Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (09): 108-113.doi: 10.13475/j.fzxb.20180904906

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Influence of nano-foam finishing on properties of aramid filter materials

MIAO Te1, ZHANG Ruquan1,2(), FENG Yang3   

  1. 1. School of Textile Science and Engineering, Wuhan Textile University, Wuhan, Hubei 430200, China
    2. Key Laboratory of Textile Fibers and Products, Ministry of Education, Wuhan Textile University, Wuhan, Hubei 430200, China
    3. Jiangsu Okay Environmental Technology Co., Ltd., Jingjiang, Jiangsu 214500, China
  • Received:2018-09-18 Revised:2019-02-20 Online:2019-09-15 Published:2019-09-23
  • Contact: ZHANG Ruquan E-mail:857723482@qq.com

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Abstract:

In order to improve the filtration efficiency of the aramid filter material, the polytetrafluoroethylene (PTFE) aqueous emulsion was used as the main raw material to conduct coating treatment on the surface of aramid filter material by foam coating method. The influence of foam coating on the structure, friction resistance, air permeability, pore size, hydrophobicity, acid and alkali resistance, and the filtration performance of the filter material were studied. The test results show that a dense film is formed on the surface of the filter after foamed coating. With the increase of the amount of ceramic powder, the foaming effect of the coating solution becomes better, and film formed on the surface of the filter material is denser. Besides, the friction resistance performance of filter material is improved as well as the air permeability slightly decreases. The coating treatment not only improves the acid and alkali resistance and ash removal performance of the filter material and prolonged its service life, but also reduces dust attachment. The filtration performance test shows that the filtration efficiency of the filter material after coating has a remarkable improvement, and the filtration efficiency for the particulate matter above 1 μm increases from 39.1% to 60%, and particulate matter above 10 μm is filtrated by 100%.

Key words: polytetrafluoroethylene emulsion, foam coating, high temperature resistant filter material, ceramic nanopowder, aramid fiber, filtration efficiency

CLC Number: 

  • TS174.3

Tab.1

Mass difference of aramid filter at different friction timesg"

过滤材料 0次 1 000次 2 000次 5 000次
未涂层 5.39 5.38 5.36 5.33
PTFE涂层 6.51 6.51 6.50 6.50
0.5%陶瓷粉涂层 6.88 6.88 6.87 6.87
1.0%陶瓷粉涂层 6.51 6.51 6.50 6.49

Fig.1

SEM images of aramid filter before and after coating(×500). (a)Uncoated aramid filter; (b) PTFE coating; (c) 0.5% ceramic powder coating; (d) 1.0% ceramic powder coating"

Fig.2

Infrared specta of aramid filter before and after coating"

Fig.3

Water repellent contact angles of different finishing samples. (a)Uncoated aramid filter; (b) PTFE coating;(c) 0.5% ceramic powder coating; (d) 1.0% ceramic powder coating"

Fig.4

Acid-repellent contact angles of different finishing samples. (a)Uncoated aramid filter; (b) PTFE coating;(c) 0.5% ceramic powder coating; (d) 1.0% ceramic powder coating"

Fig.5

Alkali-repellent contact angles of different finishing samples. (a)Uncoated aramid filter;(b) PTFE coating; (c) 0.5% ceramic powder coating; (d) 1.0% ceramic powder coating"

Tab.2

Air permeability of aramid filter before and after coatingmm/s"

过滤材料 正面透气量 透气量下降量
未涂层 485.4
PTFE涂层 350.2 135.2
0.5%陶瓷粉涂层 322.9 162.5
1.0%陶瓷粉涂层 316.5 168.9

Tab.3

Pore size test results before and after coatingμm"

过滤材料 最小孔径 最大孔径 平均孔径
未涂层 8.5 62.6 23.4
PTFE涂层 6.5 33.4 14.7
0.5%陶瓷粉涂层 5.8 33.0 13.3
1.0%陶瓷粉涂层 5.4 31.2 12.5

Fig.6

Filtration efficiency of filter materials for particles of different particle sizes"

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