Dyeing mechanism of Disperse Dye. 

Context in source publication

Context 1

... dye of hydrophobic nature has extremely poor solubility in water (Trotman, 1984) [1]; for this reason dispersing agent is added to the dye bath to maintain dispersion stability, especially in the case of high temperature dyeing (Bukinshaw, 1995) [2]. In dye bath, the dye transfer to fiber from the micelles aggregate of surfactant molecules dispersed in a liquid colloid. As micelles empty their dye, they reform and dissolve more dye from the solid particles [3]. In presence of dispersing agents, the following equilibrium situation is set up (fig 1) [4]. Satisfactory fastness to light, washing, rubbing, sublimation and burnt gas fumes, is particularly significant for disperse dyes [5]. The dyeing of artificially made fibres with disperse dyes generally have good fastness properties [6]. After the applications of fluorescent azo disperse dyes on polyester fiber, it has been found that it enhances various fastness properties [7]. Experiment showed the increase of photo physical properties after application of fluorescent acid azo dyes on wool, silk and nylon [8]. Fluorescent disperse dyes have the unique property of absorbing in the UV range and emitting in the visible region of the electromagnetic spectrum and which owe their potential application to their intense fluorescence properties [9]. The application of fluorescent dyes are associated with their ability to attract attention, because of the remarkable vivid brilliance of the color and dyes are associated with their ability to attract attention, because of the remarkable vivid brilliance of the colors [10] Synolon EXW dyes are state-of-the-art disperse dyes with the highest wash fastness. They meet the requirements of the major retailers and even the most severe fastness tests [11]. They are highly recommended for Polyester/Elastin blends, especially for sportswear [12]. At 120°C temperature the dye exhaustion of Synolon Yellow EXW fluorescent disperse dye was found 30% and this increased to 60% when the temperature raised to 130°C. After 40 minutes of run time the exhaustion% increased to 70% [13]. Fluorescent dyes can be applied in various differentiated fields. But one of the leading application fields where fluorescent dyes have long been used is for the dyeing of flat materials, especially textiles. The application of fluorescent dyes results a significant increase in color brightness, which makes the dyed materials more easily perceptible. The materials dyed with fluorescent dyes render a unique advantage for manufacturing sports clothing and clothing for special services, such as fire brigades and the police because of the intensified perceptibility [14]. Recently, the application of fluorescent dyes in medical diagnostic and biochemical investigations has developed extremely dynamically [15].In comparison of disperse dyes of different auxiliary groups, dyes containing benzothiazolyl residue have better fastness properties than that of the azo disperse dyes based on 2-naphthol ...