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Definition And Classification Of Dyestuff Industry
Oct 15, 2018

Dyestuff is a substance that can stain fibers and other materials. It is divided into two categories: natural and synthetic. Dyes are colored substances. But colored substances are not necessarily dyes.
    Dyestuff is a substance that can make certain colors attached to fiber, and it is not easy to fall off and discolor. Dyes are usually dissolved in water, and some of the dyes require mordant to bind the dye to the fibers.

Archaeological data show that dyeing technology has been in India and the Middle East for over 5000 years. The dye came from plants and minerals at the time and was rarely processed.
    The classification of dyestuff industry can be classified according to the nature and application of dyes.
According to the state of water-borne color paste, oil-borne color paste, water-borne color, oil-borne color essence, water-borne color, water-borne color, oil-borne color, water-borne color, pigment, textile pigment, plastic pigment, natural dye, animal dye, synthetic dye (also known as artificial dye), direct dye, insoluble azo dye, activity, according to the nature and application method of dye Soluble VAT dyes, sulfur-reducing dyes, sulfur-reducing dyes, phthalocyanine dyes, oxidizing dyes, polycondensation dyes, polycondensation dyes, disperse dyes, acid dyes, acid mordant dyes, alkaline dyes and cationic dyes, direct dyes, which do not depend on other agents, can be directly dyed on cotton, linen, silk, wool, etc. All fiber is named after it. Its dyeing method is simple, chromatography is complete, and the cost is low.

However, the fastness to washing and sunlight is poor. If proper post-treatment is adopted, the fastness of dyed products can be improved. The chromic gold containing dye - qinzhu pigment reactive dyes, also known as reactive dyes. These dyes are new dyes developed in 50s. Its molecular structure contains one or more active groups, under appropriate conditions, can react with the fiber to form covalent bonds. It can be used for dyeing cotton, linen, silk, wool, viscose, nylon and vinylon.
    Most of these dyes are insoluble in water and organic solvents, but can be dissolved in alkali sulfide solution, after dissolution can be directly dyed fiber. However, it is not suitable for dyeing protein fiber because of its strong alkalinity. These dyes are homogeneous, low in price and good in color fastness, but the color is not bright.
    Disperse dyes have low solubility in water, fine particles and disperse in dyeing solution. They belong to non-ionic dyes. They are mainly used for dyeing polyester fibers with high fastness.

Acid dyes are water-soluble and contain water-soluble genes such as sulfonic group and carboxyl group. It can directly dye protein fibers in acidic, weak acid or neutral media, but the moisture treatment fastness is poor.
    Coatings are suitable for all fibers. Dark fabrics will harden by mechanical adhesion of resins to fibers, but the color matching is accurate. Most of them have good light fastness and wash fastness, especially for medium and light colors.