Coloration of Cationized Cellulosic Fibers-A Review

Dyeing of cellulosic materials with reactive and direct dyes is commercially very popular, but is not eco-friendly. On the other hand, pigment colors cannot be applied by conventional exhaust methods. These problems can be solved or minimized by increasing the affinity of cellulosic materials. Cationization of cellulosic fibers improves affinity towards anionic dyes like reactive dyes, direct dyes, and pigment colors dispersed with anionic dispersants. This review paper discusses various studies relating to cationization of cotton, linen, and ramie fibers using various chemicals (e.g., quaternary ammonium compounds, chitosan, CHPTAC, other epoxy compounds, and triazine) as well as non-reactive pretreatments with cationic polymers.