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Core-shell type lightweight broad-band composite wave-absorbing material and preparation method thereof

A composite wave absorbing material and composite material technology are applied in the field of core-shell type light-weight broadband composite wave absorbing materials and their preparation, which can solve the problem that the effective absorption frequency band of wave absorbing coatings is not wide, the amount of carbonyl iron powder is large, and the wave absorbing performance is poor. Not ideal, etc., to avoid military strikes, prevent harm to the human body, and achieve the effect of small density

Inactive Publication Date: 2008-08-06
EAST CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The above research has the following problems: (1) The wave-absorbing performance is not ideal, which is mainly reflected in the fact that the effective absorption frequency band of the thinner wave-absorbing coating is not wide. Others are only about 4GHz; (2) The coating density is too high, generally at 5.0kg / m 3 The above is mainly because the amount of carbonyl iron powder is too much, and the coating thickness is too thick. The ideal coating density should be 3.5kg / m 3 Within, the thickness is not less than 1.0mm

Method used

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  • Core-shell type lightweight broad-band composite wave-absorbing material and preparation method thereof
  • Core-shell type lightweight broad-band composite wave-absorbing material and preparation method thereof

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Embodiment 1

[0017] 1. Preparation of CIP / PMMA composites

[0018] Take 10 grams of carbonyl iron powder (CIP), add carbonyl iron powder (CIP) to 50 ml of ethyl acetate solution containing γ-aminopropyltriethoxysilane coupling agent, and stir vigorously to obtain silane coupling agent treatment Processed CIP; add the treated CIP to ethanol aqueous solution, ultrasonically disperse and stir, then add methyl methacrylate, when the temperature rises to 65°C, dropwise add ammonium persulfate aqueous solution to initiate the reaction (2h drops), and keep warm for 1h After the reaction was over, the obtained solid was washed with hydrochloric acid and distilled water, dried in an oven at 80°C for 12 hours, ground for 15 minutes, and magnetically separated to obtain a CIP / PMMA composite material, so that the mass percentage of CIP and PMMA was 33:67.

[0019] 2. Preparation of CIP / PMMA / PANI double-layer coated core-shell composites

[0020] The CIP / PMMA composite material that makes in the 1st s...

Embodiment 2

[0025] The mass percentage of present embodiment CIP and PMMA is 40: 60, the mass percentage of CIP / PMMA and PANI is 70: 30, the mass percentage of CIP / PMMA / PANI and paraffin is 50: 50; In the preparation of CIP / PMMA composite material During the process, after adding methyl methacrylate, when the temperature rises to 65-70°C, ammonium persulfate is added dropwise; the aqueous solution initiates the reaction, and the reaction ends after 1-1.5 hours of heat preservation, and the obtained solid is washed with hydrochloric acid and distilled water and placed in 80 Dry in an oven at ~85°C for 10-12 hours, grind for 15-20 minutes, and magnetically separate to obtain the CIP / PMMA composite material. During the preparation process of CIP / PMMA / PANI double-layer coated core-shell composite material, ammonium persulfate aqueous solution was added dropwise, the temperature was controlled at 8-10°C, after the reaction was completed, it was filtered and washed with absolute ethanol and dist...

Embodiment 3

[0027] In this embodiment, the mass percent of CIP and PMMA is 35:65, the mass percent of CIP / PMMA and PANI is 65:35, the mass percent of CIP / PMMA / PANI and paraffin is 40:60, other process methods and parameters and embodiments 2 is the same.

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Abstract

The invention discloses shell-core lightweight wide band composite absorbing material and a preparation process. The composite absorbing material is formed by carbonyl iron powder (CIP), polymethyl methacryate (PMMA), polyaniline (PANI) and paraffine, wherein CIP, PMMA and PANI form a double-covered shell-core structure which is mixed with paraffine to produce into lightweight wide band composite absorbing material. The composite absorbing material has the double-covered shell-core structure, not only has magnet loss layer, but also has electricity loss layer, and is provided with a transmitted wave layer between the magnet loss layer and the electricity loss layer, which significantly increases wide brand absorbing property. Reflectance is smaller -7Db in the testing frequency range of 2-18 GHz, the continuous band width whose reflectance is smaller -10dB reaches to 10.2 GHz, thereby the composite absorbing material has excellent wide band absorbing property, and has smaller density, realizes the prevention of electromagnetic radiation from damaging human bodies and affecting to devices, simultaneously can interfere the detection of radar which makes military target avoid the military attacks.

Description

technical field [0001] The invention belongs to the technical field of composite functional materials, and relates to a core-shell lightweight broadband composite wave-absorbing material and a preparation method thereof. Background technique [0002] With the rapid development of the economy, electronics, communications, computers and electrical equipment have entered the home, resulting in the increase of man-made electromagnetic energy in urban space year by year, making the electromagnetic environment in a limited space worse. Electromagnetic radiation (electromagnetic wave frequency is generally within 5GHz) has been Becoming the fourth source of pollution for human beings, the deteriorating electromagnetic environment not only causes harm to people's daily communications, computers, transportation and other electronic systems, but also poses a threat to people's health. In terms of military affairs, radar is still the most important and reliable equipment for detecting ...

Claims

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Application Information

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IPC IPC(8): C08L91/06C09D5/32C09D191/06C08K9/06H05K9/00C08L33/12C08L79/02
Inventor 熊国宣邓敏徐玲玲陆春华邓雪萍曾东海
Owner EAST CHINA UNIV OF TECH
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