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Hard polyimide foam material as well as preparation method and application thereof

A technology of polyimide and foam materials, applied in the field of polyimide foam materials, can solve the problems of unsatisfactory dielectric properties and the like

Pending Publication Date: 2021-04-20
CHANGZHOU TIANSHENG NEW MATERIALS RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But when polyimide foam is used as the aviation field, especially when the aviation vehicle radome material, its dielectric properties are not quite satisfactory, so that the application of polyimide foam in the aviation field has a certain limitation

Method used

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  • Hard polyimide foam material as well as preparation method and application thereof
  • Hard polyimide foam material as well as preparation method and application thereof
  • Hard polyimide foam material as well as preparation method and application thereof

Examples

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preparation example Construction

[0095] The present invention provides a method for preparing the rigid polyimide foam material as described in any one of the above technical solutions or the rigid polyimide foam material described in any one of the above technical solutions, comprising the following steps :

[0096] 1) After mixing the aromatic dianhydride and the solvent, adding low molecular weight alcohol to carry out the first reaction to obtain the first solution;

[0097] After mixing the dianhydride-type end-capping agent and the solvent, adding low-molecular alcohol to carry out the second reaction to obtain the second solution;

[0098] 2) After pre-mixing the first solution and the second solution obtained in the above steps, add fluorine-containing diamine to carry out the third reaction to obtain a polyimide precursor solution;

[0099] 3) After mixing the polyimide precursor solution, the foam stabilizer and the glass fiber obtained in the above steps again, and then removing the solvent, a pow...

Embodiment 1

[0137] (1) Add 20 parts of ODPA to 27 parts of THF, then add 6 parts of CH 3 OH reflux reaction, the temperature is 80°C, the time is 4.5h, and a transparent solution A is obtained;

[0138] (2) Add 8 parts of 5-norbornene-2,3-dicarboxylic anhydride to 10 parts of THF, then add 3 parts of CH 3 OH reflux reaction at a temperature of 60°C for 3 hours to obtain a transparent solution B;

[0139] (3) Cool solution A and solution B to room temperature, and stir and mix at a speed of 300 r / min for 30 minutes. Add 15 parts of 4-fluoro-1,2-phenylenediamine and react again to obtain a polyimide precursor solution at a temperature of 25°C for 3 hours;

[0140] (4) Add 6 parts of OFX-8417 and 1.5 parts of quartz glass fiber into the above precursor solution and stir and mix for 60 minutes at a speed of 500 r / min. Then carry out vacuum drying to remove the solvent, the temperature is 80°C, the time is 3h, and it is ground into a powdery product;

[0141] (5) Spread the powdery product...

Embodiment 2

[0147] (1) Add 22 parts of PMDA to 30 parts of DMF, then add 6 parts of C 2 h 5 OH reflux reaction at a temperature of 90°C for 3 hours to obtain a transparent solution A;

[0148] (2) Add 6 parts of 5-norbornene-2,3-dicarboxylic anhydride to 8 parts of DMF, then add 3 parts of C 2 h 5 OH reflux reaction at a temperature of 65°C for 4 hours to obtain a transparent solution B;

[0149] (3) Cool solution A and solution B to room temperature, and stir and mix at a speed of 350 r / min for 25 minutes. Add 18 parts of 4,4'-[1,4-phenylbis(oxygen)]bis[3-(trifluoromethyl)aniline and react again to obtain a polyimide precursor solution at a temperature of 25°C for 4 hours ;

[0150] (4) Add 8 parts of KF-96 and 3 parts of quartz glass fiber to the above precursor solution and stir and mix for 50 minutes at a speed of 600 r / min. Then carry out vacuum drying to remove the solvent, the temperature is 100°C, the time is 2h, and it is ground into a powder product;

[0151] (5) Spread t...

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Abstract

The invention provides a hard polyimide foam material. The hard polyimide foam material contains glass fibers. The hard polyimide foam material has a porous closed-cell structure; and the glass fibers are compounded in the hard polyimide foam. The hard polyimide foam material provided by the invention contains the glass fibers, and the glass fibers and the polyimide foam matrix have a specific composite structure, so that the dielectric constant and the dielectric loss of the hard polyimide foam material can be reduced, and the effect of enhancing the mechanical property of the polyimide foam material is also achieved. The dielectric constant and the dielectric loss of the hard polyimide foam material are reduced by the two modes, namely chemically designing and modifying a polymer body structure, and physically modifying by adding a modifier into a system. In addition, polyimide is subjected to specific structural design, so that the purpose of reducing the dielectric constant is better achieved, and the polyimide can be used as an aircraft radome material.

Description

technical field [0001] The invention belongs to the technical field of polyimide foam materials, and relates to a rigid polyimide foam material and its preparation method and application, in particular to a special rigid polyimide foam material for aviation with outstanding dielectric properties and Its preparation method and application. Background technique [0002] The radome is a wave-transmitting device, which has multiple functions such as flow diversion, heat protection, wave penetration, and load bearing. With the development of aerospace technology and the needs of modern warfare, the flight Mach number of aerospace vehicles continues to increase, where the aerodynamic force and aerodynamic heat of the aircraft are the largest, and the radome at the highest position must withstand higher temperatures and thermal shocks. The material used for the cover places high demands on it. Not only must it have low dielectric constant and dielectric loss, but the dielectric c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/12C08K7/14C08J9/00C08L79/08
Inventor 周光远聂赫然黄志成周鹤顾铭茜
Owner CHANGZHOU TIANSHENG NEW MATERIALS RES INST CO LTD
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