Wear-resistant high-temperature-resistant high-hardness rubber ring and preparation method thereof

Abstract

The invention relates to the technical field of rubber materials, in particular to a high-temperature-resistant and high-hardness rubber ring and a preparation method thereof, and the high-temperature-resistant and high-hardness rubber ring comprises the following raw materials in parts by mass: 30-50 parts of hydrogenated nitrile rubber, 30-35 parts of a composite reinforcing aid, 3-5 parts of a filler, 5-15 parts of ethylene propylene diene monomer, 5-15 parts of a plasticizer, 2-6 parts of an active agent, 0.5-1.5 parts of a vulcanizing agent, 0.5-1.5 parts of an accelerant, 0.1-0.6 part of a lubricant and 0.3-0.4 part of an anti-aging agent. The rubber ring disclosed by the invention has relatively good hardness, ageing resistance, flame retardance and wear resistance.

Description

Technical Field

[0001] This invention relates to the field of rubber materials technology, and in particular to a wear-resistant, high-temperature-resistant, high-hardness rubber ring and its preparation method. Background Technology

[0002] Rubber, a key material possessing high elasticity, insulation, and chemical corrosion resistance, has been widely used in the automotive, aerospace, power equipment, and construction industries. However, with the increasing complexity of industrial environments, the performance limitations of traditional rubber materials in extreme conditions are becoming increasingly apparent. For example, in high-radiation environments such as nuclear power and aerospace, conventional ethylene propylene rubber is prone to hardening and cracking due to radiation degradation, leading to sealing failure and leakage risks. In the field of cable protection, while halogenated flame retardants can improve fire resistance, they sacrifice the material's elasticity and mechanical properties, and produce toxic fumes during combustion. Furthermore, the lifespan of rubber products is particularly problematic: dynamic components such as bushings and conveyor belts are prone to surface cracking and decreased wear resistance due to long-term friction and ozone corrosion, significantly shortening equipment maintenance cycles.

[0003] Researchers are increasingly exploring the modification of rubber, but many problems still need to be solved. For example, patent number CN118725466A discloses "rubber materials and their preparation methods and applications", which includes the following raw materials: 50-70 parts of polymer modified EPDM rubber and alkenyl silica gel, 30-50 parts of polymer modified EPDM rubber and olefin-based silane coupling agent, 50-80 parts of filler, 45-55 parts of plasticizer, 4-6 parts of zinc oxide, and 4-6 parts of vulcanizing agent. This rubber material has the advantages of high temperature resistance and fatigue resistance.

[0004] For example, CN118459866A discloses "Rubber Material Composition, Rubber Material and its Preparation Method and Application", which includes the following raw materials: styrene-butadiene rubber, ethylene propylene rubber, graphite, carbon black and additives. The styrene-butadiene rubber, ethylene propylene rubber, graphite, carbon black and additives are mixed and reacted to obtain a rubber material. This rubber material is suitable for use in oilfield downhole sealing. The rubber material has excellent properties of hydrocarbon absorption and hydrogen expansion, mechanical properties and aging resistance.

[0005] Rubber rings are widely used in downhole applications. They often need to withstand high pressure without deforming and have high wear resistance. Although the aforementioned patents have solved the mechanical properties of rubber, the flame retardant properties of rubber and other polymer materials are relatively poor, making them easy to become a fuse.

[0006] Therefore, it is urgent to develop a rubber ring suitable for downhole operations that has excellent temperature resistance, wear resistance, and high hardness, while also having good flame retardant properties. Summary of the Invention

[0007] The purpose of this invention is to provide a wear-resistant, high-temperature resistant, and high-hardness rubber ring and its preparation method, so as to solve the problems of poor hardness and wear resistance of rubber rings due to poor carbon black dispersion, and the flammability of rubber.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: This invention provides a wear-resistant, high-temperature resistant, and high-hardness rubber ring, comprising the following raw materials in parts by weight: 30-50 parts hydrogenated nitrile rubber, 30-35 parts composite reinforcing agent, 3-5 parts filler, 5-15 parts ethylene propylene diene monomer (EPDM) rubber, 5-15 parts plasticizer, 2-6 parts activator, 0.5-1.5 parts vulcanizing agent, 0.5-1.5 parts accelerator, 0.1-0.6 parts lubricant, and 0.3-0.4 parts antioxidant.

