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Design, synthesis and application of easy wash‐off reactive dyes
Author(s) -
Suwanruji Potjanart,
Freeman Harold S
Publication year - 2006
Publication title -
coloration technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 1472-3581
DOI - 10.1111/j.1478-4408.2006.00002.x
Subject(s) - bifunctional , hydrolysis , rubbing , chemistry , reactive dye , solubility , polymer chemistry , chemical engineering , organic chemistry , dyeing , engineering , catalysis
New dyes that not only give good fixation levels but also relatively low substantivity in the hydrolysed form were the targets of this research. Our approach involved lowering the substantivity of the hydrolysed dye by reducing the planarity that is required for dyes to have high substantivity on cotton. In this regard, bifunctional bis‐dichlorotriazine (bis‐DCT) and tetrafunctional bis‐monochlorotriazine/bis‐sulphatoethyl sulphone [bis‐(MCT/SES)] reactive dyes were made, using selected diaminobiphenyls. Bis‐DCT bifunctional reactive dyes were applied to cotton by a pad–batch method, while bis‐(MCT/SES) tetrafunctional reactive dyes were applied to cotton by a pad–dry–cure. Following dye application, it was found that the resultant hydrolysed dyes easily washed off the fibre surface and that the dyed cotton fabrics had colour fastness to rubbing and laundering properties that were comparable with the commercial prototypes used in this study. However, it is also apparent that the combination of relatively low water solubility and large molecular size has an adverse effect on fibre penetration.