High-strength wear-resistant composite material for building seismic isolation support and preparation method thereof

Abstract

This invention relates to the field of sliding materials for seismic isolation bearings, specifically disclosing a high-strength wear-resistant composite material for building seismic isolation bearings and its preparation method. The high-strength wear-resistant composite material for building seismic isolation bearings comprises the following raw material components in parts by weight: aliphatic polyketone, polystyrene resin-modified methyl vinyl silicone rubber, silicone resin, brominated butyl rubber, polytetrafluoroethylene, functional fillers, lubricants, compatibilizers, and coupling agents; the functional fillers comprise the following raw material components: maleimide-modified diatomaceous earth, graphene, and carbon black. The high-strength wear-resistant composite material for building seismic isolation bearings prepared by this invention exhibits high compressive strength and excellent wear resistance, achieving low wear, high strength, and stable and reliable service performance even under high loads, long periods, and repeated friction, effectively overcoming the shortcomings of existing technologies.

Description

Technical Field

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

[0002] Existing bridge seismic bearings have revealed several shortcomings under long-term service and strong earthquakes: Firstly, ordinary rubber materials struggle to balance load-bearing and deformation capabilities, easily exhibiting bulging, shear instability, and tensile cracking under conditions of "high load + high displacement + multiple cycles," resulting in significant residual deformation after earthquakes. Secondly, the rubber or plastic materials commonly used in the sliding or contact surfaces of the bearings have limited wear resistance, easily generating wear, cold flow, and surface steps under high contact pressure and repeated sliding, leading to degraded friction performance, asynchronous sliding, deflection, or even jamming failure. Furthermore, traditional rubber / plastic systems are sensitive to environmental media such as temperature, ozone, ultraviolet radiation, oil, and salt spray, easily experiencing aging, hardening, cracking, and bonding interface damage. Their damping performance significantly degrades after multiple cycles, making it difficult to ensure the bearings stably perform their seismic isolation and energy dissipation functions throughout their entire lifespan, resulting in maintenance difficulties and high replacement costs.

[0003] Based on the above problems, it is necessary to develop a high-strength and wear-resistant composite rubber-plastic material that can improve compressive strength, tear resistance and wear resistance while maintaining sufficient shear deformation capacity and energy dissipation performance, thus slowing down environmental aging and performance degradation, and improving the safety and durability of bridge seismic bearings under strong earthquake and long-term service conditions from the material level. Summary of the Invention

[0004] In view of this, the present invention provides a high-strength wear-resistant composite material for building seismic isolation bearings and a method for preparing the same.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0006] The first aspect of this invention provides a high-strength wear-resistant composite material for building seismic isolation bearings, the high-strength wear-resistant composite material for building seismic isolation bearings comprising the following raw material components in parts by weight: 40-80 parts aliphatic polyketone, 10-20 parts high-styrene resin modified methyl vinyl silicone rubber, 10-20 parts silicone resin, 10-20 parts brominated butyl rubber, 10-20 parts polytetrafluoroethylene, 1-10 parts functional filler, 1-5 parts lubricant, 1-5 parts compatibilizer, and 1-3 parts coupling agent;

[0007] The functional filler comprises the following raw material components: maleimide-modified diatomaceous earth, graphene, and carbon black.

