▎ 摘　　要

NOVELTY - Heat-conductive film comprises 18-22 pts. wt. polyurethane, 30-35 pts. wt. dimethylacetamide, 3-5 pts. wt. foaming agent, 3-6 pts. wt. coupling agent, 10-15 pts. wt. graphene, 8-10 pts. wt. thermal silica, 5-9 pts. wt. glass fiber, 50-60 pts. wt. absolute ethanol, and 10-15 pts. wt. dispersant. USE - Heat-conductive film for automotive surfaces (claimed). ADVANTAGE - The heat-conductive film is prepared in a simple, convenient and cost-effective manner, which is used for large-scale production and industrial production. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing heat-conductive film, which involves: (A) mixing polyurethane with dimethylacetamide, then subjecting to ultrasonic stirring for 10-15 minutes, until the polyurethane is completely dissolved to obtain polyurethane solution; (B) mixing foaming agent is slowly with the prepared polyurethane solution, and spraying onto the substrate surface, and drying to obtain uniform insulation film; (C) adding dispersant to anhydrous ethanol under stirring until completely dissolved to obtain homogeneous viscous alcohol; (D) adding thermal silica and coupling agent to the alcohol solution, and subjecting to sealing micro-thermal reaction for 2-4 hours, to obtain dispersed silica gel alcohol solution; (E) adding graphene and glass fiber under stirring and then to the dispersion of silica gel alcohol solution and subjecting to ultrasonic reaction for 2-4 hours, to obtain conductive coating solution; and (F) spraying conductive coating solution onto the surface of the insulating film to obtain uniform thermal film, and placing in a reaction vessel then pressurizing under protective gas reaction for 3-5 hours to obtain desired product.