Preparation method of ultralight high-elasticity aerogel for electromagnetic shielding

The invention belongs to the technical field of electromagnetic shielding composite materials, and particularly relates to a preparation method of ultralight high-elastic aerogel for electromagnetic shielding, which comprises the following steps: dissolving PBO (poly (p-phenylenebenzobisoxazole)) fibers in a solvent with suitable mixed acid to prepare PBONF sol with the mass fraction of 0.01-0.1 wt%, combining branched chain polyethyleneimine modified Mxene with the PBONF sol, and carrying out ultrasonic treatment to uniformly disperse the Mxene and the PBONF sol to obtain the ultralight high-elastic aerogel for electromagnetic shielding. The ultra-light high-elasticity aerogel for electromagnetic shielding is prepared by adopting a directional freezing mode and finally performing freeze drying, heat treatment and chemical crosslinking, the method has the advantages of being simple and easy to operate, mild in reaction condition and the like, and the ultra-light high-elasticity Mxene/PBO nanofiber composite a