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Electromagnetic wave absorption materials

A technology for absorbing materials and electromagnetic waves, applied in electrical components, magnetic/electric field shielding, shielding, etc., can solve problems such as inability to apply electromagnetic wave range, time-consuming and labor-intensive problems

Inactive Publication Date: 2008-04-23
IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the shortcomings of the prior art that the molding method of electromagnetic wave absorbing materials is time-consuming and labor-intensive, and cannot be applied to the electromagnetic wave range (between 30 MHz and 1 GHz) of general household appliances, the present invention provides an electromagnetic wave absorbing material, including barium titanate powder ; carbon; and an insulating polymer; wherein the carbon and the barium titanate powder are uniformly dispersed in the insulating polymer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] After adding 10 parts by weight of barium titanate powder and 3 parts by weight of graphite powder to 100 parts by weight of PC / ABS and mixing, the mixture was poured into the feed tank of a twin-screw mixer, and the temperature was 200°C. Then add 1.5 parts by weight of coupling agent (Lica38), 2 parts by weight of dispersant (KD10), and 2.5 parts by weight of flow aid (magnesium stearate) in the compression section of the kneader at 220°C. Finally, 0.2 parts by weight of antioxidant (Irganox 1076 (Ao-3)) was added to the melting section of the kneader at 250°C. The above-mentioned composite material is cooled and pelletized in a water bath, and then injection-molded into a thin sheet (No. 1) with a thickness of 3 mm. Its electromagnetic wave absorption parameters are shown in Table 1. It can be clearly found that the absorption efficiency between 30MHz and 1GHz is greater than 10db, that is Absorb more than 90% of electromagnetic waves.

[0016] Table I

[0017] ...

Embodiment 2

[0019] 20 parts by weight of barium titanate powder and 7 parts by weight of graphite powder were added to 100 parts by weight of PC / ABS and mixed, and the mixture was poured into the feed tank of a twin-screw mixer at a temperature of 200°C. Then add 1.5 parts by weight of coupling agent (Lica38), 2 parts by weight of dispersant (KD10), and 2.5 parts by weight of flow aid (magnesium stearate) in the compression section of the kneader at 220°C. Finally, 0.2 parts by weight of antioxidant Irganox 1076 (Ao-3) was added to the melting section of the kneader at 250°C. The above-mentioned composite material is cooled and pelletized in a water bath, and then injection-molded into a thin sheet (No. 2) with a thickness of 3 mm. The electromagnetic wave absorption parameters are shown in Table 2. It can be clearly found that the absorption efficiency between 30MHz and 1GHz is greater than 10db, that is Absorb more than 90% of electromagnetic waves.

[0020] Table II

[0021]

Embodiment 3

[0023] After adding 10 parts by weight of barium titanate powder and 3 parts by weight of graphite fiber to 100 parts by weight of PC / ABS and mixing, the mixture was poured into the feeding trough of a twin-screw kneader at a temperature of 200°C. Then add 1.5 parts by weight of coupling agent (Lica38), 2 parts by weight of dispersant (KD10), and 2.5 parts by weight of flow aid (magnesium stearate) in the compression section of the kneader at 220°C. Finally, 0.2 parts by weight of antioxidant Irganox 1076 (Ao-3) was added to the melting section of the kneader at 250°C. The above-mentioned composite material was cooled and pelletized in a water bath, and then injection-molded into a thin sheet (No. 3) with a thickness of 3mm. More than 90% of electromagnetic waves.

[0024] Table three

[0025]

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Abstract

The electromagnetic-wave absorbing material is suitable to frequency between 30MHz to 1GHz. The invention adds carbon and barium titanate into insulated macromolecules. After mixing or pugging operations, the invention adds coupling agent, dispersing agent, or flow promotor into the admixture. Passing through jet molding procedure, the admixture can be matched to any complex exterior. Absorptivity of the admixture is 99.7% for 30MHz electromagnetic wave, and absorptivity is larger than 95% for 1GHz electromagnetic wave.

Description

technical field [0001] The present invention relates to a composite material, and more particularly, relates to the application of the material in electromagnetic wave absorption. Background technique [0002] In order to prevent the electromagnetic waves generated by general electrical appliances from affecting the human body, various electromagnetic wave shielding materials have been developed in the industry in recent years. U.S. Patent No. 5571991, No. 5714102, No. 5595689; German Patent No. 3248658; WO Patent Publication No. 98 / 05043, No. 96 / 28007; Japanese Patent Application No. Hei 05-306602, Zhao 58-236080 ; or patents such as European Patent No. 0218183, No. 0454311, and No. 0401141, which are added conductive materials such as stainless steel, copper, aluminum, nickel-plated carbon fibers, etc. in plastic materials, which are not only expensive but also easy to have floating fibers or polyester in injection molding. Fiber and other issues. [0003] U.S. Patent No...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00G12B17/02
Inventor 郑龙正姜达铭刘文亮
Owner IND TECH RES INST
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