[0009] In some embodiments, the composite reinforcing agent is composed of modified carbon black and modified quartz in a mass ratio of 1:(1.4~1.6).

[0010] Preferably, the composite reinforcing agent is composed of modified carbon black and modified quartz, with a mass ratio of 1:1.5.

[0011] This application, by adjusting the ratio of modified carbon black additives and modified quartz, can avoid the problem of increased brittleness of rubber rings while balancing the hardness of rubber rings.

[0012] In some embodiments, the method for preparing the modified quartz includes the following steps: mixing quartz, KH550 silane coupling agent and isopropanol, heating to 85~95℃ and stirring for 5~7h, filtering, washing with deionized water, and drying to obtain modified quartz.

[0013] This application modifies quartz using a silane coupling agent, which improves the dispersibility of quartz in a rubber system and prevents quartz agglomeration, thereby improving the mechanical properties of the rubber.

[0014] In some embodiments, the preparation method of the modified carbon black additive includes the following steps: S1. Mix carbon black with an oxidant solution, disperse by ultrasonic stirring, then heat to 75~85℃ and stir for 24~26h, then wash with deionized water and dry to obtain pretreated carbon black; S2. Mix γ-aminopropyltriethoxysilane with an ethanol solution, add the pretreated carbon black obtained in step S1, disperse ultrasonically, heat to reflux and stir for 6-8 hours, wash with anhydrous ethanol after completion, dry to obtain aminated carbon black. S3. Mix the aminoated carbon black obtained in step S2 with the first solvent, cool it to -5~0℃, add 3-hydroxyphenylphosphopropionic acid, then heat it to 65~75℃ and stir it at a constant temperature for 1~3h. After the end, filter it, wash it with anhydrous ethanol, and dry it to obtain solid product A. S4. Mix cyanuric chloride, 2,2,6,6-tetramethylpiperidineamine and di-n-octylamine, add to the second solvent, cool to -5~0℃, then add an acid-binding agent, heat to 40~60℃ and stir at a constant temperature for 6~10h, then add the solid product A obtained in step S3, continue stirring for 6~10h, after which filter, wash with anhydrous ethanol, and dry to obtain solid product B; S5. Disperse the solid product B obtained in step S4 in anhydrous ethanol, add 1,2-epoxy-5-hexene, heat to 50~60℃ and stir at a constant temperature for 10~13h, filter, wash with deionized water, and dry to obtain modified carbon black additive.

[0015] This application first pretreats carbon black with an oxidant to hydroxylate its surface, then modifies the surface with an amine-containing silane coupling agent to obtain carbon black with active amine groups on its surface. The carboxyl and amine groups of 3-hydroxyphenylphosphonopropionic acid are then reacted to introduce phosphate groups into the carbon black surface structure. Furthermore, the remaining amine groups are modified with 1,2-epoxy-5-hexene, 2,2,6,6-tetramethylpiperidinamine, di-n-octylamine, and cyanuric chloride to finally obtain a modified carbon black additive. The surface structure of this modified carbon black additive contains a large number of long-chain alkyl groups and double bonds, which enable better dispersion of carbon black in rubber substrates. Simultaneously, the double bonds can crosslink with rubber, further improving the compatibility between carbon black and rubber, and also increasing the hardness and wear resistance of the rubber. In addition, the surface structure of the modified carbon black additive contains hindered amine structures, which can improve the aging resistance of rubber and extend its service and storage period.

[0016] In some embodiments, in step S1, the oxidant solution is a hydrogen peroxide solution.

[0017] In some embodiments, the concentration of the hydrogen peroxide solution is 25-30 wt%.

[0018] In some embodiments, in step S2, the volume-to-mass ratio of the γ-aminopropyltriethoxysilane to the pretreated carbon black is (3~5) mL:1g.

[0019] Preferably, in step S2, the volume-to-mass ratio of γ-aminopropyltriethoxysilane to pretreated carbon black is 4 mL: 1 g.

[0020] This application enables the silane coupling agent to form a more complete chemical bond with the hydroxyl groups on the surface of carbon black by adjusting the volume-to-mass ratio of γ-aminopropyltriethoxysilane to pretreated carbon black.

[0021] In some embodiments, in step S3, the first solvent is toluene and / or xylene.

[0022] Preferably, in step S3, the first solvent is toluene.

