Reactive modified curcumin for high-fastness nonaqueous SC-CO 2 dyeing of cotton fabric
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ORIGINAL RESEARCH
Reactive modified curcumin for high-fastness nonaqueous SC-CO2 dyeing of cotton fabric Mingyue Wang . Mao Liu . Hongjuan Zhao Laijiu Zheng
. Xiaoqing Xiong .
Received: 3 July 2020 / Accepted: 1 October 2020 Ó Springer Nature B.V. 2020
Abstract Modified curcumin, which has the advantages of low toxicity, high solubility, and little color change after modification, is very suitable for nonaqueous supercritical carbon dioxide cotton dyeing. However, the existing curcumin modification technology focuses on improving its solubility. Modified curcumin is directly adsorbed onto cotton fabrics, and the main interaction forces are van der Waals forces, which causes the poor fastness of modified curcumin to dyed cotton fabrics. In this study, reactive groups (hydroxyalkyls) were introduced into curcumin to enhance its fastness to cotton fabrics. The results showed that, similar to alkyl groups, hydroxyalkyl
groups can enhance the color depth of dyed cotton fabrics by elevating the solubility of modified curcumin in supercritical carbon dioxide. The higher the solubility of modified curcumin in supercritical carbon dioxide was, the higher the K/S value of the dyed cotton fabric. Furthermore, the hydroxyl groups on the modified curcumin could form ether bonds with the hydroxyl groups on cotton fabrics. Therefore, the washing and rubbing fastness of hydroxyalkyl-curcumin-dyed cotton fabric was better than that of alkylcurcumin-dyed cotton fabric.
M. Wang M. Liu H. Zhao (&) X. Xiong L. Zheng School of Textile and Material Engineering, Dalian Polytechnic University, Dalian 116034, People’s Republic of China e-mail: [email protected]
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Cellulose
Graphic abstract
Keywords Hydroxyalkyl curcumin Cotton fabric Supercritical carbon dioxide dyeing Solubility
Introduction Supercritical fluid dyeing technology has become increasingly important in recent years because of its ecofriendly traits. At the same time, this method has the advantages of saving water and energy, making it a technical revolution in the dyeing industry (Elke et al. 2010). However, Supercritical carbon dioxide (SCCO2) fluid dyeing technology has not been carried out for cotton because of the lack of a suitable dye for SCCO2 cotton dyeing (Abou Elmaaty and Abd El-Aziz 2018; Banchero 2013). Currently, dyes for SC-CO2 cotton dyeing can be categorized under two broad categories: reactive disperse dyes and natural dyes. The main problems of reactive disperse dyes are their high toxicity and poor biodegradability (Fan et al. 2019; Gao et al. 2014, 2015; Long et al. 2012, 2015; Luo et al. 2018; Yang et al. 2017; Zhang et al. 2018, 2016). Natural dyes have low toxicity and good biodegradability, but their solubilities in SC-CO2 are low, resulting in a low color depth of dyed cotton fabrics (Reddy et al. 2013; Xie et al. 2015; Zhan et al. 2017). Although the introduction of alkyl groups can improve the solubility of natural dyes in SC-CO2, the introduction of alkyl groups significantly
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