A base material of self-lubricating sliding bearing and its preparation method and application

Abstract

The application relates to a base material of a self-lubricating sliding bearing and a preparation method and application thereof. The base material comprises an A component, a B component and a C component, and the mass ratio of the A component, the B component and the C component is (0.4-0.8):(0.1-0.3):(0.1-0.3); wherein the A component raw material comprises vinyl cyclic siloxane, 1-thioglycerol and methyl acryloyl isocyanate; the B component raw material comprises hexamethylene diisocyanate trimer and 2-hydroxypropyl methacrylate; and the C component raw material comprises diphenyl methane diisocyanate trimer and 2-hydroxypropyl methacrylate. The compression strength and the compression modulus of the base material are higher than those of a commercially available resin, the load-bearing performance of the self-lubricating sliding bearing is greatly improved, the high-crosslinking-degree resin also reduces the wear rate of the bearing, the liner is more wear-resistant, and the service life of the bearing is prolonged.

Description

Technical Field

[0001] This article relates to a self-lubricating sliding bearing, and more specifically to a highly cross-linked matrix material for the self-lubricating sliding bearing, its preparation method, and its application. Background Technology

[0002] Self-lubricating sliding bearings consist of cylindrical inner and outer rings. They are a special type of sliding bearing that requires no additional lubricant. Their characteristics include simple structure, small size, high load-bearing capacity, low coefficient of friction, impact resistance, corrosion resistance, vibration reduction, wide operating temperature range, long service life, and maintenance-free operation without the need for lubricant addition. They are widely used in engineering machinery, heavy-duty trucks, water conservancy facilities, and military machinery. Therefore, in some countries with advanced aerospace industries, research on self-lubricating sliding bearings began early. After years of systematic research and testing, a variety of products suitable for various working conditions have been developed.

[0003] Self-lubricating sliding bearing gaskets, as a material combining load-bearing and self-lubricating properties, effectively solve the friction and wear problems of self-lubricating sliding bearings under harsh working conditions. Self-lubricating gaskets are divided into two types: fabric gaskets and molded gaskets. While their performance is similar, the difference lies in the manufacturing process: fabric gaskets require manual application, resulting in low production efficiency and product quality dependent on operator skill, while molded gaskets can be machine-produced, offering high efficiency and consistent quality. Molded self-lubricating gasket materials generally consist of three parts: a matrix material, reinforcing fillers, and lubricating fillers. The matrix material, as the core component of self-lubricating sliding bearings, requires not only high strength and high modulus but also excellent wear resistance. It is primarily a thermosetting resin material, which is liquid at room temperature and can be cured by heating or ultraviolet light, transforming from a liquid resin into a solid resin. After curing, it possesses both strength and wear resistance. The reinforcing fillers are inorganic fillers with reinforcing properties, such as carbon fiber, glass fiber, and whiskers. Lubricating fillers are generally made of polytetrafluoroethylene, molybdenum disulfide, graphite, etc., which can form a solid lubricating film when the inner and outer rings of a sliding bearing slide relative to each other, thereby reducing resistance and wear.

[0004] However, most existing molded self-lubricating sliding bearing gaskets use common thermosetting resins as their matrix material, such as polyester resin and epoxy resin. Polyester resin is a widely used thermosetting resin material. Unsaturated polyester resins include orthophthalic, isophthalic, terephthalic, bisphenol A, and vinyl ester resins. These resins have relatively low basic strength, with compressive strength between 100-180 MPa. When used as a matrix material, the load-bearing capacity of the gasket is around 100 MPa, which limits the operating conditions of sliding bearings and no longer meets the current aerospace requirements for bearings with high loads, such as 250 MPa and above. Summary of the Invention

[0005] The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of protection of this application.

[0006] To address the load-bearing problem of self-lubricating sliding bearing gaskets, this application provides a matrix material for self-lubricating sliding bearings, its preparation method, and its application, thereby solving the problems of low load-bearing capacity and rapid wear rate of existing self-lubricating sliding bearings, especially molded self-lubricating sliding bearing gaskets.

[0007] The first aspect of this application provides a matrix material for a self-lubricating sliding bearing, the matrix material comprising component A, component B and component C, wherein component A is a main resin, component B is a toughening agent and component C is a reinforcing agent.