[0023] In some embodiments, in step S3, the mass ratio of the aminoated carbon black to 3-hydroxyphenylphosphopropionic acid is 1:(0.1~0.4).

[0024] Preferably, in step S3, the mass ratio of the aminoated carbon black to 3-hydroxyphenylphosphopropionic acid is 1:0.3.

[0025] This application enables the amidation of some amino groups on the surface of amino carbon black with 3-hydroxyphenylphosphonopropionic acid by adjusting the mass ratio of amino carbon black to 3-hydroxyphenylphosphonopropionic acid, thereby grafting a solid product A containing phosphate groups on the surface, while also allowing the remaining amino groups to undergo subsequent grafting reactions.

[0026] In some embodiments, in step S4, the second solvent is N,N-dimethylformamide and / or 1,4-dioxane.

[0027] Preferably, in step S4, the second solvent is N,N-dimethylformamide.

[0028] In some embodiments, in step S4, the mass ratio of the solid product A to cyanuric chloride is 1:(0.3~0.6).

[0029] Preferably, in step S4, the mass ratio of the solid product A to cyanuric chloride is 1:0.4.

[0030] In some embodiments, in step S4, the molar ratio of 2,2,6,6-tetramethylpiperidineamine, di-n-octylamine, and cyanuric chloride is (0.2~0.4):(0.2~0.4):1.

[0031] Preferably, in step S4, the molar ratio of 2,2,6,6-tetramethylpiperidineamine, di-n-octylamine, and cyanuric chloride is 0.3:0.3:1.

[0032] This application enables the reaction of 2,2,6,6-tetramethylpiperidineamine, di-n-octylamine, and cyanuric chloride with two halogen groups in cyanuric chloride by adjusting the molar ratio of 2,2,6,6-tetramethylpiperidineamine and di-n-octylamine, while reserving one halogen group to react with the hydroxyl groups on the carbon black surface, thereby obtaining a solid product B with a surface structure containing hindered amines and double-chain alkyl groups.

[0033] In some embodiments, in step S4, the molar ratio of the acid-binding agent to cyanuric chloride is (3.5~4.5):1.

[0034] Preferably, in step S4, the molar ratio of the acid-binding agent to cyanuric chloride is 4:1.

[0035] In some embodiments, in step S5, the mass ratio of the solid product B to 1,2-epoxy-5-hexene is 1:(1~2).

[0036] Preferably, in step S5, the mass ratio of the solid product B to 1,2-epoxy-5-hexene is 1:1.5.

[0037] In some embodiments, the filler is composed of dolomite and kaolin in a mass ratio of 1:(0.5~1).

[0038] Preferably, the filler is composed of dolomite and kaolin, with a mass ratio of 1:0.7.

[0039] In some embodiments, the plasticizer is composed of trioctyl trimellitate, tert-butylphenyl phosphate and aromatic oil in a mass ratio of 1:(0.1~0.3):(4~6).

[0040] Preferably, the plasticizer is composed of trioctyl trimellitate, tert-butylphenyl phosphate and aromatic oil, with a mass ratio of 1:0.2:5.

[0041] In some embodiments, the activator is zinc oxide and / or stearic acid.

[0042] In some embodiments, the vulcanizing agent is sulfur.

[0043] In some embodiments, the accelerator is triphenylphosphine oxide.

[0044] In some embodiments, the lubricant is paraffin wax.

[0045] Another aspect of the present invention provides a method for preparing a wear-resistant, high-temperature resistant, and high-hardness rubber ring, comprising the following steps: mixing hydrogenated nitrile rubber, EPDM rubber, composite reinforcing agent, filler, plasticizer, lubricant, and antioxidant at 70-90°C for 4-8 minutes; then adding activator, vulcanizing agent, and accelerator and mixing at 100-130°C for 10-15 minutes; extruding the mixture into a mold using an extruder; and obtaining a wear-resistant, high-temperature resistant, and high-hardness rubber ring after cooling.

[0046] Compared with the prior art, the present invention has the following beneficial effects: (1) The wear-resistant, high-temperature resistant, and high-hardness rubber ring of the present invention is prepared by using hydrogenated nitrile rubber, composite reinforcing agent, filler, EPDM rubber, plasticizer, activator, vulcanizing agent, accelerator, lubricant, and antioxidant as the main raw materials. The resulting rubber ring has good wear resistance, hardness, and high-temperature resistance, and also has anti-aging and flame-retardant properties.

