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Hard polyimide foaming structural material and preparation method thereof

A technology of polyimide and foam structure, which is applied in the field of rigid polyimide foam structure material and its preparation, can solve the problems of restricting the application field of structure material, achieve short preparation process route, good storage stability, easy The effect of industrialization

Inactive Publication Date: 2011-07-20
BEIJING RADIATION APPL RES CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since this method produces CO during the preparation of the precursor solution 2 The gas escapes, and the free foaming method is adopted at the same time. Although the service temperature of the foam is higher than 200°C, the compressive strength is only 0.4-0.7MPa, which also limits its application field as a structural material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Put 148.8 grams of 3,3',4,4'-benzophenone tetra-acid dianhydride into 140 grams of N,N-dimethylformamide, heat to 120°C and fully stir to dissolve it. After 3,3' , After all the solids of 4,4'-benzophenonetetraacid dianhydride are dissolved, add 4.6 grams of polyethylene glycol-10000 to react for 20 minutes. After the end, when the temperature of the solution drops below 50°C, add 12 grams of deionized water, 0.32 grams of stannous octoate, 0.12 grams of triethanolamine, 12 grams of silicone oil AK-8803, and 10 grams of silicone oil DC 193, and stir the above solution to room temperature , A pink viscous polyimide foam precursor solution can be obtained.

[0031] Measure 15 grams of polyimide foam precursor solution, stir quickly with equal mass of polyphenyl polymethylene polyisocyanate, and pour it into the pre-prepared mold after the solution starts to turn white, and carry out under 5MPa pressure Pressurize and foam at room temperature for 10 minutes to obtain a po...

Embodiment 2

[0041] The difference between this example and specific example 1 is that 138.6 grams of 1,2,4,5-pyromellitic anhydride is added to the polar solvent, and the others are the same as in specific example 1 to finally obtain a rigid polyimide Foam structural material.

[0042] The basic performance of the rigid polyimide foam structural material prepared by test embodiment 3 is as follows:

[0043] Density 0.069×10 3 kg / m 3

[0044] Thermal conductivity 0.031W / m·K

[0045] Limiting Oxygen Index 32%

[0046] Shore hardness 64HC

[0047] Compressive strength 1.8MPa

[0048] Tensile strength 2.9MPa

[0049] Heat distortion temperature 325°C

Embodiment 3

[0051] The difference between this embodiment and specific embodiment 2 is that 15 grams of polyimide foam precursor solution is measured, and the diphenylmethane diisocyanate of 18 grams is quickly stirred evenly, and others are the same as specific embodiment 3, and finally a hard polyimide foam is obtained. Quality polyimide foam structural material.

[0052] The basic performance of the rigid polyimide foam structural material prepared by test embodiment 4 is as follows:

[0053] Density 0.047×10 3 kg / m 3

[0054] Thermal conductivity 0.039W / m·K

[0055] Limiting Oxygen Index 29%

[0056] Shore hardness 58HC

[0057] Compressive strength 1.1MPa

[0058] Tensile strength 2.3MPa

[0059] Heat distortion temperature 317℃

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Abstract

The invention discloses a hard polyimide foaming structural material and a preparation method thereof. The method comprises the following steps of: mixing aromatic dianhydride and / or aromatic acid ester, high molecular alcohol, low molecular alcohol, a catalyst and a surfactant according to a ratio into a polar solvent and reacting to form polyimide foam precursor solution; reacting the precursor solution with isocyanate in a die; pressurizing and foaming to form a polyimide foam intermediate; and performing microwave radiation or / and performing heat curing by using an oven to obtain the hard polyimide foaming structural material. The preparation process route is short and the process is simple; the storage stability of the foam precursor solution is high; and the prepared hard polyimide foaming structural material has uniform aperture, hard quality, high strength, low density and high temperature resistance, is non-toxic and environmentally-friendly in the foaming process and easy to industrialize, and can be applied in the fields of electron, carrier rockets, aviation, ships, railway locomotives and the like.

Description

Technical field [0001] The invention relates to the technical field of polymer materials, in particular to a rigid polyimide foam structural material and a preparation method thereof. technical background [0002] As we all know, in the technical field of polymer materials, polyimide foam is one of the most important application forms of polyimide materials. Polyimide foam has good heat insulation and noise reduction performance, heat resistance, radiation resistance and electrical properties, etc., and has been widely used in aviation, aerospace, automobiles, launch vehicles, railway locomotives, ships, electronics and other fields. The research on polyimide foam material began in the mid-1860s, and DuPont Company of the United States first applied for the related patent US3249561. This patent adds a dehydrating agent or a mixture of dehydrating agent / tertiary amine to the polyamic acid solution, and then adds an acid that can generate gas to generate CO or CO 2 Foaming, ...

Claims

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Application Information

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IPC IPC(8): C08G73/10C08J9/08C08L79/08
Inventor 郑艳红王连才郭建梅李光珠翟彤曹魏曾心苗李淑凤鲍矛
Owner BEIJING RADIATION APPL RES CENT
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