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Home » Dyestuff » Reactive Dyes

Reactive Dyes

Reactive Dyes
Reactive Dyes offered by us form covalent bonding between dye and fiber and contain reactive group that is often trichlorotriazine (either halo heterocycle/activated double bond) which when applied to fibre in alkaline dye bath helps in forming chemical bond with hydroxyl group on cellulosic fibre. In reactive dyes, chromophore contains substituent which is activated and allowed to react directly to surface of substrate.

Being the most important method for meeting the coloration needs of cellulosic fibres, these dyes can also be applied on:
  • Wool
  • Nylon

While applying on nylon, these are applied under weakly acidic conditions. Having low utilization degree in comparison to other types of dyestuff, reactive dyes also bonds to water, creating hydrolysis.

Reactive dyes are categorized by functional group:
Functions Fixation Temperature Included in Brands
Monochlorotriazine Halo heterocycle 80° Basilen E & P Cibacron Procion H, HE
Monofluoro Chlorotriazine Halo heterocycle 40° Cibacron F & C
Dichlorotriazine Halo heterocycle 30° Basilen MProcion MX
Difluoro Chloropyrimidine Halo heterocycle 40° Levafix Drimarene K & R
Dichloroquinoxaline Halo heterocycle 40° Levafix E
Trichloropyrimidine Halo heterocycle 80-98° Drimarene X & Z Cibacron
Vinyl sulfone activated double bond 40° Remazol
Vinyl amide activated double bond 40° Remazol

Advantages of Reactive Dyes:
  • Show improved fastness properties
  • Simplify dyeing procedure
  • Easy Wash-ability
  • Permanency of the color
  • Good chemical binding
  • Allows variety of chromophores to be used

Dyeing cycle and Important factors/phases in Reactive Dyeing:
  • pH of the substrate prior to dyeing
  • pH of the dye bath
  • Pretreatment of the substrate
  • Solubility of the dyestuff
  • Dyeing temperature
  • Quality of water and salt
  • Electrolyte concentration
  • Dyeing time
  • Washing off sequence
  • Type of alkali

Types of Reactive Dyes:
Bi-functional Dyes:
The dyestuffs that contain two groups are known as bi-functional dyestuffs. Here, reactive dyes are constituted in a way to have capacity to react with fibre in more than single way.

Vinyl Sulphone Dyes (VS):
These dyes are moderately reactive and have dyeing temperature of generally 600C and pH of 11.5. These are applied by utilizing mixture of soda ash and caustic soda and show excellent fixation properties under proper alkaline conditions.

Monochlorotriazine Dyes (MCT):
These are less reactive than vinyl sulphone dyes where reaction takes place in conditions that are more energetic like conditions of typically 800 degree C and pH value of 10.5, which is essential for achieving proper fixation on cellulosic fibres.
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