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- Title
Improving Washfastness of Sulfur Dyes.
- Authors
Perkins, Warren S.; Crew, Benjamin J.
- Abstract
Because of problems associated with the use of chromium-containing compounds in the dyehouse, hydrogen peroxide is a more desirable oxidizing agent for sulfur dyes. However, hydrogen peroxide oxidation of sulfur dyes usually yields dyeings with washfastness ratings greatly inferior to those obtained when sodium or potassium dichromate is used for oxidation. Results of a study of hydrogen peroxide oxidation of sulfur dyes are reported. The poor washfastness obtained when hydrogen peroxide is used for oxidation appears to result from incorporation of acidic groups into the molecular structure of the dye. The washfastness of fabrics dyed with sulfur dyes and oxidized with hydrogen peroxide is equivalent or superior to that obtained with dichromate oxidation when an aromatic amine is added to the acidified hydrogen peroxide oxidation bath or when the dyed fabric is aftertreated with an aromatic amine under acidic conditions.
- Subjects
HYDROGEN peroxide; SULFUR dyes; CHROMIUM compounds; DYES &; dyeing; COLOR in the textile industries; ORGANOSULFUR compounds; INORGANIC compounds; TEXTILE chemicals; TEXTILE chemical industry
- Publication
Textile Chemist & Colorist, 1975, Vol 7, Issue 6, p34
- ISSN
0040-490X
- Publication type
Article