▎ 摘　　要

NOVELTY - Flexible heating film comprises a conductive structure comprising carbon nanotubes and/or graphene, and a polyimide backbone which is chemically linked to an aminated conductive structure via anhydride bonds. USE - As flexible heating film. ADVANTAGE - The flexible heating film generates heat more uniformly and has excellent performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing the flexible heating film comprising (a) dispersing graphene in vitriol oil, slowly adding p-nitroaniline at 56-65degrees Celsius, stirring for 1-3 hours, slowly adding stannous chloride, reacting for 4-6 hours, filtering and washing to neutrality and drying to obtain aminated graphene, or dispersing carbon nanotubes in polyphosphoric acid, slowly adding p-nitrobenzoic acid, stirring and reacting for 1-3 hours at 110-130degrees Celsius, slowly adding stannous chloride, and reacting at 50degrees Celsius for 4-6 hours, filtering and washing to neutrality and drying to obtain aminated carbon nanotubes, (b) adding solvent, aminated graphene and/or aminated carbon nanotubes in step (a), dispersant and surfactant in a sand mill, leaving still for 1.5-3 hours to obtain aminated conductive paste, and (c) dissolving 4,4-diaminodiphenyl ether in the prepared slurry, controlling the temperature at 0-2degrees Celsius, slowly adding pyromellitic anhydride and reacting at room temperature 0.5-2 hours to obtain a composite, coating the composite on a polyimide film or a polyethylene film, and drying in an oven at 100-200degrees Celsius to obtain the product.