High-thermal-conductivity 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 thermal conductivity and wear-resistant composite material for building seismic isolation bearings and its preparation method. The high thermal conductivity and wear-resistant composite material for building seismic isolation bearings comprises the following raw material components: aliphatic polyketone, high-styrene resin modified methyl vinyl silicone rubber, silicone resin, polytetrafluoroethylene, thermally conductive components, lubricant, compatibilizer, light stabilizer, antioxidant, and coupling agent; the thermally conductive components include the following raw material components: flake natural graphite, hexagonal boron nitride, and expanded graphite. The high thermal conductivity and wear-resistant composite material for building seismic isolation bearings of this invention exhibits high strength, stable energy dissipation performance, excellent thermal conductivity and heat dissipation capacity, and long-term wear resistance and durability under high temperature, high pressure, large displacement, and multi-cycle comprehensive working conditions, thereby effectively overcoming the problems of softening and heating, severe wear, and performance degradation of existing bridge seismic bearing materials during strong earthquakes and long-term service.

Description

Technical Field

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

[0002] In recent years, with the widespread application of long-span, multi-connected continuous bridges and seismic isolation and damping designs, bridge seismic bearings have revealed significant material limitations under the combined conditions of strong earthquakes and long-term traffic loads. On the one hand, traditional plate rubber bearings, high-damping rubber bearings, and lead-core rubber bearings generally use natural rubber or high-damping rubber modified with damping resin and fillers as the main working material. These materials rely on viscoelastic energy dissipation to provide seismic isolation and vibration reduction functions under seismic action. However, rubber itself has a low thermal conductivity and limited heat resistance. Under the combined action of internal friction and heat generation generated by repeated earthquakes and vehicle loads and high ambient temperature, the heat inside and on the surface of the bearing is difficult to dissipate in time, and the local temperature rises rapidly. This easily leads to rubber softening, significant drift in shear modulus and damping characteristics, intensified compression creep, and accelerated thermo-oxidative aging, hardening cracking, and interface debonding, thereby causing failures such as bearing bulging, shear instability, edge cracking, and delamination. At the same time, under the coupled working conditions of "high temperature + high contact pressure + large displacement and multiple cycles", the wear resistance and fatigue wear resistance of the rubber layer are limited. When there is slight slippage or relative displacement with the restraint members or adjacent members, damage such as fuzzing, wear, and peeling is likely to occur. The damage accumulation after strong earthquakes is obvious, making it difficult to meet the requirements for long service life.

[0003] On the other hand, to reduce friction and achieve controllable displacement, friction pendulum bearings and sliding bearings commonly use polytetrafluoroethylene (PTFE), modified ultra-high molecular weight polyethylene, and some engineering plastics as sliding or friction surface materials. These materials initially have a low coefficient of friction and certain wear resistance, but under conditions of no lubrication, high contact stress, and large displacement reciprocating sliding, they are prone to severe wear and a large amount of wear debris, resulting in deterioration of surface roughness. Under the combined effect of frictional heating and high ambient temperature, cold flow and creep deformation can also occur, forming contact defects such as grooves and steps. This causes the coefficient of friction to fluctuate drastically with temperature and wear, leading to uneven bearing displacement response, local jamming, or even seizing failure. In addition, most engineering plastics have high stiffness and low damping, and they provide almost no energy dissipation capacity themselves. They can only be used as friction-reducing elements. Their matching degree with flexible energy-dissipating rubber layers in terms of stiffness, deformation, and durability is limited, and the overall performance of the system under strong earthquakes and long-term service conditions is still difficult to achieve.

[0004] In summary, there is currently a lack of composite rubber-plastic bearing working materials that can still possess high strength, stable energy dissipation performance, high temperature resistance, and high wear resistance under comprehensive working conditions of high temperature, high pressure, large displacement, and multiple cycles. This provides a realistic need and technical space for the subsequent development of high temperature and wear-resistant composite rubber-plastic materials. Summary of the Invention

[0005] In view of this, the present invention provides a high thermal conductivity and 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: The first aspect of this invention provides a high thermal conductivity and wear-resistant composite material for building seismic isolation bearings, the high thermal conductivity and wear-resistant composite material for building seismic isolation bearings comprising the following raw material components in parts by weight: 40-70 parts aliphatic polyketone, 10-15 parts high polystyrene resin modified methyl vinyl silicone rubber, 10-30 parts silicone resin, 10-15 parts polytetrafluoroethylene, 5-20 parts thermally conductive component, 1-5 parts lubricant, 1-5 parts compatibilizer, 1-3 parts light stabilizer, 1-3 parts antioxidant, and 1-5 parts coupling agent; The thermally conductive component includes the following raw material components: flake natural graphite, hexagonal boron nitride, and expanded graphite.

