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Preparation method of low-molecular-weight polyphenyl ether

A low-molecular-weight, polyphenylene ether technology, applied in the field of preparation of low-molecular-weight polyphenylene ether, can solve the problems of increased polyphenylene ether dispersibility index, uneven redistribution reaction, slow reaction heat transfer, etc. Guaranteed molecular weight controllability and low cost

Active Publication Date: 2015-07-01
LUOYANG INST OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the redistribution reactions of these polyphenylene ethers are all carried out in organic solvents, and the concentration of polyphenylene ethers should not be too high, otherwise, the heat transfer of the reaction will be slow, the solution viscosity will be high, the stirring will be difficult, and the redistribution reactions will be uneven, resulting in the preparation of The dispersibility index of polyphenylene ether becomes larger
After the reaction, the precipitation of polyphenylene ether requires a large amount of polyphenylene ether poor solvent as a precipitating agent, resulting in a large amount of waste liquid, which has a serious impact on the environment

Method used

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  • Preparation method of low-molecular-weight polyphenyl ether
  • Preparation method of low-molecular-weight polyphenyl ether
  • Preparation method of low-molecular-weight polyphenyl ether

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Take 10 parts of polyphenylene ether with a number-average molecular weight of 20000 g / mol and 0.01 parts of initiator BPO and 0.05 parts of bisphenol A (parts by mass) with phenolic hydroxyl groups at the end groups, and stir and dissolve them in toluene solution at 50 ° C to obtain the prepared The reaction solution. Pour the pre-reaction solution into another deionized aqueous solution containing polyvinyl alcohol dispersant at a temperature of 60°C, wherein water is 90 parts (parts by mass), and polyvinyl alcohol dispersant is 0.01% of deionized water (mass percentage), keep stirring, so that the pre-reaction solution is evenly dispersed in deionized water, and the dispersant will be adsorbed on the surface of the small droplets formed by the pre-reaction solution. The reaction proceeded and the reaction was maintained for 3 hours. Then, normal-pressure water vapor was passed into below the liquid level of the stirred mixture for 5 hours. The toluene in the mixed ...

Embodiment 2

[0042] Take 10 parts of polyphenylene ether with a number-average molecular weight of 15000 g / mol having a phenolic hydroxyl group at the end group, 1.5 parts of dicumyl peroxide as an initiator, and 1.5 parts (parts by mass) of monohydric phenol, stir and dissolve in 33.3 parts by mass of xylene solution to obtain a pre-reaction solution. Pour the pre-reaction solution into another deionized aqueous solution containing polyvinylpyrrolidone dispersant at a temperature of 60° C., wherein water is 68 parts (parts by mass), and polyvinylpyrrolidone dispersant is 10% of deionized water (mass percentage), keep stirring, so that the pre-reaction solution is evenly dispersed in deionized water, and the dispersant will be adsorbed on the surface of the small droplets formed by the pre-reaction solution. The reaction proceeded and the reaction was maintained for 3 hours. Then, normal-pressure water vapor was passed into below the liquid surface of the stirred mixture for 20 hours. Th...

Embodiment 3

[0044] Take 10 parts of polyphenylene ether with a number-average molecular weight of 25000 g / mol and 0.01 parts of initiator lauryl peroxide and 0.05 parts of bisphenol A (parts by mass), stir and dissolve in 5000 Chloroform solution of chlorinated hydrocarbons in parts by mass to obtain a pre-reaction liquid. Then the pre-reaction solution is poured into another temperature that contains magnesium carbonate dispersant and is in the deionized aqueous solution of 60 ℃, wherein water is 50000 parts (mass parts), and magnesium carbonate dispersant is 0.01% (mass parts) of deionized water %), stirring continuously, so that the pre-reaction solution is evenly dispersed in the deionized water, and the dispersant will be adsorbed on the surface of the small droplets formed by the pre-reaction solution. The reaction proceeded and the reaction was maintained for 3 hours. Then, normal-pressure water vapor was passed into below the liquid surface of the stirred mixture for 0.5 hour. T...

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Abstract

The invention discloses a preparation method of low-molecular-weight polyphenyl ether. The preparation method of the low-molecular-weight polyphenyl ether comprises the following steps: dissolving high-molecular-weight polyphenyl ether, an initiating agent and a phenol compound in a solvent at a certain temperature for preparing a pre-reaction solution; then adding the pre-reaction solution into water containing a dispersing agent, stirring and dispersing, reacting for a period of time at a certain temperature and then stopping reaction, removing the solvent through steam distillation, filtering or centrifuging and separating, washing, and drying, so that the low-molecular-weight polyphenyl ether is obtained.

Description

technical field [0001] The invention relates to a preparation method of low molecular weight polyphenylene ether. Background technique [0002] There are a large number of benzene ring structures in the molecular chain of polyphenylene ether, which has strong molecular rigidity, high hardness and toughness, small creep, low linear expansion coefficient, excellent dimensional stability, and its glass transition temperature and thermal decomposition temperature The heat distortion temperature and thermal deformation temperature are higher, which is superior to engineering plastics such as polyamide, polycarbonate and ABS resin; and, polyphenylene ether is a non-crystalline resin, the molecular structure has no hydrolyzable groups, and has good water resistance; at the same time, polyphenylene ether There are no strong polar groups in the molecular structure of phenyl ether, and its dielectric constant and dielectric loss are low. Under a wide temperature and frequency range, t...

Claims

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Application Information

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IPC IPC(8): C08G65/48C08G65/44
Inventor 朱新军邹水平张建方
Owner LUOYANG INST OF SCI & TECH
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