AZOIC DYES PDF

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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Properties and Advantages of Azoic Dye – Textile Chapter

In this way the AZO dyes are formed. Why Azo Dye is so called? It has good color fastness. From this reaction the required insoluble AZO dye is produced.

Azoic dyes

To protect from sunlight, we can use Al — sulphate. Dyes for Protein Fibers. It has wide color range. Some key properties of azoic dye have pointed out in the below:. I n loop of knitted fabric the total amount of horizontal rows is known as course.

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It acts dyea a stripping promoter, when used in conjunction with a reducing agent like sodium hydro-sulphide and alkali. Here dyeing operation is completed by two bath arrangement.

An overview of Azo dyes – Textile Apex

Light fastness property is admirable. We all scream for Napthol dispersed in alcohol T. Azoic dye is that which has insoluble azo group. Properties and Advantages of Azoic Dye. Dyes for Synthetic Fibers.

It should be noted here that, azoic dye is different from other dye and the application process also different from others. Two steps are required by dyeing with azoic color. Classification of Nepthol Dyes.

Name of the experiment: 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. In the first step textile goods are dyed by Napthol color. Wash fastness is very good here. Properties of Azoic Dyes: Share to Twitter Share to Facebook.

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Function of different chemicals used in Napthol Dyeing. And is one way more correct than the others?

In Greek, a means not and zoe means to live. Index is 2 to 4.

By treating a fiber with diazoic and coupling components, this process can be achieved. How to use a word that literally drives some people nuts. These are di-azo components and naphthol. To remove excess HCl we should use Na — Acetate. Azoic dyes are produced by a reaction between two components. Stripping method of Azoic color: