Ternary catalyst for preparing aliphatic polycarbonate with high molecular weight

Abstract

The ternary catalyst consists of metal salt, alkyl zinc and glycerine. Glycerine and RE salt in certain ratio are added into selected organic solvent, and under the protection of CO2 and while maintaining the reactant mixture at 25 deg.C, alkyl zinc in calculated amount is dropped. After finishing dropping alkyl zinc, the reactant product is aged in CO2 atmosphere to obtain white ternary catalyst suspension, which is used directly in the copolymerization of CO2 and epoxide to produce aliphatic polycarbonate with number-average molecular weight as high as 50,000 and CO2 fixing rate over 40 wt%.

Description

technical field

[0001] The invention belongs to a preparation method of a three-way catalyst for preparing high molecular weight aliphatic polycarbonate. Background technique

[0002] Due to the burning of fossil fuels in the production process of thermal power generation, steelmaking, oil refining, cement, etc., a large amount of carbon dioxide is emitted, and the resulting greenhouse effect has constituted increasingly serious environmental pollution. Therefore, carbon dioxide is considered an "environmental hazard". gas. But on the other hand, carbon dioxide is a resource that can be used under certain conditions. One of the main directions of using carbon dioxide is to synthesize polymer materials from it. Carbon dioxide copolymers (aliphatic polycarbonates) with highly alternating structures can be synthesized from carbon dioxide and epoxy compounds. Due to the presence of ester bonds in the main chain, the polymer is not only photodegradable, but also a fully biodeg...