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Method for producing aromatic polycarbonate

A technology of polycarbonate and a manufacturing method, which is applied in the manufacturing field of aromatic polycarbonate, can solve problems such as device corrosion, fluctuation, and difficulty in separating sodium chloride and dichloromethane, and achieves the effect of easy pressure control

Active Publication Date: 2019-12-03
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Compared with the melt polymerization method, the interfacial polymerization method has the following problems: it is necessary to use toxic phosgene; the device is corroded by chlorine-containing compounds such as hydrogen chloride and sodium chloride, which are by-produced, and dichloromethane used as a solvent in large quantities ; It is difficult to separate impurities such as sodium chloride or residual methylene chloride that adversely affect the physical properties of the polymer; etc.
However, in the latter case, it is known that if the feed molar ratio of diaryl carbonate and aromatic dihydroxy compound changes, the ratio of polymer terminal hydroxyl groups in the prepolymer or polymer changes, so frequent adjustments are required. The pressure of the polymerizer is set to the target molecular weight and the amount of terminal hydroxyl groups

Method used

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  • Method for producing aromatic polycarbonate
  • Method for producing aromatic polycarbonate
  • Method for producing aromatic polycarbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0210] use figure 1 Fabrication setup shown. More specifically, a mixing tank 7 with a diameter of 3.8 m and an internal volume of 80 m was used. 3 A vertical mixing tank with 2-stage impeller blades. To the upper part of the mixing tank 7, a pipe nozzle for feeding an aromatic dihydroxy compound with a flange part having an inner diameter of 400 mm was connected. exist figure 2 The stand-alone gantry 20 setup shown has an internal capacity of 90m 3 The metering tank 2 and load cell 3. The independent stand 20 is built on an independent base, and is provided with flexible electrical wiring, cables for instruments, and piping. The windshield stand (not shown) is a building built on a base manufactured independently from the base of the stand-alone stand 20 on the outside of the stand-alone stand 20, and supports such as piping are attached thereto. Metering tank 2 is connected with a displacement of 150Nm 3 / h is an exhaust control valve used to control the internal pre...

Embodiment 2

[0228] An aromatic polycarbonate was produced in the same manner as in Example 1, except that the large supply amount of DPC was changed to 21.3 tons (86.2% by mass) and the small supply amount was changed to 3.41 tons. The results are listed in Table 1.

Embodiment 3

[0230] The capacity in use is 90m 3 An aromatic polycarbonate was produced in the same manner as in Example 1, except that the metering tank was not provided on an independent stand but on a non-independent stand, that is, a stand sharing a base with the mixing tank. The indicated value of the load cell 3 is affected by external vibration or wind, and there is an error in the amount of BPA supplied to the mixing tank 7 . Therefore, the feeding molar ratio of DPC and BPA deviates, and compared with Example 1, the adjustment range of the pressure of the main polymerizers 18A and 18B is slightly larger, and it is found that the MI and OH% of the produced aromatic polycarbonate are relatively large. small changes. The results are listed in Table 1.

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Abstract

The invention provides a preparing method of aromatic polycarbonate. According to the invention, aromatic polycarbonate is prepared via reaction between aromatic dyhydroxy compound and carbonic acid diaryl ester. The method comprises following steps of (A) supplying the carbonic acid diaryl ester of 90 DEG C-220 DEG C to a mixing groove, wherein the supply quantity of the carbonic acid diaryl ester is 75m%-99m% of total supply quantity of the carbonic acid diaryl ester solved via target molar ratio of the aromatic dyhydroxy compound and the carbonic acid diaryl ester; (B) after the step A, supplying the aromatic dyhydroxy compound to the mixing groove whose liquid temperature is adjusted to 135 DEG C-220 DEG C; and (C) after the step (B), further supplying the carbonic acid diaryl ester to the mixing groove so as to allow the molar ratio of the aromatic dyhydroxy compound and the carbonic acid diaryl ester to be in a regulated range, thereby preparing dissolution mixture.

Description

【Technical field】 [0001] The present invention relates to a method for producing aromatic polycarbonate. 【Background technique】 [0002] It is well known that aromatic polycarbonates are excellent in impact resistance, transparency, and the like. As a method for producing an aromatic polycarbonate, there is a method in which an aromatic dihydroxy compound and a diaryl carbonate are reacted at high temperature and reduced pressure in the presence of a transesterification catalyst, and the resulting aromatic polycarbonate is A melt polymerization method in which a hydroxy compound is discharged out of the system; and an interfacial polymerization method in which an aromatic dihydroxy compound and phosgene are reacted in a mixed solution of an organic solvent and an aqueous alkali solution. [0003] Compared with the melt polymerization method, the interfacial polymerization method has the following problems: it is necessary to use toxic phosgene; the device is corroded by chl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G64/30
Inventor 长谷川和美
Owner ASAHI KASEI KK
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