CN110385903A - A kind of lightweight broad-band absorbing material and preparation method thereof based on impedance Meta Materials - Google Patents

A kind of lightweight broad-band absorbing material and preparation method thereof based on impedance Meta Materials Download PDF

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CN110385903A
CN110385903A CN201910782713.0A CN201910782713A CN110385903A CN 110385903 A CN110385903 A CN 110385903A CN 201910782713 A CN201910782713 A CN 201910782713A CN 110385903 A CN110385903 A CN 110385903A
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impedance
meta materials
absorbing material
carbon nanotube
band
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CN110385903B (en
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杨智慧
孙新
田江晓
张久霖
秦军峰
赵轶伦
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Beijing Institute of Environmental Features
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Beijing Institute of Environmental Features
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Abstract

The present invention relates to a kind of lightweight broad-band absorbing material and preparation method thereof based on impedance Meta Materials.The method are as follows: (1) carbon nanotube dust is distributed in resin solution, is configured to carbon nano tube paste, carbon nano tube paste blade coating is then obtained into carbon nanotube film on Kapton；(2) periodic structure being made of multiple periodic structure units is etched on the carbon nanotube film that step (1) obtains, and obtains impedance Meta Materials；(3) the impedance Meta Materials for obtaining step (2) are Nian Jie by binder with low dielectric media film, and the lightweight broad-band absorbing material then is made by solidification.The lightweight broad-band absorbing material produced by the present invention has excellent absorbing property in 8~18GHz wave band, and Absorber Bandwidth reaches 10GHz, and with light-weight, thickness is thin, the excellent characteristics of polarization insensitive.