[0047] (2) The composite reinforcing agent of the present invention is composed of modified carbon black and modified quartz. By adjusting the mass ratio of the two, the hardness and brittleness of the rubber ring can be balanced.

[0048] (3) The modified carbon black additive of the present invention contains a large number of long-chain alkyl and double bond structures in its surface structure, which can enable carbon black to have a better dispersion effect in rubber substrate. At the same time, the double bond structure can crosslink with rubber, which not only further improves the compatibility between carbon black and rubber, but also improves the hardness and wear resistance of rubber. In addition, the modified carbon black additive contains hindered amine structure in its surface structure, which can improve the anti-aging ability of rubber and extend the service and storage period. Detailed Implementation

[0049] The technical solution of the present invention will be clearly and completely described below with reference to specific embodiments. However, those skilled in the art will understand that the embodiments described below are some embodiments of the present invention, but not all embodiments, and are only used to illustrate the present invention, and should not be regarded as limiting the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall be followed. Where the manufacturers of reagents or instruments are not specified, they are all conventional products that can be purchased commercially.

[0050] Unless otherwise specified, those skilled in the art may select from the following post-processing operations such as "mixing", "drying", "washing", "filtering" and "drying" according to actual conditions, without further limitation.

[0051] Carbon black was purchased from Tianjin Yiborui Chemical Co., Ltd.; hydrogenated nitrile butadiene rubber was purchased from Guangzhou Keen Materials Co., Ltd.; ethylene propylene diene monomer (EPDM) rubber was purchased from Shanghai Tingyuan Plastic Technology Co., Ltd.; paraffin oil was purchased from Xinji Haorui Petrochemical Co., Ltd.; and aromatic oil was purchased from Xingtai Quande Chemical Co., Ltd.

[0052] Preparation Example 1 The preparation method of modified carbon black additives includes the following steps: S1. Mix 10g of carbon black with 400mL of 27wt% hydrogen peroxide solution, disperse by ultrasonic stirring, then heat to 80℃ and stir for 25h, then wash with deionized water and dry at 90℃ for 5h to obtain pretreated carbon black. S2. Mix 40 mL of γ-aminopropyltriethoxysilane with 2 L of 90 wt% ethanol solution, add 10 g of the pretreated carbon black obtained in step S1, disperse by ultrasonication, heat to reflux and stir for 7 h, wash with anhydrous ethanol after the end, and dry at 85 °C for 6 h to obtain aminated carbon black. S3. Mix 10g of the aminoated carbon black obtained in step S2 with 300mL of toluene, cool to -3℃, add 3g of 3-hydroxyphenylphosphopropionic acid, then heat to 70℃ and stir for 2h. After the mixture is finished, filter, wash with anhydrous ethanol, and dry at 100℃ for 6h to obtain solid product A. S4. Mix 4g of cyanuric chloride, 1g of 2,2,6,6-tetramethylpiperidinamine and 1.45g of di-n-octylamine, add to 100mL of N,N-dimethylformamide, cool to -3℃, then add 0.08mol of sodium carbonate, heat to 50℃ and stir for 8h, then add 10g of solid product A obtained in step S3, continue stirring for 8h, after which filter, wash with anhydrous ethanol, and dry at 100℃ for 6h to obtain solid product B; S5. Disperse 10g of solid product B obtained in step S4 in 300mL of anhydrous ethanol, add 15g of 1,2-epoxy-5-hexene, heat to 55℃ and stir for 12h, filter, wash with deionized water, and dry at 85℃ for 7h to obtain modified carbon black additive.

[0053] Preparation Example 2 The preparation method of the modified carbon black additive is the same as that in Example 1, except that the amount of γ-aminopropyltriethoxysilane added is 20 mL.

[0054] Preparation Example 3 The preparation method of the modified carbon black additive is the same as that in Example 1, except that the amount of 3-hydroxyphenylphosphonopropionic acid added is 6g.

[0055] Preparation Example 4 The preparation method of the modified carbon black additive is the same as that in Example 1, except that the amount of cyanuric chloride added is 7g.

[0056] Preparation Example 5 The preparation method of the modified carbon black additive is the same as that in Example 1, except that 1,2-epoxyheptane is used instead of 1,2-epoxy-5-hexene in equal mass.

