▎ 摘　　要

NOVELTY - Preparing graphene oxide modified composite coating comprises (1) adding (2-4) g graphite, adding 100 ml concentrated sulfuric acid, adding the graphite powder into concentrated sulfuric acid, adding sodium nitrate 5 times the graphite mass and potassium perchlorate 3 times the graphite, adding potassium permanganate, controlling the temperature to be less than 20 degrees C, stirring uniformly, adding in 39 degrees C oil bath, continuously stirring, (2) raising the oil bath temperature to 95 degrees C, the ratio of sulfuric acid: deionized water: hydrogen peroxide: hydrochloric acid is 100: 170: 480: 400 volume ratio, adding de-ionized water to the reaction system, the mass concentration is 10% hydrogen peroxide, the mixed solution is ultrasonic centrifuging and using de-ionized water and hydrochloric acid with concentration of 1 mol/l to wash until the pH = 7, rotary steaming, drying, grinding processing to obtain the graphene oxide. USE - The method is useful for preparing graphene oxide modified composite coating. ADVANTAGE - The coating improves the corrosion resistance and the dispersibility of graphene oxide. DETAILED DESCRIPTION - Preparing graphene oxide modified composite coating comprises (1) adding (2-4) g graphite, adding 100 ml concentrated sulfuric acid, adding the graphite powder into concentrated sulfuric acid, adding sodium nitrate 5 times the graphite mass and potassium perchlorate 3 times the graphite, adding potassium permanganate, controlling the temperature to be less than 20 degrees C, stirring uniformly, adding in 39 degrees C oil bath, continuously stirring, (2) raising the oil bath temperature to 95 degrees C, the ratio of sulfuric acid: deionized water: hydrogen peroxide: hydrochloric acid is 100: 170: 480: 400 volume ratio, adding de-ionized water to the reaction system, the mass concentration is 10% hydrogen peroxide, the mixed solution is ultrasonic centrifuging and using de-ionized water and hydrochloric acid with concentration of 1 mol/l to wash until the pH = 7, rotary steaming, drying, grinding processing to obtain the graphene oxide, (3) according to the ratio of 1 g: 120 ml: 5 ml, mixing the halloysite nanotubes (HNTs), ethanol solution and (3-Aminopropyl)tiethoxysilane (APTES) reaction, mixing alcohol and de-ionized water for centrifugal processing, taking the lower layer solid, drying, grinding into powder to obtain APTES-HNTs composite material, (4) according to the proportion of 5 g: 1 g: 1 g, mixing the APTES-HNTs composite material, graphene oxide and N, N-dimethyl formamide, mixing with ethanol, centrifuging and washing, taking the lower solid, drying, grinding into powder to obtain HNTs-GO composite material, (5) vacuum drying the halloysite nanotubes-graphene oxide (HNTs-GO), according to the proportion of 1 g: 80 ml, mixing the HNTs-GO and benzotriazole (BTA)/ethanol solution with concentration of 80 mg/ml, rotary steaming, filtering, washing with ethanol, drying to obtain the BTA-HNTs-GO functionalized composite material, (6) preparing A component and B component according to the mass ratio, the component A comprises: E20: 40-52% BTA-HNTs-GO, 0.3-0.6 wt.% additives, 0.2-0.6 wt.% pigments and fillers, 30-45 wt.% organic solvent, 5-7 wt.% B component curing agent, 9-10 wt.% mix A component and B component evenly, adjusting the required viscosity to obtain graphene oxide modified composite coating.