[0008] In one exemplary embodiment, the mass ratio of component A, component B, and component C is (0.4-0.8):(0.1-0.3):(0.1-0.3).

[0009] In one exemplary embodiment, the mass ratio of component A, component B, and component C is 0.45:0.2:0.35, 0.5:0.25:0.25, 0.6:0.25:0.15, or 0.7:0.15:0.15.

[0010] In one exemplary embodiment, the raw materials for component A include: vinyl cyclic siloxane, 1-thioglycerol, and methacryloyl isocyanate.

[0011] In one exemplary embodiment, the mass ratio of vinyl cyclic siloxane to 1-thioglycerol in component A is 10:(10-20), preferably 10:(13-15).

[0012] In one exemplary embodiment, the mass ratio of vinyl cyclic siloxane to 1-thioglycerol in component A is 10:13, 10:14, 10:1, or 10:20.

[0013] In one exemplary embodiment, the mass ratio of vinyl cyclic siloxane to methacrylamide is 10:(20-40), preferably 10:(25-30), in component A.

[0014] In one exemplary embodiment, the vinyl cyclic siloxane has the structural formula [CH3(CH2=CH)SiO]n, where n is an integer from 3 to 7; optionally, n is 4.

[0015] In one exemplary embodiment, the raw materials for component B include hexamethylene diisocyanate trimer and 2-hydroxypropyl methacrylate.

[0016] In one exemplary embodiment, the mass ratio of hexamethylene diisocyanate trimer to 2-hydroxypropyl methacrylate in component B is 1:(1-5), preferably 1:(1-3).

[0017] In one exemplary embodiment, the mass ratio of hexamethylene diisocyanate trimer to 2-hydroxypropyl methacrylate in component B is 1:3.3, 1:2, or 1:4.

[0018] In one exemplary embodiment, the mass ratio of diphenylmethane diisocyanate trimer to 2-hydroxypropyl methacrylate in component C is 1:(1-5), preferably 1:(1-3).

[0019] In one exemplary embodiment, the mass ratio of diphenylmethane diisocyanate trimer to 2-hydroxypropyl methacrylate in component C is 1:2, 1:4, or 1:3.33.

[0020] The second aspect of this application provides a method for preparing the matrix material of the above-mentioned self-lubricating sliding bearing, the preparation method comprising: S100. preparation of component A, S200. preparation of component B, S300. preparation of component C, and S400. mixing component A, component B and component C in proportion and uniformly, adding a thermal initiator, heating, and initiating curing to obtain the matrix material of the self-lubricating sliding bearing.

[0021] In one exemplary embodiment, the method includes the following steps: S100. Preparation of component A, including: S101. A vinyl cyclic siloxane reacts with 1-thioglycerol in a click reaction to generate intermediate a; S102. Intermediate product a undergoes an addition reaction with methacryloyl isocyanate to generate component A; S200. Preparation of component B includes: reacting hexamethylene diisocyanate trimer and 2-hydroxypropyl methacrylate to generate component B; The preparation of component C of S300 includes: reacting diphenylmethane diisocyanate trimer and 2-hydroxypropyl methacrylate to generate component C; S400. Mix the components A, B, and C in a specific ratio until homogeneous, add a thermal initiator, heat, and initiate curing to obtain the final product.

[0022] In one exemplary embodiment, step S100 includes: S101. Vinyl cyclic siloxane and 1-thioglycerol are added to an organic solvent, and a UV free radical initiator is added. Under UV irradiation and an inert atmosphere, a click reaction occurs to generate intermediate product a. S102. The intermediate product a and methacryloyl isocyanate undergo an addition reaction under an inert atmosphere with the aid of a catalyst and a polymerization inhibitor; the reaction product is then distilled under reduced pressure to obtain the main resin.

[0023] In one exemplary embodiment, step S100 further includes: S103. In use, the thermal initiator is added to the product obtained in step S102, and the product is cured by thermal initiation under heating conditions.

[0024] In one exemplary embodiment, in step S103, the heating temperature is 60-130°C.

