靛蓝间接电化学还原染色性能研究

Indirect electrochemical reduction dyeing of indigo

针对靛蓝间接电化学还原染色过程中染色深度较差的问题,以Fe(Ⅱ)-DGS-Abal B协同络合体系作为氧化还原媒介,研究媒介质量浓度、外加电压、还原时间、阴极电极面积对靛蓝染色性能的影响,并探讨染色织物表面含铁量、表观形貌和染液可降解性。优化工艺条件为靛蓝3 g/L、硫酸亚铁14 g/L、葡萄糖酸钠10.5 g/L、Abal B 8.75 g/L、氢氧化钠35 g/L、外加电压12 V、还原时间40 min、阴极电极面积15 cm^2。在此工艺下,棉织物染色K/S值较传统染色工艺提高6.79%,且染色牢度与传统染色工艺基本一致;棉织物表面含铁量较低,杂质较少,电化学还原染色后染液较传统染色更容易生物、化学降解,具有明显的环保效益。

Aiming at the problem of poor dyeing depth in indirect electrochemical reduction dyeing of indigo, the effects of mass concentration of medium, applied voltage, reduction time and cathode electrode area on the dyeing performance of indigo were studied by using Fe(Ⅱ)-DGS-Abal B synergistic complexation system as redox medium. The surface iron content, apparent morphology and degradation of dyed fabric were also discussed. The optimized process conditions were as follows: indigo 3 g/L, ferrous sulfate 14 g/L, sodium gluconate 10.5 g/L, Abal B 8.75 g/L, sodium hydroxide 35 g/L, applied voltage 12 V, reduction time 40 min and cathode electrode area 15 cm^2. Under this process, the K/S value of cotton fabric was 6.79% higher than that of the traditional dyeing method, and the dyeing fastness was basically consistent with that of the traditional dyeing process. The surface of cotton fabric had less iron content and less impurities. The dye solution after electrochemical dyeing was easier to be biodegraded and chemically degraded than traditional dyeing, which had obvious environmental benefits.