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Preparation method of polycarbonate

A technology of polycarbonate and chloroformic acid, which is applied in the field of polymer material polycarbonate preparation, can solve the problems of affecting the molecular weight distribution of the product, difficult to control the molecular weight of the product, etc., and achieve the effects of short reaction time and simple operation.

Active Publication Date: 2013-12-18
HUNAN HAILI CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the time and method of adding the molecular weight regulator have an impact on the molecular weight or molecular weight distribution of the product, if the monohydric phenol is added too early, the chain segment will be randomly blocked by the molecular weight regulator, and both ends of some small molecular chain segments will be blocked at both ends, which will affect the molecular weight of the product. Molecular weight distribution; if the monohydric phenol is added too late, the molecular weight of the product is difficult to control

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0018] In a 1L four-necked flask, add 200 g of water, 450 g of dichloromethane, 58 g of bisphenol A, and 0.5 g of tetrabutylammonium bromide to prepare 100 g of a 28% (mass percent) NaOH solution for use. In the first stage of the reaction, the temperature of the system is controlled at about 15°C, and the prepared NaOH solution is passed through at the same time. From 3 to 7, stir the reaction for 10 minutes and then rapidly raise the temperature to 25°C. The reaction enters the second stage, and at the same time pass phosgene and drip the unfinished NaOH solution, the speed of passing light is stable at 0.4-0.6L / min, adjust the speed of dropping NaOH solution to control the pH of the system at 10-13, and control the reaction temperature Between 25 and 40°C, after 30 minutes, the lye was added dropwise, the phosgene flow was stopped, and the pH of the system was 11. Add 1.5g of p-tert-butylphenol, continue to stir for 30min, separate the liquids, wash the organic phase with ...

Embodiment 2

[0020] In a 1L four-necked flask, add 200g of water, 450g of dichloromethane, 58g of bisphenol A, and 0.5g of tetrabutylammonium bromide to prepare 100g of 28% (mass percentage) NaOH solution for subsequent use. stage, control the temperature of the system at about 15°C, pass phosgene and drop the prepared NaOH solution at the same time. After reacting for 20 minutes, the temperature was raised rapidly to 25°C, and the reaction entered the second stage. Simultaneously pass phosgene and drip the unfinished NaOH solution, the speed of light passing is stable at 0.4-0.6L / min, adjust the speed control system of dropping NaOH solution The pH is 10-13, and the reaction temperature is controlled between 25-40°C. After 25 minutes, the lye is added dropwise, and the phosgene is stopped. The pH of the system is 11. Add 1.5g of p-tert-butylphenol, continue to stir for 30 minutes, and separate the liquid. The organic phase was first washed with 2% (mass percent) HCl solution, then washed ...

Embodiment 3

[0022] In a 1L four-necked flask, add 200g of water, 450g of dichloromethane, 58g of bisphenol A, and 0.5g of tetrabutylammonium bromide to prepare 100g of 28% (mass percentage) NaOH solution for subsequent use. stage, control the temperature of the system at about 15°C, pass phosgene and drop the prepared NaOH solution at the same time. After reacting for 30 minutes, the temperature was raised rapidly to 25°C, and the reaction entered the second stage. At the same time, the phosgene was passed and the unfinished NaOH solution was added dropwise. The light passing speed was stabilized at 0.4-0.6L / min. The pH is 10-13, the reaction temperature is between 25-40°C, the lye is added dropwise in 18 minutes, the phosgene is stopped, the pH of the system is 11, 1.5g of p-tert-butylphenol is added, and the stirring is continued for 30 minutes, liquid separation, organic The phase was first washed with 2% (mass percent) HCl solution, then washed with 300 g of deionized water until neut...

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Abstract

The invention discloses a method for preparing polycarbonate through interfacial polycondensation reaction of bisphenol A and phosgene. The reaction is divided into two stages including a prepolymerization reaction stage and a quick polymerization reaction stage. The reaction formula of the prepolymerization reaction stage is that n in the formula refers to polymerization degree, n is equal to or smaller than 10, and Z refers to hydroxyl or chloro-carbonic ester. The reaction formula of the quick polymerization reaction stage is that m and n in the formula refer to polymerization degree, n is smaller than or equal to 10, and m is larger than 10. The molecular weight and molecular weight distribution of products can be controlled by adjusting reaction time of the prepolymerization reaction stage and the quick polymerization reaction stage. The preparation method is simple in reaction operation, convenient to control and capable of achieving continuous and automation operation.

Description

technical field [0001] The invention belongs to the technical field of polymer material polycarbonate preparation. Background technique [0002] Polycarbonate (PC) is an odorless, odorless, non-toxic, thermoplastic engineering plastic with excellent comprehensive properties. It has outstanding impact resistance, creep resistance, high tensile strength, high heat resistance and Cold resistance, excellent dielectric properties, excellent shape and color stability, good light transmission, visible light transmittance can reach about 90%, is the only transparent product among the five major engineering plastics. Polycarbonate has been widely used for its excellent performance, and it is also blended with other plastics or materials to prepare alloys and composite materials to expand its application range. At present, the application and development of polycarbonate is tending to the development of compound, multi-functional, specialization and serialization. Many high-tech fie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G64/24
Inventor 熊前政邱德跃肖旭辉臧阳陵彭勇曹仲林
Owner HUNAN HAILI CHEM IND