▎ 摘　　要

NOVELTY - Method for preparing thermal-insulating graphene electrothermal film by mixing and heating the silicone acrylic emulsion and aqueous-based fluorocarbon emulsion, stirring, forming film-shaped heat preservation bottom layer using blow molding machine, and adding the mixed resin, stirring, heating and concentrating, and performing chemical vapor deposition to prepare a graphene conductive film coating liquid, placing the graphene conductive film coating liquid in a spray gun and spraying on the surface of the metal base material, flattening on the graphene conductive film coating liquid using hot pressing roller, carrying out pre-vulcanization, and continuously vulcanizing in a drying oven to obtain the graphene electric heating film, and uniformly coating high-temperature resistant adhesive on one side of the thermal insulation bottom layer and the graphene electrothermal film, coating one side of the thermal insulation bottom layer with the graphene electrothermal film. USE - Method for preparing thermal-insulating graphene electrothermal film. ADVANTAGE - The method maintains high heat preservation performance, reduces radiant heat transfer, convective heat transfer and heat balance temperature on the surface of the object, and can effectively diffuse the heat of the graphene electrothermal film close to the ground in an application scenario requiring only one-sided heating. DETAILED DESCRIPTION - Method for preparing thermal-insulating graphene electrothermal film involves (i) mixing and heating the silicone acrylic emulsion and aqueous-based fluorocarbon emulsion, adding ceramic particles to a mixed solution in a weight ratio of 2:1, and adding 80-90% mixed resin to the mixed solution mixed with the ceramic particles, introducing the mixed resin to a high-speed stirrer, stirring for 30-40 minutes, uniformly mixing, forming film-shaped heat preservation bottom layer using a blow molding machine, (ii) placing the metal base material in ultrasonic cleaner and washing with ionized water and ethanol, air-drying, adding additive solvent to the graphene, stirring for 30 minutes at a constant speed, carrying out ultrasonic dispersion for 50 minutes, and adding the mixed resin, placing in a high-speed stirrer, stirring for 40-60 minutes, heating and concentrating, and carrying out chemical vapor deposition to prepare a graphene conductive film coating liquid, after defoaming the graphene conductive film coating liquid, placing the graphene conductive film coating liquid in a spray gun, uniformly spraying the graphene conductive film coating liquid on the surface of the metal base material, carrying out rolling, flattening on the graphene conductive film coating liquid using hot pressing roller at 55-65 degrees C, carrying out pre-vulcanization, and continuously vulcanizing for 2-3 in a drying oven at 90-95 degrees C to obtain the graphene electric heating film, and (iii) uniformly coating high-temperature resistant adhesive on one side of the thermal insulation bottom layer obtained in the step (i) and the graphene electrothermal film obtained in the step (ii), coating one side of the thermal insulation bottom layer with the graphene electrothermal film with high-temperature-resistant adhesive at high pressure and high temperature, and cooling.