[0008] Compared to existing technologies, the high-strength wear-resistant composite system provided by this invention features complementary and synergistic effects among its raw materials. Aliphatic polyketone possesses high yield strength and elastic modulus, low creep deformation, and excellent wear resistance, providing a stable load-bearing skeleton and anti-wear function under high contact pressure and repeated sliding conditions. Simultaneously, its low water absorption, excellent resistance to hydrolysis, and resistance to media such as de-icing salt, fuel oil, and lubricating oil ensure that the support plastic maintains good dimensional stability and mechanical retention even in humid, hot, salt spray, and oily environments. The high-polystyrene resin-modified methyl vinyl silicone rubber, through grafting / interpenetrating networks, balances surface hardness and interfacial energy. The system enhances the performance of silicone rubber while retaining its elasticity and temperature resistance, providing energy dissipation and crack retardation under impact and vibration. Brominated butyl rubber has excellent airtightness and damping properties, forming a vibration-absorbing buffer layer to reduce wear heat and noise and improve fatigue life. Silicone resin can construct a heat-resistant and aging-resistant three-dimensional network structure during processing and service, further improving the material's thermal stability, weather resistance and interfacial bonding strength, ensuring that the support is not prone to cracking or pulverization under long-term temperature difference cycling and ultraviolet irradiation. Polytetrafluoroethylene has an extremely low coefficient of friction and anti-adhesion properties, and easily forms a stable "transfer film" on the mating surfaces during friction, significantly reducing the wear coefficient and adhesive wear.

[0009] Maleimide-modified diatomaceous earth possesses a porous shell and high specific surface area. The maleimide groups on its surface can undergo Michael addition or condensation with active groups such as amines / thiol groups in the matrix, constructing a robust interface and forming a micro-rigid framework, thereby improving modulus, thermal stability, and wear resistance. Graphene exhibits easy interlayer shearing, high in-plane strength, and high thermal conductivity, enabling it to bear loads at the interface and rapidly dissipate frictional heat, while also acting as a solid lubricating layer to reduce shear resistance. Carbon black provides a classic reinforcing effect and a crack passivation / deflection mechanism, improving wear resistance index and tear resistance.

[0010] Furthermore, this invention incorporates relevant additives. The lubricant reduces internal and external friction of the melt and suppresses shear heating during the processing stage, and works synergistically with polytetrafluoroethylene and graphene to maintain a low-friction surface during the service stage. The compatibilizer and coupling agent significantly improve dispersion, interfacial adhesion and load transfer efficiency by reducing the polarity / surface energy difference and introducing chemical bonds or physical interlocks between the organic phase and the inorganic filler.

[0011] This invention utilizes the synergistic effect of the above components to enable the resulting bearing plastic to simultaneously possess high load-bearing capacity, high wear resistance, low friction, good elasticity, and excellent environmental durability under the bridge service conditions of "high load + large displacement + multiple cycles". It effectively suppresses bearing bulging, cold flow, jamming, and residual displacement after earthquakes, significantly extending the service life of the bearing and improving the overall seismic safety of the bridge structure.

[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 functional filler comprises maleimide-modified diatomaceous earth, graphene, and carbon black in a mass ratio of 1:2:5 to 1:3:5.

[0024] Preferably, the preparation method of the maleimide-modified diatomaceous earth includes the following steps: acid washing and filtration of the diatomaceous earth to obtain pretreated diatomaceous earth;

[0025] Maleimide propyltrimethoxysilane was mixed with a hydrolysate and hydrolyzed for 20-30 minutes to obtain a modified solution.

[0026] The modified liquid is mixed evenly with the pretreated diatomaceous earth, heated to 70-80℃ for modification treatment, solid-liquid separation, and drying to obtain maleimide-modified diatomaceous earth.

[0027] More preferably, acid washing is performed using a 0.1-0.2 mol / L hydrochloric acid solution; the mass-to-volume ratio of the diatomaceous earth to the hydrochloric acid solution is 1 g:8 mL to 1 g:10 mL.

[0028] More preferably, the hydrolysate is anhydrous ethanol with a pH of 4.5-4.8.

[0029] More preferably, the mass ratio of maleimide propyltrimethoxysilane to hydrolysate is 1g:200mL-1g:250mL.

[0030] More preferably, the volume-to-mass ratio of the modified liquid to the pretreated diatomaceous earth is 20 mL:1 g to 25 mL:1 g.

[0031] More preferably, the modification treatment takes 2-3 hours.

[0032] More preferably, the graphene has a particle size of 50-100 nm.

[0033] More preferably, the carbon black has a particle size of 150-200 nm.

