▎ 摘　　要

NOVELTY - Preparing graphene oxide-silicon nitride composite powder/urushiol formal composite coating comprises (1) mixing urushiol xylene solution, formaldehyde solution, aqueous ammonia and tetrabutylammonium chloride and heating, continuously heating, stopping reaction, and stirring reaction reaches certain viscosity, (2) mixing absolute ethanol, distilled water and silane coupling agent KH-560, adding graphene oxide to feed liquid, centrifuging, washing, and vacuum drying and grinding, (3) mixing absolute ethanol, distilled water and silane coupling agent KH-550, adding silicon nitride to material liquid, heating and stirring, centrifuging, and vacuum drying and grinding, (4) ultrasonically dispersing modified graphene oxide and modified silicon nitride in N,N-dimethylformamide, reacting with stirring, centrifuging, washing, and vacuum drying and grinding, and (5) adding graphene oxide-silicon nitride composite powder to urushiol formal solution, stirring and uniformly mixing. USE - The method is useful for preparing graphene oxide-silicon nitride composite powder/urushiol formal composite coating. ADVANTAGE - The composite coating: high hardness, strong adhesion and excellent anti-corrosion performance after film formation; is non-toxic and non-allergenic. DETAILED DESCRIPTION - Preparing graphene oxide-silicon nitride composite powder/urushiol formal composite coating comprises (1) mixing the urushiol xylene solution, formaldehyde solution, aqueous ammonia and tetrabutylammonium chloride in a mass ratio of 100:10:1:2 and heating up to 90-100degrees Celsius, keeping the temperature for 2 hours, continuously heating up to 145-160degrees Celsius, stopping the reaction after the temperature, and stirring reaction reaches certain viscosity to obtain the urushiol formal solution, (2) mixing the absolute ethanol, distilled water and silane coupling agent KH-560 with a mass ratio of 18:0.5:2, adding 1 wt.% graphene oxide to the feed liquid, uniformly dispersing by ultrasonic, keeping stirring at 80degrees Celsius for 5-7 hours, centrifuging, washing, and vacuum drying and grinding to obtain modified graphene oxide, (3) mixing the absolute ethanol, distilled water and silane coupling agent KH-550 with a mass ratio of 18:0.5:2, adding 1 wt.% silicon nitride to the material liquid, ultrasonically dispersing it uniformly, heating and stirring at 80degrees Celsius for 5-7 hours, centrifuging, washing, and vacuum drying and grinding to obtain modified silicon nitride, (4) ultrasonically dispersing the modified graphene oxide prepared in the step (2) and the modified silicon nitride prepared in the step (3) in N,N-dimethylformamide, reacting with stirring at 120degrees Celsius for 6 hours, centrifuging, washing, and vacuum drying and grinding to obtain modified graphene oxide-silicon nitride composite powder, and (5) adding the graphene oxide-silicon nitride composite powder prepared in the step (4) to the urushiol formal solution prepared in the step (1), stirring and uniformly mixing to obtain modified graphene oxide-silicon nitride composite powder/urushiol formal composite coating. An INDEPENDENT CLAIM is also included for graphene oxide-silicon nitride composite powder/urushiol formal composite coating prepared by preparation method.