Composite sliding plate containing ultra-high molecular weight polyethylene as well as preparation method and application of composite sliding plate

Abstract

The invention relates to the technical field of sliding materials for shock absorption and isolation supports, and particularly discloses a composite sliding plate containing ultra-high molecular weight polyethylene as well as a preparation method and application of the composite sliding plate. The composite sliding plate containing the ultra-high molecular weight polyethylene comprises a working layer material and a base layer material from top to bottom, the working layer material comprises the following raw material components: ultra-high molecular weight polyethylene, trimethylolpropane modified polytetrafluoroethylene, a lubricant, an inorganic filler, a compatilizer and a coupling agent; the base layer material comprises the following raw material components: ultra-high molecular weight polyethylene, molybdenum disulfide coated carbon fibers, graphene and a coupling agent. The prepared composite sliding plate has high compressive strength, excellent wear resistance and excellent creep resistance. By means of the technical scheme, the problems that in the prior art, a sliding material for a seismic mitigation and isolation support is low in compressive strength, poor in wear resistance and poor in creep resistance are effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of sliding materials for shock-absorbing bearings, and specifically discloses a composite slide plate containing ultra-high molecular weight polyethylene, a preparation method thereof, and an application thereof. Background Art

[0002] The reason for the falling of the bridge slab from the pier beam is that when strong winds blow across the bridge or the external vibration pressure is too high, a large horizontal force and vertical force are generated, causing the precast bridge slab to undergo horizontal displacement and vertical displacement. When the displacement exceeds the laying width of the precast bridge slab on the pier, the bridge slab will fall. At this time, not only the bridge is damaged, but also there are major safety hazards for pedestrians and vehicles on and under the bridge.

[0003] To solve this safety hazard, engineers have developed bridge seismic bearings. It has sufficient vertical stiffness to bear vertical loads and can reliably transfer the pressure of the superstructure to the pier and abutment; at the same time, it has good elasticity to adapt to the rotation of the beam end and has a large shear deformation to meet the horizontal displacement of the superstructure. However, with the increasing demand for bridge bearings, more and more environmental and technical problems are faced in bridge construction, and the design requirements are getting higher and higher. Therefore, traditional slide plates for bridge bearings are increasingly unable to meet the design requirements of new bearings.

[0004] In the prior art, polytetrafluoroethylene slide plates are mainly used. They have good self-lubricity and low friction coefficients, but their compressive properties are poor and cannot meet the design requirements of seismic isolation bearings. There are also reports on composite slide plates obtained by modifying polytetrafluoroethylene. Although their compressive strength and wear resistance have been improved, their lubrication performance is poor and cannot meet the design requirements of friction pendulum seismic isolation bearings. Ultra-high molecular weight polyethylene slide plates have high compressive strength and excellent wear resistance under the condition of having silicone grease. However, under the condition of no silicone grease lubrication, their thermal conductivity is poor, and the heat generated during the friction process cannot be effectively dissipated, easily resulting in deformation of the slide plate surface.

[0005] Based on this, it is of great practical significance to develop a sliding material for seismic isolation bearings that can maintain a low friction coefficient and has excellent anti-creep performance even under the condition of no silicone grease lubrication. Summary of the Invention

[0006] Aiming at the problems that the sliding materials used in seismic isolation bearings in the prior art have low compressive strength, poor wear resistance and poor creep resistance, the present invention provides a composite slide plate containing ultra-high molecular weight polyethylene, its preparation method and application. The composite slide plate includes a working layer and a base layer from top to bottom. Among them, the raw materials of the working layer include ultra-high molecular weight polyethylene, trimethylolpropane modified polytetrafluoroethylene, lubricant, inorganic filler, compatibilizer and coupling agent; the raw materials of the base layer include ultra-high molecular weight polyethylene, molybdenum disulfide coated carbon fiber, graphene and coupling agent. The composite slide plate has high compressive strength, excellent wear resistance and creep resistance, effectively making up for the deficiencies of the existing sliding materials for bridge bearings.

[0007] In order to achieve the above invention purpose, the present invention provides the following technical solutions: The first aspect of the present invention provides a composite slide plate containing ultra-high molecular weight polyethylene. The composite slide plate containing ultra-high molecular weight polyethylene includes a working layer material and a base layer material from top to bottom; Among them, the working layer material includes the following raw material components in parts by mass: 80-120 parts of ultra-high molecular weight polyethylene, 20-50 parts of trimethylolpropane modified polytetrafluoroethylene, 1-5 parts of lubricant, 1-5 parts of inorganic filler, 1-3 parts of compatibilizer and 1-3 parts of coupling agent; The base layer material includes the following raw material components in parts by mass: 80-120 parts of ultra-high molecular weight polyethylene, 5-10 parts of molybdenum disulfide coated carbon fiber, 1-5 parts of graphene and 1-3 parts of coupling agent.

