High-pressure and high-temperature oil pipe rubber for power steering system and preparation method thereof

Abstract

The invention discloses high-pressure and high-temperature oil pipe rubber for a power steering system and a preparation method of the high-pressure and high-temperature oil pipe rubber. The high-pressure and high-temperature oil pipe rubber for the power steering system comprises the following raw materials in parts by weight: 80-120 parts of nitrile rubber, 4-6 parts of zinc oxide, 6-10 parts of magnesium oxide, 4-9 parts of an anti-aging agent, 1-2 parts of microcrystalline wax, 1-2 parts of stearic acid, 3-5 parts of a dispersing agent, 2-3 parts of an adhesive, 4-6 parts of coumarone, 2-8 parts of a vulcanizing agent, 1-3 parts of a vulcanizing aid, 5-20 parts of a plasticizer and 70-120 parts of filler. The nitrile rubber, the plasticizer and the selected anti-aging agent are adopted, so that the material keeps excellent performance at high temperature and in an oil medium, and the service life of the oil pipe is prolonged. The plasticizer and the filler are reasonably proportioned, so that the material has enough mechanical strength while keeping high flexibility, and can bear mechanical stress in a high-pressure environment. The preparation method is clear in steps, simple and convenient to operate and suitable for large-scale production. The raw materials which are easy to obtain and low in cost are adopted, and the production cost can be effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of rubber materials, and more specifically to a high-pressure and high-temperature oil pipe rubber for a power steering system and a preparation method thereof. Background Art

[0002] High-pressure and high-temperature oil pipe rubber for power steering system is a high-performance rubber material specially designed for vehicle power steering system. This rubber material can work under harsh conditions of high pressure and high temperature to ensure the normal operation of the power steering system. The power steering system is an indispensable part of modern cars. It assists the driver in steering operations through changes in hydraulic pressure, thereby improving driving comfort and safety. As an important component for transmitting hydraulic oil in the power steering system, high-pressure and high-temperature oil pipe rubber must have excellent pressure resistance, temperature resistance, oil resistance and aging resistance.

[0003] The existing high-pressure and high-temperature oil pipe rubber for power steering systems is usually made of composite rubber materials, including but not limited to the following: Hydrogenated nitrile rubber (HNBR): It has excellent oil resistance, high temperature resistance and mechanical properties, and is a widely used oil pipe rubber material. Ethylene propylene diene monomer rubber (EPDM): It has good heat resistance and oxidation resistance, and is suitable for applications in high temperature environments. Fluororubber (FKM): It has excellent high temperature resistance, oil resistance and chemical corrosion resistance, but the cost is relatively high, and it is mainly used in application scenarios with higher requirements. Silicone rubber (VMQ): It has excellent high temperature resistance, but relatively low mechanical strength, and is often used in specific high temperature environments. These materials are usually designed and processed through specific formulas to meet the use requirements of power steering systems. Common processes include rubber mixing, extrusion molding, vulcanization and surface treatment.

[0004] Although the existing high-pressure and high-temperature oil pipe rubber materials for power steering systems have high performance, there are still some technical problems to be solved in practical applications: for example, how to maintain the flexibility and mechanical strength of the material while improving the high temperature resistance, oil resistance and aging resistance is a technical problem. Although high-performance materials such as fluororubber (FKM) have excellent performance, they are relatively expensive. How to find a balance between performance and cost is an important challenge. Summary of the invention

[0005] In view of the deficiencies in the prior art, the first object of the present invention is to provide a high-pressure and high-temperature oil pipe rubber for a power steering system, which can maintain the flexibility and mechanical strength of the material while improving the high temperature resistance, oil resistance and aging resistance.

[0006] The second object of the present invention is to provide a method for preparing high-pressure and high-temperature oil pipe rubber for a power steering system. The preparation method has clear steps, simple operation, is suitable for large-scale production, and the raw materials used are easy to obtain, the cost is low, and it has high economic benefits.

