Lightweight and broadband wave absorbing material with foam sandwich structure and method for producing same

Abstract

The invention relates to a lightweight and broadband wave absorbing material with foam sandwich structure, comprising a panel 1, a sandwich layer 2 and a bottom plate 3. The panel 1 is a wave-transparent material layer; the sandwich layer 2 is wave absorbing resin foam; and the bottom plate 3 is an electromagnetic wave absorbing and reflecting layer. The method for producing the lightweight and broadband wave absorbing material with foam sandwich structure comprises the steps of mixing raw materials, foaming the mixed raw material, curing the mixed raw material to obtain monolayer foam wave absorbing materials and adhering the monolayer foam materials to form multi-layer foam wave absorbing material. The lightweight and broadband wave absorbing material with foam sandwich structure has good low-frequency performance, broad absorption band, light surface density, superior environmental performance and the like. The method is mature and stable, can be used for the large-scale continuous production and is easy to realize the industrialization.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and relates to a lightweight broadband electromagnetic wave structure absorbing material and a preparation technology. Background technique [0002] In recent years, with the increasing demand for military and civilian electromagnetic wave absorbing materials, various electromagnetic wave absorbing materials have been widely researched and prepared. The current absorbing materials are mainly ferrite, metal powder, polycrystalline / amorphous fibers. However, due to the lack of load-carrying capacity, high surface density, and poor weather resistance of coated wave-absorbing materials, its application prospects in some fields are limited, especially it is difficult to meet the requirements for the preparation of stealth aircraft. [0003] Compared with the radar absorbing coating developed earlier, the stealth composite material can provide electrical and aircraft structure designers wi...

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Problems solved by technology

Yu Mingxun et al. (Ding Wenhao, Yu Mingxun, et al. Research on the microwave-absorbing properties of polyurethane foams containing chopped conductive fibers[J]. Engineering Plastics Application, 2007, 35(11): 20-22; Song Yuhua, Yu Mingxun , et al. Research on radar-absorbing polyurethane foam [J]. Engineering Plastics Application, 2006, 34(16): 13-16) Adding conductive chopped fibers with electrical loss as the main factor to polyurethane to prepare wave-absorbing foam , has a good absorbing effect in the high-frequency band, but the effect in the low-frequency band is not good; Shen Guozhu et al. Science Edition), 2008, 36(3): 379-382) combined conductive chopped carbon fiber and ferrite material, added to polyurethane to prepare wave-absorbing foam, achieved both electrical loss and magnetic loss, and obtained Good wave-absorbing effect, but the addition of ferrite material has a large difference in density and polyurethane, which affects its process stability, and ordinary carbon fiber is a single electrical loss material, which is not conducive to widening the frequency band; Chen Liang et al. (Chen Liang, Deng Longjiang, et al. .A broadband multi-layer foam absorbing material and its preparation method. Chinese Patent: Patent Publication No.: CN1929731A) A soft polyurethane foam with an open-cell structure is prepared by absorbing and soaking carbon black and other materials, which can be used in the centimeter band Good wave-absorbing effect is achieved, but the mechanical properties of flexible polyurethane foam are low, and foam-structured wave-absorbing materials cannot be prepared

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