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Preparation method of aromatic polycarbonate

A polycarbonate and aromatic technology, used in the field of preparing aromatic polycarbonate, can solve the problems of difficult separation and removal of by-products and organic solvents, safety and environmental pollution, and difficulty in large-scale production.

Active Publication Date: 2013-03-20
SHAANXI YANCHANG PETROLEUM GRP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of adopting interfacial polycondensation method to prepare polycarbonate are: 1 must use phosgene as reactant, there are obvious safety and environmental pollution problems; 2 because by-products such as hydrogen chloride and sodium chloride can be produced in the reaction , and because of the existence of a large amount of organic solvent dichloromethane, expensive preventive measures must be adopted, and high requirements are also placed on the reaction equipment; It is difficult to be separated and removed, which adversely affects product quality; 4. Polycarbonate prepared by interfacial polycondensation often has inconsistent color, high particulate content and high chlorine content
However, when using this method for industrialization, the equipment is complicated and expensive, and the follow-up processing is complicated, making it difficult to produce on a large scale.

Method used

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  • Preparation method of aromatic polycarbonate
  • Preparation method of aromatic polycarbonate
  • Preparation method of aromatic polycarbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0109] Embodiment 1: Preparation of aromatic polycarbonate

[0110] Use as attached figure 1 , attached figure 2 , attached image 3 with attached Figure 4 The polymerization apparatus shown produces aromatic polycarbonate products.

[0111] In this example, the polymerization reaction apparatus used is as attached figure 1 shown. The polymerization reaction device includes two alternately used raw material melting and mixing tanks 1 and 1', a melting raw material delivery pump 2, a primary prepolymerization preheater 3, a primary stirred tank type prepolymerization reactor 4, a primary volatile By-product condenser 5, primary prepolymerization vacuum pump 6, primary prepolymerization gear pump 7, secondary prepolymerization preheater 3', secondary stirred tank prepolymerization reactor 4', secondary volatile byproduct condensation 5', two-stage pre-polymerization vacuum pump 6', two-stage pre-polymerization gear pump 7', one-stage deep polymerization static mixer 8, o...

Embodiment 2

[0140] Embodiment 2: Preparation of aromatic polycarbonate

[0141] Diphenyl carbonate and bisphenol A are used as raw materials, the molar ratio of the two is 1.12, potassium hydroxide is used as a catalyst, and the dosage is 0.000008% based on the total weight of the raw material mixture.

[0142] The reaction conditions are as follows: the reaction conditions of the primary prepolymerization reactor are temperature 210°C and absolute pressure 9KPa; the reaction conditions of the secondary prepolymerization reactor are temperature 250°C and absolute pressure 3KPa;

[0143] The operating conditions of the first-stage deep polymerization static mixer are temperature 250°C and the nitrogen intake 0.3NL / kg; the operating conditions of the first-stage deep polymerization heat exchanger are temperature 255°C; the operating conditions of the first-stage multi-stage diversion falling film polycondensation reactor are The temperature is 255°C and the absolute pressure is 0.5Kpa.

[...

Embodiment 3

[0148] Embodiment 3: Preparation of aromatic polycarbonate

[0149] Diphenyl carbonate and bisphenol A are used as raw materials, the molar ratio of the two is 1.12, potassium hydroxide is used as a catalyst, and the dosage is 0.000008% based on the total weight of the raw material mixture.

[0150] The reaction conditions are as follows: the reaction conditions of the primary prepolymerization reactor are temperature 220°C and absolute pressure 9KPa; the reaction conditions of the secondary prepolymerization reactor are temperature 260°C and absolute pressure 3KPa; the operating conditions of the primary deep polymerization static mixer are temperature 260 ℃ and nitrogen feed 0.3NL / kg; the operating condition of the first-stage deep polymerization heat exchanger is a temperature of 265°C; the operating condition of the first-stage multi-stage diversion falling film polycondensation reactor is a temperature of 265°C and an absolute pressure of 0.5Kpa.

[0151] The operating co...

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Abstract

The invention relates to aromatic polycarbonate and a preparation method of the aromatic polycarbonate. The method comprises the steps of diaryl carbonate and aromatic dihydroxy compound raw material deoxygenation treatment, raw material and catalyst melt mixing, prepolymerization, prepolymer and carrying agent gas-liquid mixing, mixture heat exchange, polymerization reaction in a multi-section flow guide falling film type polycondensation reactors and the like. The aromatic polycarbonate produced by adopting the method provided by the invention has the advantages that the molecular weight isstable, the distribution is narrow, and the product chromaticity is good. The method solves the environment pollution problem, the serious equipment corrosion problem and the problem of performance influence caused by the separation and purification difficulty of polycarbonate products in the existing interface polycondensation method. Therefore, the method provided by the invention is very suitable for the industrial large-scale production of high-quality polycarbonate.

Description

【Technical field】 [0001] The invention belongs to the technical field of polymer materials. More specifically, the present invention relates to a method for preparing aromatic polycarbonates by melt transesterification. 【Background technique】 [0002] Polycarbonate is an amorphous, odorless, non-toxic, highly transparent colorless or slightly yellow thermoplastic engineering plastic, because of its excellent impact resistance, high tensile strength, bending strength, and compressive strength; small creep and stable dimensions And other excellent properties are widely used in glass assembly industry, automobile industry and electronics, electrical industry, followed by industrial machinery parts, CDs, civil clothing, computers and other office equipment, medical and health care, film, leisure and protective equipment, etc. in a field. Among the many methods for preparing polycarbonate, the method that has been widely used in industrial production is to generate an interface...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G64/30C08G64/04
Inventor 张积耀袁定雄王志海王思晨张勇房根祥高俊文王坤辛昭
Owner SHAANXI YANCHANG PETROLEUM GRP
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