Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (04): 15-20.doi: 10.13475/j.fzxb.20190706206

• Fiber Materials • Previous Articles     Next Articles

Structure and property of poly(vinyl alcohol-co-ethylene) nanofiber/polypropylene microfiber scaffold: a composite air filter with high filtration performance

WAN Yucai, LIU Ying, WANG Xu, YI Zhibing, LIU Ke(), WANG Dong   

  1. Hubei Key Laboratory of Advanced Textile Materials & Application, Wuhan Textile University, Wuhan, Hubei 430200, China
  • Received:2019-07-29 Revised:2020-01-13 Online:2020-04-15 Published:2020-04-27
  • Contact: LIU Ke E-mail:luecole@foxmail.com

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Abstract:

To enhance the filtration performance of fiber based air filtration materials, poly(vinyl alcohol-co-ethylene) (PVA-co-PE) nanofibers were prepared using the melt-blend-phase-separation method. The composite filter was obtained by immersing the polypropylene (PP) needle-punched nonwoven fabric into the aqueous phase-based PVA-co-PE nanofibers and freeze-dring them. The composite filters were characterized by Fourier transform infrared spectrometer, scanning electron microscope, electrostatic voltmeter, capillary flow poromete and filter tester. After the filtration test of NaCl nano-aerosol with the size of 0.3 μm, a best filtration performance was obtained with quality factor of 0.091 9 Pa-1, filtration efficiency of 99.936% and pressure drop of 81 Pa when basic density of nanofiber is 9.34 g/m2. The tensile strength and modulus of this composite filter both show about 1.5 times higher than that of PP needle-punched nonwoven fabric.

Key words: poly(vinyl alcohol-co-ethylene), polypropylene, freeze drying, composite filter, air filtration

CLC Number: 

  • TS176.9

Fig.1

Schematic diagram for preparation of PVA-co-PE composite filter"

Fig.2

SEM images of different filters. (a)Surface of PP needle-punched nonwoven fabric; (b)Surface of PVA-co-PE composite filter; (c)Sectional of PVA-co-PE composite filter"

Fig.3

Infrared spectra of PP needle-punched nonwoven fabric and PVA-co-PE composite filter"

Fig.4

SEM images of PP needle-punched nonwoven fabric (a) and PVA-co-PE composite filter (b) after filtration"

Fig.5

Filtration performance of PVA-co-PE composite filter with different basis density. (a)Filtration efficiency;(b)Quality factor"

Tab.1

Filtration performance of PP needle-punched nonwoven fabric and PVA-co-PE composite filter under different airflow velocity"

空气流量/
(L·min-1)		 过滤效率/%
PP针刺基材 PVA-co-PE复合过滤材料
32 54.296 99.936
50 39.672 99.925
85 27.990 99.916
100 20.519 99.892

Tab.2

Filtration performance of PP needle-punched nonwoven fabric and PVA-co-PE composite filter under different pretreatment conditions"

预处理方式 过滤效率/% 阻力压降/Pa 平均表面电位/V
PP针刺
基材		 PVA-co-PE
复合过滤材料		 PP针刺
基材		 PVA-co-PE
复合过滤材料		 PP针刺
基材		 PVA-co-PE
复合过滤材料
未处理 89.145 99.936 17 81 484 3
高湿度处理 80.848 98.752 17 83 390 3
高温处理 61.334 98.728 15 82 301 1
低温处理 54.674 98.717 14 84 283 3

Fig.6

Tensile stress-strain curves of PP needle-punched filter and PVA-co-PE composite filter"

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