High-wear-resistance oil seal and preparation method thereof

Abstract

The invention discloses a high-wear-resistance oil seal and a preparation method thereof, and relates to the technical field of sealing element manufacturing. The fluororubber-silicone rubber composite material comprises the following components: a matrix material: fluororubber and silicone rubber are blended according to a mass ratio of 1: 1, and the total content is 60-80%; through the synergistic effect of the fluororubber and silicone rubber composite matrix, the carbon fiber and glass fiber reinforcement system and the molybdenum disulfide and graphite filler, the mechanical property of the oil seal is remarkably improved: the high-temperature resistance of fluororubber is combined with the low-temperature elasticity of silicone rubber, so that the oil seal keeps stable physical properties; a composite reinforcing system of the carbon fibers and the glass fibers remarkably improves the binding force of the material and a matrix, nano-scale compounding of the molybdenum disulfide and the graphite utilizes the self-lubricating property and the high-hardness characteristic of the molybdenum disulfide and the graphite, the friction coefficient is greatly reduced, and the synergistic effect of the antioxidant and the anti-ultraviolet agent effectively delays the aging process of the material in long-term use, so that the service life of the material is prolonged. And the long-term stability in a complex environment is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of seal manufacturing, and particularly relates to a highly wear-resistant oil seal and a preparation method thereof. Background Art

[0002] As a core component in the field of mechanical seals, the oil seal has become a key barrier to ensure the efficient operation of equipment by virtue of its precise structural design and material innovation. It adopts a multi-layer composite structure, consisting of an oil-resistant rubber matrix, a high-strength fiber skeleton (such as polyester cord or aramid fiber), and a special coating (such as PTFE or nanomaterials). Through dynamic lip contact, a triple sealing system is formed: the static sealing surface provides the initial seal, the spring pre-tightening force maintains the contact pressure (compression amount of 0.02 - 0.1 mm), and the hydrodynamic effect generates a secondary oil film barrier, effectively controlling the leakage probability and blocking pollutants such as dust and water vapor.

[0003] Although the existing oil seal materials have improved wear resistance to a certain extent by adding wear-resistant fillers and reinforcing materials, under long-term high-speed operation and high-load conditions, there are still problems such as excessive wear and short service life. In addition, the anti-aging performance and lubrication performance of traditional oil seal materials also need to be improved. Especially in harsh environments such as high temperature, high humidity, and strong ultraviolet rays, the oil seal is prone to aging and failure, resulting in a decline in sealing performance. Therefore, we provide a highly wear-resistant oil seal and a preparation method thereof to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a highly wear-resistant oil seal and a preparation method thereof. By optimizing the material formula and preparation process, the wear resistance, anti-aging property, and lubrication performance of the oil seal are significantly improved, and its service life is extended, which is applicable to high-speed and high-load mechanical equipment.

[0005] To solve the above technical problems, the present invention is realized through the following technical solutions.

[0006] The present invention provides a highly wear-resistant oil seal and a preparation method thereof, including the following components: Matrix material: Fluororubber and silicone rubber are blended in a mass ratio of 1:1, and the total content is 60% - 80%; Reinforcing material: Carbon fiber and glass fiber are compounded in a mass ratio of 1:1, and the total content is 10% - 20%; Wear-resistant filler: Molybdenum disulfide and graphite are mixed in a mass ratio of 1:1, and the total content is 5% - 10%; Anti-aging agent: Antioxidant (antioxidant 1010) and ultraviolet absorber (ultraviolet light absorber 329) are added in a mass ratio of 1:1, and the total content is 1% - 3%; Lubricant: Polytetrafluoroethylene micropowder is treated by microcapsule coating technology, the coating wall thickness is 10 - 20 nanometers, and the content is 2% - 5%.

[0007] The present invention is further configured such that the particle size distribution of the wear-resistant filler satisfies 3 ± 0.5 microns, and ultrasonic dispersion technology is used to ensure its uniform dispersion in the matrix.

