Method for preparing polycarbonate by fusing ester exchange method and catalyst used for the same

A technology of melt transesterification and polycarbonate, which is applied in the field of catalyst and melt transesterification to prepare polycarbonate, and achieves the effect of good hue

Inactive Publication Date: 2008-02-20
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] These catalysts have some effect in the preparation of polycarbonate, but they do not

Method used

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  • Method for preparing polycarbonate by fusing ester exchange method and catalyst used for the same
  • Method for preparing polycarbonate by fusing ester exchange method and catalyst used for the same
  • Method for preparing polycarbonate by fusing ester exchange method and catalyst used for the same

Examples

Experimental program
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Effect test

Embodiment 1

[0063] The reaction was carried out in a stirred nickel metal reaction vessel equipped with a non-leakage magnetic coupling drive. The vacuum system is connected to the reactor through the phenol collection bottle and the phenol distillation condenser. The pressure of the reaction system is jointly controlled by the vacuum pump and the nitrogen cylinder introduced into the downstream of the phenol collection bottle. U-type mercury pressure is used for high pressure (atmospheric pressure to 50 mbar). Gauge measurement, low pressure (50 mbar to 1.333 mbar and below) with a Maxwell rotary vacuum gauge. The temperature of the reaction system is heated and controlled by circulating heat transfer oil. A discharge port is provided at the bottom of the reactor.

[0064] Add 600.0 g (2.628 mol) of solid bisphenol A (Japan GE Plastics Co., Ltd.), 602.4 g (2.812 mol) of solid diphenyl carbonate (Shanghai Shenju Chemical Factory) and 602.4 g (2.812 mol) of solid diphenyl carbonate / bisphe...

Embodiment 2

[0081] Except that for 1 mol of bisphenol A, use 1.0×10 -8 mol La(acac) 3 Except for the polymerization catalyst, the same procedure as in Example 1 was performed to prepare polycarbonate.

Embodiment 3

[0083] Except that for 1 mol of bisphenol A, use 1.0×10 -6 mol La(acac) 3 Except for the polymerization catalyst, the same procedure as in Example 1 was performed to prepare polycarbonate.

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PUM

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Abstract

The invention relates to a method of preparing polycarbonate with a fusing ester exchange method and catalyst used thereof, pertaining to the polycarbonate preparation technical field. The composite catalyst of the invention comprises acetylacetone metallic composition and alkaline compound containing nitrogen; the polycarbonate is prepared by fusing ester exchange between aromatic dicarboxylic compound and di-phosphate ester and the catalyst used is composite catalyst; the invention uses one mol dihydroxy compound, 10-8-10-4 mol acetylacetone metallic composite and 10-5-10-2 alkaline compound containing nitrogen under the temperature of 100 DEG C - 320 DEG C. The exchange reaction is gradually and fragmentally depressurized with unceasingly evaporating monohydric phenol from 133 millibar to 1 millibar below. The invention can produce the relatively small branching and cross linking polycarbonate with good color shade, and is good for preservation and postprocessing of the polycarbonate products.

Description

technical field [0001] The invention belongs to the technical field of polycarbonate preparation, and further relates to a method for preparing polycarbonate by melt transesterification and a catalyst used therefor. Background technique [0002] Polycarbonate is known for its excellent transparency, impact resistance, heat resistance, dimensional stability, non-toxicity, weather resistance, electrical insulation, radiation sterilization resistance and mechanical properties. It is a thermoplastic with excellent comprehensive properties. engineering plastics. [0003] The traditional preparation process of aromatic polycarbonate by phosgene method is to mix the aqueous solution of sodium salt of aromatic dihydroxy compound with dichloromethane dissolved in phosgene, and obtain polycarbonate through interfacial polycondensation. The advantage of this method is that the production equipment and The condition requirements are simple, and the reaction can be carried out at normal...

Claims

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Application Information

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IPC IPC(8): C08G64/20
Inventor 魏东炜李复生崔金华田红兵
Owner TIANJIN UNIV
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