The Use of Non‐ionic Level‐dyeing Assistants with Chrome‐complex Dyes

Publisher Website
Google Scholar
Abstract
The factors involved in the absorption of chrome‐complex dyes by wool and the problems arising in the search for level‐dyeing assistants are discussed, with particular reference to the use of such non‐ionic agents as Diapersol A (ICI), Lissapol N (ICI), Palatine Fast Salt O (IG), etc.The reactions between Lissapol N and chrome‐complex dyes have been studied. The formation of a complex between Lissapol N and chrome‐complex dyes has been observed and measured quantitatively under controlled conditions. Complex formation appears to take place via the acid groups in the dye molecule.It has been shown that the complex formation between the chrome‐complex dyes and Lhapol N causes the latter to have a beneficial action in chrome‐complex dyebath, notably in the prevention of skittery dyeing.A dyeing process has been developed, involving the use of 5% sulphuric acid, 20% Glauber's salt, and 1–2% Lissapol N on the weight of goods, which enables the acid addition to the dyebath to be reduced with minimum loss of levelling end the virtual prevention of skittery absorption. Comparisons are made between the new dyeing method and previously recommended decreased‐acid methods which employed other agents. Lissapol N has been shown to be superior to other level‐dyeing assistants for chrome‐complex dyes from the points of view of greater effectiveness and greater ease of use because of non‐frothing.

This publication has 2 references indexed in Scilit: