Cationic Brown dyes
Cationic dyes is a kind of textile dyes, also known as alkaline dyestuff and base. They are soluble in water and ionized in aqueous solution to produce positively charged colored ions. The cations of the dye can be combined with the acid group of the third monomer in the fabric to make the fiber dyeing.
The product is the special dye of acrylonitrile fiber. The dyeing method is in the bathtub with weak acidity (pH value is about 4.5), with acetic acid and sodium acetate as buffer, in the presence of dielectric and appropriate additives, close to boiling dyeing. The dyeing mechanism can be divided into three steps:
(1) The cation in the dyeing bath is adsorbed on the surface of the fiber.
(2) The cation diffuses from the fiber surface to the interior.
(3) The cation is salt-bonded with the anion group contained in the fiber.
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