Abstract: By dyeing acrylic yarn with cationic dyes, this paper studied the effects of eight dyes with different concentrations on the K/S value of acrylic yarn, and tested the color fastness, dye saturation value, and fluorescent property of dyed yarn samples. The results show that the saturation value of acrylic yarn dyed with cationic dyes is 5% or so, and the color fastness to soaping and rubbing of the dyed yarn is grade 4 to 5, which can meet the needs of daily wear.

Key words: acrylic fiber; cationic dyes; K/S value