Foaming type electromagnetic wave absorption composite material and preparation method thereof

Abstract

The invention discloses a foaming type electromagnetic wave absorption composite material and a preparation method thereof. The electromagnetic wave absorption composite material is prepared from 10 to 40 mass percent of an electromagnetic absorbent and 60 to 90 mass percent of a base material through a foaming process. Impedance matching between the base material and air is improved by uniform gaps formed by foaming, and a powder material with electromagnetic wave absorption function is uniformly diffused in the foaming process of the base and adsorbed on foam hole walls to form a dielectric loss and magnetic hysteresis loss electromagnetic wave absorption network, so that the electromagnetic waves entering the base are converted into heat energy and attenuated through motion such as reflection, refraction, vortex, resonance and the like. The foaming type electromagnetic wave absorption composite material is widely applied to the field of electromagnetic radiation, electromagnetic interference and electromagnetic information leakage prevention, suppression and absorption treatment.

Description

technical field [0001] The invention relates to the field of electromagnetic wave-absorbing composite materials, in particular to a foamed electromagnetic wave-absorbing composite material and a preparation method thereof. Background technique [0002] In the traditional sense, according to the structure of the absorbing material, it can be divided into coating-type absorbing materials, patch-type absorbing materials, absorbing polymers, and absorbing composite materials. According to the electromagnetic absorbing mechanism, absorbing materials are divided into magnetic loss absorbing materials, electric loss absorbing materials and double complex absorbing materials. In order to meet the requirements of low reflection, high absorption, and broadband absorption, absorbing materials are often designed as double-layer or multi-layer structures. When the impedance transformation layer formed by the electromagnetic loss type absorbing material has a lower dielectric constant, i...

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Problems solved by technology

However, due to the high density of electromagnetic loss absorbing materials, they are prone to sedimentation and agglomeration, and it is difficult to disperse them evenly in the matrix, which affects the absorption of electromagnetic waves.

The existing research results at home and abroad are mainly filled with polystyrene balls, ceramsite, perlite and electromagnetic absorber mixture in the matrix material to improve the impedance matching between the matrix material and the air, but due to the added electromagnetic absorber The specific gravity is relatively large, the dispersion is poor, it is difficult to disperse evenly into the matrix, and the pre-processing is complicated and the cost is high, which limits the popularization and application