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Low-reflection and high-absorption electromagnetic shielding polymer composite material with gradient electric conduction-uniform heat conduction dual-functional network

An electromagnetic shielding and composite material technology, applied in shielding materials, magnetic field/electric field shielding, carbon compounds, etc., can solve the problems affecting the thermal conductivity of materials, low thermal conductivity, heat accumulation, etc., and achieve low reflection and high absorption while optimizing and thermally conducting. The effect of simultaneous optimization of performance and thermal conductivity

Active Publication Date: 2021-05-25
ZHONGBEI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the low thermal conductivity and rich phonon scattering interface of polymer-based electromagnetic shielding materials will greatly affect the thermal conductivity of the material, often causing heat to accumulate inside the material, affecting the normal use of the shielding material, and further affecting the protected equipment. normal operation and service life

Method used

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  • Low-reflection and high-absorption electromagnetic shielding polymer composite material with gradient electric conduction-uniform heat conduction dual-functional network
  • Low-reflection and high-absorption electromagnetic shielding polymer composite material with gradient electric conduction-uniform heat conduction dual-functional network
  • Low-reflection and high-absorption electromagnetic shielding polymer composite material with gradient electric conduction-uniform heat conduction dual-functional network

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A method for preparing a carbon nanotube-based electromagnetic shielding polymer composite material with a double-layer gradient conduction-uniform heat conduction dual-functional network, comprising the following steps:

[0031] Step 1, preparation of double-layer gradient conductive carbon nanotube foam, including:

[0032] Weigh 60mg of carbon nanotubes, and blend them with 0.69g of water-based polyurethane (solid content is 35wt%) in 15ml of deionized water, and ultrasonically disperse for 30min to prepare a CNT-20 dispersion; weigh 120mg of carbon nanotubes, mix with 0.51g of water-based Polyurethane was blended in 15ml of deionized water and ultrasonically dispersed for 30 minutes to prepare a CNT-40 dispersion; the two dispersions were poured into the mold in sequence, frozen and shaped in liquid nitrogen, and the interface was assisted by heat flow to make the cells connected , a double-layer gradient conductive carbon nanotube foam with a thickness of 4mm was o...

Embodiment 2

[0040] A method for preparing a carbon nanotube-based electromagnetic shielding polymer composite material with a three-layer gradient conduction-uniform heat conduction dual-functional network, comprising the following steps:

[0041] Step 1, preparation of three-layer gradient conductive carbon nanotube foam, including:

[0042] Weigh 40mg of carbon nanotubes, and blend them with 0.46g of water-based polyurethane (solid content is 35wt.%) in 10ml of deionized water, and ultrasonically disperse for 30min to prepare a CNT-20 mixed solution; weigh 60mg of carbon nanotubes, and mix with 0.4g Water-based polyurethane was blended in 10ml of deionized water, ultrasonically dispersed for 30min to prepare CNT-30 dispersion liquid; 80mg of carbon nanotubes were weighed, blended with 0.34g of aqueous polyurethane in 10ml of deionized water, and ultrasonically dispersed for 30min to prepare CNT-30 40 dispersion liquid; pour the three dispersion liquids into the mold in sequence, freeze ...

Embodiment 3

[0050] A method for preparing a carbon nanotube-based electromagnetic shielding polymer composite material with a three-layer gradient conduction-uniform heat conduction double network, comprising the following steps:

[0051] Step 1, preparation of three-layer gradient conductive carbon nanotube foam, including:

[0052] Weigh 40mg of carbon nanotubes, and blend them with 0.46g of water-based polyurethane (solid content is 35wt.%) in 10ml of deionized water, and ultrasonically disperse for 30min to prepare a CNT-20 mixed solution; weigh 60mg of carbon nanotubes, and mix with 0.4g Water-based polyurethane was blended in 10ml of deionized water, ultrasonically dispersed for 30min to prepare CNT-30 dispersion liquid; 80mg of carbon nanotubes were weighed, blended with 0.34g of aqueous polyurethane in 10ml of deionized water, and ultrasonically dispersed for 30min to prepare CNT-30 40 dispersion liquid; pour the three dispersion liquids into the mold in sequence, freeze and shape...

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Abstract

The invention belongs to the technical field of functional composite materials, and particularly relates to a low-reflection and high-absorption electromagnetic shielding polymer composite material with a gradient electric conduction-uniform heat conduction dual-function network structure and a preparation method of the low-reflection and high-absorption electromagnetic shielding polymer composite material. The composite material comprises a gradient conductive carbon nanotube network with a vertical orientation foam structure, and a uniformly heat-conducting hexagonal boron nitride / carbon nanotube functional network jointly constructed by a uniformly dispersed hexagonal boron nitride filler network constructed by blending and pouring processes in carbon nanotube foam and a gradient carbon nanotube network. Conductive carbon nanotube foam is successfully compounded with high-thermal-conductivity but insulating boron nitride, the low-reflection and high-absorption characteristics of the electromagnetic shielding composite material are realized through gradient prefabricated network structure control, and hexagonal boron nitride is directionally arranged under the effect of volume limitation by constructing an oriented foam structure prefabricated network, so that the optimal optimization of the heat-conducting property of the composite material is realized, and the goal of simultaneously optimizing the low-reflection and high-absorption properties and the heat-conducting property of the electromagnetic shielding composite material is finally realized.

Description

technical field [0001] The invention belongs to the technical field of functional polymer composite materials, and in particular relates to a gradient conduction-uniform heat conduction dual-function network low-reflection and high-absorption electromagnetic shielding polymer composite material. Background technique [0002] 5G mobile communication technology promotes the rapid development of the smart electronics industry, but at the same time, increasingly complex electromagnetic radiation has become one of the main factors affecting the accuracy of equipment and threatening human health. urgent need. The current study shows that high electrical conductivity and multi-interface structure control are the prerequisites for composite materials to obtain high shielding effectiveness. However, simply endowing materials with high conductivity is not a perfect solution for designing ideal shielding materials, because high conductivity often directly leads to a large amount of re...

Claims

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Application Information

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IPC IPC(8): C08L83/04C08L75/04C08K3/04C08K3/38
CPCC08L83/04C08K2201/011C08K2201/001C08K2003/385C08L75/04C08K3/041C08K3/38H05K9/009B82Y30/00C01B32/168B29K2075/00B29C39/006B29C39/42B29K2021/00B29K2083/00B29K2105/167B29K2995/0011B82Y40/00C08K9/00C08L83/06H05K9/0088
Inventor 刘亚青任威段宏基杨雅琪赵贵哲
Owner ZHONGBEI UNIV
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