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A method for preparing aliphatic polycarbonate by precipitation polymerization

A technology of precipitation polymerization and polycarbonate, which is applied in the field of polymer preparation, can solve the problems of complex separation process and achieve the effect of simple separation process, low energy consumption, high molecular weight and monomer conversion rate

Active Publication Date: 2015-12-02
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method avoids the recovery loss and product thermal degradation caused by direct devolatilization, but the recovery of aliphatic polycarbonate products and the separation process of aliphatic polycarbonate products and unreacted epoxy compound monomers are more complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] 3.6 g of glycerol and 2.3 g of yttrium trichloroacetate were dissolved in 100 mL of propylene oxide to form a first mixed solution, and 8 mL of diethylzinc was dissolved in 200 mL of n-hexane to form a second mixed solution. The first mixed solution was slowly added to the second mixed solution under the conditions of vigorous stirring and ice-water bath to form a uniform emulsion catalyst solution.

Embodiment 2

[0054] 0.9 g of glycerol and 0.6 g of yttrium trichloroacetate were dissolved in 100 mL of propylene oxide to form a first mixed solution, and 2 mL of diethylzinc was dissolved in 200 mL of n-hexane to form a second mixed solution. The first mixed solution was slowly added to the second mixed solution under the conditions of vigorous stirring and ice-water bath to form a uniform emulsion catalyst solution.

Embodiment 3

[0056] Dissolve 1.8g glycerol and 1.1g yttrium trichloroacetate in 200mL of propylene oxide to form a first mixed solution, disperse 7.6g of zinc glutarate in the first mixed solution, and stir evenly; 4mL of diethyl zinc is dissolved A second mixture was formed in 200 mL of n-hexane. The second mixed solution was slowly added to the first mixed solution under vigorous stirring and an ice-water bath to form a uniform emulsion catalyst solution.

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PUM

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Abstract

The invention provides a method for preparing aliphatic polycarbonate by adopting a precipitation polymerization method. The method comprises the following steps of: reacting an epoxy compound, a catalyst and carbon dioxide with one another in a diluting agent to obtain a reaction solution, wherein the diluting agent is one or more of an ether compound, C4-C12 saturated straight-chain alkane and C5-C8 cycloalkane; and cooling and filtering the reaction solution to obtain a filtrate and a solid substance, and drying the solid substance to obtain aliphatic polycarbonate. According to the method, a process for separating aliphatic polycarbonate from unreacted epoxy compound is simple, aliphatic polycarbonate is powdery, and the filtered and recovered diluting agent and the unreacted epoxy compound can be recycled.

Description

technical field [0001] The invention belongs to the technical field of polymer preparation, and in particular relates to a method for preparing aliphatic polycarbonate by a precipitation polymerization method. Background technique [0002] The excessive emission of carbon dioxide caused by human activities makes the greenhouse effect more and more serious, which has a destructive impact on the global climate and ecological environment. The efficient use of carbon dioxide is of great significance for alleviating the imbalance of the carbon cycle. Aliphatic polycarbonate synthesized from carbon dioxide has good oxygen barrier properties, good processability, and excellent full biodegradability. It can be widely used in people's daily life, especially in food preservation and packaging. field. Therefore, it is of great social and economic significance to research and develop new methods and new processes for producing aliphatic polycarbonate with carbon dioxide as raw materia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G64/34C08G64/02
Inventor 闵加栋王献红张亚明张文彬
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI