▎ 摘　　要

NOVELTY - Preparing a flexible graphene-based composite film involves mixing graphene oxide and solvent by a cell crusher to obtain a dispersion A. The dispersion A is added with silver/carbon nanofiber composite material and magnetic ferroferric oxide, and is used in cell crusher to obtain a dispersion B. The sodium alginate solution is added to the dispersion B and then used in cell crusher to obtain a dispersion C. The dispersion C is subjected to vacuum filtering to obtain a composite film structure. USE - Method for preparing a flexible graphene-based composite film used as an electromagnetic shielding material (claimed). ADVANTAGE - The method enables to prepare a flexible graphene-based composite film, which has simple operation process, high efficiency and is suitable for industrial production and application. DETAILED DESCRIPTION - Preparing a flexible graphene-based composite film involves mixing graphene oxide and solvent by a cell crusher to obtain a dispersion A. The dispersion A is added with silver/carbon nanofiber composite material and magnetic ferroferric oxide, and is used in cell crusher to obtain a dispersion B. The sodium alginate solution is added to the dispersion B and then used in cell crusher to obtain a dispersion C. The dispersion C is subjected to vacuum filtering to obtain a composite film structure. The composite film structure is placed in a closed kettle filled with a low-boiling liquid reducing agent and subjected to steam reduction process to obtain final product.