98—SOLVENT-ASSISTED DYEING OF WOOL

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Abstract
An investigation has been made of the influence of various factors on the dyeing rate of wool in the presence of alcohols or amines. It is shown that an absorption of solvent on wool is necessary for obtaining an increase in dyeing rate; for benzyl alcohol, the dyeing rate is a rectilinear function of the amount of absorption for the dye used. By applying an indicator dye, acting as an indicator acid, it has been possible to show that an increase in dyeing rate of the acid form can be obtained with alcohols, while an increase in the dyeing rate of the basic form is obtained only with amines. The partition ratio of the two forms of the indicator between buffer solutions and alcohols or amines at high liquor ratios (200 : 1 to 400 : 1) has been determined and related to the dyeing rates, resulting in a hypothesis for the mechanism of solvent-assisted dyeing of wool. The dyeing rate of surface-treated wool in the presence of solvents has also been investigated.

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