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High performance composite material for aerospace craft radar radome and preparation method thereof

A technology for radomes and aerospace vehicles, applied in the field of polymer materials, can solve problems such as low dielectric constant, and achieve the effects of low dielectric constant, low dielectric loss, and improved heat resistance stability

Inactive Publication Date: 2018-07-27
NANJING CHUQING ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above technical problems, the present invention provides a high-performance composite material for aerospace vehicle radome and its preparation method, to solve the problem of having good mechanical properties, heat resistance and wide-band wave-transparency and at extremely high temperature and frequency The range of variation still maintains the requirements of low dielectric constant, low electrical loss and the problem of being suitable for preparing radomes of various shapes

Method used

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  • High performance composite material for aerospace craft radar radome and preparation method thereof
  • High performance composite material for aerospace craft radar radome and preparation method thereof
  • High performance composite material for aerospace craft radar radome and preparation method thereof

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Effect test

Embodiment 1

[0024] One, embodiment 1 polyimide

[0025] The ratio of various components involved in polyimide

[0026] The components participating in the polyimide were polymerized according to the molar ratios in Table 1 to obtain polyimides I to III.

[0027] Table 1 Polyimides I-III polymerized by various components in different molar ratios

[0028]

Embodiment 2

[0029] The preparation of embodiment 2 high-performance composite material I

[0030] Step one, will and N,N-dimethylacetamide into the reaction kettle, feed high-purity nitrogen bubbles to remove oxygen, and stir until After dissolving, add dry pyromellitic dianhydride, pyromellitic dianhydride and The molar ratio is 1:1, The mass percent concentration of the sum of the mass of pyromellitic dianhydride and pyromellitic dianhydride in the reaction system is 15%, the temperature of the reaction system is controlled at 15-40°C, and the polymerization reaction is carried out for 5-30 hours to obtain polyamic acid;

[0031] Step 2. Add acetic anhydride and pyridine to the polyamic acid obtained in step 1. The molar ratio of pyromellitic dianhydride, acetic anhydride and pyridine is 1:5:5. Stir while raising the temperature. Raise the temperature to 60-85°C at a rate of 1 min, and carry out imidization reaction. After 12-24 hours of reaction, the reaction is completed, and t...

Embodiment 3

[0036] The preparation of embodiment 3 high-performance composite material II

[0037] Step one, will and N,N-dimethylacetamide into the reaction kettle, feed high-purity nitrogen bubbles to remove oxygen, and stir until After dissolving, add dry pyromellitic dianhydride, pyromellitic dianhydride and The molar ratio is 1:1.5, The mass percent concentration of the sum of the mass of pyromellitic dianhydride and pyromellitic dianhydride in the reaction system is 20%, the temperature of the reaction system is controlled at 15-40°C, and the polymerization reaction is carried out for 5-30 hours to obtain polyamic acid;

[0038] Step 2. Add acetic anhydride and pyridine to the polyamic acid obtained in step 1. The molar ratio of pyromellitic dianhydride, acetic anhydride and pyridine is 1:10:10. Stir while raising the temperature. Raise the temperature to 60-85°C at a rate of 1 min, and carry out imidization reaction. After 12-24 hours of reaction, the reaction is completed, ...

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Abstract

The invention discloses a high performance composite material for an aerospace craft radar radome. The high performance composite material is prepared by polyimide doped quartz glass fiber. The structural formula of polyimide is defined as the specification, compared with the prior art, in the high performance composite material for the aerospace craft radar radome, quartz fiber is used as a reinforcing material, quartz fiber and polyimide are mixed in order to form the composite material, the composite material has low dielectric constant and loss tangent, dielectric properties are not obviously changed along with temperatures and frequencies; the product has excellent thermal shock resistance and high temperature resistance performance, enough mechanical strength, proper elastic modulus,and particle cloud erosion preventing capability, in order to realize wide screen wave permeability of the radome.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a high-performance composite material used for a radome of an aerospace vehicle and a preparation method thereof. Background technique [0002] Aerospace and aerospace wave-transparent materials are multi-functional dielectric materials that protect the communication, telemetry, guidance, and other systems of aircraft under harsh environmental conditions. They are widely used in aircraft radio systems such as launch vehicles, spacecraft, missiles, and returnable satellites. According to its structure, the wave-transparent material is divided into antenna window and radome. The antenna window is located on the side of the aircraft, usually flat or curved. The radome is located on the head of the aircraft, mostly conical or hemispherical. It has multiple functions such as current diversion, heat protection, wave penetration, and load bearing; the radome is an important barrier to p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/08C08K7/14C08G73/10
CPCC08K7/14C08G73/1071C08L79/08
Inventor 杨丽芳
Owner NANJING CHUQING ELECTRONICS TECH CO LTD
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