[0007] To achieve the above first object, the present invention provides the following technical solutions: A high-pressure and high-temperature oil pipe rubber for a power steering system comprises the following raw materials in parts by weight: 80-120 parts of nitrile rubber, 4-6 parts of zinc oxide, 6-10 parts of magnesium oxide, 4-9 parts of antioxidant, 1-2 parts of microcrystalline wax, 1-2 parts of stearic acid, 3-5 parts of dispersant, 2-3 parts of adhesive, 4-6 parts of coumarone, 2-8 parts of vulcanizer, 1-3 parts of vulcanizing aid, 5-20 parts of plasticizer and 70-120 parts of filler.

[0008] By adopting the above technical solutions, nitrile rubber (NBR) has excellent high temperature resistance, can maintain stable physical properties in high temperature environment, and extend the service life of the oil pipe. The combination of NBR with zinc oxide and magnesium oxide can make the material show excellent oil resistance when in contact with hydraulic oil, preventing the oil pipe from being damaged by oil erosion. Antioxidants and microcrystalline wax can improve the material's anti-oxidation and anti-aging capabilities, ensuring that the oil pipe is not easy to harden or crack during long-term use. Plasticizers and fillers enable the material to maintain high flexibility while having sufficient mechanical strength to withstand mechanical stress under high pressure environment.

[0009] Further preferably, the raw materials are in parts by weight: 100 parts of nitrile rubber, 5 parts of zinc oxide, 8 parts of magnesium oxide, 7 parts of antioxidant, 2 parts of microcrystalline wax, 2 parts of stearic acid, 4 parts of dispersant, 3 parts of adhesive, 5 parts of coumarone, 5 parts of vulcanizing agent, 2 parts of vulcanizing aid, 15 parts of plasticizer, and 100 parts of filler.

[0010] By adopting the above technical scheme and optimizing the weight of raw materials, the prepared high-pressure and high-temperature oil pipe rubber material for the power steering system achieves a higher balance and optimization in terms of high temperature resistance, oil resistance, aging resistance, mechanical properties and processing properties, so that the comprehensive performance of the final product is significantly improved.

[0011] More preferably, the antioxidant comprises the following parts by weight: 1-2 parts of antioxidant 445, 1-3 parts of antioxidant 4010NA, 1-2 parts of antioxidant RD, and 1-2 parts of antioxidant NBC.

[0012] By adopting the above technical solutions, antioxidant 445 has excellent antioxidant properties, which can effectively prevent rubber materials from oxidative degradation in high temperature environments and extend the service life of the materials. Antioxidant RD can further enhance the antioxidant ability of the material, so that the rubber maintains good physical properties during long-term use. Antioxidant 4010NA has excellent ozone resistance, which can prevent rubber materials from cracking due to ozone erosion during use and maintain the flexibility and mechanical strength of the material. Antioxidant NBC has good thermal stability, which can maintain the stability of the material in a high temperature environment and prevent thermal aging, thereby improving the durability of the oil pipe. The combination of antioxidants 445, 4010NA, RD and NBC enables rubber materials to achieve a good balance in terms of antioxidant, ozone resistance and thermal aging resistance, and significantly improves the comprehensive anti-aging performance of the material. Under high temperature conditions, the material can maintain good physical properties and flexibility and prevent thermal aging.

[0013] More preferably, the dispersant is dispersant PL-60.

[0014] By adopting the above technical solution, dispersant PL-60 has good dispersing performance and can effectively improve the uniformity of the dispersion of fillers in the rubber matrix, thereby improving the uniformity and consistency of the material. Dispersant PL-60 can reduce the viscosity of the rubber during mixing and extrusion, making the processing process smoother, reducing processing resistance and equipment wear, and improving production efficiency. Dispersant PL-60 makes the filler more evenly dispersed in the rubber matrix, reduces local stress concentration, and improves the overall stability and reliability of the material.

[0015] More preferably, the adhesive is adhesive 618B.

[0016] By adopting the above technical solution, adhesive 618B has excellent bonding performance, which can significantly improve the bonding strength between rubber materials and metal parts, ensuring that the oil pipe will not leak or break due to bonding failure during use. Adhesive 618B can maintain good bonding performance under high-frequency use conditions to prevent the bonding layer from breaking due to fatigue.

[0017] More preferably, the vulcanizing agent comprises the following raw materials in parts by weight: 1-4 parts of 2,4-di-tert-butyl peroxide isopropylbenzene (BIBP) and 1-4 parts of N,N'-m-phenylene bismaleimide (PDM).

