▎ 摘　　要

NOVELTY - Preparing thermally conductive graphene film involves immersing graphite in mixed acid solution, and adding intercalating agent under stirring to obtain mixed solution. The obtained mixed solution is added with organic reagent to obtain aqueous dispersion of graphene. The aqueous dispersion of graphene is added with natural long fiber or polymer long fiber to obtain mixture, which is subjected to supercritical ultrasonic treatment to obtain mixed dispersion liquid. The mixed dispersion liquid is applied on substrate, which is then dried at 500-900 degrees C for 15-30 minutes. USE - Method for preparing thermally conductive graphene film (claimed). ADVANTAGE - The method enables to prepare thermally conductive graphene film, which has high degree of orientation, 1000-1500W/mK thermal conductivity and 3070 megapascals mechanical tensile strength. DETAILED DESCRIPTION - Preparing thermally conductive graphene film involves immersing graphite in mixed acid solution, and adding intercalating agent under stirring to obtain mixed solution. The obtained mixed solution is added with organic reagent to obtain aqueous dispersion of graphene. The aqueous dispersion of graphene is added with natural long fiber or polymer long fiber to obtain mixture, which is subjected to supercritical ultrasonic treatment to obtain mixed dispersion liquid. The mixed dispersion liquid is applied on substrate, which is then dried at 500-900 degrees C for 15-30 minutes to obtain thermally conductive graphene film.