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Method for preparing electromagnetic shielding composite material

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

Inactive Publication Date: 2005-12-21
SHANGHAI JIAOTONG 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] Dry wood material-straw husks were selected as raw materials, treated at 250°C for 1 hour at a heating rate of 1°C / min under non-oxygen conditions, and then immersed in an aqueous solution of magnetic metal salt-nickel carbonate for 1 hour, then taken out and dried. The treated and dried straw husk powder is fully mixed with the modified resin-phenolic resin, and then pressed at 100°C and 10MPA pressure, and further heated to 250°C at a rate of 1°C / min in a non-oxygen inert atmosphere. Incubate for 1 hour for non-oxidative treatment. ABS resin with a thickness of 50um was sprayed on the sample after high temperature treatment, and the electromagnetic shielding composite material with a shielding effect of more than 50dB in the range of 150MHZ-1.5GHZ was prepared after curing at room temperature.

Embodiment 2

[0020] Dry wood material-grain bran was selected as raw material, treated at 650°C with a heating rate of 20°C / min under non-oxygen conditions for 8 hours, and then immersed in an aqueous solution of magnetic metal salt-ferric chloride for 24 hours, then taken out and dried. The treated and dried grain bran material powder is fully mixed with the modified resin-furan resin and then pressed at 350°C and 50MPA pressure, and further heated to 1500°C at a rate of 20°C / min in a non-oxygen inert atmosphere. , and kept for 6 hours for non-oxidative treatment. The acrylic resin was sprayed on the sample after high temperature treatment, the thickness was 1000um, and the electromagnetic shielding composite material with shielding effect above 65dB in the range of 150MHZ-1.5GHZ was prepared after curing at room temperature.

Embodiment 3

[0022] The dry wood material-sorghum shell was selected as the raw material, treated at 450°C for 3 hours at a heating rate of 1°C / min under non-oxygen conditions, and then immersed in an aqueous solution of magnetic metal salt-nickel nitrate for 12 hours, then taken out and dried. The treated and dried sorghum shell material powder is fully mixed with the modified resin-furfural resin, and then pressed at 250°C and 30MPA pressure, and further heated to 875°C at a rate of 10°C / min in a non-oxygen inert atmosphere. , and kept for 4 hours for non-oxidative treatment. The high temperature treated samples were sprayed with silicone resin with a thickness of 500um, and cured at room temperature to prepare electromagnetic shielding composite materials with a shielding effect of more than 60dB in the range of 150MHZ-1.5GHZ.

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Abstract

A preparation method of an electromagnetic shielding composite material, specifically as follows: 1) select a wooden material, and process it at a heating rate of 1-20°C / min under non-oxygen inert conditions and within a temperature range of 250°C-650°C 1- 8 hours; and the wooden material is pretreated by immersing in an aqueous solution of magnetic metal salt for 1-24 hours, then taken out and dried; 2) further controlling its size and shape, and fully mixing with the modified resin, at a certain temperature and pressure Carry out molding treatment, and control its porosity and pore distribution; 3) Further perform high-temperature treatment in a non-oxygen inert atmosphere and within the temperature range of 250-1500°C, the heating rate is 1-20°C / min, and the holding time is 1-6 4) Coating treatment with organic resin, controlling coating thickness, curing at room temperature. The invention has the characteristics of low cost, wide sources, low density, high electromagnetic shielding ability in the ultra-wide frequency range, and high electromagnetic wave absorption ability.

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, and belongs 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 are all emitting electromagnetic radiation of various energies, so electromagnetic interference is becoming more and more prominent, and has become a The main obstacle to the normal functioning of the system, and the pollution of electromagnetic waves to human work and living environment has become a serious social problem, threatening human health, and due to the leakage of electromagnetic wave radiation, it...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05K9/00
Inventor 范同祥张荻刘庆雷
Owner SHANGHAI JIAOTONG UNIV