CN109971300A - A kind of microwave absorbing coating and preparation method thereof - Google Patents
A kind of microwave absorbing coating and preparation method thereof Download PDFInfo
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- CN109971300A CN109971300A CN201711444993.1A CN201711444993A CN109971300A CN 109971300 A CN109971300 A CN 109971300A CN 201711444993 A CN201711444993 A CN 201711444993A CN 109971300 A CN109971300 A CN 109971300A
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- 238000000576 coating method Methods 0.000 title claims abstract description 55
- 239000011248 coating agent Substances 0.000 title claims abstract description 41
- 238000002360 preparation method Methods 0.000 title claims abstract description 34
- 239000006096 absorbing agent Substances 0.000 claims abstract description 32
- 239000006229 carbon black Substances 0.000 claims abstract description 31
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 24
- 229920005989 resin Polymers 0.000 claims abstract description 16
- 239000011347 resin Substances 0.000 claims abstract description 16
- 239000011159 matrix material Substances 0.000 claims abstract description 15
- 229910000077 silane Inorganic materials 0.000 claims abstract description 7
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 19
- 239000003795 chemical substances by application Substances 0.000 claims description 17
- 239000000203 mixture Substances 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 11
- 238000000498 ball milling Methods 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 239000007822 coupling agent Substances 0.000 claims description 8
- -1 alkenyl silane Chemical compound 0.000 claims description 7
- 239000000758 substrate Substances 0.000 claims description 5
- RPNUMPOLZDHAAY-UHFFFAOYSA-N Diethylenetriamine Chemical compound NCCNCCN RPNUMPOLZDHAAY-UHFFFAOYSA-N 0.000 claims description 4
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 claims description 4
- 239000005864 Sulphur Substances 0.000 claims description 4
- 125000005442 diisocyanate group Chemical group 0.000 claims description 4
- NAQMVNRVTILPCV-UHFFFAOYSA-N hexane-1,6-diamine Chemical compound NCCCCCCN NAQMVNRVTILPCV-UHFFFAOYSA-N 0.000 claims description 4
- NEHMKBQYUWJMIP-UHFFFAOYSA-N chloromethane Chemical compound ClC NEHMKBQYUWJMIP-UHFFFAOYSA-N 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical group O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 2
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 claims 1
- 229910003978 SiClx Inorganic materials 0.000 claims 1
- 229910052799 carbon Inorganic materials 0.000 claims 1
- WQPDQJCBHQPNCZ-UHFFFAOYSA-N cyclohexa-2,4-dien-1-one Chemical group O=C1CC=CC=C1 WQPDQJCBHQPNCZ-UHFFFAOYSA-N 0.000 claims 1
- 238000010521 absorption reaction Methods 0.000 abstract description 14
- 150000001875 compounds Chemical class 0.000 abstract description 9
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052710 silicon Inorganic materials 0.000 abstract description 4
- 239000010703 silicon Substances 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000010287 polarization Effects 0.000 abstract 1
- 235000019241 carbon black Nutrition 0.000 description 24
- 230000004048 modification Effects 0.000 description 7
- 238000012986 modification Methods 0.000 description 7
- 239000004411 aluminium Substances 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 6
- 238000010907 mechanical stirring Methods 0.000 description 6
- 238000001291 vacuum drying Methods 0.000 description 6
- 239000003822 epoxy resin Substances 0.000 description 5
- 229920000647 polyepoxide Polymers 0.000 description 5
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 4
- 239000004593 Epoxy Substances 0.000 description 4
- 239000011358 absorbing material Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 229920001568 phenolic resin Polymers 0.000 description 4
- 239000005011 phenolic resin Substances 0.000 description 4
- 229920005749 polyurethane resin Polymers 0.000 description 4
- LGRFSURHDFAFJT-UHFFFAOYSA-N Phthalic anhydride Natural products C1=CC=C2C(=O)OC(=O)C2=C1 LGRFSURHDFAFJT-UHFFFAOYSA-N 0.000 description 3
- JHIWVOJDXOSYLW-UHFFFAOYSA-N butyl 2,2-difluorocyclopropane-1-carboxylate Chemical compound CCCCOC(=O)C1CC1(F)F JHIWVOJDXOSYLW-UHFFFAOYSA-N 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000003618 dip coating Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 125000003342 alkenyl group Chemical group 0.000 description 2
- 150000008064 anhydrides Chemical class 0.000 description 2
- 230000001680 brushing effect Effects 0.000 description 2
- 239000003610 charcoal Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000005670 electromagnetic radiation Effects 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 238000005325 percolation Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000011856 silicon-based particle Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
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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
- C09D161/00—Coating compositions based on condensation polymers of aldehydes or ketones; Coating compositions based on derivatives of such polymers
- C09D161/04—Condensation polymers of aldehydes or ketones with phenols only
- C09D161/06—Condensation polymers of aldehydes or ketones with phenols only of aldehydes with phenols
-
- 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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
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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
- C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
- C09D4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09D159/00 - C09D187/00
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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
- 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
- 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
- C08K2201/00—Specific properties of additives
- C08K2201/001—Conductive additives
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- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
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- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
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- 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
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/15—Heterocyclic compounds having oxygen in the ring
- C08K5/151—Heterocyclic compounds having oxygen in the ring having one oxygen atom in the ring
- C08K5/1535—Five-membered rings
- C08K5/1539—Cyclic anhydrides
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- 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
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/17—Amines; Quaternary ammonium compounds
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- 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
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
- C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Paints Or Removers (AREA)
Abstract
Then microwave absorbing coating provided by the invention and preparation method thereof is compound in matrix resin and carrys out the excellent wave absorbing agent of processability by the way that micrometer silicon carbide silicon and carbon black is compound and with silane coupler modified.Electromagnetic wave is lost by dielectric polarization relaxation in silicon carbide, and magnetic property is poor, carbon black has good electric conductivity, light weight, cheap, but that there are still absorption peaks is small, absorbs the disadvantages of bandwidth is narrow, the advantages of present invention both combines, micrometer silicon carbide silicon and carbon black is compound and with the silane coupler modified wave absorbing agent excellent come processability.Preparation method provided by the present invention is simple, easy to industrialized production, can be widely used in the technical fields such as clutter recognition, the electromagnetism interference of mobile phone, electronic equipment, high-frequency apparatus, microwave active device, radar and microwave telecommunication system.
Description
Technical field
The present invention relates to field of compound material, specifically, a kind of microwave absorbing coating and preparation method thereof.
Background technique
With the development of electronic science and technology, electronic information equipment is all widely used in all trades and professions.Electromagnetism
Influence of the wave to the mankind has also penetrated into each corner.It is all irreplaceable in machinery, electronics, biological field.Electromagnetism skill
While art has brought great convenience, the serious electromagnetic radiation pollution that has also seriously attracted.Electromagnetic radiation is not only
Electronic instrument and equipment can be interfered, causes it that cannot run well, also will affect the health of the mankind, interference human normal is raw
Manage function, in some instances it may even be possible to lead to disease.Therefore, the absorbing material for administering electromagnetic pollution comes into being.
Absorbing material is to absorb or decay incident electromagnetic wave, and its electromagnetic energy is converted into thermal energy consumption and is dissipated
Or a kind of material for making electromagnetic wave disappear by interference.In engineering field, all there is absorption peaks for current most of absorbing materials
It is worth the disadvantages of small, absorption bandwidth is narrow, therefore, how to expand absorption bandwidth in the case where ensuring absorbing property is exactly industry always
The problem of urgent need to resolve.
Summary of the invention
For the problems in the relevant technologies, the present invention has studied a kind of microwave absorbing coating and preparation method thereof, is absorbed with expanding
Bandwidth.
The preparation method of microwave absorbing coating provided by the invention, comprising: carbon black and silicon carbide are mixed, obtain mixture, so
Silane coupling agent is added in the backward mixture, ball milling obtains wave absorbing agent；Matrix resin and curing agent are mixed, stirring is equal
It is even, the wave absorbing agent is then added, stirs evenly, obtains antiradar coatings, and the antiradar coatings are coated on substrate, Gu
Change, microwave absorbing coating is made.
In the above preparation method, in the mixture, the mass ratio of the carbon black and the silicon carbide is 0.5~
1.5:6~10.
In the above preparation method, the mixture, the silane coupling agent, described matrix resin and the curing agent
Mass ratio is 50~66:2~5:30~40:2~5.
In the above preparation method, the carbon black is selected from one of acetylene carbon black, conductive black or a variety of combinations.
