CN111806011A - Electromagnetic wave-absorbing material with oblique incidence performance improvement - Google Patents

Electromagnetic wave-absorbing material with oblique incidence performance improvement Download PDF

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Publication number
CN111806011A
CN111806011A CN202010702687.9A CN202010702687A CN111806011A CN 111806011 A CN111806011 A CN 111806011A CN 202010702687 A CN202010702687 A CN 202010702687A CN 111806011 A CN111806011 A CN 111806011A
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absorbing material
wave
magnetic wave
electromagnetic wave
oblique incidence
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CN202010702687.9A
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Chinese (zh)
Inventor
李坚强
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Heai Emc Technology Anhui Co ltd
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Heai Emc Technology Anhui Co ltd
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    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/085—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/092—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising epoxy resins
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    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
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    • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
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    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
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    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/212—Electromagnetic interference shielding
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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    • C08L2205/00—Polymer mixtures characterised by other features
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  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

The invention discloses an electromagnetic wave-absorbing material with improved oblique incidence performance, which comprises a metal bottom plate and at least two magnetic wave-absorbing material layers arranged on the metal bottom plate, wherein the density of the magnetic wave-absorbing material layers is gradually increased from a position far away from the metal bottom plate layer to a position close to the metal bottom plate layer, and a plurality of resonance conducting strips are respectively and uniformly distributed in each magnetic wave-absorbing material layer; the electromagnetic wave-absorbing material with the improved oblique incidence performance changes the incidence angle of electromagnetic waves by using the magnetic wave-absorbing material layers with different densities, so that the electromagnetic waves are refracted and reflected for multiple times in the wave-absorbing material, and the wave-absorbing capacity is improved.

