Cationic modification and dyeing process of rayon/cotton mixture

Rayon/cotton interweave fabric is modified with cationic modifier CR2000 to improve the dye uptake.The cationic modification process and the reactive dyeing process are discussed.The optimum cationic modification process is determined as follows: reacting at 80 ℃ for 60 min with CR2000 20 g/L,NaOH 8 g/L and bath ratio 1∶10.The optimum dyeing process with reactive red RGB is dyeing at 80 ℃ for 60 min with pH value 7 and bath ratio 1∶10.The reactive dyeings feature high color yield,good color fastness,high dye utilization and reduced COD value of dyeing effluent.