Journal
FIBERS AND POLYMERS
Volume 20, Issue 11, Pages 2376-2382Publisher
KOREAN FIBER SOC
DOI: 10.1007/s12221-019-9029-2
Keywords
Hydroxyalkyl alizarin; Alkyl alizarin; Supercritical carbon dioxide; Dyeing; Natural fabric
Categories
Funding
- National Natural Science Foundation of China [21606032]
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The supercritical carbon dioxide (SC-CO2) dyeing technology is a green dyeing technology, and the usage of natural dye makes SC-CO2 dyeing technology safer and more environment-friendly. Nevertheless, after using natural dye in SC-CO2 dyeing, the color depth and fastness of dyed natural fabric are poor. In this study, alkyl and hydroxyalkyl groups were grafted onto alizarin, which is a natural dye, to elevate the color depths and fastness of alizarin-derivative-dyed natural fabric. The results demonstrate that the color depths of alkyl-alizarin-dyed and hydroxyalkyl-alizarin-dyed natural fabrics were increased. This has to do with the increase in the solubilities of alkyl alizarin and hydroxyalkyl alizarin in SC-CO2. The hydroxybutyl-alizarin-dyed wool displayed the best color depth (K/S value: 6.44). And the hydroxyalkyl-alizarin-dyed natural fabric showed good washing fastness and rubbing fastness (about 4-5 level), because that hydroxyalkyl alizarin could be linked by a covalent bond to the natural fabric.
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