A self-lubricating wear-resistant composite material for building seismic isolation bearings and its preparation method

Abstract

This invention relates to the field of sliding materials for seismic isolation bearings, specifically disclosing a self-lubricating wear-resistant composite material for building seismic isolation bearings and its preparation method. The self-lubricating wear-resistant composite material for building seismic isolation bearings comprises the following raw material components: aliphatic polyketone, polytetrafluoroethylene, high-styrene resin modified methyl vinyl silicone rubber, silicone resin, solid lubricating particles, silicone oil, compatibilizer, antioxidant, stabilizer, and coupling agent; the raw material components of the solid lubricating particles include tungsten disulfide and hexagonal boron nitride. The self-lubricating wear-resistant composite material for building seismic isolation bearings prepared by this invention can maintain a low and stable coefficient of friction and excellent wear resistance over a long period, significantly reducing dependence on external lubricating grease, and solving the technical problems of rapid decay of self-lubricating performance, frequent maintenance, and high cost of existing bearing materials.

Description

Technical Field

[0001] This invention relates to the field of sliding materials for seismic isolation bearings, and more particularly to a self-lubricating wear-resistant composite material for building seismic isolation bearings and its preparation method. Background Technology

[0002] Existing bridge bearings generally achieve vertical load-bearing, rotational and horizontal displacement caused by temperature deformation, shrinkage, and creep through the shear deformation of the rubber layer and the relative movement of the sliding interface. To limit additional internal forces such as temperature forces and braking forces, relevant specifications usually require the bearing friction coefficient to be within a low and relatively stable range. This dictates that the bearing material must possess good friction-reducing and self-lubricating properties. Traditional solutions often rely on external application of grease, graphite paste, etc., to form a lubricating film. However, under long-term high contact pressure, reciprocating micro-slippage, and the influence of rainwater, dust, and de-icing salt, the external lubricant is easily squeezed out or contaminated and ineffective, leading to a gradual increase in the friction coefficient. This hinders bearing slippage, resulting in a "stick-slip" phenomenon, which amplifies the internal forces caused by temperature displacement. In severe cases, it can cause bearing creep, jamming, or even cracking and damage to the superstructure. On the other hand, frequent replenishment of grease not only increases maintenance costs but also poses an environmental risk of leakage and pollution of concrete and water bodies. Therefore, the design of existing bridge bearing materials increasingly emphasizes the continuous and stable self-lubricating ability of the material itself. That is, under the condition of not relying on or relying on external lubricants, the material maintains a low coefficient of friction for a long time through the migration and transfer film of low friction phase or solid lubricating phase inside the material, thereby reducing the maintenance frequency and improving the safety and reliability of the bearing throughout its entire life cycle. This is the fundamental reason for the requirement of self-lubricating performance for bearing materials.

[0003] Traditional self-lubricating materials often use polytetrafluoroethylene (PTFE) or modified ultra-high molecular weight polyethylene (UHMWPE). PTFE is prone to cold flow, creep, and edge step wear under high temperature and pressure. Although modified UHMWPE has better wear resistance, it still experiences creep, surface fatigue, and drying of auxiliary silicone grease under high contact pressure and repeated reciprocating displacement conditions. This leads to an increase in the coefficient of friction and localized step wear, with frictional performance fluctuating significantly over time. It is difficult to match the long-term frictional displacement requirements of bridge bearings and cannot truly achieve the goal of "long-term self-lubrication of the material itself."

[0004] Based on the above problems, it is necessary to develop a self-lubricating and wear-resistant composite rubber and plastic material that does not rely on external lubricants and can effectively suppress the decline of friction performance. Summary of the Invention

[0005] In view of this, the present invention provides a self-lubricating wear-resistant composite material for building seismic isolation bearings and a method for preparing the same.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0007] The first aspect of the present invention provides a self-lubricating wear-resistant composite material for building seismic isolation bearings, the self-lubricating wear-resistant composite material for building seismic isolation bearings comprising the following raw material components in parts by weight: 40-80 parts aliphatic polyketone, 20-30 parts polytetrafluoroethylene, 10-15 parts high-polystyrene resin modified methyl vinyl silicone rubber, 1-5 parts silicone resin, 1-5 parts solid lubricating particles, 1-5 parts silicone oil, 1-5 parts compatibilizer, 1-3 parts antioxidant, 1-3 parts stabilizer and 1-3 parts coupling agent;

[0008] The raw material components of the solid lubricating particles include tungsten disulfide and hexagonal boron nitride.

