▎ 摘　　要

NOVELTY - Graphene composite powder material comprises graphene material and micro-nano structure material attached to surface of the graphene material. USE - Used as graphene composite powder material. ADVANTAGE - The powder material has good dispersibility and is free from agglomeration. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the graphene composite powder material, comprising (i) adding second polymer, graphene material and micro-nano structure material into water to obtain mixed solution, where the mass ratio of the graphene material and the second polymer is 1:0.01-1:100 and the mass ratio of the micro-nano structure material and graphene material is 0.1:1-5:1, and (ii) drying to obtain the graphene composite powder material; or (i) adding first polymer monomer, graphene material and micro-nano structure material of mass ratio (0.01-1):(0.1-1):(5-1) into water to obtain mixed solution and (ii) adding water-soluble initiator, reacting at 30-100 degrees C for 1-10 hours, where the mass ratio of water-soluble initiator and first polymer monomer is 1:10-1:100, and drying; or (i) stirring and reacting micro-nano structure material and organic amine compound at 40-100 degrees C for 2-6 hours, filtering and drying to obtain modified micro-nano structure material, where the mass ratio of organic amine compound and micro-nano structure material is 10:1-100:1, (ii) mixing water and ethyl alcohol to obtain aqueous ethyl alcohol solution, adding aromatic group containing silane coupling agent to form first solution, where the mass ratio of water and ethyl alcohol is 1:5-1:8, and the mass ratio of aromatic group containing silane coupling agent and aqueous ethyl alcohol solution is 1:1-10:1, (iii) taking aqueous solution of graphene-containing material, adding into the first solution, stirring and reacting at 40-100 degrees C for 1-3 hours to obtain modified graphene material containing mixed solution, where the amount of graphene material in aqueous solution of graphene-containing material is 0.5-3%, and the mass ratio of graphene material and silane coupling agent is 5:1-20:1, and (iv) adding micro-nano structure material into modified graphene material containing mixed solution, reacting, filtering and drying, where the micro-nano structure material is attached to the surface of the modified graphene material.