Composite catalyst for preparing aromatic polycarbonate and application of composite catalyst

A composite catalyst and polycarbonate technology, which is applied in the field of composite catalysts for the preparation of aromatic polycarbonates, can solve problems such as branching, local overheating, difficult to control, rearrangement, etc., to reduce production costs, reduce equipment requirements, and process stability Effect

Active Publication Date: 2017-08-22
濮阳市宏源石油化工有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The trend of polycarbonate industrial production method is to adopt the non-phosgene melt transesterification process, even if the aromatic dihydroxy compound and the carbonic acid diester are directly subjected to the melt transesterification reaction under the action of a catalyst, and finally the aromatic polycarbonate is prepared; However, the biggest defect of this method is that it has relatively strict requirements on the purity of raw materials, production equipment, and process technology.
In addition, in the process of preparing polycarbonate by melt transesterification, in order

Method used

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  • Composite catalyst for preparing aromatic polycarbonate and application of composite catalyst
  • Composite catalyst for preparing aromatic polycarbonate and application of composite catalyst
  • Composite catalyst for preparing aromatic polycarbonate and application of composite catalyst

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preparation example Construction

[0030] In addition, for the composite catalyst of the present invention, the present invention specially designs a preparation method, which includes the following steps: uniformly mixing the organic base compound and the basic ionic liquid to obtain the composite catalyst.

[0031] In addition, the composite catalyst provided by the invention is applied in the preparation process of aromatic polycarbonate, including the following steps:

[0032] Polycarbonate was synthesized by non-phosgene method using dihydroxy compound and carbonic diester as raw materials. Among them, the molar ratio of dihydroxy compound to diester carbonate is 1: (1.015~1.1), and the molar ratio of composite catalyst to dihydroxy compound is (0.005~0.05):1; the synthesis process of polycarbonate includes transesterification process and Polycondensation process: The specific process of transesterification is: the reaction temperature is 130-190 °C, the pressure is reduced, the reaction time is 2-5 hours,...

Embodiment 1

[0036] The invention provides a kind of composite catalyst, and raw material component comprises tert-butyllithium and alkaline ionic liquid, wherein, R 1 is isopropyl, R 2 is dimethylamino, X - for CH3COO - .

[0037] Adopt the composite catalyst in the present embodiment to prepare aromatic polycarbonate, comprise the following steps:

[0038] S101: mix 1mol tert-butyllithium with 3mol alkaline ionic liquid (R 1 is isopropyl, R 2 is dimethylamino, X - for CH 3 COO - ) are mixed and dispersed in an organic solvent to obtain a composite catalyst.

[0039] S102: Mix diphenyl carbonate and bisphenol A at a molar ratio of 1.015:1, and then heat to a molten state;

[0040] S103: Add the composite catalyst to the product obtained in S102 at 0.5 wt% relative to the mass of bisphenol A to carry out transesterification reaction, and react for 2 hours at a temperature of 150°C and a pressure of 3000Pa to obtain a prepolymer; then raise the temperature to 170 ℃, the pressure dro...

Embodiment 2

[0046] The invention provides a kind of composite catalyst, and raw material component comprises tert-butyllithium and alkaline ionic liquid, wherein, R 1 is ethyl, R 2 is amino, X - for CH3COO - .

[0047] Adopt the composite catalyst in the present embodiment to prepare aromatic polycarbonate, comprise the following steps:

[0048] S101: mix 1mol tert-butyllithium with 5mol alkaline ionic liquid (R1 is ethyl, R2 is amino, X - for CH 3 COO - ) are mixed and dispersed in an organic solvent to obtain a composite catalyst.

[0049] S102: mixing diphenyl carbonate and bisphenol A in a molar ratio of 1.05:1, and then heating to a molten state;

[0050] S103: Add the composite catalyst to the product obtained in S102 at 5 wt% relative to the mass of bisphenol A to carry out transesterification reaction, and react for 2 hours at a temperature of 150°C and a pressure of 3000Pa to obtain a prepolymer; then raise the temperature to 190°C , the pressure dropped to 1500Pa, reacte...

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Abstract

The invention relates to a composite catalyst for preparing aromatic polycarbonate and application of the composite catalyst. The composite catalyst contains the following raw material components: an organic alkali catalyst and an alkali ionic liquid. The composite catalyst is used in the preparation process of the aromatic polycarbonate, namely, by taking a dihydroxyl compound and dialkyl carbonate as raw materials, synthesizing polycarbonate by using a non-phosgene ester interchange method, wherein the mole ratio of the dihydroxyl compound to the dialkyl carbonate is 1:(1.015-1.1); and the amount of the composite catalyst accounts for 0.5-5% of the mass of the dihydroxyl compound. By adopting the composite catalyst provided by the invention, not only is ester exchange reaction in the polycarbonate synthesis process implemented at a relatively high speed at relatively low temperature, but also the residual amount of the catalyst in a polymerization product is reduced to the minimum extent; and in addition, special properties of a polymeric product are achieved, and meanwhile, adverse influence of application properties of the product, namely the polycarbonate, is avoided to the maximum extent.

Description

technical field [0001] The invention relates to the technical field of polycarbonate synthesis, in particular to a composite catalyst for preparing aromatic polycarbonate and its application. Background technique [0002] As a biodegradable eco-friendly polymer, polycarbonate is characterized by high strength, high toughness, high heat resistance, shock resistance, good processing performance, excellent transparency, dimensional stability, non-toxicity, weather resistance, Known for its electrical insulation, radiation sterilization resistance and mechanical properties, it is a thermoplastic engineering plastic with excellent comprehensive properties. [0003] The trend of polycarbonate industrial production method is to adopt the non-phosgene melt transesterification process, even if the aromatic dihydroxy compound and the carbonic acid diester are directly subjected to the melt transesterification reaction under the action of a catalyst, and finally the aromatic polycarbon...

Claims

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Application Information

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IPC IPC(8): C08G64/30C08G64/06
CPCC08G64/06C08G64/307
Inventor 史吉华吴俊涛武胜强
Owner 濮阳市宏源石油化工有限公司
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