[0009] Compared to existing technologies, this invention uses aliphatic polyketone, polystyrene resin-modified methyl vinyl silicone rubber, polytetrafluoroethylene, and silicone resin as a composite matrix. Based on this matrix, novel functional components such as hexagonal boron nitride, tungsten disulfide, and self-lubricating microcapsules coated with silicone oil or vegetable oil are synergistically introduced. The raw materials have clear divisions of labor and complementary effects: Aliphatic polyketone possesses high yield strength, rigidity, and wear resistance, while also exhibiting excellent resistance to chemical media and fatigue resistance. It serves as the main load-bearing skeleton in the material, equivalent to a "rigid support," ensuring sufficient load-bearing capacity and dimensional stability of the support under heavy loads and long-term cyclic loading; polystyrene resin-modified methyl vinyl silicone rubber... The flexible rubber phase provides energy absorption and release through large shear deformation in the composite system, improving the displacement coordination and resilience of the bridge bearing. On the other hand, it forms a "rigid-flexible" synergistic structure with aliphatic polyketone, alleviating stress concentration and inhibiting the initiation and propagation of fatigue cracks. The silicone resin can maintain a high glass transition temperature and dimensional stability at high temperatures, and can form a dense three-dimensional cross-linked network between the polystyrene resin-modified methyl vinyl silicone rubber phase and the aliphatic polyketone phase. On the one hand, it improves the overall thermal stability and rheological resistance of the material, preventing cold flow and permanent deformation of the bearing under long-term high-temperature loading. On the other hand, it improves the interfacial bonding between the inorganic lubricating filler and the organic matrix through the interaction with the coupling agent.

[0010] Polytetrafluoroethylene (PTFE), with its extremely low coefficient of friction and excellent chemical inertness, serves as a self-lubricating base. During mixing and service, it gradually migrates to the friction interface and forms a continuous or discontinuous transfer film, significantly reducing the coefficient of friction and wear of the support sliding surface. At the same time, its soft crystalline structure can also form a certain physical entanglement with the polystyrene resin-modified methyl vinyl silicone rubber phase and the aliphatic polyketone phase, preventing the lubricating phase from precipitating out in a concentrated manner and causing interface peeling. The introduced layered hexagonal boron nitride is a solid lubricant with excellent self-lubricating and thermal conductivity. Its layered structure can build thermal conduction and slip pathways within the material, helping to rapidly diffuse the heat generated by friction along the in-plane, reducing interface temperature rise and delaying material thermal aging. Furthermore, in synergy with polytetrafluoroethylene (PTFE), it constructs a multi-scale solid lubrication transfer film of "layer-film" superposition on the friction pair surface, transforming the friction process from adhesive friction to boundary lubrication dominated by interlayer slip. Tungsten disulfide, also a layered solid lubricant, has low shear strength, extremely low coefficient of friction, and maintains stable lubrication performance over high contact pressure and a wide temperature range. In this invention, it is used in combination with hexagonal boron nitride and PTFE to fill microscopic roughness peaks and valleys, reducing the actual contact area and shear stress. Additionally, it forms a dense WS layer on the mating surfaces. 2 / The BN / PTFE composite lubricating film significantly reduces the coefficient of friction and wear rate; the addition of silicone oil ensures that the shell remains intact under material processing and normal loads, without affecting the overall strength of the material. Under the high contact pressure, repeated shearing, and impact during the actual service of bridge bearings, it outperforms the original WS... 2 / The BN / PTFE solid lubricating phases work together to replenish the liquid lubricating film at the friction interface in real time, thereby establishing a self-lubricating network of "solid lubricating phase + liquid lubricating phase" working synergistically without the need for or with minimal external grease replenishment.

