首页|Exploring the dyeability and sustainability of lac dye on cotton: a comparative analysis between water and supercritical CO2 dyeing
Exploring the dyeability and sustainability of lac dye on cotton: a comparative analysis between water and supercritical CO2 dyeing
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NETL
NSTL
Emerald Group Publishing
Purpose The textile industry has been seeking sustainable dyeing methods to minimize environmental impact. This study addresses this need by assessing the use of supercritical carbon dioxide (scCO2) dyeing for applying lac dye to cotton fabrics. A comparison with the water dyeing method was made with the primary objective of evaluating the dyeing performance.Design/methodology/approach Dyeing of cotton with lac dye was carried out by water dyeing and the supercritical carbon dioxide (scCO2) dyeing methods incorporating pretreatments and mordanting such as polyethylene glycol 400 (PEG), aluminum acetate (A.A), tannic acid (T.A) and benzamide. The dyeing performance of lac dye on cotton fabrics for both methods as well as mechanical properties were evaluated.Findings This study showed differences in color yield, fastness properties and dyeing efficiency between both methods. Supercritical CO2 showed significantly higher color strength (K/S), uniformity and fastness properties to water dyeing. The K/S values of the water-dyed samples were between 1.10 and 1.76. However, the K/S of scCO2 dyed samples increased from 0.85 to 4.26 when pre-treated with PEG. Also, the use of Aluminum Acetate (A.A) as a mordant gave the highest K/S of 6.35.Originality/value The dyeing of natural fibers, especially cotton, has faced difficulties, especially with the use of natural dyes. In this study, the use of mordants in the dyeing process aids in improving the dyeability of cotton, especially in scCO2 dyeing. This study compares traditional aqueous and scCO2 dyeing methods for lac dye on cotton, focusing on sustainability and dyeability.
Christiana Agbo、Satoko Okubayashi
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Department of Advanced Fibro-Science||Department of Fashion Design and Textile Studies
NETL
NSTL
Emerald Group Publishing
