▎ 摘　　要

NOVELTY - Preparing graphene composite film involves taking 3-5 pts. wt. graphite. The obtained graphite is added with water that is 25-30 times of mixed acid solution. The temperature of the obtained mixture is raised at 50-60 degrees C for 1-2 hours. The obtained mixture is filtered. The obtained precipitate is washed. The obtained washed product is vacuum dried at 100-110 degrees C completely to obtain the graphene oxide. 110-120 is added with 10-14 times of anhydrous ethanol. The obtained mixture is stirred uniformly. USE - Method for preparing graphene composite film (claimed). ADVANTAGE - The method enables to prepare graphene composite film with improved surface strength and toughness, and good weather resistance property. DETAILED DESCRIPTION - Preparing graphene composite film involves taking 3-5 pts. wt. graphite. The obtained graphite is added with water that is 25-30 times of mixed acid solution. The temperature of the obtained mixture is raised at 50-60 degrees C for 1-2 hours. The obtained mixture is filtered. The obtained precipitate is washed. The obtained washed product is vacuum dried at 100-110 degrees C completely to obtain the graphene oxide. 110-120 is added with 10-14 times of anhydrous ethanol. The obtained mixture is stirred uniformly. The obtained stirred mixture is added with 3-amino propyl triethoxy silane. The temperature of the obtained mixture is raised at 60-65 degrees C for 2-3 hours. The obtained mixture is distilled to remove the ethanol. The obtained mixture is dried to obtain aminated cellulose. 0.7-1 pts. wt. initiator is added with 20-30 times of de-ionized water. The obtained mixture is stirred uniformly. 30-35 pts. wt. maleic anhydride and 1-2 pts. wt. casein are mixed. The obtained mixture is added with 7-10 times of deionized water. The obtained mixture is stirred uniformly. The obtained mixture is fed in a reaction kettle. Nitrogen is introduced in the reaction kettle. The reaction temperature is 70-75 degrees C. The initiator aqueous solution is dropped in a mixture. The obtained mixture is reacted for 2-3 hours. The obtained mixture is discharged to to obtain the polyamide solution. 3-4 pts. wt. graphene oxide and 3-4 pts. wt. methyl benzene sulfonic acid are mixed. The obtained mixture is stirred at 80-90 degrees C for 20-30 minutes. The obtained mixture is added with aminated cellulose. The obtained mixture is stirred on water bath at 55-60 degrees C for 1-2 hours. The obtained mixture is added in a polyamide solution. The obtained mixture is ultrasonically stirred for 10-15 minutes. Crosslinking amide dispersion, 20-30 pts. wt. acetone and Span (RTM: nonionic surfactant)80 are mixed. The obtained mixture is stirred uniformly. The obtained mixture is defoamed and filtered to obtain membrane preparing liquid. The obtained membrane preparing liquid is coated on stainless steel of thickness 100-600 microns. The obtained product is dried at 60-70 degrees C.