▎ 摘　　要

NOVELTY - Preparing graphene electric heating film containing in-situ polymerized insulating coating comprises e.g. (i) placing the graphene aqueous dispersion in a suction filter device containing a polytetrafluoroethylene filter membrane, vacuum filtering for 3-4 hours, then drying at 70-90 degrees C for 3-4 hours, taking out the PTFE membrane with graphene film deposited on the surface, soaking in absolute ethanol, mechanically peeling and drying at room temperature to obtain graphene film, (ii) dissolving tetraethylorthosilicate and silane coupling agent in absolute ethanol, then adding ammonia and water, stirring for 10-30 minutes, adding organic solvent and toluene, heating to 100-120 degrees C, distilling off the ethanol and water, adding hydroxy resin with a hydroxy value of 80-120 mg potassium hydroxide/g and mixing, then uniformly coating the mixed product on the graphene film, and (iii) dissolving trimellitic anhydride in N-methylpyrrolidone. USE - The method is useful for preparing graphene electric heating film containing in-situ polymerized insulating coating. ADVANTAGE - The method: has good heat resistance; is not easy to age; good fitness; and does not need to add adhesive. DETAILED DESCRIPTION - Preparing graphene electric heating film containing in-situ polymerized insulating coating comprises (i) placing the graphene aqueous dispersion in a suction filter device containing a polytetrafluoroethylene filter membrane, vacuum filtering for 3-4 hours, then drying at 70-90 degrees C for 3-4 hours, taking out the polytetrafluoroethylene (PTFE) membrane with graphene film deposited on the surface, soaking in absolute ethanol, mechanically peeling and drying at room temperature to obtain graphene film, (ii) dissolving tetraethylorthosilicate and silane coupling agent in absolute ethanol, then adding ammonia and water, stirring for 10-30 minutes, adding organic solvent and toluene, heating to 100-120 degrees C, distilling off the ethanol and water, adding hydroxy resin with a hydroxy value of 80-120 mg potassium hydroxide/g and mixing, then uniformly coating the mixed product on the graphene film to obtain graphene film loaded with active silicon layer, (iii) dissolving trimellitic anhydride in N-methylpyrrolidone, then adding diisocyanate, heating to 120-140 degrees C, insulating for 2-3 hours, adding the sealing agent, carrying out heat preservation reaction for 1-2 hours to obtain polyamideimide prepolymer, uniformly coating on the graphene film loaded with active silicon layer, and heating to 180-200 degrees C, incubating for 1-2 hours for unblocking the polyamide-imide prepolymer, carrying out in-situ polymerization reaction with the active silicon layer to obtain graphene electric heating film with an in-situ polymerized insulating coating.