Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (06): 15-21.doi: 10.13475/j.fzxb.20220101407

• Manufacture and Application of High Performance Flexible Textile Composites • Previous Articles     Next Articles

Structural design and application of wet-laid nonwovens for separating membrane support

SHI Lei, ZHANG Linwei, LIU Ya, XIA Lei, ZHUANG Xupin()   

  1. School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China
  • Received:2022-01-10 Revised:2022-03-07 Online:2022-06-15 Published:2022-07-15
  • Contact: ZHUANG Xupin E-mail:zhxupin@tiangong.edu.cn

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Abstract:

Fabric supports play an important role of the membrane forming, and have an significant influence on the structure and performance of the membrane. In order to obtain a support with the required structure, asymmetric structured wet-laid nonwoven fabrics containing dense and smooth layer and high-mechanical layer was prepared by using wet-laid process and hot-pressing technology for the systematic investigation on the influence of fiber composition on the structure and properties. The results show that the addition of ultra-fine fibers improves surface smoothness, reduces pore size, and improves the processability of the separation membrane. When the porosity and structural parameters of the support were increased, and the porous structure of polysulfone membranes was accordingly regulated by influencing the phase separation forming process of the separation membrane, with the finger-like pores gradually shorten to circular sponge-like cavity structure. The permeance and bovine serum albumi rejection of the polysulfone membranes were also improved, indicating a new research idea for the separation membrane supports.

Key words: separating membrane, support, wet-laid nonwoven fabric, asymmetric structure, ultra-fine fiber

CLC Number: 

  • TS174.8

Fig.1

Design strategy of asymmetric support"

Fig.2

SEM images of surface (a) and cross section (b) of PET sea island fiber, and surface morphology of ultra-fine PET fiber (c)"

Fig.3

SEM images of surface(a) and cross section(b) of asymmetric support"

Fig.4

Structure and performance of asymmetric support. (a) Porosity and pore size ;(b) Tortuosity and structural parameters; (c) Fracture strength and rate of elongation of different support; (d)Water contact angle"

Fig.5

SEM image and structure of PSF UF membrane"

Fig.6

SEM images of cross sections of PSF UF membranes supported by different support"

Fig.7

Comparison of fracture strength and rate of elongation(a), water flux and BSA rejection rate (b) of PSF UF membranes supported by different support"

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