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Polyethylene composite film for shielding wideband electromagnetic wave and its preparing method

A polyethylene, electromagnetic wave technology, applied in shielding, magnetic/electric field shielding, electrical components and other directions, can solve the problem of inability to shield electromagnetic waves, achieve good electromagnetic wave shielding performance, widen the shielding range, and improve the effect of shielding effectiveness

Inactive Publication Date: 2007-11-14
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the disadvantage that polyethylene cannot shield electromagnetic waves, the invention uses magnetic electromagnetic wave shielding additives to add polyethylene resin to make a base film to make it absorb low-frequency electromagnetic waves; and coats a metal layer on the surface of the base film to make it Can reflect electromagnetic waves in higher frequency bands

Method used

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  • Polyethylene composite film for shielding wideband electromagnetic wave and its preparing method
  • Polyethylene composite film for shielding wideband electromagnetic wave and its preparing method
  • Polyethylene composite film for shielding wideband electromagnetic wave and its preparing method

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Embodiment Construction

[0032] Below in conjunction with embodiment, further illustrate the present invention.

[0033] raw material:

[0034] polyethylene : Low-density polyethylene (LDPE), provided by the chemical plant of Beijing Yanshan Petrochemical Company, brand AC-100, density 0.9225g / cm 3 , Melt flow rate 2.0g / 10min, granular.

[0035] antioxidant : A mixture of tetrakis[β-(3',5'-di-tert-butyl-4'-hydroxyphenyl)propionate]pentaerythritol ester and dilauryl thiodipropionate in a weight ratio of 1:1, Beijing Orsay Ling Ke Trading Co., Ltd. for sale.

[0036] stainless steel long fiber : The fiber diameter is about 6.5 μm, the relative electrical conductivity is 0.1, and the relative magnetic permeability is ≥1000, provided by Hunan Huitong New Material Co., Ltd.

[0037] polycrystalline iron fiber : Provided by Jiangyou Hebao Nano Material Co., Ltd., short black fiber, with a diameter range of 6.5-9 μm, a length range of 0.5-2 mm, a relative conductivity of 0.17, and a relative magnet...

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Abstract

The composite membrane of polythene (CMP) includes basal body membrane (BBM) and surface coating for BBM. BBM is polyvinyl resin membrane of containing additive for shielding electromagnetic wave. The weight of additive is 10-100 weight portions if the said polyvinyl resin is in 100 weight portions. The additive includes two kinds: (1) one is admixture of metal fibers and metal conduction powder; the metal fibers are admixtures of polycrystal iron fiber and stainless steel fiber; the metal conduction powders include nickel powder, copper powder, iron powder, or aluminum powder; (2) the other is admixture of metal fibers and carbon fibers; the metal fibers are polycrystal iron fiber or stainless steel fiber; carbon fibers are nicarbazin fiber or nickel plated graphite fiber. Surface coating of BBM is metallic coating with average thickness being as 1-20 micros. CMP provides effect for shielding electromagnetic wave reaching about 45dB in range 50MHz-20GHz.

Description

technical field [0001] The present invention relates to a polyethylene resin film, more particularly, relates to a polyethylene film capable of shielding broadband electromagnetic waves and a preparation method thereof. Background technique: [0002] In a society with rapid development of electronics, electrical, communication and information industries, electromagnetic wave interference, electromagnetic wave information leakage and electromagnetic wave environmental pollution have become increasingly serious social problems. Electromagnetic wave is a transmission process of electromagnetic energy, which is a transverse wave, and its propagation form is similar to that of light. According to Schelkunoff's electromagnetic shielding theory, the shielding attenuation of electromagnetic wave energy has three forms: reflection loss, absorption loss and internal reflection loss. In general, it is mainly affected by reflection loss and absorption loss. Electromagnetic protection m...

Claims

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Application Information

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IPC IPC(8): H05K9/00G12B17/02C23C30/00C08L23/06C08K7/02
Inventor 焦清介臧充光解娜刘帅高宏梁礼孩
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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