[0008] Compared with the prior art, the present invention provides a composite skateboard composed of a working layer material and a base layer material. Among them, the working layer material is prepared from ultra-high molecular weight polyethylene and trimethylolpropane modified polytetrafluoroethylene as the main raw materials, supplemented with lubricants, inorganic fillers, compatibilizers and coupling agents; the base layer material is prepared from ultra-high molecular weight polyethylene and molybdenum disulfide-coated carbon fiber as the main raw materials, supplemented with graphene and coupling agents. Among them, the present invention adds ultra-high molecular weight polyethylene to both the working layer material and the base layer material. The ultra-high molecular weight polyethylene has excellent self-lubricating properties, can effectively reduce friction, reduce energy loss, and extend the service life of bridge production. Moreover, ultra-high molecular weight polyethylene has good tolerance to many chemical substances and is not easily chemically corroded, which enables the bridge bearing to work normally in harsh natural environments, improving the safety and reliability of the bridge. More importantly, ultra-high molecular weight polyethylene has a high impact strength and can withstand large impact forces, protecting the overall stability of the bridge. The present invention also adds trimethylolpropane modified polytetrafluoroethylene to the working layer material. Ordinary polytetrafluoroethylene materials have poor anti-creep performance and low friction coefficient. After being modified by trimethylolpropane, the defects of polytetrafluoroethylene can be effectively compensated, and the wear resistance of polytetrafluoroethylene materials can be improved. Moreover, trimethylolpropane modified polytetrafluoroethylene has a high load-bearing capacity and high wear resistance, can withstand the weight and impact during the use of the bridge bearing, and improves the safety of the bridge.

[0009] The present invention also adds molybdenum disulfide-coated carbon fiber as the main raw material to the base layer material. Carbon fiber itself has excellent mechanical properties, chemical stability and the characteristics of light weight and high strength, which helps to maintain the stability of the bridge structure. Molybdenum disulfide has a low friction coefficient. Coating it on the surface of carbon fiber can reduce the frictional resistance during the use of the bridge bearing, reduce the wear between components, and thus improve the service life and operation efficiency of the bridge bearing. Moreover, the lubricating effect of molybdenum disulfide can make the stress distribution between carbon fibers more uniform, avoid local stress concentration, and thus improve the overall strength and toughness of the bridge isolation bearing. The composite skateboard has high compressive strength, excellent wear resistance and anti-creep performance. The technical solution of the present invention effectively solves the problems of low compressive strength, poor wear resistance and poor anti-creep performance of the slip materials used in the existing isolation bearings.

[0010] Preferably, the preparation method of the trimethylolpropane modified polytetrafluoroethylene includes the following steps: S1. Disperse polytetrafluoroethylene in an organic solvent, add a silane coupling agent, mix evenly, and irradiate with microwave for 1-2 min to obtain a polytetrafluoroethylene suspension; S2. Add trimethylolpropane to the polytetrafluoroethylene suspension, stir and react at 70 - 80 °C under an inert atmosphere, filter, and dry to obtain trimethylolpropane-modified polytetrafluoroethylene.

[0011] Further preferably, in S1, the organic solvent is a mixed solvent of ethyl acetate and ethanol with a volume ratio of 1:2 - 1:5.

[0012] Further preferably, in S1, the mass-volume ratio of polytetrafluoroethylene to the organic solvent is 1 g:5 mL - 1 g:10 mL.

[0013] Further preferably, in S1, the addition amount of the silane coupling agent is 5% - 8% of the mass of polytetrafluoroethylene.

[0014] Further preferably, in S1, the power of the microwave irradiation is 1000 - 1500 W.

[0015] Further preferably, in S2, the mass ratio of trimethylolpropane to polytetrafluoroethylene is 1:3 - 1:5.

[0016] Further preferably, in S2, the stirring reaction time is 6 - 8 h.

[0017] Preferably, the preparation method of the molybdenum disulfide-coated carbon fiber includes the following steps: Step a. Dissolve the molybdenum source and the sulfur source in deionized water respectively, mix evenly to obtain an inorganic mixed solution; Step b. Immerse the short-cut carbon fiber in an acid solution for activation, perform solid-liquid separation to obtain activated carbon fiber; Step c. Disperse the activated carbon fiber in the inorganic mixed solution, perform a hydrothermal reaction at 160 - 200 °C, perform solid-liquid separation, and dry to obtain the molybdenum disulfide-coated carbon fiber.