[0018] By adopting the above technical solutions, BIBP and PDM can increase the cross-linking density of rubber materials, thereby significantly improving the tensile strength, tear strength and wear resistance of rubber. The cross-linking structure formed during the vulcanization process makes the rubber material more resistant to corrosion by hydraulic oil and other chemical media, extending the service life of the material.

[0019] Further preferably, the 2,4-di-tert-butyl cumene peroxide is made from the following raw materials in parts by weight: 200 parts of phenol, 60 parts of acetone, 1-2 parts of sulfur, and 1-3 parts of dicumyl peroxide (DCP).

[0020] By adopting the above technical solution, during the synthesis process of BIBP, sulfur can enhance its vulcanization performance and improve the cross-linking ability of BIBP, so that the rubber material can form a more stable cross-linking structure during the vulcanization process. DCP reacts with phenol and acetone to generate efficient peroxides, further improving the vulcanization efficiency of BIBP and ensuring the uniformity and thoroughness of the vulcanization reaction.

[0021] Further preferably, the preparation method of 2,4-di-tert-butyl cumene peroxide comprises at least the following steps: S51: Phenol and acetone are mixed, sulfur is added, and a condensation reaction occurs under the catalysis of hydrochloric acid to generate a precursor; S52: DCP is added to the precursor, which is decomposed at a temperature of 50-70°C to generate free radicals, thereby initiating and promoting a polymerization reaction to obtain BIBP.

[0022] By adopting the above technical solution, phenol and acetone undergo condensation reaction under the catalysis of sulfur and hydrochloric acid to generate a high-purity precursor, which improves the yield and purity of the precursor and helps the subsequent reaction proceed smoothly. DCP decomposes to generate free radicals to initiate polymerization, which can accurately control the reaction speed and product quality and reduce the generation of by-products.

[0023] More preferably, the N,N'-m-phenylene bismaleimide is made from the following raw materials in parts by weight: 1-2 parts of dimethyl terephthalate (DMT), 1-2 parts of purified terephthalic acid (PMTD), and 1-2 parts of a catalyst.

[0024] By adopting the above technical solution, the use of dimethyl terephthalate (DMT) and purified terephthalic acid (PMTD) can increase the crosslinking density of rubber materials during the vulcanization process, thereby improving the mechanical properties and high temperature resistance of rubber. High-purity PDM can ensure the uniformity of the vulcanization process and improve the overall performance of rubber materials. The catalyst can effectively control the reaction rate, making the synthesis process of PDM more controllable, and the generated PDM has better uniformity and stability.

[0025] More preferably, the plasticizer is plasticizer DOS.

[0026] By adopting the above technical solution, DOS as a plasticizer can effectively increase the flexibility and elasticity of rubber, so that the oil pipe maintains good softness and ductility under high pressure and high temperature environment, thereby improving the processability and application performance of the material. The addition of DOS can reduce the processing viscosity of rubber, making it easier to mold and extrude, thereby improving production efficiency and reducing defects in the processing process. DOS can improve the uniformity of rubber materials, reduce defects inside the material, such as bubbles and uneven hardness distribution, and improve the quality of the final product. Compared with other high-cost plasticizers, DOS has a lower cost, can effectively reduce production costs, and is widely used in the market with good economic benefits.

[0027] More preferably, the plasticizer comprises 50-80 parts of carbon black and 20-40 parts of clay.

[0028] A method for preparing high-pressure and high-temperature oil pipe rubber for a power steering system comprises at least the following steps: S1: Preheat the internal mixer and adjust the temperature to 40-50°C; S2: Add nitrile rubber to the internal mixer, start the internal mixer, press the top bolt, adjust the pressure to 6MPa, adjust the temperature to 50-60°C, and refine for 2min; S3: After step S2 is completed, the internal mixer is turned off, zinc oxide, magnesium oxide, antioxidant, stearic acid, microcrystalline wax, adhesive, and coumarone are added, the temperature is adjusted to 60-65° C., and the refining is performed for 1-2 minutes; S4: After the refining of step S3 is completed, the internal mixer is turned off, carbon black, clay, dispersant, and plasticizer are added, the temperature is adjusted to 60-100° C., and the refining is performed for 4-8 minutes; S5: After the refining of step S4 is completed, the internal mixer is turned off, the vulcanizing agent and the vulcanizing accelerator are added, the temperature is adjusted to 100-110° C., and the refining is performed for 1-2 minutes; S6: Turn on the mixing mill, adjust the temperature to 30-50°C, and adjust the roller distance to 4-7mm; S7: adding the rubber material refined in step S5 to an open mixing mill for refining, and cooling after sheeting.

