Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (06): 79-84.doi: 10.13475/j.fzxb.20180704406

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Effect of oil removal on charging performance of needle-punched nonwoven filters

ZOU Zhiwei, QIAN Xiaoming(), QIAN Yao, ZHAO Baobao, DUO Yongchao   

  1. School of Textile Science and Engineering, Tianjin Polytechnic University, Tianjin 300387, China
  • Received:2018-07-18 Revised:2018-11-30 Online:2019-06-15 Published:2019-06-25
  • Contact: QIAN Xiaoming E-mail:qxm@tjpu.edu.cn

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Abstract:

In order to study the effect of the fiber surface oil on the charging performance of the needle-punched nonwoven materials, and improve the corona charging effect of the needle-punched nonwoven filter materials, polyester fiber was selected as raw material to prepare needle-punched nonwoven materials with different weights. The nonwoven materials were washed by detergent, sodium carbonate reagent and ethanol reagent to remove the oil on the fiber surface. The change of dielectric constant and volume specific resistance, as well as the corona charging effect and efficiency decay performance of the polyester nonwoven materials before and after washing was analyzed. The results show that the removal of the oil agent has a positive effect on the corona charging effect of the polyester needle-punched nonwoven material, and the charging performance of the nonwoven materials with oil removed has greatly improved. The difference of the charging filtration performance is more obvious when the weight is higher. After charging at -15 kV voltage for 1 min, the filtration efficiency of the needle-punched polyester nonwoven with the weight of 250 g/m2 increases from 42.6% to 57.8% after washing. The removal of the oil agent lengthens the period of electrostatic decay of the polyester needle-punched nonwoven material.

Key words: polyester, oil agent, charging, nonwoven material, electric decay property, filtration efficiency

CLC Number: 

  • TS176.4

Fig.1

Corona standing device schematic"

Tab.1

Basic performance of samples"

试样
编号		 面密度/
(g·m-2)		 厚度/mm 透气性/
(mm·s-1)		 孔隙率/
%		 过滤阻力/Pa 体积电阻率/(Ω·m)
洗涤前 洗涤后 洗涤前 洗涤后
1# 150 1.52 1 517.4 92.95 7.2 7.5 1.75×1012 6.14×1014
2# 170 1.63 1 348.2 92.55 7.8 8.3 1.82×1012 6.25×1014
3# 190 1.78 1 137.6 92.38 9.2 9.8 1.88×1012 6.36×1014
4# 250 2.01 668.6 91.12 15.9 16.5 1.95×1012 6.45×1014

Fig.2

SEM images of samples before(a)and after (b) oil removing(×1 000)"

Fig.3

Infrared spectra of samples before and after oil removing"

Fig.4

Dielectric properties of samples before and after oil removal"

Fig.5

Comparison of initial filtration efficiency before and after oil removing"

Fig.6

Filtration efficiency of charging samples before and after oil removing at different voltages"

Fig.7

Filtration efficiency odecay of all charging samples before (a) and after (b) oil removing"

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