Method for preparing polycarbonate through basic ionic liquid catalysis

A basic ion, polycarbonate technology, used in clean catalysis and green fields, can solve the problems of poor catalyst stability, low selectivity and low reactivity

Active Publication Date: 2016-09-21
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

Although there are many types of catalysts reported, there are still problems such as low reactivity, low selectivity, and poor catalyst...

Method used

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  • Method for preparing polycarbonate through basic ionic liquid catalysis
  • Method for preparing polycarbonate through basic ionic liquid catalysis
  • Method for preparing polycarbonate through basic ionic liquid catalysis

Examples

Experimental program
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Embodiment 1

[0031]

[0032] Implementation method: the transesterification stage is under normal pressure conditions, 4.38g (0.030mol) isosorbide and 6.43g (0.030mol) diphenyl carbonate are heated to 98 ℃ under nitrogen atmosphere to make it melt, add 2.96×10 -3 g (5×10 of the amount of isosorbide substance -2 %) tetraethylammonium imidazolium salt, react 5h synthetic prepolymer under nitrogen atmosphere; Polycondensation stage is that above-mentioned prepolymer is in vacuum degree 1.0 * 10 -5 MPa, at a reaction temperature of 230°C, react for 5 hours to obtain polycarbonate. After the reaction, it was cooled to room temperature under vacuum, dissolved in chloroform and precipitated in anhydrous methanol. The yield of gained polycarbonate is 93.08%, and molecular weight is 2.4 * 10 4 .

Embodiment 2

[0034] With embodiment 1, catalyst used is tetraethylammonium dicyandiamide salt 2.89 * 10 -3 g (5×10 of the amount of isosorbide substance -2 %), its structural formula is Other conditions remain unchanged, the yield of the obtained polycarbonate is 74.7%, and the molecular weight is 1.8×10 4 .

Embodiment 3

[0036] Same as Example 1, the catalyst used is tetraethylammonium-1,2,4-triazole salt 2.97×10 -3 g (5×10 of the amount of isosorbide substance -2 %), its structural formula is Other conditions remain unchanged, the yield of the obtained polycarbonate is 92.3%, and the molecular weight is 1.9×10 4 .

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Abstract

The invention relates to a method for preparing polycarbonate through basic ionic liquid catalysis. The method is characterized in that quaternary ammonium and quaternary phosphonium basic ionic liquid serves as a catalyst, the dosage of the catalyst is 5*10<-3>%-5% that of a dihydroxy compound, the dihydroxy compound and dialkyl carbonate serve as the raw materials, the feeding molar ratio of the dihydroxy compound to dialkyl carbonate is 1:0.8 to 1:10, and polycarbonate is synthesized through melting ester exchange. The synthetic processes of polycarbonate comprise the two stages of ester exchange and polycondensation, wherein for the ester exchange stage, on the condition that the reaction temperature ranges from 98 DEG C to 150 DEG C, the pressure is atmospheric pressure, and the reaction time ranges from 3 h to 6 h, prepolymer is obtained, and for the polycondensation stage, polycarbonate is obtained by synthesizing the prepolymer on the condition that the temperature ranges from 210 DEG C to 260 DEG C, the vacuum degree ranges from 4.0*10<-3> MPa to 1.0*10<-5> MPa, and the reaction time ranges from 1 h to 7 h. The synthetic method has the following advantages that the catalyst is simple in component and high in activity, a by-product phenol can be recycled, and the cost is reduced; toxic phosgene is cleared off, and the method is environmentally friendly; zero emission is almost achieved, and the method completely conforms to the concept of cleaning production.

Description

Technical field: [0001] The invention relates to the technical field of green and clean catalysis, and specifically refers to a method for synthesizing polycarbonate by melting transesterification under the catalysis of quaternary ammonium and quaternary phosphorus basic ionic liquids by using dihydroxy compounds and carbonic acid diesters as raw materials. Background technique: [0002] Polycarbonate is a thermoplastic engineering plastic with excellent comprehensive properties. It is the only product with good light transmission among the top five engineering plastics in the world. It is widely used in electronic / electrical products, construction and automobile manufacturing and other fields. Polycarbonate is usually produced from raw materials derived from petroleum resources. In recent years, due to concerns about the depletion of petroleum resources and the global environment, research on the preparation of polycarbonate by using biomass resources such as plants instead ...

Claims

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Application Information

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IPC IPC(8): C08G64/30C08G64/04
CPCC08G64/04C08G64/305
Inventor 张锁江徐菲成卫国孙剑张延强孙玮
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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