Process for preparing polyester resins and fibers comprising regenerated bis (2-hydroxyethyl) terephthalate
Patent Information
- Application Number
- CN202380037788.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2022-05-09
- Filing Date
- 2023-05-03
- Publication Date
- 2024-12-13
AI Technical Summary
The depolymerization reaction products of existing polyester resins contain a large amount of oligomers, resulting in the formation of side reaction products of diethylene glycol esters, affecting polymerization performance and product quality, and being difficult to control purity, limiting its use in packaging materials and fiber applications. Use of
Through multi-stage depolymerization reaction, combined with high performance liquid chromatography (HPLC) determination and compression polycondensation reaction, the content of diethylene glycol esters is controlled to be less than 2%, significantly reducing the formation of side reaction products, and preparing high-purity terephthalene diphenyl diphenyl Bis(2-hydroxyethyl) formate was carried out and polycondensation reaction was carried out under low vacuum to prepare polyester resin.
Recovery of high-purity bis(2-hydroxyethyl) terephthalate is achieved, and polyester resins and fibers with excellent heat resistance and quality are prepared, improving their performance in packaging and fiber applications.
Smart Images
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