Premium
Low‐chrome dyeing.
Author(s) -
Xing Jianwei,
Pailthorpe M T
Publication year - 1992
Publication title -
journal of the society of dyers and colourists
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 0037-9859
DOI - 10.1111/j.1478-4408.1992.tb01458.x
Subject(s) - wool , chromium , dyeing , rare earth , chemistry , chelation , chloride , potassium dichromate , inorganic chemistry , nuclear chemistry , materials science , mineralogy , organic chemistry , composite material
The effect of a rare earth chloride mixture on the reduction of chromium residues in chrome dyebath effluents has been investigated. Chelation between the rare earth cations and chrome dyes took place and level chroming results were obtained even when reduced quantities of dichromate were used in the afterchroming stage. An explanation of these effects is given based on an ion exchange between the trivalent chromium and the rare earth cations during the afterchroming stage. A significant reduction in chromium residues in the dyebath was observed due primarily to the reduction in dichromate addition. The colour of the ‘rare earth’ dyed wool was similar to that of conventionally afterchrome dyed wool. The colour fastness properties of the ‘rare earth’ dyeings were not adversely affected and wool damage was slightly reduced.