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

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

Active Publication Date: 2021-06-08
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 and heat-conducting polymer composite with frequency-selective electromagnetic shielding and preparation method thereof
  • Insulating and heat-conducting polymer composite with frequency-selective electromagnetic shielding and preparation method thereof
  • Insulating and heat-conducting polymer composite 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 thermally conductive polyurethane composite material with frequency selective electromagnetic shielding is prepared. The schematic diagram of the preparation process is as follows: figure 1 shown, the steps are as follows:

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

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

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

Embodiment 2

[0052] In this embodiment, an insulating and thermally conductive polypropylene composite material with frequency selective electromagnetic shielding is prepared. The schematic diagram of the preparation process is as follows: figure 1 shown, the steps are as follows:

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

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

[0055] ② 100 parts by mass of polypropylene with a particle size ...

Embodiment 3

[0062] In this embodiment, an insulating and thermally conductive polyhexamethylene adipamide composite material with frequency selective electromagnetic shielding is prepared. The schematic diagram of the preparation process is as follows: figure 1 shown, the steps are as follows:

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

[0064] 1. Mix and knead 100 parts by mass of polyhexamethylene adipamide and 50 parts by mass of carbon black to obtain a conductive and thermally conductive mixture. The conductive and thermally conductive mixture is hot-pressed into a sheet shape using a vacuum molding machine, and the vacuum molding machine is controlled during hot-pressing molding. 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] ② 100 parts by mass of polyhexamethylene adipamide powder with a particle...

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Abstract

The invention provides an insulating and heat-conducting polymer composite material with frequency-selective electromagnetic shielding. The material is composed of one insulating and heat-conducting layer and two electrically-conducting and heat-conducting layers. The sandwich structure; the insulating and heat-conducting layer contains a polymer matrix and insulating and heat-conducting fillers, and the insulating and heat-conducting fillers are selectively distributed at the polymer particle interface to form an insulating and heat-conducting network. The filler is distributed in the polymer matrix to form a conductive and heat-conducting network, and the composition of the insulating and heat-conducting layer is the same as that of the polymer matrix of the conductive and heat-conducting layer; the material has frequency-selective electromagnetic shielding performance and is insulated in the direction of electromagnetic shielding. The invention endows the existing heat-conducting electromagnetic shielding material with a frequency-selective electromagnetic shielding function, and can better meet the current new requirements for the heat-conducting electromagnetic shielding material in terms of selective electromagnetic shielding, heat conduction and insulation.

Description

technical field [0001] The invention belongs to the field of thermal conductive electromagnetic shielding materials, and relates to an insulating thermal conductive 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 make the problems of electromagnetic interference and local heat release more and more prominent. Electromagnetic radiation not only affects the normal operation of electronic equipment, but also damages the natural ecological environment, posing 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 make the heat diss...

Claims

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Application Information

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Patent Type & Authority Patents(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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