[0011] Through the coupling design of the matrix resin with various lubricating and elastic phases, combined with necessary additives, this invention achieves an effective match between a high-strength load-bearing skeleton and a highly elastic and flexible phase, significantly reducing the risk of compression set and fatigue cracking. On the other hand, it realizes a self-generating and self-compensating multi-scale lubrication system, enabling bridge bearings to maintain a low and stable coefficient of friction and excellent wear resistance throughout their entire life cycle, significantly reducing dependence on external greases, and solving the technical problems of rapid decay of self-lubricating performance, frequent maintenance, and high cost of existing bearing materials.

[0012] Preferably, the preparation method of the polystyrene resin modified methyl vinyl silicone rubber includes the following steps:

[0013] S1. Keep methyl vinyl silicone rubber at 80-100℃ for 50-70 min to obtain pretreated methyl vinyl silicone rubber.

[0014] S2. The pretreated methyl vinyl silicone rubber is impregnated in the modified mixture, and a vacuum-backfill cycle is performed to separate the solid and liquid. Under an inert atmosphere, the temperature is raised to 120-130°C in stages to carry out the polymerization reaction. After cooling, washing, and drying, the precursor is obtained. The modified mixture includes styrene, organic solvent, initiator, and stabilizer.

[0015] S3. The precursor is kept at 90-110°C for 1-2 hours to obtain the polystyrene resin modified methyl vinyl silicone rubber.

[0016] More preferably, in S2, the mass-to-volume ratio of the pretreated methyl vinyl silicone rubber to the modified mixture is 1g:2mL-1g:3mL.

[0017] More preferably, in S2, the modified mixture comprises the following raw material components in the following mass percentages: 20%-30% styrene, 45%-60% organic solvent, 5%-15% initiator and 5%-10% stabilizer.

[0018] In a further preferred embodiment, S2 includes the following steps for the segmented heating: first, heating to 75-85℃ and holding for 4-5 hours; then heating to 95-105℃ and holding for 2-3 hours; and finally heating to 120-130℃.

[0019] More preferably, in S2, the holding time for the polymerization reaction is 30-40 minutes.

[0020] More preferably, the organic solvent is toluene and ethyl acetate in a volume ratio of 1:1 to 1:2.

[0021] More preferably, the initiator is azobisisobutyronitrile.

[0022] More preferably, the stabilizer is divinylbenzene.

[0023] Preferably, the solid lubricating particles comprise tungsten disulfide and hexagonal boron nitride in a mass ratio of 2:1 to 3:1.

[0024] Preferably, the tungsten disulfide has a particle size of 0.2-5 μm and a specific surface area of ​​3-20 m². 2 / g;

[0025] Preferably, the hexagonal boron nitride powder has a particle size of 0.5-10 μm and a specific surface area of ​​5-15 m². 2 / g.

[0026] Preferably, the aliphatic polyketone has a melt flow rate of 3-20 g / 10 min measured at 240°C and 2.16 kg; the aliphatic polyketone has a weight-average molecular weight of 180,000-320,000 and a polydispersity index (PDI) of 2.3-3.2.

[0027] Preferably, the weight-average molecular weight of the silicone resin is 10,000-80,000.

[0028] Preferably, the polytetrafluoroethylene is polytetrafluoroethylene micro powder with a particle size of 0.5-20 μm.

[0029] Preferably, the antioxidant is BASF 1010.

[0030] Preferably, the stabilizer is UV-531.

[0031] Preferably, the compatibilizer is maleic anhydride-grafted polypropylene or maleic anhydride-grafted polyethylene.

[0032] Preferably, the silicone oil is methylphenyl silicone oil or methyl silicone oil.

[0033] Preferably, the coupling agent is a silane coupling agent.

[0034] More preferably, the silane coupling agent is of type KH550 or KH570.

[0035] The second aspect of the present invention provides a method for preparing the self-lubricating wear-resistant composite material for building seismic isolation bearings, comprising the following steps: the self-lubricating wear-resistant composite material for building seismic isolation bearings is prepared by any one of compression molding, injection molding or extrusion calendering.

[0036] Preferably, the compression molding method includes the following steps:

[0037] Step 1: Weigh each component raw material according to the design ratio, mix them evenly to obtain the mixture;

[0038] Step 2: Heat the mixture to 240-270℃ and mold it, then cool it down and remove it from the mold to obtain a self-lubricating and wear-resistant composite material for building seismic isolation bearings.

