Journal of Textile Research ›› 2025, Vol. 46 ›› Issue (08): 80-88.doi: 10.13475/j.fzxb.20241107101

• Textile Engineering • Previous Articles     Next Articles

Preparation of woven fabrics from polyvinyl chloride fiber and their composite film structures and properties

LI Han1, QIAN Jianhua1(), WENG Kexin1, WANG Ao1, DAI Hongxiang2, SHAN Jiangyin1   

  1. 1. College of Textile Science and Engineering (International Institute of Silk), Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
    2. Hangzhou Institute of Quality and Measurement Science, Hangzhou, Zhejiang 310018, China
  • Received:2024-11-27 Revised:2025-06-11 Online:2025-08-15 Published:2025-08-15
  • Contact: QIAN Jianhua E-mail:qianjianhua@zstu.edu.cn

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Abstract:

Objective In order to improve the mechanical properties and acid and alkali corrosion resistance of the separation membrane, polyvinyl chloride(PVC)/chlorinated polyvinyl chloride(CPVC) composite membrane with PVC mechanism mesh as the support layer was prepared. Membrane separation technology is widely used in petrochemical, biomedical, environmental protection, seawater desalination and other fields. Improving the mechanical properties and acid and alkali corrosion resistance of separation membranes would broaden the application range of separation membranes, improve the service life and save cost.

Method The polyvinyl chloride/chlorinated polyvinyl chloride flat sheet membrane was prepared by submerged phase separation method using PVC as raw material, CPVC as blended membrane material, N,N-dimethylacetamide (DMAc) as solvent, and polyethylene glycol (PEG) 2000 as pore-former. The melt spinning process parameters were optimized for the preparation of polyvinyl chloride fibers filament, which was then made into PVC woven fabric. A composite membrane with asymmetric characteristics was constructed using polyvinyl chloride/CPVC flat sheet membrane as hydrophilic layer, and polyvinyl chloride braid as support layer.

Results The test results show that PVC-W-P (laminating film with PVC woven fabric as support body) has a dense microporous filtration layer, and the surface layer is closely connected to the support layer, forming a mechanical interlocking structure that enhances the interfacial bonding force, and the PVC support layer is successfully bonded to the bottom of the composite membrane. The surface roughness of the composite membrane increased, and the surface hydrophilicity improved. The water contact angle was reduced to 50°, the pure water flux was increased by 1.5 times, and the protein retention rate was increased by 4.6%. Under the condition of 6.25 mol/L NaOH and 2.55 mol/L H2SO4 solution treatment for 96 h, the mass loss rate of PVC fiber filament was more than 1% point, and the loss of breaking strength was 17% for 72 h. The PVC fibers were only partially hydrolyzed or degraded, and still retained most of the structural integrity. The breaking strength of PVC-W-P (laminating film with PVC woven fabric as support body) combined with PVC mechanism mesh was 17.6 times of that of PVC/CPVC-P (membranes without binding support bodies), and it was corroded by 2.55 mol/L H2SO4 and 6.25 mol/L NaOH solution for 72 h. Its breaking strength was 15.1 times and 15.6 times of that of PVC/CPVC-P (membranes without binding support bodies), respectively, and the PVC/CPVC-P after acid and alkali treatment had a retention rate decreased less. Comprehensively analyzing the influence of PVC/CPVC-P on the performance of PVC-W-P, the corrosion resistance to acid and alkali is greatly improved, and the composite membrane still has a greater strength after treatment with different concentrations of acid and alkali.

Conclusion PVC-W-P based on PVC woven mesh exhibits strong interfacial bonding, which significantly improves the hydrophilicity, mechanical properties and acid and alkali corrosion resistance of the composite membrane. Under acid and alkali conditions, PVC-W-P still maintains excellent mechanical properties and good filtration performance, which extends the service life of the composite membrane. This study provides a theoretical basis and reference for the preparation of composite membrane supports with excellent performance.

Key words: hydrophilicity, corrosion resistance, support layer, composite membrane, polyvinyl chloride, chlorinated polyvinyl chloride, filter material

CLC Number: 

  • TQ051.893

Fig.1

Flow chart of composite membrane preparation"

Fig.2

Effect of acid and alkali solutions on weight of PVC filament at different treatment times"

Fig.3

Effect of acid and alkali solutions on strength of PVC filament at different treatment times"

Fig.4

Surface and cross-section SEM images of different composite membranes"

Tab.1

Surface roughness of composite membranes with different membrane supports"

试样编号 Ra/nm Rq/nm
PVC/CPVC-P 4.84 6.12
PVC-W-P 12.10 16.50
PET-W-P 17.20 29.10
PP-M-P 8.47 12.30
PET-S-P 10.90 14.30

Fig.5

AFM three-dimesional images of composite membranes"

Tab.2

Changes in mechanical properties before and after lamination of different support bodies"

试样编号 断裂强力/N 断裂伸长率/%
复合前 复合后 复合前 复合后
PVC/CPVC-P 12.2 — 28.5 —
PVC-W 192.3 215.1 32.0 30.9
PET-W 205.0 236.2 30.5 18.5
PP-M 4.8 18.6 14.5 12.1
PET-S 15.4 40.6 18.0 12.5

Tab.3

Changes in mechanical properties after acid or alkali treatment of composite membranes with different supports"

试样编号 酸处理后 碱处理后
断裂强
力/N		 断裂伸长
率/%		 断裂强
力/%		 断裂伸长
率%
PVC/CPVC-P 10.8 11.8 9.6 12.1
PVC-W-P 190.2 26.4 183.7 23.2
PET-W-P 13.4 7.9 12.5 5.0
PP-M-P 13.9 11.5 10.8 12.0
PET-S-P 33.6 18.5 31.8 15.5

Fig.6

Effect of different molar concentrations of H2SO4 on mechanical properties of PVC composite films"

Fig.7

Effect of different molar concentrations of NaOH on mechanical properties of PVC composite films"

Tab.4

Porosity and water contact angle of composite membranes"

试样编号 孔隙
率/%		 水接触
角/(°)		 酸处理后
水接触
角/(°)		 碱处理后
水接触
角/(°)
PVC-CPVC-P 22.6 66.3 65.5 64.1
PVC-W-P 38.8 50.0 48.2 46.2
PET-W-P 35.6 61.0 57.1 55.1
PP-M-P 28.9 62.5 58.2 57.3
PET-S-P 33.9 57.1 53.8 52.1

Tab.5

Composite membrane water flux and retention rate"

试样编号 水通量/(L·m-2·h-1) 截留率/%
未处理 酸处理后 碱处理后 未处理 酸处理后 碱处理后
PVC-CPVC-P 86 99 116 74 73.0 71.2
PVC-W-P 145 151 153 78 77.2 76.3
PET-W-P 136 157 162 80 72.1 70.5
PP-M-P 124 135 140 82 79.1 75.7
PET-S-P 141 149 156 75 72.8 71.0
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