[0057] Preparation Example 6 The preparation method of modified quartz includes the following steps: 10g of quartz, 5g of KH550 silane coupling agent and 300mL of isopropanol are mixed, heated to 90℃ and stirred for 6h, filtered, washed with deionized water and dried to obtain modified quartz.

[0058] Example 1 A wear-resistant, high-temperature resistant, and high-hardness rubber ring comprises the following raw materials in parts by weight: 40 parts hydrogenated nitrile rubber, 32 parts composite reinforcing agent, 4 parts filler, 10 parts EPDM rubber, 10 parts plasticizer, 4 parts zinc oxide, 1 part sulfur, 1 part triphenylphosphine oxide, 0.3 parts paraffin wax, and 0.35 parts antioxidant ODA.

[0059] The composite reinforcing agent is composed of modified carbon black and modified quartz, with a mass ratio of 1:1.5.

[0060] The filler is composed of dolomite and kaolin, with a mass ratio of 1:0.7.

[0061] The plasticizer is composed of trioctyl trimellitate, tert-butylphenyl phosphate and aromatic oil, with a mass ratio of 1:0.2:5.

[0062] The modified carbon black additive was prepared in Preparation Example 1, and the modified quartz was prepared in Preparation Example 6.

[0063] The preparation method of wear-resistant, high-temperature resistant, and high-hardness rubber ring includes the following steps: hydrogenated nitrile rubber, EPDM rubber, composite reinforcing agent, filler, plasticizer, paraffin wax and antioxidant ODA are mixed and kneaded at 80°C for 6 minutes, then zinc oxide, sulfur and triphenylphosphine oxide are added and kneaded at 115°C for 13 minutes, and then extruded into a mold through an extruder to form a wear-resistant, high-temperature resistant, and high-hardness rubber ring after cooling.

[0064] Example 2 A wear-resistant, high-temperature resistant, and high-hardness rubber ring comprises the following raw materials in parts by weight: 30 parts hydrogenated nitrile rubber, 30 parts composite reinforcing agent, 3 parts filler, 5 parts EPDM rubber, 5 parts plasticizer, 2 parts zinc oxide, 0.5 parts sulfur, 0.5 parts triphenylphosphine oxide, 0.1 parts paraffin wax, and 0.3 parts antioxidant ODA.

[0065] The composite reinforcing agent is composed of modified carbon black and modified quartz, with a mass ratio of 1:1.4.

[0066] The filler is composed of dolomite and kaolin, with a mass ratio of 1:0.5.

[0067] The plasticizer is composed of trioctyl trimellitate, tert-butylphenyl phosphate and aromatic oil, with a mass ratio of 1:0.1:4.

[0068] The modified carbon black additive was prepared in Preparation Example 1, and the modified quartz was prepared in Preparation Example 6.

[0069] The preparation method of wear-resistant, high-temperature resistant, and high-hardness rubber ring includes the following steps: hydrogenated nitrile rubber, EPDM rubber, composite reinforcing agent, filler, plasticizer, paraffin wax and antioxidant ODA are mixed and kneaded at 70°C for 8 minutes, then zinc oxide, sulfur and triphenylphosphine oxide are added and kneaded at 100°C for 15 minutes, and then extruded into a mold through an extruder to form a wear-resistant, high-temperature resistant, and high-hardness rubber ring after cooling.

[0070] Example 3 A wear-resistant, high-temperature resistant, and high-hardness rubber ring comprises the following raw materials in parts by weight: 50 parts hydrogenated nitrile rubber, 35 parts composite reinforcing agent, 5 parts filler, 15 parts EPDM rubber, 15 parts plasticizer, 6 parts zinc oxide, 1.5 parts sulfur, 1.5 parts triphenylphosphine oxide, 0.6 parts paraffin wax, and 0.4 parts antioxidant ODA.

[0071] The composite reinforcing agent is composed of modified carbon black and modified quartz, with a mass ratio of 1:1.6.

[0072] The filler is composed of dolomite and kaolin in a mass ratio of 1:1.

[0073] The plasticizer is composed of trioctyl trimellitate, tert-butylphenyl phosphate and aromatic oil, with a mass ratio of 1:0.3:6.

[0074] The modified carbon black additive was prepared in Preparation Example 1, and the modified quartz was prepared in Preparation Example 6.

