Classification is based on the application object of the dye, the dyeing method of the dye, the application performance and the combination form with the dyed substance, etc.
(1) Acid dyes and acid combined dyes Acid dye molecules contain acidic groups such as sulfonic acid groups and protecting groups, or Organic salt. The dyeing process must be completed in an acidic or neutral dye bath, and is mainly used for dyeing protein fibers and polyamide fibers. During dyeing, the acidic group of the dye combines with the propanol or amide group in the fiber structure to dye the fiber. After some dyes are treated with metal mordants, they can form metal combinations in the fibers and be fixed on the fibers.
(2)Alkali Sex dyes The dye molecules contain basic groups, such as amino groups or substituted acyl groups, which can form salts with the rib groups on protein fibers for direct dyeing.
(3) Direct dye molecules contain acidic water-soluble groups and are mainly used for dyeing cellulose fibers. During dyeing, hydrogen bonds are formed between dye molecules and cellulose molecules.
(4) Sulfur dyes Sulfur dyes are insoluble in water. Because they need to be dyed in sulfide alkali solution, they are called sulfur dyes. . Mainly used for dyeing cotton fibers.
(5) Neutral dyes Neutral dyes are metal complex dyes because they are in a nearly neutral dye bath It is dyed, so it is called neutral dye. Used for dyeing vinylon, silk, silk, wool, etc.
(6) Ice dye Ice dye consists of diazo component and coupling component, and the two react on the fiber Formation of insoluble azo dyes. Since ice is used under cooling conditions during dyeing, ice dyeing is mainly used for dyeing cotton fibers.
(7) Vat dyes This type of dye is insoluble in water and can be reduced to It is dyed with soluble leucosomes. After oxidation, the leucosomes are transformed into water-insoluble dyes in the fiber. It is mainly used for dyeing cellulose.
(8) Indigosol and lysine are soluble vat dyes, mainly used for cotton printing, and a small amount for silk and wool dyeing.
(9) Reactive dyes have reactive groups in their molecular structure, which chemically combine with the hydroxyl or amino groups on the fiber molecules during dyeing, so they are called reactive. Dyes or reactive dyes are mainly used for the printing and dyeing of cotton, linen, silk and other fibers, and are also used for dyeing wool and synthetic fibers.
(10) Disperse dyes do not contain water-soluble groups in the dye molecules and need to be ground in the presence of a dispersant to make the dyes into Very fine particles are dispersed in water for dyeing, so they are disperse dyes. They are mainly used for dyeing hydrophobic synthetic fibers (such as polyester, nylon, acetate, etc.).
(11) When dyeing with cationic dyes. This type of dye is soluble in water and combines with the dyed fibers in the form of cations. , so it is called a cationic dye. Mainly used for dyeing wax fiber.
(12) Other dyes such as food dyes, leather dyes and the developing polypropylene dyes , fluorescent dyes, etc.
