Self-Healing Electromagnetic Interference Shielding Material with Low Reflection Characteristic

Abstract

With the development of communication technology, electromagnetic wave pollution is becoming more and more serious, and electromagnetic interference shielding materials with high performance are needed. In our work, a flexible self-healing electromagnetic wave absorbing material was obtained. Firstly, hollow structure Fe3O4 was prepared by hydrothermal method, and then we introduced “-NH2” onto it, the Fe3O4@SiO2-NH2 was prepared, and the amino content is 0.58 mmol/g. Then we prepared PU-Fe3O4@SiO2-NH2 by grafting Fe3O4@SiO2-NH2 onto PU, the Fe3O4@SiO2-NH2 will not sink down within 24 hours. The maximum self-healing efficiency of PU-Fe3O4@SiO2-NH2 is 88%. Added 20wt% Ag@CF conductive filler into PU-Fe3O4@SiO2-NH2, the self-healing electromagnetic interference shielding material was obtained. The materials obtained effective electromagnetic interference shielding and shield electromagnetic interference waves mainly by absorbing.

Keywords: electromagnetic interference shielding, Fe3O4, polyurethane, self-healing, electromagnetic waves absorbing materials