Abstract
Natural dye’s poor affinity for cotton and poor fastness properties still hinder its applications in the textile industry. In this study, a doubled-layered chitosan coating was cured on cotton fabric to serve as bio-mordant and form a protective layer on it. Under the optimal treatment conditions, the maximum qe (adsorption amount) of the natural dye sodium copper chlorophyllin (SCC) calculated from the Langmuir isothermal model was raised from 4.5 g/kg to 19.8 g/kg. The dye uptake of the treated fabric was improved from 22.7% to 96.4% at 1% o.w.f. dye concentration. By a second chitosan layer cured on the dyed fabric via the cross-linking method, the wash fastness of the cotton fabric dyed with SCC can be improved from 3 to 5 (ISO 105 C-06). The natural source of the biopolymer material, chitosan, and its ability to biodegrade at end of life met with the initial objective of green manufacturing in applying natural dyes and natural materials to the textile industry.
Highlights
As green manufacturing is gradually becoming a norm, natural dyes, which are perceived as alternatives to less environmentally friendly oil derived synthetic dyes, such as azo dyes [1], have seen a revival in the textile dyeing industry [2]
Sodium copper chlorophyllin (SCC), a green natural dye derived from chlorophyll [5] and known as C.I
5.6 gcitric pieces of acted as an acid to dissolve chitosan in an aqueous system under acidic conditions, and undyed knitted cotton fabric were immersed in each of the five as-prepared a cross-linking agent chitosan and cellulose via esterification
Summary
As green manufacturing is gradually becoming a norm, natural dyes, which are perceived as alternatives to less environmentally friendly oil derived synthetic dyes, such as azo dyes [1], have seen a revival in the textile dyeing industry [2]. As alternatives to cationic modification, bio-mordants derived from natural polymer materials and sodium alginate, have been widely used in antibacterial finishes [23], micro-capsules [24], have been applied in the textile dyeing [20,21,22]. In addition to the application of absorbing negatively charged substances, chitosan can chitosan as a bio-mordant in wool dyeing and found that chitosan improved the exhaustion of the be applied to finish textiles [34,35], e.g., the durable press finish of cotton [36] and an antibacterial natural dye cochineal. Chitosan was first cross-linked onto cotton fabric as a bio-mordant to improve dye chitosan layer on the dyed fabric through the same cross-linking method with a high concentration exhaustion of SCC.
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