Dyestuff dye and pigment in textile:
Table of Contents
Dyestuff:
Dyestuff is a substance that contains the Chromophore group and the Auxochrome group and which, when applied to an object, changes the physical and chemical properties of that object and shows the color when the object is reflected by light rays.
Dyestuff dye and pigment in textile-Dye:
Dye is a chemical that contains chromophore and Auxochrome groups and is used to dye fibers, yarns, fabrics, and textiles. In other words, die is a complex unsaturated organic compound that has certain properties. Such as-
(i) coloring ability
(ii) solubility
(iii) gravity
(iv) durability etc.
Dye molecules usually enter the fiber and are attached by chemical energy or addiction. If a substance is to be a textile dye, its molecules must have the ability to penetrate the inside of the fiber very quickly. The fiber must enter the polymer system and the dye molecules inside the polymer system must either be firmly attached or securely trapped, or chemically reacted with the fiber polymer.
Note that to meet the above conditions, the die molecules must be dissolved in water or any other solution to facilitate its rapid penetration with the fiber. After the dyeing process is over, the dye molecules need to stick to the fiber even after the dye solution has dried to maintain the durability of the dye.
Pigment:
Pigments are substances in which the chromophore and Auxochrome group does not exist and which, when applied to an object, do not change its physical and chemical properties. The pigment does not have the Oxo chrome group, this pigment is also a kind of coloring object. This pigment cannot penetrate the fiber. However, by resin binder on the surface of their fiber can be kept connected.
Properties of dyes:
Dye is a complex unsaturated aromatic organic compound that has certain properties.
A) Intense color:
The dye should have a maximum tectorial effect. The tectorial value depends on the nature of the two in Chromophore& Oxo chrome. Of these, the chromophore is the color-bearing group and Oxo chrome is the color-enhancing group.
B) Solubility:
It is the ability to dissolve in water or any solvent. Cannot be applied to textile products without dissolving the dye. So each type of dye has to be dissolved in some solution or liqueur.
C) The power of attraction:
It is addictive to textile products. The dye enters the dyed fiber from the bath for the sake of attraction. Attraction and addiction are indeed compatible. Attraction can be measured by addiction. Sodium Hydrosol Fide or soda ash is used as an additional agent to substantiate naphthalene, VAT, sulfur dye.
D) Fastness:
Colorfastness is a resistance that protects dyeing and printing from a variety of effects. There are Different types of fastness in the textile industry. Such as light fastness, washing fastness and rubbing fastness, etc.
Dyestuff dye and pigment in textile-Classification of dyestuff:
Dyestuffs can generally be classified in three ways, e.g.
A) Physical classification
B) Chemical classification
C) Classification according to application
Dyestuff dye and pigment in textile-A) Physical classification:
Naturally, dyestuff can be divided into three parts. E.g.
1) Paste form
2) Lump form
3) Powder form
Dyestuffs in the form of top paste and lamps are not so prevalent in the market. However, it is available in powder form. The powder form can be further divided into three parts
1) Grain form
2) Fine powder form
3) Micro or ultrafine powder form
B) Chemical classification:
B) Chemical classification:
1) Nitroso dyes
2) Nitro dyes
3) Azo dyes
4) Stilbene dyes
5) Diphenylmethane dyes
6) Triphenylmethane dyes
7) Xanthene dyes
8) Acridine dyes
10) Methine dyes
11) Thiazole dyes
12) Azine dyes
13) Oxazine dyes
14) Thiazine dyes
15) Anthraquinone dyes
16) Indigoid dyes
17) Phthalocyanine dyes
18) Azoics dyes
C) Classification according to application:
Dyestuffs can be divided into the following categories based on the application method.
1) Direct dye
2) Acid dye
3) Basic dye
4) Reactive dye
5) Vat dye
6) Azoic dye
7) Aniline dye
8) Sulfur dye
9) disperse dye
10) Mordant dye
11) Mineral Khaki Dye
12) Rapid &Rapidogen dye
13) Onium dye
