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what is disperse dyes
Aug 24, 2018

Disperse dyes are a class of dyes that are relatively small in molecular structure and have no water-soluble groups. It is necessary to dye the fibers such as polyester by uniformly dispersing the dye in the dyeing solution by means of a dispersing agent. The main use of disperse dyes is to dye polyester fiber (polyester) acetate fiber (diacetate, triacetate) and polyamide fiber (nylon) in chemical fiber, and also to small amount of polyacrylonitrile (acrylic fiber). The chemical fiber textile products processed by disperse dye printing have bright color, excellent washing fastness and wide application. Because it is insoluble in water, it has no dyeing ability on cotton, hemp, wool and silk in natural fiber, and almost no staining on viscose fiber. Therefore, chemical fiber blended products usually need to be used together with disperse dyes and other suitable dyes.

The disperse dye molecules are small, structurally free of water-soluble groups, and dyed by uniform dispersion in the dye liquor by the action of a dispersing agent. It can dye polyester fiber, acetate fiber and polyamide fiber to become a special dye for polyester.

Disperse dyes can be roughly divided into disperse orange, disperse blue, disperse yellow, and disperse red. It can be mixed in a certain proportion with several different disperse dyes to obtain disperse dyes such as disperse black, disperse green, and disperse violet.

In the process of commercial processing of disperse dyes, in order to enable the commercial dyes to be rapidly dispersed in water to form a uniform and stable colloidal suspension, the fineness of the dye particles must be about 1 micron, and a dispersant and a wetting agent are added during the sanding process to disperse. The post-treatment of dyes generally consists of sanding, seasoning, spray drying, and packaging. A lot of auxiliaries are used in the post-treatment process, such as lignin, MF, anti-settling agent (SOS), dustproofing agent, dispersing agent NNO, and adding Yuanmingming powder to adjust the strength.

Disperse dyes are one of the most important and major types in the dye industry. They do not contain strong water-soluble groups and are a class of nonionic dyes that are dyed in a dispersed state during dyeing. The particle fineness is required to be around 1 μm. After the raw dye is obtained, it is subjected to post-treatment processing, including crystal form stabilization, and commercial treatment with a dispersing agent, to obtain a commercial dye. Mainly used for printing and dyeing polyester and its blended fabrics. Can also be used for the printing and dyeing of synthetic fibers such as acetate, nylon, polypropylene, chlorin, acrylic.

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