CN110591493A - Wave-absorbing material - Google Patents

Wave-absorbing material Download PDF

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Publication number
CN110591493A
CN110591493A CN201810608171.0A CN201810608171A CN110591493A CN 110591493 A CN110591493 A CN 110591493A CN 201810608171 A CN201810608171 A CN 201810608171A CN 110591493 A CN110591493 A CN 110591493A
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China
Prior art keywords
wave
absorbing
agent
carbonyl
absorbing material
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CN201810608171.0A
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Chinese (zh)
Inventor
刘若鹏
赵治亚
白敏�
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Luoyang Institute Of Jianduan Technology
Luoyang Advanced Technology Research Institute
Luoyang Advanced Equipment Technology Co Ltd
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Luoyang Institute Of Jianduan Technology
Luoyang Advanced Equipment Technology Co Ltd
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Priority to CN201810608171.0A priority Critical patent/CN110591493A/en
Publication of CN110591493A publication Critical patent/CN110591493A/en
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04—Polyurethanes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/32—Radiation-absorbing paints
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Laminated Bodies (AREA)

Abstract

The application provides a wave-absorbing material. The wave absorbing material comprises a resin matrix, a spherical carbonyl wave absorbing agent and a sheet carbonyl wave absorbing agent, wherein the spherical carbonyl wave absorbing agent and the sheet carbonyl wave absorbing agent are dispersed in the resin matrix. The wave absorbing material simultaneously comprises a sheet carbonyl group wave absorbing agent and a spherical carbonyl group wave absorbing agent, so that the wave absorbing material has good wave absorbing performance in a Ku wave band, and also has good wave absorbing performance in an X wave band, and further has broadband wave absorbing performance. And the two wave absorbing agents are dispersed in the matrix resin, so that the wave absorbing material has stable wave absorbing performance. In addition, the inventor researches and unexpectedly finds that the two wave absorbing agents have great synergistic effect, and the proportion of the two wave absorbing agents is adjusted, so that the dispersion mode and the lamination mode of the two wave absorbing agents with different particle sizes and morphologies are different, and the wave absorbing performance of the wave absorbing material in a Ku wave band and an X wave band can be adjusted.

Description

Wave-absorbing material
Technical Field
The application relates to the field of materials, in particular to a wave-absorbing material.
Background
The wave-absorbing paint is one of stealth paints in military, and the use of the wave-absorbing paint realizes over-the-horizon attack and invisible battle, so that the modern battle mode can be changed, and the wave-absorbing paint has great military benefits.
In addition, the wave-absorbing coating is widely applied to civil products, such as electromagnetic radiation protection of broadcast television transmitting stations, electromagnetic interference of microwave darkroom eliminating equipment, communication and navigation systems, security information confidentiality, electromagnetic protection of industrial science and medical equipment and the like. The wave-absorbing coating is coated on the outer surface of some key military engineering and confidential engineering, thereby ensuring the safety of buildings and shielding the radiation of electromagnetic waves.
In the wave-absorbing coating, mainly the electromagnetic wave absorbing agent in the coating plays a role in absorbing waves, the wave absorbing agent in the prior art mainly comprises ferrite wave-absorbing materials, carbon fiber wave-absorbing materials, nano wave-absorbing materials, chiral wave-absorbing materials, polycrystalline iron fiber wave-absorbing materials, conductive high polymer wave-absorbing materials and the like, but the wave-absorbing materials also have the defects of narrow frequency band, low efficiency, high density and the like, the application range of the wave-absorbing materials is limited to a certain extent, and the wave-absorbing coating prepared from the wave-absorbing materials has poor wave-absorbing performance.
Disclosure of Invention
The application mainly aims to provide a wave-absorbing material to solve the problem that the wave-absorbing material in the prior art is narrow in wave-absorbing bandwidth.
In order to achieve the above object, the present application provides a wave absorbing material comprising a resin matrix, a spherical carbonyl group wave absorber, and a sheet carbonyl group wave absorber, wherein the spherical carbonyl group wave absorber and the sheet carbonyl group wave absorber are dispersed in the resin matrix.
