▎ 摘　　要

NOVELTY - Graphene water reducing agent, comprises isopentenol polyoxyethylene ether, pentaerythritol tetraacrylate, 2-acrylamide-1-methylpropanesulfonic acid, unsaturated phosphoric acid esters, graphene oxide, 3-mercaptopropionic acid, ascorbic acid and initiator. The unsaturated phosphate is 2-methyl-2-acrylic acid-2-hydroxyethyl phosphate, 9-octadecen-1-ol phosphate, dimethyl vinyl phosphate, allyl phosphate ethyl ester and/or triallyl phosphate. The initiator comprises potassium persulfate, ammonium persulfate, benzoyl peroxide, tert-butyl hydroperoxide and/or multiple mixtures. The mercapto-containing silane coupling agent is mercaptopropyltriethoxysilane. The amides containing unsaturated groups are N,N-methylenebisacrylamide, N-vinyl caprolactam, N-vinyl formamide, 2-methacrylamide, and/or N-(3-dimethylaminopropyl) methacrylamide. The surfactant comprises alcohol ether sodium sulfate, secondary alkyl sodium sulfonate and/or fatty acid methyl ester ethoxy late sodium sulfonate. USE - The graphene water reducing agent is useful as cement and concrete dispersant (claimed). ADVANTAGE - The agent: has excellent water reducing performance, slump retention, early strength and slow release performance; ensure the adaptability to cement and concrete; can store the growth of cement hydration products; improves the compressive strength, bending strength and morphology of cement; and realize the internal structure of cement mortar compact. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: a method for preparing the graphene water reducing agent; and a modified graphene.