Green Sustainable Textile Supercritical Dyeing Process Using CO 2 Madder (Rubia t inctorum L.) Extract

Waterless or reduced water consumption dyeing methods based on supercritical technologies are of interest to fabric manufacturers.The study was aimed at developing a dyeing method for natural fibers, in particular linen and silk, by pressure supercritical impregnation using madder alizarin (R. tinctorum) coloring compound produced by supercritical extraction method as an ecological alternative to conventional dyeing methods.A comparative test of fabric dyeing using supercritical and conventional methods was also carried out.In these dyeing technologies, the pretreatment process plays an important role in the color intensity.The tests were performed using fabrics without and with mordants, and the results were compared using the color analysis method.The colors of the dyed samples obtained in the supercritical technology are more in shades of carmine, and in the traditional method in duller reds.The proposed modern and ecological dyeing technology guarantees a good resistance to washing and light.Antibacterial activity tests were also performed using supercritical and ethanol extracts.Dyed fabrics play health-promoting and protective roles for their users.Linen fabrics showed antimicrobial activity and positive effects on the skin, which was more moisturized.Waterless technologies should be developed in conjunction with user and environmental impact studies. 摘要 基于超临界技术的无水或降低耗水量的染色方法引起了织物制造商的兴趣.本研究旨在开发一种天然纤维，特别是亚麻和丝绸的染色方法，采用超临 界萃取法生产的茜素(R.tinctorum)着色化合物作为传统染色方法的生态替代品，通过压力超临界浸渍进行染色.并对超临界法和常规法染色织物 进行了对比试验.在这些染色技术中，预处理过程对颜色强度起着重要作 用. 使用不含媒染剂和有媒染剂的织物进行测试，并使用颜色分析方法对 结果进行比较.