Polyimide foam and method of producing the same

A polyimide and foam technology, applied in the field of polymer materials, can solve problems such as complex process, difficult control of foam intermediate solution, and limited application range

Active Publication Date: 2009-04-08
BEIJING RADIATION APPL RES CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polyimide foam obtained by this method has good overall performance, but the method is complicated, the intermediate solution for

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Put 92.4 grams of 1,2,4,5-pyromellitic anhydride into 140 grams of dimethylformamide and stir well. When the solids of 1,2,4,5-pyromellitic anhydride are all dissolved, the solution becomes After clarification, add 11 grams of anhydrous methanol and 7 grams of low molecular weight polyethylene glycol (PEG-600). After the temperature of the solution naturally drops below 45°C, add 10 grams of deionized water and 18 grams of surfactant AK-168. , 0.5 grams of triethanolamine, 0.2 grams of stannous octoate. Stir the above solution to a constant temperature to obtain a pink viscous foam precursor solution.

[0023] Measure 15 grams of foam precursor solution, and stir quickly with equal mass of polyphenyl polymethylene polyisocyanate. After the solution starts to turn white, pour it into the pre-prepared mold, foam freely for 2-3 minutes, and the foam will be removed. After sticking, put it in a microwave device for 30-45 minutes to form a foam intermediate, then put the foam in...

Embodiment 2

[0031] Put 68.2 grams of 3,3',4,4'-benzophenonetetracarboxylic dianhydride into 140 grams of dimethylformamide and stir thoroughly, gradually heat to 120°C, stay for 20 minutes, and then cool to below 80°C. Add 9.8 grams of anhydrous methanol and 9 grams of low molecular weight polyethylene glycol (PEG-1000). When the temperature of the solution naturally drops below 50°C, 10 deionized water, 15 grams of surfactant DC193, 0.6 grams of triethanolamine, and 0.2 grams of stannous octoate are sequentially added to the above solution. The above solution was stirred to a constant temperature to obtain a light brown foam precursor solution.

[0032] Measure 20 grams of foam precursor solution, quickly stir with 18 grams of isophorone diisocyanate, and pour the solution into the pre-prepared mold after the solution starts to turn white, foam freely for 3-5 minutes, and put in after the foam is debonded Set in microwave equipment for 30-45 minutes to obtain foam intermediates, then put the...

Embodiment 3

[0040] Put 74.6 grams of 3,3',4,4'-bipyromellitic dianhydride into 100 grams of dimethylformamide and stir well, gradually heat to 120°C, wait for the solids to dissolve, stay for 20 minutes, and then cool down To below 80°C, add 6 anhydrous methanol and 4.5 grams of low molecular weight polyethylene glycol (PEG-400). When the temperature of the solution naturally drops below 45°C, add 6 grams of deionized water, 11 grams of surfactant DC193, 0.3 grams of triethylene diamine, and 0.15 grams of dibutyl tin dilaurate. Stir the above solution to a constant temperature to obtain a brown-red viscous foam precursor solution.

[0041] Measure 20 grams of foam precursor solution, and stir quickly with equal mass of polyphenyl polymethylene polyisocyanate. After the solution starts to turn white, pour it into the pre-prepared mold and foam freely for 3-5 minutes. After sticking, put it in a microwave device for 30-50 minutes to form a foam intermediate, then put the foam intermediate into ...

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Abstract

The invention discloses polyimide foam and a preparation method thereof. Aromatic dianhydride and/or aromatic acid ester, alcohol with low molecular, a catalyst and a surface active agent are mixed proportionally in a polar solvent and react so as to form foam precursor solution. The foam precursor solution and isocyanate react in a mould and freely foam into a foam intermediate. The intermediate is solidified by microwave radiation or/and oven heating to obtain solid polyimide foam. The preparation process has short path, simple technology, good stability for storage of the foam precursor solution, adaptation to processing technologies of pouring, spray coating, extrusion, and the like, no occurrence of defects of cracked foam, foam combination, subsidence and incomplete amination, low preparation cost as well as uniform hold diameter and stable performance of the solid polyimide form, and is convenient for popularization and application.

Description

Technical field [0001] The invention relates to the field of polymer materials, in particular to a polyimide foam and a preparation method thereof. technical background [0002] Polyimide foam is one of the most important application forms of polyimide materials. Polyimide is an aromatic heterocyclic polymer with comprehensive properties such as high strength, self-flame retardant, high temperature / low temperature resistance, solvent resistance, oxidation resistance, radiation resistance, and excellent dielectric properties. Polyimide in the form of foam is not only It maintains the excellent performance of the original polymer, and also has the characteristics of light weight, low thermal conductivity, heat insulation, sound absorption, and high flexibility. Therefore, polyimide foam is often used in high-tech fields such as aircraft, ships, military industry, and electronics as a heat-insulating and sound-absorbing material that is resistant to high temperatures and low tempera...

Claims

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Application Information

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IPC IPC(8): C08J9/02C08L79/08C08G73/10
Inventor 王连才曾心苗李淑凤鲍矛郭建梅翟彤曹巍
Owner BEIJING RADIATION APPL RES CENT
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