[0029] By adopting the above technical solution, the preparation method has clear steps, simple operation and is suitable for large-scale production. In addition, the raw materials used are easy to obtain, the cost is low, and it has high economic benefits. Through reasonable formula design and process control, the prepared oil pipe rubber material has excellent high temperature resistance, oil resistance, aging resistance and mechanical properties, meeting the strict requirements of the power steering system. The mixing and vulcanization treatment process is optimized, shortening the production cycle and improving production efficiency.

[0030] In summary, the present invention has the following beneficial effects: Since the present invention adopts nitrile rubber (NBR), plasticizer DOS and selected antioxidant, the material maintains excellent performance in high temperature and oil medium, and prolongs the service life of the oil pipe. The combination of antioxidants 445, 4010NA, RD and NBC enhances the material's anti-oxidation, anti-ozone and anti-thermal aging capabilities, allowing the rubber to maintain good physical properties and flexibility under high temperature conditions. The reasonable ratio of plasticizer DOS and filler enables the material to have sufficient mechanical strength while maintaining high flexibility, and can withstand mechanical stress under high pressure environment. By optimizing the formula of vulcanizers (BIBP and PDM), the cross-linking density of the material is improved, thereby significantly improving the tensile strength, tear strength and wear resistance of the rubber.

[0031] The preparation method of the present invention has clear steps, is easy to operate, and is suitable for large-scale production. Reasonable step arrangement and process optimization reduce the complexity of the production process and improve production efficiency. The use of easily available and low-cost raw materials, such as plasticizer DOS, can effectively reduce production costs. The use of plasticizer DOS not only reduces processing viscosity, but also improves the uniformity of rubber materials, thereby reducing processing defects and improving the quality of the final product. The economy of raw materials and the optimization of the production process improve the overall economic benefits. By reducing production costs and improving production efficiency, the market competitiveness of oil pipe rubber materials is enhanced. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below with reference to the embodiments.

[0033] Example 1: A high-pressure and high-temperature oil pipe rubber for a power steering system, comprising components and their corresponding weight parts as shown in Table 1, and is prepared by the following steps: S1: Preheat the internal mixer and adjust the temperature to 40-50°C; S2: Add nitrile rubber to the internal mixer, start the internal mixer, press the top bolt, adjust the pressure to 6MPa, adjust the temperature to 50-60°C, and refine for 2min; S3: After step S2 is completed, the internal mixer is turned off, zinc oxide, magnesium oxide, antioxidant, stearic acid, microcrystalline wax, adhesive, and coumarone are added, the temperature is adjusted to 60-65° C., and the refining is performed for 1-2 minutes; S4: After the refining of step S3 is completed, the internal mixer is turned off, carbon black, clay, dispersant, and plasticizer are added, the temperature is adjusted to 60-100° C., and the refining is performed for 4-8 minutes; S5: After the refining of step S4 is completed, the internal mixer is turned off, the vulcanizing agent and the vulcanizing accelerator are added, the temperature is adjusted to 100-110° C., and the refining is performed for 1-2 minutes; S6: Turn on the mixing mill, adjust the temperature to 30-50°C, and adjust the roller distance to 4-7mm; S7: adding the rubber material refined in step S5 to an open mixing mill for refining, and cooling after sheeting.

[0034] Table 1 - Example 1 Raw materials by weight Example 2: A high-pressure and high-temperature oil pipe rubber for a power steering system, which differs from Example 1 in that the weight portion of magnesium oxide is 6 parts.

[0035] Example 3: A high-pressure and high-temperature oil pipe rubber for a power steering system, which differs from Example 1 in that the weight portion of magnesium oxide is 10 parts.

