Hydrogel-based electromagnetic shielding composite film and preparation method thereof

The invention provides a hydrogel-based electromagnetic shielding composite membrane and a preparation method thereof.The method comprises the following steps that 1, the surface of filter paper is evenly coated with a cationic guar gum aqueous solution and then dried, and a compound A is obtained; 2, the surface of the compound A is coated with a mixed solution of anion modified nano cellulose and MXene, the mass ratio of the anion modified nano cellulose to the MXene in the mixed solution is (1-10): (1-100), and then drying is conducted to obtain a compound B; and step 3, soaking the compound B in a PDMS solution, and then curing. As the gelation process only depends on non-covalent bond action such as electrostatic interaction and the like, the process is very rapid and easy to operate, and the hydrogel-based electromagnetic shielding composite film with high conductivity, high electromagnetic shielding property, high flexibility and corrosion resistance is prepared. 本发明提供一种水凝胶基电磁屏蔽复合膜及其制备方法，所述方法包括如下步骤，步骤1