Compound catalyst, and application thereof in preparation of bio-based polycarbonate

Abstract

The invention provides a compound catalyst, and an application thereof in the preparation of bio-based polycarbonate. The compound catalyst comprises a halide and an organic salt catalyst, and the halide comprises any one or a combination of at least two of alkali metal halide, metal halide and alkali earth metal halide. The organic salt catalyst comprises any one or a combination of at least twoof an organic alkali metal catalyst and an organic alkali earth metal catalyst, and the halide and the organic salt catalyst in the compound catalyst cooperate with each other to play a catalytic role, so the catalyst has the advantages of good catalytic activity, high stability, increase of the catalytic selectivity of a catalytic reaction, and increase of the product yield; and the compound catalyst improves the activity and selectivity of the catalyst, shortens the reaction time, increases the product yield and obtains the bio-based polycarbonate with a higher molecular weight when used for preparing bio-based polycarbonate.

Description

technical field [0001] The invention belongs to the technical field of green and clean catalysis, and in particular relates to a composite catalyst and its application in preparing bio-based polycarbonate. Background technique [0002] Polycarbonate (PC) is a colorless, transparent, amorphous, thermoplastic material with properties such as heat resistance, impact resistance and chemical corrosion resistance, and is widely used in various fields. With people's attention to green chemistry and sustainable development, the development of bio-based polymer materials has become a new trend. The PC production process is also gradually developing towards a green and environmentally friendly direction, and gradually gets rid of the existing traditional phosgene method and the melt transesterification route of diphenyl carbonate / bisphenol A. Therefore, the preparation of isosorbide using renewable resources PC has become the focus of recent research. [0003] Isosorbide is derived ...

AI Technical Summary

Problems solved by technology

Although there are many types of catalysts reported, the specific research is not in-depth. The existing developed catalysts have problems such as low catalytic activity, low selectivity, poor catalyst stability, and high cost. Finally, the reaction of trace amounts of isosorbide in the prepolymerization stage is insufficient. , leading to yellowing of the product in the polycondensation stage, so it is particularly important for industrialization to develop a kind of catalytic system with high activity, high selectivity and stable structure

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