Application of a hydrolyzable cationic agent, poly(acryloxyethyl trimethylammonium chloride), in salt-free reactive dyeing for good dyeing properties

摘要

Poly(acryloxyethyl trimethylammonium chloride) (PAOTAC), in which cationic groups were connected with the polymer skeleton through ester bonds, was applied in the salt-free reactive dyeing of cotton with the aim of achieving good dyeing properties. Exhaust and exhaust-pad-steam dyeing procedures were used with the cotton cationized with PAOTAC in the absence of sa for comparison, both dyeing procedures were also applied with the untreated cotton in the presence of salt. The dyeing results show that only the exhaust-pad-steam dyeing procedure was suitable for dyeing cationic cotton to achieve a high dye fixation. Color yields, colorimetric properties, fastness properties, dyeing levelness, and penetration behaviors with different dyeing methods were evaluated. Compared with the dyeings with untreated cotton in conventional exhaust dyeing, dyeings with cationic cotton in the exhaust-pad-steam procedure showed equivalent or even better fastness with generally higher color yields and good dye penetration. Possible reasons for the improved salt-free dyeing properties were proposed, and the hydrolysis of ester bonds within PAOTAC under the dyeing conditions was proven by IR spectroscopy.