Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (10): 47-52.doi: 10.13475/j.fzxb.20201103205

• Fiber Materials • Previous Articles     Next Articles

Preparation and properties of polytetrafluoroethylene/phenylene sulfide needled felt modified by aramid nanofiber

LIU Qiangfei1,2,3, WU Shaohua1,2, YANG Jizhen1,2,3, ZHOU Rong1,2,3(), DONG Xianglin4, SONG Chuanbo4, SHEN Zhaoxu4   

  1. 1. College of Textile & Clothing, Qingdao University, Qingdao, Shandong 266071, China
    2. Industrial Research Institute of Nonwovens & Technical Textiles, Qingdao University, Qingdao, Shandong 266071, China
    3. Shangdong Center for Engineered Nonwovens, Qingdao, Shandong 266071, China
    3. Shandong Xingguo Xinli Environmental Protection Co.,Ltd., Zibo, Shandong 255000, China
  • Received:2020-11-13 Revised:2021-06-05 Online:2021-10-15 Published:2021-10-29
  • Contact: ZHOU Rong E-mail:rzhouqdu@126.com

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Abstract:

Novel aramid nanofiber dispersion with different mass fractions was utilized to coat and process traditional high temperature polytetrafluoroethylene/phenylene(PTFE/PPS) needle-punched filter felts to improve their filtration efficiency. The micro-structure, element composition, thermalstability, mechanical properties, pore size distribution, air permeability as well as filtration properties of as-prepared composite filter materials (PTFE/PPS/ANF) were systemically explored and investigated. The results showed that the as-processed needle-punched felts exhibit a micro-nano structure when the aramid nanofiber dispersion was poured onto the needle-punched felts. It was found that the thermal stability and mechanical properties of as-obtained micro-nano composite felts were comparable to the untreated needle-punched felts. Most importantly, the micro-nano composite felts PTFE/PPS/ANF presented obviously enhanced filtration efficiency but slightly increased filtration resistance in comparison with the untreated felts. For instance, the filtration efficiency of the micro-nano composite felts is increased by 37.9% when the particulate maters with the diameter of 1.25 μm were utilized for filtration test. This study demonstrated that the nano-micro structure of composite felts played a major role in the improvement of filtration efficiency, and novel high temperature filter felts with high efficiency and low resistance were successfully achieved.

Key words: aramid nanofibers dispersion, needle-punched filter felt, membrane effect, high filtering efficiency and low filtering resistance, filtration efficiency, polyterafluoroethylene, phenylene sulfide

CLC Number: 

  • TS174

Fig.1

Flow chart of preparation process of PTFE/PPS/ANF composite felt"

Fig.2

SEM images of PTFE/PPS/ANF needle-punched composite felt with different ANFs mass fractions"

Fig.3

Element distribution of needle felt before and after treatment with aramid nanofibers dispersion. (a)Carbon;(b)Oxygen;(c)Fluorine;(d)Sulfur; (e)Nitrogen;(f)Potassium"

Fig.4

TGA (a) and DTG (b) curves of PTFE/PPS/ANF needle-punched composite felt with different ANFs mass fractions"

Tab.1

Mechanical properties of different samples"

样品编号 弹性模量/MPa 拉伸应变/% 拉伸强度/MPa
M1 69.06±7 43.85±6.0 11.41±1.2
M2 67.15±4.0 42.15±4 11.52±1.5
M3 53.09±5 45.48±3.5 12.36±1.4
M4 51.77±8 38.17±4.8 14.66±2.1

Fig.5

Pore size distribution (a) and air permeability (b) of PTFE/PPS/ANF needle-punched composite felt with different ANFs mass fractions"

Fig.6

Filtration performance and evaluation of PTFE/PPS/ANF needle-punched composite felt with different ANFs mass fractions. (a)Overall filtration performance;(b)Partial filtration efficiency and resistance"

Fig.7

Quality factor of needle-punched composite felt"

Fig.8

SEM photos of PTFE/PPS/ANF needle-punched composite felt with different ANFs mass fractions"

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