Method for preparing polycarbonate catalyzed by ionic liquid

A polycarbonate, catalytic preparation technology, applied in clean catalysis, green field, can solve residual problems

Active Publication Date: 2019-01-29
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, by adjusting the thermal stability of the catalyst, the problem of catalyst residue in the product is solved, so that the catalyst can not only ensure the catalytic activity from transesterification to the later stage of polycondensation, but also be able to thermally decompose in the final stage of the reaction without affecting the polymer. quality

Method used

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  • Method for preparing polycarbonate catalyzed by ionic liquid
  • Method for preparing polycarbonate catalyzed by ionic liquid
  • Method for preparing polycarbonate catalyzed by ionic liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0028]

[0029] Implementation method: in the transesterification stage, under normal pressure, 6.85g (0.030mol) of bisphenol A and 6.75g (0.032mol) of diphenyl carbonate were heated to 150°C under a nitrogen atmosphere to melt them, and 3.18×10 -3 g (5×10 of the amount of bisphenol A substance -2 %) of acetic acidated 1,8-diazabicyclo(5,4,0)undec-7-ene, and reacted under nitrogen atmosphere for 11min to synthesize the prepolymer; -5 MPa, at a reaction temperature of 260° C., react for 20 minutes 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 97%, and molecular weight is 3.3 * 10 4 .

Embodiment 2

[0031] Same as Example 1, the catalyst used is benzoated 1,8-diazabicyclo(5,4,0) undec-7-ene 4.11×10 - 3 g (5×10 of the amount of bisphenol A substance -2 %), its structural formula is Other conditions remain unchanged, the yield of the obtained polycarbonate is 98%, and the molecular weight is 2.4×10 4 .

Embodiment 3

[0033] Same as Example 1, the catalyst used is lactated 1,8-diazabicyclo(5,4,0) undec-7-ene (3.63×10 - 3 g, 5 x 10 of the amount of bisphenol A substance -2 %), its structural formula is Other conditions remain unchanged, the yield of the obtained polycarbonate is 96%, and the molecular weight is 2.7×10 4 .

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Abstract

The invention relates to a method for preparing polycarbonate catalyzed by ionic liquid. The method is characterized in that heterocyclic nitrogen-containing ionic liquid is used as a catalyst, the amount of the catalyst is 5*10<-3>-5% of the mass of a dihydroxy compound, the dihydroxy compound and bis(trichloromethyl) carbonate are taken as raw materials, a feeding mol ratio of the dihydroxy compound to the bis(trichloromethyl) carbonate is 1:0.8-1:10, and the corresponding polycarbonate is obtained by melt polymerization. A synthesis process of the polycarbonate includes two stages of transesterification and polycondensation. In the transesterification stage, a prepolymer is obtained under conditions of a reaction temperature of 90-180 DEG C, an atmospheric pressure and reaction time of0.05-6 h. In the polycondensation stage, the polycarbonate is obtained by synthesizing prepolymer at 200-270 DEG C, a vacuum degree of 4.0*10<-3> MPa-1.0*10<-5> MPa, and reaction time of 0.05-7 h. Thesynthetic method has the advantages of simple catalyst components and molecular structure that can be designed. Moreover, the catalyst is strong in alkalinity and high in activity. By-products can berecycled, which reduces the cost. The synthetic method does not use highly toxic phosgene, dose not require a solvent, is very little in three wastes generation, and conforms to the concept of cleanproduction.

Description

Technical field: [0001] The invention relates to the technical field of green and clean catalysis, and specifically refers to a method for preparing polycarbonate through melt polymerization by using heterocyclic nitrogen-containing basic ionic liquid as a catalyst, dihydroxy compound and carbonic acid diester as raw materials. Background technique: [0002] As one of the five major thermoplastic engineering plastics, polycarbonate has excellent transparency, weather resistance, insulation, non-toxicity and dimensional stability, and has been widely used in electronic appliances, construction, automobile manufacturing, aerospace, optics and other fields. At present, only bisphenol A aromatic polycarbonate has achieved large-scale industrial production, and its main production methods include phosgene method and melt polymerization method. The phosgene method uses toxic phosgene, which will produce a large amount of organic wastewater and solid waste; although the melt polyme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G64/30
CPCC08G64/305C08G64/307
Inventor 张锁江徐菲成卫国刘晓敏张延强孙玮张振才
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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