Reactive Dyes

Reactive Dyes

 

(also fiber-reactive dyes), a class of dyes developed between 1952 and 1955. Reactive dyes form covalent chemical bonds with hydroxyl groups when dyeing cellulosic fibers and covalent chemical bonds with amino groups and certain other groups when dyeing protein and polyamide fibers.

The molecules of a reactive dye contain a chromophoric system, which accounts for the dye’s bright, intense color, and a fiber-reactive group, which ensures chemical reaction between dye and fiber. Reactive dyes with highly varied fiber-reactive groups (more than 25) have already found application in industry. Monochloro-symm-triazine and dichloro-symm-triazine often act as reaction groups. In such cases, the reactive dye takes part in the following substitution reaction with ionized cellulose (ZO):

The chromophores (XC) in reactive dyes are primarily azo dyes, anthraquinone dyes, and phthalocyanine dyes. Reactive dyes are available in all colors and are noted for their brightness and excellent fastness. They are widely used for dyeing and printing materials made of cotton, regenerated cellulose, wool, natural silk, and polyamide fiber.

REFERENCE

Krichevskii, G. E. Aktivnye krasiteli. Moscow, 1968.

M. A. CHEKALIN

References in periodicals archive ?
Maximum share of imports constitutes p-Xylene (an important chemical feedstock), polypropylene (a thermoplastic polymer used in a wide variety of applications), reactive dyes and preparations based thereon, pharmaceuticals and tea, respectively.
In the case of sustainable solutions for the dyeing process, CHT is a reliable partner, too: with BEZAKTIV GO they offer sustainable reactive dyes that achieve the highest quality and colour intensity.
These reactive dyes give the best results for dyeing plant fibers.
Microbial process for the decolorization of textile effluent containing azo, diazo and reactive dyes. Process Biochem, 1996; 31: 435-442
Kinetics of the reaction was studied under the effect of concentration of reactive dyes, concentration of oxidant were followed under pseudo first order condition and found to influence the catalytic mechanism.
Reactive dyes have good technical characteristics, but they have been found to cause adverse effects on workers in textile factories and on the environment.
Key words: Bio-sorption, Reactive dyes, Textiles effluents, Typha latifolia and Drimarene Blue K2RL.
"Application of modified bagasse as a biosorbent for reactive dyes removal from industrial wastewater," J.

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