Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (02): 161-167.doi: 10.13475/j.fzxb.20200908807

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Preparation of self-crosslinking fluorinated polyacrylate emulsion and its application properties

CAI Lu(), KANG Jialiang, LÜ Cun, HE Xuemei   

  1. College of Textiles and Clothing, Yancheng Institute of Technology, Yancheng, Jiangsu 224051, China
  • Received:2020-09-30 Revised:2020-11-03 Online:2021-02-15 Published:2021-02-23

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Abstract:

In view of the risks of long-chain perfluoroalkyl compounds to the environment and human body, four types of self-crosslinking fluorinated polyacrylates with different crosslinking agent contents were prepared by emulsion polymerization in this research. The long-chain perfluoroalkyl compounds were replaced by using environmentally friendly perfluorohexyl ethyl acrylate as functional monomer and γ-methacryloxypropyltrimethoxysilane as the crosslinking agent. The structure and performance of the self-crosslinking fluorinated polyacrylate emulsions were analyzed using particle size tester, Zeta potential analyzer, Fourier transform infrared spectrum and thermo-gravimetric analysis, and the application performance of self-crosslinking fluorinated polyacrylate emulsions were investigated with on cotton fabrics as the application object. The results show that the addition of crosslinking agent works in improving the thermal stability of fluorinated polyacrylate.Self-crosslinking fluorinated polyacrylate forms a complete water-repellent film on the surface of cotton fabric, and its static contact angle reaches as high as 138.2°. As the content of the crosslinking agent is further increased, the static contact angle of the treated cotton fabric drops to 90.6°.When the amount of crosslinking agent is 1.68 g, the treated cotton fabric demonstrats good washability.

Key words: self-crosslinking, fluorinated polyacrylate, emulsion polymerization, water-repellent finishing, washing resistance, cotton fabric

CLC Number: 

  • TQ211

Fig.1

Synthetic route of self-crosslinking fluorinated polyacrylates"

Tab.1

Recipes for emulsion polymerization of self-crosslinking fluorinated polyacrylatesg"

样品名称 FA BA MMA KH-570
SFPA-0 6.00 12.00 3.00 0
SFPA-4 6.00 12.00 3.00 0.84
SFPA-8 6.00 12.00 3.00 1.68
SFPA-12 6.00 12.00 3.00 2.52

Tab.2

Particle size and Zeta potential of self- crosslinking fluorinated polyacrylates"

样品名称 乳液粒径/nm Zeta电位/mV
SFPA-0 86.0 -56.5
SFPA-4 98.0 -52.3
SFPA-8 101.5 -51.1
SFPA-12 191.8 -30.7

Fig.2

FT-IR spectra of self-crosslinking fluorinated polyacrylates with different crosslinking agent contents"

Fig.3

TG spectra of self-crosslinking fluorinated polyacrylates"

Fig.4

FT-IR spectra of cotton fabrics treated with self-crosslinking fluorinated polyacrylates"

Fig.5

SEM images of cotton fabrics untreated and treated with self-crosslinking fluorinated polyacrylates (×3 000). (a) Pristine cotton; (b) SFPA-0-cotton; (c) SFPA-4-cotton; (d) SFPA-8-cotton; (e) SFPA-12-cotton"

Fig.6

Effect of crosslinking agent contents on static water contact angles of treated cotton fabrics"

Fig.7

Effect of crosslinking agent contents on washability of treated cotton fabrics"

Fig.8

XPS spectra of cotton fabrics treated with self-crosslinking fluorinated polyacrylates. (a) Unwashed; (b) 25 times washing"

Tab.3

Fluorine contents of cotton fabrics treated with self-crosslinking fluorinated polyacrylates"

样品编号 洗涤情况 F元素含量/%
SFPA-0-棉 未洗涤 36.8
SFPA-8-棉 未洗涤 25.6
SFPA-0-棉 洗涤25次 13.1
SFPA-8-棉 洗涤25次 14.7
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