A composite skateboard containing ultra-high molecular weight polyethylene and its preparation method and application

Abstract

The present invention relates to the technical field of sliding materials for shock-absorbing and isolating bearings, and specifically discloses a composite slide plate containing ultra-high molecular weight polyethylene, and a preparation method and application thereof. The composite slide plate containing ultra-high molecular weight polyethylene includes a working layer material and a base layer material from top to bottom; the raw material components of the working layer material include ultra-high molecular weight polyethylene, trimethylolpropane-modified polytetrafluoroethylene, a lubricant, an inorganic filler, a compatibilizer, and a coupling agent; the raw material components of the base layer material include ultra-high molecular weight polyethylene, molybdenum disulfide-coated carbon fiber, graphene, and a coupling agent. The composite slide plate prepared by the present invention has high compressive strength, excellent wear resistance, and excellent creep resistance. The technical solution of the present invention effectively solves the problems of low compressive strength, poor wear resistance, and poor creep resistance of sliding materials for shock-absorbing and isolating bearings in the prior art.

Description

Technical Field

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

[0002] The reason why bridge slabs fall from the pier beams is that when strong winds blow through the bridge or the bridge is subjected to excessive vibration pressure from the outside, large horizontal and vertical forces are generated, causing the prefabricated bridge slabs to move horizontally and up and down. When the displacement exceeds the width of the prefabricated bridge slabs on the piers, the bridge slabs will fall. At this time, not only will the bridge be damaged, but pedestrians and vehicles on and under the bridge will also face major safety hazards.

[0003] To address this safety hazard, engineers developed bridge seismic bearings. These bearings possess sufficient vertical stiffness to withstand vertical loads and reliably transmit superstructure pressure to the piers. Furthermore, they possess excellent elasticity to accommodate beam end rotation and possess significant shear deformation to accommodate superstructure horizontal displacement. However, as the demand for bridge bearings continues to grow, bridge construction faces increasing environmental and technical challenges and increasingly demanding design requirements. Consequently, conventional bridge bearings, typically made of sliding plates, are increasingly unable to meet the design requirements of these new bearings.

[0004] The existing technology mainly uses polytetrafluoroethylene (PTFE) slides, which have good self-lubrication and low friction coefficient, but their compressive performance is poor and cannot meet the design requirements of seismic isolation bearings. There are also reports on composite slides modified with 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 slides have high compressive strength and excellent wear resistance under silicone grease conditions, but in the absence of silicone grease lubrication, their thermal conductivity is poor, and the heat generated during friction cannot be effectively dissipated, which may cause deformation of the slide 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 excellent anti-creep performance even under conditions without silicone grease lubrication. Summary of the Invention

[0006] In response to the problems in the prior art that sliding materials used in seismic isolation bearings 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 comprises a working layer and a base layer from top to bottom, wherein 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, and effectively makes up for the shortcomings of existing sliding materials used in bridge bearings.

[0007] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0008] A first aspect of the present invention provides a composite skateboard containing ultra-high molecular weight polyethylene, wherein the composite skateboard containing ultra-high molecular weight polyethylene comprises, from top to bottom, a working layer material and a base layer material;

[0009] 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;

[0010] 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 fibers, 1-5 parts of graphene, and 1-3 parts of a coupling agent.

[0011] Compared to the prior art, the present invention provides a composite skateboard composed of a working layer material and a base layer material. The working layer material is prepared primarily from ultra-high molecular weight polyethylene (UHMWPE) and trimethylolpropane-modified polytetrafluoroethylene (PTFE), supplemented with lubricants, inorganic fillers, compatibilizers, and coupling agents; the base layer material is prepared primarily from UHMWPE and molybdenum disulfide-coated carbon fiber, supplemented with graphene and a coupling agent. The present invention incorporates UHMWPE into both the working and base layer materials. The UHMWPE exhibits excellent self-lubricating properties, effectively reducing friction, lowering energy loss, and extending the service life of bridge construction. Furthermore, UHMWPE exhibits excellent tolerance to many chemical substances and is not susceptible to chemical corrosion. This allows bridge bearings to function properly even in harsh natural environments, improving the safety and reliability of the bridge. More importantly, UHMWPE exhibits high impact strength, enabling it to withstand significant impact forces and protect the overall stability of the bridge. The present invention also incorporates trimethylolpropane-modified polytetrafluoroethylene (PTFE) into the working layer material. Conventional PTFE has poor creep resistance and a low friction coefficient. Modification with trimethylolpropane effectively compensates for these shortcomings and improves the wear resistance of PTFE. Furthermore, the TMP-modified PTFE exhibits a high load-bearing capacity and high wear resistance, capable of withstanding the weight and impact of bridge bearings during use, thereby enhancing bridge safety.

