▎ 摘　　要

NOVELTY - Heating film printed with conductive ink comprises protective film layer, conductive ink layer and polyimide (PI) film layer in sequence. The conductive ink comprises 30-40 pts. wt. graphene, 10-15 pts. wt. pyromellitic dianhydride, 20-25 pts. wt. diaminodiphenyl ether, 10-15 pts. wt. benzene diol acrylic acid mixture, 20-30 pts. wt. polyurethane resin, 10-15 pts. wt. silicone resin, 5-10 pts. wt. silicon dioxide, 1-3 pts. wt. crosslinking agent, 5-10 pts. wt. barium titanate powder, 2-5 pts. wt. metal oxide powder and ~5 pts. wt. other additives. USE - The film is useful in automobile field, underfloor heating field and electronic product field. ADVANTAGE - The film: has good heating function and environment-friendly property; reduces the use of chemical etching liquid; improves the safety of using the heating film; uses the conductive ink with good printing performance; can be stably connected with the protective film layer (PI) film; is convenient to attach on the surface of the PI film, so that the conductive graphite has conductivity and PTC effect, which is good for controlling the temperature change of heating film, thus reducing the temperature of the film to be too high or too low and changes the ordering between the silicon resin and the graphene, barium titanate powder and metal oxide powder into disorder, when the temperature reaches a certain degree, thus increasing the resistance of the heat-resistant heating film and improves the safety. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the heating film printed with conductive ink comprising (a) mixing the graphene, pyromellitic dianhydride, diaminodiphenyl ether, benzene diol acrylic acid mixture, polyurethane resin, silicone, silicon dioxide, crosslinking agent and other auxiliary agent, mixing uniformly to obtain conductive inkand (b) printing the conductive ink to the PI film surface, curing at 140-160℃, forming a conductive ink layer, and thermally pressing the protective film on the conductive ink layer surface to obtain the heating film printed with conductive ink.