Basic dyes are the first synthetic dyes in the world. Basic dyes are organic alkali salts usually chloride where the dyestuff is basic or positive radical. Basic dyes are called cationic dyes because the chromophore in basic dye molecules contains a positive charge. Basic dye is a powerful coloring agent. Light fastness of basic dyes are poor but wet fastness is good.
Use of Basic Dyes:
Basic dyes are widely used for dyeing of acrylic fibres. It's also used for dyeing of jute, cut flowers, dried flowers, coir etc. Basic dyes also used in paper mills and mosquito coil factory.
Dyeing Process of Jute:
First make paste with basic dye and acetic acid with the addition of water.
Set the dye bath at 40°C and add dye solution to the dye bath.
Then put the sample in the dye bath and increase the temperature to 80-100°C.
Then perform the dyeing for an hour with this temperature.
After dyeing the dyed sample is squeezed after washing and then drying.
Dyeing Curve for Jute Dyeing:
Dyeing Process of Acrylic Fibre:
First prepare the dye bath for dyeing. Set dye bath without solution and set pH 5 - 5.5 and then put acrylic fibre in the dyebath. After 10 min put dye solution in the dye bath. Then gradually increase temperature and after 15 min raise it to 80°C and continue dyeing. Then run it for 45 min at 90-100°C and then drain, cold wash and dry.