无尿素活性印花工艺探究

Study on the Urea-Free Reactive Printing Process

活性染料由于色彩艳丽,色谱齐全,色牢度较好等优点,被广泛应用于纤维素纤维、蛋白质纤维的染色印花加工上。活性印花因其色彩丰富、层次鲜明又成为活性染料应用中的一大分支。近年来,环保要求越来越高,污水排放指标中的氨氮、总氮指标一降再降,活性印花色浆中大量尿素的使用限制了活性印花的发展。尿素替代品或者无尿素印花工艺的推出已经是大势所趋。本文结合尿素在活性印花中的作用,初步探究了无尿素活性印花工艺,通过协调印花车速、给浆和烘房温度来保证印花部位合适的保水率,以此保证印花效果和得色量。印花部位的色浆保水率达到65%~70%,可以避免印花搭色又能达到与传统活性染料印花工艺相当的效果。

Reactive dyes are widely used in the dyeing and printing processing of cellulose fiber and protein fiber due to their gorgeous color, complete chromatography and good colorfastness. Reactive printing has become a major branch of reactive dye application because of its rich color and distinct layering. In recent years, the environmental protection requirements are getting higher and higher, the ammonia nitrogen and total nitrogen in sewage discharge index decrease again and again, and the use of a lot of urea in reactive printing color paste limits the development of reactive printing. Urea substitute or urea-free printing process has been the general trend. In this paper, combined with the role of urea in active printing, a preliminary study of urea-free active printing process, through the coordination of printing speed, pulp and oven temperature to ensure the appropriate water retention rate of printing parts, so as to ensure the printing effect and color. The water-retention rate of color paste in the printing part reaches 65%~70%, which can avoid color matching and achieve the same effect as the traditional reactive dye printing process.