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

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...

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

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