▎ 摘　　要

NOVELTY - A graphene-containing aqueous polyurethane composite conductive coating is prepared by adding graphite powder and sodium nitrate in concentrated sulfuric acid, stirring, slowly adding potassium permanganate, quickly stirring, transferring mixture at warm water bath, continuously stirring, slowly adding distilled water, controlling temperature, cooling, adding potassium permanganate, adding distilled water, hot-filtering, washing filtrate, calcining, adding obtained graphite oxide to dimethylformamide solution, regulating pH, adding organic diamine, and ultrasonically processing. USE - In situ preparation of graphene-containing aqueous polyurethane composite conductive coating for polymer material, metal material, and textile material. ADVANTAGE - The preparation is simple, has low cost, convenient construction, and obtains product which has better storage ability and is environment-friendly, radiation-proof, antistatic, anti-corrosive, and wear-resistant. DETAILED DESCRIPTION - A graphene-containing aqueous polyurethane composite conductive coating is prepared by adding 2-5 g graphite powder and 1-2 g sodium nitrate in 46-60 ml 98 mass% concentrated sulfuric acid, stirring under ice bath for 30-60 minutes, slowly adding 6-15 g potassium permanganate at 0-5 degrees C, quickly stirring for 2-5 hours, transferring mixture at 35 degrees C warm water bath, continuously stirring for 3-6 hours, slowly adding 90-150 ml distilled water, controlling temperature at 98 degrees C for 30-60 minutes, cooling to room temperature, adding 30 mass% potassium permanganate to remove excess hydrogen peroxide until mixture is bright yellow, adding 150-300 ml distilled water to dilute, hot-filtering, washing filtrate with 0.01 mol/L hydrochloric acid, anhydrous ethanol, and deionized water sequentially until sulfate ion is removed in neutral solution, calcining at 60 degrees C to obtain yellow graphite oxide, adding 0.1-0.2 g obtained graphite oxide to 100-200 ml dimethylformamide solution, regulating pH to 7-9 using 28 mass% ammonia water, adding 0.1-0.2 g organic diamine, ultrasonically processing at 40 kHz low frequency for 1-3 hours to obtain graphene oxide solution, dropwise adding 1-10 drops of dicyclohexyl carbodiimide, stirring at 60-75 degrees C for 1-5 hours, adding 0.1-0.2 g reducing agent at 70-100 degrees C, reacting for 1-10 hours, washing, vacuum-drying to obtain amine-modified graphene black powder, mixing polymer polyol and polyisocyanate under nitrogen protection at 50-100 degrees C for 2-5 hours in which molar ratio polymer polyol:polyisocyanate is 1:2-3, adding hydrophilic chain extender which is 3-7 mass% of total aqueous polyurethane prepolymer mass at 50-100 degrees C, reacting for 1-2 hours, dropwise adding 1-5 drops dibutyl tin dilaurate, reacting at 50-100 degrees C for 2-3 hours, adding acetone which is 2 times mass polymer polyol to adjust polymer viscosity and obtain aqueous polyurethane prepolymer with terminated isocyanate group (-NCO), cooling prepolymer at 0-5 degrees C ice water bath, adding 0.5-5 mass% amine-modified graphene black powder, high-speed stirring for 0.5-1 hour, displacing reactant in emulsifying container, adding neutralizing agent which is 0.5-2 times mass of aqueous polyurethane prepolymer and chain extender which is 1-2 mass% of aqueous polyurethane mass in which molar ratio neutralizing agent:chain extender is 0.8-1.2:1, high speed stirring at normal temperature for 1.5-10 hours, and decompression distilling to remove acetone in liquid. DESCRIPTION OF DRAWING(S) - The drawing shows a drying and film forming effect graph of graphene-containing aqueous polyurethane composite conductive coating.