Classification of Reactive Dyes

Reactive dyes may be classified in various ways as below:

1) On the basis of reactive group:
a) Halogen (commonly chlorine) derivatives of nitrogen containing heterocycle, like 3 types-

  • Triazine group
  • Pyridimine group
  • Quinoxaline dyes
Example:

Triazine derivatives: procion, cibacron.
Pyridimine derivatives: reactone
Quinoxaline derivatives: levafix.

b) Activated vinyl compound:

  • Vinyl sulphone
  • Vinyl acrylamide
  • Vinyl sulphonamide.
Example:

Vinyl sulphone: remazol
Vinyl acrylamide: primazine
Vinyl sulphonamide: levafix.

2) On the basis of reactivity:

a) Lower reactive dye: Here ph is maintained 12-12.5 by using NaOH in bath.
b) Medium reactive dye: here pH is maintained 11-12 by using Na2CO3 in dye bath.
c) Higher reactive dye: here pH is maintained 10-11 by using NaHCO3 in dye bath. 

3) On the basis of dyeing temperature:

a) Cold brand:
These types of dyes contain reactive group of high reactivity. So dyeing can be done in lower temperature i.e. 320-600C.
 

For example: PROCION M, LIVAFIX E.

b) Medium brand:
This type of dyes contains reactive groups of moderate reactivity. So dyeing is done in higher temperature than that of cold brand dyes i.e. in between 600-710C temperatures.

For example, Remazol, Livafix are medium brand dyes.

c) Hot brand:
This type of dye contains reactive groups of least reactivity. So high temperature is required for dyeing i.e. 720-930 C temperature is required for dyeing.

For example PRICION H, CIBACRON are hot brand dyes. 

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