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Abstract
Cellulose diacetate fibers were prepared from cellulosic biomass with high α-cellulose contents such as purified cotton linters and wood pulps. Cellulose diacetate fibers are sensitive to alkaline solution, which causes hydrolysis of the acetate ester to hydroxyl groups, especially at high temperatures. Thus, the low alkali-resistance of cellulose acetate fibers makes it difficult to achieve high wash fastness by restricting the application of intense after-treatment, such as reduction clearing. A series of N-methylphthalimide-based high-washable azo disperse dyes were synthesized and their dyeing and fastness properties on cellulose diacetate fabrics were investigated. From the overall results obtained in this study, N-methylphthalimidylazo disperse dyes are expected to be a desirable alternative to high value-added dyes that can be used for high color fastness dyeing of cellulose diacetate with a minimal discharge of wastewater during washing process.
Highlights
Cellulose and its derivatives are attracting increasing attention as renewable, economical, and abundant resources to reduce dependency on fossil resources [1,2,3]
Our study investigated the the dyeing and and fastness properties of N-methylphthalimide-based
Results probably attributable to the excellent from the easy clearability. These are results are probably attributable to the wash-off excellentproperties wash-off resulting properties resulting from the easy imparted by the ring opening of phthalimide ring structure
Summary
Cellulose and its derivatives are attracting increasing attention as renewable, economical, and abundant resources to reduce dependency on fossil resources [1,2,3]. Cellulose acetate has been recognized as by far the most important derivative of cellulose because of its versatile industrial and commercial applications [4,5]. The cellulose hydroxyl groups are esterified by the acetic anhydride to form cellulose acetates—the fiber forming components. Cellulose diacetate fibers are widely used in the apparel industry because of their superior properties, such as silk-like softness, luster, comfort, and good draping quality. Dyes with satisfactory properties—non-toxicity, environmentally friendliness, and high color fastness, have been a major impediment in their use in the textile industry. Due to their hydrophobic nature, efficient dyeing requires the use of dyes with limited water solubility; disperse dyes are sparingly soluble in Materials 2020, 13, 4924; doi:10.3390/ma13214924 www.mdpi.com/journal/materials
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