原棉纤维的活性染料无盐染色

Salt-free dyeing of grey cotton fibers using reactive dyes

含盐量高是纤维素纤维印染废水再生回用率低的主要原因。试验尝试对原棉纤维直接用活性染料在常温下进行无盐染色,以减少染色废水中的含盐量。研究结果表明,染色纤维的固色率随碱剂用量的增加呈现先增加后减小的趋势,当碱剂质量浓度为30 g/L时,染色纤维的固色率达到最大值91.0%。随着染色时间的延长,固色率逐渐增加,当染色时间为10 h时,固色率达到最大值79.3%。原棉纤维染色后,在皂洗过程中添加适量双氧水,可获得与常规散纤维染色工艺相同的染色效果。染色纤维的主体长度、断裂强度与短绒率均优于常规散纤维染色工艺。

The high salt content of dyeing effluents results in its low regeneration and reuse rate. In or- der to reduce the salt amount in dyeing effluents, salt-free dyeing of grey cotton fibers with reactive dyes at room temperature is investigated. The results show that the fixation yield first increases and then decreases with the increasing of alkali dosage. When the dosage of alkali agent is 30 g/L, the fixa- tion yield can reach the maximum value of 91%. With the increase of dyeing time, the fixation yield in- creases gradually. When the dyeing time is 10 h, the fixation yield reaches the maximum value of 79.3%. Adding hydrogen peroxide into soaping process, the salt-free cotton fiber dyeings can achieve the same color performance with those with traditional dyeing process. The fiber length, the breaking strength and the short fiber content of salt-free dyeings are superior to those with traditional dyeing process.