[0034] Preferably, the weight-average molecular weight of the silicone resin is 10,000-80,000.

[0035] 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.

[0036] Preferably, the polytetrafluoroethylene is polytetrafluoroethylene micro powder with a particle size of 0.5-20 μm.

[0037] Preferably, the lubricant is methyl silicone oil, methyl phenyl silicone oil, polyethylene wax, or Fischer-Tropsch wax.

[0038] Preferably, the compatibilizer is maleic anhydride-grafted polypropylene.

[0039] Preferably, the coupling agent is a titanate coupling agent.

[0040] Preferably, the brominated butyl rubber is of type BIIR2222 or BIIIR2255.

[0041] The second aspect of the present invention provides a method for preparing the high-strength wear-resistant composite material for building seismic isolation bearings, comprising the following steps: the high-strength wear-resistant composite material for building seismic isolation bearings is prepared by any one of compression molding, injection molding or extrusion calendering.

[0042] Preferably, the compression molding method includes the following steps:

[0043] Step 1: Weigh each component raw material according to the design ratio, mix them evenly to obtain the mixture;

[0044] Step 2: Heat the mixture to 220-260℃ and mold it, then cool it down and remove it from the mold to obtain a high-strength wear-resistant composite material for building seismic isolation bearings.

[0045] Preferably, the injection molding method includes the following steps:

[0046] Step 1: Weigh aliphatic polyketone, high-styrene resin modified methyl vinyl silicone rubber, silicone resin, brominated butyl rubber and polytetrafluoroethylene according to the design ratio, mix them evenly, keep them at 110-140℃ 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.

[0047] 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 a high-strength wear-resistant composite material for building seismic isolation bearings.

[0048] In a further preferred embodiment, step two also includes an injection speed of 40-50 mm / s.

[0049] In summary, this invention designs a high-strength, wear-resistant composite material for building seismic isolation bearings. It uses aliphatic polyketide, polystyrene resin-modified methyl vinyl silicone rubber, silicone resin, brominated butyl rubber, and polytetrafluoroethylene as matrix materials, and adds maleimide-modified diatomaceous earth, graphene, and carbon black as functional fillers, supplemented with lubricants, compatibilizers, and coupling agents. Compared with existing technologies, this high-strength, wear-resistant composite material for building seismic isolation bearings possesses high compressive strength and excellent wear resistance, achieving low wear, high strength, and stable and reliable service performance even under high loads, long periods, and repeated friction. Detailed Implementation

[0050] 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.

[0051] The preparation methods of the polystyrene resin modified methyl vinyl silicone rubber described in the following embodiments and comparative examples include the following steps:

[0052] S1. 500g of methyl vinyl silicone rubber is kept at 80-100℃ for 50-70min to obtain pretreated methyl vinyl silicone rubber.

[0053] 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.

[0054] S3. The precursor is kept at 100°C for 1 hour to obtain the polystyrene resin modified methyl vinyl silicone rubber.

[0055] The preparation methods of maleimide-modified diatomaceous earth described in the following examples and comparative examples include the following steps: 100g of diatomaceous earth with a particle size of 100-150μm is acid-washed with 1000mL of 0.1mol / L hydrochloric acid solution; filtered to obtain pretreated diatomaceous earth;

[0056] 10g of maleimide propyltrimethoxysilane was mixed with 2200mL of anhydrous ethanol at pH 4.6 and hydrolyzed for 25min to obtain the modified solution.

[0057] The modified liquid was mixed evenly with the pretreated diatomaceous earth, and the mixture was heated to 75°C for 2.5 hours for modification treatment. After solid-liquid separation and drying, maleimide-modified diatomaceous earth was obtained.

[0058] The aliphatic polyketones described in the following examples and comparative examples had a melt flow rate of 15 g / 10 min measured at 240 °C and 2.16 kg; the weight-average molecular weight of the aliphatic polyketones was 180,000, and the polydispersity index (PDI) was 2.5.

