Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (05): 31-37.doi: 10.13475/j.fzxb.20200805707

• Fiber Materials • Previous Articles     Next Articles

Preparation and properties of expanded polytetrafluoroethylene membrane composites with high dust holding capacity for high efficiency air filtration

LIU Chaojun1,2, LIU Junjie1(), DING Yike2, MA Shaofeng2, ZHANG Xiuqin2, ZHANG Jianqing2   

  1. 1. Tianjin Key Laboratory of Indoor Air Environmental Quality Control, Tianjin University, Tianjin 300072, China
    2. Zhejiang Goldensea Environment Technology Co., Ltd., Shaoxing, Zhejiang 311817, China
  • Received:2020-08-12 Revised:2021-02-05 Online:2021-05-15 Published:2021-05-20
  • Contact: LIU Junjie E-mail:jjliu@tju.edu.cn

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Abstract:

In order to improve the dust holding capacity of expanded polytetrafluoroethylene (ePTFE) membrane, and expand the application of ePTFE membrane composite materials in the field of clean room purification, polypropylene (PP) melt blown filter material with different thickness, fiber diameter and electret treatment was used as dust holding layer for the preparation of ePTFE membrane composite. The dust holding performance and microstructure of the composite were analyzed. The results show that the dust holding capacity of the composites increases linearly with the increase of the dust layer thickness. When the dust layer thickness is 0.45 mm, the dust holding capacity of the composite reaches 6.37 g/m2, which is 266% higher than that of the ePTFE membrane. The dust holding capacity of the composite increases as the dust layer fiber diameter decreases. When the fiber diameter of the dust layer is 1.462 μm, the dust holding capacity of the composite increases to 7.96 g/m2, which is 357% higher than that of the ePTFE membrane. After electret treatment, when the fiber diameter of the dust layer is 3.611 μm, the dust holding capacity of the composite increases by 136% compared with that before electret treatment.

Key words: expanded polytetrafluoroethylene, glass fiber filter paper, polypropylene melt blown filter material, dust holding capacity, air filter

CLC Number: 

  • TB332

Tab.1

Performance parameters of ePTFE and glass fiber filter media"

材料 过滤效率/
%		 过滤阻力/
Pa		 厚度/
mm		 面密度/
(g·m-2)
ePTFE膜 99.984 146.98 0.43 83.0
玻璃纤维滤纸 99.976 276.53 0.53 76.0

Fig.1

Structure diagram of composite material"

Tab.2

Performance parameters of raw materials"

材料
序号		 样品厚度/
mm		 面密度/
(g·m-2)		 纤维直径/
μm		 过滤阻力/
Pa		 过滤效率/
%
1-1 0.43 83.0 — 146.98 99.984
1-2 0.53 76.0 — 276.53 99.976
2-1 0.15 9.2 2.297 10.58 13.877
2-2 0.21 15.1 2.297 14.52 17.668
2-3 0.31 21.6 2.297 20.00 25.574
2-4 0.45 28.8 2.297 31.23 36.475
3-1 0.46 28.8 1.462 42.83 51.157
3-2 0.45 28.8 2.297 31.23 36.475
3-3 0.45 29.8 2.875 22.43 24.103
3-4 0.46 29.8 3.611 15.13 15.173
3-5 0.47 27.8 5.552 5.60 5.772
4-1 0.43 28.8 1.462 41.35 99.998
4-2 0.42 28.8 2.297 35.80 99.988
4-3 0.43 29.8 2.875 23.13 99.848
4-4 0.43 29.8 3.611 15.33 98.443
4-5 0.44 27.8 5.552 6.75 89.530

Fig.2

Dust holding curves of ePTFE membrane and glass fiber filter paper"

Fig.3

SEM images of ePTFE membrane and glass fiber filter paper surface before and after dust holding (× 2 000). (a) ePTFE membrane; (b) Glass fiber filter paper; (c) ePTFE membrane dust; (d) Glass fiber filter paper dust"

Fig.4

Resistance growth rate curve of composite materials with different dust holding layer thickness."

Fig.5

Comparison of dust holding capacity of composite materials with different dust holding layer thicknesses"

Fig.6

SEM images of ePTFE membrane and dust holding layer surface after dust retention. (a) ePTFE membrane surface of A-2-1; (b) ePTFE membrane surface of A-2-4; (c) Surface of dust holding layer of A-2-1; (d) Surface of dust holding layer of A-2-4"

Fig.7

Resistance growth rate of composite materials with different dust holding layer fiber diameters"

Fig.8

Comparison of dust holding capacity of composite materials with different dust holding layer fiber diameters"

Fig.9

SEM images of ePTFE membrane and dust holding layer windward side and leeward side surface after dust retention. (a) ePTFE membrane surface of B-3-1; (b) Windward side surface of dust holding layer of B-3-1; (c) Leeward side surface of dust holding layer of B-3-1; (d) ePTFE membrane surface of B-3-5; (e) Windward side surface of dust holding layer of B-3-5; (f) Leeward side surface of dust holding layer of B-3-5"

Fig.10

Comparisons of dust holding capacity before and after electret treatment of composite materials with different dust holding layer fiber diameters"

Fig.11

SEM images of ePTFE membrane and dust holding windward side and leeward side after electret and dust retention. (a) ePTFE membrane surface of C-4-1; (b) Windward side surface of dust holding layer of C-4-1; (c) Leeward side surface of dust holding layer of C-4-1; (d) ePTFE membrane surface of C-4-5; (e) Windward side surface of dust holding layer of C-4-5; (f) Leeward side surface of dust holding layer of C-4-5"

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