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Title: The development of a metal-free, tannic acid-based aftertreatment of nylon 6.6 dyed with acid dyes
Author: Bahojb-Allafan, Babak
Awarding Body: University of Leeds
Current Institution: University of Leeds
Date of Award: 2004
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During the course of this project, a variety of different areas dealing with the aftertreatment of nylon 6.6 dyed with commercial acid dyes was investigated in an attempt to increase the fastness of dyeings to wet treatment. Protease enzyme was used in conjunction with tannic acid in a single-bath, two stage aftertreatment for nylon 6.6 dyed with acid dyes. The effectiveness of this tannic acid/enzyme aftertreatment was comparable to that of six established aftertreatments namely four commercial syntans, the traditional full backtan and a tannic acid/tin system. The metal-free, tannic acid/enzyme aftertreatment offers a potentially more environmentally acceptable alternative to the antimony-based full backtan aftertreatment, as well as formaldehyde-based syntans and tin-derived system. The effectiveness of the newly developed tannic acid/enzyme aftertreatment in improving the fastness to repeated washing of commercial acid dyes on nylon 6.6 was measured against that of a traditional full backtan aftertreatment. The efficiency of the tannic acid/enzyme system was examined under different aftertreatment conditions including temperature, pH and time. The aftertreatment created a system that was free from any heavy metals and environmentally friendly.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available