Further, in the wave absorbing material, the weight percentage of the resin matrix is 4-30%, the weight percentage of the spherical carbonyl wave absorber is 8-30%, and the weight percentage of the flaky carbonyl wave absorber is 40-80%.
Further, the particle size of the flaky carbonyl group wave absorber is 100 to 200 μm, and the particle size of the spherical carbonyl group wave absorber is 40 to 60 μm.
Furthermore, the wave-absorbing material also comprises a dispersing agent and a curing agent, wherein in the wave-absorbing material, the weight percentage of the dispersing agent is 1-3%, and the weight percentage of the curing agent is 2-5%.
The wave absorbing material further comprises a defoaming agent and a leveling agent, wherein the defoaming agent accounts for 1-3 wt%, the leveling agent accounts for 1-3 wt%, the curing agent accounts for 2-5 wt%, the resin matrix accounts for 6-15 wt%, the spherical carbonyl wave absorber accounts for 10-15 wt%, and the flaky carbonyl wave absorber accounts for 40-70 wt%.
Further, the spherical carbonyl-based wave absorbing agent includes spherical carbonyl iron powder.
Further, the flaky carbonyl group-based wave absorbing agent includes flaky carbonyl iron powder.
Further, the resin matrix includes at least one of epoxy resin, polyurethane, and polyester.
Further, the dispersant comprises one or more of polyvinylpyrrolidone, sodium hexametaphosphate, sodium pyrophosphate, sodium polyacrylate and polyvinyl alcohol.
Further, the curing agent includes a phenolic resin and/or an isocyanate.
By applying the technical scheme, the wave absorbing material simultaneously comprises the sheet carbonyl wave absorbing agent and the spherical carbonyl wave absorbing agent, the surface area of the sheet carbonyl wave absorbing agent is large, so that the wave absorbing material has good wave absorbing performance in a low frequency band, and the surface area of the spherical hydroxyl wave absorbing agent is small, so that the wave absorbing material has good wave absorbing performance in a high frequency band, further the wave absorbing material has good wave absorbing performance in a Ku wave band, and simultaneously has good wave absorbing performance in an X wave band, and the wave absorbing performance has broadband wave absorbing performance. And the two wave absorbing agents are dispersed in the matrix resin, so that the wave absorbing material has stable wave absorbing performance. In addition, the inventor researches and unexpectedly finds that the two wave absorbing agents have great synergistic effect, and the proportion of the two wave absorbing agents is adjusted, so that the dispersion mode and the lamination mode of the two wave absorbing agents with different particle sizes and morphologies are different, and the wave absorbing performance of the wave absorbing material in a Ku wave band and an X wave band can be adjusted.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present. Also, in the specification and claims, when an element is described as being "connected" to another element, the element may be "directly connected" to the other element or "electrically connected" to the other element through a third element.
As introduced in the background art, the wave-absorbing material in the prior art has a narrow wave-absorbing bandwidth, and in order to solve the technical problems, the present application provides a wave-absorbing material.
In a typical embodiment of the present application, a wave absorbing material is provided, which includes a resin matrix, a spherical carbonyl wave absorber, and a sheet carbonyl wave absorber, wherein the spherical carbonyl wave absorber and the sheet carbonyl wave absorber are dispersed in the resin matrix.
The wave-absorbing material simultaneously comprises a sheet carbonyl wave-absorbing agent and a spherical carbonyl wave-absorbing agent, wherein the sheet carbonyl wave-absorbing agent has a large surface area, so that the wave-absorbing material has good wave-absorbing performance in a low-frequency band, and the spherical hydroxyl wave-absorbing agent has a small surface area, so that the wave-absorbing material has good wave-absorbing performance in a high-frequency band, and further has good wave-absorbing performance in a Ku wave band and good wave-absorbing performance in an X wave band, and the wave-absorbing performance has broadband wave-absorbing performance. And the two wave absorbing agents are dispersed in the matrix resin, so that the wave absorbing material has stable wave absorbing performance. In addition, the inventor researches and unexpectedly finds that the two wave absorbing agents have great synergistic effect, and the proportion of the two wave absorbing agents is adjusted, so that the dispersion mode and the lamination mode of the two wave absorbing agents with different particle sizes and morphologies are different, and the wave absorbing performance of the wave absorbing material in a Ku wave band and an X wave band can be adjusted.
