▎ 摘　　要

NOVELTY - Composite heat-radiating sheet capable of being made thin and having excellent flexibility comprises a metal base layer (110), thermal diffusion layer comprises a graphene sheet (120a) formed on at least one surface of the metal base layer and a polyamide imide (PAI) coating layer formed on one surface of the thermal diffusion layer. USE - Composite heat-radiating sheet capable of being made thin and having excellent flexibility used in mobile device (claimed). ADVANTAGE - The composite heat-radiating sheet capable of being made thin and having excellent flexibility has good flexibility, so it can be easily applied to miniaturized mobile devices and the latest trend edge display or flexible display, improve heat dissipation performance and electromagnetic wave shielding compared to the existing ones, flexibility of the heat dissipation sheet, heat dissipation performance and electromagnetic wave shielding performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing a composite heat dissipation sheet, which involves forming a thermal diffusion layer comprising a graphene sheet on one surface of the metal substrate layer and forming a coating layer by coating a PAI resin on one surface of the thermal diffusion layer. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a sheet. Metal base layer (110) Graphene sheet (120a) Polyamide-imide resin (130a) Adhesive layer (140)