Study on charge characteristic of melt-blown polypropylene electret fabric by hydrocharging technique

• Published in: Journal of electrostatics 2022-03, Vol.116, p.103683, Article 103683
• Main Authors: Wang, Zengyuan, Chen, Gangjin, Hong, Xianliang, Yu, Junyu, Zhang, Jianfeng, Ding, Yike, Lou, Qiwei, He, Hongsheng
• Format: Article
• Language: English
• Subjects: Charge characteristic; Electret; Hydrocharging; Melt-blown polypropylene fabric
• ISSN: 0304-3886; 1873-5738
• DOI: 10.1016/j.elstat.2022.103683

Melt-blown polypropylene electret fabric prepared by hydrocharging technique has excellent filtration performance. However, its filtration mechanism and charge characteristic have not been clarified yet. This paper reports some new investigating results. Its filtration efficiency is correlated to its trapped charge. To achieve high filtration performance, deionized water with high resistivity must be adopted; both water spray pressure and drying temperature need to be kept within a suitable range. The positive and negative charges coexist and exhibit the characteristic of electric double layer in the MBPP electret fabric. In addition, the surface potential is significantly lower than the corona charged electret fabric. •It is proved that the excellent filtration performance is correlated to the trapped charge in the hydrocharged MBPPEF.•It is reported that the hydrocharging processing conditions can influence the charge trapped performance in MBPPEF, which affects FE.•It is firstly found out that the positive and negative charges coexist in the hydrocharged MBPPEF.