In an embodiment of the present application, in the wave-absorbing material, a weight percentage of the resin matrix is 4 to 30%, a weight percentage of the spherical carbonyl wave-absorbing agent is 8 to 30%, and a weight percentage of the flaky carbonyl wave-absorbing agent is 40 to 80%. The resin matrix with the content can ensure that two wave absorbing agents are more uniformly dispersed in the resin matrix, so that the stability of the wave absorbing performance of the wave absorbing material is further ensured, and the resin matrix with the content can further ensure that the wave absorbing material has good adhesive force, so that a device using the wave absorbing material can have stable wave absorbing performance for a long time; the spherical carbonyl group wave-absorbing agent in the content range can further ensure that the wave-absorbing material has good wave-absorbing performance in a Ku wave band; the flaky carbonyl wave absorbing agent in the content range can further ensure that the wave absorbing material has good performance in an X wave band; meanwhile, the content ratio of the sheet carbonyl wave absorber to the spherical carbonyl wave absorber can further improve the wave absorbing performance of the wave absorbing material in a Ku wave band and an X wave band, and further ensure that the wave absorbing material has wider wave absorbing bandwidth.
In order to further improve the wave absorbing performance of the wave absorbing material in a Ku wave band and an X wave band and further ensure that the wave absorbing bandwidth of the wave absorbing material is wide, in one embodiment of the application, the particle size of the sheet carbonyl wave absorbent is between 100 and 200 microns, and the particle size of the spherical carbonyl wave absorbent is between 40 and 60 microns.
In order to further enable the spherical carbonyl wave-absorbing agent and the flaky carbonyl wave-absorbing agent to be well dispersed in the resin matrix, the stability of the wave-absorbing performance of the wave-absorbing material is further ensured; meanwhile, in order to further improve the corrosion resistance of the wave-absorbing material; the wave absorbing performance of the wave absorbing material in a Ku wave band and an X wave band is further improved; in one embodiment of the application, the wave-absorbing material further comprises a dispersing agent and a curing agent, wherein the dispersing agent accounts for 1-3 wt% of the wave-absorbing material, and the curing agent accounts for 2-5 wt% of the wave-absorbing material.
In order to further accelerate the defoaming speed of the wave-absorbing material during the coating preparation, thereby improving the efficiency of the wave-absorbing material during the coating preparation; meanwhile, the surface of the formed coating is ensured to be smoother; furthermore, the spherical carbonyl wave-absorbing agent and the flaky carbonyl wave-absorbing agent can be well dispersed in the resin matrix, and the stability of the wave-absorbing performance of the wave-absorbing material is further ensured; the wave absorbing performance of the wave absorbing material in a Ku wave band and an X wave band is further improved; in one embodiment of the present application, the wave absorbing material further includes a defoaming agent and a leveling agent, wherein the defoaming agent accounts for 1-3 wt%, the leveling agent accounts for 1-3 wt%, the curing agent accounts for 2-5 wt%, the resin matrix accounts for 6-15 wt%, the spherical carbonyl wave absorber accounts for 10-15 wt%, and the flaky carbonyl wave absorber accounts for 40-70 wt%.
The wave absorbing agent of spherical carbonyl group in the present application may be any one of those in the prior art, and those skilled in the art can select an appropriate wave absorbing agent of spherical carbonyl group according to actual conditions.
In another embodiment of the present application, the wave absorbing agent of spherical carbonyl group comprises spherical carbonyl iron powder. The material has smaller surface area and better wave-absorbing performance in a high-frequency band.