[0007] Compared to existing technologies, the high thermal conductivity and wear-resistant composite material for building seismic isolation bearings described in this invention uses aliphatic polyketone as the main thermoplastic matrix. Relying on its high crystallinity and dense chain segment stacking, it can form a continuous and stable thermally conductive skeleton when filled with thermally conductive components. This rapidly conducts and diffuses the frictional heat generated at the sliding interface and the heat from the external environment from the local contact area to the interior and outer structure of the bearing, avoiding excessive local temperature rise that could lead to softening deformation and contact stress imbalance. Moreover, its high strength and wear resistance prevent the thermally conductive skeleton from being rapidly worn down under high contact pressure and reciprocating sliding conditions, providing reliable support for the subsequent thermally conductive network and self-lubricating transfer film. Polystyrene resin-modified methyl vinyl silicone rubber is dispersed in an aliphatic polyketide matrix as a fine elastic phase. The styrene segments improve the compatibility of the rubber phase with polyketide and silicone resin, and form a certain polarity and rigidity gradient in the transition zone of the rubber phase interface. In the thermally conductive skeleton, this flexible phase can not only transfer heat in synergy with the matrix, but also absorb the thermal stress caused by traffic loads and temperature differences through elastic deformation, reduce the risk of cracking and detachment of the thermally conductive filler and skeleton in thermal cycling, and ensure the integrity of the thermal conduction path and wear-resistant interface. Silicone resin, through its Si-O backbone and methyl / phenyl side groups, is highly compatible with the silicone rubber phase. It is preferentially enriched around the aliphatic polyketone, silicone rubber phase, thermally conductive filler, and polytetrafluoroethylene (PTFE) by means of active groups such as hydroxyl and vinyl groups. During melt processing, it forms an inorganic-organic composite three-dimensional cross-linked network and a locally "micro-ceramicized" skeleton, enabling the material to maintain good rigidity and dimensional stability at high temperatures. Simultaneously, it improves interfacial thermal conductivity and reduces the thermal resistance at the thermally conductive filler / matrix interface, thereby enhancing the overall volumetric thermal conductivity and high-temperature wear resistance of the support plastic. PTFE, in micro-powder form, is uniformly embedded in the aforementioned thermally conductive skeleton and elastic network. Under friction and shear, it continuously migrates to the sliding surface, forming a dense solid lubrication transfer film. This not only significantly reduces the friction coefficient during startup and operation, and decreases the instantaneous generation of frictional heat, but also forms a "soft slip layer" on the rigid support layer composed of silicone resin and aliphatic polyketone. This prevents direct plowing and adhesive wear of the thermally conductive filler and matrix by the metal mating parts, thus ensuring the integrity and continuity of the thermally conductive network during long-term service.

[0008] The thermally conductive components, including flake natural graphite, hexagonal boron nitride, and expanded graphite, constitute a composite functional system with high thermal conductivity, lightweight, and fatigue resistance. The flake natural graphite and expanded graphite form oriented, multi-layered thermal conductive pathways within the rubber-plastic matrix, significantly improving the material's thermal diffusion efficiency. This allows for the timely conduction and dissipation of endogenous heat generated by the support under cyclic shear deformation and long-term loading, thereby reducing the risk of softening and aging due to heat accumulation. Simultaneously, the flake graphite structure acts as a micro-slip buffer and self-lubricant during stress, improving the stability of the friction interface and enhancing... High wear resistance, combined with its low cost, easy mass production and good processing and dispersibility, can achieve a comprehensive improvement in thermal conductivity, durability and economy while ensuring mechanical properties and damping characteristics. Hexagonal boron nitride has high thermal conductivity and forms continuous heat conduction channels by overlapping with flake natural graphite and expanded graphite in the matrix, which significantly improves the thermal conductivity of the material and accelerates the conduction and dissipation of internal heat and frictional heat. At the same time, its layered crystals play a solid lubrication and surface protection role at the shear interface, slowing down the propagation of surface microcracks and abrasive wear.

