Abstract
This work focused on the evaluation of the kinetics of dyeing polyester fabrics with high molecular weight disperse dyes, at low temperature by solvent microemulsion. This study also compared the effect of two non-toxic agro-sourced auxiliaries (o-vanillin and coumarin) using a non-toxic organic solvent. A dyeing bath consisting of a micro-emulsion system involving a small proportion of n-butyl acetate was used, and the kinetics of dyeing were analysed at four temperatures (83, 90, 95 and 100 °C). Moreover, the dyeing rate constants, correlation coefficient and activation energies were proposed for this system. It was found that o-vanillin yielded higher dye absorption levels than coumarin, leading to exhaustions of 88% and 87% for Disperse Red 167 and Disperse Blue 79, respectively. K/S values of dyed polyester were also found to be higher for dye baths containing o-vanillin with respect to the ones with coumarin. In terms of hot pressing fastness and wash fastness, generally no adverse influence on fastness properties was reported, while o-vanillin showed slightly better results compared to coumarin.
Highlights
Polyester (Polyethylene terephthalate) (PES) fibres are the most used fibres in the global apparel industry, and are a prominent topic of research
We investigated the kinetics of dyeing PES fabrics with two high molecular weight disperse dyes (Disperse Red 167 and Disperse Blue 79), in a micro-emulsion system involving a small proportion of a non-toxic organic solvent (n-butyl acetate), and two potential auxiliaries (o-vanillin and coumarin)
Based on the kinetics and K/S analysis, it was found that both auxiliaries at temperatures near to 100 ◦ C led to a good dyeing absorption level in PES fabrics
Summary
Polyester (Polyethylene terephthalate) (PES) fibres are the most used fibres in the global apparel industry, and are a prominent topic of research. Carrión-Fite proposed a low-temperature dyeing process in the presence of a micro-emulsion obtained by ultrasonic agitation, composed of a low proportion an alkyl halogen solvent and a phosphoglyceride emulsifier [11] In this sense, it was proved that ultra-sonic cavitation improves the dyeing rate constant, and the dye absorbed by the fibre [12,13]. Carrión-Fite and Radei [14] proposed the use of more environmentally friendly dyeing auxiliaries based on o-vanillin or coumarin in an n-butylacetate co-solvent (an organic non-toxic solvent) for low molecular weight disperse dyes (C.I. Disperse Blue 56 and C.I. Disperse Red 73). We investigated the kinetics of dyeing PES fabrics with two high molecular weight disperse dyes (Disperse Red 167 and Disperse Blue 79), in a micro-emulsion system involving a small proportion of a non-toxic organic solvent (n-butyl acetate), and two potential auxiliaries (o-vanillin and coumarin).
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