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Electromagnetic shielding sheet with flexural and unbent composite arrangement of carbon fiber endless tow and preparation thereof

An electromagnetic shielding and carbon fiber technology, applied in the field of electromagnetic shielding sheet and its preparation, achieves the effect of increasing electromagnetic shielding efficiency, wide range of uses and less material used

Inactive Publication Date: 2012-04-25
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although carbon fiber is conductive, but because of its brittleness, it is mostly made of loose fibers mixed into a network or directly mixed with polymers.

Method used

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  • Electromagnetic shielding sheet with flexural and unbent composite arrangement of carbon fiber endless tow and preparation thereof
  • Electromagnetic shielding sheet with flexural and unbent composite arrangement of carbon fiber endless tow and preparation thereof
  • Electromagnetic shielding sheet with flexural and unbent composite arrangement of carbon fiber endless tow and preparation thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0038](3) Preparation of composite carbon filament bundles in parallel arrangement: on the buckling arrangement composite sheet, the carbon filament bundles are laid on the composite sheet in parallel or at right angles to the buckling arrangement direction at a certain interval. One side of the sheet, and then pressed into the surface layer of the polymer foam sheet with a pressure cylinder, to obtain a composite sheet with one side parallel to or perpendicular to the buckling arrangement. If it is not arranged in the form of orthogonal squares or oblique diamonds, or not laminated, the straight carbon filament bundles that have been laid in parallel and pressed in are sealed by glue coating or filming, and a single Electromagnetic shielding sheets are arranged parallel to the same direction or parallel to orthogonal buckling on one side of the layer.

[0039] (4) Preparation of composite carbon filament bundles in an orthogonal or diamond-shaped straight arrangement: the car...

Embodiment 1-4

[0045] Embodiment 1-4: single-layer single-sided electromagnetic shielding sheet and its preparation and its electromagnetic shielding performance:

[0046] The raw materials used are commercially available polyacrylonitrile (PAN)-based carbon fiber filament bundle, 200tex / 3000F; PVC foam sheet, silicone rubber.

[0047] Carbon fiber filament bundle buckling arrangement composite sheet preparation: cut the purchased PVC foam sheet into a size of 30cm′30cm, and take a certain pitch of lambda ; Beam spacing; half wavelength or 1 / 4 wavelength, ie d = lambda / 2 or lambda / 4mm. A special steel wire needle is used to shuttle the carbon fiber filament bundles up and down in the PVC foam sheet to form a buckling wave shape until all the carbon fiber filament bundles are passed through, and a composite sheet in parallel buckling arrangement is produced. Or turn the sheet by 90o, and in the same way, the carbon fiber filament bundles are sewn into the foam sheet bundle by bund...

Embodiment 1

[0049] The beam-taking distance is 5mm, and the needle pitch is lambda =4 d = 20 mm of a composite sheet arranged in parallel buckling, on one side of which the carbon fiber filament bundles are stretched and perpendicularly laid, and several carbon fiber filament bundles are cut off, each of which is 35 cm long. In the warp direction of the composite sheet, lay them straight and parallel at intervals of 10 mm and press them in with pressure rollers; then lay carbon fiber filament bundles at the same interval in the weft direction to form a composite sheet with an orthogonal square grid. Cut off the excess carbon fiber filament bundle, and seal the surface with a PVC film with a width greater than 30cm. That is, the single-sided square grid parallel buckling arrangement electromagnetic shielding sheet is obtained, such as figure 1 as shown in c.

[0050] Such as Figure 4 shown, for figure 1 The EMSE (Electro-Magnetic Shielding Efficiency) curve of the electromagnetic sh...

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Abstract

The invention relates to an electromagnetic shielding sheet with flexural and unbent composite arrangement of carbon fiber endless tows and preparation thereof. The electromagnetic shielding sheet comprises at least one layer of electromagnetic shielding sheet and is characterized by further comprising a high-polymer foamed sheet, wherein a plurality of carbon fiber endless tows of a flexural wave state penetrate in the high-polymer foamed sheet, and a plurality of unbent carbon fiber endless tows are embedded in the single side or double sides of the high-polymer foamed sheet. According to the invention, a special arrangement manner of the carbon fiber endless tows is adopted and can make up for the defect of poor effect on shielding certain frequency bands by the carbon fiber endless tows of the flexural wave state and the unbent carbon fiber endless tows, so that a broadband electromagnetic shielding effect is achieved, and besides, the integral electromagnetic shielding effectiveness can be increased.

Description

technical field [0001] The invention relates to an electromagnetic shielding sheet compounded by buckling and straightening of carbon fiber filament bundles and its preparation, belonging to the technical field of electromagnetic wave shielding materials. Background technique [0002] With the emergence and application of high-tech products, the electromagnetic radiation pollution it produces is the fourth largest environmental pollution after water pollution, air pollution and noise pollution. Electromagnetic radiation can affect people's physiological habits and health. Long-term exposure to electromagnetic radiation can also cause damage to the nervous system, cardiovascular system, endocrine system, reproductive system, and immune system. In order to reduce the harm of electromagnetic radiation to the human body, people should take protection against electromagnetic radiation. [0003] Wearing protection is the most direct and effective protection. As an electromagneti...

Claims

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Application Information

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IPC IPC(8): H05K9/00
Inventor 于伟东吴瑜周胜杜赵群邓成亮陈毅
Owner DONGHUA UNIV
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