▎ 摘　　要

NOVELTY - Preparing zinc oxide/silver/graphene nanocomposite involves adding graphene oxide to the ethanol-water mixed solution, then sonicating for 5-60 minutes to prepare a graphene oxide solution with a concentration of 1-20 mg/mL, and volume ratio of ethanol to water in the ethanol-water mixed solution is 1-10:1. The 3-aminopropyltriethoxysilane is dropped dropwise into the graphene oxide solution, and after stirred stably, continue stirred at room temperature for 0.5-3.0 hours. The volume ratio of 3-aminopropyltriethoxysilane to the graphene oxide solution is 1:28-52. The silver nitrate aqueous solution is dropped into the solution, put into the reaction kettle after the dropwise addition, and reacted at 100-160 degrees C for 2-24 hours, and after cooling to room temperature, graphene oxide modified with nano-silver particles is obtained, and then washed twice with ethanol and centrifuged. USE - Method for preparing zinc oxide/silver/graphene nanocomposite used in the preparation of electromagnetic shielding anti-ultraviolet multifunctional coating (claimed). ADVANTAGE - The method enables to prepare zinc oxide/silver/graphene nanocomposite, that has obvious ultraviolet absorption function and electromagnetic shielding effect. DETAILED DESCRIPTION - Preparing zinc oxide/silver/graphene nanocomposite involves adding graphene oxide to the ethanol-water mixed solution, then sonicating for 5-60 minutes to prepare a graphene oxide solution with a concentration of 1-20 mg/mL, and volume ratio of ethanol to water in the ethanol-water mixed solution is 1-10:1. The 3-aminopropyltriethoxysilane is dropped dropwise into the graphene oxide solution, and after stirred stably, continue stirred at room temperature for 0.5-3.0 hours. The volume ratio of 3-aminopropyltriethoxysilane to the graphene oxide solution is 1:28-52. The silver nitrate aqueous solution is dropped into the solution, put into the reaction kettle after the dropwise addition, and reacted at 100-160 degrees C for 2-24 hours, and after cooling to room temperature, graphene oxide modified with nano-silver particles is obtained, and then washed twice with ethanol and centrifuged. The graphene oxide modified with nano silver particles after centrifugation is dissolved in ethanol and stored. The concentration of silver nitrate in the silver nitrate aqueous solution is 0.01-0.7 mol/L. The volume ratio of the silver nitrate aqueous solution to the prepared solution is 5:28-52. The zinc acetate dihydrate is dissolved in dimethyl sulfoxide to obtain a solution of zinc acetate dihydrate in dimethyl sulfoxide, which is then added dropwise to the prepared solution with stirring, where the drop rate is 1-2.5 mL/minute. The stirring speed is 700-900 revolutions/minute. The volume ratio of the zinc acetate dimethyl sulfoxide dihydrate solution to the solution prepared is 20:16-30. The sodium hydroxide in ethanol is dissolved to obtain a sodium hydroxide ethanol solution, and then added the sodium hydroxide ethanol solution dropwise to the obtained solution, and after the addition is complete, stirred for 2-4 hours to obtain zinc oxide/silver/graphene nanocomposite. The concentration of sodium hydroxide in the sodium hydroxide ethanol solution is 1-50 mg/10-200 mL. The volume ratio of the sodium hydroxide ethanol solution to the obtained solution is 40:30-56. An INDEPENDENT CLAIM is included for a method of using zinc oxide/silver/graphene nanocomposite for an electromagnetic shielding anti-ultraviolet multifunctional coating, which involves adding the zinc oxide/silver/graphene nanocomposite to the waterborne polyurethane, and stirring uniformly, coating on the substrate and drying at 80-120 degrees C for 1-10 hours to form an electromagnetic shielding anti-ultraviolet multi-functional coating, and mass ratio of zinc oxide/silver/graphene nanocomposite to waterborne polyurethane is 0.1-10:100.