[0009] Lubricants improve melt flowability and phase dispersion during processing, and synergistically reduce internal and interfacial shear friction, thus minimizing instantaneous temperature rise and wear, in conjunction with polytetrafluoroethylene (PTFE), hexagonal boron nitride (HBO), and expanded graphite during service. Compatibilizers enhance the compatibility of different polymer phases, such as aliphatic polyketides, polystyrene-modified methyl vinyl silicone rubber, and PTFE, by bridging molecular bridges between organic phases. This allows for the formation of a more stable interpenetrating network in the multiphase system, which is beneficial for the uniform dispersion of thermally conductive components and the continuity of the thermally conductive network. Light stabilizers inhibit photo-oxidative degradation and chain segmentation of the polymer matrix by absorbing or quenching free radicals generated by ultraviolet radiation. Fracture resistance improves the material's weather resistance and mechanical property retention under long-term outdoor service conditions; antioxidants can delay the thermal oxidation reaction of the matrix resin by capturing peroxide free radicals generated during thermo-oxidative aging or decomposing peroxides, maintaining the material's strength, toughness, and interfacial bonding stability, and ensuring the long-term reliability of the support under cyclic loading and temperature rise environments; coupling agents form an organic-inorganic interface layer on the surface of flake natural graphite, hexagonal boron nitride, and expanded graphite, enhancing the interfacial bonding between inorganic fillers and organic matrix, reducing interfacial thermal resistance and stress concentration, and preventing interfacial debonding and microcrack initiation under high temperature and repeated cyclic loading.

[0010] Through the synergistic effect of the above components on multiple scales such as macroscopic load bearing, microscopic energy dissipation, thermal conductivity and heat dissipation, and interface bonding, the high thermal conductivity and wear-resistant composite material for building seismic isolation bearings of the present invention possesses high strength, stable energy dissipation performance, excellent thermal conductivity and heat dissipation capacity, and long-term wear resistance and durability under comprehensive working conditions of high temperature, high pressure, large displacement, and multiple cycles. This effectively overcomes the problems of softening and heating, severe wear, and performance degradation of existing bridge seismic bearing materials during strong earthquakes and long-term service.

[0011] Preferably, 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°C for 1-2 hours to obtain the polystyrene resin modified methyl vinyl silicone rubber.

[0012] 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.

[0013] 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℃.

[0014] More preferably, in S2, the holding time for the polymerization reaction is 30-40 minutes.

[0015] More preferably, the organic solvent is toluene and ethyl acetate in a volume ratio of 1:1 to 1:2.

[0016] More preferably, the initiator is azobisisobutyronitrile.

[0017] More preferably, the stabilizer is divinylbenzene.

[0018] Preferably, the thermally conductive component comprises the following raw material components in the following mass percentages: 20-30% flake natural graphite, 5%-8% hexagonal boron nitride, and the balance expanded graphite.

[0019] Preferably, the aspect ratio of the flake natural graphite is 30-100 and the thickness is 5-10 μm.

[0020] Preferably, the specific surface area of ​​the hexagonal boron nitride is 5-25 m². 2 / g, with a particle size of 150-300nm.

[0021] Preferably, the specific surface area of ​​the expanded graphite is 20-60 m². 2 / g, with a particle size of 100-200nm.

[0022] 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.

[0023] Preferably, the polytetrafluoroethylene is polytetrafluoroethylene micro powder with a particle size of 0.5-20 μm.

[0024] Preferably, the lubricant is methylphenyl silicone oil, methyl silicone oil, polyethylene wax, or Fischer-Tropsch wax.

[0025] Preferably, the compatibilizer is maleic anhydride-grafted polypropylene.

[0026] Preferably, the light stabilizer is UV-531.

[0027] Preferably, the antioxidant is BASF 1010.

[0028] Preferably, the coupling agent is a titanate coupling agent.

[0029] The second aspect of the present invention provides a method for preparing the high thermal conductivity and wear-resistant composite material for building seismic isolation bearings, comprising the following steps: the high thermal conductivity and wear-resistant composite material for building seismic isolation bearings is prepared by any one of compression molding, injection molding or extrusion calendering.

[0030] Preferably, the compression molding method includes the following steps: Step 1: Weigh each component raw material according to the design ratio, mix them evenly to obtain the mixture; Step 2: Heat the mixture to 230-270℃ and mold it, then cool it down and remove it from the mold to obtain a high thermal conductivity and wear-resistant composite material for building seismic isolation bearings.

[0031] Preferably, the injection molding method includes the following steps: 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. 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 thermal conductivity and wear-resistant composite material for building vibration damping and isolation bearings.

[0032] In a further preferred embodiment, step two also includes an injection speed of 40-50 mm / s.