[0059] The graphene particles described in the following examples and comparative examples have a particle size of 100 nm.

[0060] The carbon black in the following examples and comparative examples has a particle size of 150 nm.

[0061] The weight-average molecular weight of the silicone resins described in the following examples and comparative examples is 60,000.

[0062] The particle size of the polytetrafluoroethylene micropowder described in the following examples and comparative examples is 10 μm.

[0063] The brominated butyl rubber described in the following examples and comparative examples is of type BIIR2222 or BIIIR2255.

[0064] Unless otherwise stated, all raw materials used in the following examples and comparative examples are commercially available products.

[0065] Example 1

[0066] This embodiment provides a high-strength wear-resistant composite material for building seismic isolation bearings and its preparation method, specifically including the following:

[0067] The high-strength wear-resistant composite material for building seismic isolation bearings comprises the following raw material components in parts by weight: 60 parts aliphatic polyketone, 15 parts high-styrene resin modified methyl vinyl silicone rubber, 20 parts silicone resin, 10 parts brominated butyl rubber, 10 parts polytetrafluoroethylene micro powder, 8 parts functional filler, 3 parts methyl silicone oil, 3 parts maleic anhydride grafted polypropylene, and 2 parts titanate coupling agent.

[0068] The functional filler consists of maleimide-modified diatomaceous earth, graphene, and carbon black in a mass ratio of 1:2:5.

[0069] The preparation method of the high-strength wear-resistant composite material for building seismic isolation bearings includes the following steps:

[0070] Step 1: Weigh each component raw material according to the design ratio, mix them evenly to obtain the mixture;

[0071] Step 2: Heat the mixture to 260°C and mold it, then cool it down and remove it from the mold to obtain a high-strength wear-resistant composite material for building seismic isolation bearings.

[0072] Example 2

[0073] This embodiment provides a high-strength wear-resistant composite material for building seismic isolation bearings and its preparation method, specifically including the following:

[0074] The high-strength 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 polystyrene resin modified methyl vinyl silicone rubber, 15 parts silicone resin, 15 parts brominated butyl rubber, 15 parts polytetrafluoroethylene micro powder, 5 parts functional filler, 3 parts methyl phenyl silicone oil, 3 parts maleic anhydride grafted polypropylene, and 2 parts titanate coupling agent.

[0075] The functional filler consists of maleimide-modified diatomaceous earth, graphene, and carbon black in a mass ratio of 1:3:5.

[0076] The preparation method of the high-strength wear-resistant composite material for building seismic isolation bearings includes the following steps:

[0077] Step 1: Weigh each component raw material according to the design ratio, mix them evenly to obtain the mixture;

[0078] Step 2: Heat the mixture to 250°C and mold it, then cool it down and remove it from the mold to obtain a high-strength wear-resistant composite material for building seismic isolation bearings.

[0079] Example 3

[0080] This embodiment provides a high-strength wear-resistant composite material for building seismic isolation bearings and its preparation method, specifically including the following:

[0081] The high-strength wear-resistant composite material for building seismic isolation bearings comprises the following raw material components in parts by weight: 60 parts aliphatic polyketone, 15 parts high-styrene resin modified methyl vinyl silicone rubber, 20 parts silicone resin, 10 parts brominated butyl rubber, 10 parts polytetrafluoroethylene micro powder, 10 parts functional filler, 5 parts methyl silicone oil, 5 parts maleic anhydride grafted polypropylene, and 2 parts titanate coupling agent.

[0082] The functional filler consists of maleimide-modified diatomaceous earth, graphene, and carbon black in a mass ratio of 1:2.5:5.

