Excellent dye fixation on cotton dyed in supercritical carbon dioxide using fluorotriazine reactive dyes
- 1 January 2005
- journal article
- Published by Royal Society of Chemistry (RSC) in Green Chemistry
- Vol. 7 (8), 609-616
- https://doi.org/10.1039/b503801d
Abstract
Development of a water-free dyeing process for cotton is essential for the textile industry due to ecological and economical reasons. In this study, a dyeing method is described where cotton has been effectively dyed in supercritical carbon dioxide (scCO2). Excellent dye fixation of 100%, and colour strength (K/S) values up to 30, were achieved in a small batch reactor and in a scale-up vessel. A series of non-polar reactive dyes with fluorotriazine as reactive group were synthesised at our laboratory. Fluorotriazines were found to be the best dyes for dyeing cotton and their reaction with cotton was improved by adding small quantities of acids to the reaction medium. H3PO4 and HAc were tested at different concentrations on cotton dyed with fluorotriazines. Evenly dyed pieces of cotton without any damage to the cotton fibres were observed in all experiments. An important step forward has been made for the future commercialization of a green process for industrially dying cotton in scCO2. Elimination of water and its costly treatment can be now achieved in the cotton dyeing process.Keywords
This publication has 21 references indexed in Scilit:
- Supercritical fluid dyeing of cotton modified with 2,4,6‐trichloro‐1,3,5‐triazineColoration Technology, 2003
- Past, present and future of supercritical fluid dyeing technology – an overviewColoration Technology, 2002
- A greener approach to cotton dyeings with excellent wash fastnessGreen Chemistry, 2002
- The use of dendrimers to modify the dyeing behaviour of reactive dyes on cottonDyes and Pigments, 2000
- Supercritical Fluid Technology in Textile Processing: An OverviewIndustrial & Engineering Chemistry Research, 2000
- Use of supercritical fluids for different processes including new developments—a reviewChemical Engineering and Processing - Process Intensification, 2000
- A New Method for Improving the Dyeability of Cotton with Reactive DyesTextile Research Journal, 1999
- Dyeing of Cotton in Supercritical Carbon DioxideDyes and Pigments, 1998
- Stepwise versus Concerted Mechanisms at Trigonal Carbon: Transfer of the 1,3,5-Triazinyl Group between Aryl Oxide Ions in Aqueous SolutionJournal of the American Chemical Society, 1995
- Environmentally friendly dyeing of synthetic fibres and textile accessoriesInternational Journal of Clothing Science and Technology, 1995