Electromagnetic wave absorbing concrete and preparation method thereof

A technology that absorbs electromagnetic waves, concrete, used in the field of building materials

Active Publication Date: 2015-05-27
福建省盛威建设发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, since it is difficult for a single material to meet the requirements of electromagnetic radiation protection, multiple materials must be compounded in various forms to obtain the best effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] First prepare nano-graphene oxide:

[0068] At 0-2°C, add 1 Kg of 200-mesh natural flake graphite into 20 L of concentrated sulfuric acid, stir for 3 hours, then add 0.6 Kg of sodium nitrate and 3.2 Kg of potassium permanganate, control the temperature at 1-3°C and stir 12 h; after heating up to 33-35°C and stirring for 3 h, slowly add 46 L of water under stirring, then raise the temperature to 93-95°C and continue stirring for 1 h; then, slowly add 70 L of water within 20 min, and then stir Slowly add 3 L of hydrogen peroxide within 1 h, and continue to stir for 5 h to obtain a suspension of bright yellow powder; filter out the bright yellow powder and wash it with water, then dry it in vacuum at 65°C for 24 h to obtain nanographene oxide.

[0069] Then prepare nano-LiFe 5 o 8 / Graphene oxide powder:

[0070] (1) Take 10.8Kg, 220 mesh Fe 2 o 3 , with 1Kg, 220 mesh Li 2 CO 3 Mix evenly, and then use a high-energy ball mill to mill the mixture for 170 h before u...

Embodiment 2

[0117] First prepare nano-graphene oxide, and its preparation steps are the same as in Example 1.

[0118] Then prepare nano-LiFe 5 o 8 / Graphene oxide powder:

[0119] (1) Take 28Kg, 220 mesh Fe 2 o 3 , with 2.6Kg, 220 mesh Li 2 CO 3 Mix evenly, and then use a high-energy ball mill to mill the mixture for 170 h before use.

[0120] (2) The ball-milled mixture in the above step (1) was treated in an air atmosphere at 650°C for 0.5 h, and then placed at room temperature for use.

[0121] (3) After mixing the powder prepared in the above step (2) with 1.04Kg graphene oxide evenly, use a high-energy ball mill to ball mill the mixture for 120 h to obtain nano-LiFe 5 o 8 / Graphene oxide powder 28.3Kg, of which LiFe 5 o 8 The average particle size is 45 nm.

[0122] Preparation of Nano-LiFe 5 o 8 / Graphene oxide polymethacrylic acid composite absorbing material:

[0123] (1) According to the amount of each component, that is, 1.5Kg nano LiFe 5 o 8 / graphene oxide p...

Embodiment 3

[0143] First prepare nano-graphene oxide, and its preparation steps are the same as in Example 1.

[0144] Then prepare nano-LiFe 5 o 8 / Graphene oxide powder:

[0145] (1) Take 22.2Kg, 220 mesh Fe 2 o 3 , with 1.9Kg, 220 mesh Li 2 CO 3 Mix evenly, and then use a high-energy ball mill to mill the mixture for 170 h before use.

[0146] (2) The ball-milled mixture in the above step (1) was treated in an air atmosphere at 650°C for 0.5 h, and then placed at room temperature for use.

[0147] (3) Mix the powder prepared in the above step (2) with 0.76Kg graphene oxide evenly, and use a high-energy ball mill to mill the mixture for 120 h to obtain nano-LiFe 5 o 8 / Graphene oxide powder 20.2Kg, of which LiFe 5 o 8 The average particle size is 50 nm.

[0148] Preparation of Nano-LiFe 5 o 8 / Graphene oxide polymethacrylic acid composite absorbing material:

[0149] (1) According to the amount of each component, that is, 12Kg nano LiFe 5 o 8 / graphene oxide powder, 80...

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Abstract

The invention relates to electromagnetic wave absorbing concrete and a preparation method of the concrete and belongs to the field of building materials. The concrete is prepared from a polymethylacrylic composite wave absorbing material containing nano LiFe5O8 / graphene oxide, a nano beta-MnO2 / graphene oxide composite wave absorbing material, water, cement, slag powder, coal ash, a water reducer, a fine aggregate and macadams by the steps of mixing, stirring and pouring. The concrete provided by the invention shows a good broadband microwave absorbing performance in a range of 2-18GHz, and the bandwidth of the concrete lower than -7dB is optimally 13.7GHz and the bandwidth of the concrete lower than -10dB is optimally 9.8GHz, so that the concrete can be applied to electromagnetic wave protection of critical buildings of military and administrative branches, functional building internally provided with a lot of precise electronic instruments, buildings adjacent to radar, microwave base stations, high power wireless communication transmitting stations and the like. The concrete provided by the invention is innovative, high in scientific content and broad in application prospect.

Description

technical field [0001] The invention relates to concrete with the function of absorbing electromagnetic waves and a preparation method of the concrete, belonging to the field of building materials. Background technique [0002] Absorbing concrete is a functional concrete that can absorb electromagnetic waves within a certain frequency range through energy attenuation, conversion, and dissipation. At present, with the rapid development of electronics, electrical, communication and information industries, electromagnetic wave interference, electromagnetic wave information leakage and electromagnetic environmental pollution caused by electromagnetic wave radiation are becoming more and more serious, becoming the fourth largest global pollution after water pollution, air pollution and noise pollution. environmental issues. All kinds of buildings, especially the key buildings of military and administrative departments closely related to national security, functional buildings wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B18/30C04B24/26C04B22/02C04B22/06C04B22/08
CPCY02W30/91
Inventor 欧国原欧清峰毛祥华蒋国平
Owner 福建省盛威建设发展有限公司
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