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A Novel Natural Dye Derivative for Natural Fabric Supercritical Carbon Dioxide Dyeing Technology
Jinsong Wu,Hongjuan Zhao,Mingyue Wang,Weiru Zhi,Xiaoqing Xiong,Laijiu Zheng 한국섬유공학회 2019 Fibers and polymers Vol.20 No.11
The supercritical carbon dioxide (SC-CO2) dyeing technology is a green dyeing technology, and the usage ofnatural dye makes SC-CO2 dyeing technology safer and more environment-friendly. Nevertheless, after using natural dye inSC-CO2 dyeing, the color depth and fastness of dyed natural fabric are poor. In this study, alkyl and hydroxyalkyl groupswere grafted onto alizarin, which is a natural dye, to elevate the color depths and fastness of alizarin-derivative-dyed naturalfabric. The results demonstrate that the color depths of alkyl-alizarin-dyed and hydroxyalkyl-alizarin-dyed natural fabricswere increased. This has to do with the increase in the solubilities of alkyl alizarin and hydroxyalkyl alizarin in SC-CO2. Thehydroxybutyl-alizarin-dyed wool displayed the best color depth (K/S value: 6.44). And the hydroxyalkyl-alizarin-dyednatural fabric showed good washing fastness and rubbing fastness (about 4-5 level), because that hydroxyalkyl alizarin couldbe linked by a covalent bond to the natural fabric.