Of course, the spherical hydroxyl group-based wave absorbing agent in the present application is not limited to the above-described spherical hydroxyl group-based iron powder, and may be other spherical hydroxyl group-based wave absorbing agents, for example, a spherical hydroxyl iron nickel aluminum alloy powder, or the like.
The sheet-like carbonyl wave absorbing agent in the present application may be any sheet-like carbonyl wave absorbing agent in the prior art, and those skilled in the art may select an appropriate sheet-like carbonyl wave absorbing agent according to actual conditions, for example, may also be sheet-like iron-nickel-aluminum alloy powder, and the like.
In order to further improve the wave absorbing performance of the wave absorbing powder in a low frequency band, in an embodiment of the present application, the sheet carbonyl group wave absorbing agent includes sheet carbonyl iron powder.
In order to further ensure that the two wave absorbing agents are more uniformly dispersed in the resin matrix, so that the stability of the wave absorbing performance of the wave absorbing material is further ensured, and the wave absorbing material has good adhesive force, so that a device using the wave absorbing material can have stable wave absorbing performance for a long time.
Of course, the resin matrix in the present application is not limited to the above-mentioned kind, and may be other resins, and those skilled in the art may select a suitable resin as the resin matrix of the wave-absorbing material according to actual situations.
In order to further ensure that the spherical carbonyl wave-absorbing agent and the flaky carbonyl wave-absorbing agent can be uniformly dispersed in the resin matrix, so as to further ensure that the wave-absorbing material has good wave-absorbing performance, in an embodiment of the application, the dispersing agent includes one or more of polyvinylpyrrolidone, sodium hexametaphosphate, sodium pyrophosphate, sodium polyacrylate and polyvinyl alcohol.
Similarly, the dispersing agent in the present application is not limited to the above-mentioned kind, and may be other dispersing agents, and those skilled in the art may select a suitable dispersing agent as the dispersing agent of the wave-absorbing material according to actual situations.
The curing agent in the application can be any curing agent which can be used in wave-absorbing materials in the prior art, and a person skilled in the art can select a proper kind of curing agent according to actual conditions.
In order to further improve the curing efficiency and curing effect of the wave-absorbing material and simultaneously improve the corrosion resistance of the wave-absorbing material, in an embodiment of the present application, the curing agent includes phenolic resin and/or isocyanate.
The defoaming agent in the application can be a conventional defoaming agent in the prior art, such as at least one of emulsified silicone oil, a high-carbon alcohol fatty acid ester compound, polyoxyethylene polyoxypropylene pentaerythritol ether and polyoxyethylene polyoxypropylene amine ether, and the defoaming agent can further improve the defoaming speed of the wave-absorbing material in the process of preparing a coating, so that the efficiency of the wave-absorbing material in the process of preparing the coating is further improved.
Of course, the defoaming agent in the present application is not limited to the above-mentioned kind, and other defoaming agents may also be used, and those skilled in the art may select a suitable defoaming agent as the defoaming agent of the wave-absorbing material according to actual situations.
The leveling agent can be acrylic or organosilicon modified leveling agent, such as one or more of BYK-103, BYK-333, BYK-307, BYK-377, BYK-378, BYK-394, BYK-UV3500, BYK-UV3505, BYK-UV3510 and BYK-306.
The manufacturing process of the wave-absorbing material is basically the same as that of the wave-absorbing material in the prior art, namely, the flaky hydroxyl wave-absorbing agent and the spherical hydroxyl wave-absorbing agent are dispersed in the resin matrix.
In order to make the technical solutions of the present application more clearly understood by those skilled in the art, the technical solutions of the present application will be described below with reference to specific embodiments.
