Study On The Preparation And Performance Of Acid-dyestuff Dyeable Polyester

To explore rational polymerization process, polymerization modifier of different types and components has been demonstrated in this thesis. Using a combination of several modifier synthesized with BHET, the acid dyeable modified polyester was prepared, which was tested on dyeability. The mentioned modifiers are: polyethylene glycol (PEG-2000), SIPE, adipic acid, HKSL resin and isophthalic acid (IPA). In addition, based on the modified polyester with the higher dyeing rate, the best synthesis of technology and its performance were studied and tested.It has been indicated in the result that: The dyeability of acid dyeable polyester could be improved significantly by the combination of SIPE, PEG-2000 and HKSL resin modifier. When PEG-2000 content was added to 24%, the dyeing rate of acid dyes was 25.2%. It has been showed in the infrared spectra that the structure of PET molecules could be changed and a seat to acid dyes could be provided by the copolymerization of SIPE, PEG-2000, HKSL resin to PET macromolecular chains.The obtained modified polyester by combining IPA with PEG-2000 had the better hue and lower dyeing rate. When the IPA and PEG-2000 content were 19%and 24%, respectively, the dyeing rate was 24.5%. With the increasing of IPA content, the Tg of the modified polyester decreased.When adipic acid ester, SIPE and PEG-2000 were selected as modifier, we got the polyester with higher dyeing rate. Besides, when the modifier were added, 16%,20%,and 24%, respectively, the dyeing rate of acid dyes was 40.46%. Because the modifier is easily oxidized at high temperature, it is necessary to strictly control temperature. Uniform and slow heating should be satisfied, especially in esterification stage. In addition, PET hue could be improved by adding antioxidants and atalyst after heat distribution.