Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (03): 130-135.doi: 10.13475/j.fzxb.20200407206

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Preparation and performance of nano-silica modified water-based polyurethane waterproof and moisture-permeable coated fabrics

DING Zihan, QIU Hua()   

  1. Key Laboratory of Eco-Textiles(Jiangnan University), Ministry of Education, Wuxi, Jiangsu 214122, China
  • Received:2020-04-28 Revised:2020-12-21 Online:2021-03-15 Published:2021-03-17
  • Contact: QIU Hua E-mail:qiuhua@jiangnan.edu.cn

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Abstract:

In order to improve the water resistance of water-based polyurethane, R972 hydrophobic fumed nano-silica was used to blend and modify the water-based polyurethane, and a pure cotton knitted fabric was treated to improve the waterproof and moisture permeability of the fabric. The structure and morphology of nano-silica water-borne polyurethane coatings were characterized by infrared spectroscopy, scanning electron microscopy, and super depth-of-field microscope. The effect of nano-silica content on the waterproof and moisture-permeable properties of fabrics was investigated using the single factor analysis. The results show that hydrophobic fumed nano-silica demonstrates a good nano-effect in aqueous polyurethane systems, and its addition has no great effect on the structure of the aqueous polyurethane coating film. When the nano-silica content is 1.5%, the water absorption of the coating film decreased by 55.4%, the moisture permeability of the coated fabric increased by 54.7%, the hydrostatic pressure resistance and contact angle increased by 86% and 131.4% repectively, and its mechanical properties were also significantly improved.

Key words: nano-silica, water-based polyurethane, waterproof and moisture-permeable, cotton knitted fabric, coated fabric, functional textiles

CLC Number: 

  • TS195.5

Fig.1

FT-IR spectra of WPU film and SiO2 / WPU coating film"

Fig.2

SEM images of SiO2/WPU coating film with different SiO2 content(×2 000)"

Fig.3

Super depth microscope images of fabric before (a) and after (b) coating(×150)"

Tab.1

Effect of nano-silica content on water absorption of coating film and contact angle of coated fabric"

SiO2质量
分数/%		 吸水前
质量/g		 吸水后
质量/g		 吸水率/% 接触角/(°)
0 0.157 1 0.182 0 15.849 58.58
0.5 0.154 0 0.173 8 12.857 124.25
1.0 0.178 0 0.192 5 8.146 128.40
1.5 0.131 7 0.141 0 7.062 135.58
2.0 0.106 3 0.112 5 5.833 129.46
2.5 0.091 5 0.094 6 3.388 131.22

Fig.4

Effect of nano-silica content on hydrostatic pressure resistance of coated fabric"

Fig.5

Effect of nano-silica content on moisture permeability of coated fabric"

Fig.6

Effect of nano-silica content on breaking strength and elongation at break of coatings film"

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