[0033] In summary, the high thermal conductivity and wear-resistant composite material for building seismic isolation bearings described in this invention can simultaneously achieve high load-bearing capacity, high thermal conductivity and heat dissipation, and excellent wear resistance under actual seismic conditions of high temperature, high pressure, large displacement, and multiple cycles. It effectively solves the problems of softening, heat generation, wear, and performance degradation of traditional bridge seismic bearings during strong earthquakes and long-term service from the material level. Detailed Implementation

[0034] 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.

[0035] The preparation methods of the polystyrene resin modified methyl vinyl silicone rubber described in the following embodiments and comparative examples include the following steps: S1. 500g of methyl vinyl silicone rubber is kept at 80-100℃ for 50-70min to obtain pretreated methyl vinyl silicone rubber. 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. S3. The precursor is kept at 100°C for 1 hour to obtain the polystyrene resin modified methyl vinyl silicone rubber.

[0036] The flake natural graphite described in the following embodiments and comparative examples has an aspect ratio of 40 and a thickness of 5 μm.

[0037] The specific surface area of ​​the hexagonal boron nitride described in the following embodiments and comparative examples is 20 m². 2 / g, with a particle size of 200nm.

[0038] The specific surface area of ​​the expanded graphite described in the following embodiments and comparative examples is 40 m². 2 / g, with a particle size of 150nm.

[0039] The melt flow rate of the aliphatic polyketones described in the following examples and comparative examples was 15 g / 10 min at 240 °C and 2.16 kg; the weight-average molecular weight of the aliphatic polyketones was 200,000 and the polydispersity index (PDI) was 2.8.

[0040] The polytetrafluoroethylene described in the following examples and comparative examples is polytetrafluoroethylene micro powder with a particle size of 5 μm.

[0041] The light stabilizer described in the following examples and comparative examples is UV-531.

[0042] The antioxidant described in the following examples and comparative examples is BASF 1010.

[0043] Unless otherwise stated, all raw materials used in the following examples and comparative examples are commercially available products.

[0044] Example 1 This embodiment provides a high thermal conductivity and wear-resistant composite material for building seismic isolation bearings and its preparation method, specifically including the following: The high thermal conductivity and wear-resistant composite material for building seismic isolation bearings comprises the following raw material components in parts by weight: 50 parts aliphatic polyketone, 12 parts high polystyrene resin modified methyl vinyl silicone rubber, 20 parts silicone resin, 10 parts polytetrafluoroethylene, 15 parts thermally conductive component, 3 parts methyl phenyl silicone oil, 4 parts maleic anhydride grafted polypropylene, 3 parts UV-531, 3 parts BASF 1010, and 3 parts titanate coupling agent; The thermally conductive component comprises the following raw material components in weight percentage: 22% flake natural graphite, 7% hexagonal boron nitride, and the balance expanded graphite.

[0045] The preparation method of the high thermal conductivity and wear-resistant composite material for building seismic isolation bearings includes the following steps: Step 1: Weigh each component raw material according to the design ratio, mix them evenly to obtain the mixture; Step 2: Heat the mixture to 230°C and mold it, then cool it down and remove it from the mold to obtain a high thermal conductivity and wear-resistant composite material for building seismic isolation bearings.

[0046] Example 2 This embodiment provides a high thermal conductivity and wear-resistant composite material for building seismic isolation bearings and its preparation method, specifically including the following: The high thermal conductivity and wear-resistant composite material for building seismic isolation bearings comprises the following raw material components in parts by weight: 70 parts aliphatic polyketone, 10 parts high polystyrene resin modified methyl vinyl silicone rubber, 15 parts silicone resin, 10 parts polytetrafluoroethylene, 15 parts thermally conductive component, 3 parts methyl silicone oil, 4 parts maleic anhydride grafted polypropylene, 3 parts UV-531, 2 parts BASF 1010, and 3 parts titanate coupling agent; The thermally conductive component comprises the following raw material components in the following mass percentages: 30% flake natural graphite, 8% hexagonal boron nitride, and the balance expanded graphite.

[0047] The preparation method of the high thermal conductivity and wear-resistant composite material for building seismic isolation bearings includes the following steps: Step 1: Weigh each component raw material according to the design ratio, mix them evenly to obtain the mixture; 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 thermal conductivity and wear-resistant composite material for building seismic isolation bearings.

