Research on charge storage properties of polypropylene fiber electret filter

The electret filters made of polypropylene(PP) fiber were prepared by means of corona charging method.The effects of charging voltage,charging time,distance between electrodes as well as ambient humidity on the charge storage properties of PP fiber electret filter were evaluated,and the contributory degree of each factor was analyzed by orthogonal test.The results show that it is feasible to prepare PP fiber electret filter by using such corona charging method.The surface voltage increases with the charging voltage and charging time,but decreases with the ambient humidity and distance between electrodes.Retention ratio of surface voltage decreases with the increase of ambient humidity.Charging voltage has the most significant influence on surface voltage,followed by the ambient humidity.Charging time and distance between electrodes have the least effect.The optimum conditions are charging time of 30 min,distance between electrodes of 8 mm,charging voltage of 10 kV,and ambient humidity of 35%.