Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (09): 52-58.doi: 10.13475/j.fzxb.20201101007

• Fiber Materials • Previous Articles     Next Articles

Characteristics of charge capture of melt-blown polypropylene electret nonwovens by corona charging

GAO Meng, WANG Zengyuan, LOU Qiwei, CHEN Gangjin()   

  1. Laboratory of Electret and Its Application, Hangzhou Dianzi University, Hangzhou, Zhejiang 310018, China
  • Received:2020-11-06 Revised:2021-06-04 Online:2021-09-15 Published:2021-09-27
  • Contact: CHEN Gangjin E-mail:cgjin@hdu.edu.cn

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Abstract:

Aiming at the differences in the filtering performance of melt-blown polypropylene (MBPP) electret nonwovens obtained under different charging conditions and the applied environment influence on their charge storage stability, correlation between the charging conditions and the charge storage performance of the MBPP electret nonwovens was investigated based on the thermally stimulated discharge technology and measurement of surface potential distribution. The influence of water and alcohol fumigation on the charge storage stability was studied. The experimental results show that the energy levels of positive and negative charge trap are similar, but the filtering performance of the positive corona charging nonwoven is better than that of the negative corona charging. The surface potential values are not able to reflect accurately the quality of their filter performance. The filter efficiency of the nonwovens attenuates a little after water fumigation, and it attenuates a lot after alcohol fumigation, to the same the level as that without charging. This research provided a basis for the production and application of MBPP electret nonwovens under high humidity and medical environments.

Key words: melt-blown polypropylene electret nonwoven, corona charging, thermally stimulated discharging, charge stability

CLC Number: 

  • TQ31

Tab.1

Charge condition parameters"

驻极距离/cm 驻极电压/kV 驻极温度/℃ 驻极时间/s
4~18 ±30 26 30
4 ±12~±30 26 30
4 ±30 26~110 30
4 ±30 26 10~60

Fig.1

Correlation of filtration efficiency to charging parameters for MBPP electrets nonwovens. (a)Charge distance;(b)Charge voltage;(c)Charge temperature;(d)Charge time"

Fig.2

Surface potential distribution of MBPP electrets nonwovens t charged with different charge voltages"

Fig.3

TSD spectra of MBPP electrets nonwovens charged with different voltages"

Fig.4

Surface potential distribution of MBPP electrets nonwovens fumigated with alcohol and water. (a)+30 kV charging by alcohol fumigation;(b)-30 kV charging by alcohol fumigation; (c)+30 kV charging by water fumigation;(d)-30 kV charging by water fumigation"

Fig.5

Thermally stimulating discharging spectra of MBPP electrets nonwovens fumigated with alcohol and water"

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