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Method for preparing polycarbonate based on high-efficiency catalysis by ionic liquid

A technology of ionic liquid and polycarbonate, which is applied in the field of polycarbonate prepared by melt transesterification reaction, can solve the problems of low activity, low molecular weight of polycarbonate, metal residue, etc.

Active Publication Date: 2018-01-12
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these catalysts have problems such as metal residues, low activity, and low molecular weight of polycarbonate synthesized, so it is very important to develop catalysts with high activity and the ability to synthesize high molecular weight polycarbonate

Method used

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  • Method for preparing polycarbonate based on high-efficiency catalysis by ionic liquid
  • Method for preparing polycarbonate based on high-efficiency catalysis by ionic liquid
  • Method for preparing polycarbonate based on high-efficiency catalysis by ionic liquid

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Embodiment 1

[0028]

[0029] Under a nitrogen atmosphere, add 4.38g (0.03mol) isosorbide, 6.42g (0.03mol) diphenyl carbonate to a 250ml glass flask, melt at 100°C, add 3.42×10 -3 g (5×10 of the amount of isosorbide substance -2 %) 1-butyl-3-methylimidazole lactate ([Bmim][CH 3 CHOHCOO]), its structural formula is The transesterification reaction was carried out under normal pressure for 5h to synthesize the prepolymer. Then the reaction temperature was slowly raised to 240° C., the vacuum degree was slowly raised to 0.1 MPa, and the polycondensation reaction was carried out for 0.5 h to finally obtain the polycarbonate shown in formula I. The yield was 99%, the number average molecular weight was 61700 g / mol, and the glass transition temperature was 174°C.

Embodiment 2

[0031] With embodiment 1, catalyst used is 6.28 * 10 -3 g (5×10 of the amount of isosorbide substance -2 %) 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt ([Bmim][NTf 2 ]), whose structural formula is The polycondensation reaction time is 3h, and other conditions remain unchanged. The yield was 96%, the number average molecular weight was 12000 g / mol, and the glass transition temperature was 152°C.

Embodiment 3

[0033] With embodiment 1, catalyst used is 2.34 * 10 -3 g (5×10 of the amount of isosorbide substance -2 %) Hydroxide 1-butyl-3-methylimidazole ([Bmim][OH]), its structural formula is Other conditions remain unchanged. The yield was 98%, the number average molecular weight was 46000 g / mol, and the glass transition temperature was 172°C.

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Abstract

The invention discloses a method by using imidazole type ionic liquid to catalyze an ester exchange of carbonic ester and dihydroxyl compound melting so as to synthesize polycarbonate at high efficiency. The method comprises the following steps of under an inert gas atmosphere, mixing the carbonic ester and the dihydroxyl compound, adding a catalyst, and performing the ester exchange and condensation, so as to obtain the product. The molecular weight of the obtained polymer is 1.0*10<4> to 2.0*10<5>g / mol, and the glass transition temperature is 50 to 200 DEG C. Compared with the ester exchangecatalysts such as the traditional alkaline metal salt, alkaline metal salt or quaternary ammonium and quaternary phosphor salt,, the polycarbonate with higher molecular weight can be catalyzed and synthesized by the imidazole type ionic liquid.

Description

Technical field: [0001] The invention relates to the technical field of green and high-efficiency catalysis, and specifically refers to a method for preparing polycarbonate through melting transesterification reaction under the catalysis of imidazole ionic liquid, using carbonate and dihydroxy compound as raw materials. Background technique: [0002] Polycarbonate (PC) is a high-performance engineering plastic with light weight, good light transmission, high strength, ductility and toughness, so it is widely used in electronic appliances, building materials, automobile manufacturing, aviation Aerospace and medical equipment and other fields. In recent years, bio-based polymer materials have attracted much attention, and 1,4:3,6-dihexanol is the bio-based raw material with the most development potential for the synthesis of polycarbonate. The two adjacent furan rings in its structure make the molecular structure have high rigidity and high thermal stability. Therefore, 1,4:...

Claims

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Application Information

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IPC IPC(8): C08G64/30
Inventor 成卫国马聪凯徐菲董丽张锁江
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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