[0036] Example 4: A high-pressure and high-temperature oil pipe rubber for a power steering system, which differs from Example 1 in that the weight portion of coumarone is 4 parts.

[0037] Example 5: A high-pressure and high-temperature oil pipe rubber for a power steering system, which differs from Example 1 in that the weight portion of coumarone is 6 parts.

[0038] Example 6: A high-pressure and high-temperature oil pipe rubber for a power steering system, which differs from Example 1 in that the weight portion of the vulcanizing agent is 2 parts.

[0039] Example 7: A high-pressure and high-temperature oil pipe rubber for a power steering system, which differs from Example 1 in that the weight portion of the vulcanizing agent is 8 parts.

[0040] Example 8: A high-pressure and high-temperature oil pipe rubber for a power steering system, which differs from Example 1 in that the weight portion of the plasticizer is 5 parts.

[0041] Example 9: A high-pressure and high-temperature oil pipe rubber for a power steering system, which differs from Example 1 in that the weight portion of the plasticizer is 20 parts.

[0042] Comparative Example: Ordinary rubber, the components included and their corresponding weight parts are shown in Table 2.

[0043] 1. Hardness (Shore A) ASTM D2240: International standard for rubber hardness testing ISO 7619-1: International standard for the determination of hardness of rubber and thermoplastic elastomers 2. Tensile strength GB / T 528-2009 3. Elongation at break GB / T 528-2009 Table 3 - Mechanical properties test table of the examples Combining Table 1, Table 3, and Examples 1-3, it can be seen that when the weight of magnesium oxide exceeds 8 parts, the hardness of the rubber will increase. Because magnesium oxide has a filling effect, increasing its content will make the rubber material harder and reduce the softness of the rubber. When the weight of magnesium oxide is less than 8 parts, the hardness of the rubber will be reduced, making it softer and more elastic. An appropriate amount of magnesium oxide can improve the tensile strength and elongation at break of the rubber. As an active agent, magnesium oxide can enhance the cross-linking density of rubber molecules and improve the overall strength of the material. When the weight of magnesium oxide exceeds 8 parts, the brittleness of the rubber increases, and the tensile strength and elongation at break decrease. Magnesium oxide can improve the thermal stability of the rubber, so that it maintains good physical properties under high temperature conditions. Adding an appropriate amount of magnesium oxide can also improve the oil resistance of the rubber. Magnesium oxide can form a stable cross-linked structure with rubber molecules to reduce the erosion of oil on the rubber. As an antioxidant, magnesium oxide can improve the aging resistance of the rubber and delay the degradation of the rubber in high temperature and oxidative environments.

[0044] In combination with Example 1 and Examples 4-5, it can be seen that when the weight of coumarone exceeds 5 parts, the hardness of the rubber will increase, because coumarone can increase the crosslinking density and cohesion of the rubber, making the material harder. Coumarone less than 5 parts by weight will reduce the hardness of the rubber, making it softer and more elastic. When the weight of coumarone exceeds 5 parts, the tensile strength and elongation at break of the rubber will increase accordingly. Coumarone can enhance the intermolecular forces of the rubber, making the material more difficult to be broken when stretched. Coumarone exceeding 5 parts by weight will cause the rubber to become brittle, and the tensile strength and elongation at break will decrease. Coumarone can improve the thermal stability of the rubber, so that it maintains good physical properties under high temperature conditions. Coumarone can also enhance the crosslinking structure of the rubber and reduce the erosion of the rubber by oil. As an anti-aging agent, coumarone can improve the aging resistance of the rubber and delay the degradation of the rubber under high temperature and oxidative conditions.

[0045] In combination with Example 1 and Examples 6-7, it can be seen that when the weight of the vulcanizing agent exceeds 5 parts, the hardness of the rubber will increase, because more cross-linking points make the material harder and tighter. When the weight of the vulcanizing agent is less than 5 parts, the hardness of the rubber will be reduced, making it softer and more elastic. When the weight of the vulcanizing agent is 5 parts, the tensile strength and elongation at break of the rubber will be improved. More cross-linking points can enhance the intermolecular force of the rubber, making the material more difficult to be broken when stretched. When the weight of the vulcanizing agent exceeds 5 parts, the rubber will become brittle, and the tensile strength and elongation at break will decrease instead.