[0008] The present invention is further configured such that the carbon fiber and glass fiber are ultrasonically treated before mixing. The ultrasonic power is 20 kHz, and the treatment time is 10 minutes, so as to form a nano-scale pit structure on the fiber surface. After activation, the shear strength between the fiber and the matrix is increased to 45 N / mm².

[0009] The present invention is further configured such that the hardness of the oil seal is 70 - 90 Shore A, and there is no brittle cracking phenomenon at -40°C.

[0010] A preparation method of a highly wear-resistant oil seal includes the following steps: a. Put fluororubber and silicone rubber into a mixer at a ratio of 1:1, and mix at a speed of 30 rpm for 10 - 20 minutes at 80°C - 100°C to form a uniform premix. Through precise temperature control and low-speed mixing, the rubber compatibility is promoted, and the uniformity of the matrix material is improved; b. Add the ultrasonically activated carbon fiber / glass fiber mixture, and continue to mix at a speed of 40 rpm for 5 - 10 minutes until the fibers are completely dispersed (torque fluctuation < 5%). Nano-pits are formed on the surface of the ultrasonically activated fibers, enhancing the bonding force between the fibers and the matrix, and significantly improving the tensile strength; c. Add the surface-modified molybdenum disulfide / graphite mixture, and continue to mix at a speed of 40 rpm for 5 - 10 minutes. Through dynamic shearing, the filler is evenly embedded in the matrix. The surface-modified filler is evenly dispersed, reducing the agglomeration phenomenon, and effectively improving the wear resistance life and anti-wear ability; d. Add the antioxidant / ultraviolet absorber mixture, and continue to mix at a speed of 30 rpm for 3 - 5 minutes. The dual anti-aging system works synergistically to significantly delay the aging degradation of the material under high temperature and ultraviolet light; e. Add the microcapsule-coated polytetrafluoroethylene micropowder, and continue to mix at a speed of 30 rpm for 3 - 5 minutes to ensure that the microcapsules are intact without rupture. The microencapsulated PTFE gradually releases lubricating components during long-term use, reducing the friction coefficient and extending the service life; f. Inject the mixed rubber compound into a mold and form it by a gradient pressure process at 150°C - 180°C: the initial pressure is 5 MPa and the pressure is maintained for 5 minutes, and the final pressure is 15 - 20 MPa and the pressure is maintained for 10 - 15 minutes, and the density reaches 1.2 g / cm³. The gradient pressure process ensures high-density molding of the material, reduces internal voids, and improves the dimensional stability and sealing reliability; g. Adopt two-stage vulcanization: the first-stage vulcanization is maintained at 160°C ± 5°C for 20 - 25 minutes, and the second-stage vulcanization is maintained at 180°C ± 5°C for 10 - 15 minutes. The crosslinking density reaches 80%. The staged vulcanization balances the crosslinking degree of the rubber, avoids embrittlement caused by over-vulcanization, and ensures the comprehensive mechanical properties of the material; h. Precision polish the vulcanized parts (Ra ≤ 0.8μm) to eliminate burrs and surface defects. The ultra-precision surface treatment reduces the leakage risk and ensures the tight contact of the sealing surface and long-term service life; i. Run the prepared oil seal under the conditions of a load of 10N and a rotational speed of 2000rpm for 500 hours. The wear loss is < 0.1mg, and the leakage rate is < 1×10⁻ 6 mbar·L / s under a pressure of 1.5MPa. After running in a 150°C hot air aging oven for 2000 hours, the tensile strength retention rate is > 80%. The extreme working condition test verifies the ultra-low wear and high-temperature stability of the material, meeting the long-term high-load sealing requirements; j. Pack the qualified oil seal products into moisture-proof aluminum-plastic composite bags, with desiccants inside, and perform radiation sterilization after vacuum sealing. The strict packaging process prevents the material from absorbing moisture and oxidizing, and the radiation sterilization ensures no bacteria and dust, extending the product storage period.

