Azoic dye definition is – any of a group of water-insoluble azo dyes formed by coupling of the components on the fiber —called also ice color, ingrain dye. The dyes containing azo groups – N = N – are called Azoic Dye. These are not ready made dyes but are produced by reaction of two. Structure, Chemical Name, CAS, MF. 4-Chloronitroaniline · , C6H5ClN2O2. 3-Chloromethylaniline · , C7H8ClN. 2-Amino
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Mazharul Islam Kiron is a textile consultant and researcher on online business promotion. He is working with one European textile machinery company as a country agent. He is also a contributor of Wikipedia.
LinkedIn Facebook Google Plus. Name of the experiment: Dyeing of cotton fabric with azoic dyes. These dyes are not found in readymade form. Azoic dyes are produced by a reaction between two components.
Coupling Compound Naphthol Di-azo —compound or diazo base or diazo salt. For making naphthol solution, at first naphthol aoic glycerine are added in dye bath. Then NaOH is added into the bath. Finally salt and water are added into the bath. Then fabric is immersed into this solution for few minutes.
And the fabric becomes naphthaled. Then acetic acid and sodium acetate are added into the dye bath. And mixed them very well. Finally thickener and required amount of water is added and stirred them very well for getting required viscosity.
The naphtholated fabric is then printed with base printing paste by block and screen printing method.
After azoiv the printed fabric is dried at for minute in a dryer. Our naphtholation process was not so sufficient. So printing becomes uneven.
But we learn about the printing of cotton fabric with azoic dye. Because of high degree of brightness, ease of application and excellent fastness properties except rubbing fastness which can be improved by using certain auxiliaries azoic combinations naphthol and bases are widely used in printing on cellulose fiber fabrics.
Azoic dyes are used for producing bright shade of color such as orange, red, scarlet, navy blue, and black color. By this practical we acquire knowledge about the printing process of cotton fabric with azoic dyes.
Azoic Dye | Definition of Azoic Dye by Merriam-Webster
This practical will help us in our study life as well as job life. Especial thanks to our teacher and his assistants for great co-operation. Students, teachers and professionals can publish your article here. It is a platform to express your dyea throughout the world.