▎ 摘　　要

NOVELTY - A graphene coating is prepared by (1) weighing 0.3-4 %mass double-layered graphene, 0.45-6 %mass graphene oxide, 0.05-0.5 %mass acrylic acid resin, 0.5-0.8 %mass 1,3-diisopropylcarbodiimide, 35-48 %mass nitric acid solution, and balance amount of ethanol solution, uniformly mixing and stirring at 35-40 degrees C to obtain graphene slurry, and (2) weighing 5-22 %mass graphene slurry, 3-18 %mass epoxy resin, 12-35 %mass polyvinylidene fluoride resin, 0.5-3.2 %mass cellulose, 1-3 %mass silicon dioxide, 0.03-0.8 %mass diacetone alcohol, 2-2.8 %mass ethyl silicate, and balance amount of water, and uniformly mixing at 120-160 degrees C. USE - Graphene coating used for circuit substrate (claimed). ADVANTAGE - The graphene coating has improved strength, excellent stability, radiating performance and safety, and prolonged service life. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for application of graphene coating for circuit substrate, which involves including a conductive layer, insulation layer and a graphene heat conduction layer from top to bottom. The graphene heat conduction layer is formed by laminating several sheets of graphene oxide. The cross-sectional shape of the insulating layer is a rectangular structure. A lower surface of the insulating layer is provided with a lower fixing groove. A top of the lower fixing groove is uniformly provided with several ribs (I). The cross-sectional shape of the ridge (I) is a right-angled triangular structure. The graphene heat conduction layer is fixed in the lower fixing groove. AN upper surface of the insulating layer is symmetrically provided with two chamfers. A ridge (II) corresponding to the chamfer of the insulating layer is arranged on the conductive layer. The ridge is vertically provided with a plug strip. The plug strip is provided with a fixing portion and a plug portion. The fixing portion of the elongated structure is fixed on the ridge (II). An insertion portion having a circular arc-shaped structure is fixed on the fixing portion. The plug strip is inserted in the chamfered slot. The insulating layer is cast from epoxy resin. The graphene coating is applied on the outer surface of the insulating layer with thickness of 0.3-2 mm. A support block is arranged on an upper surface of the insulating layer. The cross-sectional shape of the support block is a rectangular structure. The bottom of the support block is recessed inward to form a support groove. The cross-sectional shape of the support groove is an obtuse triangular structure. The top angle a of the support groove is 160 degrees C.