[0012] The present invention also adds molybdenum disulfide coated carbon fiber as the main raw material to the base layer material. The carbon fiber itself has excellent mechanical properties and chemical stability as well as light weight and high strength characteristics, 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 friction resistance of the bridge bearing during use, reduce the wear between components, and thus improve the service life and operating efficiency of the bridge bearing. In addition, the lubricating effect of molybdenum disulfide can make the stress distribution between the carbon fibers more uniform, avoid local stress concentration, and thus improve the overall strength and toughness of the bridge seismic isolation bearing. The composite slide has high compressive strength, excellent wear resistance and creep resistance. The technical solution of the present invention effectively solves the problems of low compressive strength, poor wear resistance and poor creep resistance of the sliding material used for seismic isolation bearings in the prior art.

[0013] Preferably, the preparation method of trimethylolpropane-modified polytetrafluoroethylene comprises the following steps:

[0014] S1. Dispersing polytetrafluoroethylene in an organic solvent, adding a silane coupling agent, mixing well, and irradiating with microwaves for 1-2 minutes to obtain a polytetrafluoroethylene suspension;

[0015] 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.

[0016] Further preferably, in S1, the organic solvent is a mixed solvent of ethyl acetate and ethanol in a volume ratio of 1:2-1:5.

[0017] Further preferably, in S1, the mass volume ratio of the polytetrafluoroethylene to the organic solvent is 1 g:5 mL-1 g:10 mL.

[0018] Further preferably, in S1, the amount of the silane coupling agent added is 5%-8% of the mass of the polytetrafluoroethylene.

[0019] Further preferably, in S1, the power of the microwave irradiation is 1000-1500W.

[0020] Further preferably, in S2, the mass ratio of the trimethylolpropane to the polytetrafluoroethylene is 1:3-1:5.

[0021] Further preferably, in S2, the stirring reaction time is 6-8 hours.

[0022] Preferably, the method for preparing the molybdenum disulfide coated carbon fiber comprises the following steps:

[0023] Step a, dissolving a molybdenum source and a sulfur source in deionized water respectively, and mixing them uniformly to obtain an inorganic mixed solution;

[0024] Step b, immersing the chopped carbon fibers in an acid solution for activation, and performing solid-liquid separation to obtain activated carbon fibers;

[0025] Step c: dispersing the activated carbon fiber in the inorganic mixed solution, performing a hydrothermal reaction at 160-200° C., performing solid-liquid separation, and drying to obtain the molybdenum disulfide-coated carbon fiber.

[0026] Further preferably, in step a, the molybdenum source is any one of ammonium molybdate, sodium molybdate or molybdenum chloride.

[0027] Further preferably, in step a, the sulfur source is any one of thiourea, thioacetamide, ammonium sulfide or sodium sulfide.

[0028] Further preferably, in step a, the molar ratio of the molybdenum in the molybdenum source to the sulfur in the sulfur source is 1:2-1:3.

[0029] Further preferably, in step a, the mass ratio of the molybdenum source to the deionized water is 1:80-1:100.

[0030] Further preferably, in step b, the mass volume ratio of the chopped carbon fibers to the acid solution is 1 g:5 mL to 1 g:8 mL.

[0031] Further preferably, 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.

[0032] Further preferably, in step b, the length of the chopped carbon fibers is 0.5-1 mm.

[0033] More preferably, the concentration of the hydrofluoric acid solution is 0.5-1 mol / L.

[0034] More preferably, the concentration of the hydrochloric acid solution is 0.5-1 mol / L.

[0035] More preferably, in step b, activation is performed by ultrasonic treatment.

[0036] More preferably, in step b, the frequency of the ultrasonic treatment is 30-35 kW.

[0037] More preferably, in step b, the ultrasonic treatment time is 20-30 min.

[0038] Further 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.

[0039] Further preferably, in step c, the hydrothermal reaction time is 16-20 h.

[0040] Preferably, the molecular weight of the ultra-high molecular weight polyethylene is 8 million to 10 million.

[0041] Further preferably, the molecular weight of the ultra-high molecular weight polyethylene is 9 million.

[0042] Preferably, the inorganic filler is activated carbon and calcium sulfate in a mass ratio of 1:5-1:10.

[0043] More preferably, the specific surface area of ​​the activated carbon is 500-2000m 2 / g.

