▎ 摘　　要

NOVELTY - Preparing high-performance composite film by spraying graphene composite electroconductive coating comprises (i) taking graphene, inorganic silica nanoparticle, inorganic metal copper nanoparticle, dispersant, neutralizer propanolamine, leveling agent, de-foaming agent, cross-linking agent, ethanol and water; (ii) adding organic solvent to composite graphene electroconductive coating; (iii) preheating a substrate; (iv) spraying the graphene coating on the substrate; (v) repeating steps (iii) and (iv) to obtain coating; and (vi) placing the coating in a vacuum tubular furnace, and annealing. USE - The composite film is useful in photovoltaic devices, electronic circuits and other fields. ADVANTAGE - The composite film has good optical, electrical and mechanical properties. DETAILED DESCRIPTION - Preparing high-performance composite film by spraying graphene composite electroconductive coating comprises (i) preparing composite graphene electroconductive coating by taking 100-115 pts. wt. graphene, 3-8 pts. wt. inorganic silica nanoparticle with diameter of 10-100 nm, 5-7 pts. wt. inorganic metal copper nanoparticle with diameter of 30-100 nm, 1-2 pts. wt. dispersant, 1-2 pts. wt. neutralizer propanolamine, 1-2 pts. wt. leveling agent, 1-2 pts. wt. de-foaming agent, 2-3 pts. wt. cross-linking agent, 50-80 pts. wt. ethanol, and 200-300 pts. wt. water; (ii) adding an organic solvent N,N-dimethyl formamide to the composite graphene electroconductive coating to obtain graphene composite coating dimethylformamide solution; (iii) preheating a substrate at 100-150 degrees C; (iv) spraying the composite graphene coating on the substrate using a spray coating, where the spraying temperature is 60-80 degrees C, the distance between the nozzle and the substrate surface is 1-3 cm, the spraying angle is 30-60 degrees , and the spraying time is 1-2 minutes; (v) repeating steps (iii) and (iv), repeating the spraying process for 5-7 times to obtain coating with good density and suitable thickness; and (vi) placing the resulting coating into a vacuum tubular furnace, under the protection of argon gas, annealing at 500-550 degrees C for 2 hours to obtain the composite film with composite graphene electroconductive coating.