▎ 摘　　要

NOVELTY - Coated aluminum sheet comprises passivated aluminum substrates, where a coating layer is successively laminated on the front and back surfaces of the substrate, and the coating layer is graphene-water-soluble silicone modified acrylic resin coating. The oxidized graphene-water-soluble silicone-modified acrylic resin coating is further laminated with an adhesive layer, a coating and a protective coating, where the coating is a chromate chemical pretreatment liquid and the adhesive layer is a polyurethane glue. USE - Coated aluminum sheet for notebook computer housing (claimed). ADVANTAGE - The coated aluminum sheet has good insulation, thermal conductivity and higher hardness, is not easy to distort and not easy to decolour and has good protection. DETAILED DESCRIPTION - Coated aluminum sheet comprises passivated aluminum substrates, where a coating layer is successively laminated on the front and back surfaces of the substrate, and the coating layer is graphene-water-soluble silicone modified acrylic resin coating. The oxidized graphene-water-soluble silicone-modified acrylic resin coating is further laminated with an adhesive layer, a coating and a protective coating, where the coating is a chromate chemical pretreatment liquid and the adhesive layer is a polyurethane glue. The coating layer is a polyvinyl chloride (PVC) and polyethylene terephthalate (PET) composite color film. The oxidized graphene-water-soluble silicone-modified acrylic resin coating comprises 65-77 wt.% water-soluble silicone-modified acrylic resin, 19.5-32.5 wt.% silane coupling agent and 0.1-4 wt.% graphene oxide. The silane coupling agent is diluted with deionized water to form a silane coupling agent dispersant, which is followed by adding dispersant to water-soluble silicone-modified acrylic resin along with mixing uniformly to form a mixed solution, and adding an aqueous dispersion of graphene oxide to the mixed solution to obtain an oxidized graphene-water-soluble silicone-modified acrylic resin coating. The graphene oxide is prepared by an improved Hummer's method. The protective coating comprises 21-25 wt.% difunctional urethane acrylate, 21-25 wt.% 2-hydroxy-3-phenoxypropyl acrylate, 0.7-2 wt.% siloxane leveling agent, 0.7-2 wt.% acrylated benzophenone, 22-25 wt.% ethyl acetate and 22-25 wt.% butyl acetate. The protective coating is prepared by mixing difunctional urethane acrylate and 2-hydroxy-3-phenoxypropyl acrylate to obtain a premix, adding siloxane leveling agent to the premix along with adding acrylated benzophenone, ethyl acetate and butyl acetate, stirring and mixing to obtain a mixture, and passing the mixture through a 450 mesh nylon filter to obtain protective coating. The coated aluminum plate is prepared by performing passivation of aluminum plate to form a substrate, and applying a chromate chemical pretreatment liquid having a mass concentration of 20-60% to each of the passivation aluminum plate substrates by a roll coating method to obtain a coating layer. The oxidized graphene-water-soluble silicone-modified acrylic resin coating is coated on the coating and dried at 150-210 degrees C to obtain graphene-water-soluble silicone modified acrylic resin coating. The urethane-water-soluble silicone-modified acrylic resin coating is coated on the front side with polyurethane glue and subjected to curing at 220-230 degrees C to obtain adhesive layer. The PVC and PET composite color film are coated on the adhesive layer at 220-230 degrees C. The protective coating and diluent are mixed uniformly on the PVC and PET composite color film at a mass ratio of 3:2 and thickness of 10-15 microns, dried by using hot air at 60-65 degrees C, and subjected to ultraviolet curing.