reactive dye is only class of dye which makes co-valent bond with the fiber and become a part of it. The co-valent bond is formed at alkaline condition.
Fibre + reactive dye Þ Fibre dye
(Nacl & Na2So4) Covalent 6ond
Properties of reactive dyes:
(1) An – ionic in nature.
(2) Soluble in water and a certain amount (10.40%) in hydrolyzed during dyeing.
(3) Form strong co-valent with the fibers and applied in cellulosic fibre.
(4) Better light and weathering fastness properties.
(5) Have better substantivity.
(6) Dyeing in carried out at alkaline condition.
(7) Electrolyte is necessary for exhaustion of dyes in the fibre
Influencing factor:
(1) pH (³10-12).
(2) Temperature (300-800C)
(3) Concentration of Salt (40 g/L – 100 g/L)
(4) Time of dyeing.
(5) M:L Ratio (1: 7/8/10)
Widely used reactive dyes:
(1) Cabacron R- dyes
(2) Livafix R- dyes
(3) Remazol R- dyes
(4) Procion R – dyes
(5) Drimarine R- dyes
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