Low carboxylic end group PET has better thermooxidative stability than regular PET polymer.

PET is a kind of semi-crystalline polymer obtained by the reaction of PTA and EG. Since PET Polymer came on the scene, it soon became the most abundant variety of synthetic fibers because of its excellent properties. During production, storage, and application, the polyester material performance gradually declines due to the combined effects of internal and external factors. So it is essential to conduct research on the aging process of polyester.

The content of the COOH is a quality index of polyester materials. And the international requirement of COOH in PET is less than 30 mol/t. The value directly affects the thermal stability of the polyester chips. At the same time, the acid is an esterification catalyst. That is to say, the carboxylic end group can catalyze the depolymerization of the PET molecular chain. High carboxylic end group PET will accelerate the aging and degradation under the catalysis of end groups during processing, storage, and usage. As a result, their performance will drop sharply. Therefore, low carboxylic end group PET is becoming more and more popular in the market.

Till now, Hubei Decon has researched two types of low carboxylic end group PET Polymer. One is a film-grade PET chip, which is widely used in solar module back sheets. Our product helps PV to extend its service life. For more information, please click https://www.polyestermfg.com/film-grade-pet-chip/. Another is a textile-grade polyester chip, which is applied in spinning monofilament yarn. The polymer is also called hydrolysis resistance PET. The specification of the chip is followed.

No. Items Unit Test Results
1 IV dl/g 0.72
2 DEG Content % 1.404
3 COOH Content mol/t 6.0
4 Melting Point 257
5 Color Value L 48.74
b 2.77
a -1.25