Wave-absorbing weaving piece of compound bar with carbon filaments arranged in buckling and extending manner and preparation method thereof

A technology of braided sheet and arrangement, which is applied in the direction of braid, textile and paper making, etc., to achieve the effect of superior electromagnetic shielding effect, simple preparation method, and convenient and quick preparation.

Inactive Publication Date: 2012-04-18
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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  • Wave-absorbing weaving piece of compound bar with carbon filaments arranged in buckling and extending manner and preparation method thereof
  • Wave-absorbing weaving piece of compound bar with carbon filaments arranged in buckling and extending manner and preparation method thereof
  • Wave-absorbing weaving piece of compound bar with carbon filaments arranged in buckling and extending manner and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0037] (2) The preparation of the composite sheet with buckling arrangement of carbon filament bundles: the carbon filament bundles are sewn into the polymer foam sheet at equal intervals along the plane direction of the foam sheet in the form of buckling waves, or in the After turning 90o or θ angle, in the same way, the carbon filament bundles are sewn into the foam sheet one by one in the plane direction of the foam sheet in the form of buckling waves, and are equally spaced, so that they are parallel, orthogonal or oblique. The buckling-arranged composite sheets are preferably parallel or orthogonal buckled-arranged composite sheets; preferably, the spacing between buckled-arranged carbon filament bundles in different directions is consistent. The buckling waveform is similar to a sine wave, and the wavelength is the needle distance; the bundle distance is the distance between the used carbon filament bundles. Needle pitch: beam spacing is (1~20):(10~1), needle pitch: beam...

Embodiment 1~7

[0041] Examples 1-7 Microwave-absorbing woven sheet and its preparation and electromagnetic shielding performance

[0042] Preparation of long and narrow strips of carbon fiber filament bundles buckled composite sheet: Cut the purchased polymer foam sheet into a size of 30cm×30cm, take a certain needle pitch as λ; the bundle spacing is half wavelength or 1 / 4 wavelength, That is d = λ / 2 or λ / 4mm. A special steel wire needle is used to shuttle the carbon fiber filaments back and forth in the high polymer foam sheet up and down to form a buckling wave shape until all the carbon fiber filaments are passed through, and a composite with parallel buckling arrangement is obtained. piece. Or after turning 90o or θ angle, in the same way, the carbon fiber filament bundles are sewed into the foam sheet one by one along the plane direction of the foam sheet in the form of buckling waves and at equal intervals in the same way. Orthogonal or oblique buckling arranged composite sheet. The...

Embodiment 1

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

[0047] Take a number of long strips of composite sheets arranged in parallel buckling with a beam spacing of 5mm and a stitch distance of λ=4d=20mm. Based on the warp and weft, according to a certain rule, the strips of the composite sheet are continuously picked up (the weft is above the warp) and pressed down (the weft is below the warp) to form a piece of plain weave with a size of 30cm×30cm, and the carbon fiber filament bundles are parallel Buckling arrangement of composite strips absorbing braided sheets.

[0048] Such as Figure 4 Shown is the microwave-absorbing efficiency-frequency curve of the parallel buckling-arranged composite strip microwave-absorbing woven sheet obtained in Example 1. Compared with the absorbing efficiency of parallel buckling composite sheets with the same structural parameters and d...

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Abstract

The invention provides a wave-absorbing weaving piece of a compound bar with carbon filaments arranged in a buckling and extending manner and a preparation method thereof. The wave-absorbing weaving piece is characterized by comprising electromagnetic shielding strips which are woven together, wherein each electromagnetic shielding strip comprises a substrate and at least one of a carbon fibre endless tow existing in a buckling wave shape and a carbon fibre endless tow existing in an extending shape. The preparation method is characterized by comprising the following steps of: preparing an electromagnetic shielding piece; and cutting the electromagnetic shielding piece into long and narrow electromagnetic shielding strips, and weaving the electromagnetic shielding strips into the wave-absorbing weaving piece. The wave-absorbing weaving piece combines the wave-absorbing advantages of a buckling and extending array and the wave-absorbing advantages of a weaving structure periodic array secondary dot matrix, the wave-absorbing weaving piece is convenient and efficient to prepare, and a high electromagnetic shielding effect at the frequency of 0.02-2.0GHz is realized. The wave-absorbing weaving piece can be applicable to a lining material of electromagnetic shielding protective clothing, a light structure building material and an interior material of a vehicle.

Description

technical field [0001] The invention relates to a wave-absorbing braided sheet made of carbon filament buckling and straightening composite strips and a preparation method thereof, belonging to the technical field of electromagnetic wave shielding materials. Background technique [0002] The human body's protection against electromagnetic waves is the direct way of wearing protection, and the indirect way is the use of shielding materials that have a shielding effect on electromagnetic waves. As an electromagnetic shielding fabric, it is generally woven or blended with conductive fibers such as metal. Although carbon fiber is conductive, due to its brittleness, it is mostly made of loose fibers mixed into a network or directly mixed with polymers. For example, CN 1544723A 2003 of the patent Gao Jianzhong invented a wave-absorbing composite nanofiber material textile composition, which is made of 80%~96% polyacrylonitrile-based carbon and 4%~20% nano-silicon carbide, and add...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04C1/02D04C1/06
Inventor 于伟东吴瑜周胜于昊慧杜赵群
Owner DONGHUA UNIV
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