Coating type wave-absorbing aramid paper, wave-absorbing honeycomb and preparation method

Abstract

The invention discloses coating type wave-absorbing aramid paper, a wave-absorbing honeycomb and a preparation method, and belongs to the technical field of functional materials, the coating type wave-absorbing aramid paper comprises aramid paper and a wave-absorbing layer coated on the surface of the aramid paper, the components of the wave-absorbing layer comprise an absorbent and a resin system, the thickness of the wave-absorbing layer is 0.02-0.1 mm, and the volume ratio of the absorbent to the resin system is 1: 1-1: 5. The coating type wave-absorbing aramid paper not only has high electromagnetic loss, stable electromagnetic parameters and large electromagnetic parameter regulation range, but also has good mechanical properties.

Description

technical field [0001] The invention relates to a coated wave-absorbing aramid paper, a wave-absorbing honeycomb and a preparation method, belonging to the technical field of functional materials. Background technique [0002] Aramid paper honeycomb is a new type of lightweight structural sandwich material, which has the advantages of low density, high mechanical properties, and good heat resistance, and is mainly used in lightweight sandwich structures. Aramid paper honeycomb has excellent electromagnetic wave transmission performance, but does not have electromagnetic wave absorption performance, so it cannot be directly used in the field of wave absorption. Through physical or chemical methods, the aramid paper honeycomb is modified to obtain the aramid wave-absorbing honeycomb, which is applied in a lightweight sandwich structure and can meet the needs of structure / wave-absorbing integration. [0003] Based on the above background, if the aramid paper wave-absorbing hon...

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Problems solved by technology

[0004] Invention patent CN1570271A discloses a kind of magnetic fiber aramid fiber synthetic paper and its wet papermaking method. The synthetic paper is composed of aramid fiber, magnetic fiber and bonding fiber, and has been treated with surface sizing. The synthetic paper is not suitable for making Absorbing honeycomb, the reason is that the synthetic paper adds polyester fiber or polyphenylene sulfide fiber with a lower melting point as the bonding fiber, which is easy to shrink and deform after hot pressing, resulting in poor high-temperature dimensional stability of the honeycomb based on the synthetic paper. The surface of the synthetic paper is treated with sizing, and its permeability to the resin is reduced, resulting in poor mechanical properties of the honeycomb made based on the synthetic paper

Invention patent application CN110258172A discloses a high-performance magnetic fiber / meta-aramid fiber fibrid paper-based composite material and its preparation method. The paper-based composite material is composed of aramid fibrid fiber and magnetic fiber. The paper-based composite material It is also not suitable for making wave-absorbing honeycomb, because the paper-based composite material does not contain aramid chopped fibers, and its mechanical properties are low, resulting in poor mechanical properties of the honeycomb based on the paper-based composite material

Both the synthetic paper disclosed in CN1570271A and the paper-based composite material disclosed in CN110258172A are not for wave-absorbing applications, so they do not disclose how to select the length and amount of magnetic fibers according to the wavelength of electromagnetic waves to be absorbed, and cannot be directly used for wave-absorbing aramid paper honeycomb production

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