Reactive Dye

By three basic units, all reactive dyes are made up. These three basic units are chromophore, a bridge and reactive group/groups. To dye cellulosic fibers these dyes are used. Here formed a covalent bond with hydroxyl group of the fiber by chemically reacting with fiber when these applied to a cellulosic fiber in an alkaline dye bath.
Types of Reactive Dyes: Basically reactive dyes are three types which are classified as per the functional group present,
  1. Mono functional reactive dyes.
  2. Bi functional reactive dyes.
  3. Poly functional or multifunctional reactive dyes.
Properties of Reactive Dyes: The properties of reactive dyes are given below,
  1. Reactive dye is anionic in nature.
  2. Reactive dye is water soluble dye.
  3. They have better wash and light fastness properties.
  4. They have better substantively.
  5. They form strong co-valiant bond with the cellulosic fiber.
  6. Alkaline condition is must required for dyeing.
  7. Electrolyte is must for exhaustion of dyes in the fiber.
  8. A certain amount of dyes are hydrolyzed during application.
  9. Wide range of color can be produced with reactive dyes.
  10. Comparatively cheap in price.

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