▎ 摘　　要

NOVELTY - Modified epoxy resin comprises epoxy resin comprising an epoxy group, and polyethyleneimine, which is grafted to the epoxy resin via the epoxy group. USE - Modified epoxy resin used in epoxy resin emulsion, and graphene-doped epoxy resin emulsion of anticorrosive paint. ADVANTAGE - The modified epoxy resin effectively improve the thermal stability of the epoxy resin emulsion and solve the problem of demulsification in the process of thinning the anticorrosive coating. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) Method for producing modified epoxy resin, which involves dissolving the epoxy resin and the polyethyleneimine in a solvent to perform grafting reaction, where grafting reaction os carried out at a temperature of 60-100degrees Celsius, and time is 1-3 hours. (2) Epoxy resin emulsion, which comprises water and modified epoxy resin. (3) Graphene-doped epoxy resin emulsion, which comprises the epoxy resin emulsion, graphene and reduced graphene oxide. (4) Anticorrosive paint, which comprises component A and component B, where component A comprises film forming matrix, paint additive, pigment filler and water; and component B comprises curing agent, where film forming matrix is the modified epoxy resin, epoxy resin emulsion, or graphene-doped epoxy resin emulsion.