Azo dyes: Synthesis, Classification and Utilisation in Textile Industry

Abstract

In this work we have presented a review about azo dyes which the most important synthetic colorants which have been widely used in textile, Azo dyes are organic compounds, which contain the coloring azo function (N=N)and are used in the production of colored materials. Azo compounds have vivid colors and comprise about two-thirds of all synthetic dyes .azo dyes, such as monoazo, diazo, and triazo dyes, are defined by the presence of one or more azo groups (-N=N-) connected to the –OH or –NH2 type auxochrome groups. Then we pointed out synthesis of azo dyes using the traditional method(diazotization/coupling reaction) and preparing a new azo dye using natural polyphenols found in plants, which are used as coupling agents . Finally, we indicate Dyeing process of cotton fabric with azoic dyes as using in textile industry.