Journal
TEXTILE RESEARCH JOURNAL
Volume 77, Issue 1, Pages 38-46Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/0040517507076328
Keywords
cotton; dyeing; supercritical carbon dioxide; nonpolar reactive disperse dye; pretreatment; fixation; coloration
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A new simple method to improve the dyeability of cotton in supercritical carbon dioxide, which does not require any chemical modification of the cotton, is described here. The affinity of the cotton is enhanced through physical interactions between the pretreatment solvent and the cotton structure. Addition of cosolvents and dissolution of the dye greatly improved the coloration and fixation of the cotton. Experiments with different solvents as pretreatment and as cosolvents were performed. Methanol was found to be the best solvent for the pretreatment. Dimethylsulfoxide (DMSO) as cosolvent and dye carrier provided the highest cotton coloration (K/S 15.3), but a fixation of only 2%. An increase in fixation to 62% was achieved when methanol was the cosolvent and the dye carrier.
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