Synthesis of acid dyes containing polyetheramine moieties and their low‐temperature dyeing properties on wool fiber

Abstract

To realize the low-temperature dyeing of wool fibers, the use of auxiliaries and wool modification are common methods. Low-temperature auxiliaries may cause water-pollution problems, and wool modification is a costly and uncontrollable process. In this study, new acid dyes, named D1-D3, containing polyetheramine groups were synthesized and applied to wool fiber by conventional and low-temperature exhaust dyeing procedures. The results indicate that the new acid dyes could interact with wool-fiber-like auxiliaries and render a high exhaustion rate to the wool fiber at a dyeing temperature of 80 8C. In comparison with Acid Blue 25, the D1-D3 dyes showed an increased dyeing rate, especially under a dyeing temperature of 80 8C. Despite the bigger relative molecular masses of D1-D3, the exhaustion rates of D1-D3 were still higher, and the times of half-dyeing were shorter than that of Acid Blue 25. The color differences between the wool fabrics dyed with the four dyes at 80 and 98 8C, respectively, were compared. We found that the color differences of D1-D3 between 80 and 98 8C were smaller than that of Acid Blue 25. The interactions between the dyes and wool fiber were analyzed and manifested by the measurement of the f potential of the dyes and wool fiber. The leveling and transfer properties of the D1-D3 dyes were also investigated, and the color differences of the wool fabrics dyed with Acid Blue 25, D1, and D2 were very low at all measured pH values and temperatures. The fastnesses of D1-D3 on wool fabric were almost the same as that of Acid Blue 25.

Preparation and Characterization of Self-Dispersing Phthalocyanine Blue 15:4 Pigment for Dyeing of Wool Textiles

“…When the pH is higher than the isoelectric point, the carboxyl groups on the wool surface are ionized and the wool surface is negatively charged. Acid dyes bind to wool fabrics by ionic bonds under acidic conditions [4][5][6][7]. Dyeing wool fabrics is a solution-based process that consumes an excessive amount of water and energy, and pollutes the environment [8][9][10][11][12][13].…”