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Carbon nano-pipe composite coating layer type wave absorption material and its preparation method

A technology of nanotube composite and wave-absorbing materials, which is applied in the fields of composite wave-absorbing materials and their preparation, polymers containing carbon nanotubes and their coatings and their preparations, and can solve the problems of small wave-absorbing peaks and narrow frequencies. Achieve excellent conductivity and reduce volume resistance

Active Publication Date: 2005-08-10
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the wave absorbing peak is small and the frequency is narrow

Method used

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  • Carbon nano-pipe composite coating layer type wave absorption material and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 1% of multi-walled carbon nanotubes with an outer diameter of 2 to 30nm and a length of 1 to 20 μm after vacuum drying, and 99% of polypropylene, first into a high-speed mixer, and then extruded through a twin-screw extruder to prepare Thin slices whose length, width and height are respectively 18mm×18mm×2mm are produced. This material exhibits a peak at 17.03GHz with a reflectivity of -1.2dB. 1% granular zinc oxide with an average particle size of 5nm and 99% varnish are formulated into a paint, and then the paint is sprayed on the surface of the above materials with a thickness of 1 μm. After the material is coated, the shape of the absorbing curve of the material is basically unchanged, but the position of the peak changes, and a peak appears at 15.90GHz, and the reflectivity is -1.1dB.

Embodiment 2

[0025] After vacuum drying, 4% of multi-walled carbon nanotubes with an outer diameter of 2 to 30 nm and a length of 1 to 50 μm and 96% of phenolic resin are first added to a high-speed mixer, and then extruded through a twin-screw extruder to prepare Thin slices whose length, width and height are respectively 18mm×18mm×2mm are produced. This material exhibits a peak at 7.6GHz with a reflectivity of -17.6dB. 50% granular zinc oxide with an average particle size of 30nm and 50% epoxy resin are formulated into a coating, and then the coating is sprayed on the surface of the above-mentioned materials with a thickness of 2 μm. After the material is coated, the shape of the absorbing curve of the material is basically unchanged, but the position of the peak changes, and a peak appears at 6.5GHz, and the reflectivity is -14.6dB.

Embodiment 3

[0027] After vacuum drying, 10% of single-walled carbon nanotubes with an outer diameter of 1-20nm and a length of 1-100μm, and 90% of EPDM rubber, are first added to a high-speed mixer, and then extruded through a twin-screw extruder. out, the length, width and height of the flakes were 18mm×18mm×2mm, respectively. This material exhibits a peak at 16.5GHz with a reflectivity of -10.2dB. 50% of rod-shaped zinc oxide with an average particle size of 100nm and 50% of varnish are formulated into a coating, and then the coating is sprayed on the surface of the above-mentioned materials with a thickness of 50 μm. After the material is coated, the shape of the absorbing curve of the material is basically unchanged, but the position of the peak changes, and a peak appears at 15.5GHz, and the reflectivity is -9.1dB.

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Abstract

A coated layer type composite wave absorbing material containing carbon nanotubes is composed of the basic substrate consisting of the polymer chosen from rubber, resin and plastics and carbon nanotubes, and the coated layer consisting of paint and nano-zinc oxide. Its advantages are high effect to absorb radar waves and adjustable frequency range of wave-absorbing peak.

Description

technical field [0001] The invention relates to a composite wave-absorbing material and a preparation method thereof, in particular to a polymer containing carbon nanotubes and its coating (polymer containing nano zinc oxide) and a preparation method thereof. It belongs to the technical field of wave-absorbing materials. Background technique [0002] Absorbing material is a type of material that can absorb electromagnetic wave energy projected onto its surface and convert it into heat energy through material loss. In application, in addition to requiring the absorbing material to have a high absorption rate for electromagnetic waves in a wide frequency band, it is also required that the material has properties such as light weight, temperature resistance, moisture resistance, and corrosion resistance. Advanced wave-absorbing materials are the material basis of high-tech and sophisticated weapons, and are indispensable materials in the application of important military indus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K3/04C09D5/32C09D109/00C09D123/16C09D133/00C09D161/06C09D163/00C09D177/00
Inventor 魏飞范壮军罗国华张增富
Owner TSINGHUA UNIV
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