SULFATION OF POLYETHYLENE TEREPHTHALATE FIBERS AND ITS DYEING WITH DISPERSE DYES

Abstract

In the previous study it was pointed out that poly (ethylene terephthalate) (PET) fiber treated with high concentrated sulfuric acid had good dyeing properties not only for a cationic dye but also for disperse dye.
This study was attempted to clarify the relation between treating conditions of PET fibers with sulfuric acid and tensile strength or amount of disperse dyes adsorbed in the fibers.
Sulfation of PET fibers was carried out with wider treating conditions than that of on the previous study, i. e. the sulfation was carried out with sulfuric acid of 70_??_77% at 90_??_100°C for 1_??_180 min. The reason for the high affinity of sulfated PET fibers to disperse dyes was also discussed.
The fiber prepared with suitable condition has good dyeing properties and good fastness against light and washing. The tensile strength of fiber thus prepared is just as high as that of untreated fibers.