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Method for preparing electromagnetic shielding compound material

A technology of electromagnetic shielding materials and composite materials, applied in the direction of magnetic field/electric field shielding, electrical components, etc., can solve the problem of high cost, achieve the effect of light weight, low density, and prevent malfunction

Inactive Publication Date: 2004-03-24
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the use of graphite as raw material, the cost is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The dry woody material-straw husk was selected as the raw material, treated at 250°C for 1 hour at a heating rate of 1°C / min under non-oxygen conditions, and then immersed in the aqueous solution of magnetic metal salt-nickel carbonate for 1 hour, then taken out and dried. The treated and dried rice straw husk powder is fully mixed with the modified resin-phenolic resin, and then press-molded at 100°C and 10MPA pressure, and further heated to 250°C at a rate of 1°C / min under a non-oxygen inert atmosphere. Incubate for 1 hour for non-oxidative treatment. Spray ABS resin on the sample after high temperature treatment, with a thickness of 50um, and prepare an electromagnetic shielding composite material with a shielding effect of more than 50dB in the range of 150MHZ-1.5GHZ after curing at room temperature.

Embodiment 2

[0020] Select dry woody material-rice bran as raw material, treat it at 650°C for 8 hours at a heating rate of 20°C / min under non-oxygen conditions, then immerse it in the aqueous solution of magnetic metal salt-ferric chloride for 24 hours, then take it out and dry it. Fully mix the treated and dried bran material powder with the modified resin-furan resin, press it at 350°C and 50MPA pressure, and further raise the temperature to 1500°C at a rate of 20°C / min in a non-oxygen inert atmosphere , Insulated for 6 hours for non-oxidative treatment. Spray acrylic resin on the sample after high temperature treatment with a thickness of 1000um, and prepare an electromagnetic shielding composite material with a shielding effect of more than 65dB in the range of 150MHZ-1.5GHZ after curing at room temperature.

Embodiment 3

[0022] Select the dry woody material-sorghum shell as the raw material, treat it at 450°C for 3 hours at a heating rate of 1°C / min under non-oxygen conditions, and then immerse it in the aqueous solution of magnetic metal salt-nickel nitrate for 12 hours, then take it out and dry it. Fully mix the treated and dried sorghum shell material powder with the modified resin-furfural resin, press it at 250°C and 30MPA pressure, and further raise the temperature to 875°C at a rate of 10°C / min in a non-oxygen inert atmosphere , heat preservation for 4 hours for non-oxidative treatment. Spray organic silicone resin on the sample after high temperature treatment with a thickness of 500um, and prepare an electromagnetic shielding composite material with a shielding effect of more than 60dB in the range of 150MHZ-1.5GHZ after curing at room temperature.

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Abstract

A preparation method for an electromagnetic shielding compound material includes 1) selecting a wood material to be immersed for 1-24h in magnetic metal salt solution, then to be dried 2) further controlling its size and shape, fully mixing it with modified resin and forming it into formation under certain temperature and pressure controlling its pore space rate and distribution 3) high temperature processing it under 250í½1500deg.C and bright inert atmosphere, temperature rising speed: 1-20deg.C / m for 1-6h 4) coating process with organic material controlling the thickness and solidifying at room temperature.

Description

technical field [0001] The invention relates to a preparation method of a composite material, in particular to a preparation method of a light-weight high-efficiency electromagnetic shielding composite material with high absorption and low reflection electromagnetic wave capability, belonging to the field of composite materials. Background technique [0002] With the development of science and technology and the electronic industry, the application of various electronic instruments and equipment is also increasing day by day. These electronic instruments and equipment all emit electromagnetic radiation of various energies, so electromagnetic interference is becoming more and more prominent, and has become a problem for many equipment, The main obstacle to the normal functioning of the system, and the pollution of electromagnetic waves to the human working and living environment has become a serious social problem, threatening human health, and due to the leakage of electromag...

Claims

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Application Information

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IPC IPC(8): H05K9/00
Inventor 范同祥张荻刘庆雷
Owner SHANGHAI JIAO TONG UNIV
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