[0011] The present invention is further configured such that the vacuum degree of the mixer in step a is controlled below -0.09MPa to remove volatile components.

[0012] The present invention is further configured such that the surface of the mold for hot pressing in step f is treated with a titanium nitride coating, and the friction coefficient is reduced to below 0.15.

[0013] The present invention is further configured such that in step i, a laser displacement sensor is used to monitor the deformation of the sealing surface during the sealing performance test, and the accuracy reaches 0.1nm.

[0014] The present invention has the following beneficial effects.

[0015] 1. The present invention significantly improves the mechanical properties and extreme environment adaptability of oil seals through the synergistic effects of a fluororubber and silicone rubber composite matrix, a carbon fiber and glass fiber reinforcement system, and molybdenum disulfide and graphite fillers: the high-temperature resistance of fluororubber combined with the low-temperature elasticity of silicone rubber enables the oil seal to maintain stable physical properties within a wide temperature range, breaking through the problem of seal failure caused by temperature changes in traditional materials. The composite reinforcement system of carbon fiber and glass fiber forms a nanoscale surface structure through an ultrasonic treatment process, significantly improving the bonding force between the material and the matrix, thereby enhancing the shear strength and fatigue resistance. The nanoscale compounding of molybdenum disulfide and graphite utilizes their self-lubricating and high-hardness characteristics, greatly reducing the friction coefficient and significantly extending the wear-resistant life compared with traditional materials. The synergistic effects of antioxidants and ultraviolet inhibitors effectively delay the aging process of the material during long-term use, ensuring its long-term stability in complex environments.

[0016] 2. The present invention solves the problems of uneven dispersion and early loss of lubricants in the processing of composite materials through step-by-step mixing, gradient pressure forming, and microcapsule lubrication technology, and has the advantages of efficient production and cost control: the step-by-step mixing strategy ensures the uniform dispersion of each component by precisely controlling the rotation speed and sequence, avoiding fiber breakage or filler agglomeration. The vacuum devolatilization process further removes volatile impurities and improves the forming quality. The gradient pressure hot pressing process reduces internal stress through the reasonable distribution of the initial low pressure and the final pressure, enabling the material density to reach a relatively high level and significantly improving the dimensional stability. The two-stage vulcanization process optimizes the crosslinking density through the scientific matching of temperature and time, taking into account both production efficiency and material properties. The microcapsule coating technology effectively extends the slow-release time of the lubricant, reduces the maintenance frequency, and at the same time reduces material waste during the production process, meeting environmental protection requirements.

[0017] 3. The improved oil seal of the present invention can be widely applied to high-end equipment fields with demanding sealing requirements due to its excellent comprehensive performance. Its leakage rate is extremely low and it can withstand high pressure and severe vibration, meeting the long-term reliable sealing requirements under extreme working conditions. The blend system of fluororubber and silicone rubber reduces the dependence on toxic substances. The reduction of process energy consumption and waste makes it comply with international environmental protection regulations. The surface polishing treatment and dust-proof packaging process further ensure the cleanliness of the product during transportation and storage. Compared with traditional materials, its comprehensive manufacturing cost is lower and its service life is longer, with significant advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments will be briefly introduced below.

[0019] Figure 1 It is a schematic diagram of a highly wear-resistant oil seal.

[0020] Figure 2Schematic diagram of the process of the present invention. Detailed implementation mode

[0021] Next, the technical solutions in the embodiments of the present invention will be described with reference to the accompanying drawings in the embodiments of the present invention. The described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0022] Embodiment 1 Please refer to Figure 1 and Figure 2 , the present invention is a highly wear-resistant oil seal, including the following components: Matrix material: Fluororubber and silicone rubber are blended at a mass ratio of 1:1, and the total content is 60%-80%; Reinforcing material: Carbon fiber and glass fiber are compounded at a mass ratio of 1:1, and the total content is 10%-20%; Wear-resistant filler: Molybdenum disulfide and graphite are mixed at a mass ratio of 1:1, and the total content is 5%-10%; Anti-aging agent: Antioxidant (antioxidant 1010) and ultraviolet absorber (ultraviolet light absorber 329) are added at a mass ratio of 1:1, and the total content is 1%-3%; Lubricant: Polytetrafluoroethylene micropowder is treated by microcapsule coating technology, the coating wall thickness is 10-20 nanometers, and the content is 2%-5%.