[0025] In one exemplary embodiment, steps S200 and S300 respectively include: Hexamethylene diisocyanate trimer and diphenylmethane diisocyanate trimer were reacted with 2-hydroxypropyl methacrylate and a catalyst under an inert atmosphere. After the reaction was completed, the unreacted 2-hydroxypropyl methacrylate was removed by vacuum distillation to obtain toughening agent and reinforcing agent, respectively.

[0026] In one exemplary embodiment, in step S101, the organic solvent is selected from one or more of tetrahydrofuran, N,N-dimethylformamide, dimethyl sulfoxide, acetone, ethanol, methanol, n-butanol, toluene, and xylene; optionally, the organic solvent is toluene.

[0027] In one exemplary embodiment, in step S101, the ultraviolet radical initiator is selected from any one or more of diphenyl hydroxyethyl ketone, acetophenone, benzoyl dimethyl ketal, and benzophenone.

[0028] In one exemplary embodiment, in step S102, the polymerization inhibitor is selected from any one or more of hydroquinone, bisphenol A, p-tert-butylcatechol, and 2,6-di-tert-butyl-p-methylphenol.

[0029] In an exemplary embodiment, in steps S102, S200 and S300, the catalyst is dibutyltin dilaurate.

[0030] In one exemplary embodiment, the thermal initiator in the method is selected from any one or more of benzoyl peroxide, butanone peroxide, and tert-butyl peroxide.

[0031] In one exemplary embodiment, in step S103, the thermal initiator is benzoyl peroxide or butanone peroxide.

[0032] In one exemplary embodiment, in step S400, the thermal initiator is selected from any one or more of benzoyl peroxide, butanone peroxide, and tert-butyl peroxide.

[0033] In an exemplary embodiment, in step S100, the mass ratio of the vinyl cyclic siloxane to the organic solvent is 10:(20-100), preferably 10:(40-60).

[0034] In one exemplary embodiment, in step S100, the mass ratio of the vinyl cyclic siloxane to the organic solvent is 10:50, 10:55, 10:20, or 1:100.

[0035] In an exemplary embodiment, in step S100, the mass ratio of the vinyl cyclic siloxane to the ultraviolet radical initiator is 10:(0.2-0.8), preferably 10:(0.3-0.5).

[0036] In one exemplary embodiment, in step S100, the mass ratio of the vinyl cyclic siloxane to the ultraviolet radical initiator is 10:0.4, 10:0.35, 10:0.2, or 10:0.8.

[0037] In an exemplary embodiment, in step S100, the mass ratio of the vinyl cyclic siloxane to the catalyst is 10:(0.1-0.8), preferably 10:(0.2-0.5).

[0038] In one exemplary embodiment, in step S100, the mass ratio of the vinyl cyclic siloxane to the catalyst is 10:0.2, 10:0.5, 10:0.1, or 10:0.8.

[0039] In an exemplary embodiment, in step S100, the mass ratio of the vinyl cyclic siloxane to the polymerization inhibitor is 10:(0.1-0.8), preferably 10:(0.2-0.5).

[0040] In one exemplary embodiment, in step S100, the mass ratio of the vinyl cyclic siloxane to the polymerization inhibitor is 10:0.2, 10:0.5, 10:0.1, or 10:0.8.

[0041] In one exemplary embodiment, in step S101, the reaction temperature is 30-60°C, preferably 40-50°C.

[0042] In one exemplary embodiment, in step S101, the reaction time is 3-10 hours, preferably 4-6 hours.

[0043] In one exemplary embodiment, in step S101, the reaction temperature is 40°C and the reaction time is 5 hours; or The reaction temperature is 45℃, and the reaction time is 5 hours; or The reaction temperature is 30℃, and the reaction time is 3 hours; or The reaction temperature was 60℃ and the reaction time was 10h.

[0044] In one exemplary embodiment, the reaction temperature in step S102 is 60-90°C.

[0045] In one exemplary embodiment, in step S102, the reaction time is 3-12 hours.

[0046] In one exemplary embodiment, in step S102, the reaction temperature is 70°C and the reaction time is 5 hours; or The reaction temperature is 80℃, and the reaction time is 7 hours; or The reaction temperature is 60℃, and the reaction time is 3 hours; or The reaction temperature was 90℃ and the reaction time was 12h.

