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how dyes attach themselves to fabrics
May 29, 2018

Why do dye have color? Founded in 1876, German chemist Witt the dye chromophore theory. Sweet that can cause organic molecules in the uv region and has strong suction light visible light zone groups of atoms or groups, called chromophores (basement, chromophore). Such as containing azo, carbon - carbon double bond double bond, carbon, oxygen, nitrogen, oxygen anion groups, contain a double bond, stimulate the send key electron energy is lower, the absorption bands in the ultraviolet and visible light range. If the molecules containing only a chromophores, in 200-200 nm absorption wavelength of light, still cannot send lubricious; If there are two or more chromophore in molecular conjugate, due to electron delocalization effect in the conjugate system of the excitation energy are lower than those of single send key, absorb visible OuDeGuang, object rendering color. Also some of the group itself absorption bands in the ultraviolet region, cannot make objects to colors, but if these groups received the above chromophores, makes chromophores absorbing wavelength moving towards long wave, this call auxochrome group. What we call the dye is mainly for textile fibers. If a dye color is good, but you can't make the fabric dyeing, cannot be dye; Likewise if a fibrous structure can not absorb dye, it is difficult to become a textile fiber, also cannot become a clothing and cloth. Dye can make the fabric dyeing, depending on the chemical structure of dyes and fibers, how the affinity between them, it is the basic factor of the fiber and fabric dyeing. Dye fabric dyeing process, adsorption process, one kind is adhered by fiber adsorption of dye and make the dye on the fiber, forming complexes dye fibers; Combined process, the second is because of fabric fiber acid alkali and dyes, acid alkali, combined with each other, reaction to generate salt formed fixed on the fabric color. A good dye fabric after dyed bright colors; Durable and does not change color; Chemical stability very not decoloring; Don't make the fabric aging metamorphism. Especially the resistance to water and light.


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