent network ensures the stability of the macrostructure and the basic mechanical properties of the material, and the dynamic reversible network formed between the maleimide-functionalized ternary ethylene-propylene rubber and the furfuryl-anchored nanosilica can repair the small scratches on the surface of the material when the force-heat conversion molecular friction body converts the friction stress into local heat, thereby significantly prolonging the effective service life of the sealing element.

[0030] 2、The application significantly improves the wear resistance of the sealing element by introducing two-dimensional nanosheet internal lubricant and furan-anchored nanosilica in the formula system. The furan-anchored nanosilica acts as an efficient reinforcing filler, improving the hardness and wear resistance of the rubber matrix; at the same time, the two-dimensional nanosheet internal lubricant with a layered structure plays a solid lubrication role inside the material, effectively reducing the friction coefficient of the sealing element during friction, reducing the wear amount of the material, so that the product can adapt to more severe working conditions.

[0031] 3、The preparation method provided by the application, especially the continuous melt reaction of functionalized EPDM rubber by using a twin-screw extruder, and the continuous extrusion vulcanization molding process, realize efficient and continuous production of the sealing element. Compared with the traditional batch kettle reaction and molding vulcanization process, the preparation method of the application greatly shortens the production cycle, improves the production efficiency, and the continuous process is more conducive to ensuring the uniformity and stability of the product quality. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the description of the application. Obviously, the described embodiments are only part of the embodiments of the application, not all. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the application.

[0033] Experimental materials: The main raw materials and reagents used in the following examples and comparative examples are as follows, and the reagents not specifically described are commercially available analytical pure or higher grade products.

[0034] EPDM rubber, CAS number: 25038-36-2; Maleic anhydride, CAS number: 108-31-6; Dicumyl peroxide, CAS number: 80-43-3; 4,4'-diaminodiphenyl ether, CAS number: 101-80-4; Fumed silica, CAS number: 112945-52-5; Furfurylamine, CAS number: 617-89-0; Boron nitride nanosheet, CAS number: 10043-11-5; Boron nitride nanotube, CAS number: 10043-11-5; Sulfur, CAS number: 7704-34-9; Zinc oxide, CAS number: 1314-13-2; Stearic acid, CAS No.: 57-11-4; Naphthenic oil, CAS No.: 999-97-3; Antioxidant 4020 (Irganox® 1010) - (1,3-dimethylbutyl)- - phenyl-p-phenylenediamine), CAS No.: 793-24-8; Anhydrous ethanol, CAS No.: 64-17-5; Example 1-3: Example 1: The present embodiment provides a high-wear-resistant automobile rubber sealing element and a preparation method thereof.

[0035] The formula of the rubber composition used to prepare the sealing element includes, by weight parts: 100 parts of maleimide-functionalized EPDM; 30 parts of furfuryl-anchored nano-silica; 1.0 part of graphene oxide as an internal lubricant of two-dimensional nanosheets; 0.3 part of aramid pulp as a force-heat conversion molecular friction body; 1.5 parts of sulfur; 5.0 parts of zinc oxide; 1.0 part of stearic acid; 0.8 part of accelerator TMTD; 1.2 parts of accelerator CBS; 10 parts of naphthenic oil; 1.5 parts of antioxidant (4020).

[0036] Raw material preparation: Preparation of maleimide-functionalized EPDM: A co-rotating twin-screw extruder (L / D = 40) was used for continuous melt reaction. 100 parts by weight of EPDM, 5 parts by weight of maleic anhydride, and 0.5 parts by weight of initiator DCP were added at the first feeding port of the extruder. The temperatures of zones 1-4 of the extruder were set to 180-220°C, and the screw rotation speed was 150 rpm for melt grafting reaction.

[0037] At the fifth section of the extruder, 4 parts by weight of 4,4'-oxydianiline (ODA) was added through the side feeding port. The temperatures of zones 5-8 of the extruder were set to 220-250°C for imidization reaction. After passing through a cooling water tank and a granulator, maleimide-functionalized EPDM particles were obtained.

