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 ?
Summary: Two new series of azo reactive dyes containing labile chlorine atoms have been synthesized.
Our ECOINKA(r)R inks are formulations made from highly purified reactive dyes for digital printing of cellulosic fabrics like cotton, viscose and protein fibres like silk.
Reactive dyes have good technical characteristics, but they have been found to cause adverse effects on workers in textile factories and on the environment.
Removal of reactive dyes from aqueous solutions using combined coagulation/flocculation and adsorption on activated carbon.
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.
Huddersfield also made the world's first fibre reactive dyes, Procion, Disperse and Nylomine, which revolutionised cloth printing and fabric design.
After the above mentioned pretreatments the fabric samples were dyed with reactive dyes using the dyeing recipe as given below:
Many researchers have focused on utilization of coal fly ash for manufacturing of potassium fertilizer, zeolite, cement, flue gas adsorbent concrete, raw material for road structure and bricks making, reactive dyes, adsorption of phenolic compounds, organic compounds, heavy metals and organic pollutants from industrial flue gases and effluents.
Chairman & MD, Shree Pushkar Chemicals & Fertilisers Ltd, Punit Makharia, "As a part of our forward integration strategy, we plan to venture into reactive dyes manufacturing with a plant having a capacity of 3000 tonnes a year.
Decolorization of some reactive dyes by white rot fungi isolated in Pakistan, World Journal of Microbiology and Biotechnology.

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