PROCESS FOR DYEING AND PRINTING NITROGEN CONTAINING NATURAL MATERIALS IN PARTICULAR WOOL,WITH MORDANT DYES

摘要

Dye for wool is prepd. by dispersing mordant to urea or the like which can reduce hexavalent chromium to trivalent chromium and then by adding anion or nonion surfactant, coconut alkanol amine and lauryl alkanol amine. For example, 20 parts mordant(I) and 300 parts urea are dissolved in 400parts hot water. After cooling the mixed soln., 100 parts NaHCO3, 30 parts sodium meta bisulphite and water were added and adjusted to pH6 with CH3COOH. When a combed silver or wool staple was dyed with the dye soln., the fabrics dyed to dark yellow.