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Composite electromagnetic shielding material and method for manufacturing same

A shielding material and composite electromagnetic technology, which is applied in the field of electromagnetic pollution prevention and microwave anechoic chambers, can solve the problems of difficult uniform dispersion, high cost and low output of carbon nanomaterials, and achieve the effects of easy dispersion, high production efficiency and large electrical loss.

Inactive Publication Date: 2013-02-06
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are two serious problems in the practical application of carbon nanotubes or nanofibers. One is that carbon nanotubes or nanofibers are difficult to disperse uniformly in the matrix due to their high aspect ratio and large surface area; The cost of these carbon nanomaterials is high and the output is low

Method used

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  • Composite electromagnetic shielding material and method for manufacturing same
  • Composite electromagnetic shielding material and method for manufacturing same
  • Composite electromagnetic shielding material and method for manufacturing same

Examples

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Effect test

Embodiment 1

[0038] A composite electromagnetic shielding material, which is composed of carbonized bacterial cellulose and matrix material paraffin;

[0039] The preparation method of the composite electromagnetic shielding material comprises the following steps:

[0040] a. Bacterial cellulose is obtained by static shallow plate culture, which is the same as the prior art;

[0041] b. Carbonized bacterial cellulose: the process parameters are: the carbonization temperature of bacterial cellulose is 800-1600 ℃, the background vacuum pressure is 10 -2 ~10 4 Pa, the holding time is 0.5 h ~ 4 h;

[0042] C, get the paraffin wax with the equal volume of carbonized bacterial cellulose;

[0043] d. Mix carbonized bacterial cellulose and paraffin wax at a volume ratio of 1:1, heat the mixture to 90 ℃ ~ 92 ℃, stir mechanically for 30 ~ 50 minutes, and then ultrasonically mix in a water bath at 85 ℃ ~ 90 ℃ for 20 ~ 50 minutes After cooling.

Embodiment 2

[0045] A composite electromagnetic shielding material, which is composed of carbonized bacterial cellulose and epoxy resin as a matrix material;

[0046] The preparation method of the composite electromagnetic shielding material comprises the following steps:

[0047] a. Bacterial cellulose is obtained by static shallow plate culture, which is the same as the prior art;

[0048] b. Carbonized bacterial cellulose: the process parameters are: the carbonization temperature of bacterial cellulose is 800-1600 ℃, the background vacuum pressure is 10 -2 ~10 4 Pa, the holding time is 0.5 h ~ 4 h;

[0049] C, get the epoxy resin of equal volume with the carbonized bacterial cellulose;

[0050] d. Mix the carbonized bacterial cellulose and epoxy resin at a volume ratio of 1:1, stir the mixture mechanically for 30-50 minutes, and let it stand for 1 day to naturally cure.

Embodiment 3

[0052] A carbonized bacterial cellulose electromagnetic shielding material, which is composed of a carbonized bacterial cellulose and a matrix material silicon dioxide;

[0053] The preparation method of the carbonized bacterial cellulose electromagnetic shielding material comprises the following steps:

[0054] a. Bacterial cellulose is obtained by static shallow plate culture, which is the same as the prior art;

[0055] b. Carbonized bacterial cellulose: the process parameters are: the carbonization temperature of bacterial cellulose is 800-1600 ℃, the background vacuum pressure is 10 -2 ~10 4 Pa, the holding time is 0.5 h ~ 4 h;

[0056] c, get silicon dioxide equal to the volume of carbonized bacterial cellulose;

[0057] d. Mix the carbonized bacterial cellulose and silicon dioxide at a volume ratio of 1:1, stir the mixture mechanically for 60 minutes and then solidify.

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Abstract

The invention discloses a composite electromagnetic shielding material. The composite electromagnetic shielding material is characterized in that carbonized bacterial celluloses and a nanometer magnetic metal material are mixed to form the composite electromagnetic shielding material; or carbonized bacterial celluloses and a matrix material are mixed to form the composite electromagnetic shielding material; or carbonized bacterial celluloses and a nanometer magnetic metal material are mixed to form a mixture, and then the mixture and a matrix material are mixed to form the composite electromagnetic shielding material; the nanometer magnetic metal material is an optional one of Fe, Ni, Co, NiFe and CoFe; and the matrix material is an optional one of paraffin, epoxy resin and silicon dioxide. A method for manufacturing the composite electromagnetic shielding material includes steps of manufacturing bacterial celluloses; manufacturing the carbonized bacterial celluloses; and manufacturing the composite electromagnetic shielding material, and the like. The composite electromagnetic shielding material is thin, light, wide and strong, has the advantages of low cost, simplicity in manufacturing process, environmental protection and the like, and has wide application prospects in fields of electromagnetic pollution prevention, microwave dark chambers, high-frequency electronic products and the like.

Description

technical field [0001] The invention belongs to an electromagnetic shielding material and a preparation method thereof, and relates to a composite electromagnetic shielding material and a preparation method thereof. The composite electromagnetic shielding material of the invention is especially suitable for the fields of anti-electromagnetic pollution, microwave anechoic chamber and the like. Background technique [0002] With the development of science and technology, various high-frequency electromagnetic wave devices and instruments such as radars, satellites, microwave ovens, and mobile cordless phones are widely used, making the earth space full of electromagnetic waves of various frequency bands. These electromagnetic waves will affect other electromagnetic instruments. While causing interference, it also affects human health. According to reports, working in front of a computer for more than 6 hours a day will cause irreversible damage to human skin due to electromag...

Claims

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Application Information

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IPC IPC(8): H05K9/00
Inventor 代波任勇王改花马拥军裴重华
Owner SOUTHWEAT UNIV OF SCI & TECH
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