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dyestuff

2019-05-22

Dyes refer to a group of organic compounds that can give other substances a bright and firm color. Because the pigments used nowadays are synthetic, they are also called synthetic dyes. Dyes and pigments are usually compounds with their own colours and can give other substances bright and firm colours in molecular or dispersed states.


Dyestuffs can be classified as follows by dyestuffs manufacturers according to their properties and application methods.


By state


Water-based color paste Oily color paste Water-based color essential oil color concentrate


By use


Ceramic Pigment Paint Pigment Textile Pigment Plastic Pigment


By source


Natural dyes are plant dyes, animal dyes, synthetic dyes (also known as artificial dyes) according to their usage


According to the properties and application of dyes


Direct Dyes Insoluble Azo Dyes Reactive Dyes Reductive Dyes Soluble Reductive Dyes Sulfur Reduction Dyes Phthalocyanine Dyes Oxidative Polycondensation Dyes Disperse Dyes Acidic Dyes and Acidic Medium-containing Dyes Basic and Cationic Dyes


Direct dyes


This kind of dyestuff can be directly dyed on cotton, hemp, silk, wool and other fibers without relying on other medicines. The dyeing method is simple, the chromatogram is complete and the cost is low. However, the fastness to washing and sunshine is poor. If proper post-treatment is adopted, the fastness of dyed products can be improved.


reactive dye


Also known as reactive dyes. This kind of dyestuff is a new type of dyestuff developed only in the 1950s. Its molecular structure contains one or more active groups. Under appropriate conditions, it can react with fibers to form covalent bonds. It can be used for dyeing cotton, linen, silk, wool, viscose, nylon, vinylon and other textiles.


Sulfur dyes


Most of these dyes are insoluble in water and organic solvents, but they can be dissolved in alkali sulfide solution and dyed directly after dissolution. But because the dye solution is too alkaline, it is not suitable for dyeing protein fibers. This kind of dyestuff has the advantages of homogeneous chromatography, low price, good color fastness, but not bright color.


Disperse dyes


This kind of dyestuff has low solubility in water and fine particles. It is dispersed in dyeing solution and belongs to non-ionic dyestuff. It is mainly used for dyeing polyester fibers. Its dyeing fastness is high.


Acid dyes


These dyes are water-soluble and contain water-soluble genes such as sulfonate and carboxyl groups. Protein fibers can be dyed directly in acidic, weak acidic or neutral media, but the fastness to wet treatment is poor.


coating


Suitable for all fibers, through resin mechanical attachment fibers, dark fabrics will harden, but the color set is very accurate, most of the light fastness, washing fastness is good, especially in medium and light colors.


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