▎ 摘　　要

NOVELTY - Preparing composite film involves crushing bacterial cellulose membrane by high pressure homogenization mechanical, bacterial cellulose is homogenized. Then 2,2,6,6-tetramethyl-1-piperidone (TEMPO)/sodium bromide/sodium hypochlorite is applied in total oxidation system for bacterial cellulose. 6C primary hydroxyl position is selectively oxidized and oxidized bacterial cellulose is washed with water. Then, it is centrifuged to obtain a post-oxidation microcrystalline cellulose containing a carboxyl group. USE - Method for preparing composite film (claimed). DETAILED DESCRIPTION - Preparing composite film involves crushing bacterial cellulose membrane by high pressure homogenization mechanical, bacterial cellulose is homogenized. Then 2,2,6,6-tetramethyl-1-piperidone (TEMPO)/sodium bromide/sodium hypochlorite is applied in total oxidation system for bacterial cellulose. 6C primary hydroxyl position is selectively oxidized and oxidized bacterial cellulose is washed with water. Then, it is centrifuged to obtain a post-oxidation microcrystalline cellulose containing a carboxyl group. Polyether amine solution and graphene oxide dispersion are added to the oxidation in accordance with a certain proportion of the microcrystalline cellulose slurry and mixed by stirring. Then, 1-ethyl-3- (3-dimethylaminopropyl)- arbodiimide (EDC) and N- hydroxysuccinimide (NHS) amidation reagents are added and reaction is carried out at room temperature, so that the amine-terminated polyether and ammonia are oxidized by bacterial cellulose surface oxidation and carboxyl carboxy graphene amide bond is formed to obtain made of composite materials.