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Low‐temperature Dyeing of Wool in the Presence of Urea and Related Compounds
Author(s) -
Burdett B C,
Galek J A
Publication year - 1982
Publication title -
journal of the society of dyers and colourists
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 0037-9859
DOI - 10.1111/j.1478-4408.1982.tb03610.x
Subject(s) - dyeing , wool , urea , thiourea , chemistry , adsorption , ionic strength , organic chemistry , nuclear chemistry , materials science , composite material , aqueous solution
An investigation has been carried out into the effect of urea, thiourea and related compounds on the rate of dyeing of C. I. Acid Red 18 on wool. At the same time, the object was also to find a more efficient accelerant than urea. Of the 44 compounds originally used in a preliminary investigation, only eleven were retained for detailed study and of these only five were more effective than urea. Disaggregation and solvatochromism of C. I. Acid Red 18 occurred in the presence of the selected compounds and, although many of the latter were preferentially adsorbed by wool, negligible fibre damage occurred. Increasing the ionic strength of the solutions depressed the dyeing rate. Several mixtures of urea and related compounds gave similar effects to that produced by urea alone, both by an exhaust technique and a pad—batch technique, and it is proposed that they be used in the commercial cold pad‐batch process.