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An Investigation of the Chemical Reactions involved in the Use of Sodium Formaldehyde‐sulphoxylate in Textile Printing
Author(s) -
Hannay R. J.,
Furness W.
Publication year - 1953
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.1478-4408.1953.tb02802.x
Subject(s) - steaming , formaldehyde , chemistry , decomposition , sodium carbonate , tragacanth , textile , sodium , chemical engineering , organic chemistry , materials science , food science , composite material , engineering
In discharge printing with sodium formaldehyde‐sulphoxylate, reduction of the dye is accompanied by oxidation of the formaldehyde‐sulphoxylate to formaldehyde‐bisulphite. Although some preliminary decomposition has been noted during drying of the cloth immediately after printing, the main object of this investigation has been to determine the extent, and to trace the products, of decomposition of the formaldehyde‐sulphoxylate during the steaming of a printed and dried filament visoose‐rayon crêpe. Methods of analysis are described. Their use has shown that the extent of decomposition of the formaldehyde‐sulphoxylate on steaming depends very much on other constituents of the printing paste. In particular, the influence of added sodium carbonate and sodium sulphite in pastes made up with Hritish gum and gum tragacanth has been traced, and the effect of leaving printed goods overnight in warm storage before steaming has also been investigated. Fluidity tests showed that no appreciable tendering of the crepe occurred under any of the conditions imposed in this investigation.