Description

Electromagnetic wave-absorbing material with oblique incidence performance improvement
Technical Field
The invention belongs to the field of materials with special functions, and particularly relates to an electromagnetic wave absorbing material with an improved oblique incidence performance.
Background
In the prior art, on one hand, with the development of communication and electronic technology, electromagnetic waves with different frequencies fill the lives of people, destroy the living environment of people and cause serious electromagnetic pollution; on the other hand, the electromagnetic wave absorbing material is also one of important stealth materials, and can absorb radar waves, so that reflected waves are weakened or even not reflected, and the purpose of stealth is achieved. Therefore, electromagnetic wave-absorbing materials are receiving more and more attention. Among a plurality of electromagnetic wave-absorbing materials, the structural electromagnetic wave-absorbing material is more and more widely applied.
The electromagnetic wave-absorbing structure is a composite material, has the advantages of strong pertinence, good wave-absorbing performance, light weight, mechanical property meeting the bearing requirement and the like, and becomes an important development aspect of the modern stealth technology. The electromagnetic wave-absorbing structure not only has good wave-absorbing performance in a wider frequency band, but also has hot points of high temperature resistance, light weight, humidity resistance, corrosion resistance and the like. With the improvement of the performance of the detection system, the requirement on the stealth performance is higher, and correspondingly, the higher performance requirement is provided for the electromagnetic wave-absorbing structure. However, most of the existing electromagnetic wave-absorbing structures only consider the wave-absorbing performance under vertical incidence, and the research on the wave-absorbing performance of the electromagnetic wave-absorbing structures under oblique incidence is little. Therefore, the research on the oblique incidence performance of the electromagnetic wave-absorbing structure with multiple comprehensive structural forms is an urgent technical problem to be solved.
Disclosure of Invention
The invention aims to provide an electromagnetic wave-absorbing material with improved oblique incidence performance, which changes the incidence angle of electromagnetic waves by using magnetic wave-absorbing material layers with different densities, so that the electromagnetic waves are refracted and reflected for multiple times in the wave-absorbing material, and the wave-absorbing capacity is improved.
The electromagnetic wave-absorbing material with the improved oblique incidence performance comprises a metal base plate and at least two magnetic wave-absorbing material layers arranged on the metal base plate, wherein the density of the magnetic wave-absorbing material layers is gradually increased from a position far away from the metal base plate layer to a position close to the metal base plate layer, and a plurality of resonance conducting strips are respectively and uniformly distributed in each magnetic wave-absorbing material layer.
Preferably, the resonance conducting strips are all parallel to the metal bottom plate.
Preferably, the thickness of the magnetic wave-absorbing material layer is 1.5-2.5 mm, the thickness of the resonance conducting strip is 0.5-0.8 mm, and the resonance conducting strip is arranged at the center of the magnetic wave-absorbing material layer.
Preferably, the magnetic wave-absorbing material layer is provided with at least three layers.
Preferably, the magnetic wave-absorbing material layer is prepared from the following raw materials: 90-95% of light carrier material and 5-10% of magnetic wave-absorbing material.
Preferably, the light carrier material comprises 25-45% of epoxy resin, 45-50% of polyethylene foam, 1-2% of dispersant polyethylene glycol, 3-4% of flame retardant pentaerythritol, 1-2% of thickener hydroxyethyl cellulose and 1-2% of initiator ammonium persulfate.
Preferably, the magnetic wave-absorbing material comprises 80-95% of hydroxyl iron powder and 5-20% of conductive agent carbon black.
The electromagnetic wave-absorbing material with the improved oblique incidence performance has the following beneficial effects: the incident angle of the electromagnetic waves is changed by utilizing the magnetic wave-absorbing material layers with different densities, so that the electromagnetic waves are refracted and reflected for many times in the wave-absorbing material, and the wave-absorbing capacity is improved. Meanwhile, the plurality of magnetic wave-absorbing material layers with different densities refract the electromagnetic waves with larger incident angles to the maximum extent, the incident angle of the magnetic wave-absorbing material layer with different densities entering the next layer is reduced each time, the wave-absorbing capacity is improved, and the reflection of the electromagnetic waves is reduced.
Drawings
Fig. 1 is a sectional view of an electromagnetic wave-absorbing material with improved oblique incidence performance according to the technical scheme of the invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.
Referring to fig. 1, the electromagnetic wave-absorbing material with improved oblique incidence performance in the technical scheme of the invention comprises a metal bottom 1 and at least two magnetic wave-absorbing material layers 2 arranged on the metal bottom plate 1. The density of the magnetic wave-absorbing material layer 2 is gradually increased from a position far away from the metal bottom plate layer to a position close to the metal bottom plate layer, and a plurality of resonance conducting sheets 3 are uniformly distributed in each magnetic wave-absorbing material layer 2. The resonance conducting strips 3 are all parallel to the metal base plate 1.
In the technology, the thickness of the magnetic wave-absorbing material layer is 1.5-2.5 mm, the thickness of the resonance conducting plate is 0.5-0.8 mm, and the resonance conducting plate is arranged at the central position of the magnetic wave-absorbing material layer. The magnetic wave-absorbing material layer is provided with at least three layers.
In the technology, the magnetic wave-absorbing material layer is prepared from the following raw materials: 90-95% of light carrier material and 5-10% of magnetic wave-absorbing material.
Specifically, the method comprises the following steps: the light carrier material comprises 25-45% of epoxy resin, 45-50% of polyethylene foam, 1-2% of dispersant polyethylene glycol, 3-4% of flame retardant pentaerythritol, 1-2% of thickener hydroxyethyl cellulose and 1-2% of initiator ammonium persulfate. The magnetic wave-absorbing material comprises 80-95% of hydroxyl iron powder and 5-20% of conductive agent carbon black.
According to the technical scheme, the incident angle of the electromagnetic waves is changed by using the magnetic wave-absorbing material layers with different densities, so that the electromagnetic waves are refracted and reflected for multiple times in the wave-absorbing material, and the wave-absorbing capacity is improved. Meanwhile, the plurality of magnetic wave-absorbing material layers with different densities refract the electromagnetic waves with larger incident angles to the maximum extent, the incident angle of the magnetic wave-absorbing material layer with different densities entering the next layer is reduced each time, the wave-absorbing capacity is improved, and the reflection of the electromagnetic waves is reduced.
It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by one of ordinary skill in the art and related arts based on the embodiments of the present invention without any creative effort, shall fall within the protection scope of the present invention. Structures, devices, and methods of operation not specifically described or illustrated herein are generally practiced in the art without specific recitation or limitation.

