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Polyphenylene ether powder and its production method

A manufacturing method and technology for polyphenylene ether, which are applied in the field of polyphenylene ether and its manufacture, can solve the problems of lowering productivity, lowering yield, lowering powder supplying device, etc., and achieves difficult micronization, good handleability, and suppression of jet flow. Effect

Active Publication Date: 2021-02-02
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the continuous operation of the gravimetric feeder, in order to prevent jet flow, the capacity of the powder supply device is often reduced to reduce productivity.
[0005] In addition, when the amount of fine powder in the powder used is large, yield reduction due to fine powder scattering, poor engagement with extruders, etc., and filter failure from the drying process to the air-feeding process may occur. Problems such as blockage

Method used

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  • Polyphenylene ether powder and its production method
  • Polyphenylene ether powder and its production method
  • Polyphenylene ether powder and its production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0216] The present embodiment will be specifically described below with reference to specific examples and comparative examples for comparison therewith, but the present embodiment is not limited to the following examples.

[0217] The measurement methods of the physical properties and characteristics used in Examples and Comparative Examples are as follows.

[0218] (1) Determination of number average molecular weight (Mn)

[0219] As a measuring device, a gel permeation chromatograph System 21 manufactured by Showa Denko Co., Ltd. was used to prepare a calibration curve using polystyrene, and the number average molecular weight (Mn) of the obtained polyphenylene ether powder was measured using the calibration curve.

[0220] As standard polystyrenes, polystyrenes having molecular weights of 3,650,000, 2,170,000, 1,090,000, 681,000, 204,000, 52,000, 30,200, 13,800, 3,360, 1,300, and 550 were used.

[0221] As the column, a column in which two K-805L manufactured by Showa Denko...

manufacture example 1

[0294] 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 top of the polymerization tank is equipped with a reflux cooler), one side is equipped with a 0.5 The flow rate of L / min is blown into nitrogen, while adding 4.57g of divalent copper oxide, 24.18g of 47% by mass hydrogen bromide aqueous solution, 11.00g of di-tert-butylethylenediamine, 62.72g of di-n-butylamine, 149.92 g of butyldimethylamine, 20.65 kg of toluene, and 3.12 kg of 2,6-dimethylphenol were prepared into a uniform solution, and stirred until the inner temperature of the polymerization tank reached 25°C. Next, dry air was introduced from the nozzle into the polymerization tank at a speed 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...

manufacture example 2

[0298] Molecular weight was controlled by changing the polymerization time for 125 minutes for the ventilation time of dry air. Production was carried out in the same manner as in Production Example 1 under other conditions to obtain a polymer solution. The obtained polymer solution was referred to as polymer solution (2).

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Abstract

The present invention provides a polyphenylene ether powder in which micronization due to collisions between particles and jetting properties of the particles are suppressed, and a method for producing the polyphenylene ether powder is excellent in handleability. The polyphenylene ether powder provided by the present invention is characterized in that it contains polyphenylene ether particles with an aspect ratio (DL / DS) of 2.0 to 7.0, where the aspect ratio (DL / DS) is the long diameter of a particle (DL) to short diameter (DS) ratio.

Description

technical field [0001] The present invention relates to a polyphenylene ether having a novel shape and a method for producing the same. Background technique [0002] The particles of resin such as polyphenylene ether are obtained through polymerization steps such as emulsion polymerization, suspension polymerization, and solution polymerization, followed by particle precipitation steps, dry pulverization of resin materials, and the like. Therefore, the resin particles are usually in any form of amorphous or spherical. [0003] For a long time, for the purpose of improving the mechanical properties and handling properties of resin particles, suppressing particle breakage caused by particle collision during mixing and empty feeding, improving cleaning characteristics, and improving feed rate during melt kneading Resin pellets with various forms have been developed for various purposes, such as powder handling in the bucket, and the purpose of improving the lubricity of cosmet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/14C08J3/12C08L71/12
CPCC08J3/12C08J3/14C08J2371/12C08L71/12C08L2205/18C08G65/40
Inventor 福圆真一
Owner ASAHI KASEI KK
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