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Microwave-assisted method for preparing polyimide foam material

A technology of polyimide and foam materials, applied in coating and other directions, can solve the problems of large impact on industrialization efficiency and cost, complicated high-temperature curing, long foaming time, etc., and achieve easy mass production and preparation process. Simple, moisture absorption reduction effect

Inactive Publication Date: 2020-09-22
GUIZHOU AEROSPACE TIANMA ELECTRICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the free foaming time of this method is too long, and the high temperature curing is complicated, resulting in serious energy consumption in the later stage, which has a great impact on industrialization efficiency and cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The present embodiment provides a kind of microwave-assisted production method for preparing polyimide foam material, specifically comprises the following steps:

[0038] (1) Preparation of lipidation solution: mix 3,3',4,4'-benzophenone tetracarboxylic dianhydride, N,N-dimethylformamide, and methanol at 5:5:1.5, At 75°C, the esterification reaction is complete, and the lipidated liquid is cooled for later use;

[0039] (2) Preparation of the foaming precursor: mix the esterification solution in step (1) with 3,3',4,4'-benzophenone tetracarboxylic dianhydride, water, triethanolamine, dipropylene glycol, Organotin, tetramethicone, and polyethylene glycol are mixed and stirred at 60:55:3:3:4:3 until fully obtained to obtain a foaming precursor;

[0040] (3) Foaming: Add polyphenyl polymethylene polyisocyanate to the foaming precursor in step (2) and stir, then quickly transfer to the mold for molding;

[0041] (4) Curing: Demoulding the foamed product in step (3), placi...

Embodiment 2

[0044] The present embodiment provides a kind of production method for preparing polyimide foam material, specifically comprises the following steps:

[0045] (1) Preparation of lipidation solution: mix 3,3',4,4'-benzophenone tetracarboxylic dianhydride, N,N-dimethylformamide, and methanol at 8:6:2.5, The lipidation reaction is complete at 90°C, and the lipidated liquid is cooled for later use;

[0046] (2) Preparation of the foaming precursor: mix the esterification solution in step (1) with 3,3',4,4'-benzophenone tetracarboxylic dianhydride, water, triethanolamine, dipropylene glycol, Organotin, tetramethicone, and polyethylene glycol are mixed and stirred according to 70:75:2:3:5:3 until fully obtained to obtain a foaming precursor;

[0047] (3) Foaming: Add polyphenyl polymethylene polyisocyanate to the foaming precursor in step (2) and stir, then quickly transfer to a mold for molding.

[0048] (4) Curing: Remove the foamed product in step (3) and place it in a microwav...

Embodiment 3

[0051] The present embodiment provides a kind of production method for preparing polyimide foam material, specifically comprises the following steps:

[0052] (1) Preparation of lipidation solution: mix 3,3',4,4'-benzophenone tetracarboxylic dianhydride, N,N-dimethylformamide, and methanol at 9:7:3, The lipidation reaction is complete at 90°C, and the lipidated liquid is cooled for later use;

[0053] (2) Preparation of the foaming precursor: mix the esterification solution in step (1) with 3,3',4,4'-benzophenone tetracarboxylic dianhydride, water, triethanolamine, dipropylene glycol, Organotin, tetramethicone, and polyethylene glycol are mixed and stirred at a ratio of 100:90:3:3:5:2.5 until fully obtained to obtain a foaming precursor;

[0054] (3) Foaming: Add polyphenyl polymethylene polyisocyanate to the foaming precursor in step (2) and stir, then quickly transfer to a mold for molding.

[0055] (4) Curing: Remove the foamed product in step (3) and place it in a microw...

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PUM

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Abstract

The invention belongs to the technical field of polyimide foam material preparation, and particularly relates to a microwave-assisted method for preparing a polyimide foam material. The method comprises the following steps of: taking aromatic binary anhydride, a polar solvent and low-molecular alcohol as the reaction raw materials, and taking an initiator, a catalyst, a surfactant, a foaming agentand isocyanate as auxiliary materials, carrying out foaming to prepare a foaming solution, then carrying out microwave heating for shaping, and performing drying to obtain the polyimide foam material. The preparation process is simple, the manufacturing cost is low, the imidization conversion rate is high, industrial production is easy, and the prepared polyimide foam material has the advantagesof low heat conductivity coefficient, excellent flame retardant properties, small moisture absorption rate, good corrosion resistance, smoke and mould resistance, good sound absorption properties andthe like.

Description

technical field [0001] The invention belongs to the technical field of polyimide foam material preparation, and in particular relates to a microwave-assisted method for preparing polyimide foam material. Background technique [0002] Polyimide foam is a kind of lightweight porous material with specific chemical structure, high and low temperature resistance, and no harmful gas release. It has low thermal conductivity, high noise reduction coefficient, thermal stability, heat insulation, flame retardancy and low combustion. It has many excellent properties such as smoke toxicity, and has comprehensive properties that other polymer foam materials cannot match. Therefore, it has been widely used in high-end technical fields such as spacecraft, aircraft, weaponry, high-speed trains, and ships. [0003] Polyimide foam was first successfully developed by NASA Angley Research Center and UnitikaAmerica, and used as a thermal insulation material for space shuttle bulkheads. It has be...

Claims

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Application Information

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IPC IPC(8): C08G73/10C08J9/08C08J9/36C08L79/08
CPCC08G73/1035C08J9/08C08J9/36C08J2379/08C08J2203/02
Inventor 黄成进史建超柴鲜花刘方辉杨大磊
Owner GUIZHOU AEROSPACE TIANMA ELECTRICAL TECH