[0023] The particle size distribution of the wear-resistant filler satisfies 3±0.5 microns, and ultrasonic dispersion technology is used to ensure its uniform dispersion in the matrix.

[0024] Carbon fiber and glass fiber are treated by ultrasonic waves before mixing. The ultrasonic power is 20 kHz and the treatment time is 10 minutes, so that a nano-pit structure is formed on the fiber surface, and the shear strength between the activated fiber and the matrix is increased to 45 N / mm².

[0025] The hardness of the oil seal is 70-90 Shore A, and there is no brittle fracture phenomenon at -40°C.

[0026] A preparation method of a highly wear-resistant oil seal includes the following steps: a. Put fluororubber and silicone rubber into a mixer at a ratio of 1:1, mix at 80°C - 100°C at a speed of 30 rpm for 10 - 20 minutes to form a uniform premix. Through precise temperature control and low-speed mixing, the rubber compatibility is promoted and the uniformity of the matrix material is improved. The vacuum degree of the mixer is controlled below -0.09 MPa to remove volatile components; b. Add the ultrasonic-activated carbon fiber / glass fiber mixture, and continue to mix at a speed of 40 rpm for 5 - 10 minutes until the fibers are completely dispersed (torque fluctuation < 5%). The ultrasonic activation forms nano-pits on the fiber surface, enhancing the bonding force between the fiber and the matrix and significantly improving the tensile strength; c. Add the surface-modified molybdenum disulfide / graphite mixture and continue to knead at 40 rpm for 5 - 10 minutes. Through dynamic shearing, the filler is evenly embedded in the matrix, the surface-modified filler is evenly dispersed, reducing the agglomeration phenomenon, and effectively improving the wear resistance life and anti-wear ability; d. Add the antioxidant / ultraviolet absorber mixture and continue to knead at 30 rpm for 3 - 5 minutes. The dual anti-aging system acts synergistically to significantly delay the aging degradation of the material under high temperature and ultraviolet light; e. Add the microcapsule-coated polytetrafluoroethylene micro-powder and continue to knead at 30 rpm for 3 - 5 minutes. Ensure that the microcapsules are intact without rupture. The microencapsulated PTFE gradually releases lubricating components during long-term use, reducing the friction coefficient and extending the service life; f. Inject the kneaded rubber compound into the mold and form it by gradient pressure process at 150°C - 180°C: the initial pressure is 5 MPa and kept for 5 minutes, the final pressure is 15 - 20 MPa and kept for 10 - 15 minutes, and the density reaches 1.2 g / cm³. The gradient pressure process ensures high-density forming of the material, reduces internal voids, improves dimensional stability and sealing reliability. The surface of the hot-pressed mold is treated with titanium nitride coating, and the friction coefficient is reduced to less than 0.15; g. Adopt two-stage vulcanization method: the first-stage vulcanization is maintained at 160°C ± 5°C for 20 - 25 minutes, and the second-stage vulcanization is maintained at 180°C ± 5°C for 10 - 15 minutes. The crosslinking density reaches 80%. The staged vulcanization balances the crosslinking degree of the rubber, avoids embrittlement caused by over-vulcanization, and at the same time ensures the comprehensive mechanical properties of the material; h. Precision polish the vulcanized parts (Ra ≤ 0.8 μm) to eliminate burrs and surface defects. The ultra-precision surface treatment reduces the leakage risk and ensures the tight contact of the sealing surface and long-term service life; i. Run the prepared oil seal under the conditions of a load of 10 N and a rotation speed of 2000 rpm for 500 hours, and the wear loss < 0.1 mg. The leakage rate < 1×10⁻ 6 MBAR·L / s under a pressure of 1.5 MPa. After running in a 150°C hot air aging oven for 2000 hours, the tensile strength retention rate > 80%. The extreme working condition test verifies the ultra-low wear and high-temperature stability of the material, meeting the long-term high-load sealing requirements. The sealing performance test uses a laser displacement sensor to monitor the deformation of the sealing surface, with an accuracy of 0.1 nm; j. Pack the qualified oil seal products into moisture-proof aluminum-plastic composite bags, with desiccants inside, and perform radiation sterilization treatment after vacuum sealing. The strict packaging process prevents the material from absorbing moisture and oxidation. Radiation sterilization ensures no bacteria and dust, and extends the product storage period.