[0047] In one exemplary embodiment, in step S102, the vacuum distillation temperature is 55-85°C and the time is 7-20 hours.

[0048] In one exemplary embodiment, in steps S200 and S300, the amount of catalyst added is 0.05wt%-1wt%; optionally, it is 0.2wt%.

[0049] In one exemplary embodiment, the reaction temperature in steps S200 and S300 is 60-90°C; preferably, it is 70°C.

[0050] In one exemplary embodiment, the reaction time in steps S200 and S300 is 3-10 hours, preferably 4-6 hours.

[0051] In one exemplary embodiment, in steps S200 and S300, the reaction temperature is 70°C and the reaction time is 5 hours.

[0052] In one exemplary embodiment, in steps S200 and S300, the vacuum distillation temperature is 55-85°C and the time is 7-20 hours; preferably, the vacuum distillation temperature is 80°C and the time is 7 hours.

[0053] In one exemplary embodiment, the amount of thermal initiator added in the method is 0.05 wt%-1 wt%, preferably 0.2 wt%-0.5 wt%.

[0054] In one exemplary embodiment, in step S103, the thermal initiation temperature is 60-130°C.

[0055] In one exemplary embodiment, in step S400, the temperature for thermal initiation is 50-150°C, and the reaction time is 5-20 hours.

[0056] In one exemplary embodiment, the inert atmosphere in the method is a nitrogen atmosphere.

[0057] In one exemplary embodiment, when n is 4, step S100 includes: S101. Tetramethyltetravinylcyclotetrasiloxane (V4D4) undergoes a click reaction with 1-thioglycerol, as shown in the following reaction formula. ; S102, the product from step S101 undergoes an addition reaction with methacryloyl isocyanate to generate the main resin, as shown in the following reaction formula. .

[0058] In one exemplary embodiment, step S200 includes the following steps: Hexamethylene diisocyanate trimer, 2-hydroxypropyl methacrylate, and dibutyltin dilaurate catalyst were reacted under continuous stirring at 70°C and a nitrogen atmosphere. After the reaction was completed, the unreacted 2-hydroxypropyl methacrylate was removed by vacuum distillation to obtain the toughening agent. The reaction formula is as follows: .

[0059] In one exemplary embodiment, step S300 includes the following steps: Diphenylmethane diisocyanate trimer, 2-hydroxypropyl methacrylate, and dibutyltin dilaurate catalyst were reacted under continuous stirring at 70°C and a nitrogen atmosphere. After the reaction was completed, vacuum distillation was performed to remove unreacted 2-hydroxypropyl methacrylate to obtain the reinforcing agent. The reaction formula is as follows: .

[0060] The third aspect of this application provides a matrix material for a self-lubricating sliding bearing prepared by the above method.

[0061] In one exemplary embodiment, a polymerization inhibitor is added to the matrix material during storage to prevent resin curing.

[0062] In one exemplary embodiment, the polymerization inhibitor is selected from any one of hydroquinone, bisphenol A, p-tert-butylcatechol, and 2,6-di-tert-butyl-p-methylphenol; optionally, the polymerization inhibitor is hydroquinone.

[0063] In one exemplary embodiment, the amount of the polymerization inhibitor added is 0.2 wt%-0.5 wt%; optionally, it is 0.5 wt%.

[0064] The fourth aspect of this application provides a gasket for a self-lubricating sliding bearing made from the matrix material of the aforementioned self-lubricating sliding bearing.

[0065] In one exemplary embodiment, the gasket is a gasket for a molded self-lubricating sliding bearing.

[0066] The fifth aspect of this application provides a method for preparing an organosilicon resin, comprising: Vinylcyclic siloxanes react with 1-thioglycerol via a click reaction to generate intermediate a; Intermediate product a undergoes an addition reaction with methacryloyl isocyanate to generate organosilicon resin.

[0067] The sixth aspect of this application provides an organosilicon resin prepared by the above method.

[0068] In one exemplary embodiment, the silicone resin is used by adding a thermal initiator and curing it under heating conditions; during storage, a polymerization inhibitor is added to prevent curing.

