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Catalyst for aliphatic polycarbonate polymerization, preparation method and use method thereof

A technology of polycarbonate and catalyst, which is applied in the field of catalyst to achieve the effects of simple preparation, stable structure and simple operation

Inactive Publication Date: 2007-10-24
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, we have not yet seen the literature report on the synthesis of aliphatic polycarbonate by using zinc 2,2'-biphenyl dicarboxylate as a catalyst to catalyze the reaction of carbon dioxide and epoxy compounds

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Catalyst 2,2`-zinc diphenylcarboxylate [Zn(C 14 h 8 o 4 )·H 2 O] preparation.

[0020] Weigh 0.48g (2mmol) of biphenyl dicarboxylic acid into a 100mL Erlenmeyer flask equipped with a magnetic stirrer, add 20mL of methanol, and stir to dissolve. Under stirring at room temperature, slowly add a solution of 0.44g (2mmol) zinc acetate dissolved in 20mL of methanol, and a large amount of white precipitates will appear. Continue to stir and react for 0.5h, let it stand, and filter with suction. The precipitate was washed several times with methanol, transferred to a watch glass, and placed in a vacuum drying oven at 100° C. for 24 hours in vacuum to obtain 0.54 g of a white powdery solid product with a yield of 89%. IR(KBr): 1605(v as COO - ), 1402 (v s COO - ), 753(Zn-O)cm -1 .

Embodiment 2

[0022] Catalyst 2,2`-zinc diphenylcarboxylate [Zn(C 14 h 8 o 4 )·H 2 O] preparation.

[0023] Weigh 0.48g (2mmol) biphenyl dicarboxylic acid into a 100mL Erlenmeyer flask equipped with a magnetic stirrer, add 20mL 95% ethanol, and stir to dissolve. A solution of 0.55 g (2 mmol) of zinc acetate dissolved in 20 mL of 95% ethanol was slowly added under stirring at 60°C. After the addition is complete, continue to stir and react for 2.5 hours, then cool, let stand, and filter with suction. The precipitate was washed several times with ethanol, transferred to a watch glass, and placed in a vacuum drying oven at 100° C. for 24 hours in vacuum to obtain 0.52 g of a white powdery solid product with a yield of 86%. IR(KBr): 1605(v as COO - ), 1402 (v s COO - ), 753(Zn-O)cm -1 .

Embodiment 3

[0025] Copolymerization of carbon dioxide and cyclohexane oxide (solvent-free).

[0026] Put 0.10g of the catalyst 2,2`-zinc biphenyldicarboxylate and a stirrer into a 100mL stainless steel autoclave that has been vacuum-dried at 100°C in advance, heat up to 100°C and vacuum-dry for 12h, cool to room temperature, and fill with carbon dioxide to normal pressure . Add 10 mL (9.6 g) of epoxycyclohexane into the reaction kettle with a glass syringe, fill with carbon dioxide, keep the pressure at 2.5 MPa, stir with magnetic force, react at 80 ° C for 30 h, cool to room temperature, and stop the reaction.

[0027] The reaction solution was taken out, the unreacted epoxycyclohexane was distilled, the residue was dissolved in dichloromethane, filtered, the filtrate was washed with dilute acid, dilute alkali and distilled water successively, dried, and part of dichloromethane was recovered. Slowly drop the concentrated solution after evaporating dichloromethane into a sufficient amoun...

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Abstract

The invention discloses a making method of [Zn (C14H8O4) .H2O] as catalyst of aliphatic polycarbonate under indoor temperature, which is characterized by the following: copolymerizing carbon dioxide and epoxy cyclohexane at 60-100 deg. c under 2. 0-4. 5Mpa or reacting 2, 2'-diphenyl diformic acid and zinc acetate to produce the catalyst with molecular weight at 120, 000-160, 000 and Tg between 112 and 115; making the alternate copolymerizing rate more than 95% and catalyzing rate to 653 polymer / g zinc.

Description

technical field [0001] The invention relates to a catalyst for preparing aliphatic polycarbonate by copolymerization of carbon dioxide and epoxycyclohexane and its application method. Background technique [0002] In recent years, controlling the emission of carbon dioxide and effectively using cheap and low-toxic carbon dioxide to serve human beings has become one of the strategic research topics in many countries. However, due to the high thermodynamic stability of carbon dioxide, its application is limited. Copolymerization of carbon dioxide and epoxy compounds to synthesize aliphatic polycarbonate is not only simple, but also has low cost of raw materials and wide sources, which opens up a new way for the preparation of high molecular compounds from carbon dioxide, has wide application prospects, and is the best choice for fixing carbon dioxide. An effective way with low pollution and environmental friendliness. [0003] The aliphatic polycarbonate prepared by the copo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G64/34C08G64/02
Inventor 曹少魁卜站伟秦刚
Owner ZHENGZHOU UNIV
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