High-performance cement-based electromagnetic shielding composite material and preparation process thereof
A technology of electromagnetic shielding and composite materials, applied in the field of electromagnetic shielding, can solve the problems of narrow research frequency band, poor mechanical properties, unsatisfactory shielding effectiveness, etc., and achieve good shielding effectiveness and good basic performance
Inactive Publication Date: 2020-05-29
中国人民解放军海军勤务学院
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[0010] Aiming at the deficiencies in the narrow frequency band, unsatisfactory shielding effectiveness and poor mechanical properties of cement-based materials with single addition of functional media, the present invention proposes an electromagnetic shielding composite of functional mortar mixed with reduced iron powder combined with copper-nickel shielding fabric The material, through the material performance test, gives its optimal proportion form
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[0028] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0029] Combined with the strength grade of plastering mortar, the replacement amount of fly ash and reduced iron powder, the mix ratio of functional mortar was preliminarily determined, as shown in Table 1.
[0030] Table 1 Functional mortar mix ratio
[0031]
[0032]
[0033] The preparation of the protective material: firstly, according to the selected functional mortar mix ratio, weigh the required mass of each component; secondly, add each component material into the mixer in order to stir, first put the cement and reduced iron powder Put it into the mixer for slow dry mixing for 60s, then fast dry mixing for 60s to fully mix the cement and reduced iron powder; finally, ad...
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Abstract
The invention discloses a high-performance cement-based electromagnetic shielding composite material and a preparation process thereof. The high-performance cement-based shielding protective materialcomprises the following components in parts by weight: 450 kg / m<3> of 42.5 ordinary Portland cement, 1373-1498 kg / m<3> of medium river sand, 50kg / m<3> of fly ash, 100-400 kg / m<3> of secondary reducediron powder, 300 kg / m<3> of water and a copper-nickel polymerization shielding fabric. The copper-nickel polymerization shielding fabric takes polyester as a carrier and is formed by weaving a copperwire mesh and a nickel wire mesh in a mixed manner, the thickness of the copper-nickel polymerization shielding fabric is 0.5mm, and the shielding effectiveness of the copper-nickel polymerization shielding fabric reaches 70dB in a frequency band of 1MHz-10GHz. Compared with a common functional cement-based material, the composite material formed by combining the cement-based material with the shielding fabric is provided, and the shielding effectiveness in a wide frequency band is better.
Description
technical field [0001] The invention relates to the field of electromagnetic shielding, and more specifically relates to a shielding protection material for engineering electromagnetic shielding transformation. Background technique [0002] Electromagnetic shielding materials are mainly divided into metal-based materials, carbon-based materials, conductive fabrics and conductive coatings. In practical applications, they are usually compounded with other materials. When compounded with cement-based materials, according to the type of electromagnetic medium and According to different functions, functional cement-based materials can be divided into conductive phase aggregate cement-based materials, fiber cement-based materials and microwave-absorbing cement-based materials. Metal-based electromagnetic shielding fabric has good folding resistance and excellent low-frequency electromagnetic shielding performance, and can be compounded with cement-based materials to a certain exte...
Claims
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IPC IPC(8): C04B28/04
CPCC04B28/04C04B2111/00258C04B14/34C04B14/06C04B18/08C04B14/48
Inventor高屹黄静陆颖健
Owner中国人民解放军海军勤务学院