Example 1
The wave-absorbing material comprises a resin matrix, a spherical carbonyl wave-absorbing agent and a sheet carbonyl wave-absorbing agent, wherein the weight percentages of the spherical carbonyl wave-absorbing agent, the sheet carbonyl wave-absorbing agent and the sheet carbonyl wave-absorbing agent are respectively 4%, 16% and 80%. Wherein the resin matrix is epoxy resin, the spherical carbonyl wave absorber is spherical carbonyl iron powder, the particle size of the spherical carbonyl iron powder is between 40 and 50 mu m, the flaky carbonyl iron powder is flaky carbonyl iron powder, and the particle size of the flaky carbonyl iron powder is between 100 and 150 mu m.
And coating the wave-absorbing material on a substrate to form a wave-absorbing layer.
Example 2
The wave absorbing material comprises a resin matrix, a spherical carbonyl wave absorbing agent, a flaky carbonyl wave absorbing agent, a dispersing agent, a curing agent, a defoaming agent and a leveling agent, wherein the weight percentages of the wave absorbing agent, the dispersing agent, the curing agent, the defoaming agent and the leveling agent are respectively 20%, 8%, 67%, 1%, 2%, 1% and 1%. The resin matrix is epoxy resin, the spherical carbonyl wave absorber is spherical carbonyl iron powder, the particle size of the spherical carbonyl iron powder is 50-60 mu m, the flaky carbonyl iron powder is flaky carbonyl iron powder, the particle size of the flaky carbonyl iron powder is 150-200 mu m, the dispersing agent is sodium pyrophosphate, the curing agent is phenolic resin, the defoaming agent is polydimethylsiloxane, and the flatting agent is BYK-103.
And coating the wave-absorbing material on a substrate to form a wave-absorbing layer.
Example 3
The wave absorbing material comprises a resin matrix, a spherical carbonyl wave absorbing agent, a flaky carbonyl wave absorbing agent, a dispersing agent, a curing agent, a defoaming agent and a leveling agent, wherein the weight percentages of the wave absorbing agent, the dispersing agent, the curing agent, the defoaming agent and the leveling agent are respectively 30%, 16%, 40%, 3%, 5%, 3% and 3%. The resin matrix is epoxy resin, the spherical carbonyl wave-absorbing agent is spherical carbonyl iron nickel aluminum alloy powder, the flaky carbonyl iron nickel aluminum alloy powder has a particle size of 50-60 mu m, the flaky carbonyl iron nickel aluminum alloy powder has a particle size of 150-200 mu m, the dispersing agent is sodium pyrophosphate, the curing agent is phenolic resin, the defoaming agent is polydimethylsiloxane, and the leveling agent is BYK-306.
And coating the wave-absorbing material on a substrate to form a wave-absorbing layer.
Example 4
The wave absorbing material comprises a resin matrix, spherical carbonyl wave absorbing agents, flaky carbonyl wave absorbing agents, dispersing agents, curing agents, defoaming agents and flatting agents, wherein the weight percentages of the wave absorbing agents, the dispersing agents, the curing agents, the defoaming agents and the flatting agents are respectively 6%, 30%, 55%, 2%, 3%, 2% and 2%. The resin matrix is epoxy resin, the spherical carbonyl wave absorber is spherical carbonyl iron powder, the flaky carbonyl wave absorber is flaky carbonyl iron powder, the particle size of the spherical carbonyl iron powder is 50-60 mu m, the particle size of the flaky carbonyl iron powder is 150-200 mu m, the dispersing agent is sodium pyrophosphate, the curing agent is isocyanate, the defoaming agent is polydimethylsiloxane, and the flatting agent is BYK-378.
And coating the wave-absorbing material on a substrate to form a wave-absorbing layer.
Example 5
The wave absorbing material comprises a resin matrix, spherical carbonyl wave absorbing agents, flaky carbonyl wave absorbing agents, dispersing agents, curing agents, defoaming agents and flatting agents, wherein the weight percentages of the wave absorbing agents, the dispersing agents, the curing agents, the defoaming agents and the flatting agents are respectively 15%, 10%, 70%, 1%, 2%, 1% and 1%. The resin matrix is epoxy resin, the spherical carbonyl wave absorber is spherical carbonyl iron powder, the flaky carbonyl wave absorber is flaky carbonyl iron powder, the particle size of the spherical carbonyl iron powder is 50-60 mu m, the particle size of the flaky carbonyl iron powder is 150-200 mu m, the dispersing agent is sodium pyrophosphate, the curing agent is isocyanate, the defoaming agent is polydimethylsiloxane, and the flatting agent is BYK-378.