[0069] Compared with existing related technologies, this application has the following technical effects: This application provides a matrix material for a highly cross-linked self-lubricating sliding bearing, its preparation method, and its application. The compressive strength and compressive modulus of the matrix material are higher than those of commercially available resins, which greatly improves the load-bearing performance of the self-lubricating sliding bearing. At the same time, the highly cross-linked resin also reduces the wear rate of the bearing, making the gasket more wear-resistant and extending the service life of the bearing. Moreover, the preparation process of the matrix material is simple, and it can be mass-produced, which has significant application value.

[0070] Other features and advantages of this application will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the application. Other advantages of this application can be realized and obtained by means of the embodiments described in the description and the accompanying drawings. Attached Figure Description

[0071] The accompanying drawings are used to provide an understanding of the technical solutions of this application and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of this application and do not constitute a limitation on the technical solutions of this application.

[0072] Figure 1 This is a compression test curve of the matrix material in Example 1; Figure 2 Compression test curves for commercially available polyester resin 901 material; Figure 3 The wear rate test results are for the bearings prepared in Examples 1-4 and the bearings prepared with polyester resin 901. Detailed Implementation

[0073] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0074] The raw materials used in this application are all conventional products on the market.

[0075] Unless otherwise specified, all materials and reagents used in the embodiments of this invention are commercially available.

[0076] Experimental methods not specified in the examples are generally performed under standard conditions or as recommended by the manufacturer.

[0077] Example 1: Preparation of component A: Weigh 10g of tetramethyltetravinylcyclotetrasiloxane, 13g of 1-thioglycerol, and 50g of toluene, stir well, add 0.35g of diphenylhydroxyethyl ketone, and stir for 5h at 40℃ under ultraviolet light and nitrogen atmosphere to produce intermediate product a.

[0078] 25 g of methacryloyl isocyanate, 0.2 g of dibutyltin dilaurate, and 0.2 g of hydroquinone were added to intermediate product a. The mixture was stirred continuously at 70 °C under a nitrogen atmosphere for 5 h, after which the reaction was terminated. The reaction product was then subjected to rotary evaporation at 80 °C for 7 h.

[0079] When using, add 0.2 wt% of the thermal initiator benzoyl peroxide to the product to initiate curing at a temperature of 80°C. When storing, add 0.5 wt% of the polymerization inhibitor hydroquinone to the product to prevent resin curing.

[0080] Preparation of component B: Weigh 6g of hexamethylene diisocyanate trimer and 20g of 2-hydroxypropyl methacrylate, add 0.2wt% dibutyltin dilaurate, and continuously stir at 70℃ under a nitrogen atmosphere. Terminate the reaction after 5 hours. Perform rotary evaporation on the reaction product at 80℃ for 7 hours.

[0081] Preparation of component C: Weigh 10g of diphenylmethane diisocyanate trimer and 20g of 2-hydroxypropyl methacrylate, add 0.2wt% dibutyltin dilaurate, and continuously stir at 70℃ under a nitrogen atmosphere. Terminate the reaction after 5 hours. Perform rotary evaporation on the reaction product at 80℃ for 7 hours.

[0082] When using, mix components A, B, and C evenly in a mass ratio of 0.45:0.2:0.35, and add 0.2 wt% of the thermal initiator benzoyl peroxide to initiate curing at 80°C. During storage, add 0.5 wt% of the polymerization inhibitor hydroquinone to the product to prevent resin curing.

[0083] Example 2: Preparation of component A: Weigh out 10g of tetramethyltetravinylcyclotetrasiloxane, 14g of 1-thioglycerol, and 55g of toluene, stir well, add 0.4g of acetophenone, and stir at 45℃ under ultraviolet light and nitrogen atmosphere for 5h to generate an intermediate product. Add 25g of methacryloyl isocyanate, along with 0.5g of dibutyltin dilaurate and 0.5g of bisphenol A, and stir continuously at 80℃ under nitrogen atmosphere for 7h to terminate the reaction. Perform rotary evaporation on the reaction product at 65℃ for 15h.

[0084] When using, adding 0.5 wt% of the thermal initiator methyl ethyl ketone peroxide to the product can initiate curing at a temperature of 100°C. When storing, adding 0.4 wt% of the polymerization inhibitor bisphenol A to the product can prevent the resin from curing.