[0027] Example 2 Please refer to Figure 1 and Figure 2, on the basis of Example 1, it includes the following components: Matrix material: Fluororubber and silicone rubber are blended at a mass ratio of 1:1, and the total content is 60%-80%; Reinforcing material: Carbon fiber and glass fiber are compounded at a mass ratio of 1:1, and the total content is 10%-20%; Wear-resistant filler: Molybdenum disulfide and graphite are mixed at a mass ratio of 1:1, and the total content is 5%-10%; Anti-aging agent: Antioxidant (antioxidant 1010) and ultraviolet absorber (ultraviolet light absorber 329) are added at a mass ratio of 1:1, and the total content is 1%-3%; Lubricant: Polytetrafluoroethylene micropowder is treated by microcapsule coating technology, the coating wall thickness is 10-20 nanometers, and the content is 2%-5%.

[0028] The particle size distribution of the wear-resistant filler satisfies 3±0.5 microns, and ultrasonic dispersion process is used to ensure its uniform dispersion in the matrix.

[0029] Carbon fiber and glass fiber are treated by ultrasonic wave before mixing. The ultrasonic power is 20kHz and the treatment time is 10 minutes, so that nano-scale pit structures are formed on the fiber surface. After activation, the shear strength between the fiber and the matrix is increased to 45N / mm².

[0030] The hardness of the oil seal is 70-90 Shore A, and there is no brittle fracture phenomenon at -40°C.

