Preparation method of epoxy propane-carbon dioxide copolymer

Abstract

The invention discloses an epoxy propane carbon dioxide copolymer preparation method, characteristic includes the following steps: (1) sequentially adding epoxy propane and a multi-element catalyst to a polymerization reaction kettle, then introducing high purity carbon dioxide into the reaction kettle, controlling the pressure at 3.0-3.5 MPag and the temperature at 70-80 DEG C, reacting for 3-5 h until the viscosity reaches 7*105 CP, controlling the temperature at 65-70 DEG C, reacting for 4-5 h until the viscosity reaches 7*106 CP, cooling the material to 45-55 DEG C to obtain a crude copolymer product; and (2) starting a blender of a condensed washing kettle, reducing the pressure in the polymerization reaction kettle to 0.5 MPag, sending the crude product and a condensation detergent to the copolymerization washing kettle for even mixing, and conducting liquid-solid separation on the condensed washing mixed liquid to obtain the product. The invention has the advantages of high polymerization efficiency, a small amount of reaction by-products and low catalyst consumption.

Description

technical field [0001] The invention relates to a preparation method of a propylene oxide-carbon dioxide copolymer. Background technique [0002] Carbon dioxide, one of the main raw materials for the synthesis of carbon dioxide-propylene oxide copolymer, is the CO produced in many industrial production fields. 2 Exhaust gas, discharged into the atmosphere not only causes environmental pollution, but also wastes carbon resources. When carbon dioxide is activated to a high degree under the action of a catalyst, it can undergo a copolymerization reaction with epoxide to form a carbon dioxide-epoxide copolymer. After post-treatment, a carbon dioxide degradable material can be obtained. CO can be converted by the synthesis of carbon dioxide-propylene oxide copolymer 2 Resource immobilization, which not only opens up new carbon resources, alleviates the shortage of petrochemical raw materials, but also reduces the ecological environment damage caused by carbon dioxide emissions....

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Problems solved by technology

[0005] However, up to the present stage, the reported literatures have pointed out that the reaction process is complicated, the process is difficult to control, the heat released during the polymerization process is large, and the heat is difficult to remove in time, which makes it difficult to realize large-scale production of polymerization.

At the same time, the separation of the polymerized monomer propylene oxide from the polymer after polymerization is also a huge problem for industrial production.

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