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Electromagnetic shielding macromolecule composite material

A polymer material, electromagnetic shielding technology, applied in the fields of magnetic field/electric field shielding, electrical components, layered products, etc., can solve the problems of electromagnetic shielding plastic or coating cost increase, not easy to disperse, easy to settle the filler, etc., to achieve electromagnetic shielding The effect of high efficiency, light weight and large absorption loss

Inactive Publication Date: 2007-10-10
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, metal fillers are mainly used in actual production, including silver, copper, nickel and other metal powders, as well as metal fibers. These fillers have different characteristics, but they all have a common disadvantage-heavy specificity. Therefore, fillers in It is easy to settle in the resin and not easy to disperse, which limits its use
Another disadvantage is that it must be added in large quantities to have better electromagnetic shielding performance, which greatly increases the cost of electromagnetic shielding plastics or coatings

Method used

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  • Electromagnetic shielding macromolecule composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Nickel foam is used. The surface density of nickel foam is 320g / m2, the thickness is 1.6mm, and the pore diameter is 110ppi; the metal foam has a metallic luster in appearance, connected pores, a porosity of more than 95%, and a three-dimensional network structure. Figure 1 is a scanning electron micrograph of the surface morphology of foam metal nickel.

[0022] Using one-component acrylic resin + 6% ferrite, fully diluted, soak nickel foam, apply ultrasonic vibration to the outside, take it out after 1 minute, blow off the excess paint in the hole with high-pressure air, only leave a gap on the nickel skeleton Afterwards, according to China Aerospace Industry Corporation's aerospace industry industry standard "QJ2809-96 Test Method for Shielding Effectiveness of Planar Materials", the porous electromagnetic shielding sheet was tested for electromagnetic shielding effectiveness by point frequency method, and the frequency range was 100kKHz -1GHz, the material has an av...

Embodiment 2

[0023] Embodiment 2 Molding method prepares foamed copper / ABS resin electromagnetic shielding plastic

[0024] The main raw materials required: copper foam is used as filler, the specification is 200×200×1.8, the surface density is 350g / m2, the pore diameter is 90PPI, and the thermoplastic resin ABS is selected as the matrix material. Preparation process:

[0025] First mix ABS resin and pigment evenly, spread it on the bottom of the flat mold, then spread the resin-treated foamed copper with a certain strength, then add resin to fill the mold, and heat-press at a temperature of 300°C. The resulting product has a specification of 200×200×2.5.

[0026] The mechanical properties and electromagnetic shielding properties of the obtained electromagnetic shielding plastic were carried out.

[0027] In the electromagnetic shielding plastic, since the metal network of the nickel foam is not damaged, the copper foam is sandwiched in the middle of the ABS resin matrix material to form...

Embodiment 3

[0028] Embodiment 3 injection method prepares foam metal nickel powder / PE resin electromagnetic shielding plastic

[0029] The main raw material needed: nickel foam, crush it into 50-500μm powder with a pulverizer, and use thermoplastic resin polyethylene (PE).

[0030] Preparation process:

[0031] 60wt% PE resin, 30wt% foam metal nickel powder treated with coupling agent, 5wt% pigment and 5% Fe 3 o 4 (Ferrite) powder is mixed evenly, passed through the injection machine, and injection molded at a temperature of 200°C.

[0032]Because the foam metal nickel powder has a porosity of more than 95% and a three-dimensional network structure, the pulverized foam metal nickel powder has a dendritic structure and is uniformly dispersed in the polyethylene resin (PE) matrix to form a conductive network. The low density and light weight of nickel powder has little effect on the density and mechanical properties of polyethylene resin (PE).

[0033] The electromagnetic shielding effe...

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Abstract

This invention discloses electromagnetic shielding polymer composite sheets or rolls. The polymer composite is composed of foam metal with pore diameters of 60-6000 mu.m, porosity above 75% and density of 0.03-1.2 g / cm3, and polymer material such as thermoplastic resin, thermosetting resin or rubber. The polymer composite has such advantages as high electromagnetic shielding performance and low cost, and can be used in aviation, aerospace, security communication, electronics, electrics and electrical devices.

Description

Technical field: [0001] The invention relates to an electromagnetic shielding material, and in particular provides a novel electromagnetic shielding material compounded by metal foam and polymer materials. Background technique: [0002] With the development of science and technology, there are more and more electrical and electronic equipment used in production and life. These equipment often generate some useful or useless electromagnetic waves while they are running. On the one hand, these electromagnetic waves will affect the normal use of other equipment or systems; on the other hand, the leakage of these electromagnetic waves will cause information leakage. The leakage of electromagnetic information is related to the security of the country, economy and military. In addition, electromagnetic waves can also cause harm to the health of the human body and organisms. [0003] Electromagnetic interference (EMI) has become a social public hazard. In order to prevent interfe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18B29C70/88B32B15/08H05K9/00
CPCF16J15/064F16J15/121
Inventor 李洪锡
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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