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The History and Classification of Disperse Dyes

The history of Disperse Dyes:
Disperse Dye is a kind of slightly soluble in water, take in the water and dispersant is highly dispersed state of the dye. Disperse Dyes don’t contain a water soluble group, and the molecular weight is lower, although molecules containing polar groups ( such as hydroxy, amino, alkylamino, hydroxy, cyano alkyl amino ), and still belong to non-ionic dye. After high processing requirements of these dyes, usually requires the presence of the dispersant was grinding machine, a highly decentralized in order to use the stable crystalline particles. The Disperse Dye is uniform and stable suspension. Disperse Dyes began to product in 1922 by the German Baden Aniline Soda Company, and mainly used for Polyester Fibers and Acetate Fiber dyeing, which was mainly used for Dyeing Acetate Fibers. After the 1950s, with the advent of Polyester Fibers, gained rapid development, it has become the dye industry category of products. Disperse Dyes can be classified according to the molecular structure of azo, anthraquinone and heterocyclic categories. Azo-based agent representing the whole chromatogram, there are various color, such as yellow, orange, red, purple, blue and so on. Azo dyes according to the general method of producing synthetic Azo dyes, simple process, low cost. Anthraquinone type with red, purple, blue and some other colors. Heterocyclic type is a newly developed dye, with colorful features. The production process of Anthraquinone Dyes and Heterocyclic type Disperse Dyes are much more complex and with higher costs.
The classification of Disperse Dyes:
According to the heat resistance when applied by different typed, Disperse Dyes can be divided into low temperature, medium temperature and high temperature.
Low-temperature Disperse Dyes:
It has low resistance to sublimation fastness, good dyeing properties, and is suitable for exhaust dyeing, often referred to as E-type dye.
High-temperature Disperse Dyes:
It has high resistance to sublimation fastness, but poor levelness, suitable for hot melt dyeing, and often referred to as S-type dye.
Medium-temperature Disperse Dyes:
The sublimation fastness resistance is between the low-temperature Disperse Dyes and high-temperature Disperse Dyes, and often referred to as SE-tyepe dye.
When using Disperse Dyes for Polyester Dyeing, basis having different dye staining method to choose.