▎ 摘　　要

NOVELTY - Preparation of graphene filler involves mixing natural starch and organic solvents, heating, adding sodium hydroxide to adjust pH value of mixture to weakly alkaline, adding epichlorohydrin, reacting, adding sodium hydroxide to adjust pH value of mixture to weakly alkaline to obtain crosslinked modified starch, adding certain amount of acetic anhydride, carrying out esterification reaction, filtering, dehydrating, washing, drying to obtain esterified modified starch, adding graphene and sodium stearate, homogenizing, freezing, gelatinizing and drying. USE - Preparation of graphene filler for high-grade coated paper. ADVANTAGE - The method enables simple preparation of graphene filler has high tensile strength and burst resistance. The graphene filler effectively improves retention rate, sizing effect, printing adaptability and shape stability of the coated paper. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for graphene filler prepared by the method.