[0031] A preparation method of a highly wear-resistant oil seal includes the following steps: a. Put fluororubber and silicone rubber into the internal mixer at a ratio of 1:1, mix at 80°C-100°C at a speed of 30rpm for 10-20 minutes to form a uniform premix. Through precise temperature control and low-speed mixing, the rubber compatibility is promoted and the uniformity of the matrix material is improved. The vacuum degree of the internal mixer is controlled below -0.09MPa to remove volatile components; b. Add the ultrasonic-activated carbon fiber / glass fiber mixture, and continue to mix at a speed of 40rpm for 5-10 minutes until the fibers are completely dispersed (torque fluctuation <5%). The ultrasonic activation forms nano-pits on the fiber surface, enhancing the bonding force between the fiber and the matrix and significantly improving the tensile strength; c. Add the surface-modified molybdenum disulfide / graphite mixture, and continue to mix at a speed of 40rpm for 5-10 minutes. Through dynamic shearing, the filler is uniformly embedded in the matrix, the surface-modified filler is evenly dispersed, the agglomeration phenomenon is reduced, and the wear resistance life and anti-wear ability are effectively improved; d. Add the antioxidant / ultraviolet absorber mixture, and continue to mix at a speed of 30rpm for 3-5 minutes. The dual anti-aging system acts synergistically to significantly delay the aging degradation of the material under high temperature and ultraviolet light; e. Add microencapsulated polytetrafluoroethylene micropowder and continue to knead at a speed of 30 rpm for 3 - 5 minutes to ensure that the microcapsules are intact without rupture. The microencapsulated PTFE gradually releases lubricating components during long-term use, reducing the friction coefficient and extending the service life. f. Inject the kneaded rubber compound into the mold and form it by gradient pressure process at 150°C - 180°C: the initial pressure is 5 MPa and kept for 5 minutes, the final pressure is 15 - 20 MPa and kept for 10 - 15 minutes, and the density reaches 1.2 g / cm³. The gradient pressure process ensures high-density forming of the material, reduces internal voids, improves dimensional stability and sealing reliability. The surface of the mold for hot pressing is treated with titanium nitride coating, and the friction coefficient is reduced to below 0.15. g. Adopt two-stage vulcanization method: the first-stage vulcanization is carried out at 160°C ± 5°C for 20 - 25 minutes, and the second-stage vulcanization is carried out at 180°C ± 5°C for 10 - 15 minutes, and the crosslinking density reaches 80%. The staged vulcanization balances the crosslinking degree of the rubber, avoids embrittlement caused by over-vulcanization, and at the same time ensures the comprehensive mechanical properties of the material. h. Precision polish the vulcanized parts (Ra ≤ 0.8 μm) to eliminate burrs and surface defects. The ultra-precision surface treatment reduces the leakage risk and ensures the tight contact of the sealing surface and long-term service life. i. Run the prepared oil seal under the conditions of a load of 10 N and a speed of 2000 rpm for 500 hours, and the wear loss is < 0.1 mg. The leakage rate is < 1×10⁻ 6 mbar·L / s under a pressure of 1.5 MPa. After running in a 150°C hot air aging oven for 2000 hours, the tensile strength retention rate is > 80%. The extreme working condition test verifies the ultra-low wear and high-temperature stability of the material, meeting the long-term high-load sealing requirements. The sealing performance test uses a laser displacement sensor to monitor the deformation of the sealing surface, with an accuracy of 0.1 nm. j. Pack the qualified oil seal products into moisture-proof aluminum-plastic composite bags, with desiccants inside, and perform irradiation sterilization after vacuum sealing. The strict packaging process prevents the material from absorbing moisture and oxidizing, and the irradiation sterilization ensures sterility and dust-free, extending the product storage period.

[0032] The above-described preferred embodiments of the present invention disclosed are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the present invention, so that those skilled in the relevant technical fields can understand and utilize the present invention well.

Claims

1. A highly wear-resistant oil seal, characterized in that: Includes the following ingredients: Matrix material: Fluororubber and silicone rubber are mixed in a 1:1 mass ratio, with a total content of 60%-80%; Reinforcement material: Carbon fiber and glass fiber are compounded in a 1:1 mass ratio, with a total content of 10%-20%; Wear-resistant filler: Molybdenum disulfide and graphite are mixed in a mass ratio of 1:1, with a total content of 5%-10%; Anti-aging agent: antioxidant (antioxidant 1010) and anti-ultraviolet agent (ultraviolet light absorber 329) are added in a 1:1 mass ratio, with a total content of 1%-3%; Lubricant: Polytetrafluoroethylene powder is processed by microencapsulation technology, the coating wall thickness is 10-20 nanometers, and the content is 2%-5%.

2. A highly wear-resistant oil seal according to claim 1, characterized in that: The particle size distribution of the wear-resistant filler satisfies 3±0.5 microns, and the uniformity of its dispersion in the matrix is ​​ensured by an ultrasonic dispersion process.

3. A highly wear-resistant oil seal according to claim 1, characterized in that: The carbon fiber and glass fiber are treated with ultrasound before mixing, with an ultrasound power of 20kHz and a treatment time of 10 minutes, so that a nano-scale pit structure is formed on the fiber surface. After activation, the shear strength between the fiber and the matrix is ​​increased to 45N / mm².

4. A highly wear-resistant oil seal according to claim 1, characterized in that: The hardness of the oil seal is 70-90 Shore A, and there is no brittle cracking phenomenon at -40°C.