[0085] Preparation of component B: Weigh 10g of hexamethylene diisocyanate trimer and 20g of 2-hydroxypropyl methacrylate, add 0.2wt% dibutyltin dilaurate, and continuously stir at 70℃ under a nitrogen atmosphere. Terminate the reaction after 5 hours. Perform rotary evaporation on the reaction product at 80℃ for 7 hours.

[0086] Preparation of component C: Weigh 10g of diphenylmethane diisocyanate trimer and 20g of 2-hydroxypropyl methacrylate, add 0.2wt% dibutyltin dilaurate, and continuously stir at 70℃ under a nitrogen atmosphere. Terminate the reaction after 5 hours. Perform rotary evaporation on the reaction product at 80℃ for 7 hours.

[0087] When using, mix components A, B, and C evenly in a mass ratio of 0.5:0.25:0.25, and add 0.2 wt% of the thermal initiator benzoyl peroxide to initiate curing at 80°C. During storage, add 0.5 wt% of the polymerization inhibitor hydroquinone to the product to prevent resin curing.

[0088] Example 3: Preparation of component A: Weigh 10g of tetramethyltetravinylcyclotetrasiloxane, 10g of 1-thioglycerol, and 20g of toluene, stir well, add 0.2g of benzoyldimethyl ketal, and stir for 3 hours at 30℃ under ultraviolet light and nitrogen atmosphere to produce an intermediate product.

[0089] 20 g of methacryloyl isocyanate, along with 0.1 g of dibutyltin dilaurate and 0.1 g of p-tert-butylcatechol, were added to the intermediate product. The mixture was stirred continuously at 60 °C under a nitrogen atmosphere for 3 h, after which the reaction was terminated. The reaction product was then subjected to rotary evaporation at 55 °C for 20 h.

[0090] When using, adding 0.05 wt% of the thermal initiator benzoyl peroxide to the product can initiate curing at a temperature of 130°C. When storing, adding 0.05 wt% of the polymerization inhibitor p-tert-butylcatechol to the product can prevent resin curing.

[0091] Preparation of component B: Weigh 5g of hexamethylene diisocyanate trimer and 20g of 2-hydroxypropyl methacrylate, add 0.2wt% dibutyltin dilaurate, and continuously stir at 70℃ under a nitrogen atmosphere. Terminate the reaction after 5 hours. Perform rotary evaporation on the reaction product at 80℃ for 7 hours.

[0092] Preparation of component C: Weigh 5g of diphenylmethane diisocyanate trimer and 20g of 2-hydroxypropyl methacrylate, add 0.2wt% dibutyltin dilaurate, and continuously stir at 70℃ under a nitrogen atmosphere. Terminate the reaction after 5 hours. Perform rotary evaporation on the reaction product at 80℃ for 7 hours.

[0093] When using, mix components A, B, and C evenly in a mass ratio of 0.6:0.25:0.15, and add 0.2 wt% of the thermal initiator benzoyl peroxide to initiate curing at 80°C. During storage, add 0.5 wt% of the polymerization inhibitor hydroquinone to the product to prevent resin curing.

[0094] Example 4: Preparation of component A: Weigh 10g of tetramethyltetravinylcyclotetrasiloxane, 20g of 1-thioglycerol, and 100g of toluene, stir well, add 0.8g of benzophenone, and stir for 10h at 60℃ under ultraviolet light and nitrogen atmosphere to produce an intermediate product.

[0095] 40 g of methacryloyl isocyanate, along with 0.8 g of dibutyltin dilaurate and 0.8 g of 2,6-di-tert-butyl-p-methylphenol, were added to the intermediate product. The mixture was stirred continuously at 90 °C under a nitrogen atmosphere, and the reaction was terminated after 12 h. The reaction product was then subjected to rotary evaporation at 85 °C for 20 h.

[0096] When using, add 1 wt% of the thermal initiator benzoyl peroxide to the product to initiate curing at a temperature of 60°C. When storing, add 1 wt% of the polymerization inhibitor 2,6-di-tert-butyl-p-methylphenol to the product to prevent resin curing.

