Method for degrading polyimide material by microwaves

The invention belongs to the field of recycling and recycling of waste high polymer materials, and particularly relates to a method for degrading a polyimide material by microwaves. The method comprises the following steps: preparing the polyimide waste, a solvent and a catalyst into a degradation s...

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Main Authors HOU XIANGLIN, WANG YUQI, MAO YIXUAN, TIAN ZISHANG
Format Patent
LanguageChinese
English
Published 07.09.2021
Subjects
ACYCLIC OR CARBOCYCLIC COMPOUNDS
CHEMISTRY
METALLURGY
ORGANIC CHEMISTRY
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Abstract The invention belongs to the field of recycling and recycling of waste high polymer materials, and particularly relates to a method for degrading a polyimide material by microwaves. The method comprises the following steps: preparing the polyimide waste, a solvent and a catalyst into a degradation system, and putting the degradation system into a microwave reactor for degradation reaction. filtering after degradation is completed, and adding deionized water to wash a filter cake to obtain aromatic diamine; and evaporating out the solvent from washing liquid, adding hydrochloric acid to precipitate the aromatic pyromellitic acid, and filtering and drying to obtain aromatic pyromellitic acid. According to the present invention, the alkaline catalyst is utilized to selectively break the imide bond under the microwave condition to obtain pyromellitic acid and 2, 2 '-diaminodiphenyl ether, and the method has advantages of low recovery cost, mild reaction condition, normal pressure degradation, and easy separation
AbstractList The invention belongs to the field of recycling and recycling of waste high polymer materials, and particularly relates to a method for degrading a polyimide material by microwaves. The method comprises the following steps: preparing the polyimide waste, a solvent and a catalyst into a degradation system, and putting the degradation system into a microwave reactor for degradation reaction. filtering after degradation is completed, and adding deionized water to wash a filter cake to obtain aromatic diamine; and evaporating out the solvent from washing liquid, adding hydrochloric acid to precipitate the aromatic pyromellitic acid, and filtering and drying to obtain aromatic pyromellitic acid. According to the present invention, the alkaline catalyst is utilized to selectively break the imide bond under the microwave condition to obtain pyromellitic acid and 2, 2 '-diaminodiphenyl ether, and the method has advantages of low recovery cost, mild reaction condition, normal pressure degradation, and easy separation
Author TIAN ZISHANG
MAO YIXUAN
WANG YUQI
HOU XIANGLIN
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Snippet The invention belongs to the field of recycling and recycling of waste high polymer materials, and particularly relates to a method for degrading a polyimide...
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CHEMISTRY
METALLURGY
ORGANIC CHEMISTRY
Title Method for degrading polyimide material by microwaves
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