By M. L. Gulrajani
Using dyes and finishes has an important impression at the aesthetic charm and performance of technical textiles. Drawing on key examine, Advances within the dyeing and completing of technical textiles information vital advances during this box and their variety of functions. half one experiences advances in dyes and colourants, together with a number of practical dyes, the results they are often used to create and rules concerning their use. half is going directly to examine completing options, comparable to using enzymes, nanotechnology and speciality polymers.
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Extra info for Advances in the dyeing and finishing of technical textiles
The diisobutyl ester of perylene-3,9-dicarboxylic acid is a long-established fluorescent dye, CI Solvent Green 5 (Fig. 8b), exhibiting strong yellow-green fluorescence. Dyes of this class have another functional property, pleochroism . Perylenetetra carboxylic acid diarylimides with the general structure of Fig. 8c are used in bulk dyeing of plastics, producing light-fast red colors. Perylene colorants are especially important as they give bright colors with very high fluorescence efficiency and good heat, light and chemical stability [230–246].
Even a very dilute solution of fluorescein has an intense greenish-yellow fluorescence. Fluorescein (Fig. 6a) and uranin (its disodium salt) are yellow dyes with an intense fluorescence. Fluorescein is synthesized by reacting phthalic anhydride with resorcinol. The halogenated derivatives like eosin (brominated), erythrosines (iodinated compounds), phloxine, and Rose Bengal are important derivatives of fluorescein. Aminoxanthenes, called rhodamines, are of major importance as fluorescent dyes. They are intensely brilliant, bluish red fluorescent dyes with higher quantum yields and absorptivity for coloring paper, plastics and inks.
This chapter describes the structural aspects of these functional textile dyes. 2 High light-fast dyes – dyes with inbuilt UV-absorbing units Photodegradation of textile substrates as well as colorants has become important in view of the durability of both substrates and color. Sometimes the energy associated with the high-energy radiation is absorbed by the colorant and transferred to the textile substrate, causing loss of strength of the polymeric substrate. In order to circumvent these problems UV-absorbers are added as additives during fiber manufacture or textile finishing.