▎ 摘　　要

NOVELTY - Three-layer absorbing composite material comprises top layer, middle layer and bottom layer. The top layer comprises reduced graphene oxide and thermoplastic polyolefin. The middle layer comprises iron oxide (Fe3O4)-reduced graphene oxide composite filler and thermoplastic polyolefin. The Fe3O4-reduced graphene oxide composite filler is supported on surface of reduced graphene oxide, and bottom layer has Fe3O4 and thermoplastic polyolefin. USE - Three-layer absorbing composite material used in electromagnetic wave absorption (claimed). ADVANTAGE - The three-layer absorbing composite material enables to show remarkable waterproof performance, high elasticity and easy processing performance, and improves absorbing effect. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing three-layer absorbing composite material, which involves: (A) mixing reduced graphene oxide with thermoplastic polyolefin, granulating, and hot-pressing, which are successively carried out to obtain prefabricated top sheet; (B) mixing Fe3O4, reduced graphene oxide, and ethanol, performing solid-liquid separation, and drying are carried out in sequence to obtain Fe3O4-reduced graphene oxide composite filler; (C) mixing Fe3O4-reduced graphene oxide composite filler, and thermoplastic polyolefin, then granulating, hot-pressing to obtain prefabricated intermediate layer board; (D) mixing Fe3O4 with thermoplastic polyolefin, then pelletizing, and hot-pressing in sequence to obtain prefabricated bottom board; and (E) stacking prefabricated bottom board, middle layer board, top board sequentially, and then formed by hot pressing to obtain three-layer wave absorbing composite material.