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Electromagnetic compatible wood based composite material with shielding cloth covered on surface and preparation thereof

A technology of composite materials and compatible wood, which is applied in the field of electromagnetic protection materials preparation, can solve the problems of few researches on absorbing materials, achieve the effect of improving the secondary reflection problem, the preparation process is simple and easy, and the shielding efficiency is high

Inactive Publication Date: 2009-03-11
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are two types of electromagnetic wave absorbing materials for low frequency and high frequency. Carbonyl iron is mainly used for high frequency, and MgZn ferrite and MnZn ferrite are mainly used for low frequency. At present, there are many researches on absorbing materials in the high frequency range, and for There are few studies on absorbing materials with frequencies below 1.5GHz

Method used

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  • Electromagnetic compatible wood based composite material with shielding cloth covered on surface and preparation thereof
  • Electromagnetic compatible wood based composite material with shielding cloth covered on surface and preparation thereof
  • Electromagnetic compatible wood based composite material with shielding cloth covered on surface and preparation thereof

Examples

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Embodiment 1

[0028] Example 1: The nickel-plated shielding cloth with a thickness of 2 μm is glued to a medium-density fiberboard with a thickness of 3 mm, and polyvinyl acetate emulsion is used as an adhesive. At room temperature, the amount of glue applied is 50 g / m 2 , the pressure is 0.5MPa, and the pressurization time is 120min. The wave-absorbing plate is a single layer, the substrate is silicone rubber, and the curing agent is composed of a crosslinking agent and a catalyst. The crosslinking agent is tetraethyl orthosilicate, the catalyst is dibutyltin dilaurate, and the mass ratio of the silicone rubber to the curing agent is 95: 5. The mass fraction of silicone rubber and curing agent is 20%, the absorber is MnZn ferrite, the mass fraction is 80%, and the thickness of the wave-absorbing plate is 1mm. The wave-absorbing sheet is glued to the wood board, using epoxy resin E-51 as adhesive, polyamide resin 650 as curing agent, the mass ratio of epoxy resin to curing agent is 1:1, and...

Embodiment 2

[0029] Example 2: The nickel-plated shielding cloth with a thickness of 2 μm is glued to a medium-density fiberboard with a thickness of 3 mm, and polyvinyl acetate emulsion is used as an adhesive. At room temperature, the amount of glue applied is 50 g / m 2 , the pressure is 1MPa, and the pressurization time is 100min. The wave-absorbing plate is a single layer, the substrate is silicone rubber, and the curing agent is composed of a crosslinking agent and a catalyst. The crosslinking agent is tetraethyl orthosilicate, the catalyst is dibutyltin dilaurate, and the mass ratio of the silicone rubber to the curing agent is 95: 5. The mass fraction of silicone rubber and curing agent is 20%, the absorber is MnZn ferrite and carbonyl iron powder, the mass fraction of absorber is 80%, of which MnZn ferrite is 70%, carbonyl iron is 10%, The thickness of the absorber is 2mm. The wave-absorbing sheet is glued to the wood board, using epoxy resin E-51 as adhesive, polyamide resin 650 as...

Embodiment 3

[0030] Example 3: The nickel-plated shielding cloth with a thickness of 5 μm is glued to a medium-density fiberboard with a thickness of 5 mm, and polyvinyl acetate emulsion is used as an adhesive. 2 , the pressure is 2MPa, and the pressurization time is 60min. The wave-absorbing plate is a single layer, the substrate is silicone rubber, and the curing agent is composed of a crosslinking agent and a catalyst. The crosslinking agent is tetraethyl orthosilicate, the catalyst is dibutyltin dilaurate, and the mass ratio of the silicone rubber to the curing agent is 95: 5. The mass fraction of silicone rubber and curing agent is 20%, the absorber is MnZn ferrite and carbonyl iron powder, the mass fraction of absorber is 80%, of which MnZn ferrite is 50%, carbonyl iron is 30%, The thickness of the absorber is 3mm. The wave-absorbing sheet is glued to the wood board, using epoxy resin E-51 as adhesive, polyamide resin 650 as curing agent, the mass ratio of epoxy resin to curing agen...

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Abstract

The invention relates to a surface mount shielding cloth electromagnetic compatibility wood-based composite material and the preparation method thereof, belonging to the field of electromagnetic compatibility material. The surface mount shielding cloth electromagnetic compatibility wood-based composite material has electromagnetic shielding function and electromagnetic wave absorption function; the surface mount shielding cloth electromagnetic compatibility wood-based composite material fulfills the electromagnetic shielding function through surface mount nickelplated or copperplated shielding cloth and the electromagnetic wave absorption function through a surface mount wave absorption plate; the wave absorption plate is prepared with silicon rubber as a basal body and the filled ferrite, carbonyl iron, graphite and silicon carbide as absorbent, and then the absorbent is stuck to the wood; the electromagnetic compatibility wood-based composite material has shield effectiveness of around 60 dB, electromagnetic wave absorbency ranges from 1 MHz to 1.5 GHz with the minimum value of -24.85 and the reflectivity of 240 MHz with the bandwidth being less than -10 dB.

Description

technical field [0001] A surface-coated shielding cloth electromagnetically compatible wood-based composite material and a preparation method thereof. The wood-based composite material is an electromagnetic protection material that simultaneously realizes electromagnetic shielding and electromagnetic wave absorption functions, and involves a gluing process, selection of a wave absorber and a matrix The invention relates to the design of a wave-absorbing structure and belongs to the technical field of electromagnetic protection material preparation. Background technique [0002] Wood is the only renewable and naturally degradable biological resource among the four major materials (steel, cement, wood and plastic) in the world today, and as a material with superior performance, it is widely used in various fields such as construction, furniture, papermaking, transportation, etc. . The development of wood material research is closely related to the development of society, econ...

Claims

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Application Information

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IPC IPC(8): H05K9/00B27D1/04B32B21/10B32B15/14B32B37/12B32B37/10C08L83/04C08K5/541C08K3/22C08K3/14
Inventor 王群王俊玲李永卿郭红霞王澈
Owner BEIJING UNIV OF TECH
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