Deep‐coloured polyester/cotton blends with low concentrations of polymethylol dyes by a one‐pass continuous dyeing process

Abstract

An obvious limitation of the one-pass continuous dyeing process for polyester/cotton blends is its inability to achieve deep colour depth, which is caused by the low dye fixation yields of commercial reactive dyes. In this study, the performances of polyester/cotton blends dyed with high-fixation polymethylol dyes and disperse dyes were compared with those of polyester/cotton blends dyed with a mixture of reactive dyes and disperse dyes. Polymethylol dyes were observed to be suitable for dyeing polyester/cotton blends when used in low concentrations; the required concentrations of polymethylol dyes were only 23-58% of the concentrations of commercial reactive dyes required to reach a given colour level on polyester/cotton blends. The wash and crocking fastness of polyester/cotton blends dyed with polymethylol dyes were similar to those of polyester/ cotton blends dyed with reactive dyes. Coloration Technology Society of Dyers and ColouristsExperimental Materials and chemicals Mercerised 100% cotton (117 g/m 2 ), 100% polyester (114 g/m 2 ), and 55:45 woven polyester/unmercerised cotton blend (114 g/m 2 ) were supplied by Chongqing Qiaozhi Weaving Mill (China).

Dyeing Method and Properties of a Novel Blue Azo-Anthraquinone Reactive Dye on Cotton

“…The dye structure shows a planar configuration of the anthraquinone core part in the dye molecule [23], which exhibits lower substantivity to cotton fibers. For this kind of dye to finish cotton, the “one-bath–one-step” dyeing method was proved to be a suitable process [24]. Thus, in this study, dyeing conditions were optimized for achieving high dye fixation.…”

A new method for determining relative colour strength of dye based on new colour depth formulas. Part I: For different dyes with approximate hue

“…As one of the indispensable materials for textile printing and dyeing processing, there are dyes that makes textiles obtain colour. 1,2 Relative colour strength (RCS) of dye is known as an indicator that is capable of evaluating the dyeing behaviours, it has been widely used for such as vegetable dyes, modified dyes, and the development of other new dye products, 3,4 dyeing properties of fibre and fabric, 5,6 the study on dyeing and finishing process, 7,8 and so on. Moreover, in actual production and processing, even for the same type of dye, due to the different purchase batches, it is usually necessary to use the RCS to test the distinctions of different batches of dyes.…”