Cationic dye is a kind of alkaline dye and is successfully developed on the fundamental of the alkaline dyes. It dyes the fiber through the binding of its cation ion to the acidic group in the third monomer with of the acrylon, thus leading to high fastness.
Dyeing retarding agent is often added to improve the dyeing properties. Cationic dye is the dedicated dye for dying acrylic fiber. It can also be used to modify the dyeing and printing of polyester and nylon. It is mainly used for dyeing polyacrylonitrile fibers.