Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (01): 91-96.doi: 10.13475/j.fzxb.20180201206

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Application of copper complex in low-temperature neutral bleaching of cotton knitted fabrics

WU Chenren, LÜ Wangyang(), CHEN Wenxing   

  1. National Engineering Laboratory for Textile Fiber Materials & Processing Technology, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
  • Received:2018-02-15 Revised:2018-08-08 Online:2019-01-15 Published:2019-01-18
  • Contact: Lü Wangyang E-mail:luwy@zstu.edu.cn

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Abstract:

For the excessive energy consumption in the conventional high temperature bleaching processes of cotton fabrics, a copper complex with iminodiacetic acid, bivalent copper ions and pyridine derivatives was used as the catalyst for hydrogen peroxide low temperature bleaching to construct a novel low temperature cotton knitted fabric bleaching system. The effects of temperature, concentration of complex, bleaching time, mass concentration of sodium hydroxide and concentration of hydrogen peroxide mass of on bleaching effect of cotton knitted fabric were discussed. At the same time, the degradation process of p-coumaric acid as the model compound of lignin was studied and the mechanism of catalytic bleaching of cotton knitted fabric in the presence of copper complex catalyst was proposed. By single factor test, the final optimized bleaching process was determined as follows: metal complex of 30 μmol/L, 30% H2O2 of 10 g/L, penetrant agent of 2 g/L, scouring agent of 2 g/L, liquor ratio of 1∶30, and bleaching at 60 ℃ for 60 min. Under the neutral condition, the whiteness of the treated fabric can reach 75.03%, and the bursting strength loss is smaller.

Key words: metal complex, hydrogen peroxide, low-temperature bleaching, cotton knitted fabric

CLC Number: 

  • TS192.5

Fig.1

Synthesis route of IDA/Cu(II)/4-ampy"

Tab.1

Effect of NaOH concentration on whiteness index of fabric"

氢氧化钠质量
浓度/(g·L-1)		 CIE白度/% 氢氧化钠质量
浓度/(g·L-1)		 CIE白度/%
0 75.73 3 70.94
1 69.17 4 71.08
2 70.88

Fig.2

Effect of H2O2 concentration on whiteness index of fabric"

Fig.3

Effect of complex concentration on whiteness index of fabric"

Fig.4

Effect of bleaching temperature on whiteness index of fabric"

Fig.5

Effect of bleaching time on whiteness index of fabric"

Tab.2

Results of low temperature bleaching experiments"

试样 CIE白度/% 润湿性/s 顶破强力/N
精练布 25.21 小于1.0 342.22
对照组试样 31.03 小于1.0 310.14
低温优化工艺试样 75.03 小于1.0 302.48

Fig.6

Oxidation effect of complex on p-coumaric acid"

Fig.7

High-definition mass spectra analysis of metal complex(a) and high valence-copper-reactive species(b)"

Fig.8

Catalytic mechanism of IDA/Cu(II)/4-ampy complex"

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