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Electromagnetic wave absorbing plate and preparation method thereof

A technology for absorbing plates and electromagnetic waves, applied in chemical instruments and methods, electrical components, magnetic field/electric field shielding, etc., can solve the problems of limitation and increase in thickness, and achieve the effect of low thickness, reduced material thickness, and good absorption of electromagnetic wave radiation

Inactive Publication Date: 2016-01-27
HAINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the indoor electromagnetic radiation protection materials in buildings are mixed with cementitious materials and other specific radiation protection materials, but the above-mentioned schemes have the problem of increasing the thickness when improving the electromagnetic wave performance. 10db absorption, the thickness often needs to reach more than 2cm, and this thickness limits its large application

Method used

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  • Electromagnetic wave absorbing plate and preparation method thereof

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preparation example Construction

[0062] The invention provides a method for preparing an electromagnetic wave absorbing plate, comprising:

[0063] Coating the first paper film and the second paper film on the gypsum composite layer to obtain the first paper film layer and the second paper film layer;

[0064] Printing the conductive paint onto the first paper film layer to obtain the resistive mesh layer;

[0065] coating the protective film on the resistive mesh layer to obtain the protective film layer;

[0066] Coating the conductive film on the second paper film layer to obtain the conductive film layer.

[0067] In the present invention, the components and structures of the above layers have been clearly described above, and will not be repeated here.

[0068] The preparation method of the electromagnetic wave absorbing board provided by the present invention first coats the first paper film and the second paper film on the gypsum composite layer to obtain the first paper film layer and the second pap...

Embodiment 1

[0086] 100 parts by weight of gypsum, 6 parts by weight of binder polyvinyl alcohol, 6 parts by weight of white cement, 2 parts by weight of glass fiber, 0.1 part by weight of carbon fiber, 15 parts by weight of dolomite powder, 1 part by weight of conductive carbon black, 8 parts by weight of talcum powder , 4 parts by weight of starch, 0.1 part by weight of methylcellulose, and 50 parts by weight of water. Mix the above raw materials evenly, stir them evenly with a mortar mixer to obtain a mixed slurry, pour it into a mold and cast it into a plate, the thickness is controlled at 1.1cm, and after the plate is solidified, it is demoulded and dried to obtain a gypsum composite board.

[0087] Cover the upper and lower sides of the gypsum board with kraft paper to prepare a paper-faced gypsum board;

[0088] The screen-printed grid-shaped resistive resonant film is used on the paper-faced gypsum board. The parameters are: the width of the grid is 26mm, the spacing is 26mm, and t...

Embodiment 2

[0092] 100 parts of gypsum, 8 parts of polyvinyl alcohol as binder, 7 parts of white cement, 3 parts of glass fiber, 0.2 parts of carbon fiber, 16 parts of dolomite powder, 2 parts of conductive carbon black, 9 parts of talcum powder, 5 parts of starch, methyl cellulose 0.2 parts, 50 parts of water. Mix the above raw materials evenly, stir them evenly with a mortar mixer to obtain a mixed slurry, pour it into a mold and cast it into a plate, the thickness is controlled at 1.1cm, and after the plate is solidified, it is demoulded and dried to obtain a gypsum composite board.

[0093] Cover the upper and lower sides of the gypsum board with kraft paper to prepare a paper-faced gypsum board;

[0094] The screen-printed grid-shaped resistive resonant film is used on the paper-faced gypsum board, and the parameters are: grid width 26mm, spacing 26mm, film square resistance 380Ω / □;

[0095] The lower side is covered with aluminum foil film, and the upper side is covered with PVC fi...

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Abstract

The invention provides an electromagnetic wave absorbing plate, comprising a gypsum composite layer; a first paper film layer and a second paper film layer respectively arranged at two sides of the gypsum composite layer; a resistor net film layer arranged on the first paper film layer, wherein the resistor net film layer is made of conductive coatings; a protection film layer arranged on the resistor net film layer; and a conductive film layer arranged on the second paper film layer. The electromagnetic wave absorbing plate comprises the gypsum composite layer, the first paper film layer, the second paper film layer, the resistor net film layer, the protection film layer and the conductive film layer. An electromagnetic wave is incident on the surface of the absorbing plate, then enters inside of the absorbing plate through the resistor net film layer and reaches the conductive film layer at the bottom, and is repeatedly reflected and refracted by the conductive film layer and the resistor net film layer. The phase mutual interference and phase resonance of electromagnetic waves due to incidence, reflection and refraction will lead to the loss of electromagnetic energy so that good electromagnetic wave radiation absorbing effect is achieved. Furthermore, by choosing the mentioned film layers, the thickness of material is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to an electromagnetic wave absorbing board and a preparation method thereof. Background technique [0002] With the rapid development of the information society, electronic products are becoming more and more popular. While electronic products bring great convenience to people, they also bring certain harm. In particular, the widespread use of electronic devices with built-in information processing devices, and the increasing speed of CPU calculations have resulted in more and more high-frequency electromagnetic wave radiation and noise pollution. The deteriorating electromagnetic environment not only affects the communication, computer, and signal propagation of various electronic systems that human life increasingly relies on, causing malfunctions of system devices and unpredictable disasters, but also poses a threat to human health. Studies have shown that working, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00B32B13/08B32B29/00B32B9/00B32B15/12B32B37/02
Inventor 郝万军郁信丹夏兰何楠陈伟鹏
Owner HAINAN UNIVERSITY
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