And coating the wave-absorbing material on a substrate to form a wave-absorbing layer.
Example 6
The wave absorbing material comprises a resin matrix, a spherical carbonyl wave absorbing agent, a flaky carbonyl wave absorbing agent, a dispersing agent, a curing agent, a defoaming agent and a leveling agent, wherein the weight percentages of the wave absorbing agent, the dispersing agent, the curing agent, the defoaming agent and the leveling agent are respectively 10%, 15%, 65%, 2%, 4%, 2% and 2%. The resin matrix is epoxy resin, the spherical carbonyl wave absorber is spherical carbonyl iron powder, the flaky carbonyl wave absorber is flaky carbonyl iron powder, the particle size of the spherical carbonyl iron powder is 50-60 mu m, the particle size of the flaky carbonyl iron powder is 150-200 mu m, the dispersing agent is sodium pyrophosphate, the curing agent is isocyanate, the defoaming agent is polydimethylsiloxane, and the flatting agent is BYK-378.
And coating the wave-absorbing material on a substrate to form a wave-absorbing layer.
Example 7
The wave absorbing material comprises a resin matrix, a spherical carbonyl wave absorbing agent, a flaky carbonyl wave absorbing agent, a dispersing agent, a curing agent, a defoaming agent and a leveling agent, wherein the weight percentages of the wave absorbing agent, the dispersing agent, the curing agent, the defoaming agent and the leveling agent are respectively 12%, 13%, 65%, 2%, 4%, 2% and 2%. The resin matrix is epoxy resin, the spherical carbonyl wave absorber is spherical carbonyl iron powder, the flaky carbonyl wave absorber is flaky carbonyl iron powder, the particle size of the spherical carbonyl iron powder is 50-60 mu m, the particle size of the flaky carbonyl iron powder is 150-200 mu m, the dispersing agent is sodium pyrophosphate, the curing agent is isocyanate, the defoaming agent is polydimethylsiloxane, and the flatting agent is BYK-378.
And coating the wave-absorbing material on a substrate to form a wave-absorbing layer.
Example 8
The difference from example 7 is that the weight percentage of the resin matrix was 2%, and the weight percentage of the spherical carbonyl-based wave absorber was 23%.
Example 9
The difference from example 7 was that the weight percentage of the resin matrix was 2% and the weight percentage of the flaky carbonyl group-based wave absorbing agent was 75%.
Example 10
The difference from example 7 was that the weight percentage of the spherical carbonyl group-based wave absorbing agent was 23% and the weight percentage of the flaky carbonyl group-based wave absorbing agent was 55%.
Example 11
The difference from example 7 is that the particle size of the spherical carbonyl iron powder is 30 to 40 μm.
Example 12
The difference from the example 7 is that the particle size of the flaky carbonyl iron powder is between 90 and 100 mu m.
Comparative example 1
The differences from example 7 are: the wave absorbing material does not comprise a sheet carbonyl wave absorbing agent.
Comparative example 2
The differences from example 7 are: the wave absorbing material does not comprise spherical carbonyl wave absorbing agents.
The wave absorbing loss values of the wave absorbing powder in Ku wave band and X wave band in each embodiment are tested by adopting an arch field reflectivity test method, the defoaming time of the wave absorbing material in each embodiment in the manufacturing process is tested by visual inspection of a transparent test tube, and the specific test result is shown in Table 1.
