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Double function catalyst for synthesizing polycarbonate

A bifunctional catalyst and polycarbonate technology, applied in the field of catalysts, can solve the problems of long reaction time, high pressure, low catalyst activity, etc., and achieve the effects of high polymer product selectivity, mild reaction conditions and high catalyst activity.

Active Publication Date: 2007-08-22
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent application numbers CN89100701.6 and CN91109459.8 disclose a bimetallic catalyst system supported by polymers with anion coordination, and can also obtain 10 4 Catalytic efficiency in grams of polymer per mole of catalyst, but the support is difficult to separate from the resulting polycarbonate
[0004] Most of the above-mentioned methods for preparing polycarbonate have low catalyst activity, long reaction time, and high pressure, which requires an organic solvent; accompanied by the production of cyclic carbonate by-products or low carbonate units in the polymerization product; the catalyst and reaction in the reaction system The molar ratio of the substrate is high; the separation of the product and the catalyst is difficult, etc.

Method used

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  • Double function catalyst for synthesizing polycarbonate
  • Double function catalyst for synthesizing polycarbonate
  • Double function catalyst for synthesizing polycarbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In a stainless steel autoclave with an effective volume of 200ml, add in the following order at ambient temperature: 0.1 mmol of tetradentate Schiff base cobalt complex (X, Y are 2,4-dinitrophenol oxyanions; R 1 = R 2 = H; R 3 is tert-butyl; R 4 , R 5 is methyl; R 6 n is 2; Z is nitrogen; the quaternary ammonium salt group is at the 5th position of the benzene ring) and 1 mole of propylene oxide, and then carbon dioxide gas is introduced to maintain a constant pressure of 2.0 MPa. Control the temperature at 50°C, react under magnetic stirring for 6 hours, slowly release unreacted carbon dioxide in the autoclave, collect unreacted propylene oxide in a cold trap at -20°C, and then add a certain amount of methanol / chloroform mixture The polymer was dissolved, and then a large amount of ether was added to precipitate polycarbonate. It was filtered, washed several times with ether, and dried in vacuo to constant weight to obtain 37 g of polypropylene carbonate as a whit...

Embodiment 2

[0028] In the same equipment used in Example 1, under the same conditions, only the diamine skeleton in the tetradentate Schiff base cobalt complex was changed from ethylenediamine (i.e. R 1 = R 2 =H) is replaced by cyclohexanediamine (i.e. R 1 , R 2 for -(CH 2 ) 4 -)). After reacting at 50° C. for 6 hours, 39 g of polypropylene carbonate was obtained with a molecular weight of 62,000 and a molecular weight distribution of 1.33, and the carbonate units in the polymer exceeded 99%.

Embodiment 3

[0030] In the same equipment used in Example 1, under the same conditions, only the diamine skeleton in the tetradentate Schiff base cobalt complex was changed from ethylenediamine (i.e. R 1 = R 2=H) is replaced by o-phenylenediamine (i.e. R 1 , R 2 for-(CH) 4 -)). After reacting at 50° C. for 6 hours, 38 g of polypropylene carbonate was obtained, the molecular weight was 59400, the molecular weight distribution was 1.29, and the carbonate units in the polymer exceeded 99%.

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Abstract

The present invention relates to one kind of high activity catalyst for catalyzing and activating CO2 to react with alkane epoxide to synthesize polycarbonate. The high activity catalyst is tetradentate Schiff base metal complex with double function, i. e., it has both electrophlic center originated from the metal ion in the complex and nucleophilic center originated from the quaternary ammonium salt or quaternary phosphonium salt connected to the benzene ring in the complex. The catalyst can catalyze the reaction of CO2 and alkane epoxide effectively to prepare polycarbonate.

Description

technical field [0001] The invention relates to a catalyst for synthesizing polycarbonate, in particular to a highly active single-component bifunctional catalyst for synthesizing polycarbonate by catalytically activating carbon dioxide and alkylene oxide. Background technique [0002] Carbon dioxide is the main gas that causes the greenhouse effect, and it is also one of the most abundant carbon sources on earth. The chemical fixation of carbon dioxide is an important research field of green chemistry. Among them, a main direction of utilizing carbon dioxide is to prepare polycarbonate by copolymerizing it with alkylene oxide under the action of a catalyst. The high polymer can be photodegraded and biodegraded; meanwhile, it has excellent performance of blocking oxygen and water. Therefore, polycarbonate can be used as engineering plastics, biodegradable non-polluting materials, disposable medical and food packaging materials, adhesives, and composite materials. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G64/00
Inventor 吕小兵任伟民张英菊王辉
Owner DALIAN UNIV OF TECH
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