▎ 摘　　要

NOVELTY - Method for preparing flexible graphene thermally conductive film, involves placing impregnated bacterial cellulose film under pressing device, pressing, placing the pressed product in heat treatment device, subjecting the product to high temperature heat treatment under argon gas to obtain flexible graphene heat conductive film, diluting graphene paste in water to obtain graphene impregnation liquid, soaking flexible bacterial cellulose film in graphene impregnation liquid, placing on a shaker, shaking, mixing graphite powder, placing the mixture in ball mill, mixing zirconia, adding beads to ball mill tank, ball milling the mixture, dispersing the ball mill, placing the ball mill dispersion in centrifuge, centrifuging, separating the lower layer precipitate to obtain upper graphene dispersion, subjecting upper graphene dispersion to secondary centrifugation and removing the supernatant liquid and collecting the underlying graphene paste. USE - The method is useful for preparing flexible graphene thermally conductive film (claimed). ADVANTAGE - The method enhances transmission of phonons and electrons at interface of graphene, converts sp3 hybridized carbon atoms in film into sp2 hybrid forms after high temperature heat treatment, and improves transmission of electrons and phonons in the graphene sheet and thermal conductivity of film. DETAILED DESCRIPTION - Method for preparing flexible graphene thermally conductive film, involves placing impregnated bacterial cellulose film under pressing device, pressing, placing the pressed product in heat treatment device, subjecting the product to high temperature heat treatment under argon gas to obtain flexible graphene heat conductive film, diluting graphene paste in water to obtain graphene impregnation liquid having a mass concentration of 25 mg/ml, soaking flexible bacterial cellulose film in graphene impregnation liquid, placing on a shaker, shaking to obtain impregnated bacterial cellulose film, mixing graphite powder with lecithin and deionized water, placing the mixture in ball mill, mixing zirconia with a diameter of 2 mm and a diameter of 0.2 mm to obtain mixed ball bead, adding beads to ball mill tank, ball milling the mixture for 20-24 hours, dispersing the ball mill, placing the ball mill dispersion in centrifuge, centrifuging, separating the lower layer precipitate to obtain upper graphene dispersion, subjecting upper graphene dispersion to secondary centrifugation and removing the supernatant liquid and collecting the underlying graphene paste, where the flexible bacterial cellulose film are prepared by mixing coconut juice, grape juice and water, adding the mixture into a beaker, stirring and mixing for 15-20 minutes to obtain fermentation substrate, transferring the fermentation substrate to the airlift type fermentation tank, adding wood vinegar to the fermenter, performing ventilation and fermentation, forming the flexible film by the fermentation product and the air interface in the fermenter with tweezers, repeatedly washing with distilled water for 3-5 times, placing the mixture in water bath to heat-treat to remove the residual cells, and drying the bacterial cellulose film.