▎ 摘　　要

NOVELTY - A polypyrrole coated graphene oxide cement-based composite material is prepared by preparing materials comprising bisphenol A type epoxy resin, glycol monobutyl ether, n-butanol, aqueous acrylic resin, triethanolamine, polyvinyl acetate, vinyl triethoxysilane, pure pyrrole, ferric trichloride, silicone quaternary ammonium salt, dimethyl silicone oil, oxidized graphene powder, silicate cement, absolute ethyl alcohol and deionized water; preparing graphene oxide dispersant; stirring graphene oxide dispersant and dispersed graphene oxide for 15-18 minutes to prepare graphene oxide suspension; preparing cement base material; preparing cement base material interface treatment agent; performing surface treatment of cement base material; and performing polymerization reaction. USE - Method for preparing polypyrrole coated graphene oxide cement-based composite material used in military or civil building. ADVANTAGE - The prepared composite material has excellent electromagnetic shielding performance. DETAILED DESCRIPTION - A polypyrrole coated graphene oxide cement-based composite material is prepared by (A) preparing materials comprising bisphenol A type epoxy resin, glycol monobutyl ether, n-butanol, aqueous acrylic resin, triethanolamine, polyvinyl acetate, vinyl triethoxysilane, pure pyrrole, ferric trichloride, silicone quaternary ammonium salt, dimethyl silicone oil, oxidized graphene powder, silicate cement, absolute ethyl alcohol and deionized water; (B) preparing graphene oxide dispersant; (C) stirring graphene oxide dispersant and dispersed graphene oxide for 15-18 minutes to prepare graphene oxide suspension; (D) preparing cement base material; (E) preparing cement base material interface treatment agent; (F) performing surface treatment of cement base material; (G) performing polymerization reaction; and (H) taking out concrete test block, washing by deionized water, washing with absolute ethanol, cleaning and drying to obtain polypyrrole coated graphene oxide cement-based composite material. The step (B) comprises stirring tetrasiloxane quat-ammonium salt, dimethyl silicone oil, and deionized water at ratio of 5:1:15 for 2-2.5 minutes, slowly adding water, continuously stirring mixture for 15-18 minutes, putting into machine, rotating at 3000-3500 revolutions/minute to emulsify for 15-18 minutes, and obtaining graphene oxide dispersant. The step (D) comprises mixing silicate cement and water, stirring for 2-3 minutes in stirrer, adding oxidized graphene suspension, stirring for 2-3 minutes, injecting into mold, demolding after curing for 12 hours, demolding, continuously maintaining for 28 days, and obtaining cement base material. The step (E) comprises stirring glycol monobutyl ether and n-butyl alcohol into mixed solvent, dissolving bisphenol A type epoxy resin in mixed solvent, dissolving aqueous acrylic resin, triethanolamine, and polyvinyl acetate, and putting mixture on emulsifying machine with rotating speed of 3000-3500 revolutions/minute to emulsify for 30-35 minutes to obtain cement base material interface treatment agent. The step (F) comprises curing cement base material, washing by water, removing surface dust, taking out drying for 6-8 hours at 60-70 degrees C, cooling to room temperature, and spraying cement base material surface with treatment agent. The step (G) comprises drying emulsion, soaking cement base material into 2- 2.2% vinyl triethoxysilane, taking out after 3-4 minutes, naturally drying at room temperature, dipping 0.7-0.9 mol/L pyrrole solution, taking out after 2-3 minutes, and putting into 0.35-0.45 mol/L ferric trichloride solution to perform polymerization reaction.