▎ 摘　　要

NOVELTY - Preparing a graphene block involves arranging the fiber array vertically on the substrate, coating graphene oxide slurry between fiber arrays on the substrate, and drying after coating the graphene oxide slurry. The coating and drying are repeated many times to obtain graphene oxide bulk. The graphene oxide bulk is heat-treated to obtain a graphene bulk. USE - Method for preparing a graphene block used for fiber-reinforced graphene block, graphene sheet, for composite graphene sheet, and for fiber arrangement device (all claimed). ADVANTAGE - The method utilizes a layer-by-layer stacking method to convert the horizontal direction of graphene into a vertical direction to improve the vertical thermal conductivity, further enhance the thermal conductivity by arraying fibers in the multilayer graphene layer, and has the effect of improving the mechanical properties, and prevents cracking of the graphene bulk and the graphene sheet. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: 1. a fiber-reinforced graphene block, comprises a multi-layer graphene layer and a fiber array, where the multi-layer graphene layer is arranged along the thickness direction, the fiber array is perpendicular to the multi-layer graphene layer, and the thickness of the graphene block is 30-200 mm, and the spacing between the fibers of the fiber array is 0.2-2 mm, the thermal conductivity of the fibers of the fiber array is greater than or equal to 300 Watts per meter-Kelvin, and the diameter of the fibers of the fiber array is 5-50 microns, and the diameter of the fibers of the fiber array is 7-15 microns, where the fibers of the fiber array are carbon fibers, graphite fibers, graphene fibers or carbon nanotube fibers, and the fibers of the fiber array are single fibers or/and fiber bundles; 2. a preparation method of graphene sheet, which involves cutting graphene block along the direction parallel to the fiber to obtain a graphene sheet, where the cutting method is wire cutting, laser cutting, ultrasonic cutting, blade cutting, freezing cutting, vibration cutting or ultrasonic-freezing cutting; 3. a preparation method of composite graphene sheet, which involves immersing high molecular polymer in the described graphene sheet, solidifying, obtaining composite graphene sheet, impregnating high molecular polymer into the graphene sheet by vacuum impregnation, atmospheric impregnation or high pressure impregnation, where the curing is heating curing or room temperature curing, and high molecular polymer is epoxy resin, phenolic resin, furfural resin, polyurethane, acrylic resin, polybutene or organic silica gel, and the high molecular polymer is organic silica gel, and high molecular polymer is polydimethylcyclosiloxane, polydimethylsiloxane, α,ω-dihydroxy polydimethylsiloxane, polydiphenylsiloxane, α,ω-dihydroxypolymethyl(3,3,3-trifluoropropyl)siloxane, cyanosiloxysilane or α,ω-diethylpolydimethylsiloxane; 4. a fiber arrangement device, which includes for arranging the fiber array vertically on the base material, the fiber arranging device comprises a base material and a tie rod, and a multiple of holes are correspondingly arranged on the base material and the tie rod, fibers penetrate through one or more holes in the substrate or/and the tie rod, and exit from another hole or holes in the substrate or/and the tie rod to form an array of fibers; and 5. a coating device, which includes a bracket, a scraper and a scraper, the scraper is located on the back of the bracket, the scraper is arranged at one end of the scraper, and used to coat the graphene oxide slurry on the substrate, and the scraper is provided with a multiple of grooves for passing through the tie rods of the fiber arrangement devicefor fixing fibers, and the bracket and the scraper are detachably connected, and the coating device further includes an adjusting member for adjusting the distance between the top of the blade and the support.