Dyeing of previously modified wool fibers with acid dye

Abstract

The paper presents a new approach to dyeing wool fibres with an acid dye. It is about dyeing pretreated wool fibres with pentanol in laboratory conditions. Acid dyes are the most important class of commercial dyes and account for more than half of the dyes in industry. 100% wool fibre was used in this investigation. In the practical part, the wool fibre was treated in pentanol at a temperature of 20 ?C for 30 minutes. After pretreatment, samples were dried and relaxed at room temperature for 24 hours. Then, the treated fibres dyed with acid dye - Supramin blau. The dye concentrations were 100, 200, 300, 400 and 500 mg?dm-3. The time of dyeing process were 5, 10, 20, 30, 40, 50 and 60 minutes. This work gives good results when the wool, especially since the dyeing takes place at a used temperature, 98 ?C. A constant increase in the degree of dye exhaustion was observed during the increase in the initial dye concentration i.e. 100 mg?dm-3. A longer dyeing time for pretreated wool results in a higher degree of dye exhaustion. The Freundlich's and Jovanovic's are applicable for describing the adsorption flow because there is very little scatter around the ideal curve, so functional straight lines cover most points very well.