[0044] Preferably, the lubricant is methyl silicone oil.

[0045] More preferably, the lubricant is dimethyl silicone oil or benzyl silicone oil.

[0046] Preferably, the compatibilizer is maleic anhydride grafted polypropylene.

[0047] Preferably, the coupling agent is a titanate coupling agent.

[0048] A second aspect of the present invention provides a method for preparing the composite skateboard containing ultra-high molecular weight polyethylene, comprising the following steps:

[0049] Step 1: Weigh the raw materials of the skateboard components according to the designed ratio, dissolve the coupling agent in water, and add the inorganic filler to obtain a first mixture; add ultra-high molecular weight polyethylene, lubricant, trimethylolpropane-modified polytetrafluoroethylene and compatibilizer to the first mixture in sequence, mix well, and obtain a working layer material;

[0050] Step 2: Weigh the raw materials of each component of the substrate according to the designed ratio, dissolve the coupling agent in water, and add graphene to 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;

[0051] 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 remove from the mold to obtain a composite skateboard containing ultra-high molecular weight polyethylene.

[0052] Preferably, in step 1 and step 2, the mass ratio of the coupling agent to water is 1:3-1:5.

[0053] Preferably, in step three, the compression molding pressure is 10-15 MPa.

[0054] The second aspect of the present invention provides an application of the composite skateboard containing ultra-high molecular weight polyethylene or the composite skateboard containing ultra-high molecular weight polyethylene prepared by the preparation method of the composite skateboard containing ultra-high molecular weight polyethylene in the preparation of bridge seismic isolation bearings.

[0055] In summary, the present invention designs a composite slide plate containing ultra-high molecular weight polyethylene, comprising 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 creep resistance. The technical solution of the present invention effectively solves the problems of low compressive strength, poor wear resistance, and poor creep resistance in the prior art sliding materials used in seismic isolation bearings, providing a new design concept for sliding materials used in bridge seismic isolation bearings. DETAILED DESCRIPTION

[0056] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0057] Example 1

[0058] This embodiment provides a composite skateboard containing ultra-high molecular weight polyethylene and a preparation method thereof, which specifically includes the following contents:

[0059] The composite slide plate containing ultra-high molecular weight polyethylene comprises a working layer material and a base layer material from top to bottom;

[0060] 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 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 in a mass ratio of 1:6.

[0061] 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 molybdenum disulfide-coated carbon fibers, 4 parts of graphene, and 3 parts of a titanate coupling agent.

[0062] The preparation method of the composite skateboard comprises the following steps:

[0063] Step 1: Weigh the raw materials of the skateboard components according to the designed ratio, dissolve the titanate coupling agent in water at a mass ratio of 1:3, and add an inorganic filler to obtain a first mixture; add ultra-high molecular weight polyethylene, dimethyl silicone oil, trimethylolpropane-modified polytetrafluoroethylene, and maleic anhydride-grafted polypropylene to the first mixture in sequence, and mix well to obtain a working layer material;

[0064] Step 2: Weigh the raw materials of each component of the substrate according to the designed ratio, dissolve the titanate coupling agent in water at a mass ratio of 1:3, and add graphene to 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;

[0065] Step 3: Lay the base layer material and the working layer material flat in order from bottom to top, press-form them at 250°C and 14 MPa, cool them down and demold them to obtain a composite skateboard containing ultra-high molecular weight polyethylene.

[0066] The preparation method of trimethylolpropane-modified polytetrafluoroethylene comprises the following steps:

[0067] S1, 50g of polytetrafluoroethylene was dispersed in 400mL of a mixed solvent of ethyl acetate and ethanol in a volume ratio of 1:3, 3.5g of a silane coupling agent was added, the mixture was mixed evenly, and microwave irradiation was performed at a power of 1200W for 1.5min to obtain a pretreated polytetrafluoroethylene suspension;

[0068] S2. Add 10 g of trimethylolpropane to the polytetrafluoroethylene suspension, stir and react at 75° C. under an inert atmosphere for 7 h, filter, and dry to obtain trimethylolpropane-modified polytetrafluoroethylene.