In the above preparation method, the silane coupling agent be selected from alkenyl silane coupling agent, chlorocarbon base silane coupling agent,
One of amino-alkyl silicane coupling agent, epoxyhydrocarbyl silane coupling agent, more sulphur hydrocarbyl si lanes coupling agents or a variety of combinations.
In the above preparation method, described matrix resin is selected from one of epoxy resin, phenolic resin, polyurethane resin
Or a variety of combination.
In the above preparation method, the curing agent be selected from maleic anhydride, phthalic anhydride, ethylenediamine, oneself two
One of amine, diethylenetriamine, diisocyanate or a variety of combinations.
In the above preparation method, described matrix resin and the curing agent are mixed, stir 10~20min, then plus
Enter the wave absorbing agent, stirs 30~60min, obtain antiradar coatings.
In the above preparation method, the mode of the coating includes one of brushing, spraying, dip-coating or a variety of groups
It closes.
In the above preparation method, the cured condition is to solidify 2~4h at 75~85 DEG C respectively, 95~105
Solidify 1~3h at DEG C, solidify 2~4h at 115~125 DEG C.
In the above preparation method, the microwave absorbing coating with a thickness of 1~3mm.
The microwave absorbing coating prepared by the above method.
The preparation method of microwave absorbing coating provided by the invention, by the way that micrometer silicon carbide silicon and carbon black is compound and with silane coupled
Agent is modified, is then compound in matrix resin and carrys out the excellent wave absorbing agent of processability, can expand in the case where ensuring absorbing property
It is big to absorb bandwidth.Preparation method provided by the present invention is simple, easy to industrialized production, can be widely used in mobile phone, electronics
Instrument and equipment, high-frequency apparatus, microwave active device, the technologies such as clutter recognition, electromagnetism interference of radar and microwave telecommunication system
Field, according to different application bands, the dense and formula of adjustable function material is made and inhales wave film and coating.
Specific embodiment
Below in conjunction with the embodiment of the present invention, technical solution in the embodiment of the present invention is clearly and completely retouched
It states, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on the present invention
In embodiment, those of ordinary skill in the art's every other embodiment obtained shall fall within the protection scope of the present invention.
The preparation method of microwave absorbing coating provided by the invention, comprising the following steps:
Firstly, a certain amount of carbon black and silicon carbide are mixed, mixture is obtained, is then added into mixture silane coupled
Agent, ball milling obtain wave absorbing agent.In this step, by mass fraction, 50~66 parts are mixed by what carbon black and silicon carbide were mixed to get
Object and 2~5 parts of silane coupling agents are closed, ball milling is uniformly mixed it in the ball mill, obtains modified wave absorbing agent, wherein mixed
It closes in object, the mass ratio of carbon black and silicon carbide is 0.5~1.5:6~10, and carbon black is selected from one of acetylene carbon black, conductive black
Or a variety of combinations, silane coupling agent are selected from alkenyl silane coupling agent, chlorocarbon base silane coupling agent, amino-alkyl silicane coupling
One of agent, epoxyhydrocarbyl silane coupling agent, more sulphur hydrocarbyl si lanes coupling agents or a variety of combinations.In this step, SiC belongs to
In semiconductor, there is certain wave-sucking performance and preferable wave transparent, guided wave performance, can make electromagnetic wave as much as possible from surface into
Enter media interior, nano SiC powder structure mainly cellular spherical in shape, and serious agglomeration, average grain diameter 30-60nm, carbonization
Silicon particle is different, is in mainly strip structure, equivalent grain size is distributed more widely, about in 0.3-4.5 μ m, due to item
The structure of shape and piece shape has bigger reflection and scattering section than spherical structure, to be conducive to increase electromagnetic wave in sample
Portion carries out the probability of multiple reflections and scattering, and wave absorbing agent is made to reach multiple absorption to electromagnetic wave.Silicon carbide and charcoal is made in the present invention
Black modification wave absorbing agent, and be compound in resin, when SiC content is less, the isolated islandization of absorbing medium can be effective in matrix
It improves and inhales wave efficiency, but after SiC content is higher, the wave-absorbing effect of coating declines rapidly, this is because excessive silicon carbide