[0039] Preferably, the injection molding method includes the following steps:

[0040] Step 1: Weigh aliphatic polyketone, high-styrene resin modified methyl vinyl silicone rubber, silicone resin and polytetrafluoroethylene according to the design ratio, mix them evenly, keep them at 100-110℃ for 3-6 hours, mix them evenly under the conditions of barrel temperature of 200-250℃, main machine speed of 140-180rpm and feeder speed of 5-10rpm, cool, granulate, and obtain the first mixture.

[0041] Step 2: Add the first mixture to the injection molding machine, add the remaining raw material components, and inject it into the mold cavity under the conditions of injection pressure of 60-150 bar, barrel temperature of 200-250℃ and holding pressure of 50-80 bar. Hold the pressure for 100-140 seconds and extrude to obtain the self-lubricating wear-resistant composite material for building seismic isolation bearings.

[0042] In a further preferred embodiment, step two also includes an injection speed of 40-50 mm / s.

[0043] In summary, this invention designs a self-lubricating and wear-resistant composite material for building seismic isolation bearings. It uses aliphatic polyketide, high-styrene resin-modified methyl vinyl silicone rubber, polytetrafluoroethylene (PTFE), and silicone resin to form a high-strength, high-elasticity skeleton, ensuring good deformation and recovery capabilities under heavy loads and repeated displacements. Tungsten disulfide and hexagonal boron nitride, together with PTFE, form a stable solid lubricating film at the friction interface, which, combined with the liquid lubricating film formed by silicone oil, achieves solid / liquid lubrication synergy, maintaining low friction and low wear over a long period. Through the multi-phase synergy of "high-strength matrix + solid lubrication + silicone oil liquid lubrication," the problem of existing bearings' high dependence on external grease and short self-lubricating life is fundamentally improved. Detailed Implementation

[0044] The technical solutions in the embodiments of the present invention will be clearly and completely described below. 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.

[0045] The preparation methods of the polystyrene resin modified methyl vinyl silicone rubber described in the following embodiments and comparative examples include the following steps:

[0046] S1. 500g of methyl vinyl silicone rubber is kept at 80-100℃ for 50-70min to obtain pretreated methyl vinyl silicone rubber.

[0047] S2. The pretreated methyl vinyl silicone rubber is impregnated in 1200 mL of modified mixture, and vacuum-backfill cycles are performed 3 times to separate the solid and liquid. Under an inert atmosphere, the temperature is first raised to 80°C and held for 5 h; then raised to 100°C and held for 2 h; finally, the temperature is raised to 120-130°C for polymerization reaction for 35 min. After cooling, washing, and drying, the precursor is obtained. The modified mixture includes the following raw material components in the following mass percentages: 25% styrene, 55% toluene and ethyl acetate in a volume ratio of 1:1, 12% azobisisobutyronitrile, and 8% divinylbenzene.

[0048] S3. The precursor is kept at 100°C for 1 hour to obtain the polystyrene resin modified methyl vinyl silicone rubber.

[0049] The tungsten disulfide particles described in the following examples and comparative examples have a particle size of 2 μm and a specific surface area of ​​10 m². 2 / g.

[0050] The hexagonal boron nitride powders described in the following examples and comparative examples have a particle size of 5 μm and a specific surface area of ​​10 m². 2 / g.

[0051] The aliphatic polyketides described in the following examples and comparative examples have a melt flow rate of 15 g / 10 min, a weight-average molecular weight of 180,000, and a polydispersity index (PDI) of 2.5, measured at 240°C and 2.16 kg.

[0052] The weight-average molecular weight of the silicone resins described in the following examples and comparative examples is 60,000.

[0053] The particle size of the polytetrafluoroethylene micropowder described in the following examples and comparative examples is 10 μm.

[0054] Unless otherwise stated, all raw materials used in the following examples and comparative examples are commercially available products.