[0097] Preparation of component B: Weigh 3g of hexamethylene diisocyanate trimer and 10g of 2-hydroxypropyl methacrylate, add 0.2wt% dibutyltin dilaurate, and continuously stir at 70℃ under a nitrogen atmosphere. Terminate the reaction after 5 hours. Perform rotary evaporation on the reaction product at 80℃ for 7 hours.

[0098] Preparation of component C: Weigh 6g of diphenylmethane diisocyanate trimer and 10g of 2-hydroxypropyl methacrylate, add 0.2wt% dibutyltin dilaurate, and continuously stir at 70℃ under a nitrogen atmosphere. Terminate the reaction after 5 hours. Perform rotary evaporation on the reaction product at 80℃ for 7 hours.

[0099] When using, mix components A, B, and C evenly in a mass ratio of 0.7:0.15:0.15, and add 0.2 wt% of the thermal initiator benzoyl peroxide to initiate curing at 80°C. During storage, add 0.5 wt% of the polymerization inhibitor hydroquinone to the product to prevent resin curing.

[0100] test: 1. The matrix material obtained in Example 1 and the commercially available polyester resin 901 material were subjected to compression tests according to GB / T 1041-2008 standard. The results are shown in [the table below]. Figure 1 and Figure 2 The compressive strength of the matrix material obtained in Example 1 was 318 MPa and the compressive modulus was 2.39 GPa, which was much higher than that of commercially available polyester resin 901; while the compressive strength of commercially available polyester resin 901 was 112 MPa and the compressive modulus was 0.96 GPa, which were lower in strength and modulus.

[0101] 2. Wear rate tests were conducted on Examples 1-4 and commercially available polyester resin 901. The method involved using a ball-disc contact mode on a UMT tribometer for quantitative wear testing. The tests were performed at room temperature and under dry conditions. Key parameters included: a 3 N normal load, a sliding speed of 20 mm / s, a total wear track length of 5 mm, and a test duration of 30 min. Wear morphology was measured non-contactly using a white light interferometer for three-dimensional measurement. The volumetric loss of the wear track was calculated by extracting the three-dimensional morphology data of the wear track cross-section. Finally, the wear rate was determined according to the Archard wear calculation formula Γ = V / (F × S), where V is the wear volume (mm²). 3 F is the normal load (N), and S is the total sliding distance (m). The results are shown in [reference needed]. Figure 3 .according to Figure 3 It is evident that the wear rate of each embodiment in this application is significantly lower than that of existing resins.

[0102] In summary, this application provides a matrix material for a highly cross-linked self-lubricating sliding bearing, its preparation method, and its application. The compressive strength and compressive modulus of the matrix material are higher than those of commercially available resins, which greatly improves the load-bearing performance of the self-lubricating sliding bearing. At the same time, the highly cross-linked resin also reduces the wear rate of the bearing, making the gasket more wear-resistant and extending the service life of the bearing. Furthermore, the preparation process of the matrix material is simple and can be mass-produced, thus having significant application value.

[0103] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A matrix material for a self-lubricating sliding bearing, the matrix material comprising component A, component B, and component C, wherein the mass ratio of component A, component B, and component C is (0.4-0.8):(0.1-0.3):(0.1-0.3); wherein, The raw materials for component A include: vinyl cyclic siloxane, 1-thioglycerol, and methacryloyl isocyanate; The raw materials for component B include: hexamethylene diisocyanate trimer and 2-hydroxypropyl methacrylate; The raw materials for component C include: diphenylmethane diisocyanate trimer and 2-hydroxypropyl methacrylate; In component A, the mass ratio of vinyl cyclic siloxane to 1-thioglycerol is 10:(10-20), and the mass ratio of vinyl cyclic siloxane to methacrylisocyanate is 10:(20-40). In component B, the mass ratio of hexamethylene diisocyanate trimer to 2-hydroxypropyl methacrylate is 1:(1-5); In component C, the mass ratio of diphenylmethane diisocyanate trimer to 2-hydroxypropyl methacrylate is 1:(1-5).

2. The matrix material according to claim 1, wherein, The structural formula of the vinyl cyclic siloxane is [CH3(CH2=CH)SiO]n, where n is an integer from 3 to 7.

