Mordant dyeing of wool by supercritical processing

Few studies have reported the use of supercritical fluids as solvents in dy eing of textile fibers. Studies on synthesis of new dyestuff that can be us ed in this technique and their solubility in the supercritical fluid are at tracting increasing attention. In this study, wool fibers were dyed with mo rdant dyes dissolved in supercritical carbon dioxide. We used three mordant dyes that have chelating ligand properties, 2-nitroso-1-naphthol (C.I. Mor dant Brown), 5-(4-aminophenylazo) salicylic acid (C.I. Mordant Yellow 12) a nd 1,2-dihydroxyanthraquinone (C.I. Mordant Red 11 also called Alizarin) wh ich were dissolved in supercritical carbon dioxide, and five different mord anting metal ions, Cr(III), AI(III), Fe(II), Cu(II) and Sn(II). Wool fibers were mordanted by the metal using conventional techniques and dyed at 333- 353 K temperature and at 150-230 atm pressure. Dyed materials had excellent wash fastness properties. (C) 2000 Elsevier Science B.V. All rights reserv ed.