棉针织物漂白中铜配合物催化降解木质素及其模型化合物

doi:10.13475/j.fzxb.20200903308

摘要/Abstract

摘要：

为提高棉针织物的漂白效率,深入研究其漂白机制,利用二价铜离子、亚氨基二乙酸和4-二甲氨基吡啶制备得到铜配合物催化剂,并构建了催化漂白体系,研究短时间内不同温度下催化漂白棉针织物白度值的变化。采用气相色谱-质谱联用仪检测分析铜配合物降解木质素及其模型化合物的中间产物和最终产物,推测其漂白机制。结果表明:在90 ℃条件下催化反应5 min,棉针织物的白度值约为78%,毛效值达到17.9 cm,强力保留率达到98%左右;木质素及其模型化合物均可被降解成芳香烃小分子,并进一步矿化为水和二氧化碳。漂白体系漂白过程中条件的改善可有效提高棉针织物加工的生产效率,漂白机制的研究可为改进漂白体系提供借鉴。

关键词: 漂白, 前处理, 催化漂白体系, 铜配合物, 木质素降解, 白度, 棉针织物

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

中图分类号:

TS192.5

刘丽宾, 吕汪洋, 陈文兴. 棉针织物漂白中铜配合物催化降解木质素及其模型化合物[J]. 纺织学报, 2021, 42(03): 1-8.

LIU Libin, LÜ Wangyang, CHEN Wenxing. Catalytic degradation of lignin and lignin model compound by copper complexes in bleaching cotton knitted fabrics[J]. Journal of Textile Research, 2021, 42(03): 1-8.

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漂白工艺	CIE白度/%		毛效(30 min)/cm		顶破强力/N
漂白工艺	5 min	50 min	5 min	50 min	顶破强力/N
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

产物名称	产物结构	峰面积
产物名称	产物结构	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

试样	质量浓度/(mg·L^-1)
试样	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