[0075] The preparation method of wear-resistant, high-temperature resistant, and high-hardness rubber ring includes the following steps: hydrogenated nitrile rubber, EPDM rubber, composite reinforcing agent, filler, plasticizer, paraffin wax and antioxidant ODA are mixed and kneaded at 90°C for 4 min, then zinc oxide, sulfur and triphenylphosphine oxide are added and kneaded at 13°C for 15 min, and then extruded into a mold through an extruder to form a wear-resistant, high-temperature resistant, and high-hardness rubber ring after cooling.

[0076] Example 4 A wear-resistant, high-temperature resistant, and high-hardness rubber ring and its preparation method are disclosed. The specific implementation method is the same as that in Example 1, except that the modified carbon black additive is prepared in Example 2.

[0077] Example 5 A wear-resistant, high-temperature resistant, and high-hardness rubber ring and its preparation method are disclosed. The specific implementation method is the same as in Example 1, except that the modified carbon black additive is prepared by Example 3.

[0078] Example 6 A wear-resistant, high-temperature resistant, and high-hardness rubber ring and its preparation method are disclosed. The specific implementation method is the same as in Example 1, except that the modified carbon black additive is prepared in Example 4.

[0079] Example 7 A wear-resistant, high-temperature resistant, and high-hardness rubber ring and its preparation method are disclosed. The specific implementation method is the same as that in Example 1, except that the modified carbon black additive is prepared by Example 5.

[0080] Example 8 A wear-resistant, high-temperature resistant, and high-hardness rubber ring and its preparation method are disclosed. The specific implementation method is the same as in Example 1, except that an equal mass of carbon black is used instead of modified carbon black additives.

[0081] Example 9 A wear-resistant, high-temperature resistant, and high-hardness rubber ring and its preparation method are disclosed. The specific implementation method is the same as that in Example 1, except that an equal mass of aminated carbon black is used instead of modified carbon black additive; the aminated carbon black is prepared by step S2 in Preparation Example 1.

[0082] Example 10 A wear-resistant, high-temperature resistant, and high-hardness rubber ring and its preparation method are disclosed. The specific implementation method is the same as in Example 1, except that an equal mass of quartz is used instead of modified quartz.

[0083] Performance testing: (1) Hardness: The test shall be conducted in accordance with GB / T 531.1-2008 "Test method for indentation hardness of vulcanized rubber or thermoplastic rubber - Part 1: Shore hardness test (Shore hardness)"; (2) Anti-aging performance: The rubber ring was placed in the Q-LAB ultraviolet aging tester for ultraviolet aging test, with an irradiance of 0.35W / m. 2 The temperature was 70℃, and the irradiation lasted for 1000 hours. The hardness of the aging product was then tested according to method (2). (3) Oxygen index: The test was conducted in accordance with GB / T 10707-1989 "Oxygen Index Method for Determination of Rubber Combustion Performance".

[0084] (4) Abrasion resistance: The abrasion resistance of vulcanized rubber was determined with reference to GB / T1689-2014 "Determination of abrasion resistance of vulcanized rubber (using Akron abrasion tester)".

[0085] Each embodiment and comparative example was tested according to the above method, and the results are shown in Table 1.

[0086] Table 1

[0087] According to the data in Table 1, the rubber rings prepared in Examples 1-3 have good hardness, anti-aging properties, flame retardant properties, and wear resistance. In Example 4, the change in the volume-to-mass ratio of γ-aminopropyltriethoxysilane to pretreated carbon black led to a decrease in the hardness, wear resistance, anti-aging properties, and oxygen index of the rubber ring. In Example 5, the change in the mass ratio of amino-modified carbon black to 3-hydroxyphenylphosphopropionic acid led to an increase in the flame retardant properties of the rubber ring, but a slight decrease in its anti-aging properties, hardness, and wear resistance. In Example 6, the change in the mass ratio of solid product A to cyanuric chloride led to an increase in the hardness, wear resistance, anti-aging properties, and oxygen index of the rubber ring. The hardness and wear resistance decreased, but the anti-aging properties improved. In Example 7, the hardness and wear resistance of the rubber ring decreased significantly due to the replacement of 1,2-epoxyheptane with an equal mass of 1,2-epoxy-5-hexene. In Example 8, the hardness, wear resistance, anti-aging properties, and flame retardant properties of the rubber ring decreased due to the replacement of modified carbon black with an equal mass of carbon black. In Example 9, the hardness, wear resistance, anti-aging properties, and flame retardant properties of the rubber ring decreased due to the replacement of modified carbon black with an equal mass of aminated carbon black. In Example 10, the hardness and wear resistance of the rubber ring decreased due to the replacement of modified quartz with an equal mass of quartz.

