Cationic dyeing properties of trilobal high dimethyl 5-sulfoisophthalate sodium salt (SIP) content cationic dyeable polyester (THCDP) fabrics

Abstract

To make the polyester ionically dyeable, trilobal high dimethyl 5-sulfoisophthalate sodium salt (SIP) content cationic dyeable polyester (THCDP) was developed in this study which aimed to investigate its structural and dyeing properties. Its lower glass transition temperature and crystallinity degree contributed to lower dyeing temperature. A low-cost and environmentally friendly dyeing solution was applied in this study and the dyeing temperature of newly THCDP fabric could be reduced to 90°C, distinctly different from the previous cationic dyeable polyester which needed more than 100°C to reach dyeing standard. Meanwhile, THCDP showed its higher dyeing saturation value than normal acrylic fabric and cationic dyeable polyester with the Cationic Red X-GRL dyestuff. In present, both pure THCDP and blend textiles were developed. A series of THCDP/Cotton blends’ (20/80, 35/65, 65/35, 80/20) dyeing behaviors were tested, and found they could be dyed at 90°C with good color fastness and levelness.

Keywords:

• cationic dye
• trilobal high dimethyl 5-sulfoisophthalate sodium salt (SIP) content cationic dyeable polyester (THCDP)
• low temperature
• dyeing saturation value
• THCDP/Cotton blends