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A Detailed Introduction Of Cationic Dyes

Aug 16, 2017

      Cationic dyes are a kind of textile dyes, also known as alkaline dyes and salt-based dyes. Dissolved in water in a cationic state, cationic dyes soluble in water, in aqueous solution ionization, the formation of positively charged colored ions dye. The dye's cation can be combined with the third monomer of the fabric to make the fiber dyeing, which is a special dye for acrylic fiber dyeing, which has the advantages of high strength, bright color, good fastness to light.Cationic Dyes
      Cationic dyes are developed with the development of petrochemical industry, our country in the early 60 also successively developed and produced the first generation of various cationic dyes. The world produces dyes in developed countries, the production of cationic dyes and alkaline dyes in total production of only 10% of the total amount of dye. In the last century 90, China's cationic dye production has more than 2000 tons/year, only accounted for more than 1% of total dye, but also part of the export. cationic dyes with the X-type three primary colors and cationic pink FG and red 5GN for the production of large varieties. In recent years, the research and development of good dyeing performance, specificity, new structure varieties, as well as old product process improvement, energy saving, wastes governance and other fields.Cationic Dyes
      Cationic dyes can be classified according to application performance and chemical structure type. According to the applicability of China, the existing dyes are classified into ordinary, X and M types. According to the chemical structure, the composition of the cationic charge in the dye molecule is different from that of the dye-hair-color group.Cationic Dyes
      Cationic Dye is a special dye for acrylonitrile fiber, the staining method is in the weak acid (ph value of about 4.5) in the bathtub, acetic acid and sodium acetate as a buffer, in the presence of dielectric and appropriate additives, near boiling dyeing. The dyeing mechanism can be divided into three steps: (1) The dye cation in the dye bath is adsorbed on the fiber surface. (2) dye cation is diffused from the surface of the fiber to the inside. (3) The dye cation and the fiber contain anion group into salt bonding. Under normal dyeing conditions, the last step of salt-forming is irreversible, which can result in high fastness and unevenness of staining. The two-step reaction is fast, the second step spreads slowly, it determines the whole dyeing speed. Because of the affinity between dye and fiber, in order to achieve uniform dyeing effect, it is necessary to strictly control the temperature of the bath, ph value, electrolyte, slow dyeing agent.Cationic Dyes