[0018] Further preferably, in step a, the molybdenum source is any one of ammonium molybdate, sodium molybdate, or molybdenum chloride.

[0019] Further preferably, in step a, the sulfur source is any one of thiourea, thioacetamide, ammonium sulfide, or sodium sulfide.

[0020] Further preferably, in step a, the molar ratio of molybdenum in the molybdenum source to sulfur in the sulfur source is 1:2 - 1:3.

[0021] Further preferably, in step a, the mass ratio of the molybdenum source to the deionized water is 1:80 - 1:100.

[0022] Further preferably, in step b, the mass-volume ratio of the short-cut carbon fiber to the acid solution is 1 g:5 mL - 1 g:8 mL.

[0023] More preferably, in step b, the acid solution is a hydrofluoric acid solution and a hydrochloric acid solution with a volume ratio of 1:10 - 1:15.

[0024] More preferably, in step b, the length of the chopped carbon fiber is 0.5 - 1 mm.

[0025] Even more preferably, the concentration of the hydrofluoric acid solution is 0.5 - 1 mol / L.

[0026] Even more preferably, the concentration of the hydrochloric acid solution is 0.5 - 1 mol / L.

[0027] More preferably, in step b, activation is carried out by ultrasonic treatment.

[0028] Even more preferably, in step b, the frequency of the ultrasonic treatment is 30 - 35 kW.

[0029] Even more preferably, in step b, the time of the ultrasonic treatment is 20 - 30 min.

[0030] More preferably, in step c, the mass ratio of the activated carbon fiber to the molybdenum source in the inorganic mixed solution is 10:1 - 10:3.

[0031] More preferably, in step c, the time of the hydrothermal reaction is 16 - 20 h.

[0032] Preferably, the molecular weight of the ultra-high molecular weight polyethylene is 8 million - 10 million.

[0033] More preferably, the molecular weight of the ultra-high molecular weight polyethylene is 9 million.

[0034] Preferably, the inorganic filler is activated carbon and calcium sulfate with a mass ratio of 1:5 - 1:10.

[0035] More preferably, the specific surface area of the activated carbon is 500 - 2000 m 2 / g.

[0036] Preferably, the lubricant is methyl silicone oil.

[0037] More preferably, the lubricant is dimethyl silicone oil or benzyl silicone oil.

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

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

[0040] In the second aspect of the present invention, a method for preparing the composite slide plate containing ultra-high molecular weight polyethylene is provided, including the following steps: Step 1: Weigh the raw materials of each component of the slide plate according to the designed ratio. Dissolve the coupling agent in water, add the inorganic filler to obtain a first mixture. Then, sequentially add ultra-high molecular weight polyethylene, lubricant, trimethylolpropane-modified polytetrafluoroethylene, and compatibilizer to the first mixture and mix evenly to obtain the working layer material. Step 2: Weigh the raw materials of each component of the substrate according to the designed ratio. Dissolve the coupling agent in water, add graphene to obtain a second mixture. Then, sequentially add ultra-high molecular weight polyethylene and molybdenum disulfide-coated carbon fiber to the second mixture and mix evenly to obtain the base layer material. Step 3: Lay and distribute the base layer material and the working layer material flat in sequence from bottom to top, and carry out compression molding at 240 - 270 °C, then cool down and take out of the mold to obtain the composite slide plate containing ultra-high molecular weight polyethylene.

[0041] Preferably, in Step 1 and Step 2, the mass ratio of the coupling agent to water is 1:3 - 1:5.

[0042] Preferably, in Step 3, the pressure of the compression molding is 10 - 15 MPa.

[0043] In the second aspect of the present invention, an application of the composite slide plate containing ultra-high molecular weight polyethylene or the composite slide plate containing ultra-high molecular weight polyethylene prepared by using the method for preparing the composite slide plate containing ultra-high molecular weight polyethylene in the preparation of bridge isolation bearings is provided.

[0044] In summary, the present invention designs a composite slide plate containing ultra-high molecular weight polyethylene including a working layer and a substrate layer from top to bottom. Compared with the prior art, the composite slide plate has high compressive strength, excellent wear resistance, and good anti-creep performance. Using the technical solution of the present invention effectively solves the problems that the slip materials used in isolation bearings in the prior art have low compressive strength, poor wear resistance, and poor anti-creep performance, and provides a new design idea for the slip materials used in bridge isolation bearings. Specific Embodiments

[0045] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0046] Example 1 This example provides a composite slide plate containing ultra-high molecular weight polyethylene and a preparation method thereof, which specifically includes the following content: The composite slide plate containing ultra-high molecular weight polyethylene comprises a working layer material and a base layer material from top to bottom; Among them, the working layer material comprises raw material components in the following mass parts: 100 parts of ultra-high molecular weight polyethylene with a molecular weight of 9 million, 40 parts of trimethylolpropane modified polytetrafluoroethylene, 3 parts of dimethyl silicone oil, 4 parts of inorganic filler, 2 parts of maleic anhydride grafted polypropylene, and 2 parts of titanate coupling agent; among them, the inorganic filler is activated carbon and calcium sulfate with a mass ratio of 1:6.