[0038] Preparation of furfuryl-anchored nano-silica: In a 1000 mL three-necked flask, 500 mL of anhydrous ethanol and 50 g of fumed nano-silica were added and ultrasonically dispersed for 30 minutes. The temperature was raised to 80°C, and 20 g of epoxy silane coupling agent KH-560 was added dropwise, and the reaction was continued for 12 hours with stirring. After the reaction was completed, the product was separated by centrifugation and washed with anhydrous ethanol three times, and then dried in a vacuum oven at 80°C for 6 hours to obtain an intermediate product.

[0039] The dried intermediate was redispersed in 500 mL of absolute ethanol, 25 g of furfurylamine was added, the temperature was raised to 90 °C and the reaction was stirred for 24 hours. After the reaction was completed, the product was separated by centrifugation, washed with absolute ethanol three times, and finally dried in a vacuum oven at 80 °C for 12 hours to obtain furfuryl-anchored nanosilica powder.

[0040] Seal preparation: Mixing: Multi-stage mixing was performed using a Haake torque rheometer. The mixing temperature was set to 150 °C, the rotor speed was 50 rpm, and the maleimide-functionalized ethylene-propylene-diene rubber, furfuryl-anchored nanosilica, graphene oxide, aramid pulp, naphthenic oil, antioxidant 4020, zinc oxide, and stearic acid were added in sequence, and the mixing was carried out for 10 minutes to obtain the masterbatch.

[0041] The masterbatch was taken out and cooled to room temperature. The mixing chamber temperature was reduced to 90 °C, the rotor speed was adjusted to 35 rpm, the masterbatch was reinserted, and sulfur, accelerator TMTD, and accelerator CBS were added, and the mixing was carried out for 5 minutes to obtain the final rubber compound.

[0042] Continuous vulcanization molding: The final rubber compound was extruded through a cold feed extruder with a screw diameter of 65 mm, the screw speed was set to 35 rpm, and the die temperature was 90 °C, and the continuous profiled section was extruded.

[0043] The continuous profiled section directly entered the microwave hot air continuous vulcanization production line connected thereto. The microwave heating power was set to 8 kW, the temperature of the hot air heating zone was 180 °C, and the total vulcanization time of the profiled section was 5 minutes by adjusting the production line speed. After cooling and length cutting at the end of the production line, the high wear-resistant automobile rubber seal finished product was obtained.

[0044] Example 2: The present embodiment provides a high wear-resistant automobile rubber seal and a method for preparing the same.

[0045] The formula of the rubber composition used to prepare the seal includes, by weight parts: maleimide-functionalized ethylene-propylene-diene rubber 100 parts; furfuryl-anchored nanosilica 40 parts; boron nitride nanosheet as a two-dimensional nanosheet internal lubricant 1.5 parts; boron nitride nanotube as a force-heat conversion molecular friction body 0.5 parts; sulfur 1.5 parts; zinc oxide 5.0 parts; stearic acid 1.0 parts; accelerator TMTD 0.8 parts; accelerator CBS 1.2 parts; naphthenic oil 5 parts; antioxidant (4020) 2 parts.

[0046] Preparation process: Except for the different formula components and amounts, the remaining raw material preparation steps and seal preparation steps are exactly the same as those of Example 1.

[0047] Example 3 The present example provides a high wear-resistant automobile rubber seal and a preparation method thereof.

[0048] The present example adopts exactly the same formula as Example 1. By weight, it includes: 100 parts of maleimide-functionalized terpolymer ethylene-propylene rubber; 30 parts of furfuryl-anchored nano-silica; 1.0 part of graphene oxide as an in-plane nanosheet internal lubricant; 0.3 part of aramid pulp as a force-heat conversion molecular friction body; 1.5 parts of sulfur; 5.0 parts of zinc oxide; 1.0 part of stearic acid; 0.8 part of accelerator TMTD; 1.2 parts of accelerator CBS; 10 parts of naphthenic oil; 1.5 parts of antioxidant (4020).

