engleski

The Influence of Durable Press Finishing on Shade Changes of Dyed Cellulose Fabric

Investigations of the possibility of polycarboxylic acids application have been conducted for some time, but mostly they have not proved appropriate for wider usage so far. Despite their ecologically acceptability most of them are economically unfavourable - still too expensive. The influence of polycarboxylic acid (PCA) chosen and its catalyst on shade changes of cotton material dyed with different reactive dyes has been spectrophotometrically determined. Shade changes are more pronounced, in the case of all applied reactive dyes, when usual quantity of Sodium hypophosphite monohydrate (SHP) catalyst was applied. Minimal shade changes have been obtained with citric acid, especially when second catalyst was applied, because of decreased well-known reducing influence of hypophosphyte catalyst. It was determined as well, that the ratio of CA in a BTCA/CA mixture has a great influence on shade changes, and it is recommendable not to use higher ratio than 1/1 BTCA/CA. The results of wrinkle recovery angles of dyed and cured material have confirmed the assumption of lower cellulose affinity after the dyeing process for further estherification reaction with PCA carboxylic groups, what was more pronounced with higher dyestuff concentrations.

DP finishing; PCA; shade changes

Rad se nalazi na CD-ROM-u, sekcija 12, 1-7.