Thickened graphene oxide film, graphene heat conduction film and preparation method thereof

The invention relates to the technical field of heat conduction films, in particular to a thickened graphene oxide film, a graphene heat conduction film and a preparation method thereof.The preparation method of the thickened graphene oxide film comprises the following steps that a graphene oxide material cake with the solid content larger than 40% is taken, evenly mixed and extruded into a thin sheet; and folding the sheet and extruding the sheet under the condition of surface wetting, repeating the steps for many times, and gradually reducing the thickness of the sheet to obtain the thickened graphene oxide film. According to the preparation method, the high-thickness thickened graphene oxide film is produced in a double-roller processing mode, and compared with an existing graphene heat conduction film production process, the production efficiency is greatly improved, and the heat conduction coefficient of the thickened graphene heat conduction film in the longitudinal direction is improved. 本发明涉及导热膜技术领域，具