[0069] The preparation method of the molybdenum disulfide coated carbon fiber comprises the following steps:

[0070] Step a: Evenly mix 5 g of ammonium molybdate and 5 g of sodium sulfide, and dissolve the mixture in 500 mL of deionized water to obtain an inorganic mixed solution;

[0071] Step b, immersing 20 g of chopped carbon fibers with a length of 0.8 mm in 150 mL of a mixed solution of a hydrofluoric acid solution and a hydrochloric acid solution in a volume ratio of 1:10 for 25 min, ultrasonically treating for 15 min, and performing 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;

[0072] Step c, dispersing the activated carbon fiber in 100 mL of the inorganic mixed solution, performing a hydrothermal reaction at 180° C. for 18 hours, separating the solid and the liquid, and drying to obtain the molybdenum disulfide-coated carbon fiber.

[0073] Example 2

[0074] This embodiment provides a composite skateboard containing ultra-high molecular weight polyethylene and a preparation method thereof, which specifically includes the following contents:

[0075] The composite slide plate containing ultra-high molecular weight polyethylene comprises a working layer material and a base layer material from top to bottom;

[0076] 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 in a mass ratio of 1:5.

[0077] 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 fiber, 4 parts of graphene and 3 parts of titanate coupling agent.

[0078] The preparation method of the composite skateboard comprises the following steps:

[0079] Step 1: Weigh the raw materials of the skateboard components according to the designed ratio, dissolve the titanate coupling agent in water at a mass ratio of 1:3, and add an inorganic filler to obtain a first mixture; add ultra-high molecular weight polyethylene, dimethyl silicone oil, trimethylolpropane-modified polytetrafluoroethylene, and maleic anhydride-grafted polypropylene to the first mixture in sequence, and mix well to obtain a working layer material;

[0080] Step 2: Weigh the raw materials of each component of the substrate according to the designed ratio, dissolve the titanate coupling agent in water at a mass ratio of 1:3, and add graphene to 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;

[0081] Step 3: Lay the base layer material and the working layer material flat in order from bottom to top, press-form them at 260°C and 13 MPa, cool them down and demold them to obtain a composite skateboard containing ultra-high molecular weight polyethylene.

[0082] The preparation method of trimethylolpropane-modified polytetrafluoroethylene comprises the following steps:

[0083] S1. Disperse 50 g of polytetrafluoroethylene in 400 mL of a mixed solvent of ethyl acetate and ethanol in a volume ratio of 1:3, add 3.5 g of a silane coupling agent, mix well, and irradiate with microwaves at a power of 1000 W for 1.5 min to obtain a pretreated polytetrafluoroethylene suspension;

[0084] S2. Add 10 g of trimethylolpropane to the polytetrafluoroethylene suspension, stir and react at 75° C. under an inert atmosphere for 7 h, filter, and dry to obtain trimethylolpropane-modified polytetrafluoroethylene.

[0085] The preparation method of the molybdenum disulfide coated carbon fiber comprises the following steps:

[0086] Step a: 5.3 g of ammonium molybdate and 5.8 g of sodium sulfide were mixed uniformly and dissolved in 500 mL of deionized water to obtain an inorganic mixed solution;

[0087] Step b, immersing 20 g of 0.5 mm long chopped carbon fibers in 150 mL of a mixed solution of hydrofluoric acid solution and hydrochloric acid solution in a volume ratio of 1:10 for 25 min, ultrasonically treating for 15 min, and performing 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;

[0088] Step c: dispersing the activated carbon fiber in 100 mL of the inorganic mixed solution, performing a hydrothermal reaction at 160° C. for 18 hours, separating the solid and the liquid, and drying to obtain the molybdenum disulfide-coated carbon fiber.

[0089] Example 3

[0090] This embodiment provides a composite skateboard containing ultra-high molecular weight polyethylene and a preparation method thereof, which specifically includes the following contents:

[0091] The composite slide plate containing ultra-high molecular weight polyethylene comprises a working layer material and a base layer material from top to bottom;

[0092] The working layer material includes 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 phenylmethyl 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 in a mass ratio of 1:8.

[0093] The base layer material includes 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.

[0094] The preparation method of the composite skateboard comprises the following steps:

[0095] Step 1: Weigh the raw materials of the skateboard components according to the designed ratio, dissolve the titanate coupling agent in water at a mass ratio of 1:3, and add an inorganic filler to obtain a first mixture; add ultra-high molecular weight polyethylene, phenylmethyl silicone oil, trimethylolpropane-modified polytetrafluoroethylene, and maleic anhydride-grafted polypropylene to the first mixture in sequence, and mix well to obtain a working layer material;

[0096] Step 2: Weigh the raw materials of each component of the substrate according to the designed ratio, dissolve the titanate coupling agent in water at a mass ratio of 1:3, and add graphene to 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;

[0097] Step 3: Lay the base layer material and the working layer material flat in order from bottom to top, press-form them at 240°C and 15 MPa, cool them down and remove them from the mold to obtain a composite skateboard containing ultra-high molecular weight polyethylene.

