Synthesis of benzothiazole-azo disperse dyes for high resistance to alkaline treatments and peroxide bleaching
ISSN: 0369-9420
Article publication date: 2 June 2021
Issue publication date: 7 February 2022
Abstract
Purpose
This paper aims to synthesize benzothiazole-azo disperse dyes which can be applied not only for dyeing and alkaline reduction of polyester fabric in one bath, but also for dyeing and peroxide bleaching of cotton/polyester blend fabric in one bath.
Design/methodology/approach
The synthesized benzothiazole-azo disperse dyes were confirmed by proton nuclear magnetic resonance (1H-NMR) spectroscopy, mass spectroscopy (MS) and UV–visible spectrophotometry. The performance on resistance to alkaline treatment and peroxide bleaching was tested by measuring the color strength of polyester fabric dyed with the synthesized benzothiazole-azo disperse dyes under high-temperature and high-pressure conditions.
Findings
Increasing the electron-withdrawing ability of the substituents in the diazo component and the electron-donating ability of the substituents in the coupling component resulted in a significant bathochromic shift of the maximum absorption wavelength. Except that the disperse dyes synthesized from the coupling components containing the hydroxyethyl group were unstable in alkaline solution, all others exhibited high resistance to alkaline treatment and peroxide bleaching.
Practical implications
The synthesized benzothiazole-azo disperse dyes provide the opportunities to combine dyeing and alkaline reduction of polyester fabric into one bath, and combine dyeing and peroxide bleaching of cotton/polyester blend fabric into one bath.
Originality/value
The synthesized benzothiazole-azo disperse dyes help to establish short processes of polyester and polyester/cotton blend fabrics so as to reduce energy consumption and raise production efficiency.
Keywords
Acknowledgements
This work was supported by the National Natural Science Foundation of China (grant number 21978117). .
Citation
Yu, J., Tang, J., Wang, X., Du, J., Xu, C. and Zhang, S. (2022), "Synthesis of benzothiazole-azo disperse dyes for high resistance to alkaline treatments and peroxide bleaching", Pigment & Resin Technology, Vol. 51 No. 2, pp. 186-193. https://doi.org/10.1108/PRT-10-2020-0113
Publisher
:Emerald Publishing Limited
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