Reunite in the base, leading to its structure not is previous strip and sheet, electromagnetic wave can not largely be scattered, and
And particle volume increases after reuniting, its own can also decline the absorbent properties of electromagnetic wave, it is therefore desirable to strict control silicon carbide
Content.In this step, when carbon black mass score is lower, conductivity decline is slow, this is because between carbon black particle
Away from larger, the probability for forming chain conductive channel at this time is smaller, and mainly tunnel-effect works, when carbon black mass score increases
When, resistivity decline because carbon black particle increases, interparticle distance becomes smaller, and chain channel is just increasingly becoming main function, this by
High resistance state is known as vadose region to the region of low resistance state drastic shift, and transition point is the percolation threshold of system, works as charcoal
When black mass fraction is more than a certain amount of, conductive network is essentially formed, and change in resistance will tend towards stability after this.In addition,
When content of carbon black is smaller, the echo attenuation ratio for improving coating is added, this is because when content of carbon black is lower, between particle
Distance farther out, at this time formed chain conductive channel probability it is smaller, carbon black pellet disperse increases interface pole at conductive isolated island
Rate, when content of carbon black is higher, interparticle distance becomes smaller, and chain channel is largely formed, and then constitutes conductive network decaying electromagnetic wave,
It is added silicon carbide on this basis, conductive network in further perfect composite coating, coating conductivity with higher causes
The impedance of the input wave impedance and free space of coating seriously mismatches, in a large amount of reflection electromagnetic waves of coating surface, so that coating
Absorbing property decline, therefore, it is necessary to strictly control the content of carbon black, to guarantee that it is good that the microwave absorbing coating that finally prepares has
Conduction and absorbing property.
Then, matrix resin and curing agent are mixed, stirs evenly, wave absorbing agent is then added, stirs evenly, obtain inhaling wave
Coating.In this step, matrix resin and curing agent are mixed, 10~20min of mechanical stirring is allowed to uniformly mixed, then plus
Enter above-mentioned wave absorbing agent, stir 30~60min, keeps suction wave absorbing agent evenly dispersed in matrix resin, antiradar coatings are made, wherein
Matrix resin is selected from one of epoxy resin, phenolic resin, polyurethane resin or a variety of combinations, and curing agent is selected from maleic
One of dicarboxylic anhydride, phthalic anhydride, ethylenediamine, hexamethylene diamine, diethylenetriamine, diisocyanate or a variety of combinations,
In conjunction with above-mentioned steps, mixture, silane coupling agent, matrix resin and curing agent mass ratio be 50~66:2~5:30~40:2
~5.
Finally, antiradar coatings are coated on substrate, microwave absorbing coating is made in solidification.In this step, using brushing, spray
Antiradar coatings are coated on substrate by one of painting, dip-coating or a variety of combined methods, are placed in a vacuum drying oven, and are kept
Then vacuum solidifies 2~4h at 75~85 DEG C respectively, at 95~105 DEG C solidifies 1~3h, at 115~125 DEG C solidifies 2
The microwave absorbing coating with a thickness of 1~3mm is made, wherein substrate can be aluminium sheet in~4h.
Performance test:
Absorbing property: the absorbing property of microwave absorbing coating is adopted in no echo darkroom using HP8510B vector network analyzer
It is tested with arch method, test frequency range is 2~18GHz.
Embodiment 1
By mass fraction, 1 part of acetylene carbon black and 6 parts of silicon carbide are mixed, 0.7 part of alkenyl silane is then added thereto
Coupling agent, ball milling is uniformly mixed it in the ball mill, obtains modified wave absorbing agent.Then take 5.6 parts of epoxy resin and 0.7 part it is suitable
Anhydride maleique, mechanical stirring 10min are allowed to uniformly mix, and modification wave absorbing agent made above is added in mixed liquor, stirring
30min keeps wave absorbing agent evenly dispersed in the epoxy, obtains antiradar coatings, is then squeegeed on aluminium sheet, to prepare thickness
The microwave absorbing coating of 2mm, is finally placed in a vacuum drying oven, and keeps vacuum, solidifies 2h at 80 DEG C, solidify 1h at 100 DEG C,
Solidify 2h at 120 DEG C.
The echo attenuation ratio of the microwave absorbing coating is superior to -10dB in 11.3~16.4GHz wide frequency range, absorbs peak maximum
Up to -26dB, absorption bandwidth is greatly expanded in the case where ensuring absorbing property.