[0049] Preparation process: The raw material preparation step and the mixing step are exactly the same as Example 1. In the continuous vulcanization molding step, the process parameters are adjusted as follows: the microwave heating power is set to 6 kW, the temperature of the hot air heating zone is 170°C, and the total vulcanization time of the profile is 7 minutes by adjusting the production line speed. The remaining steps are exactly the same as Example 1.

[0050] Comparative Examples 1-4 Comparative Example 1 Compared with Example 1, the difference lies in that 100 parts of unfunctionalized terpolymer ethylene-propylene rubber (EPDM) is used to replace the maleimide-functionalized terpolymer ethylene-propylene rubber in the formula, and 30 parts of un-surface-treated fumed nano-silica is used to replace the furfuryl-anchored nano-silica. The rest is the same.

[0051] Comparative Example 2 Compared with Example 1, the difference lies in that the force-heat conversion molecular friction body (aramid pulp) is not included in the formula. The rest is the same.

[0052] Comparative Example 3 Compared with Example 1, the difference lies in that the in-plane nanosheet internal lubricant (graphene oxide) is not included in the formula. The rest is the same.

[0053] Comparative Example 4 Compared with Example 1, the difference lies in that the vulcanization molding process in the seal preparation step does not use continuous vulcanization molding, but the final rubber compound prepared in Example 1 is molded and vulcanized in a flat plate vulcanizing machine at 180°C and 20MPa for 10 minutes. The rest is the same.

[0054] Test Examples 1 and 2 Test Example 1 In order to verify the technical effects of the present application, the rubber seals prepared in Examples 1-3 and Comparative Examples 1-3 are subjected to performance testing.

[0055] Test method: Mechanical property test: According to GB / T528-2009 standard, the sample was cut into dumbbell-shaped test piece. The tensile strength and elongation at break were recorded at room temperature with a tensile rate of 500 mm / min.

[0056] Abrasion resistance test: According to GB / T1689-1998 standard, the sample was tested by Akron abrasion tester. The sample was cut into standard size round wheel test piece, and the test load was set to 26.7 N, and the test wheel inclination angle was 15°. The volume abrasion amount after 1.61 km of travel was recorded, and the smaller the volume abrasion amount value, the better the abrasion resistance.

[0057] Self-repairing property test: First, the tensile strength of a group of original samples was tested according to the method in the abrasion resistance test, denoted as σ 原始 .

[0058] Subsequently, another group of identical samples was taken, and a vertical scratch with a depth of 1 mm and a length of 5 mm was made on the central position of the sample surface using a standard blade.

[0059] The scratched sample was placed in a constant temperature drying oven at 100°C for 2 hours.

[0060] After the sample was taken out of the oven and completely cooled to room temperature, its tensile strength was tested again according to the method in the mechanical property test, denoted as σ 修复后 .

[0061] The calculation formula of repair efficiency η is: η (%) = (σ 修复后 / σ 原始 ) × 100%.

[0062] Test results: The performance test results of each example and comparative example are summarized in Table 1.

[0063] Table 1: Performance test results of each example and comparative example ; Result analysis: The test results show that the samples of Examples 1-3 have significant differences in comprehensive performance compared with the samples of Comparative Examples 1-3. The repair efficiency of Example 1 reaches 91.3%, while the repair efficiency of Comparative Example 1 is only 9.4%. The difference is due to the construction of a double-network structure composed of a permanent vulcanized network and a dynamic reversible network in the sample matrix of Example 1. When subjected to heat, the chemical bonds in the pure permanent network of Comparative Example 1 cannot recombine, so the material has no repair ability; in the sample of Example 1, the dynamic chemical bonds formed between the maleimide groups and the fur groups undergo reversible breaking and recombination, so that the scratch is healed and the tensile strength of the material is restored.

