▎ 摘　　要

NOVELTY - The method involves taking a graphene oxide film or composite film as raw material. The film is firstly punched for sequentially-treating, carbonizing, graphitizing to obtain a graphite film. The film is put in the container, stepped for heating. The temperature is kept to more than 200 degrees centigrade, where the pre-treatment time is bout three hours. The film is carbonized at a temperature not lower than 600 degrees centigrade, where the carbonizing time is about ten minutes. The film is graphitized at a temperature of not less than 2200 degrees centigrade, where the graphitizing time is five minutes. A punching process is included for punching according to the pre-set hole density, the aperture and the parameter of the hole depth. USE - Method for preparing graphite film e.g. heat conducting film used in heat conducting film, heating film, heat conducting plate, heating screen, chip, display screen, capacitor, lithium battery current collector, diaphragm, sensor, seawater desalination separation membrane, electromagnetic shielding film, protective film, acoustic noise reduction, energy storage and adsorption. ADVANTAGE - The method enables solving the problem that the graphene oxide film to be easy to crack in the thermal expansion process, at the same time, it does not introduce any impurities, it also avoids the influence of the graphite film heat conduction, conductivity, in addition, it greatly shortens the heat treatment time of the film, and it greatly reduces the easy operation of heat treatment. The method is physical effect, not introducing impurities. It does not change the functional group and component of GO, so it also ensures the normal thermal expansion. The airbag generated after film thermal expansion, it can be changed into wrinkle by the calendering process, repairing the hole generated by the artificial hole, it will not generate bad influence to the mechanical property, the film is processed by high temperature pre-treatment. DESCRIPTION OF DRAWING(S) - The drawing shows a pictorial view of an SEM image of the graphene oxide film before punching.