Modified polyimide-based wave-absorbing material for microwave dark chamber, wave-absorbing structure and preparation method

A polyimide-based, microwave anechoic chamber technology is applied in the field of wave absorbing materials to achieve the effects of improving heat insulation effect, improving comprehensive performance and improving mechanical performance

Active Publication Date: 2021-03-26
贵州航天建设工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above patents either only use a single absorbing medium, or only improve the absorbing pyramid
At present, a kind of absorbing material with excellent comprehensive performance and high absorption rate for electromagnetic waves and sound waves has not yet been obtained.

Method used

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  • Modified polyimide-based wave-absorbing material for microwave dark chamber, wave-absorbing structure and preparation method
  • Modified polyimide-based wave-absorbing material for microwave dark chamber, wave-absorbing structure and preparation method
  • Modified polyimide-based wave-absorbing material for microwave dark chamber, wave-absorbing structure and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 1) Preparation of polyimide foam precursor composite absorbing material absorbing pyramid

[0048] In parts by mass, 85% polyimide foaming precursor, 0.2% tetrahydrofuran, 8% modified carbon nanotubes, 2.8% magnetic iron nanomaterials, 4% retinyl Schiff alkali metal Salt complexes, 100% in total, are fully mixed and dried, placed in a pyramidal foaming mold with a first preheating temperature of 80°C for 0.5h, and then the temperature is raised to the second foaming temperature of 140°C, and kept warm 3h; then raise the temperature to the third imidization temperature of 300°C, and keep it warm for 2h; after the warming is over, lower it to room temperature, and then prepare a polyimide foaming precursor composite wave-absorbing material wave-absorbing pyramid.

[0049] 2) Preparation of modified aluminum foam

[0050]In parts by mass, 90% of aluminum powder, 4% of modified carbon nanotubes, 3% of magnetic iron nano-magnetic beads, 1% of silicon carbide, and 2% of tita...

Embodiment 2

[0054] 1) Preparation of polyimide foam precursor composite absorbing material absorbing pyramid

[0055] In parts by mass, 88% polyimide foaming precursor, 0.5% tetrahydrofuran, 2.5% modified carbon nanotubes, 6% magnetic iron nanomaterials, 3% retinyl Schiff alkali metal Salt complexes, 100% in total, are fully mixed and dried, placed in a pyramidal foaming mold with the first preheating temperature of 85°C for 0.4h, then raised to the second foaming temperature of 142°C, and kept warm 2.7h; then raise the temperature to the third imidization temperature of 305°C, and keep it warm for 1.8h; after the heat preservation is over, lower it to room temperature, and then prepare a polyimide foaming precursor composite wave-absorbing material absorbing pyramid .

[0056] 2) Preparation of modified aluminum foam

[0057] In parts by mass, 91% of aluminum powder, 3% of modified carbon nanotubes, 1.5% of magnetic iron nano-magnetic beads, 3% of silicon carbide, and 1.5% of titanium ...

Embodiment 3

[0061] 1) Preparation of polyimide foam precursor composite absorbing material absorbing pyramid

[0062] In parts by mass, 93% polyimide foaming precursor, 0.8% tetrahydrofuran, 5.6% modified carbon nanotubes, 0.5% magnetic iron nanomaterials, 0.1% retinyl Schiff alkali metal Salt complexes, 100% in total, are fully mixed and then dried, placed in a pyramidal foaming mold with a first preheating temperature of 95°C for 0.2h, then raised to the second foaming temperature of 145°C, and kept warm 2.5h; then raise the temperature to the third imidization temperature of 315°C, and keep it warm for 1.5h; after the heat preservation is over, lower it to room temperature, and then a polyimide foaming precursor composite wave-absorbing material wave-absorbing pyramid is prepared. .

[0063] 2) Preparation of modified aluminum foam

[0064] In terms of parts by mass, 93% of aluminum powder, 2.5% of modified carbon nanotubes, 2% of magnetic iron nano-magnetic beads, 1.5% of silicon ca...

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Abstract

The invention discloses a modified polyimide-based wave-absorbing material for a microwave dark chamber, and the wave-absorbing material is composed of a polyimide foaming precursor composite wave-absorbing material and modified foamed aluminum; a wave-absorbing pyramid is made of the polyimide foaming precursor composite wave-absorbing material, the wave-absorbing pyramid is adhered to a modifiedfoamed aluminum plate through an adhesive, a foamed aluminum plate is fixed on the other surface of the modified foamed aluminum plate through long nails, a gap exists between the modified foamed aluminum plate and the foamed aluminum plate, and aerogel is filled in the gap. The wave-absorbing material has the beneficial effects that: various wave-absorbing medium materials are adopted to form the wave-absorbing pyramid together, so that the wave-absorbing performance of the composite material at each frequency is effectively improved; the foamed aluminum is modified by adopting the wave-absorbing medium, so that the wave-absorbing capacity is improved, and meanwhile, the foamed aluminum has excellent sound insulation performance; an interlayer between the modified foamed aluminum and common foamed aluminum is filled with aerogel, so that the heat insulation performance is improved.

Description

technical field [0001] The invention belongs to the field of wave-absorbing materials, and relates to a wave-absorbing material for a microwave darkroom based on a modified polyimide group, a wave-absorbing structure and a preparation method thereof. Background technique [0002] The microwave anechoic chamber is to use absorbing materials to create a closed space, create a pure electromagnetic environment, and eliminate external electromagnetic interference. It is a place for testing wireless communication products and electronic products such as antennas and radars. The test products can be free from clutter interference. Improve the test accuracy and efficiency of the device under test. At present, microwave anechoic chambers mostly use ferrite magnets / expanded polystyrene, ferrite / expanded polypropylene, etc. as absorbing pyramid materials, and the materials are mostly B2 flame-retardant materials, which are not safe. At the same time, the absorbing performance of a sin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B15/08B32B15/20B32B27/28B32B9/00B32B9/04B32B7/08B32B7/12B32B3/30B32B37/12B32B37/00C08L79/08C08K13/06C08K9/02C08K3/04C08K3/22C08K5/00C08J9/00H05K9/00
CPCB32B3/30B32B5/18B32B5/20B32B5/245B32B7/08B32B7/12B32B37/12B32B2250/22B32B2266/0214B32B2266/045B32B2307/102B32B2307/212B32B2307/306B32B2307/3065B32B2266/126C08J9/0014C08J9/0066C08J9/009C08J9/0095C08J2379/08C08K3/22C08K5/0091C08K9/02C08K13/06C08K2003/2275C08K2201/01C08K2201/011C08K3/041H05K9/0081H05K9/0083
Inventor 罗正权胡渊李英章伍鑫杨云鹏夏林灿骆金科王建李怀柱黄春洪伍小季朱伟官忠臣杨军李小东朱宇翔朱丽娟梁鹏志
Owner 贵州航天建设工程有限公司
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