[0064] Comparing the data of Example 1 and Comparative Example 3, it can be seen that the tensile strength and repair efficiency of the two are basically at the same level, but the volume wear of Example 1 (0.16 cm 3 / 1.61 km) is much lower than that of Comparative Example 3 (0.41 cm 3 / 1.61 km). This shows that the introduction of two-dimensional nanosheet internal lubricant (graphene oxide) in the formula can effectively reduce the friction coefficient of the material without affecting the strength and repair function of the material, thereby significantly reducing the wear of the material during friction and improving its wear resistance.

[0065] From the data of Examples 1, 2, and 3, it can be seen that adjusting the formula components and process parameters within the scope of the technical solution defined in the present application can prepare a material with high tensile strength, low wear, and high repair efficiency. Compared with Example 1, the repair efficiency of Comparative Example 2 decreased from 91.3% to 52.1%, which shows that the presence of the thermo-convertible molecular friction body plays an important role in promoting the repair process. The technical solution of the present application successfully solves the technical contradiction between material wear resistance and self-repairing ability through the synergistic effect of the above-mentioned specific components, and obtains a rubber material with excellent comprehensive performance.

[0066] Test Example 2: To verify the technical advantages of the continuous vulcanization molding process of the present application in production efficiency and energy consumption.

[0067] Test method: The continuous vulcanization production line of Example 1 and the flat plate vulcanizing machine of Comparative Example 4 were used to vulcanize and mold automobile door and window sealing elements of the same size. The following key process parameters were recorded and compared: Vulcanization molding cycle of a single product: refers to the total time from entering the vulcanization equipment to completing vulcanization and taking out a single product; Output per unit time: calculate the number of qualified products that can be produced by the two processes per hour; Energy consumption per product: the total energy consumption of the equipment running for one hour is divided by the total number of products in that hour to obtain the energy consumption per product.

[0068] Test results: The process efficiency test data of Example 1 and Comparative Example 4 are arranged, and the results are shown in Table 3.

[0069] Table 2: Process efficiency comparison data ; Conclusion: From the data in Table 2, compared with the traditional batch flat vulcanization process adopted by Comparative Example 4, the continuous vulcanization molding process adopted by Example 1 of the present application shows great superiority.

[0070] The molding cycle of a single product is significantly shortened from 600 seconds to 90 seconds, the production efficiency is increased by nearly 7 times; the unit hour output is greatly increased from 6 to 40; at the same time, the energy consumption per product is also significantly reduced from 0.8 kilowatt hours to 0.2 kilowatt hours, saving 75% of energy.

[0071] The test results powerfully prove that the preparation method proposed by the present application is not only feasible, but also has significant superiority and progress in production efficiency, output and energy utilization compared with the prior art.

[0072] Although embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and alterations can be made thereto without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high abrasion resistant automotive rubber seal, characterized by, A rubber composition made from the following raw materials by weight is vulcanized to form: Maleimide-functionalized ethylene propylene diene rubber: 100 parts; Furfuryl-anchored nano-silica: 20-40 parts; Two-dimensional nanosheet internal lubricant: 0.5-1.5 parts; Force-heat conversion molecular friction body: 0.1-0.5 parts; Permanent crosslinking system: 5-11 parts; Naphthenic oil: 5-15 parts; Antioxidant: 1-2 parts.

2. A high wear resistant rubber seal for a vehicle as claimed in claim 1, wherein, The two-dimensional nanosheet internal lubricant is one or both of graphene oxide or boron nitride nanosheet; The force-heat conversion molecular friction body is one or both of aramid pulp or boron nitride nanotube.

3. A high wear resistant rubber seal for a vehicle as claimed in claim 1, wherein, The permanent crosslinking system consists of a vulcanizing agent, a vulcanization activator and at least one vulcanization accelerator, the antioxidant being - (1,3-dimethylbutyl)- - phenyl-p-phenylenediamine; The vulcanizing agent is sulfur, and the vulcanizing active agent includes zinc oxide and stearic acid.

