Study on Electret Technology of Air Filtration Material

Abstract

The air filter material of high efficiency and low resistance was prepared by electric field poling method. Through orthogonal experiment, the influences of process parameters on the electrets' surface potential and filtration efficiency were studied. The results showed that the most significant influence factor was the charging voltage, followed by charging speed and distance, and the temperature minimum. Besides, it was found that grid electrode could contribute to form uniform and stable surface charge. Twice poling treatment was conducive to obtain higher surface electrostatic potential and the filtration efficiency, and better storage of charge.