[0047] The base layer material comprises raw material components in the following mass parts: 100 parts of ultra-high molecular weight polyethylene with a molecular weight of 9 million, 6 parts of molybdenum disulfide coated carbon fiber, 4 parts of graphene, and 3 parts of titanate coupling agent.

[0048] The preparation method of the composite slide plate comprises the following steps: Step 1: Weigh the raw material components of the slide plate according to the designed ratio, dissolve the titanate coupling agent in water according to a mass ratio of 1:3, add the inorganic filler to obtain a first mixture; successively add ultra-high molecular weight polyethylene, dimethyl silicone oil, trimethylolpropane modified polytetrafluoroethylene, and maleic anhydride grafted polypropylene to the first mixture, and mix evenly to obtain the working layer material; Step 2: Weigh the raw material components of the substrate according to the designed ratio, dissolve the titanate coupling agent in water according to a mass ratio of 1:3, add graphene to obtain a second mixture; successively add ultra-high molecular weight polyethylene and molybdenum disulfide coated carbon fiber to the second mixture, and mix evenly to obtain the base layer material; Step 3: Lay the base layer material and the working layer material flat and in sequence from bottom to top, carry out molding by die pressing at 250 °C and 14 MPa, cool down and take out of the mold to obtain the composite slide plate containing ultra-high molecular weight polyethylene.

[0049] Among them, the preparation method of the trimethylolpropane modified polytetrafluoroethylene comprises the following steps: S1. Disperse 50 g of polytetrafluoroethylene in 400 mL of a mixed solvent of ethyl acetate and ethanol with a volume ratio of 1:3, add 3.5 g of silane coupling agent, mix evenly, and carry out microwave irradiation for 1.5 min under the condition of a power of 1200 W to obtain a pretreated polytetrafluoroethylene suspension; S2. Add 10 g of trimethylolpropane to the polytetrafluoroethylene suspension, stir and react at 75 °C for 7 h in an inert atmosphere, filter and dry to obtain trimethylolpropane modified polytetrafluoroethylene.

[0050] The preparation method of the molybdenum disulfide coated carbon fiber comprises the following steps: Step a. Mix 5 g of ammonium molybdate and 5 g of sodium sulfide evenly, dissolve them in 500 mL of deionized water to obtain an inorganic mixed solution; Step b: Immerse 20 g of short carbon fibers with a length of 0.8 mm in a mixed solution of 150 mL of hydrofluoric acid solution and hydrochloric acid solution with a volume ratio of 1:10 for 25 min, perform ultrasonic treatment for 15 min, and perform solid-liquid separation to obtain activated carbon fibers; wherein, the concentration of the hydrofluoric acid solution is 0.5 mol / L; the concentration of the hydrochloric acid solution is 0.8 mol / L; Step c: Disperse the activated carbon fibers in 100 mL of the inorganic mixture, perform hydrothermal reaction at 180 °C for 18 h, perform solid-liquid separation, and dry to obtain the molybdenum disulfide-coated carbon fibers.

[0051] Example 2 This example provides a composite skateboard containing ultra-high molecular weight polyethylene and a preparation method thereof, which specifically includes the following content: The composite skateboard containing ultra-high molecular weight polyethylene includes a working layer material and a base layer material from top to bottom; Among them, the working layer material includes the following raw material components in parts by mass: 80 parts of ultra-high molecular weight polyethylene with a molecular weight of 9 million, 30 parts of trimethylolpropane-modified polytetrafluoroethylene, 3 parts of dimethyl silicone oil, 4 parts of inorganic filler, 2 parts of maleic anhydride-grafted polypropylene, and 2 parts of titanate coupling agent; wherein, the inorganic filler is activated carbon and calcium sulfate with a mass ratio of 1:5.

[0052] The base layer material includes the following raw material components in parts by mass: 80 parts of ultra-high molecular weight polyethylene with a molecular weight of 9 million, 5 parts of molybdenum disulfide-coated carbon fibers, 4 parts of graphene, and 3 parts of titanate coupling agent.

