Pramukh Industries

  • All this is being achieved without any compromise on quality. Gone are the days when no dyestuff Company Used to give any guarantee on good produced by it. Pramukh takes a big, bold & Pioneering step, to increase its customers confidence, by giving guarantee in the consistency of quality of dyestuff supplied. For achieving that purpose, Pramukh has installed highly technological machines, like SPECTROPHOTOMETER, COLOUR MATCHING SYSTEM, LIQUID TESTING, MOOLLER etc. for testing the strength and various other parameters of its products. This start of art technology is available with only few companies throughout India.

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Acid dyes

Pramukh Industries

Posted on : 29 Mar 2024 01 : 30 : 01 am

By : pramukhindustries@rediffmail.com

Acid dyes

Acid dyes are highly water soluble, and have better light fastness than basic dyes.The textile acid dyes are effective for protein fibers such as silk, wool, nylon and modified acrylics. They contain sulphonic acid groups, which are usually present as sodium sulphonate salts. These increase solubility in water, and give the dye molecules a negative charge. In an acidic solution, the -NH2 functionalities of the fibres are protonated to give a positive charge: -NH3+. This charge interacts with the negative dye charge, allowing the formation of ionic interactions. As well as this, Van-der-Waals bonds, dipolar bonds and hydrogen bonds are formed between dye and fibre. As a group, acid dyes can be divided into two sub-groups: acid-leveling or acid-milling.