Environmental protection instant dyes have higher immediacy to cellulose fibers than other dyes. This is mainly because the content of the immediate dye is large, the molecular formula is linear, the symmetry is good, the conjugate system is long, the coplanarity is good, and the van der Waals force between the molecular structure of the dye and the chemical fiber is large. In addition, there are functional groups such as hydroxyl, methyl and formamide in the molecular structure of the immediate dye, which can form covalent bonds with the methyl groups in cellulose fibers and the methyl groups and hydroxyl groups in protein fibers to further improve the dye.

Immediate dyeing principle The dyeing principle of immediate dye includes the following basic whole process: 1. Absorption (absorption): The chemical fiber absorbs the dye from the beam liquid and diffuses to the inside and outside of the chemical fiber. 2. Contact inhibition (color retention): chemical changes between dyes and chemical fibers are converted into covalent bonds. 3. Water cleaning: The dyes that are not inhibited by contact are washed away from the chemical fiber.