▎ 摘　　要

NOVELTY - An anti-corrosion coating comprises 100 parts mass component (A), and 20-40 parts mass component (B). The component (A) comprises 100 parts mass phenolic epoxy resin, 20-40 parts mass nano-toughened epoxy resin, 3-7 parts mass tung oil, 8-16 parts mass reactive diluent, 1-3 parts mass microcrystalline cellulose, 0.1-0.3 part mass defoamer, 0.3-0.9 part mass modified graphene, 0.2-1 parts mass leveling agent, 2-4 parts mass N-methyl-2-pyrrolidone, 4-8 parts mass polyoxyethylene nonylphenol ether, 5-7 parts mass mercaptobenzothiazole and 4-8 parts mass sodium alpha -alkenyl sulfonate. The component (B) comprises 100 parts mass diethylenetriamine, and 5-15 parts mass N-aminoethylpiperazine. USE - Anti-corrosion coating used for direct buried insulation pipe. ADVANTAGE - The coating provides insulation pipe having excellent high-temperature resistance, corrosion resistance, antistatic property and abrasion resistance, dustproof and self-cleaning ability and prolonged service life. The production time of the direct buried insulation pipe is reduced. The insulation pipe is prepared by economical method, and can resist the erosion of various chemical media during use. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) preparation of the coating, which involves stirring and mixing N-butyl glycidyl ether, methyl isobutyl ketone, nano titanium dioxide and stannous chloride in a mass ratio of 30:5:1-3:0.1-0.3, reacting at 135-145 degrees C for 2-4 hours, removing excess solvent to obtain modified nano titanium dioxide, adding epoxy resin, modified nano titanium dioxide and bisphenol A to the reaction kettle, mixing, adding one-third of sodium hydroxide to the reaction vessel, reacting at 150-160 degrees C for 30-40 minutes, adding one-third of sodium hydroxide, stirring evenly, heating to 160-170 degrees C to continue the reaction for 30-40 minutes, adding remaining one-third of sodium hydroxide and acetone to the reaction vessel, stirring, reacting at 170-220 degrees C for 120-180 minutes to obtain nano-toughened epoxy resin, adding 1 part mass graphene and 40-60 parts mass mixture of concentrated sulfuric acid and concentrated nitric acid to the container, stirring evenly, heating to 60-70 degrees C for 15-25 minutes, diluting with deionized water, filtering by suction filtered until the filtrate is neutral, drying to constant weight to obtain mixed acid modified graphene, adding 1 g mixed acid-modified graphene to container, adding 30-40 mL N,N-dimethylformamide, ultrasonically processing for 15-25 minutes, stirring, adding 80-90 mL dichlorosulfone, heating, stirring at 65-75 degrees C for 14-20 hours, cooling, filtering, and washing twice with N,N-dimethylformamide to remove excess dichlorosulfone on the surface, transferring the filter cake to 200 mL Erlenmeyer flask, adding 50-60 g ethanol and 15-25 mL triethylamine, heating to 50 degrees C, stirring and reacting for 24-30 hours, cooling, filtering, washing, drying, and pulverizing to obtain modified graphene, adding phenolic epoxy resin, nano-toughened epoxy resin, tung oil and reactive diluent to the container, and stirring uniformly to obtain an epoxy resin matrix solution, adding microcrystalline cellulose, mercaptobenzothiazole and sodium alpha -alkenylsulfonate to the epoxy resin matrix solution, and adding half of the mass of defoamer to stir at 2000-4000 rpm for 20 minutes, adding modified graphene, N-methyl-2-pyrrolidone and other half of the mass of the defoamer, stirring for 10-20 minutes, adding leveling agent and polyoxyethylene nonylphenol ether, and mixing to obtain component (A), adding diethylenetriamine and N-aminoethylpiperazine, mixing and removing bubbles to obtain the component (B). The mass ratio of epoxy resin, modified nano titanium dioxide, bisphenol A, sodium hydroxide and acetone is 100:2-6:10-16:0.5-1.3:4-8. The nano titanium dioxide has a particle size of 20-60 nm. The mass ratio of concentrated sulfuric acid and concentrated nitric acid is 3:1; and (2) construction of the coating for the direct buried heat preservation pipe, which involves weighing component (A) and component (B), heating component (A) to 40-50 degrees C, adding one-third of the component (B), stirring, reacting for 30-40 minutes, heating to 50-60 degrees C, adding one-third of component (B), stirring, reacting for 20-30 minutes, increasing the temperature of the system to 60-70 degrees C, adding the remaining three-thirds a component (B), stirring, reacting for 10-20 minutes to obtain a prepared anticorrosive treatment coating, spraying or brushing coating on the wall of the pre-buried direct-buried insulation pipe to ensure that the pipe wall is evenly sprayed or painted without leakage or leakage, controlling thickness of the coating to 0.1-0.2 mu m, continuing spraying or brushing the prepared anticorrosive coating to thickness of 0.2-0.4 mu m, when the coating is viscous and basically loses fluidity, repeating spraying.