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Title: Nickel chelates as dyes
Author: Vohra, A. A.
Awarding Body: University of Manchester
Current Institution: University of Manchester
Date of Award: 1986
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The chelates of seven commercial disperse dyes with nickel, copper and chromium have been formed in cotton and in nylon 6 fabrics. Exhaustion dyeing was satisfactory on nylon 6 and subsequent treatment in the metal salt solution at optimum pH was followed by steaming. The cotton was pretreated with a urea/melamine precondensate with glyoxal formaldehyde, and a polyethylene glycol. Dye was introduced by vapor-transfer from coated paper. Chelation was achieved in a final step. The hue and brightness, fastness to Light, washing and perspiration were assessed for the dyed fabrics. The nickel complexes were in general found to be slightly better than the chromium and copper complexes. Photodegeration of the fibres was reduced by the presence of the nickel complexes. Average stabilisation of nylon 6 was found to be 43% and that of cotton 23%. It may be possible to use selected nickel chelates as dyes that stabilise photodegradabLe fibres. The amount of nickel reacting with the dyed cotton fabric was determined by employing atomic absorption spectroscopy.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available