[0055] Example 1

[0056] This embodiment provides a self-lubricating wear-resistant composite material for building seismic isolation bearings and its preparation method, specifically including the following:

[0057] The self-lubricating and wear-resistant composite material for building seismic isolation bearings comprises the following raw material components in parts by weight: 70 parts aliphatic polyketone, 30 parts polytetrafluoroethylene, 10 parts high-styrene resin modified methyl vinyl silicone rubber, 5 parts silicone resin, 5 parts solid lubricating particles, 4 parts methyl phenyl silicone oil, 3 parts maleic anhydride grafted polypropylene, 2 parts BASF 1010 antioxidant, 2 parts UV-531 stabilizer, and 2 parts coupling agent.

[0058] The solid lubricating particles comprise tungsten disulfide and hexagonal boron nitride in a mass ratio of 2:1.

[0059] The preparation method of the self-lubricating wear-resistant composite material for building seismic isolation bearings includes the following steps:

[0060] Step 1: Weigh each component raw material according to the design ratio, mix them evenly to obtain the mixture;

[0061] Step 2: Heat the mixture to 250°C and mold it, then cool it down and remove it from the mold to obtain a self-lubricating and wear-resistant composite material for building seismic isolation bearings.

[0062] Example 2

[0063] This embodiment provides a self-lubricating wear-resistant composite material for building seismic isolation bearings and its preparation method, specifically including the following:

[0064] The self-lubricating and wear-resistant composite material for building seismic isolation bearings comprises the following raw material components in parts by weight: 50 parts aliphatic polyketone, 20 parts polytetrafluoroethylene, 15 parts high-polystyrene resin modified methyl vinyl silicone rubber, 5 parts silicone resin, 5 parts solid lubricating particles, 5 parts methyl phenyl silicone oil, 3 parts maleic anhydride grafted polyethylene, 2 parts BASF 1010 antioxidant, 2 parts UV-531 stabilizer, and 2 parts coupling agent.

[0065] The solid lubricating particles comprise tungsten disulfide and hexagonal boron nitride in a mass ratio of 3:1.

[0066] The preparation method of the self-lubricating wear-resistant composite material for building seismic isolation bearings includes the following steps:

[0067] Step 1: Weigh each component raw material according to the design ratio, mix them evenly to obtain the mixture;

[0068] Step 2: Heat the mixture to 265°C and mold it, then cool it down and remove it from the mold to obtain a self-lubricating and wear-resistant composite material for building seismic isolation bearings.

[0069] Example 3

[0070] This embodiment provides a self-lubricating wear-resistant composite material for building seismic isolation bearings and its preparation method, specifically including the following:

[0071] The self-lubricating and wear-resistant composite material for building seismic isolation bearings comprises the following raw material components in parts by weight: 60 parts aliphatic polyketone, 25 parts polytetrafluoroethylene, 10 parts high-styrene resin modified methyl vinyl silicone rubber, 5 parts silicone resin, 5 parts solid lubricating particles, 5 parts methyl silicone oil, 3 parts maleic anhydride grafted polypropylene, 2 parts BASF 1010 antioxidant, 2 parts UV-531 stabilizer, and 2 parts coupling agent.

[0072] The solid lubricating particles comprise tungsten disulfide and hexagonal boron nitride in a mass ratio of 2.5:1.

[0073] The preparation method of the self-lubricating wear-resistant composite material for building seismic isolation bearings includes the following steps:

[0074] Step 1: Weigh aliphatic polyketone, high-styrene resin modified methyl vinyl silicone rubber, silicone resin and polytetrafluoroethylene according to the design ratio, mix them evenly, and keep them at 105℃ for 4 hours. Set the barrel temperature as follows: Section 1 210℃, Section 2 220℃, Section 3 230℃, Section 4 235℃, Section 5 225℃, Section 6 225℃, Section 7 225℃, Section 8 225℃, Section 9 225℃, and the die head temperature 230℃. After the barrel temperature is constant, start the main machine and set the speed to 160 rpm. Set the feeder speed to 8 rpm. The rubber strip is extruded, cooled in a water bath, and then cut and granulated by a pelletizer to obtain the first mixture.

[0075] Step 2: Add the first mixture to the injection molding machine, add the remaining raw material components, and set the barrel temperature as follows: Section 1 205℃, Section 2 215℃, Section 3 225℃, Section 4 235℃, and nozzle 230℃; close the mold and inject, with an injection pressure of 100 bar and an injection speed of 45 mm / s; hold pressure and cool, with a holding pressure of 60 bar and a holding time of 120 s; after cooling, open the mold and eject to obtain the self-lubricating wear-resistant composite material for building vibration damping and isolation bearings.

