▎ 摘　　要

NOVELTY - Multi-layer composite graphene electromagnetic shielding material includes a fabric substrate, where the fabric substrate is sequentially covered with a carbon-based shielding layer and an aqueous polyurethane cured layer from bottom to top. The carbon-based shielding layer is a carbon nanotube layer formed by stacking with graphene layers or formed by a mixture of carbon nanotubes and graphene. USE - Multi-layer composite graphene electromagnetic shielding material. ADVANTAGE - The multi-layer composite graphene electromagnetic shielding material has longitudinal conductivity and a three-dimensional conductive network, ultra-high level of electrical conductivity, greatly enhanced electromagnetic shielding effectiveness of the material, and both electromagnetic shielding effectiveness and heat conduction and heat dissipation. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing multi-layer composite graphene electromagnetic shielding material, which involves: (A) configuring water-based carbon nanotube slurry A, water-based carbon nanotube slurry B, and high-quality thin-layer graphene water-based slurry loaded with nano iron (III) oxide particles; (B) suction filtering the carbon nanotube water-based slurry A, the high-quality thin-layer graphene water-based slurry and the carbon nanotube water-based slurry B on the fabric substrate in sequence or after mixing to form a carbon-based shielding layer; (C) drying at 60 degrees C for 3-5 hours; (D) prepare a water-based polyurethane diluent; (E) coat on the carbon-based shielding layer; and (F) forming water-based polyurethane cured layer after curing to obtain the finished product.