Reactive dye is a dye containing reactive groups that can react with fibers to form covalent bonds. Common reactive groups are dichloromethanetriazine, vinylsulfone and monochloromethane There are three kinds of hydrazine, and their reaction capabilities are different, so the process conditions used are different, and low temperature, medium temperature and high temperature are used for dyeing.
During the dyeing of reactive dyes, the dye is absorbed into the fiber and the dye diffuses into the fiber to reach the dyeing equilibrium. After the alkali is added, the dye starts to react with the fiber to fix it, and reaches an equilibrium again. Soap boiling after dyeing to remove dyes or hydrolyzed dyes that are not fixed to the fiber, and improve the vividness of color