[0048] Example 3 This embodiment provides a high thermal conductivity and wear-resistant composite material for building seismic isolation bearings and its preparation method, specifically including the following: The high thermal conductivity and wear-resistant composite material for building seismic isolation bearings comprises the following raw material components in parts by weight: 40 parts aliphatic polyketone, 15 parts high polystyrene resin modified methyl vinyl silicone rubber, 30 parts silicone resin, 15 parts polytetrafluoroethylene, 15 parts thermally conductive component, 3 parts polyethylene wax, 4 parts maleic anhydride grafted polypropylene, 3 parts UV-531, 3 parts BASF 1010, and 3 parts titanate coupling agent; The thermally conductive component comprises the following raw material components in the following mass percentages: 30% flake natural graphite, 5% hexagonal boron nitride, and the balance expanded graphite.

[0049] The preparation method of the high thermal conductivity and wear-resistant composite material for building seismic isolation bearings includes the following steps: 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. 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 1 210℃, Section 2 215℃, Section 3 220℃, Section 4 230℃, and nozzle 235℃; 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 thermal conductivity and wear-resistant composite material for building vibration damping and isolation bearings.

[0050] Comparative Example 1 This comparative example provides a high thermal conductivity and wear-resistant composite material for building seismic isolation bearings. The difference from Example 1 is that the high polystyrene 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.

[0051] Comparative Example 2 This comparative example provides a high thermal conductivity and wear-resistant composite material for building seismic isolation bearings. The difference from Example 1 is that the thermally conductive component is replaced with an equal amount of expanded graphite, while other components and processes remain unchanged, which will not be described in detail here.

[0052] Comparative Example 3 This comparative example provides a high thermal conductivity and 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 (molecular weight of 9 million), while other components and processes remain unchanged, which will not be described in detail here.

[0053] To further verify the technical effects of the present invention, the high thermal conductivity and 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.

[0054] Referring to GB / T 32064-2015, the thermal conductivity of the high thermal conductivity and wear-resistant composite materials for building seismic isolation bearings obtained in Examples 1-3 and Comparative Examples 1-3 was tested at 25℃ and 60℃. The test results are shown in Table 2.

[0055] Table 1. Performance test results of high thermal conductivity and wear-resistant composite materials for building seismic isolation bearings obtained from each embodiment and comparative example.

[0056] Table 2 shows the test results of the thermal conductivity of the high thermal conductivity and wear-resistant composite material for building seismic isolation bearings obtained from each embodiment and comparative example.

[0057] 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 thermal conductivity and wear-resistant composite material for building seismic isolation bearings, characterized in that, The high thermal conductivity and wear-resistant composite material for building seismic isolation bearings comprises the following raw material components in parts by weight: 40-70 parts aliphatic polyketone, 10-15 parts high polystyrene resin modified methyl vinyl silicone rubber, 10-30 parts silicone resin, 10-15 parts polytetrafluoroethylene, 5-20 parts thermally conductive components, 1-5 parts lubricant, 1-5 parts compatibilizer, 1-3 parts light stabilizer, 1-3 parts antioxidant, and 1-5 parts coupling agent; The thermally conductive component includes the following raw material components: flake natural graphite, hexagonal boron nitride, and expanded graphite.

2. The high thermal conductivity and wear-resistant composite material for building seismic isolation bearings as described in claim 1, characterized in that, 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.

3. The high thermal conductivity and wear-resistant composite material for building seismic isolation bearings as described in claim 2, 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.

4. The high thermal conductivity and wear-resistant composite material for building seismic isolation bearings as described in claim 2 or 3, 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.

5. The high thermal conductivity and wear-resistant composite material for building seismic isolation bearings as described in claim 1, characterized in that: The thermally conductive component comprises the following raw material components in the following mass percentages: 20%-30% flake natural graphite, 5%-8% hexagonal boron nitride, and the balance expanded graphite.

6. The high thermal conductivity and wear-resistant composite material for building seismic isolation bearings as described in claim 5, characterized in that: The aspect ratio of the flake-shaped natural graphite is 30-100, and the thickness is 5-10 μm; The specific surface area of ​​the hexagonal boron nitride is 5-25 m². 2 / g, with a particle size of 150-300nm; The specific surface area of ​​the expanded graphite is 20-60 m². 2 / g, with a particle size of 100-200nm.

7. The high thermal conductivity and 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.

8. The high thermal conductivity and wear-resistant composite material for building seismic isolation bearings as described in claim 1, characterized in that: The lubricant is methylphenyl silicone oil, methyl silicone oil, polyethylene wax, or Fischer-Tropsch wax; The compatibilizer is maleic anhydride-grafted polypropylene. The light stabilizer is UV-531; The antioxidant is BASF 1010; The coupling agent is a titanate coupling agent.

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

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