Supercritical fluid dyeing of cotton modified with 2,4,6‐trichloro‐1,3,5‐triazine

Abstract

Supercritical carbon dioxide dyeing of cotton modified with the fibre reactive group 2,4,6‐trichloro‐1,3,5‐triazine has been examined and the results are discussed. The modification of cotton was carried out in acetone, as well as by a new method using water as the solvent. For level dyeing results a degree of fixation of the fibre reactive group on cotton of 3% owf was required without changing the hydrophilicity of the fibre. The results show that dyeing of modified cotton is possible with dyes containing hydroxy or amino groups which react via a substitution reaction with the chlorine atoms of 4,6‐dichloro‐1,3,5‐triazine‐2‐yl on the fibre surface. The K/S values at 383 nm of modified cotton dyed with CI Disperse Yellow 23 were found to be between 1.44 and 4.79 depending on the dyeing conditions used. The washing, rubbing and light fastness data that were obtained were between 3 and 5.