▎ 摘　　要

NOVELTY - Preparation of graphene heat dissipation film involves (1) formulating graphite oxide with a particle size of 100-1000 mu m into 1-5 %mass uniform dispersion liquid by water, adding hydrogen peroxide or ammonia as modifier to chemically modify the dispersion, using vacuum disperser for homogenization and deaeration, obtaining modified graphite oxide slurry, (2) applying the modified graphite oxide slurry evenly on the permeable nylon cloth with a spatula, forming a graphite oxide film with a thickness of 1-5 mm, drying at 30-50 degrees C to remove moisture, peeling the substrate, obtaining modified graphite oxide film with a thickness of 10-200 mu m, (3) heating the modified graphite oxide film in a rolling heating platform to 50-100 degrees C, leading to the infrared radiation heating platform for self-propagating peeling, obtaining few layers of exfoliated graphene film, (4) heating, naturally cooling, obtaining graphene foam, (5) calendaring the graphene foam into film, and cutting. USE - Preparation of graphene heat dissipation film. ADVANTAGE - The method can avoid uneven decomposition of functional groups and increase the efficiency of pretreatment. The method uses graphene has high single layer rate and large size. The prepared graphene heat dissipation film has excellent thermal conductivity, and high strength. The preparation process does not use any toxic and harmful chemical reagents, and is simple and efficient, and achieves high-quality reduction of graphite oxide film. DETAILED DESCRIPTION - Preparation of graphene heat dissipation film involves (1) formulating graphite oxide with a particle size of 100-1000 mu m into 1-5 %mass uniform dispersion liquid by water, adding hydrogen peroxide or ammonia as modifier to chemically modify the dispersion, using vacuum disperser for homogenization and deaeration, obtaining modified graphite oxide slurry, (2) applying the modified graphite oxide slurry evenly on the permeable nylon cloth with a spatula, forming a graphite oxide film with a thickness of 1-5 mm, drying at 30-50 degrees C to remove moisture, peeling the substrate, obtaining modified graphite oxide film with a thickness of 10-200 mu m, (3) heating the modified graphite oxide film in a rolling heating platform to 50-100 degrees C, leading to the infrared radiation heating platform for self-propagating peeling, obtaining few layers of exfoliated graphene film, (4) increasing the temperature of the few layers of exfoliated graphene film to 1000-1200 degrees C at 5-10 degrees C/minute under an inert atmosphere, leaving still for 0.5-2 hours, increasing the temperature to 2600-3000 degrees C at the rate of 10-50 degrees C, heat-preserving for 0.5-2 hours, naturally cooling, obtaining graphene foam, (5) using a calender to calendaring graphene foam into a film, and cutting. The modifier is added in an amount of 0.1-0.3 times with respect to the mass of graphite oxide.