Effect of pretreatment with pentanol for dyeing wool fibers at low temperature

Abstract

This paper describes the influence of pre-treatment with pentanol for the dyeing of wool fibers at low temperatures. Wool fiber is expensive to produce and process; accordingly, it must be economically viable and meet consumer demands. Acid dyes are the most important class of commercial dyes and account for more than half of the dyes in the industry. Isomers of pentanol and alcohols with a longer carbon chain have higher reactivity at low temperatures and lower impact resistance. In the experimental part, the 100% wool fiber 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. This is followed by dyeing the treated fibers with Supramin blau acid dye. The used dye concentrations were 100, 200, 300, 400, and 500 mg/dm3. The time of dyeing was 5, 10, 20, 30, 40, 50, and 60 minutes. Pretreated wool fibers with pentanol give good results at low temperatures i.e. 40°C. A constant increase in the degree of dye exhaustion on the pretreated wool fiber was observed during the increase in the initial concentration of the dye. A longer dyeing time for pretreated wool results in a higher degree of exhaustion. A pseudo-first-order adsorption model can be used to describe the adsorption process because there is very little deviation around the ideal curve and functional straight lines cover most points.

Keywords

• wool
• dyeing
• pentanol
• pseudo-first-order
• pseudo-second-order