[0053] The preparation method of the composite skateboard includes the following steps: Step one: Weigh the raw material components of the skateboard according to the designed ratio, dissolve the titanate coupling agent in water according to a mass ratio of 1:3, add the inorganic filler to obtain a first mixture; sequentially add ultra-high molecular weight polyethylene, dimethyl silicone oil, trimethylolpropane-modified polytetrafluoroethylene, and maleic anhydride-grafted polypropylene to the first mixture, and mix evenly to obtain the working layer material; Step two: Weigh the raw material components of the substrate according to the designed ratio, dissolve the titanate coupling agent in water according to a mass ratio of 1:3, add graphene to obtain a second mixture; sequentially add ultra-high molecular weight polyethylene and molybdenum disulfide-coated carbon fibers to the second mixture, and mix evenly to obtain the base layer material; Step three: Lay the base layer material and the working layer material flat in sequence from bottom to top, perform molding by pressing at 260 °C and 13 MPa, cool down and take out of the mold to obtain the composite skateboard containing ultra-high molecular weight polyethylene.

[0054] Among them, the preparation method of the trimethylolpropane-modified polytetrafluoroethylene comprises the following steps: S1. Disperse 50 g of polytetrafluoroethylene in 400 mL of a mixed solvent of ethyl acetate and ethanol with a volume ratio of 1:3, add 3.5 g of silane coupling agent, mix evenly, and perform microwave irradiation for 1.5 min under the condition of a power of 1000 W to obtain a pretreated polytetrafluoroethylene suspension; S2. Add 10 g of trimethylolpropane to the polytetrafluoroethylene suspension, stir and react at 75 °C for 7 h under an inert atmosphere, filter and dry to obtain trimethylolpropane-modified polytetrafluoroethylene.

[0055] The preparation method of the molybdenum disulfide-coated carbon fiber comprises the following steps: Step a. Mix 5.3 g of ammonium molybdate and 5.8 g of sodium sulfide evenly, dissolve them in 500 mL of deionized water to obtain an inorganic mixed solution; Step b. Immerse 20 g of short-cut carbon fibers with a length of 0.5 mm in a mixed solution of 150 mL of a hydrofluoric acid solution and a hydrochloric acid solution with a volume ratio of 1:10 for 25 min, perform ultrasonic treatment for 15 min, and perform solid-liquid separation to obtain activated carbon fibers; wherein, the concentration of the hydrofluoric acid solution is 0.5 mol / L; the concentration of the hydrochloric acid solution is 0.8 mol / L; Step c. Disperse the activated carbon fibers in 100 mL of the inorganic mixed solution, perform hydrothermal reaction at 160 °C for 18 h, perform solid-liquid separation and dry to obtain the molybdenum disulfide-coated carbon fiber.

[0056] Example 3 This example provides a composite slide plate containing ultra-high molecular weight polyethylene and its preparation method, which specifically includes the following contents: The composite slide plate containing ultra-high molecular weight polyethylene comprises a working layer material and a base layer material from top to bottom; Among them, the working layer material comprises the following raw material components in parts by mass: 120 parts of ultra-high molecular weight polyethylene with a molecular weight of 9 million, 50 parts of trimethylolpropane-modified polytetrafluoroethylene, 5 parts of benzyl silicone oil, 5 parts of inorganic filler, 3 parts of maleic anhydride-grafted polypropylene, and 3 parts of titanate coupling agent; wherein, the inorganic filler is activated carbon and calcium sulfate with a mass ratio of 1:8.

[0057] The base layer material comprises the following raw material components in parts by mass: 120 parts of ultra-high molecular weight polyethylene with a molecular weight of 9 million, 10 parts of molybdenum disulfide-coated carbon fiber, 5 parts of graphene, and 5 parts of titanate coupling agent.

[0058] The preparation method of the composite slide plate comprises the following steps: Step 1: Weigh the raw materials of each component of the skateboard according to the designed ratio. Dissolve the titanate coupling agent in water according to a mass ratio of 1:3, add the inorganic filler to obtain the first mixture. Then, sequentially add ultra-high molecular weight polyethylene, benzyl silicone oil, trimethylolpropane-modified polytetrafluoroethylene, and maleic anhydride-grafted polypropylene to the first mixture and mix evenly to obtain the working layer material. Step 2: Weigh the raw materials of each component of the substrate according to the designed ratio. Dissolve the titanate coupling agent in water according to a mass ratio of 1:3, add graphene to obtain the second mixture. Then, sequentially add ultra-high molecular weight polyethylene and molybdenum disulfide-coated carbon fiber to the second mixture and mix evenly to obtain the base layer material. Step 3: Lay the base layer material and the working layer material flat and in sequence from bottom to top, and perform molding by die pressing at 240 °C and 15 MPa. Cool down and take out the mold to obtain the composite skateboard containing ultra-high molecular weight polyethylene.

