Dyeing Cellulosic Knitwear, Woven Fabrics and Apparel By Exhaustion With Novel Reactive Indigo Dye

摘要

Dyeing of cellulosic fibers with indigo dye is based on a process of reduction of the insoluble blue dye to a soluble dye in a leuco form, of a yellowish color. The oxidation, which can be done by exposure to air, returns the dye to its insoluble characteristic color. The problem is that on exhaustion dyeing, mainly for knitwear and garment dyeing, it is not possible to dye uniform colors, due to premature oxidation of the dye. One way to overcome this problem is to dye with the dye in its oxidized form. In our process a novel dye was developed based on the insoluble indigo color, with reactive groups which give it affinity and fastness. The results for uniformity and washfastness are presented.