Insulating heat-conducting polymer composite material with frequency selective electromagnetic shielding and preparation method thereof

A frequency-selective, insulating and heat-conducting technology, used in chemical instruments and methods, synthetic resin layered products, lamination, etc. Electromagnetic shielding performance and thermal conductivity, the effect of excellent thermal conductivity

Active Publication Date: 2020-07-10
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN 108943921 A discloses a multi-layer insulating thermal interface material and its preparation method. By alternately distributing insulating and heat-conducting fillers filled with silicone rubber and conductive and heat-conducting fillers filled with silicone rubber, a material with 2 n (n≥1) layers of multilayer insulating thermal interface materials, although the material has high thermal conductivity, excellent electrical insulation and mechanical properties, but the material does not have selective electromagnetic shielding performance and requires more insulating and thermally conductive fillers In order to form a heat conduction path, it is difficult to play the role of efficient electromagnetic shielding, insulation and heat dissipation in applications such as high-power integrated circuits, 5G communications, high-power radars, and terahertz communications equipment.
At present, there is no report on polymer-based materials with selective electromagnetic shielding and insulation and heat conduction functions. significance

Method used

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  • Insulating heat-conducting polymer composite material with frequency selective electromagnetic shielding and preparation method thereof
  • Insulating heat-conducting polymer composite material with frequency selective electromagnetic shielding and preparation method thereof
  • Insulating heat-conducting polymer composite material with frequency selective electromagnetic shielding and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] In this example, an insulating and heat-conducting polyurethane composite material with frequency-selective electromagnetic shielding is prepared, and the schematic diagram of its preparation process is shown in figure 1 As shown, the steps are as follows:

[0042] (1) Preparation of conductive and thermally conductive sheets and insulating and thermally conductive sheets

[0043] ①Mix and knead 100 parts by mass of polyurethane and 5 parts by mass of multi-walled carbon nanotubes evenly to obtain a conductive and thermally conductive mixture. The conductive and thermally conductive mixture is hot-pressed into a sheet using a vacuum molding machine, and the temperature of the vacuum molding machine is controlled during hot-pressing. 180° C. and a pressure of 10 MPa to obtain a conductive and thermally conductive sheet layer with a thickness of 0.35 mm.

[0044] ② Stir and blend 100 parts by mass of granular polyurethane with a particle size of about 100 μm and 20 parts...

Embodiment 2

[0052] In this example, an insulating and heat-conducting polypropylene composite material with frequency-selective electromagnetic shielding is prepared, and the schematic diagram of its preparation process is shown in figure 1 As shown, the steps are as follows:

[0053] (1) Preparation of conductive and thermally conductive sheets and insulating and thermally conductive sheets

[0054] ①Mix and knead 100 parts by mass of polypropylene and 10 parts by mass of multi-walled carbon nanotubes evenly to obtain a conductive and thermally conductive mixture. The conductive and thermally conductive mixture is hot-pressed into a sheet using a vacuum molding machine, and the temperature of the vacuum molding machine is controlled during hot-pressing The temperature is 180°C, the pressure is 10MPa, and a conductive and thermally conductive sheet layer with a thickness of 0.35mm is obtained.

[0055] ② 100 parts by mass of granular polypropylene with a particle size of about 100 μm and...

Embodiment 3

[0062] In this example, an insulating and heat-conducting polyhexamethylene adipamide composite material with frequency-selective electromagnetic shielding is prepared, and the schematic diagram of the preparation process is shown in figure 1 As shown, the steps are as follows:

[0063] (1) Preparation of conductive and thermally conductive sheets and insulating and thermally conductive sheets

[0064] ① Mix and knead 100 parts by mass of polyhexamethylene adipamide and 50 parts by mass of carbon black evenly to obtain a conductive and thermally conductive mixture. The conductive and thermally conductive mixture is hot-pressed into a sheet using a vacuum molding machine, and the vacuum molding machine is controlled during hot-pressing. The temperature is 235°C and the pressure is 10MPa to obtain a conductive and thermally conductive sheet layer with a thickness of 40mm.

[0065] ② Stir and blend 100 parts by mass of polyhexamethylene adipamide with a particle size of about 50...

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Abstract

The invention provides an insulating heat-conducting polymer composite material with frequency selective electromagnetic shielding, the material comprises an insulating heat-conducting layer and two conductive heat-conducting layers, and the two conductive heat-conducting layers are respectively located at two sides of the insulating heat-conducting layer to form an integrated sandwich structure;the insulating heat-conducting layer comprises a polymer matrix and an insulating heat-conducting filler, the insulating heat-conducting filler is selectively distributed at the interface of polymer particles to form an insulating heat-conducting network, each conductive heat-conducting layer comprises a polymer matrix and conductive heat-conducting filler, the conductive heat-conducting filler isdistributed in the polymer matrix to form a conductive heat-conducting network, and the polymer matrix of the insulating heat-conducting layer and the polymer matrix of the conductive heat-conductinglayers have the same composition; the material has frequency selective electromagnetic shielding performance and is insulated in the electromagnetic shielding direction. The frequency selective electromagnetic shielding function is given to an existing heat conduction electromagnetic shielding material, and the new requirements for selective electromagnetic shielding, heat conduction, insulationand the like of the heat conduction electromagnetic shielding material at present can be better met.

Description

technical field [0001] The invention belongs to the field of heat-conducting electromagnetic shielding materials, and relates to an insulating and heat-conducting polymer composite material with frequency-selective electromagnetic shielding and a preparation method thereof. Background technique [0002] The breakthrough of 5G communication technology and the expansion of application scenarios will promote the revolutionary development of communication equipment and smart terminals. Miniaturization, high frequency and high power have made the problems of electromagnetic interference and local heat generation increasingly prominent. Electromagnetic radiation not only affects the normal operation of electronic equipment, but also causes damage to the natural ecological environment, which poses hidden dangers to human health, and may also cause electromagnetic pollution and electromagnetic wave leakage. At the same time, the high integration and high power of electronic devices...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B25/08B32B25/18B32B25/20B32B27/06B32B27/08B32B27/20B32B27/32B32B27/34B32B27/40B32B33/00B32B25/02B32B27/04B32B37/02B32B37/06B32B37/10C08L75/04C08K3/04C08K3/38C08L23/12C08L77/06C08K3/34C08K3/06C08L7/00C08K3/22C08L9/00C08K3/14C08L83/04C08K5/14
CPCB32B25/08B32B25/18B32B25/20B32B27/06B32B27/08B32B27/20B32B27/32B32B27/34B32B27/40B32B33/00B32B37/02B32B37/06B32B37/10B32B2250/24B32B2250/40B32B2260/025B32B2260/046B32B2260/048B32B2307/202B32B2307/206B32B2307/212B32B2307/302C08K3/04C08K3/06C08K3/14C08K3/22C08K3/34C08K3/38C08K5/14C08K2003/2296C08K2003/385C08K2201/001C08K2201/003C08K2201/011C08K3/041C08K3/042C08L75/04C08L23/12C08L77/06C08L7/00C08L9/00C08L83/04
Inventor 廖霞王圭郭富民陈佳李光宪
Owner SICHUAN UNIV
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