[0098] The preparation method of trimethylolpropane-modified polytetrafluoroethylene comprises the following steps:

[0099] S1, 50g of polytetrafluoroethylene was dispersed in 400mL of a mixed solvent of ethyl acetate and ethanol in a volume ratio of 1:3, 3.5g of a silane coupling agent was added, the mixture was mixed evenly, and microwave irradiation was performed at a power of 1500W for 1.5min to obtain a pretreated polytetrafluoroethylene suspension;

[0100] S2. Add 10 g of trimethylolpropane to the polytetrafluoroethylene suspension, stir and react at 75° C. under an inert atmosphere for 7 h, filter, and dry to obtain trimethylolpropane-modified polytetrafluoroethylene.

[0101] The preparation method of the molybdenum disulfide coated carbon fiber comprises the following steps:

[0102] Step a: 6 g of ammonium molybdate and 6.2 g of sodium sulfide were mixed and dissolved in 500 mL of deionized water to obtain an inorganic mixed solution;

[0103] Step b, immersing 20 g of 1 mm long chopped carbon fibers in 150 mL of a mixed solution of a hydrofluoric acid solution and a hydrochloric acid solution in a volume ratio of 1:10 for 25 min, ultrasonically treating for 15 min, and performing 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;

[0104] Step c: dispersing the activated carbon fiber in 100 mL of the inorganic mixed solution, performing a hydrothermal reaction at 200° C. for 18 hours, separating the solid and the liquid, and drying to obtain the molybdenum disulfide-coated carbon fiber.

[0105] Comparative Example 1

[0106] This comparative example provides a composite skateboard containing ultra-high molecular weight polyethylene and a preparation method thereof. The difference from Example 1 is that the polytetrafluoroethylene is not modified, and the other components and contents remain unchanged. Specifically, the following contents are included:

[0107] The composite slide plate containing ultra-high molecular weight polyethylene comprises a working layer material and a base layer material from top to bottom;

[0108] 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 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 in a mass ratio of 1:6.

[0109] 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 molybdenum disulfide-coated carbon fibers, 4 parts of graphene, and 3 parts of a titanate coupling agent.

[0110] The preparation method of the composite skateboard comprises the following steps:

[0111] Step 1: Weigh the raw materials of the skateboard components according to the designed ratio, dissolve the titanate coupling agent in water at a mass ratio of 1:3, and add an inorganic filler to obtain a first mixture; add ultra-high molecular weight polyethylene, dimethyl silicone oil, polytetrafluoroethylene, and maleic anhydride grafted polypropylene to the first mixture in sequence, and mix well to obtain a working layer material;

[0112] Step 2: Weigh the raw materials of each component of the substrate according to the designed ratio, dissolve the titanate coupling agent in water at a mass ratio of 1:3, and add graphene to 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;

[0113] Step 3: Lay the base layer material and the working layer material flat in order from bottom to top, press-form them at 250°C and 14 MPa, cool them down and demold them to obtain a composite skateboard containing ultra-high molecular weight polyethylene.

[0114] The preparation method of the molybdenum disulfide coated carbon fiber comprises the following steps:

[0115] Step a: Evenly mix 5 g of ammonium molybdate and 5 g of sodium sulfide, and dissolve the mixture in 500 mL of deionized water to obtain an inorganic mixed solution;

[0116] Step b, immersing 20 g of chopped carbon fibers with a length of 0.8 mm in 150 mL of a mixed solution of a hydrofluoric acid solution and a hydrochloric acid solution in a volume ratio of 1:10 for 25 min, ultrasonically treating for 15 min, and performing 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;

[0117] Step c, dispersing the activated carbon fiber in 100 mL of the inorganic mixed solution, performing a hydrothermal reaction at 180° C. for 18 hours, separating the solid and the liquid, and drying to obtain the molybdenum disulfide-coated carbon fiber.

[0118] Comparative Example 2

[0119] This comparative example provides a composite skateboard containing ultra-high molecular weight polyethylene and a preparation method thereof. The difference from Example 1 is that the carbon fiber is not coated, and the other components and contents remain unchanged. Specifically, the following contents are included:

[0120] The composite slide plate containing ultra-high molecular weight polyethylene comprises a working layer material and a base layer material from top to bottom;

[0121] 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; wherein the inorganic filler is activated carbon and calcium sulfate in a mass ratio of 1:6.

