▎ 摘　　要

NOVELTY - Expanded polytetrafluoroethylene film coated composite material comprises one expanded polytetrafluoroethylene film layer (2), a graphene conductive heat transfer coating layer (3) and a silica aerogel coating (1). One side of the expanded polytetrafluoroethylene film is coated with a graphene conductive heat-transfer coating and the other side is coated with a silica airogel coating. USE - Expanded polytetrafluoroethylene film coated composite material. ADVANTAGE - The expanded polytetrafluoroethylene film coated composite material has a functions of heat conduction, heat insulation, electrical conductivity and electromagnetic shielding. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) a method for preparing composite material, which involves preparing the graphene conductive heat transfer coating liquid for graphene conductive heat transfer coating and silicon dioxide gas gel for coating of silica aerogel coating liquid, unreeling the bulked polytetrafluoroethylene film on the membrane surface coating, volatilizing the solvent by drying, cutting, checking, coiling and curing the coating, unwinding the coated graphene conductive heat transfer coating of expanded polytetrafluoroethylene film, coating prepared silicon dioxide aerogel coating liquid on the other surface of the film roll, adopting drying method the solvent volatilizing process and cutting, checking, coiling and curing the coating; (2) a method for forming graphene conductive heat transfer coating, which involves adding 50-70 wt.% polyurethane resin, 5-40 wt.% graphite micro-powder, 0-10 wt.% polyaniline powder and 0-10 wt.% conductive carbon black powder, adding graphite micropowder in the polyurethane resin, adding polyaniline powder and conductive carbon black powder in obtained mixture, using ethyl acetate as solvent, stopping adding ethyl acetate until the viscosity index of the solution reaches 1000-3000cps, stirring and oscillating the obtained mixture for 8-12 hours, so that the powder dispersed uniformly in the solution, discharging microbubbles in the solution to enter the next working procedure and coating the expanded polyfluortetraethylene film layer surface; and (3) a method for forming silica aerogel coating, which involves adding 40-70 wt.% urethane resin and 15-60 wt.% silicon dioxide aerogel powder, adding silicon dioxide aerogel powder in the polyurethane resin, using ethyl acetate as solvent, until the viscosity index of the solution reaches 1000-3000cps, stopping adding ethyl acetate, diluting, stirring and oscillating the mixture for 1-2 hours, so that the micro-powder is dispersed uniformly in the solution, discharging microbubbles in the solution to enter the next working procedure and coating the expanded polyfluortetraethylene film surface. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of an expanded polytetrafluoroethylene film coated composite material. Silica aerogel coating (1) Expanded polytetrafluoroethylene film layer (2) Graphene conductive heat transfer coating layer (3)