[0059] Among them, the preparation method of the trimethylolpropane-modified polytetrafluoroethylene includes the following steps: S1: Disperse 50 g of polytetrafluoroethylene in 400 mL of a mixed solvent of ethyl acetate and ethanol with a volume ratio of 1:3, add 3.5 g of silane coupling agent, mix evenly, and perform microwave irradiation for 1.5 min under the condition of a power of 1500 W to obtain a pretreated polytetrafluoroethylene suspension. S2: Add 10 g of trimethylolpropane to the polytetrafluoroethylene suspension, stir and react at 75 °C for 7 h under an inert atmosphere, filter, and dry to obtain trimethylolpropane-modified polytetrafluoroethylene.

[0060] The preparation method of the molybdenum disulfide-coated carbon fiber includes the following steps: Step a: Mix 6 g of ammonium molybdate and 6.2 g of sodium sulfide evenly, dissolve them in 500 mL of deionized water to obtain an inorganic mixed solution. Step b: Immerse 20 g of short-cut carbon fibers with a length of 1 mm in a mixed solution of 150 mL of a hydrofluoric acid solution and a hydrochloric acid solution with a volume ratio of 1:10 for 25 min, perform ultrasonic treatment for 15 min, and perform solid-liquid separation to obtain activated carbon fibers. Among them, the concentration of the hydrofluoric acid solution is 0.5 mol / L; the concentration of the hydrochloric acid solution is 0.8 mol / L. Step c: Disperse the activated carbon fibers in 100 mL of the inorganic mixed solution, perform hydrothermal reaction at 200 °C for 18 h, perform solid-liquid separation, and dry to obtain the molybdenum disulfide-coated carbon fiber.

[0061] Comparative Example 1 This comparative example provides a composite skateboard containing ultra-high molecular weight polyethylene and its preparation method. The difference from Example 1 is that the polytetrafluoroethylene is not modified, and other components and contents remain unchanged. The specific content is as follows: The composite slide plate containing ultra-high molecular weight polyethylene comprises a working layer material and a base layer material from top to bottom; Among them, the working layer material comprises raw material components in the following mass parts: 100 parts of ultra-high molecular weight polyethylene with a molecular weight of 9 million, 40 parts of polytetrafluoroethylene, 3 parts of dimethyl silicone oil, 4 parts of inorganic filler, 2 parts of maleic anhydride grafted polypropylene, and 2 parts of titanate coupling agent; among them, the inorganic filler is activated carbon and calcium sulfate with a mass ratio of 1:6.

[0062] The base layer material comprises raw material components in the following mass parts: 100 parts of ultra-high molecular weight polyethylene with a molecular weight of 9 million, 6 parts of molybdenum disulfide coated carbon fiber, 4 parts of graphene, and 3 parts of titanate coupling agent.

[0063] The preparation method of the composite slide plate comprises the following steps: Step 1: Weigh the raw material components of the slide plate according to the designed ratio, dissolve the titanate coupling agent in water according to a mass ratio of 1:3, add the inorganic filler to obtain a first mixture; sequentially add ultra-high molecular weight polyethylene, dimethyl silicone oil, polytetrafluoroethylene, and maleic anhydride grafted polypropylene to the first mixture, and mix evenly to obtain the working layer material; Step 2: Weigh the raw material components of the substrate according to the designed ratio, dissolve the titanate coupling agent in water according to a mass ratio of 1:3, add graphene to obtain a second mixture; sequentially add ultra-high molecular weight polyethylene and molybdenum disulfide coated carbon fiber to the second mixture, and mix evenly to obtain the base layer material; Step 3: Lay the base layer material and the working layer material flat and in sequence from bottom to top, and perform molding by die pressing at 250 °C and 14 MPa, cool down and take out of the mold to obtain the composite slide plate containing ultra-high molecular weight polyethylene.

[0064] The preparation method of the molybdenum disulfide coated carbon fiber comprises the following steps: Step a: Mix 5 g of ammonium molybdate and 5 g of sodium sulfide evenly, dissolve them in 500 mL of deionized water to obtain an inorganic mixed solution; Step b: Immerse 20 g of short cut carbon fiber with a length of 0.8 mm in a mixed solution of 150 mL of hydrofluoric acid solution and hydrochloric acid solution with a volume ratio of 1:10 for 25 min, perform ultrasonic treatment for 15 min, and perform solid-liquid separation to obtain activated carbon fiber; among them, the concentration of the hydrofluoric acid solution is 0.5 mol / L; the concentration of the hydrochloric acid solution is 0.8 mol / L; Step c: Disperse the activated carbon fiber in 100 mL of the inorganic mixed solution, perform hydrothermal reaction at 180 °C for 18 h, perform solid-liquid separation, and dry to obtain the molybdenum disulfide coated carbon fiber.