[0122] 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.

[0123] The preparation method of the composite skateboard comprises the following steps:

[0124] Step 1: Weigh the raw materials of the skateboard components according to the designed ratio, dissolve the titanate coupling agent in water at a mass ratio of 1:3, and add an inorganic filler to obtain a first mixture; add ultra-high molecular weight polyethylene, dimethyl silicone oil, trimethylolpropane-modified polytetrafluoroethylene, and maleic anhydride-grafted polypropylene to the first mixture in sequence, and mix well to obtain a working layer material;

[0125] Step 2: Weigh the raw materials of each component of the substrate according to the designed ratio, dissolve the titanate coupling agent in water at a mass ratio of 1:3, and add graphene to obtain a second mixture; add ultra-high molecular weight polyethylene and carbon fiber to the second mixture in sequence, and mix well to obtain a base layer material;

[0126] Step 3: Lay the base layer material and the working layer material flat in order from bottom to top, press-form them at 250°C and 14 MPa, cool them down and demold them to obtain a composite skateboard containing ultra-high molecular weight polyethylene.

[0127] The preparation method of trimethylolpropane-modified polytetrafluoroethylene comprises the following steps:

[0128] S1, 50g of polytetrafluoroethylene was dispersed in 400mL of a mixed solvent of ethyl acetate and ethanol in a volume ratio of 1:3, 3.5g of a silane coupling agent was added, the mixture was mixed evenly, and microwave irradiation was performed at a power of 1200W for 1.5min to obtain a pretreated polytetrafluoroethylene suspension;

[0129] S2. Add 10 g of trimethylolpropane to the polytetrafluoroethylene suspension, stir and react at 75° C. under an inert atmosphere for 7 h, filter, and dry to obtain trimethylolpropane-modified polytetrafluoroethylene.

[0130] In order to further verify the technical effect of the present invention, the present invention conducted the following performance tests on the composite skateboard containing ultra-high molecular weight polyethylene obtained in Examples 1-3 and Comparative Examples 1-2: referring to JT / T901-2023, the tensile strength, elongation at break, ball indentation hardness ( H ), static friction coefficient and load compression deformation, where the stretching rate is 50 mm / min, the relative sliding speed of the static friction coefficient test is 0.4 mm / s, and the test temperature is 23±2°C. The test results are shown in Table 1.

[0131] Table 1 Performance test results of the composite skateboards obtained in various embodiments and comparative examples

[0132]

[0133] 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 in the scope of protection 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 weight: 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; The preparation method of trimethylolpropane-modified polytetrafluoroethylene comprises the following steps: S1. Dispersing polytetrafluoroethylene in an organic solvent, adding a silane coupling agent, mixing well, and irradiating with microwaves for 1-2 minutes to obtain a polytetrafluoroethylene suspension; S2, adding trimethylolpropane to the polytetrafluoroethylene suspension, stirring and reacting at 70-80° C. under an inert atmosphere, filtering, and drying to obtain trimethylolpropane-modified polytetrafluoroethylene; 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 uniformly 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., performing solid-liquid separation, and drying to obtain the molybdenum disulfide-coated carbon fiber.

2. The composite skateboard containing ultra-high molecular weight polyethylene according to claim 1, 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.

3. The composite skateboard containing ultra-high molecular weight polyethylene according to claim 1, 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 6-8 hours.

4. The composite skateboard containing ultra-high molecular weight polyethylene according to claim 1, wherein: 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.

5. The composite skateboard containing ultra-high molecular weight polyethylene according to claim 1, 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.

6. 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.

7. A method for preparing a composite skateboard containing ultra-high molecular weight polyethylene according to any one of claims 1 to 6, characterized in that: The steps include: Step 1: Weigh the raw materials of the skateboard components according to the designed ratio, dissolve the coupling agent in water, and add the inorganic filler to obtain a first mixture; add ultra-high molecular weight polyethylene, lubricant, trimethylolpropane-modified polytetrafluoroethylene and compatibilizer to the first mixture in sequence, mix well, and obtain a 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, and add graphene to 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 remove from the mold to obtain a composite skateboard containing ultra-high molecular weight polyethylene.

8. Use of a composite skateboard containing ultra-high molecular weight polyethylene as described in any one of claims 1 to 6 or a composite skateboard containing ultra-high molecular weight polyethylene prepared by the method for preparing a composite skateboard containing ultra-high molecular weight polyethylene as described in claim 7 in the preparation of bridge seismic isolation bearings.

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