5. A method for preparing a highly wear-resistant oil seal, characterized in that: The following steps are involved: a. Put fluororubber and silicone rubber into an internal mixer at a ratio of 1:1, mix at 80℃-100℃ and 30rpm for 10-20 minutes to form a uniform premix. Through precise temperature control and low-speed mixing, the rubber compatibility is promoted and the uniformity of the base material is improved; b. Add the ultrasonically activated carbon fiber / glass fiber mixture and continue mixing at 40 rpm for 5-10 minutes until the fibers are completely dispersed (torque fluctuation <5%). Ultrasonic activation forms nano-pits on the fiber surface, which enhances the bonding between the fiber and the matrix and significantly improves the tensile strength. c. Add the surface-modified molybdenum disulfide / graphite mixture and continue mixing at 40 rpm for 5-10 minutes. Through dynamic shearing, the filler is evenly embedded in the matrix, the surface-modified filler is evenly dispersed, the agglomeration phenomenon is reduced, and the wear life and anti-wear ability are effectively improved; d. Add the antioxidant / ultraviolet light absorber mixture and continue mixing at 30 rpm for 3-5 minutes. The dual anti-aging system works synergistically to significantly delay the aging and degradation of the material under high temperature and ultraviolet light; e. Add microcapsule-coated polytetrafluoroethylene powder and continue mixing at 30 rpm for 3-5 minutes to ensure that the microcapsules are intact and not broken. The microencapsulated PTFE gradually releases lubricating components during long-term use, reducing the friction coefficient and extending the service life; f. Inject the mixed rubber into the mold and form it at 150℃-180℃ with a gradient pressurization process: initial pressure of 5MPa for 5 minutes, final pressure of 15-20MPa for 10-15 minutes, density reaches 1.2g / cm³, gradient pressurization process ensures high-density molding of materials, reduces internal voids, and improves dimensional stability and sealing reliability; g. Use two-stage vulcanization method: one stage vulcanization at 160℃±5℃ for 20-25 minutes, and the second stage vulcanization at 180℃±5℃ for 10-15 minutes. The crosslinking density reaches 80%. The staged vulcanization balances the crosslinking degree of the rubber to avoid embrittlement caused by excessive vulcanization, while ensuring the comprehensive mechanical properties of the material; h. Precision polishing (Ra≤0.8μm) of vulcanized parts to eliminate burrs and surface defects. Ultra-precision surface treatment reduces leakage risk and ensures tight contact and long service life of the sealing surface; i. The prepared oil seal was run for 500 hours under the conditions of load 10N and speed 2000rpm, and the wear loss was less than 0.1mg, and the leakage rate was less than 1×10⁻ at a pressure of 1.5MPa. 6 MBAR·L / s, after running in a 150℃ hot air aging box for 2000 hours, the tensile strength retention rate is >80%. The extreme working condition test verifies the ultra-low wear and high temperature stability of the material, meeting the long-term high-load sealing requirements; j. The oil seal products that have passed the test are packed into moisture-proof aluminum-plastic composite bags with built-in desiccant, vacuum-sealed and irradiated for sterilization. Strict packaging process is used to prevent the material from absorbing moisture and oxidizing. Irradiation sterilization ensures sterility and dust-free, thus extending the product storage period.

6. The method for preparing a highly wear-resistant oil seal according to claim 5, characterized in that: The vacuum degree of the mixer in step a is controlled below -0.09 MPa to remove volatile components.

7. The method for preparing a highly wear-resistant oil seal according to claim 5, characterized in that: The surface of the hot pressing mold in step f is treated with a titanium nitride coating, and the friction coefficient is reduced to below 0.

15.

8. The method for preparing a highly wear-resistant oil seal according to claim 5, characterized in that: The sealing performance test in step i uses a laser displacement sensor to monitor the deformation of the sealing surface with an accuracy of 0.1 nm.

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