一种制备PENT共聚酯的方法
By transesterification and melt polycondensation of bis(2-hydroxyethyl) terephthalate and dimethyl terephthalate, the problem of utilizing waste polyester resources was solved, and a high-performance PENT copolyester was prepared, which is suitable for the packaging material field.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- KOZA NOVEL MATERIALS CO LTD
- Filing Date
- 2022-08-31
- Publication Date
- 2026-07-17
AI Technical Summary
Existing technologies are difficult to efficiently utilize waste polyester resources to prepare PENT copolyesters with high PEN content, and there are problems such as limited improvement in glass transition temperature, high color value and low reaction conversion rate.
PENT copolyester is prepared by transesterification of bis(2-hydroxyethyl) terephthalate (BHET) with dimethyl terephthalate to generate di(2-hydroxyethyl) terephthalate. Then, it is subjected to melt polycondensation reaction with excess BHET monomer. The reaction conditions are controlled by catalysts such as zinc acetate and zinc oxide and phosphoric acid compounds to prepare the copolyester.
A high conversion rate and high proportion of dimethyl naphthalate were achieved, and the prepared PENT copolyester has a high glass transition temperature, low diethylene glycol content and excellent gas barrier properties, making it suitable for the packaging materials field.
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