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Properties of Polyurethane Foam-based Wave Absorbing Materials

Author:admin   AddTime:2021-06-04

1. Absorbing performance. The absorbing performance is the most important performance of the absorbing material. The absorbing frequency bandwidth of the polyurethane foam-based absorbing material has good absorbing effect. It has good absorbing performance in the wide frequency range of 300MH2~18GH2. Although the classification and numbering methods of absorbing materials produced by different manufacturers are different, the absorbing performance of commonly used wedge-shaped absorbing materials is mainly related to the height of the product. The higher the wedge, the better the absorbing performance. The ratio of the height l of the wedge to the wavelength λ of the incident wave must be greater than 1, so that the wedge can effectively absorb electromagnetic waves, and the larger the value of 1/, the better the wave-absorbing performance of the wedge. According to the relationship between wavelength and frequency ∫ λ=c/f (c is the speed of light in vacuum, c=3×108m/s), when f=500MHz, A=0.6m, that is, the height of the wedge must be equal to or greater than 600mm At this time, it can play a better absorbing effect in the 500MHz and higher frequency bands. Table 3-8 lists the properties of the 4 types of wedge absorbing materials with the closest wedge heights produced by different manufacturers. It can be seen from Table 3-8 that the performance of domestic absorbing materials is equivalent to that of Antic Company of the United States. Among them, the WXA type rigid polyurethane foam-based absorbing material produced by Luoyang Ship Material Research Institute has the most outstanding absorbing effect in high frequency bands. .



2. Physical properties. The requirements for the physical properties of the absorbing materials mainly refer to the strength requirements. In addition, the absorbing materials are also required to not deform or drop powder during use, and their performance is stable for a long time. In terms of strength, the rigid polyurethane foam-based absorbing material obviously has the advantage, so the rigid polyurethane foam-based absorbing material can be used as an ideal structural absorbing material. Because the rigid polyurethane foam-based absorbing material can be fixed by mechanical methods during installation, without bonding construction, it avoids the harmful gas released by the adhesive, which harms the body of the staff and damages the equipment.
3. Flame retardant performance. When designing a non-echo anechoic chamber, the requirements for the flame retardancy of the absorbing material are very strict. Polyurethane foam is extremely plastic due to its properties, so adding flame retardants or introducing flame retardant groups into its molecular structure are both effective methods to improve its flame retardant properties. Luoyang Shipbuilding Materials Research Institute adopted the method of combining the introduction of flame-retardant groups and the addition of flame retardants, and developed a rigid polyurethane foam-based wave absorbing material with excellent flame-retardant properties, which can self-extinguish immediately after leaving the fire. , And no spontaneous combustion and black smoke, its limiting oxygen index, conductivity combustion test, flame combustion test and flame-retardant test results meet the requirements of relevant standards.
4. Processing performance. For polyurethane foam-based absorbing materials, the enhanced reactive injection molding technology (RRIM) can be used to achieve continuous production, which not only ensures the strength and performance stability of the material, but also can be processed into non-coated shapes and different specifications according to user needs. Absorbing materials, such as wedge shape, pyramid shape, cone shape, arc shape and flat shape, etc.

Absorbing Material:https://www.goodsmaterial.com/

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