Electret is the necessary guarantee of the efficiency of the mask filtration. If the proper electret is not used, the static electricity on the melt blown cloth is easy to escape. If the electrode is not applied, the mask may meet the N95 standard when it is newly made, but the filtering efficiency will become very low in a few months.
Electret materials are widely used in the field of high efficiency and low resistance air filter materials. Electret air filter materials require high density of stored charge, long life and high stability. The raw materials used as electrets need excellent dielectric properties, such as high volume resistance and surface resistance, high dielectric breakdown strength, low moisture absorption and air permeability.
TPD-532 is a kind of organic fluorine electret masterbatch based on polypropylene resin with ultra-high melt index, which can effectively improve the short-term storage capacity of melt blown PP nonwovens, and greatly improve the long-term stability of electrostatic charge after electret. Fluorine atom has strong electronegativity, the surface charge of fluorine-containing material is not easy to escape under the influence of external conditions.