▎ 摘　　要

NOVELTY - Preparing graphene anticorrosion coating involves putting 72% concentrated sulfuric acid in ice cooling tank, cooled to 0-3 degrees C, placing in an ice water bath, adding three bottles of graphite powder, sodium nitrate and concentrated sulfuric acid, mechanical stirring for 10-30min, adding potassium permanganate, controlling reaction temperature in the three-vial bottle between 10-15 degrees C, mechanical stirring for 1-2h. The three bottle water bath is heated to 80-95 degrees C, slowly dropping distilled water and hydrogen peroxide, and mechanical stirring for 30-120min. USE - Method for preparing graphene anticorrosion coating. ADVANTAGE - The method enables to prepare graphene anticorrosion coating, which has a better dispersion effect, and greatly increases the amount of the graphene incorporation and better utilizes the excellent performance of the graphene. DETAILED DESCRIPTION - Preparing graphene anticorrosion coating involves putting 72% concentrated sulfuric acid in ice cooling tank, cooled to 0-3 degrees C, placing in an ice water bath, adding three bottles of graphite powder, sodium nitrate and concentrated sulfuric acid, mechanical stirring for 10-30min, adding potassium permanganate, controlling reaction temperature in the three-vial bottle between 10-15 degrees C, mechanical stirring for 1-2h. The three bottle water bath is heated to 80-95 degrees C, slowly dropping distilled water and hydrogen peroxide, and mechanical stirring for 30-120min. The color of the solution changes from dark brown to bright yellow, it is filtered while hot and washed with 5% hydrochloric acid solution. The centrifugation and washing with distilled water is performed until the solution is near neutral, vacuum dried at 50-80 degrees C to obtain graphite oxide. The weight ratio of the graphite powder, 72% concentrated sulfuric acid, sodium nitrate, potassium permanganate, hydrogen peroxide, distilled water is: 1:35-45:0.4-0.7:3-5:2-5:90-150. The graphite oxide is dispersed in water, ultrasonically dispersed for 10-30 min into a uniform suspension solution, sodium hydroxide and sodium chloroacetate are added. The bath is sonicated for 1-2h and then neutralized with dilute HCl solution to convert hydroxyl and epoxy groups on the graphene oxide to carboxyl groups. After washing with deionized water to neutrality, vacuum drying is performed at 50-80 degrees C to obtain carboxylated graphene (CO-GOOH). The weight ratio of the graphite oxide, water, sodium hydroxide and sodium chloroacetate is: 1:1000:40-50:45-60. Ethylenediamine and methanol are added dropwise to a nitrogen-protected three-necked flask and stirred magnetically in an ice-water bath. The carboxylated graphene is added, and methyl methacrylate in methanol is added dropwise. The reaction is stirred at 20-30 degrees C for 6 to 24 hours. The solvent methanol and excess raw material methyl acrylate are removed at 50 degrees C to obtain a polyamide-amine dendrimer-graphene. 3-10 pts. wt. polyamide-amine dendrimer-graphene, 5-10 pts. wt. titanium dioxide, 10-15 pts. wt. talc, 20-30 pts. wt. isooctyl ester, 5-10 pts. wt. aluminum tripolyphosphate, 3-5 pts. wt. silica sol, 1.5 to 2.5 pts. wt. propylene glycol, 20-30 pts. wt. water are added to a sand mill for 120-240 minutes to obtain a graphene anticorrosive coating.