Transcription of Dyeing with Disperse Dyes - InTech - Open
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Dyeing with Disperse Dyes - InTech - Open
10 Dyeing with Disperse Dyes Joonseok Koh Konkuk University South Korea 1. Introduction Before the First World War, almost all dyes were applied from solution in an aqueous dyebath to substrates such as cotton, wool, silk and other natural fibres. However, the introduction of a man-made fibre, cellulose acetate, with its inherent hydrophobic nature, created a situation where very few of the available dyes had affinity for the new fibre. Water-soluble anionic dyes had little substantivity for the fibre and the alkaline conditions required for the application of vat dyes brought about a loss in tensile strength and deterioration in fibre appearance due to the rapid hydrolysis of acetyl groups. The development of Disperse dyes for Dyeing secondary cellulose acetate fibres in the early 1920s was a major technological breakthrough although their major use today is for the coloration of polyesters, the most important group of synthetic fibres (Broadbent, 2001).
Dyeing with Disperse Dyes 199 A whole range of colour shades from yellow to even turquoise blue can be provided by variation of the substituents in different posi tions.
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