[0046] In combination with Example 1, and Examples 8-9, it can be seen that when the weight of the plasticizer exceeds 15 parts, the hardness of the rubber will be reduced. This is because the plasticizer makes the rubber softer by reducing the interaction force between molecules. When the weight of the plasticizer is less than 15 parts, the hardness of the rubber will be increased, making it harder and more brittle. When the weight of the plasticizer is 15 parts, the tensile strength and elongation at break of the rubber can be improved, making it less likely to break when stretched. Excessive plasticizer will cause the tensile strength of the rubber to decrease, because too much plasticizer will reduce the interaction force between rubber molecules and weaken its structural strength. When the weight of the plasticizer is 15 parts, the elongation at break of the rubber can be improved, making it more ductile and elastic. Excessive plasticizer will make the rubber too soft, which may cause its elongation at break to decrease because the rubber structure is too loose. The plasticizer can maintain the flexibility of the rubber under high temperature conditions, and can also enhance the oil resistance of the rubber, making it less likely to swell and soften in oil.

[0047] Table 4 - Mechanical properties test table of Example 1 and comparative example Combining Table 1 and Table 4, and combining Example 1 with the comparative example, it can be seen that the hardness of Example 1 at room temperature is slightly higher and within an acceptable range, indicating that its material is harder. The tensile strength of the comparative example is slightly higher, but the difference is not large. The elongation at break of the comparative example is slightly higher, indicating that its material is more flexible at room temperature. Under the hot air aging condition of 135℃48h, the hardness of Example 1 does not increase much, while the hardness of the comparative example increases significantly, indicating that Example 1 can maintain flexibility better at high temperatures. The tensile strength of Example 1 increases, while the tensile strength of the comparative example decreases, indicating that Example 1 still maintains good mechanical strength after high temperature aging. The elongation at break of Example 1 decreases less, while the elongation at break of the comparative example decreases significantly, indicating that Example 1 maintains better ductility after high temperature aging. Under the power steering oil aging condition of 135℃48h, the hardness of the two does not change much, and Example 1 is slightly higher. The tensile strength of Example 1 is significantly higher than that of the comparative example, indicating that Example 1 has better tolerance to power steering oil. The elongation at break of Example 1 is significantly better than that of the comparative example, indicating that it maintains good ductility under the aging conditions of power steering oil. Under the hot air aging conditions of 135℃ for 96h, the hardness of Example 1 increases less, while that of the comparative example increases significantly. Example 1 still maintains a high tensile strength after 96 hours of aging, while the comparative example has become brittle and broken. The elongation at break of Example 1 is still maintained at a high level, while the comparative example cannot withstand the aging conditions and becomes fragile. Under the power steering oil aging conditions of 135℃ for 96h, the hardness of the two does not change much, with Example 1 being slightly lower. Example 1 is significantly higher than the comparative example, indicating that it has better tolerance to power steering oil. Example 1 is significantly better than the comparative example, indicating that it maintains better ductility under the aging conditions of power steering oil.

[0048] The high-pressure and high-temperature oil pipe rubber of Example 1 is superior to ordinary rubber in terms of high-temperature resistance, oil resistance and aging resistance. These performance advantages make it more suitable for use in the high-pressure and high-temperature environment of the power steering system, and can maintain high mechanical strength and flexibility under harsh working conditions, thereby improving the service life and reliability of the oil pipe. In particular, under long-term, high-temperature and oil aging conditions, Example 1 shows significant advantages, ensuring the continued stability and performance of the material.

[0049] The above embodiments are merely explanations of the present invention and are not limitations of the present invention. After reading this specification, those skilled in the art may make modifications to the above embodiments without any creative contribution as needed. However, such modifications are protected by the patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A high-pressure and high-temperature oil pipe rubber for a power steering system, characterized in that: The invention comprises the following raw materials in parts by weight: 80-120 parts of nitrile rubber, 4-6 parts of zinc oxide, 6-10 parts of magnesium oxide, 4-9 parts of antioxidant, 1-2 parts of microcrystalline wax, 1-2 parts of stearic acid, 3-5 parts of dispersant, 2-3 parts of adhesive, 4-6 parts of coumarone, 2-8 parts of vulcanizer, 1-3 parts of vulcanizing aid, 5-20 parts of plasticizer and 70-120 parts of filler.

