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Device and process for dynamically and continuously preparing polycarbonate

A polycarbonate, dynamic technology, applied in the field of dynamic continuous preparation of polycarbonate, can solve the problem of unstable molecular weight and molecular weight distribution of batch products, low mass transfer and heat transfer efficiency of polycarbonate, and difficult operation of polymerization process, etc. problems, to achieve precise and controllable molecular weight and molecular weight distribution, low production costs, and stable product quality.

Active Publication Date: 2022-06-24
XIAN MODERN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above process generally adopts a kettle-type batch process. The mass transfer and heat transfer efficiency of polycarbonate produced by this process is not high. The "one pot" batch operation makes the polymerization process difficult to operate. High proportion of gas consumption, low production process efficiency and poor intrinsic safety

Method used

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  • Device and process for dynamically and continuously preparing polycarbonate
  • Device and process for dynamically and continuously preparing polycarbonate
  • Device and process for dynamically and continuously preparing polycarbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] This embodiment provides a process for the dynamic continuous preparation of polycarbonate, which is realized by the above-mentioned device for dynamic continuous preparation of polycarbonate. In this embodiment, bisphenol A: phosgene: end-capping agent and acid binding agent The molar ratio of bisphenol A is 1:1.19:0.08:2.39 (the ratio of sodium hydroxide includes the amount used for the preparation of bisphenol A sodium salt), which specifically includes the following steps:

[0052] Step 1: The 30°C bisphenol A sodium salt aqueous solution, the -10°C phosgene solution and the 25°C acid binding agent sodium hydroxide aqueous solution were injected into the dynamic continuous flow reactor from feed ports A, B and C through a metering pump, respectively, Carry out a polymerization reaction, including three reaction processes of photochemistry, prepolymerization and polycondensation; reaction temperature: 41 ° C; bisphenol A sodium salt aqueous solution flow rate at 96g / m...

Embodiment 2

[0055] This embodiment provides a process for the dynamic continuous preparation of polycarbonate, which is realized by the above-mentioned device for dynamic continuous preparation of polycarbonate. In this embodiment, bisphenol A: phosgene: end-capping agent and acid binding agent The molar ratio of bisphenol A is 1:1.19:0.115:2.39 (the ratio of sodium hydroxide includes the amount used for the preparation of bisphenol A sodium salt), which specifically includes the following steps:

[0056] Step 1: The 25°C bisphenol A sodium salt aqueous solution, the -10°C phosgene solution and the 25°C acid binding agent sodium hydroxide aqueous solution are respectively injected into the dynamic continuous flow reactor from feed ports A, B and C through a metering pump, Carry out a polymerization reaction, including three reaction processes of photochemistry, prepolymerization and polycondensation; reaction temperature: 41.5 ° C; bisphenol A sodium salt aqueous solution flow rate at 960g...

Embodiment 3

[0059] This embodiment provides a process for the dynamic continuous preparation of polycarbonate, which is realized by the above-mentioned device for dynamic continuous preparation of polycarbonate. In this embodiment, bisphenol A: phosgene: end-capping agent and acid binding agent The molar ratio of bisphenol A is 1:1.19:0.3286:2.39 (the ratio of sodium hydroxide includes the amount used for the preparation of bisphenol A sodium salt), which specifically includes the following steps:

[0060] Step 1: The 25°C bisphenol A sodium salt aqueous solution, the -10°C phosgene solution and the 25°C acid binding agent sodium hydroxide aqueous solution are respectively injected into the dynamic continuous flow reactor from feed ports A, B and C through a metering pump, Carry out a polymerization reaction, including three reaction processes of photochemistry, prepolymerization and polycondensation; reaction temperature: 41°C; bisphenol A sodium salt aqueous solution flow rate is 192g / mi...

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Abstract

The invention discloses a device and a process for dynamically and continuously preparing polycarbonate, which have the advantages of accurate and controllable polymerization process, molecular weight and molecular weight distribution, continuous operation, low production unit consumption and high efficiency, and greatly improve the intrinsic safety and product quality of the production process.

Description

technical field [0001] The invention belongs to the technical field of polymer preparation technology, and in particular relates to a device and technology for dynamic continuous preparation of polycarbonate. Background technique [0002] Polycarbonate (PC for short) is a colorless and transparent amorphous thermoplastic material. Because of its unique properties, including high impact strength, high heat resistance, flame retardancy and transparency, it is widely used in various fields. It has become one of the most widely used high-performance resins. It can be used in electronic appliances, auto parts, medical equipment, construction, textiles, packaging, aerospace and defense industries. It is the fastest growing engineering plastics in recent years. Polycarbonate can be divided into aliphatic, cycloaliphatic and aromatic, etc., but restricted by factors such as processing performance and production cost, bisphenol A aromatic polycarbonate is currently the largest and mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J19/20C08G64/24
CPCB01J19/0006B01J19/20C08G64/24Y02P20/10
Inventor 张晓光毛明珍苗贤何爱晓张选利马文礼杨翠凤景青梁睿渊张震马瑞进王伯周
Owner XIAN MODERN CHEM RES INST
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