What makes a good azo dye?
They have excellent coloring properties, mainly in the yellow to red range, as well as good lightfastness. The lightfastness depends not only on the properties of the organic azo compound, but also on the way they have been absorbed on the pigment carrier.
What is an azo dye give an example?
Azo dye are a large class of synthetic organic dyes, that contain nitrogen as the azo group or āN=Nā as a part of their molecular structures. Orange-1 is an example of azo dye.
Are azo dyes synthetic?
Azo dyes are the most important synthetic colorants which have been widely used in textile, printing, paper manufacturing, etc. [7].
Which compound can be used to prepare azo dye?
When aniline is treated with HNO2 at 0-5āC then diazonium salt is formed and by the coupling of diazonium salt and phenol azo dyes are prepared.
Is azo dye is water soluble?
The most easily applied azo dyes are those designated as direct: they contain chemical substituents that make them soluble in water, and they are absorbed from solution by cotton.
Which dye is an azo dye?
Tartrazine is a yellow acid azo dye discovered in 1884 and still in common use. Other azo dyes contain chemical groups that bind metal ions.
What is azo dyes textile?
Azo dyes are the largest group of synthetic aromatic dye used in the textile industry for dyeing purpose and are highly water soluble in nature. In textile azo dyes, synthetic dye, reactive dye, acid dye, sulfur dye, basic dye, oxidation dye, anthraquinone dye, acridine dye and many other different colorants are used.
How do you make azo compound?
They are straightforward to make and of industrial importance. Azo dyes are prepared in a two step reaction, the first being the synthesis of an aromatic diazonium ion from an aniline derivative. The next step is coupling of the diazonium salt with an aromatic compound (shown below is the preparation of methyl yellow).