Flame-retardant broadband high-power composite absorbing material

Abstract

The invention relates to a flame-resisting broadband high-power composite wave-absorbing material, comprising a shell and at least one core and characterized in that the shell is composed of a composite wave-absorbing flame-retardant base of flame-retardant layer / conductive film / flame-retardant layer; each core is filled with conductive flame-retardant polystyrene spherical particles; the bottom of every core is integrally attached to the inner bottom of the shell. Compared with procedures of conventional nonwoven-based flame-resisting wave-absorbing materials, preparation procedures of the flame-resisting broadband high-power composite wave-absorbing material herein are greatly decreased. All the base, shell and cores of the flame-resisting broadband high-power composite wave-absorbing material can be produced automatically in batch manner; the defect that nonwoven-based flame-resisting wave-absorbing materials are high in labor and time consumption is thoroughly overcome.

Description

technical field [0001] The invention relates to a flame-retardant broadband wave-absorbing material, which mainly relates to an important material used in a full anechoic chamber and a semi-anechoic chamber. The production efficiency of flame retardant wave-absorbing materials in molding and other processes is relatively low, and the labor cost is relatively high. Background technique [0002] Microwave absorbing materials have been commercially produced in the 1970s. In the 1990s, Dalian Dongxin, Nanjing Boping, and Dalian Zhongshan successively completed the industrialization of the production of wave-absorbing materials based on soft polyurethane foam. However, soft polyurethane foam absorbing materials also have disadvantages that are difficult to overcome: first, although polyurethane foam absorbing materials have been flame-retardantly treated, their composition makes it difficult for their oxygen index to exceed 40%. It only reaches the B2 level, and it is prone to f...

AI Technical Summary

Problems solved by technology

However, soft polyurethane foam absorbing materials also have disadvantages that are difficult to overcome: first, although polyurethane foam absorbing materials have been flame-retardantly treated, their composition makes it difficult for their oxygen index to exceed 40%. It only reaches B2 level, and it is prone to fire accidents in some extreme cases

Second, the power resistance performance of polyurethane absorbing materials does not exceed 1500W / m 2 , even if the pore diameter of the polyurethane substrate is enlarged to 5mm, its power resistance performance is only 3200W / m 2

Third, when the height of the polyurethane foam pyramid is high, due to its own weight, after a period of use, the pointed end of the material pyramid will bend, making the aesthetics of the darkroom worse and the overall performance of the darkroom lower.

In order to overcome the above shortcomings, domestic manufacturers Nanjing Luopu and Nanjing Boping have successively developed flame retardant absorbing materials such as CN16649860B, CN100511487C and CN103347379A, which all use non-woven fabrics as substrates, and coat flame retardants and absorbents on the substrate surface , and then press-cut, folded, and bonded to form a pyramidal non-woven flame-retardant wave-absorbing material, which solves the problems of polyurethane wave-absorbing materials such as elbows, powder falling, low flame retardancy, and high power resistance.

However, the above-mentioned non-woven fabric absorbing materials also have some shortcomings that are difficult to overcome.

Since the brushing, cutting, folding, and bonding of non-woven fabric-based wave-absorbing materials cannot be automated, the manual production of non-woven fabric-based wave-absorbing materials has many processes, and the wave-absorbing materials are all handmade, and their quality and shape are consistent. sex is often not guaranteed

As a result, it is difficult to complete and avoid gaps between the pyramid units in the material, and the production capacity has been constrained by the production personnel.

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