▎ 摘　　要

NOVELTY - Preparing grapheme-carbon fiber composite membrane, comprises (i) dispersing graphite oxide in deionized water, ultrasonicating, and dispersing, (ii) adding high thermal conductivity carbon fiber powder into concentrated sulfuric acid, acidifying and activating the surface of the carbon fiber, washing and drying to obtain acidified fiber powder, (iii) adding the high thermal conductivity carbon fiber powder for 5% of the graphene oxide content into the slurry, and fully mixing in a vacuum mixer to obtain a graphene oxide-carbon fiber composite slurry, (iv) coating the composite slurry on a coating machine to form a film, and drying to obtain a graphene oxide/carbon fiber composite film, (v) heating the composite film and keeping warm to complete graphitization to obtain graphite olefin film, and (vi) subjecting to flat pressing under a pressure, and compacting to a density of 1.6-2 g/cm3, and obtaining high thermal conductivity graphene/carbon fiber composite heat dissipation film. USE - The method is useful for preparing grapheme-carbon fiber composite membrane. DETAILED DESCRIPTION - Preparing grapheme-carbon fiber composite membrane, comprises (i) dispersing graphite oxide in deionized water to prepare a slurry with a solid content of 4-6%, ultrasonicating, stirring and dispersing to obtain a uniformly dispersed graphene oxide slurry, and controlling the viscosity of the material to more than 40,000 mpas, (ii) adding 1 pts. wt. high thermal conductivity carbon fiber powder into 20 pts. wt. concentrated sulfuric acid, acidifying and activating the surface of the carbon fiber, washing and drying to obtain acidified fiber powder, (iii) adding the high thermal conductivity carbon fiber powder for 5% of the graphene oxide content into the slurry, and fully mixing in a vacuum mixer to obtain a graphene oxide-carbon fiber composite slurry, (iv) coating the composite slurry on a coating machine to form a film with a coating thickness of 2-10 mm, and drying to form a film to obtain a graphene oxide/carbon fiber composite film, (v) heating the composite film to 1500 degrees C at a rate of 5 degrees C/minute, and keeping warm to complete carbonization, and heating to 2850 degrees C at a rate of 20 degrees C/minute, and keeping warm to complete graphitization to obtain graphite olefin film, and (vi) subjecting the graphene film to flat pressing under a pressure of 100 mpa, and compacting to a density of 1.6-2 g/cm3, and obtaining the high thermal conductivity graphene/carbon fiber composite heat dissipation film, and the thermal conductivity in the in-plane direction can reach 1200W/(mK), and the thermal conductivity in the vertical direction can reach more than 30W/(mK).