Reactive Dyes
Reactive Dyes

Reactive Dyes

Reactive dyes have a halogen-containing reactive group present in their structure and become an integral part of the fiber structure by creating a covalent bond. This is the type that is mostly used for dyeing cotton fabrics.

 

Properties:

1. These types of dyes are water-soluble and anionic

2. Fixed into the fiber using a covalent bond

3. Exhibit good wash, lightfastness, and moderate rubbing fastness

4. Requires alkaline conditions and the use of electrolytes

 

Mechanism:

This type of dye consists of three stages of mechanism:

  1. Exhaustion: With the help of electrolytes
  2. Fixation: With the help of alkaline
  3. Washing-off: With the help of a soaping agent

 

Reaction:

it will generate two types of reaction as Nucleophilic Substitution Reaction and Nucleophilic Addition Reaction.

 

Applications: cotton, but protein and polyamide can also be dyed.