Synthesis of High-washable Phthalimide-based Azo Disperse Dyes and the Application of These Dyes on Cellulose Diacetate Fibers
Vol. 57, No. 3, pp. 159-165,
Jun. 2020
10.12772/TSE.2020.57.159
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Abstract
In disperse dyeing of polyester fibers, reduction clearing is conducted to
improve the wet fastness of the dyed material. However, in the case of disperse dyeing of
cellulose diacetate fabrics, when reduction clearing is conducted, the acetyl groups in cellulose
acetate fibers may be alkali-hydrolyzed, which leads to a deterioration of their characteristic
properties. Therefore, the dyed acetate fabrics are usually after-treated with a
soaping agent at a relatively low temperature for better wet fastness, although it fails to
meet the customer demands. In this study, high-washable phthalimide-based azo disperse
dyes were synthesized, and their dyeing and fastness properties on cellulose diacetate fabrics
were investigated. In particular, conventional 4-aminoazobenzene dyes containing a
nitro group at the 4-position were synthesized to compare their fastness properties on cellulose
acetate with those of phthalimide-based azo disperse dyes.
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