Pretreatment of cotton with poly(vinylamine chloride) for salt‐free dyeing with reactive dyes

Abstract

Poly(vinylamine chloride) has been investigated as a pretreatment for the salt‐free dyeing of cotton with reactive dyes. Dye fixation was found to be much higher than by conventional dyeing without pretreatment, even in the presence of a large amount of salt. The influence of pretreatment conditions on dye fixation, such as pad–bake variables and the concentration of poly(vinylamine chloride), has been studied. The dyeing behaviour of CI Reactive Red 2 on pretreated cotton was examined and found to follow a Langmuir‐type adsorption curve. Dyed cotton pretreated with poly(vinylamine chloride) showed excellent wash fastness and good rub fastness. It is concluded that poly(vinylamine chloride) is effective as a pretreatment for salt‐free dyeing with reactive dyes.

Performance of cotton fabric treated with an amino-terminated hyperbranched polymer

“…To solve this problem, a number of studies on cotton dyeing have been carried out to improve the dye uptake or achieve salt-free dyeing. Most research has focused on introducing cationic sites into the cotton fabrics for interactions with anionic dyes [2][3][4][5]. In addition, as the ever-growing demand for healthy living, antimicrobial activity, and antiultraviolet property of the cotton garments have attracted increasing attention, particularly to cotton underclothes, sport clothing, and light garments worn in the summer [6,7].…”

Salt-free reactive dyeing of betaine-modified cationic cotton fabrics with enhanced dye fixation

“…Reactive Blue 19 on cationic cotton fabrics was 4, 5 and 7 grade, respectively, which was the same with that on the untreated ones. These results were inspiring as some reports presented cationization of the fabrics decreased light fastness of the dyes on them [15][16][17]. It was presumably due to that good dye penetrability and high dye fixation was achieved, light fastness…”

“…Although some biopolymers or their derivatives, such as chitosan and its derivative, have been studied, the polymers on cotton may prevent dye penetration into the fibers and influence dye fixation. In addition, the existence of cationic groups on cotton surface easily leads to color staining and results in inferior color fastnesses, especially low light fastness [16][17][18][19].…”

Cotton fabric modification through ceric (IV) ion-initiated graft copolymerisation of 2-methacryloyloxyethyltrimethyl ammonium chloride to enhance the fixation of reactive dyes

“…This process aims to increase the neutral substantivity of anionic reactive dyes for cotton by introducing positively charged sites to cotton. Several possible agents, such as glycidyltrimethylammonium chloride and poly(vinylamine chloride) (Cai et al 1999;Hauser and Tabba 2001;Ma et al 2005;Xie et al 2008;Fu et al 2013;Das et al 2014;Wang et al 2014), can be used to modify cotton; as a result, dyeability is enhanced. These agents generally contain cationic groups, which play an important role in promoting dye absorption.…”