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Cement radical composite wave-suction material and preparation method thereof

A composite wave-absorbing material and wave-absorbing material technology, which is applied in the cross field of material structure and combination, can solve the problems of narrow absorption frequency band, low absorption effect, high price, etc., to reduce the specific gravity, enhance stability and durability, and simplify the process Effect

Inactive Publication Date: 2007-09-26
DALIAN UNIV OF TECH
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] In order to overcome the shortcomings of the existing cement-based wave-absorbing materials such as narrow effective absorption frequency band, low absorption effect, large specificity, and high price, the present invention provides a preparation method for filling cement-based wave-absorbing materials with hollow wave-transmitting spheres. , such as EPS (expanded polystyrene), perlite foamed glass, quartz powder or other organic and inorganic materials with low dielectric constant, can effectively solve the above disadvantages

Method used

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Embodiment Construction

[0019] The preparation method of the present invention is described in detail below in conjunction with specific embodiments:

[0020] Option One

[0021] 1. Selection and pretreatment of wave-transparent spheres

[0022] 1 Selection of transparent ball

[0023] Particle size (mm)

Density (g / cm 3 )

1～2

3～4

5～6

0.02～0.03

0.012～0.018

0.005～0.01

[0024] 2 preprocessing

[0025] Rinse the foam ball with 5-10% hydrochloric acid and sodium hydroxide aqueous solution in sequence, and soak in 20-fold diluted acetone aqueous solution for 3 minutes to remove acidic and alkaline impurities and oil stains on the surface of the ball. Then take the polymer binder PVA and dilute it with water to a mass ratio of 2%, stir evenly, put it into a 4% silane coupling agent solution and stir for 10-20 minutes, take it out and dry it at room temperature for later use.

[0026] Preparation of the second absorber

[0027] 1 Preparation of conducti...

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Abstract

The invention relates to a cement base composite wave-adsorption material and relative preparation, belonging to the cross technique field between materials science and microwave technique. The invention is characterized in that the invention uses organic and inorganic hollow wave-transmission balls with low dielectric constant to fill a cement base to improve the resistance match of the base, and coat an uniform conductive coat on the surface of the wave-transmission balls, and stuffs wave absorber or the like to improve the adsorption of base on electromagnetic wave. The inventive wave-adsorption material is in single-layer or dual-layer structure, while the match layer and adsorption layer of dual-layer structure are respectively stuffed with wave-transmission balls or wave absorber in different ratios to gradually change the resistance, and the two layers are combined tightly to improve the wave adsorption. The invention has the advantages of that the improved resistance match and gradual structure can absorb electromagnetic wave in wide frequency range, the light wave-transmission balls can reduce the specific weight of material, and the wave-transmission balls are packed by cement slurry to improve the stability and durability of material.

Description

technical field [0001] The invention belongs to the cross-technical field of electromagnetic field and electromagnetic wave theory, material science, reflection, refraction (transmission) phenomenon derived from the interaction of electromagnetic field and material, and corresponding material structure and combination. The invention relates to a cement-based composite wave-absorbing material and a preparation method thereof, in particular to a method for preparing a cement-based wave-absorbing material by using a hollow wave-transmitting sphere. Background technique [0002] Cement-based absorbing material is a structural functional material used on the surface of buildings. It not only has the advantages of light weight and high strength of composite materials, but also can effectively absorb incident electromagnetic waves. The existing research results at home and abroad are mainly to fill the cement matrix with wave-absorbing agents, such as metal powder, ferrite, fiber, ...

Claims

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Application Information

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IPC IPC(8): E04D13/00E04D13/16
Inventor 刘顺华管洪涛李宝毅段玉平杜纪柱
Owner DALIAN UNIV OF TECH
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