Embodiment 2
By mass fraction, 1 part of conductive black and 10 parts of silicon carbide are mixed, 0.33 part of chlorine silicon alkyl is then added thereto
Alkane coupling agent, ball milling is uniformly mixed it in the ball mill, obtains modified wave absorbing agent.Then 5 parts of epoxy resin and 0.33 part are taken
Phthalic anhydride, mechanical stirring 20min are allowed to uniformly mix, and modification wave absorbing agent made above is added in mixed liquor, is stirred
60min is mixed, keeps wave absorbing agent evenly dispersed in the epoxy, antiradar coatings is obtained, is then squeegeed on aluminium sheet, with preparation
The microwave absorbing coating of thick 2mm, is finally placed in a vacuum drying oven, and keeps vacuum, solidifies 4h at 80 DEG C, solidify 3h at 100 DEG C,
Solidify 4h at 120 DEG C.
The echo attenuation ratio of the microwave absorbing coating is superior to -10dB in 7.2~13.1GHz wide frequency range, and absorption peak is maximum
Value reaches -39dB, and absorption bandwidth is greatly expanded in the case where ensuring absorbing property.
Embodiment 3
By mass fraction, 1 part of acetylene carbon black and 8 parts of silicon carbide are mixed, 0.6 part of amino-alkyl silicane is then added thereto
Coupling agent, ball milling is uniformly mixed it in the ball mill, obtains modified wave absorbing agent.Then 4.95 parts of epoxy resin and 0.45 part are taken
Ethylenediamine, mechanical stirring 15min are allowed to uniformly mix, and modification wave absorbing agent made above is added in mixed liquor, stirring
40min keeps wave absorbing agent evenly dispersed in the epoxy, obtains antiradar coatings, is then sprayed on aluminium sheet, to prepare thickness
The microwave absorbing coating of 2mm, is finally placed in a vacuum drying oven, and keeps vacuum, solidifies 3h at 80 DEG C, solidify 2h at 100 DEG C,
Solidify 3h at 120 DEG C.
The echo attenuation ratio of the microwave absorbing coating is superior to -10dB in 7~12.5GHz wide frequency range, absorbs peak maximum
Up to -36dB, absorption bandwidth is greatly expanded in the case where ensuring absorbing property.
Embodiment 4
By mass fraction, 0.5 part of acetylene carbon black and 8 parts of silicon carbide are mixed, 0.62 part of epoxy hydrocarbon is then added thereto
Base silane coupling agent, ball milling is uniformly mixed it in the ball mill, obtains modified wave absorbing agent.Then take 5.41 parts of phenolic resin and
0.62 part of diethylenetriamine, mechanical stirring 12min are allowed to uniformly mix, and mixed liquor is added in modification wave absorbing agent made above
In, 50min is stirred, keeps wave absorbing agent evenly dispersed in phenolic resin, obtains antiradar coatings, be then sprayed on aluminium sheet,
It to prepare the microwave absorbing coating of thickness 1mm, is finally placed in a vacuum drying oven, keeps vacuum, solidify 4h at 75 DEG C, it is solid at 95 DEG C
Change 3h, solidifies 4h at 115 DEG C.
The echo attenuation ratio of the microwave absorbing coating is superior to -10dB in 7.2~12.8GHz wide frequency range, and absorption peak is maximum
Value reaches -32dB, and absorption bandwidth is greatly expanded in the case where ensuring absorbing property.
Embodiment 5
By mass fraction, 1.5 parts of acetylene carbon blacks and 10 parts of silicon carbide are mixed, sulphur hydrocarbon more than 0.88 part is then added thereto
Base silane coupling agent, ball milling is uniformly mixed it in the ball mill, obtains modified wave absorbing agent.Then 6.37 parts of polyurethane resins are taken
With 0.35 part of diisocyanate, mechanical stirring 18min is allowed to uniformly mix, and mixed liquor is added in modification wave absorbing agent made above
In, 45min is stirred, keeps wave absorbing agent evenly dispersed in polyurethane resin, obtains antiradar coatings, is then coated by dip-coating
On aluminium sheet, to prepare the microwave absorbing coating of thickness 3mm, finally it is placed in a vacuum drying oven, keeps vacuum, solidify 2h at 85 DEG C,
Solidify 1h at 105 DEG C, solidifies 2h at 125 DEG C.
The echo attenuation ratio of the microwave absorbing coating is superior to -10dB in the wide frequency range of 8.6~14.5GHz, and absorption peak is most
Big value reaches -37dB, and absorption bandwidth is greatly expanded in the case where ensuring absorbing property.