[0088] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A wear-resistant, high-temperature-resistant, and high-hardness rubber ring, characterized in that, The raw materials include the following parts by weight: 30-50 parts hydrogenated nitrile rubber, 30-35 parts composite reinforcing agent, 3-5 parts filler, 5-15 parts EPDM rubber, 5-15 parts plasticizer, 2-6 parts activator, 0.5-1.5 parts vulcanizing agent, 0.5-1.5 parts accelerator, 0.1-0.6 parts lubricant, and 0.3-0.4 parts antioxidant.

2. The wear-resistant, high-temperature-resistant, and high-hardness rubber ring according to claim 1, characterized in that, The composite reinforcing agent is composed of modified carbon black and modified quartz, with a mass ratio of 1:(1.4~1.6).

3. The wear-resistant, high-temperature-resistant, and high-hardness rubber ring according to claim 2, characterized in that, The preparation method of the modified carbon black additive includes the following steps: S1. Mix carbon black with an oxidant solution, disperse by ultrasonic stirring, then heat to 75~85℃ and stir for 24~26h, then wash with deionized water and dry to obtain pretreated carbon black; S2. Mix γ-aminopropyltriethoxysilane with an ethanol solution, add the pretreated carbon black obtained in step S1, disperse ultrasonically, heat to reflux and stir for 6-8 hours, wash with anhydrous ethanol after completion, dry to obtain aminated carbon black. S3. Mix the aminoated carbon black obtained in step S2 with the first solvent, cool it to -5~0℃, add 3-hydroxyphenylphosphopropionic acid, then heat it to 65~75℃ and stir it at a constant temperature for 1~3h. After the end, filter it, wash it with anhydrous ethanol, and dry it to obtain solid product A. S4. Mix cyanuric chloride, 2,2,6,6-tetramethylpiperidinamine and di-n-octylamine, add to the second solvent, cool to -5~0℃, then add an acid-binding agent, heat to 40~60℃ and stir at a constant temperature for 6~10h, then add the solid product A obtained in step S3, continue stirring for 6~10h, after which filter, wash with anhydrous ethanol, dry to obtain solid product B; S5. Disperse the solid product B obtained in step S4 in anhydrous ethanol, add 1,2-epoxy-5-hexene, heat to 50~60℃ and stir at a constant temperature for 10~13h, filter, wash with deionized water, and dry to obtain modified carbon black additive.

4. The wear-resistant, high-temperature-resistant, and high-hardness rubber ring according to claim 1, characterized in that, The filler is composed of dolomite and kaolin, with a mass ratio of 1:(0.5~1).

5. The wear-resistant, high-temperature-resistant, and high-hardness rubber ring according to claim 1, characterized in that, The plasticizer is composed of trioctyl trimellitate, tert-butylphenyl phosphate and aromatic oil, with a mass ratio of 1:(0.1~0.3):(4~6).

6. The wear-resistant, high-temperature-resistant, and high-hardness rubber ring according to claim 1, characterized in that, The activator is zinc oxide and / or stearic acid.

7. The wear-resistant, high-temperature-resistant, and high-hardness rubber ring according to claim 1, characterized in that, The vulcanizing agent is sulfur.

8. The wear-resistant, high-temperature-resistant, and high-hardness rubber ring according to claim 1, characterized in that, The accelerator is triphenylphosphine oxide.

9. The wear-resistant, high-temperature-resistant, and high-hardness rubber ring according to claim 1, characterized in that, The lubricant is paraffin wax.

10. A method for preparing a wear-resistant, high-temperature resistant, and high-hardness rubber ring according to any one of claims 1 to 9, characterized in that, The process includes the following steps: mixing hydrogenated nitrile rubber, EPDM rubber, composite reinforcing agent, filler, plasticizer, lubricant and antioxidant at 70~90℃ for 4~8 minutes, then adding activator, vulcanizing agent and accelerator and mixing at 100~130℃ for 10~15 minutes, extruding into a mold through an extruder to form a wear-resistant, high-temperature resistant and high-hardness rubber ring after cooling.

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