4. A process for the production of a high abrasion resistant rubber seal for automotive applications as claimed in any one of the preceding claims 1 to 3, characterized in that, The method includes the following steps: S1, mixing: using a multi-stage mixing process, the maleimide-functionalized ethylene propylene diene rubber, furfuryl-anchored nano-silica, two-dimensional nanosheet internal lubricant, force-heat conversion molecular friction body, naphthenic oil, antioxidant, and vulcanizing active agent in the permanent crosslinking system are mixed uniformly at high temperature to obtain a master batch, and then the vulcanizing agent and vulcanizing accelerator in the permanent crosslinking system are mixed into the master batch at low temperature to obtain a final batch; S2, vulcanization molding: the final batch is extruded and molded, and vulcanized under preset conditions, so that the permanent crosslinking system reacts to form a permanent vulcanization network, at the same time, the maleimide groups on the maleimide-functionalized ethylene propylene diene rubber and the furfuryl groups on the furfuryl-anchored nano-silica undergo Diels-Alder reaction to form a dynamic reversible network, thereby obtaining the high-wear-resistance automobile rubber sealing element.

5. The method of claim 4, wherein the high abrasion resistant rubber seal for a vehicle is prepared by mixing the rubber composition of claim 1 with a rubber material and a filler, and then molding the mixture. Before step S1, a step of preparing the maleimide-functionalized ethylene propylene diene rubber is further included, specifically a continuous melt reaction performed in a twin-screw extruder, including: The ethylene propylene diene rubber is mixed with maleic anhydride and an initiator to perform a melt grafting reaction, thereby obtaining a maleic anhydride grafted ethylene propylene diene rubber melt; In the downstream section of the twin-screw extruder, a diamine compound is added to the ethylene propylene diene rubber melt to perform an imidization reaction, thereby obtaining the maleimide-functionalized ethylene propylene diene rubber.

6. The method for preparing a high wear-resistant automotive rubber seal according to claim 4, characterized in that, Before step S1, a step of preparing the furfuryl-anchored nano-silica is further included, specifically including: The nano-silica is ultrasonically dispersed in a polar organic solvent, and then an epoxy silane coupling agent is added to perform a grafting reaction at a temperature of 70-90°C; After the product of the grafting reaction is separated and purified, it is re-dispersed in the polar organic solvent and furfurylamine is added to perform an open-loop anchoring reaction at a temperature of 80-100°C, thereby obtaining the furfuryl-anchored nano-silica.

7. The method for preparing a high wear-resistant automotive rubber seal according to claim 4, characterized in that, The multi-stage mixing process in step S1 is specifically performed in an internal mixer, wherein the mixing temperature in the high-temperature mixing stage is controlled at 140-160°C, and the rotor speed is 40-60 rpm; the discharge temperature in the low-temperature mixing stage is controlled below 100°C, and the rotor speed is 30-40 rpm.

8. The method for preparing a high wear-resistant automotive rubber seal according to claim 4, characterized in that, The preset conditions in step S2 include a vulcanization temperature of 170-190°C and a total vulcanization time of 3-8 minutes.

9. The method for preparing a high wear-resistant automotive rubber seal according to claim 4, characterized in that, The vulcanization forming in the step S2 adopts a continuous vulcanization forming process, and the specific steps include: extruding the final rubber into a continuous profile of a predetermined shape through an extruder; directly introducing the continuous profile into a heating device connected therewith, and completing vulcanization in the heating device.

10. The method of claim 9, wherein the high abrasion resistant rubber seal for a vehicle is prepared by mixing the rubber composition of claim 1 with a rubber material and a filler, and then molding the mixture. The extruder is a cold feeding extruder, and the screw rotation speed is 20-50 rpm. The heating device adopts a combination of microwave heating and hot air heating, and the microwave heating power is 5-10 kW.

Images