▎ 摘　　要

NOVELTY - Preparation of electromagnetic shielding film involves (1) mixing polytetrafluoroethylene, silane coupling agent, sodium carboxymethyl cellulose, graphene, styrene-butadiene rubber, lignin, silica sol and alcohol solution to prepare a film liquid, (2) using the substrate as the film substrate, and immersing the substrate in the film liquid prepared in step (1), (3) carrying out hot-air drying and shaping of the substrate, and (4) carrying out a smooth roll hot pressing treatment on the shaped substrate to obtain a film. USE - Preparation of high electromagnetic shielding film (claimed). ADVANTAGE - The prepared film has excellent electromagnetic shielding ability.