Tuesday, 28 April 2015

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Mordant Dye

Mordant Dye

Mordant Dye
Mordant Dye
Mordant Dye are corrosive dyes that have extraordinary destinations other than corrosive salt anion aggregates that can respond with a metal salt stringent. Mordant dye are "perfectly customized" to chelate with metal particles to frame a solid organometallic complex of constrained dissolvability and more prominent colorfastness. The fiber may be dyed at first and afterward mordanted (postmordanting), dyed and mordanted all the while (comordanting), or mordanted and after that dyed (premordanting) . Of the three strategies, postmordanting is favored. Salts of chromium, aluminum, copper, iron, tin, and cobalt are normally utilized as mordants. Since the stringent influences the electron circulation and thickness inside the dye, the shading of the dyed fabric has a tendency to change.

Properties of Mordant Dye:

1. Mordant Dye are efficient colors and are for the most part used to deliver dim shades, for example, dim greens , dull soul and blacks.

2. Mordant Dye have great leveling and shading speed properties.

3. The collaboration in the middle of fiber and color is secured through exceptionally solid ionic bonds , which are framed between the anionic gatherings of the colorant and ammonium cations on the fiber. Chromium or the metal particle goes about as scaffold between the color and fiber , which offers ascend to an extremely solid linkage , coming about into magnificent quickness properties.

However there are hindrances of the chrome colors additionally, for example, longer coloring cycles, troubles in shading , danger of compound harm to the fiber and the potential arrival of chromium in the waste water.

System of  Mordant Dye: 
Since mordant dyes are an extraordinary class of corrosive colors , which are dissolvable in water and connected to the fiber from an acidic shower. At the point when an answer of a corrosive stringent color is blended with an answer of potassium dichromate in the vicinity of sulfuric corrosive , chromium particle from dichromate shapes a complex with the colors , this mind boggling is insoluble in water ,and thus encourages on the fiber.

There are three distinct strategies for utilization of chrome colors on the fiber,

Chrome – Severe technique of Mordant Dye

After chrome system of Mordant Dye

Meta chrome system of Mordant Dye

Utilization of Severe Colors for Mordant Dye

Chrome-Severe Procedure of Mordant Dye
In chrome severe procedure, the fiber is initially treated with potassium dichromate in the nonpartisan shower or in the vicinity of either sulfuric or formic or oxalic corrosive. At the point when adequate measure of chromium is taken up by fiber , it is taken out , pressed and entered in the color shower containing corrosive stringent color. The color shape an insoluble complex with chrome exhibit on the fiber .

After Chrome System of Mordant Dye
In this system the substrate is initially treated with the color , the color is depleted by the expansion of a corrosive , and after complete depletion the material is taken out pressed and afterward run in an answer containing potassium dichromate and a corrosive. Metal color complex is shaped on the fiber , which is insoluble.

Meta Chrome Process for Mordant Dye
This is a solitary bath process , in which the material is treated with in a shower containing corrosive severe color , potassium dichromate and ammonium sulfate.

The color alongside potassium dichromate and ammonium sulfate got consumed by the fiber and uniformly dispersed however no perplexing is shaped in light of the fact that the pH is not suitable for the substance response to happen.

In the second venture of the meta chrome process, when the color shower is warmed , ammonium sulfate is believers into alkali and sulphuric corrosive , which makes the shower unequivocally acidic and potassium dichromate in the vicinity of solid corrosive now respond with the color particle shaping an insoluble complex on the fiber.


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