STUDY OF THE PROCESS OF COLD DYEING OF WOOL FIBER USING DIAZONIUM NANO-SALTS

The article discusses a method of cold dyeing of wool fiber with insoluble azo dyes using diazonium salt nanoparticles. The azo component used is a nanodispersed diazonium salt, in combination with the reactivity of the side radical of the tyrosine amino acid of the keratin macromolecule, which ensures the effective occurrence of the azo coupling reaction directly in the fiber structure. Dyeing is carried out at a temperature of 20–25°C for 15–20 minutes with a bath module of 1:50. The effect of pH in the range of 4–8 on the physical, mechanical, and coloristic properties of wool was studied. It has been established that the proposed method ensures the production of stable and intense coloration while maintaining the fiber structure and reducing the energy and labor costs of the process.