It is mainly salts of organic bases. The cationic part of the dye structure is responsible for color production. Basic dyes are also called cationic dyes.

Properties:

1.  Cationic dyes
2.  Soluble in alcohol and methylated spirit but not in water
3.  Exhibit excellent shades
4.  Applicable to jute and acrylic
5.  Show average to good fastness

 

Mechanism:

The dyeing of acrylic fiber with these dyes is carried out in a weakly acidic condition where acidic acid and sodium acetate are used with a wetting agent, dispersing agent, and sequestering agent. The temperature and pH should be strictly maintained to prevent unlevel dyeing.

The initial uptake of dyes is very high, so a retarding agent is necessary.

Generally, dyeing is carried out at 98°c, and slow cooling is necessary to prevent the formation of creases. Finally, after-treatment with a non-ionic detergent, acetic acid, and a softening agent is carried out.

 

Application:  Jute and acrylic.