Claims (7)

1. The electromagnetic wave-absorbing material is characterized by comprising a metal base plate and at least two magnetic wave-absorbing material layers arranged on the metal base plate, wherein the density of the magnetic wave-absorbing material layers is gradually increased from a position far away from the metal base plate layer to a position close to the metal base plate layer, and a plurality of resonance conducting strips are uniformly distributed in each magnetic wave-absorbing material layer.
2. An electromagnetic wave absorbing material with improved oblique incidence performance according to claim 1, wherein the resonant conductive strips are all parallel to the metal base plate.
3. The electromagnetic wave absorbing material with the improved oblique incidence performance of claim 1, wherein the thickness of the magnetic wave absorbing material layer is 1.5-2.5 mm, the thickness of the resonance conducting strip is 0.5-0.8 mm, and the resonance conducting strip is arranged at the center of the magnetic wave absorbing material layer.
4. The electromagnetic wave-absorbing material with the improved oblique incidence performance of claim 1, wherein the magnetic wave-absorbing material layer is provided with not less than three layers.
5. The electromagnetic wave-absorbing material with the improved oblique incidence performance of claim 1, wherein the magnetic wave-absorbing material layer is prepared from the following raw materials: 90-95% of light carrier material and 5-10% of magnetic wave-absorbing material.
6. The electromagnetic wave absorbing material with the oblique incidence improving performance of claim 5, wherein the light carrier material comprises 25-45% of epoxy resin, 45-50% of polyethylene foam, 1-2% of dispersant polyethylene glycol, 3-4% of flame retardant pentaerythritol, 1-2% of thickener hydroxyethyl cellulose and 1-2% of initiator ammonium persulfate.
7. The electromagnetic wave absorbing material with the improved oblique incidence performance of claim 5, wherein the magnetic wave absorbing material comprises 80-95% of hydroxyl iron powder and 5-20% of conductive agent carbon black.
CN202010702687.9A 2020-07-21 2020-07-21 Electromagnetic wave-absorbing material with oblique incidence performance improvement Pending CN111806011A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000151179A (en) * 1998-11-10 2000-05-30 Kitagawa Ind Co Ltd Radio wave absorption material
JP2009188322A (en) * 2008-02-08 2009-08-20 New Industry Research Organization Radio wave absorber and method for manufacturing the same
CN101899221A (en) * 2010-07-02 2010-12-01 李勇 Foaming type electromagnetic wave absorption composite material and preparation method thereof
CN104320959A (en) * 2014-07-31 2015-01-28 电子科技大学 Metal-wire-loading type electromagnetic wave absorption structure improving performances of oblique incidence
CN108770327A (en) * 2018-06-22 2018-11-06 四川大学 A kind of gradient layer foaming absorbing material and preparation method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000151179A (en) * 1998-11-10 2000-05-30 Kitagawa Ind Co Ltd Radio wave absorption material
JP2009188322A (en) * 2008-02-08 2009-08-20 New Industry Research Organization Radio wave absorber and method for manufacturing the same
CN101899221A (en) * 2010-07-02 2010-12-01 李勇 Foaming type electromagnetic wave absorption composite material and preparation method thereof
CN104320959A (en) * 2014-07-31 2015-01-28 电子科技大学 Metal-wire-loading type electromagnetic wave absorption structure improving performances of oblique incidence
CN108770327A (en) * 2018-06-22 2018-11-06 四川大学 A kind of gradient layer foaming absorbing material and preparation method thereof

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