2. The high-pressure and high-temperature oil pipe rubber for a power steering system according to claim 1, characterized in that: The raw materials are as follows: 100 parts by weight of nitrile rubber, 5 parts by weight of zinc oxide, 8 parts by weight of magnesium oxide, 7 parts by weight of antioxidant, 2 parts by weight of microcrystalline wax, 2 parts by weight of stearic acid, 4 parts by weight of dispersant, 3 parts by weight of adhesive, 5 parts by weight of coumarone, 5 parts by weight of vulcanizing agent, 2 parts by weight of vulcanizing aid, 15 parts by weight of plasticizer and 100 parts by weight of filler.

3. The high-pressure and high-temperature oil pipe rubber for a power steering system according to claim 2, characterized in that: The antioxidant comprises the following raw materials in parts by weight: 1-2 parts of antioxidant 445, 1-3 parts of antioxidant 4010NA, 1-2 parts of antioxidant RD, and 1-2 parts of antioxidant NBC.

4. The high-pressure and high-temperature oil pipe rubber for a power steering system according to claim 2, characterized in that: The vulcanizing agent comprises the following raw materials in parts by weight: 1-4 parts of 2,4-di-tert-butyl peroxide isopropylbenzene (BIBP) and 1-4 parts of N,N'-m-phenylene bismaleimide (PDM).

5. The high-pressure and high-temperature oil pipe rubber for a power steering system according to claim 4, characterized in that: The 2,4-di-tert-butyl cumene peroxide is prepared from the following raw materials in parts by weight: 200 parts of phenol, 60 parts of acetone, 1-2 parts of sulfur, and 1-3 parts of dicumyl peroxide (DCP).

6. The high-pressure and high-temperature oil pipe rubber for a power steering system according to claim 5, characterized in that: The preparation method of 2,4-di-tert-butyl cumene peroxide at least comprises the following steps: S51: Phenol and acetone are mixed, sulfur is added, and a condensation reaction occurs under the catalysis of hydrochloric acid to generate a precursor; S52: DCP is added to the precursor, which is decomposed at a temperature of 50-70°C to generate free radicals, which initiate and promote the polymerization reaction to obtain BIBP.

7. The high-pressure and high-temperature oil pipe rubber for a power steering system according to claim 4, characterized in that: The N,N'-m-phenylene bismaleimide is prepared from the following raw materials in parts by weight: 1-2 parts of dimethyl terephthalate (DMT), 1-2 parts of purified terephthalic acid (PMTD), and 1-2 parts of a catalyst.

8. The high-pressure and high-temperature oil pipe rubber for a power steering system according to claim 2, characterized in that: The plasticizer comprises 50-80 parts of carbon black and 20-40 parts of pottery clay.

9. The method for preparing the high-pressure and high-temperature oil pipe rubber for a power steering system according to any one of claims 1 to 8, characterized in that: At least the following steps are included: S1: Preheat the internal mixer and adjust the temperature to 40-50°C; S2: Add nitrile rubber to the internal mixer, start the internal mixer, press the top bolt, adjust the pressure to 6MPa, adjust the temperature to 50-60°C, and refine for 2min; S3: After step S2 is completed, the internal mixer is turned off, zinc oxide, magnesium oxide, antioxidant, stearic acid, microcrystalline wax, adhesive, and coumarone are added, the temperature is adjusted to 60-65° C., and the mixture is refined for 1-2 min; S4: After the refining of step S3 is completed, the internal mixer is turned off, carbon black, clay, dispersant, and plasticizer are added, the temperature is adjusted to 60-100° C., and the refining is performed for 4-8 minutes; S5: After the refining of step S4 is completed, the internal mixer is turned off, the vulcanizing agent and the vulcanizing accelerator are added, the temperature is adjusted to 100-110° C., and the refining is performed for 1-2 minutes; S6: Turn on the mixing mill, adjust the temperature to 30-50°C, and adjust the roller distance to 4-7mm; S7: adding the rubber material refined in step S5 to an open mixing mill for refining, and cooling after being discharged from the sheet.