Method for preparing polycarbonate

A polycarbonate and polymer technology, applied in the field of preparation of new polycarbonate materials, can solve the problems of not being widely used in the chemical industry, poor dimensional thermal stability at high temperature, and low glass transition temperature, and achieve biodegradability and Improved thermal stability, improved performance such as biocompatibility, and easy operation

Inactive Publication Date: 2014-09-10
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the copolymers obtained from the copolymerization of carbon dioxide and propylene oxide are mostly amorphous and have a low glass transition temperature, which makes their thermal stability at high temperature very poor; while the copolymers obtained from the copolymerization of carbon dioxide and epoxycyclohexane Although the copolymer also has an amorphous structure, although the glass transition temperature has been greatly improved, the brittleness of the polymer is relatively large, which is not conducive to molding and processing, so it cannot be widely used in the chemical industry

Method used

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  • Method for preparing polycarbonate
  • Method for preparing polycarbonate
  • Method for preparing polycarbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. The main catalyst is the tetradentate Schiff base metal complex SalenCr Ⅲ Preparation of Cl

[0037] (1) Resolution of cyclohexanediamine

[0038]Add 20g of L-(+)-tartaric acid and 60mL of distilled water into a 250mL three-necked flask equipped with a stirring bar, reflux condenser and constant pressure dropping funnel, stir until dissolved at room temperature, and the solution temperature is 60°C, then add dropwise 40mL of trans-1,2-cyclohexanediamine mixture, control the reaction temperature at 60°C, after the dropwise addition, raise the reaction temperature to a constant value and start to add glacial acetic acid dropwise, with the addition of glacial acetic acid, a white precipitate is formed, Cool to room temperature after keeping for 20min, then stir for 1h, and then cool for 1h after the end, then carry out suction filtration and washing (washing with water and ethanol three times in sequence), and dry overnight in a vacuum oven at 40°C to obtain the produc...

Embodiment 2

[0053] 1. The main catalyst is the tetradentate Schiff base metal complex SalenCr Ⅲ Preparation of Cl

[0054] (1) Resolution of cyclohexanediamine

[0055] Add 25g of L-(+)-tartaric acid and 70mL of distilled water into a 250mL three-neck flask equipped with a stirring bar, reflux condenser and constant pressure dropping funnel, stir at room temperature until dissolved, and the solution temperature is 65°C, then add dropwise 50mL of trans-1,2-cyclohexanediamine mixture, control the reaction temperature at 70°C, after the dropwise addition, raise the reaction temperature to a constant value and start adding glacial acetic acid dropwise, with the addition of glacial acetic acid, a white precipitate is formed, After keeping for 20min, cool to room temperature, stir for 2h, and cool for 2h after finishing, then carry out suction filtration and washing (washing with water and ethanol three times in sequence), and dry overnight in a vacuum oven at 50°C to obtain the product ( R, ...

Embodiment 3

[0070] 1. The main catalyst is the tetradentate Schiff base metal complex SalenCr Ⅲ Preparation of Cl

[0071] (1) Resolution of cyclohexanediamine

[0072]Add 25g of L-(+)-tartaric acid and 70mL of distilled water into a 250mL three-neck flask equipped with a stirring bar, reflux condenser and constant pressure dropping funnel, stir at room temperature until dissolved, and the solution temperature is 65°C, then add dropwise 50mL of trans-1,2-cyclohexanediamine mixture, control the reaction temperature at 70°C, after the dropwise addition, raise the reaction temperature to a constant value and start adding glacial acetic acid dropwise, with the addition of glacial acetic acid, a white precipitate is formed, After keeping for 20min, cool to room temperature, stir for 2h, and cool for 2h after finishing, then carry out suction filtration and washing (washing with water and ethanol three times in sequence), and dry overnight in a vacuum oven at 50°C to obtain the product ( R, R...

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Abstract

The invention discloses a method for preparing polycarbonate through three-component copolymerization of carbon dioxide, epoxy cyclohexane and alpha-epoxy pinane, and belongs to the macromolecular material field. A catalyst system is formed by a quadridentate Schiff base metal complex SalenCr<III> Cl as a main catalyst and bis(triphenylphosphine)iminium chloride or 3-butylammonium chloride or 1-methyl imidazole or 4-dimethylamino pyridine and the like as a catalyst promoter, and under a condition of the carbon dioxide pressure of 2.0-5.5 MPa, the polycarbonate material is prepared by copolymerization of epoxy cyclohexane, alpha-epoxy pinane and carbon dioxide. The method makes full use of abundant forest resources in China, and is simple in process and convenient to operate; and the obtained polymer not only has good biodegradation and biocompatibility, but also has the advantages of good thermal stability, large molecular weight, narrow molecular weight distribution and the like, and can be widely used in biology, medicines, agriculture and other industries.

Description

technical field [0001] The invention relates to the preparation of a novel polycarbonate material, in particular to a method for preparing polycarbonate by ternary copolymerization of carbon dioxide, epoxycyclohexane and α-epoxy pinane. Background technique [0002] Controlling the emission of carbon dioxide and effectively using it has become a strategic research topic for various countries. The synthesis of polycarbonate with biodegradability using carbon dioxide as raw material has become the focus of the current carbon dioxide research field. Under the action of metal catalysts, carbon dioxide and epoxy compounds are alternately copolymerized to prepare biodegradable polycarbonate, which is a green polymerization process for the potential large-scale application of carbon dioxide. [0003] At present, the most reported research is the binary copolymerization of carbon dioxide and propylene oxide and carbon dioxide and cyclohexane oxide. However, the copolymers obtained...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G64/34
Inventor 贾庆明山小芬王进陕绍云蒋丽红王亚明
Owner KUNMING UNIV OF SCI & TECH
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