Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (03): 1-8.doi: 10.13475/j.fzxb.20200903308

• Invited Column:Full-process Open Width Printing and Dyeing Technology for Knitted Fabric •     Next Articles

Catalytic degradation of lignin and lignin model compound by copper complexes in bleaching cotton knitted fabrics

LIU Libin, LÜ Wangyang(), CHEN Wenxing   

  1. National Engineering Laboratory for Textile Fiber Materials & Processing Technology, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
  • Received:2020-09-15 Revised:2020-12-21 Online:2021-03-15 Published:2021-03-17
  • Contact: Lü Wangyang E-mail:luwy@zstu.edu.cn

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Abstract:

In order to improve the bleaching efficiency of cotton knitted fabrics and to further understand the bleaching mechanisms, divalent copper ions, iminodiacetic acid and 4-dimethylaminopyridine were utilized to prepare a copper complex catalyst. A bleaching system was constructed to study the change of whiteness of catalyst bleached cotton knitted fabric under different temperatures in a short time. Gas chromatography-mass spectrometry was used to analyze the degradation of lignin and lignin model compound in the intermediate and final products, and to study the bleaching mechanism. The results show that after reacting for 5 minutes at 90 ℃, the whiteness value of the cotton knitted fabric reaches about 78%, the capillary effect can goes to 17.9 cm, and the strength retention rate of the fabric is about 98%. Both lignin and its model compound can be degraded into aromatic hydrocarbon molecules and further mineralized into water and carbon dioxide. The improvement of conditions used in the bleaching process using the bleaching system can effectively improve the bleaching efficiency of cotton knitted fabrics and the research findings on the bleaching mechanism provide reference for improving the bleaching system.

Key words: bleaching, pre-treatment, catalytic bleaching system, copper complex, lignin degradation, whiteness, cotton knitted fabric

CLC Number: 

  • TS192.5

Fig.1

Changes of whiteness after 5 min bleaching under different temperature conditions"

Fig.2

Change of whiteness before and after adding catalyst at 90 ℃"

Tab.1

Comparison of bleaching effects of catalytic bleaching process and high temperature alkali oxygen process"

漂白工艺 CIE白度/% 毛效(30 min)/cm 顶破强力/N
5 min 50 min 5 min 50 min
未处理 0 0 0 0 690.53±15.40
催化漂白工艺 78.77 88.10 17.90 19.80 680.70±7.30
高温碱氧工艺 63.93 75.34 2.80 16.80 436.20±8.70

Fig.3

Effect of pH values on degradation of lignin"

Fig.4

Effect of H2O2 concentration on degradation of lignin"

Fig.5

Effect of catalyst concentration on degradation of lignin"

Fig.6

Color change of lignin solution"

Tab.2

Changes of main intermediate products of lignin at different degradation times"

产物名称 产物结构 峰面积
0 min 30 min 60 min
4-羟基苯甲醛 0 1.66×106 0
4-羟基-3-甲氧基苯甲醛 0.14×107 1.37×107 0
1-(4-羟基-3-甲氧基苯基)乙-1-酮 0 5.06×105 0
4-羟基-3-甲氧基苯甲酸 0 1.66×106 0
4-羟基-3,5-二甲氧基苯甲醛 1.15×106 3.91×106 0
1-(4-羟基-3,5-二甲氧基苯基)乙-1-酮 1.45×106 2.75×106 0

Tab.3

Analysis of carbon content of lignin solution"

试样 质量浓度/(mg·L-1)
总无机碳 总有机碳 总碳
水溶液 0.98 5.32 6.30
木质素溶液降解0 min 16.13 37.70 53.83
木质素溶液降解60 min 14.54 19.44 33.98

Fig.7

Conjecture on degradation process of lignin model compound"

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