▎ 摘　　要

NOVELTY - The method comprises mixing graphene slurry with ferric oxide to obtain mixture, spray-drying mixture to obtain composite material, and grinding composite material. The graphene slurry is prepared by using electrochemical method. USE - Preparation method of electromagnetic shielding material used for coating. ADVANTAGE - The method is simple, easy to realize industrial batch preparation, and has obvious economical efficiency. The method uses electrochemical preparation to obtain the graphene large sheet diameter and high specific surface area, especially, graphene also has proper functionalization, surface compounding with ferric oxide, on the one hand, the functional group of the graphene surface on one hand and ferric oxides particles have interaction, which is good for uniformly dispersing ferrous oxide particles on the graphene surfaces. The iron oxide is carried on the large sheet layer, graphene sheet are not easy to generate agglomeration, and the graphene sheet is easy to form impedance matching between the two iron oxides, so as to generate polarizability, synergistically enhance the ability of attenuating electromagnetic wave. DESCRIPTION OF DRAWING(S) - The drawing shows an electromagnetic wave absorption performance test chart of electromagnetic shielding material under different coating thicknesses.