[0076] Comparative Example 1

[0077] This comparative example provides a self-lubricating and wear-resistant composite material for building seismic isolation bearings. The difference from Example 1 is that the high-styrene resin modified methyl vinyl silicone rubber is replaced with an equal amount of methyl vinyl silicone rubber, while other components and processes remain unchanged, which will not be described in detail here.

[0078] Comparative Example 2

[0079] This comparative example provides a self-lubricating wear-resistant composite material for building seismic isolation bearings. The difference from Example 1 is that the solid lubricating particles are replaced with an equal amount of tungsten disulfide particles, while other components and processes remain unchanged, which will not be described in detail here.

[0080] Comparative Example 3

[0081] This comparative example provides a self-lubricating wear-resistant composite material for building seismic isolation bearings. The difference from Example 1 is that the solid lubricating particles are replaced with an equal amount of graphite, while other components and processes remain unchanged, which will not be described in detail here.

[0082] To further verify the technical effects of the present invention, the self-lubricating wear-resistant composite materials for building seismic isolation bearings obtained in Examples 1-3 and Comparative Examples 1-3 were subjected to the following tests: The hardness of the samples was measured using a Shore hardness tester (referencing GB / T 2411-2008); the tensile strength and tensile modulus of elasticity were tested according to GB / T 1040.1-2018; the linear wear rate was tested according to JT / T 901-2023; the relative sliding speed for the dynamic friction coefficient test was 15 / 100 / 200 / 300 mm / s; and the test temperature was 23±2℃. The test results are shown in Table 1.

[0083] Table 1. Performance test results of self-lubricating wear-resistant composite materials for building seismic isolation bearings obtained from various embodiments and comparative examples.

[0084]

[0085] As can be seen from Table 1, there are significant differences between the examples and the comparative examples in terms of tribological and mechanical properties. In terms of the coefficient of friction at different sliding speeds (15, 100, 200, 300 mm / s) under a load of 45 MPa, the coefficients of friction for Example 1 are 0.039, 0.035, 0.034, and 0.030, respectively. The overall coefficient of friction is less than 0.04, and the values ​​are all lower than those for Comparative Example 1 (0.047, 0.041, 0.039, 0.035) and Comparative Example 3 (0.044, 0.045, 0.042, 0.037). Especially under low speed conditions of 15 mm / s and high speed conditions of 300 mm / s, the friction coefficient of Example 1 is significantly lower than that of Comparative Example 1, indicating that it has better friction reduction performance under both boundary lubrication and high sliding speed conditions; under high speed conditions of 100, 200, and 300 mm / s, the friction coefficient of Example 1 is significantly lower than that of Comparative Example 2 (0.043, 0.043, and 0.039), indicating that it has better friction reduction performance under high sliding speed conditions.

[0086] Regarding wear resistance, the linear wear rate of Example 1 was 5.08 μm / km, significantly lower than that of Comparative Example 1 (12.58 μm / km), representing only about 40% of the latter. This indicates that Example 1 exhibits significantly superior wear resistance under high-load, unlubricated conditions. Compared to Comparative Example 2 (6.33 μm / km) and Comparative Example 3 (6.45 μm / km), Example 1 also showed a lower linear wear rate, demonstrating superior wear stability.

[0087] In terms of mechanical properties, the tensile strength of Example 1 is 52.8 MPa, which is higher than that of Comparative Examples 1-3; the tensile elastic modulus of Example 1 is 1433 MPa, which is also significantly higher than that of Comparative Examples 1-3. This indicates that the material of Example 1 has higher rigidity and load-bearing capacity while maintaining good toughness.

[0088] In summary, the self-lubricating wear-resistant composite material for building seismic isolation bearings provided by this invention exhibits significant advantages in terms of friction reduction performance, wear resistance, mechanical strength, and modulus. This indicates that the composition or structural design of this invention is more conducive to forming a stable lubricating wear-resistant composite system, achieving a synergistic improvement in low friction, high wear resistance, and high strength.

