Abstract:

A new easy disperse dyeable polyester (NEDDP) which can be dyed under atmospheric pressure has been synthesized by PTA, EG, IPA, PEG. Tg of NEDDP is below than 60℃, Tcc is about 120℃ and Tm is about 252℃. NEDDP as island component and easy hydrolysis degradation polyester（EHDPET）as sea component, Sea-Island composite fibers can be obtained. Further NEDDP super fine fibers formed hydrolysis with sparse alkali solution. And during hydrolysis course island component wasn’t damaged i. Fabric made of NEDDP super fine fibers (0.06dtex ) can be dyed to Medium depth at 100℃ and deep black at 120℃. Several NEDDP’s POY, DTY and FDY (1.0~1.5dex) produced, and these fabrics can be dyed black colour at 100℃and have same fastness with common PET fabrics dyed at 130℃, the energy cest can be saved by 30% if NEDDP fabrics dyed the same color. When dying close to deep color, the energy cost can be saved by 20% and dyeing time can be shorten by 25%.

Key words: easy desperse dyeable polyeser, sea-island compound fiber, energy conservation, glass transition temperature