TABLE 1
As can be seen from the data in the table, compared with the comparative example, the wave-absorbing materials of examples 1 to 12 have better wave-absorbing properties in Ku and X bands. In the embodiment 8, the resin matrix is less, and the spherical hydroxyl wave-absorbing agent is less, so that the wave-absorbing performance of the wave-absorbing material in a Ku wave band and an X wave band is poorer than that in the embodiment 7; the resin matrix of the embodiment 9 is less, and the flaky hydroxyl wave-absorbing agent is less, so that the wave-absorbing performance of the wave-absorbing material in a Ku wave band and an X wave band is poorer than that of the embodiment 7; the spherical hydroxyl wave-absorbing agent in the embodiment 10 is more, so that the wave-absorbing material has poorer wave-absorbing performance in an X wave band; compared with the embodiment 7, the embodiment 11 has the grain size of 30-40 nm, so that the wave-absorbing material has poor wave-absorbing performance in a Ku wave band, and compared with the embodiment 7, the embodiment 12 has the grain size of 90-100 nm, so that the wave-absorbing material has poor wave-absorbing performance in an X wave band.
From the above description, it can be seen that the above-described embodiments of the present application achieve the following technical effects:
the wave-absorbing material comprises the sheet carbonyl group wave-absorbing agent and the spherical carbonyl group wave-absorbing agent, so that the wave-absorbing material has good wave-absorbing performance in a Ku wave band, and also has good wave-absorbing performance in an X wave band, and the wave-absorbing performance has broadband wave-absorbing performance. And the two wave absorbing agents are dispersed in the matrix resin, so that the wave absorbing material has stable wave absorbing performance. In addition, the inventor researches and unexpectedly finds that the two wave absorbing agents have great synergistic effect, and if the proportion of only one of the two wave absorbing agents is adjusted, the dispersion mode and the lamination mode of the two wave absorbing agents with different particle sizes and morphologies are different, so that the wave absorbing performance of the wave absorbing material in a Ku wave band and an X wave band is influenced.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. The wave-absorbing material is characterized by comprising a resin matrix, a spherical carbonyl wave-absorbing agent and a sheet carbonyl wave-absorbing agent, wherein the spherical carbonyl wave-absorbing agent and the sheet carbonyl wave-absorbing agent are dispersed in the resin matrix.
2. The wave-absorbing material of claim 1, wherein the resin matrix comprises 4-30 wt%, the spherical carbonyl group-based wave-absorbing agent comprises 8-30 wt%, and the sheet carbonyl group-based wave-absorbing agent comprises 40-80 wt%.
3. The wave-absorbing material of claim 1, wherein the particle size of the sheet carbonyl wave-absorbing agent is between 100 and 200 μm, and the particle size of the spherical carbonyl wave-absorbing agent is between 40 and 60 μm.
4. The wave-absorbing material of claim 2, further comprising a dispersing agent and a curing agent, wherein in the wave-absorbing material, the dispersing agent accounts for 1-3 wt%, and the curing agent accounts for 2-5 wt%.
5. The wave absorbing material according to claim 4, further comprising 1-3 wt% of a defoaming agent and 1-3 wt% of a leveling agent, 2-5 wt% of a curing agent, 6-15 wt% of a resin matrix, 10-15 wt% of a spherical carbonyl wave absorber, and 40-70 wt% of a flaky carbonyl wave absorber.
6. The wave absorbing material of claim 1, wherein the spherical carbonyl-based wave absorbing agent comprises spherical carbonyl iron powder.
7. The wave absorbing material of claim 1, wherein the sheet carbonyl-based wave absorbing agent comprises sheet carbonyl iron powder.
8. The wave absorbing material of claim 1, wherein the resin matrix comprises at least one of epoxy, polyurethane, and polyester.
9. The wave-absorbing material of claim 4, wherein the dispersing agent comprises one or more of polyvinylpyrrolidone, sodium hexametaphosphate, sodium pyrophosphate, sodium polyacrylate, and polyvinyl alcohol.
10. A wave-absorbing material according to claim 4 wherein the curing agent comprises phenolic resin and/or isocyanate.
CN201810608171.0A 2018-06-13 2018-06-13 Wave-absorbing material Pending CN110591493A (en)

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