[0065] Comparative Example 2 This comparative example provides a composite slide plate containing ultra-high molecular weight polyethylene and its preparation method. The difference from Example 1 is that the carbon fiber is not coated, and other components and their contents remain unchanged. The specific content is as follows: The composite slide plate containing ultra-high molecular weight polyethylene includes a working layer material and a base layer material from top to bottom; Among them, the working layer material includes the following raw material components in parts by mass: 100 parts of ultra-high molecular weight polyethylene with a molecular weight of 9 million, 40 parts of trimethylolpropane-modified polytetrafluoroethylene, 3 parts of silicone oil, 4 parts of inorganic filler, 2 parts of maleic anhydride-grafted polypropylene, and 2 parts of titanate coupling agent; among them, the inorganic filler is activated carbon and calcium sulfate with a mass ratio of 1:6.

[0066] The base layer material includes the following raw material components in parts by mass: 100 parts of ultra-high molecular weight polyethylene with a molecular weight of 9 million, 6 parts of carbon fiber, 4 parts of graphene, and 3 parts of titanate coupling agent.

[0067] The preparation method of the composite slide plate includes the following steps: Step 1: Weigh the raw material components of the slide plate according to the designed ratio. Dissolve the titanate coupling agent in water according to a mass ratio of 1:3, add the inorganic filler to obtain a first mixture; sequentially add ultra-high molecular weight polyethylene, dimethyl silicone oil, trimethylolpropane-modified polytetrafluoroethylene, and maleic anhydride-grafted polypropylene to the first mixture and mix evenly to obtain the working layer material; Step 2: Weigh the raw material components of the substrate according to the designed ratio. Dissolve the titanate coupling agent in water according to a mass ratio of 1:3, add graphene to obtain a second mixture; sequentially add ultra-high molecular weight polyethylene and carbon fiber to the second mixture and mix evenly to obtain the base layer material; Step 3: Lay the base layer material and the working layer material flat and cloth in order from bottom to top, and carry out molding by die pressing at 250 °C and 14 MPa, cool down and take out of the mold to obtain a composite slide plate containing ultra-high molecular weight polyethylene.

[0068] Among them, the preparation method of the trimethylolpropane-modified polytetrafluoroethylene includes the following steps: S1: Disperse 50 g of polytetrafluoroethylene in 400 mL of a mixed solvent of ethyl acetate and ethanol with a volume ratio of 1:3, add 3.5 g of silane coupling agent, mix evenly, and carry out microwave irradiation for 1.5 min under the condition of a power of 1200 W to obtain a pretreated polytetrafluoroethylene suspension; S2: Add 10 g of trimethylolpropane to the polytetrafluoroethylene suspension, and stir and react at 75 °C for 7 h in an inert atmosphere, filter and dry to obtain trimethylolpropane-modified polytetrafluoroethylene.

[0069] To further confirm the technical effects of the present invention, the composite skateboards containing ultra-high molecular weight polyethylene obtained in Examples 1-3 and Comparative Examples 1-2 were subjected to the following performance tests: Refer to JT / T 901-2023 to test the tensile strength, elongation at break, ball indentation hardness ( H ), static friction coefficient, and load compression deformation. Among them, the tensile rate was 50 mm / min, the relative sliding speed for testing the static friction coefficient was 0.4 mm / s, the test temperature was 23 ± 2 °C, and the test results are shown in Table 1.

[0070] Table 1 Performance test results of the composite skateboards obtained in each example and comparative example

[0071] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, or improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A composite skateboard containing ultra-high molecular weight polyethylene, characterized in that: The composite slide plate containing ultra-high molecular weight polyethylene comprises a working layer material and a base layer material from top to bottom; The working layer material comprises the following raw material components in parts by weight: 80-120 parts of ultra-high molecular weight polyethylene, 20-50 parts of trimethylolpropane-modified polytetrafluoroethylene, 1-5 parts of lubricant, 1-5 parts of inorganic filler, 1-3 parts of compatibilizer and 1-3 parts of coupling agent; The base layer material comprises the following raw material components in parts by mass: 80-120 parts of ultra-high molecular weight polyethylene, 5-10 parts of molybdenum disulfide coated carbon fiber, 1-5 parts of graphene and 1-3 parts of coupling agent.

