Unlock instant, AI-driven research and patent intelligence for your innovation.

Production method of polyphenylene ether

A manufacturing method and polyphenylene ether technology, which are applied in the manufacturing field of polyphenylene ether, can solve problems such as unstable state and undisclosed variety changes, and achieve the effects of reducing production volume and stabilizing operation.

Active Publication Date: 2020-07-14
ASAHI KASEI KK
View PDF14 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, regarding the precipitation state during the type change, an unstable state occurs until the composition in the precipitation tank is changed.
[0005] If you look at the existing reports on PPE precipitation, most of them are particle size improvement technologies such as average particle size and fine powder ratio, and there is no disclosure of technology that can efficiently change the type and continue to provide stable production after the type change

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Production method of polyphenylene ether
  • Production method of polyphenylene ether
  • Production method of polyphenylene ether

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0178] Hereinafter, although an Example and a comparative example are given and this embodiment is demonstrated concretely, the scope of this embodiment is not limited to these Examples.

[0179] First, measurement methods for physical properties and characteristics applied to Examples and Comparative Examples are shown below.

[0180] (1) PPE concentration in PPE mixture

[0181] The PPE mixture solution after solution polymerization or concentration process was metered and dispensed to an aluminum tray, and dried at room temperature for 60 minutes. The sample whose surface was in a dry state was placed in a vacuum dryer together with an aluminum pan, the temperature of the vacuum dryer was set to 180° C., the pressure was reduced to 10 torr, and vacuum drying was carried out in this state for 120 minutes. The PPE concentration (mass %) in the PPE mixed liquid was calculated from the sample amount before and after drying.

[0182] (2) Reduced viscosity

[0183] For the 0.5...

manufacture example 1

[0192] In a 40-liter jacketed polymerization tank (the bottom of the polymerization tank is equipped with a nozzle for introducing oxygen-containing gas, a turbine impeller and a baffle, and the exhaust line on the upper part of the polymerization tank is equipped with a reflux condenser), one side is filled with 0.5 L Nitrogen gas was blown in at a flow rate of 4.57 g, 24.18 g of 47 mass % hydrogen bromide aqueous solution, 11.00 g of di-tert-butylethylenediamine, 62.72 g of di-n-butylamine, 149.92 g of butyldimethylamine, 20.65kg of toluene and 3.12kg of 2,6-dimethylphenol were stirred until a uniform solution was formed and the inner temperature of the polymerization tank was 25°C.

[0193] Next, dry air was introduced from the nozzle into the polymerization tank at a rate of 32.8 NL / min to initiate polymerization. Dry air was blown for 140 minutes to obtain a polymerization mixture. In addition, during polymerization, internal temperature was controlled to 40 degreeC. Th...

manufacture example 2

[0198] A PPE polymerization liquid was produced in the same manner as in Production Example 1 except that the ventilation time of the dry air was 90 minutes. The PPE concentration in the obtained PPE polymerization solution was 13.1% by mass. The obtained PPE polymerization liquid is referred to as PPE polymerization liquid (2).

[0199] The reduced viscosity of the polyphenylene ether particles in a dry state obtained in the same manner as in Production Example 1 from a portion of the obtained PPE polymerization solution (2) was 0.323 dL / g.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

An object of the present invention is to provide a method for producing PPE which can greatly reduce troubles such as an increase in fine powder, scale adhesion in a precipitation tank, occurrence amount of transient products at the time of change of a brand, and efficiently obtain PPE With the goal. The process for producing PPE of the present invention comprises a polymerization step of oxidatively polymerizing a phenolic compound in a polymerization solution containing a good solvent of PPE and a catalyst to obtain a PPE mixed solution. The PPE mixed solution, a poor solvent of PPE and water are added to a precipitation tank having a stirrer and mixed to precipitate PPE to obtain a slurry liquid containing PPE particulates. In the precipitation step, the poor solvent of the PPE and the water are added to the precipitation tank through different pipes and the water is in an amount of 0.05 to 30 mass% based on 100 mass% of the poor solvent of the PPE.

Description

technical field [0001] The present invention relates to a production method of polyphenylene ether (hereinafter sometimes abbreviated as "PPE"), and relates to a production method capable of producing high-quality PPE powder with excellent production efficiency. Background technique [0002] Modified PPE resin using PPE as raw material can produce products / parts of desired shape by molding methods such as melt injection molding method or melt extrusion molding method. The material used for the product / part is widely used plastic material. [0003] As a method for producing PPE, there is a method of oxidatively polymerizing a phenolic compound in the presence of a copper compound and amines in a good solvent for PPE. As a method for precipitating PPE from the PPE solution obtained by this method, there is known a method of depositing PPE particles by adding a poor solvent for PPE such as methanol containing water to a PPE solution containing a good solvent for PPE. [0004]...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C08G65/44C08G65/46
CPCC08G65/44C08G65/46C08G2650/56
Inventor 新藤由幸山本繁
Owner ASAHI KASEI KK