Reactive Dyes Manufacturer In India Process

History: 

An announcement of great technical and commercial importance appeared in the journal of the society of dyers and colorists (1956, p55) under the column “Manufacturers Publications & Pattern cards” This concerned a circular on procion dyes (ICI) deseribing Procion Yellow R, Procion Brilliont Red 2B and Procion lue 3G all belonging to a new eloss (called reactive) of dyes, since the fixation to the fibre is achieved by direct chemical linkage.

Introduction (Detonation):

Reactive dyes manufacturers are water soluble dyes containing sulphonic acid groups and reactive groups like dichloride or monochloro tniazinyl groups or sulplato ethyl sulphone groups (from which vinyl sulphone reactive groups are formed during dyeing in the presence of an alkali)
The reaction of these dyes with the functional groups of the fibre is brought about by alkali such as sodicens carbonate, hydroxide, silicate etc. Reactive dyes from covalent bond with the fibre and becomes a part of the fibre. This type of dye has some reactive group which can react with –OH group of ccllulose and –NH2 group of proteins fibres. Due to this fact, these dyes are known as reactive dyes.

Classification of reactive dye:

A) Reactive dyes can be classified chemically into two groups:

i) Halogenated hetero cycles Eg> Tri chloro Triazine Tetrachloropyrinmidine.

ii) Activated vinyl compounds: Eg>D-So2-CH=CH2, vinyl sulphone is another commercially successful reactive group used in the manufacture of reactive dyes, Remeizol dyes belongs to this group.These dyes are marketed as sulphate ethyle sulphone dyes and may be repesented by D-S-G-X where u is –CH2-CH2-OSO3Na G is So2, S is the solubilizing group and D is the chromogenic part.

B) On the basis of reactivity reactive dyes can be divided into three groups:-

i) High reactive dye: This type of reactive dyes contains two chlorine atoms and portion-M dyed of dyes fall under this group. In dyeing with this class of dyes weak alkali like NaHCO3 is used.

ii) Moderate reactive dyes: Dyeing with this type of dye medium alkali (Na2co3) is used lavafix E falls under this class.

iii) Low reactive dye: strong alkali (NaOH) is used in this types of dyes. This type of dyes contain on chlorine atoms.