[0083] The preparation method of the high-strength wear-resistant composite material for building seismic isolation bearings includes the following steps:

[0084] Step 1: Weigh aliphatic polyketone, high-styrene resin modified methyl vinyl silicone rubber, silicone resin, brominated butyl rubber, and polytetrafluoroethylene according to the designed proportions, mix them evenly, and keep them at 130℃ for 4 hours. Set the barrel temperature as follows: Section 1 215℃, Section 2 225℃, Section 3 235℃, Section 4 240℃, Section 5 245℃, Section 6 240℃, Section 7 230℃, Section 8 230℃, Section 9 230℃, and the die head temperature 230℃. After the barrel temperature is constant, start the main machine and set the speed to 180 rpm. Set the feeder speed to 10 rpm. The rubber strip is extruded, cooled in a water bath, and then cut and granulated by a pelletizer to obtain the first mixture.

[0085] 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 1 215℃, Section 2 225℃, Section 3 235℃, Section 4 240℃, and nozzle 240℃; close the mold and inject, with an injection pressure of 100 bar and a 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 high-strength wear-resistant composite material for building vibration damping and isolation bearings.

[0086] Comparative Example 1

[0087] This comparative example provides a high-strength wear-resistant composite material for building seismic isolation bearings. The difference from Example 1 is that the polystyrene resin-modified methyl vinyl silicone rubber is replaced with an equal amount of methyl vinyl silicone rubber. Other components and processes remain unchanged and will not be described in detail here.

[0088] Comparative Example 2

[0089] This comparative example provides a high-strength wear-resistant composite material for building seismic isolation bearings. The difference from Example 1 is that maleimide-modified diatomaceous earth is replaced with an equal amount of diatomaceous earth, while other components and processes remain unchanged, which will not be described in detail here.

[0090] Comparative Example 3

[0091] This comparative example provides a high-strength wear-resistant composite material for building seismic isolation bearings. The difference from Example 1 is that aliphatic polyketone is replaced with an equal amount of ultra-high molecular weight polyethylene with a molecular weight of over 9 million. Other components and processes remain unchanged and will not be described in detail here.

[0092] To further verify the technical effects of the present invention, the high-strength wear-resistant composite materials for building seismic isolation bearings obtained in Examples 1-3 and Comparative Examples 1-3 were tested as follows: the hardness of the samples was measured using a Shore hardness tester (referencing GB / T2411-2008), 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, the test temperature was 23±2℃, and the test results are shown in Table 1. In the table, / represents a failed test, indicating that the test did not reach 50 km.

[0093] Table 1. Performance test results of high-strength wear-resistant composite materials for building seismic isolation bearings obtained from each embodiment and comparative example.

[0094]

[0095] As can be seen from the table, there are significant differences between the examples and the comparative examples in terms of friction performance, wear resistance, and mechanical properties. In terms of the friction coefficients at different sliding speeds (15, 100, 200, 300 mm / s) under a load of 60 MPa, the values ​​for Example 1 are 0.063, 0.061, 0.060, and 0.059, respectively. The overall friction coefficient is stable within the range of 0.06 ± 10%, and the friction coefficient is stable with small fluctuations. In comparison, Comparative Example 1 had friction coefficients of 0.076, 0.072, 0.071, and 0.060 under the same conditions, which were significantly higher than those of Example 1, especially at low speeds of 15 mm / s (0.076 vs 0.063), indicating that it had weaker friction control under high load and low speed conditions. Comparative Example 2 was close to that of Example 1 at some speeds, but was still slightly higher overall, and its stability was relatively poor. Comparative Example 3 had the highest friction coefficients at low and medium speeds (0.086, 0.075, and 0.064), showing poor friction reduction performance.

[0096] Regarding wear resistance, the linear wear rate of Example 1 was 14.02 μm / km, significantly lower than that of Comparative Example 1 (22.64 μm / km), a reduction of nearly 40%, demonstrating excellent wear resistance under high-load, long-stroke conditions. Example 1 also showed a significant advantage compared to Comparative Example 2 (18.61 μm / km). Comparative Example 3 did not provide wear data, indicating that it failed to complete the 50km wear test under high-load, silicone-free lubrication conditions, and its wear resistance was far lower than that of Comparative Example 1.