[0089] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A self-lubricating wear-resistant composite material for building seismic isolation bearings, characterized in that, The self-lubricating wear-resistant composite material for building seismic isolation bearings comprises the following raw material components in parts by weight: 40-80 parts aliphatic polyketone, 20-30 parts polytetrafluoroethylene, 10-15 parts high-styrene resin modified methyl vinyl silicone rubber, 1-5 parts silicone resin, 1-5 parts solid lubricating particles, 1-5 parts silicone oil, 1-5 parts compatibilizer, 1-3 parts antioxidant, 1-3 parts stabilizer, and 1-3 parts coupling agent; The raw material components of the solid lubricating particles include tungsten disulfide and hexagonal boron nitride; The preparation method of the polystyrene resin modified methyl vinyl silicone rubber includes the following steps: S1. Keep methyl vinyl silicone rubber at 80-100℃ for 50-70 min to obtain pretreated methyl vinyl silicone rubber. S2. The pretreated methyl vinyl silicone rubber is impregnated in the modified mixture, and a vacuum-backfill cycle is performed to separate the solid and liquid. Under an inert atmosphere, the temperature is raised to 120-130°C in stages to carry out the polymerization reaction. After cooling, washing, and drying, the precursor is obtained. The modified mixture includes styrene, organic solvent, initiator, and stabilizer. S3. The precursor is kept at 90-110℃ for 1-2 hours to obtain the polystyrene resin modified methyl vinyl silicone rubber.

2. The self-lubricating wear-resistant composite material for building seismic isolation bearings as described in claim 1, characterized in that, In S2, the mass-to-volume ratio of the pretreated methyl vinyl silicone rubber to the modified mixture is 1g:2mL-1g:3mL; In S2, the modified mixture comprises the following raw material components in the following mass percentages: 20%-30% styrene, 45%-60% organic solvent, 5%-15% initiator and 5%-10% stabilizer. In S2, the specific steps of the segmented heating are as follows: first, heat to 75-85℃ and hold for 4-5 hours; then heat to 95-105℃ and hold for 2-3 hours; finally, heat to 120-130℃. In S2, the holding time for the polymerization reaction is 30-40 minutes.

3. The self-lubricating wear-resistant composite material for building seismic isolation bearings as described in claim 1 or 2, characterized in that, The organic solvent is toluene and ethyl acetate in a volume ratio of 1:1 to 1:2; The initiator is azobisisobutyronitrile; The stabilizer is divinylbenzene.

4. The self-lubricating wear-resistant composite material for building seismic isolation bearings as described in claim 1, characterized in that: The solid lubricating particles comprise tungsten disulfide and hexagonal boron nitride in a mass ratio of 2:1 to 3:

1.

5. The self-lubricating wear-resistant composite material for building seismic isolation bearings as described in claim 4, characterized in that: The tungsten disulfide has a particle size of 0.2-5 μm and a specific surface area of ​​3-20 m². 2 / g; The hexagonal boron nitride powder has a particle size of 0.5-10 μm and a specific surface area of ​​5-15 m². 2 / g.

6. The self-lubricating wear-resistant composite material for building seismic isolation bearings as described in claim 5, characterized in that: The aliphatic polyketone had a melt flow rate of 3-20 g / 10 min measured at 240℃ and 2.16 kg; the weight-average molecular weight of the aliphatic polyketone was 180,000-320,000, and the polydispersity index (PDI) was 2.3-3.

2. The weight-average molecular weight of the silicone resin is 10,000-80,000; The polytetrafluoroethylene is polytetrafluoroethylene micro powder with a particle size of 0.5-20μm.

7. The self-lubricating wear-resistant composite material for building seismic isolation bearings as described in claim 1, characterized in that: The antioxidant is BASF 1010; The stabilizer is designated as UV-531. The compatibilizer is maleic anhydride-grafted polypropylene or maleic anhydride-grafted polyethylene. The silicone oil is methylphenyl silicone oil or methyl silicone oil; The coupling agent is a silane coupling agent.

8. A method for preparing a self-lubricating wear-resistant composite material for building seismic isolation bearings as described in any one of claims 1-7, characterized in that: The self-lubricating wear-resistant composite material used for building seismic isolation bearings is prepared by any one of the following methods: compression molding, injection molding, or extrusion calendering.

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