▎ 摘　　要

NOVELTY - Preparing graphene film comprises (i) adding asphalt powder into an aqueous solution containing a surfactant to form a mixed system, (ii) adding graphite oxide into deionized water to disperse to form a slurry, ultrasonically stirring and dispersing to obtain a uniformly dispersed graphene oxide slurry, (iii) mixing the emulsion and the graphene oxide slurry thoroughly in a vacuum mixer, and processing through a homogenizer to obtain a graphene oxide/pitch composite slurry, (iv) coating composite slurry on a coating machine to form a film, drying and forming the film to obtain a graphene oxide/pitch composite film, (v) hot pressing the composite film to allow the nano-pitch particles to reach a softening point, (vi) carbonizing the composite film and keeping warm to complete graphitization, and (vii) rolling the graphene film and compacting. USE - The method is useful for preparing graphene film. ADVANTAGE - The method improves the heat conduction path of graphene and heat conduction effect. DETAILED DESCRIPTION - Preparing graphene film comprises (i) adding asphalt powder into an aqueous solution containing a surfactant to form a mixed system with an asphalt content of 1-10%, and performing a frosting treatment until the particle size reaches less than 100 nm to form a stable dispersion emulsion, (ii) adding graphite oxide into deionized water to disperse to form a slurry with a solid content of 2-6%, ultrasonically stirring and dispersing to obtain a uniformly dispersed graphene oxide slurry, (iii) mixing the emulsion and the graphene oxide slurry thoroughly in a vacuum mixer, and processing through a homogenizer at a pressure of 120 Mpa for 2-3 times to obtain a graphene oxide/pitch composite slurry, (iv) coating the composite slurry on a coating machine to form a film with a thickness of 2-10 mm, and drying and forming the film to obtain a graphene oxide/pitch composite film, (v) hot pressing the composite film to allow the nano-pitch particles to reach a softening point, and applying pressure to make the softened pitch fill the pores inside the film to prepare a dense graphene oxide composite film, (vi) carbonizing the composite film by heating to 1500 degrees C at a rate of 5 degrees C/minute, and heating to 2850 degrees C at 20 degrees C/minute, and keeping warm to complete graphitization and preparing a graphene film with a density of 0.6-0.8 g/cm3, and (vii) rolling the graphene film and compacting to a density of 1.8-2.1 g/cm3 to obtain a high thermal conductivity graphene heat dissipation film.