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Method for catalytically preparing polycarbonate

A polycarbonate, catalytic preparation technology, applied in the field of catalytic preparation of polycarbonate, can solve the problems of restricting the application of polycarbonate, product metal residue pollution and other problems, achieve the suppression of side reactions of methylation, improve the poor universality, Good catalytic selectivity

Active Publication Date: 2020-05-29
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these catalysts can improve the activity of 1,4:3,6-dihexanol and promote the synthesis of high molecular weight polycarbonate to a certain extent, there are metal residues in the synthesized products to pollute the environment, and this also limits the Applications of polycarbonate in baby products, medical equipment and food packaging

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] In this example, isosorbide and dimethyl carbonate were used as raw materials to prepare a polycarbonate under the composite catalysis of cellulose and 1,5,7-triazabicyclo[4.4.0]dec-5-ene. ester, the reaction formula is as follows:

[0055]

[0056] The preparation method comprises the following steps:

[0057] (1) Transesterification stage: Add 14.6g (0.1mol) isosorbide and 63g (0.7mol) dimethyl carbonate in the reaction flask, 1,5,7-triazabicyclo[4.4 .0]dec-5-ene has a mass of 1.46×10 -2 g, the mass of cellulose is 1.46×10 -3 g, under a nitrogen atmosphere, react at 98°C under normal pressure for 6h, then slowly increase the temperature to 180°C, and react for 1h to volatilize unreacted dimethyl carbonate and low-boiling product methanol to obtain a prepolymer;

[0058] (2) Polycondensation stage: the temperature in step (1) is raised from 180°C to 240°C, the vacuum is slowly reduced to 50Pa, and the reaction is carried out for 4 hours to obtain the product isos...

Embodiment 2

[0062] The difference between this example and Example 1 is that the mass of 1,5,7-triazabicyclo[4.4.0]dec-5-ene in the composite catalyst is replaced by 4-dimethylaminopyridine, and other The conditions are exactly the same as in Example 1.

[0063] Molecular weight test: The GPC test result of the product shows that the number average molecular weight of polycarbonate M n 17000g / mol, weight average molecular weight M w It is 30000g / mol.

[0064] Thermal performance test: The DSC test results of the product show that the glass transition temperature T of polycarbonate g It is 148°C.

Embodiment 3

[0066] The difference between this example and Example 1 is that the mass of 1,5,7-triazabicyclo[4.4.0]dec-5-ene in the composite catalyst is replaced by 4-pyrrolidinopyridine, and other The conditions are exactly the same as in Example 1.

[0067] Molecular weight test: The GPC test result of the product shows that the number average molecular weight of polycarbonate M n 16000g / mol, weight average molecular weight M w It is 28000g / mol.

[0068] Thermal performance test: The DSC test results of the product show that the glass transition temperature T of polycarbonate g is 150°C.

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Abstract

The invention relates to a method for catalytically preparing polycarbonate, wherein the method comprises the steps: by using carbonic acid diester and a dihydroxy compound as raw materials, carryingout transesterification under the catalytic action of a nitrogen-containing organic compound or a compound of the nitrogen-containing organic compound and cellulose, and carrying out polycondensationto generate polycarbonate. The method adopts the catalyst, the catalyst has the advantages of high catalytic activity, good selectivity and no influence on the quality of polycarbonate, and polycarbonate prepared by the method has the advantages of large molecular weight and high glass-transition temperature. The method provided by the invention has the advantages of wide raw material selection range, small catalyst dosage and mild reaction conditions, the reaction process does not cause environmental pollution, and the product does not contain toxic substances, so that the method is an efficient, green and environment-friendly low-cost polycarbonate preparation process.

Description

technical field [0001] The invention belongs to the technical field of polymer preparation, and relates to a method for catalytically preparing polycarbonate. Background technique [0002] Polycarbonate (PC) is a high-performance engineering plastic with good transparency, excellent thermal stability and outstanding mechanical properties. It is widely used in optics, automobiles, construction, electronics, aerospace and other fields. In recent years, the application and development of polycarbonate has developed in the direction of high compounding, high function, specialization, and serialization, and the requirements for the safety and environmental protection of materials are getting higher and higher. However, the traditional polycarbonate preparation method is synthesized from petrochemical products bisphenol A and highly toxic phosgene. This route not only seriously pollutes the environment, but also the estrogen effect of bisphenol A will cause some health problems. I...

Claims

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Application Information

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IPC IPC(8): C08G64/30
CPCC08G64/305
Inventor 徐菲方文娟张锁江张振才孙玮李晨浩安宏哲杨子锋
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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