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Electromagnetic compatible wood based composite material for engineering and method preparing the same

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

Inactive Publication Date: 2009-01-07
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 for engineering and method preparing the same
  • Electromagnetic compatible wood based composite material for engineering and method preparing the same
  • Electromagnetic compatible wood based composite material for engineering and method preparing the same

Examples

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Effect test

Embodiment 1

[0028] Example 1: 10 μm thick copper foil is glued to 3mm thick medium density fiberboard, epoxy resin E-51 is used as adhesive, polyamide resin 650 is used as curing agent, the mass ratio of the two is 1:1, and the bonding pressure is 0.1 MPa, glue amount is 80g / m 2 , the hot-pressing temperature is 60° C., and the hot-pressing time is 5 min. 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 silicone rubber to 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 a...

Embodiment 2

[0029] Example 2: 10 μm thick copper foil is glued to 3mm thick medium density fiberboard, using epoxy resin E-51 as adhesive, polyamide resin 650 as curing agent, the mass ratio of the two is 1:1, and the bonding pressure is 0.5 MPa, glue amount is 100g / m 2 , the hot-pressing temperature is 60° C., and the hot-pressing time is 30 minutes. 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 silicone rubber to 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, polyamid...

Embodiment 3

[0030] Example 3: 20 μm thick copper foil is glued to 5mm thick medium density fiberboard, epoxy resin E-51 is used as adhesive, polyamide resin 650 is used as curing agent, the mass ratio of the two is 1:1, and the bonding pressure is 1MPa , glue amount is 200g / m 2 , the hot-pressing temperature is 60°C, and the hot-pressing 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 silicone rubber to 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, polyami...

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Abstract

The invention provides an engineering electromagnetic compatibility wood-based composite material and a preparation method, belonging to the field of environmental function material. The electromagnetic compatibility wood-based composite material is the electromagnetic protection material applied to the engineering and carries out the protection on the aspects of shielding and wave absorbing; on the shielding aspect, a type of copper foil or Zn-plated iron plate covered on wood surface is adopted; on the aspect of wave absorbing, mainly aiming at the frequency range of 1MHz to 1.5GHz, single-layer interference loss is adopted, silicon rubber is taken as the substrate, MnZn ferrite is taken as main absorbent, carbonyl iron powder magnetic wave-absorbent and graphite resistance-typed absorbent are mixed, and the electromagnetic parameter of the material is adjusted: within the frequency of 1MHz to 1.5GHz, the maximum reflectivity of a wave-absorbing sheet is -12.28, and the frequency range when the reflectivity rate is less than -5dB is 965MHz. Furthermore, a dual-layer flat plate wave-absorbing material is adopted: a SiC matching layer is used on the surface layer and the MnZn ferrite and carbonyl iron powder are respectively on the bottom layer so as to be used as absorbent; the maximum reflectivity within 1-1.5GHz is -24.85dB and the bandwidth under -10dB of reflectivity is 240MHz. The engineering electromagnetic compatibility wood-based composite material leads the shielding efficiency of the composite plate to achieve 70dB and has good shielding efficiency.

Description

technical field [0001] An electromagnetically compatible wood-based composite material for engineering and its preparation method. The wood-based composite material is an electromagnetic protection material for engineering applications. The technical field of functional composite wood-based panel 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, economy, resources and environment. New growth points and intersections continue to emerge and continue to extend to other related disciplines. In order to better realize the efficient use of wood, we must continue to provide Injecting new scienti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00B32B15/10B32B15/20B32B15/18B32B37/12B32B37/10B32B37/06C08L83/04
Inventor 王群郭红霞王俊玲李永卿王澈
Owner BEIJING UNIV OF TECH
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