[0097] In terms of mechanical properties, the tensile strength of Example 1 was 52.2 MPa, significantly higher than that of Comparative Example 1 (47.1 MPa) and also much higher than that of Comparative Example 3 (30.5 MPa). The tensile modulus of elasticity of Example 1 was 1466 MPa, higher than that of Comparative Example 1 (1351 MPa) and significantly better than that of Comparative Example 3 (691 MPa), indicating that Example 1 has higher structural rigidity and load-bearing capacity. Although the tensile strength (53.4 MPa) and elastic modulus (1482 MPa) of Comparative Example 2 were similar to those of Example 1, its coefficient of friction and linear wear rate were still higher than those of Example 1, indicating that it failed to achieve the same level in terms of friction reduction and wear resistance.

[0098] In terms of hardness, Example 1 has a hardness of 74D, which is higher than Comparative Example 1 (68D) and Comparative Example 3 (62D), demonstrating better material density and resistance to surface deformation.

[0099] In summary, the high-strength wear-resistant composite material for building seismic isolation bearings provided by this invention achieves stable friction coefficient, ultra-wear resistance, and synergistic improvement in strength and modulus under high load (60MPa) conditions, exhibiting superior comprehensive mechanical properties, friction properties, and wear resistance.

[0100] 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 high-strength wear-resistant composite material for building seismic isolation bearings, characterized in that, The high-strength wear-resistant composite material for building seismic isolation bearings comprises the following raw material components in parts by weight: 40-80 parts aliphatic polyketone, 10-20 parts high-styrene resin modified methyl vinyl silicone rubber, 10-20 parts silicone resin, 10-20 parts brominated butyl rubber, 10-20 parts polytetrafluoroethylene, 1-10 parts functional filler, 1-5 parts lubricant, 1-5 parts compatibilizer, and 1-3 parts coupling agent; The functional filler comprises the following raw material components: maleimide-modified diatomaceous earth, graphene, and carbon black; the preparation method of the polystyrene resin-modified methyl vinyl silicone rubber comprises 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 high-strength 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 high-strength 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 high-strength wear-resistant composite material for building seismic isolation bearings as described in claim 1, characterized in that: The functional filler comprises maleimide-modified diatomaceous earth, graphene, and carbon black in a mass ratio of 1:2:5 to 1:3:

5.

5. The high-strength wear-resistant composite material for building seismic isolation bearings as described in claim 4, characterized in that: The preparation method of the maleimide-modified diatomite includes the following steps: acid washing and filtration of diatomite to obtain pretreated diatomite. Maleimide propyltrimethoxysilane was mixed with a hydrolysate and hydrolyzed for 20-30 minutes to obtain a modified solution. The modified liquid is mixed evenly with the pretreated diatomaceous earth, heated to 70-80℃ for modification treatment, solid-liquid separation, and drying to obtain maleimide-modified diatomaceous earth.

6. The high-strength wear-resistant composite material for building seismic isolation bearings as described in claim 5, characterized in that: Acid washing was performed using a 0.1-0.2 mol / L hydrochloric acid solution; the mass-to-volume ratio of the diatomaceous earth to the hydrochloric acid solution was 1 g:8 mL - 1 g:10 mL. The hydrolysate is anhydrous ethanol with a pH of 4.5-4.8; The mass ratio of maleimide propyltrimethoxysilane to hydrolysate is 1g:200mL-1g:250mL; The volume-to-mass ratio of the modified liquid to the pretreated diatomaceous earth is 20 mL:1 g to 25 mL:1 g; The modification treatment takes 2-3 hours.

7. The high-strength wear-resistant composite material for building seismic isolation bearings as described in claim 1, 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; The lubricant is methyl silicone oil, methyl phenyl silicone oil, polyethylene wax, or Fischer-Tropsch wax; The compatibilizer is maleic anhydride-grafted polypropylene. The coupling agent is a titanate coupling agent.

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

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