2. The composite skateboard containing ultra-high molecular weight polyethylene according to claim 1, characterized in that: The preparation method of trimethylolpropane-modified polytetrafluoroethylene comprises the following steps: S1. Dispersing polytetrafluoroethylene in an organic solvent, adding a silane coupling agent, mixing evenly, and irradiating with microwaves for 1-2 minutes to obtain a polytetrafluoroethylene suspension; S2. Add trimethylolpropane to the polytetrafluoroethylene suspension, stir and react at 70-80° C. under an inert atmosphere, filter, and dry to obtain trimethylolpropane-modified polytetrafluoroethylene.

3. The composite skateboard containing ultra-high molecular weight polyethylene according to claim 2, characterized in that: In S1, the organic solvent is a mixed solvent of ethyl acetate and ethanol in a volume ratio of 1:2-1:5; and / or In S1, the mass volume ratio of the polytetrafluoroethylene to the organic solvent is 1g:5mL-1g:10mL; and / or In S1, the amount of the silane coupling agent added is 5%-8% of the mass of the polytetrafluoroethylene; and / or In S1, the power of the microwave irradiation is 1000-1500W.

4. The composite skateboard containing ultra-high molecular weight polyethylene according to claim 2, characterized in that: In S2, the mass ratio of the trimethylolpropane to the polytetrafluoroethylene is 1:3-1:5; and / or In S2, the stirring reaction time is 6-8h.

5. The composite skateboard containing ultra-high molecular weight polyethylene according to claim 1, characterized in that: The preparation method of the molybdenum disulfide coated carbon fiber comprises the following steps: Step a, dissolving a molybdenum source and a sulfur source in deionized water respectively, and mixing them evenly to obtain an inorganic mixed solution; Step b, immersing the chopped carbon fibers in an acid solution for activation, and performing solid-liquid separation to obtain activated carbon fibers; Step c, dispersing the activated carbon fiber in the inorganic mixed solution, performing a hydrothermal reaction at 160-200° C., solid-liquid separation, and drying to obtain the molybdenum disulfide coated carbon fiber.

6. The composite skateboard containing ultra-high molecular weight polyethylene according to claim 5, characterized in that: In step a, the molybdenum source is any one of ammonium molybdate, sodium molybdate or molybdenum chloride; and / or In step a, the sulfur source is any one of thiourea, thioacetamide, ammonium sulfide or sodium sulfide; and / or In step a, the molar ratio of molybdenum in the molybdenum source to sulfur in the sulfur source is 1:2-1:3; and / or In step a, the mass ratio of the molybdenum source to the deionized water is 1:80-1:

100.

7. The composite skateboard containing ultra-high molecular weight polyethylene according to claim 5, characterized in that: In step b, the mass volume ratio of the chopped carbon fiber to the acid solution is 1g:5mL-1g:8mL; and / or In step b, the acid solution is a hydrofluoric acid solution and a hydrochloric acid solution in a volume ratio of 1:10-1:15; and / or In step b, activation is performed by ultrasonic treatment; and / or In step c, the mass ratio of the activated carbon fiber to the molybdenum source in the inorganic mixed solution is 5:1-5:2; and / or In step c, the hydrothermal reaction time is 16-20 hours.

8. The composite skateboard containing ultra-high molecular weight polyethylene according to claim 1, characterized in that: The inorganic filler is activated carbon and calcium sulfate in a mass ratio of 1:5-1:10; and / or The lubricant is methyl silicone oil; and / or The compatibilizer is maleic anhydride grafted polypropylene; and / or The coupling agent is a titanate coupling agent.

9. A method for preparing a composite skateboard containing ultra-high molecular weight polyethylene according to any one of claims 1 to 8, characterized in that: The steps include: Step 1: weigh the raw materials of each component of the skateboard according to the designed ratio, dissolve the coupling agent in water, add the inorganic filler, and obtain the first mixture; add ultra-high molecular weight polyethylene, lubricant, trimethylolpropane-modified polytetrafluoroethylene and compatibilizer to the first mixture in sequence, mix well, and obtain the working layer material; Step 2: weigh the raw materials of each component of the substrate according to the designed ratio, dissolve the coupling agent in water, add graphene, and obtain a second mixture; add ultra-high molecular weight polyethylene and molybdenum disulfide-coated carbon fiber to the second mixture in sequence, mix well, and obtain a base layer material; Step 3: Lay the base layer material and the working layer material flat in order from bottom to top, perform compression molding at 240-270° C., cool down and demould, and obtain a composite skateboard containing ultra-high molecular weight polyethylene.

10. Use of a composite skateboard containing ultra-high molecular weight polyethylene as described in any one of claims 1 to 8 or a composite skateboard containing ultra-high molecular weight polyethylene prepared by the preparation method of a composite skateboard containing ultra-high molecular weight polyethylene as described in claim 9 in preparing bridge seismic isolation bearings.

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