Abstract
An investigation is reported in which the shrink-resistance of wool treated by exhaustion with Synthappret BAP and magnesium chloride was improved by the introduction of a strongly alkaline treatment immediately before or after the polymer-application step. The greatest improvements were observed with pre-treatments at around pH 11 or with after-treatments at around pH 10. After-treatments gave a greater improvement. The improved shrink-resistance was attributed to the promotion by alkali (in the bath, or carried over on the fibres) of reactions of the carbamoyl sulphonate groups in Synthappret BAP with themselves (cross-linking) or with the fibre. Alkaline pre-treatments were considered to be more practical than after-treatments. They could be simply incorporated into the normal Synthappret BAP–magnesium chloride exhaustion-processing sequence by a change from a neutral or mildly alkaline scour with non-ionic detergents to a preliminary scour with sodium carbonate or metasilicate solution at pH 11. Alkal...
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