Importance of Basic and Acid Dyes
Dyes or colors are very much relevant in the textile dyes manufacturing industry. Amongst several classifications, the classification based on pH value term them as acid dyes and basic dyes.
Let’s understand their characteristics and importance.
These dyes are cationic which means they have a positive charge. Since they show the typical properties of a base, they are known as basic dyes.
Since the basic dyes show a positive charge, they get stuck to every fabric. It is the reason; they stain everything they touch during the processing.
Even the plastic and silicone sealants also get the color.
Due to the positive charge, the dye attracts to proteins and nucleic acid in the body. Hence, they are used as a biological stain. However, it is hazardous to the health also.
Usage and importance of basic dyes
The basic dyes include all synthetic textile dyes. They are historically significant, and because of their ability to stain and bind different parts of human cell, the basic dyes are used in the medicines.
The basic dyes can color any fabric, natural or synthetic. However, with the natural fibers, they show poor lightfastness. It restricts the use of basic dyes in versatile applications.
The introduction of acrylic fibers made them relevant. On the acrylic fibers, they show a reasonably good life fastness.
It is quite apparent that the use of basic dyes is not recommended for hand dying because of their affinity to proteins. The long-term use can cause serious health hazards.
Acid dyes are based on salts of phenolic, sulfuric or carboxylic acids. The dyes are soluble in water and show an affinity towards all types of fibers. The pH value of them lies between two and five.
Since they are highly water soluble, the light fastness of acid dye is better than basic dye. They are appropriate for all natural and synthetic fibers.
Acid dyes are negatively charged, and they are divided into two groups acid-leveling and acid-milling. The chemical structure of these dyes is made from large aromatic molecules with a sulphonyl or amino group that makes them soluble in water.
Properties of acid dyes
The dyes form a large anion when they dissolve in water. They are ideal for dying silk, wool, polyamide, and acrylics.
Their pH value ranges from extreme acidic to neutral. Acid dyes are not suitable for dying cotton fabric as they don’t show any affinity to cotton cellulose.
Sagar Colour Co. is one of the foremost modified dyes manufacturers, stockist of Cationic and Acrylic Dyes as well as leading dye suppliers in India. As textile specialty chemicals suppliers Sagar Colour Company in Surat will be renowned globally as a prime acrylic dyes manufacturers and cationic dyes manufacturers.