The electret of the electret masterbatch refers to a dielectric material that has the function of storing charges for a long time and releasing negative ions. The stored charge can be a unipolar real charge (space charge) injected from the outside, or a dipole in a polar dielectric Dipole charges formed by sub-ordered orientation, or both types of charges. Increase the electrostatic adsorption and negative ion sterilization capabilities of the mask to effectively block droplets, dust, viruses, etc. below micrometers.