What Are Acid Dyes and Their Chemical Structure?

What are Acid Dyes?

Acid dyes are water-soluble, own excellent light fastness properties as compared to basic dyes. These are widely used in the textile sector for the protein fibres such as wool, silk, nylon, and modified acrylics. They possess the sulphonic acid groups that are available as sodium sulphonate salts. When dissolved in water they pass the negative charge to the dye molecules. In the case of acid solutions, the -NH2 functionalities of the fibres are protonated to give a positive charge: -NH3+. This charge binds with the negative dye charge, allowing the formation of ionic interactions. The acid dyes can be divided into two sub-groups: Acid-leveling and Acid-milling.

Chemical Structure of Acid Dyes

These are the large aromatic molecules with complex structures, having a sulphonyl or amino group that enables the solubility of the dye in water. Acid dyes belong to the three main structural molecules.

1. Anthraquinone dye
2. Azo dye
3. Triphenylmethane dye

Alliance Organics LLP is the leading acid dyes manufacturers in India, offers a variety of acid dyes like Acid Blue 9, Acid Blue 80, Acid Violet 17 and many more for different applications.

Source: — What Are Acid Dyes and their Chemical Structure