A compound catalyst and its application in the preparation of bio-based polycarbonate

Abstract

The invention provides a composite catalyst and its application in the preparation of bio-based polycarbonate, the composite catalyst includes halide and organic salt catalyst, the halide includes alkali metal halide, metal halide and alkaline earth Any one or a combination of at least two of the metal halides. The organic salt catalyst includes any one or a combination of at least two of organic alkali metal catalysts or organic alkaline earth metal catalysts. In the composite catalyst, the halide and organic salt catalysts play a catalytic role in synergy with each other, and have a more Good catalytic activity and high stability of the catalyst can improve the catalytic selectivity of the catalyzed reaction and increase the product yield. The composite catalyst is used in the preparation of bio-based polycarbonate, which improves the activity and selectivity of the catalyst. The time is shortened, the product yield is increased, and higher molecular weight bio-based polycarbonate can be prepared.

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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