3. The matrix material according to claim 2, wherein, n is 4.

4. A method for preparing the matrix material of a self-lubricating sliding bearing according to any one of claims 1 to 3, the method comprising the following steps: S100. Preparation of component A, including: S101. A vinyl cyclic siloxane reacts with 1-thioglycerol in a click reaction to generate intermediate a; S102. Intermediate product a undergoes an addition reaction with methacryloyl isocyanate to generate component A; S200. Preparation of component B includes: reacting hexamethylene diisocyanate trimer and 2-hydroxypropyl methacrylate to generate component B; The preparation of component C of S300 includes: reacting diphenylmethane diisocyanate trimer and 2-hydroxypropyl methacrylate to generate component C; S400. Mix the components A, B, and C in a specific ratio until homogeneous, add a thermal initiator, heat, and initiate curing to obtain the matrix material for the self-lubricating sliding bearing.

5. The method according to claim 4, wherein, Step S100 includes: S101. Vinyl cyclic siloxane and 1-thioglycerol are added to an organic solvent, and a UV free radical initiator is added. Under UV irradiation and an inert atmosphere, a click reaction occurs to generate intermediate product a. S102. The intermediate product a and methacryloyl isocyanate undergo an addition reaction under an inert atmosphere with the aid of a catalyst and a polymerization inhibitor; the reaction product is then distilled under reduced pressure to obtain the main resin. Steps S200 and S300 respectively include: Hexamethylene diisocyanate trimer and diphenylmethane diisocyanate trimer were reacted with 2-hydroxypropyl methacrylate and a catalyst under an inert atmosphere. After the reaction was completed, the mixture was distilled under reduced pressure to obtain a toughening agent and a reinforcing agent, respectively.

6. The method according to claim 5, wherein, In step S101, the organic solvent is selected from any one or more of tetrahydrofuran, N,N-dimethylformamide, dimethyl sulfoxide, acetone, ethanol, methanol, n-butanol, toluene, and xylene; and / or In step S101, the ultraviolet radical initiator is selected from any one or more of diphenylhydroxyethyl ketone, acetophenone, benzoyl dimethyl ketal, and benzophenone; and / or In step S102, the polymerization inhibitor is selected from any one or more of hydroquinone, bisphenol A, p-tert-butylcatechol, and 2,6-di-tert-butyl-p-methylphenol; and / or In steps S102, S200, and S300, the catalyst is dibutyltin dilaurate; and / or In step S400, the thermal initiator is selected from any one or more of benzoyl peroxide, butanone peroxide, and tert-butyl peroxide.

7. The method according to claim 5, wherein, In step S100, the mass ratio of the vinyl cyclic siloxane to the organic solvent is 10:(20-100); and / or In step S100, the mass ratio of the vinyl cyclic siloxane to the ultraviolet radical initiator is 10:(0.2-0.8); and / or In step S100, the mass ratio of the vinyl cyclic siloxane to the catalyst is 10:(0.1-0.8); and / or In step S100, the mass ratio of the vinyl cyclic siloxane to the polymerization inhibitor is 10:(0.1-0.8); and / or In steps S200 and S300, the amount of catalyst added is 0.05wt%-1wt%; and / or In step S400, the amount of thermal initiator added is 0.05 wt%-1 wt%.

8. The method according to any one of claims 5 to 7, wherein, In step S101, the reaction temperature is 30-60℃, and the reaction time is 3-10h; and / or In step S102, the reaction temperature is 60-90℃, and the reaction time is 3-12h; and / or In steps S200 and S300, the reaction temperature is 60-90℃, and the reaction time is 3-10h; and / or In step S400, the thermal initiation temperature is 50-150℃, and the reaction time is 5-20h; and / or In the method, the inert atmosphere is a nitrogen atmosphere.

9. A matrix material for a self-lubricating sliding bearing prepared by the method according to any one of claims 4 to 8.

10. A self-lubricating sliding bearing liner made from the matrix material of the self-lubricating sliding bearing according to any one of claims 1 to 3 and 9; Optionally, the gasket is a molded self-lubricating sliding bearing gasket.

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