The preparation method of microwave absorbing coating provided by the invention, by the way that micrometer silicon carbide silicon and carbon black is compound and with silane coupled
Agent is modified, is then compound in matrix resin and carrys out the excellent wave absorbing agent of processability.The microwave absorbing coating prepared through the invention exists
Ensure greatly to expand absorption bandwidth in the case where absorbing property, so that absorbing property is excellent in 7~15GHz wide frequency range
It is different, and thickness is between 1~3mm, meet absorbing material for the composite request of " wide, thin, light, strong ", it is provided by the present invention
Preparation method it is simple, easy to industrialized production, can be widely used in mobile phone, electronic equipment, high-frequency apparatus, microwave has
The technical fields such as source device, the clutter recognition of radar and microwave telecommunication system, electromagnetism interference.
The above is merely preferred embodiments of the present invention, be not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of preparation method of microwave absorbing coating characterized by comprising
Carbon black and silicon carbide are mixed, mixture is obtained, silane coupling agent is then added into the mixture, ball milling obtains
Wave absorbing agent；
Matrix resin and curing agent are mixed, stirs evenly, the wave absorbing agent is then added, stirs evenly, obtains antiradar coatings,
And
The antiradar coatings are coated on substrate, microwave absorbing coating is made in solidification.
2. preparation method according to claim 1, which is characterized in that in the mixture, the carbon black and the carbon
The mass ratio of SiClx is 0.5~1.5:6~10.
3. preparation method according to claim 1, which is characterized in that the mixture, the silane coupling agent, the base
The mass ratio of body resin and the curing agent is 50~66:2~5:30~40:2~5.
4. preparation method according to claim 1, which is characterized in that the carbon black is in acetylene carbon black, conductive black
One or more combinations.
5. preparation method according to claim 1, which is characterized in that the silane coupling agent is coupled selected from alkenyl silane
Agent, chlorocarbon base silane coupling agent, amino-alkyl silicane coupling agent, epoxyhydrocarbyl silane coupling agent, in more sulphur hydrocarbyl si lanes coupling agents
One or more combinations.
6. preparation method according to claim 1, which is characterized in that the curing agent is selected from maleic anhydride, adjacent benzene
One of dicarboxylic acid anhydride, ethylenediamine, hexamethylene diamine, diethylenetriamine, diisocyanate or a variety of combinations.
7. preparation method according to claim 1, which is characterized in that described matrix resin and the curing agent are mixed,
10~20min is stirred, the wave absorbing agent is then added, 30~60min is stirred, obtains antiradar coatings.
8. preparation method according to claim 1, which is characterized in that the cured condition is respectively at 75~85 DEG C
Solidify 2~4h, solidify 1~3h, 2~4h of solidification at 115~125 DEG C at 95~105 DEG C.
9. preparation method according to claim 1, which is characterized in that the microwave absorbing coating with a thickness of 1~3mm.
10. a kind of microwave absorbing coating of preparation method preparations described in any item according to claim 1~9.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110724405A (en) * | 2019-11-28 | 2020-01-24 | 航天科工武汉磁电有限责任公司 | Corrosion-resistant wave-absorbing putty and preparation method thereof |
| CN114907144A (en) * | 2022-06-06 | 2022-08-16 | 吉林联科特种石墨材料有限公司 | Method for preparing SiC-C composite high-temperature coating by one-step method |
| CN116855120A (en) * | 2023-07-07 | 2023-10-10 | 西北工业大学 | Homogeneous flexible super-hydrophobic wave-absorbing coating, and preparation method and application thereof |
-
2017
- 2017-12-27 CN CN201711444993.1A patent/CN109971300A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110724405A (en) * | 2019-11-28 | 2020-01-24 | 航天科工武汉磁电有限责任公司 | Corrosion-resistant wave-absorbing putty and preparation method thereof |
| CN114907144A (en) * | 2022-06-06 | 2022-08-16 | 吉林联科特种石墨材料有限公司 | Method for preparing SiC-C composite high-temperature coating by one-step method |
| CN116855120A (en) * | 2023-07-07 | 2023-10-10 | 西北工业大学 | Homogeneous flexible super-hydrophobic wave-absorbing coating, and preparation method and application thereof |
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Application publication date: 20190705 |