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Wave type carbon felt electromagnetic shielding structural body and preparation method thereof

An electromagnetic shielding and wave-type technology, which is applied in the fields of magnetic field/electric field shielding, chemical instruments and methods, electrical components, etc., can solve the problems of limited electromagnetic wave scattering effect, limited absorption performance, small carbon felt, etc., achieving good application prospects and satisfying Shielding requirements, low density effect

Active Publication Date: 2019-01-25
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, the internal fiber spacing of carbon felt is small, and the scattering effect on electromagnetic waves is limited, thus limiting the further improvement of its absorption performance.

Method used

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  • Wave type carbon felt electromagnetic shielding structural body and preparation method thereof
  • Wave type carbon felt electromagnetic shielding structural body and preparation method thereof
  • Wave type carbon felt electromagnetic shielding structural body and preparation method thereof

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preparation example Construction

[0045] The invention provides a method for designing and preparing a corrugated carbon felt electromagnetic shielding structure. The structure is formed by combining multiple layers of corrugated carbon felt according to a certain angle and bonding with an adhesive.

[0046] In the present invention, the corrugated carbon felt electromagnetic shielding structure can be designed as attached figure 2 Multiple combination angles shown. in the attached figure 2 In, (a) 6 layers[0] 6 Schematic diagram of the structure of the wavy carbon felt assembly; (b) 6 layers [0 / 90] 3 Schematic diagram of the structure of the wavy carbon felt assembly; (c) 6 layers [0 / 45] 3 Schematic diagram of the structure of the wavy carbon felt assembly; (d) 8 layers [0 / ±45 / 90] 2 Structural diagram of the wavy carbon felt assembly: 1 is a single-layer wavy carbon felt with a stacking angle of 0°, 2 is a single-layer wavy carbon felt with a stacking angle of 90°, and 3 is a single-layer wavy carbon felt...

Embodiment 1

[0053] This embodiment adopts fiber length 6mm, weight per unit area 10g / m 2 The carbon felt is used as the functional body, epoxy resin is used as the matrix, and an electromagnetic shielding structure with a curvature radius of 4 mm of 5-layer unit wave carbon felt is prepared by molding method, and the laying angle is figure 2 [0] in (a) 6 . The adhesive is epoxy resin, and the release agent is simethicone.

[0054] Step 1: Preparation of resin curing agent

[0055] According to the mass ratio of epoxy resin: imidazole = 100:3, weigh the corresponding mass of epoxy resin and imidazole, mix the above two solutions of a certain mass at room temperature and keep stirring until the solution is homogeneous.

[0056] Step 2: Pretreatment of carbon felt and mold

[0057] According to attached image 3 Cut the carbon felt to the appropriate size for the flat-panel mold shown. Immerse the cut carbon felt in the prepared resin solution to ensure that the resin solution is evenl...

Embodiment 2

[0064] This embodiment adopts fiber length 8mm, weight per unit area 5g / m 2 The carbon felt is used as the functional body, polyethylene is used as the matrix, and an electromagnetic shielding structure with a radius of curvature of 6-layer unit wave carbon felt of 4 mm is prepared by using the pultrusion process, and the laying angle is figure 2 [0 / 90] in (c) 3 . The adhesive is polybutadiene.

[0065] Step 1: Pretreatment of carbon felt

[0066] The matrix resin uses polyvinyl chloride, and the carbon felt is covered with two layers of polyvinyl chloride film to form a sandwich structure as shown in the attached Figure 6 shown. Then put the wrapped carbon felt and resin film into the attached Figure 6 Carry out pre-curing roll pressing in the heating furnace shown in 3, and the pre-curing temperature is 140°C.

[0067] Step 2: Pultrusion molding of single-layer corrugated carbon felt

[0068]Put the pretreated carbon felt and resin film in the middle of the flat mol...

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Abstract

The invention discloses a wave type carbon felt electromagnetic shielding structural body and a preparation method thereof. The structural body is combined by adopting multi-layer wave type carbon felts according to certain angles. The multi-layer wave type carbon felts are adhesively connected by adopting adhesives, the wave type carbon felts adopt resin as base bodies, and carbon fiber felts arefunctional bodies. The electromagnetic shielding structural body has the large internal surface area, after electromagnetic waves transmit the surface layer carbon felts, the hook faces of the innerlayer carbon felts can perform repeated reflection, by mans of the multiple electromagnetic wave scattering effect of carbon fiber inside the carbon felts, and therefore the electromagnetic wave consumption and absorption of the carbon felt structural body are remarkably enhanced, the electromagnetic shielding effect is improved, the surface layer wave type carbon felt can remarkably lower the reflecting effect for emission electromagnetic waves, the influence of electromagnetic waves for peripherals and workers is lowered, and the invisibility effect can be achieved in some application fields.

Description

technical field [0001] The invention relates to the field of electromagnetic shielding, in particular to a design and preparation method of a wave-shaped chopped carbon fiber felt electromagnetic shielding structure. Background technique [0002] Electromagnetic radiation pollution is the fourth largest environmental pollution after air pollution, water pollution and noise pollution. With the rapid development of the modern electronics industry, various electronic devices are widely used in aerospace, military, medical, transportation and other fields. The internal electronic devices will radiate electromagnetic waves of a certain frequency and energy when they are running. The resulting electromagnetic radiation not only threatens the operation and information security of electronic equipment, but also causes harm to the physical and mental health of people in the radiation area. At the same time, external electromagnetic radiation can also interfere with the normal operati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B9/00B32B9/04B32B27/04B32B7/12B32B3/28B32B27/06B32B27/30B32B37/06B32B37/10H05K9/00B29C70/28B29C70/54
CPCB29C70/28B29C70/54B32B3/28B32B5/02B32B5/26B32B7/12B32B27/08B32B27/12B32B27/304B32B37/06B32B37/10B32B2250/05B32B2260/021B32B2260/046B32B2262/106B32B2307/212B32B2307/304B32B2607/00H05K9/0088
Inventor 顾轶卓梁吉勇李敏汪诗义王绍凯李艳霞张佐光
Owner BEIHANG UNIV
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