Affiliation:
1. University of Niš, Faculty of Technology, Leskovac, Serbia
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.
Publisher
National Library of Serbia