Dye :
In textile industry, a dye is a substance used to color fibers, yarns, or fabrics by penetrating the fiber and creating a chemical bond with it. Dyes can be classified into different categories based on their chemical structure, such as acid dyes, basic dyes, reactive dyes, direct dyes, and disperse dyes.
Each type of dye has specific properties and is suitable for certain types of fibers, colors, and dyeing processes. For example, acid dyes are used for wool, silk, and nylon, while disperse dyes are used for synthetic fibers like polyester and acetate. Reactive dyes are used for cellulosic fibers like cotton and rayon, while direct dyes are used for cotton, rayon, and other natural fibers.
| Chemical Constitution of Disperse Dye | Download |
| Cellulosics Colouration – reactives | Download |
| Ecology-and-Toxicology-of-dyes-and-pigments | Download |
| dyes_pigmens.SR | Download |
| Non textile applications of dyes and pigments | Download |
| Polyester Colouration | Download |
Disperse dyes are a type of dye used for coloring synthetic fibers such as polyester, nylon, and acetate. They are called “disperse” because they are insoluble in water and must be dispersed in a carrier liquid, such as a dispersing agent, to achieve uniform coloring of the fibers.
The chemical constitution of disperse dyes typically includes an aromatic ring or multiple aromatic rings, along with one or more azo or anthraquinone chromophores. The chromophores are responsible for the color of the dye, while the aromatic rings provide stability and solubility.
Disperse dyes can be classified into two major groups: azo dyes and anthraquinone dyes. Azo disperse dyes contain one or more azo chromophores, which are nitrogen-containing compounds that absorb light in the visible range, while anthraquinone disperse dyes contain anthraquinone chromophores, which are oxygen-containing compounds that also absorb light in the visible range.
Disperse dyes are widely used in the textile industry due to their excellent lightfastness, washfastness, and heat resistance. They are also relatively easy to apply and produce bright, vivid colors. However, their use is limited to synthetic fibers, as they do not bond well with natural fibers such as cotton or wool.