Description

A kind of lightweight broad-band absorbing material and preparation method thereof based on impedance Meta Materials
Technical field
The invention belongs to absorbing material technical fields more particularly to a kind of lightweight broad-band based on impedance Meta Materials to inhale wave material Material and preparation method thereof.
Background technique
With the development of microwave sounding technology, system requires lightweight, the wideband absorbent properties of microwave absorbing material more next It is higher.Traditional absorbing material such as ferrite, carbonyl iron dust, metal fine powder etc. can only have in relatively narrow band limits and inhale wave Performance.Structural absorbing mater ials are the technical ways for realizing that wideband is stealthy, usually by the same glass of the absorbents such as graphite, carbon black Glass steel or foam are compound, form the structure type with certain mechanical strength, but structural absorbing mater ials realize the item of wideband Part is that have enough thickness, and this is that system structure itself is not had sometimes, limits structure to a certain extent and inhales wave The application of material.
Chinese patent application CN201811156780.3 discloses a kind of absorbing material, which includes Multi-layer graphite Alkene film and the low dielectric media film of multilayer, graphene film and low dielectric media film are stacked alternately, and surface is graphene film, bottom surface For low dielectric media film；Although the absorbing material in the patent application has excellent absorbing property in 2~40GHz wave band, Its thickness is just able to achieve the wide feature of absorption band there is still a need for 20mm or so has been reached, and density has also reached 0.3g/cm3It is left The right side, there are still the big problems of weight.
Therefore, it is highly desirable the big, absorption band for existing layer Radar Absorbents and composite construction absorbing material weight Narrow, the big problem of thickness proposes a kind of based on impedance Meta Materials lightweight broad-band absorbing material and preparation method thereof.
Summary of the invention
Previous conventional coatings absorbing material and composite construction absorbing material weight are big, absorption band is narrow in order to solve, thickness Big problem, the present invention provides a kind of lightweight broad-band absorbing material and preparation method thereof based on impedance Meta Materials.
To achieve the goals above, the present invention provides a kind of lightweight broad-band suction based on impedance Meta Materials in first aspect The preparation method of wave material, described method includes following steps:
(1) carbon nanotube dust is distributed in resin solution, is configured to carbon nano tube paste, then by the carbon nanometer Pipe slurry scratches on Kapton, obtains carbon nanotube film；
(2) periodic structure being made of multiple periodic structure units is etched on the carbon nanotube film that step (1) obtains, Obtain impedance Meta Materials；
(3) the impedance Meta Materials for obtaining step (2) are Nian Jie by binder with low dielectric media film, then by solidification The lightweight broad-band absorbing material is made.
Preferably, the impedance Meta Materials with a thickness of 0.101~0.151mm；And/or the thickness of the low dielectric media film Degree is 3~5mm.
Preferably, the periodic structure unit is regular hexagon, and the side length of the Internal periphery of regular hexagon is 3.6~3.8mm, The side length of the outer profile of regular hexagon be 4.65~4.85mm, and the center spacing of each adjacent two regular hexagon be 8.56~ 8.76mm。
Preferably, the sheet resistance for the carbon nanotube film that step (1) obtains is 30~80 Ω.
Preferably, the mass percentage of the carbon nanotube dust contained in the carbon nano tube paste is 1.5~15%.
Preferably, the low dielectric media film uses Polymethacrylimide, polyimides, politef, poly- second One of alkene, polyurethane or multiple material are made.
Preferably, the binder be selected from one of epoxy resin, unsaturated-resin, bismaleimide resin, phenolic resin or It is a variety of.
Preferably, in step (3), the cured temperature is 80~120 DEG C, and the cured time is 10~40min.
Preferably, the lightweight broad-band absorbing material is less than -5dB in the reflectivity of 8~18GHz wave band, and the lightweight is wide The density of frequency absorbing material is 0.05~0.1g/cm3。
The present invention provides made from the preparation method as the present invention described in first aspect in second aspect based on impedance The lightweight broad-band absorbing material of Meta Materials, the lightweight broad-band absorbing material include the impedance Meta Materials to bond together and low Jie Dielectric film, the impedance Meta Materials on the carbon nanotube film by etching the period being made of multiple periodic structure units Structure and formed.
The present invention at least has the following beneficial effects: compared with prior art
(1) the lightweight broad-band absorbing material in the present invention has excellent absorbing property in 8~18GHz wave band, 8 The reflectivity of~18GHz wave band is less than -5~-8dB, and Absorber Bandwidth reaches 10GHz, and absorbing property has the insensitive characteristic that polarizes.
(2) density of the lightweight broad-band absorbing material in the present invention is 0.05~0.1g/cm3, with a thickness of 3.101~ 5.151mm, the lightweight broad-band absorbing material have the excellent characteristics that light-weight, thickness is thin, absorbs wideband, polarization insensitive.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the lightweight broad-band absorbing material based on impedance Meta Materials in the present invention.
Fig. 2 is the schematic diagram of the periodic structure etched on carbon nanotube film in a specific embodiment of the invention.
Fig. 3 is lightweight broad-band absorbing material in the embodiment of the present invention 1 in horizontal polarization directions and vertical polarization directions Reflectance test result figure.In figure, abscissa Frequency indicates frequency, unit GHz, ordinate Reflectivity table Show reflectivity, unit dB；VV indicates vertical polarization directions, and HH indicates horizontal polarization directions.
Fig. 4 is lightweight broad-band absorbing material in the embodiment of the present invention 2 in horizontal polarization directions and vertical polarization directions Reflectance test result figure.In figure, abscissa Frequency indicates frequency, unit GHz, ordinate Reflectivity table Show reflectivity, unit dB；VV indicates vertical polarization directions, and HH indicates horizontal polarization directions.
Fig. 5 is lightweight broad-band absorbing material in the embodiment of the present invention 3 in horizontal polarization directions and vertical polarization directions Reflectance test result figure.In figure, abscissa Frequency indicates frequency, unit GHz, ordinate Reflectivity table Show reflectivity, unit dB；VV indicates vertical polarization directions, and HH indicates horizontal polarization directions.
In figure: 1: impedance Meta Materials；2: low dielectric media film.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with the embodiment of the present invention, to this hair Bright technical solution is clearly and completely described.Obviously, described embodiment is a part of the embodiments of the present invention, and The embodiment being not all of.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work Under the premise of every other embodiment obtained, shall fall within the protection scope of the present invention.
The present invention provides a kind of preparation method of lightweight broad-band absorbing material based on impedance Meta Materials in first aspect, Described method includes following steps:
(1) carbon nanotube dust is distributed in resin solution, is configured to carbon nano tube paste, then by the carbon nanometer Pipe slurry scratches on Kapton, obtains carbon nanotube film；In the present invention, the carbon nano tube paste is scratched On Kapton, the carbon nanotube film with a constant impedance is formed；In the present invention, the carbon nanotube film by Kapton and carbon nano-tube film composition；The carbon nano-tube film is scratched by the carbon nano tube paste described poly- It is formed on imide membrane (substrate)；
(2) on the carbon nanotube film that step (1) obtains etch (such as laser ablation) by it is multiple (two and two with On) periodic structure unit composition periodic structure, obtain impedance Meta Materials；It in the present invention, will be on the carbon nanotube film Specific period structure plan is etched, the Meta Materials with a constant impedance are formed；It in the present invention, is applied in the carbon nanotube The periodic structure is etched on the carbon nano-tube film that film includes；Specifically, for example, carbon nanotube film is placed in laser incising Instrument workbench vacuum suction is lost, the metamaterial structure model of design is imported, in the carbon nanotube that the carbon nanotube film includes 1~10 circulation (etching number) (such as 1,2,3,4,5,6,7,9 or 10 circulation of etching) is etched on film forms the week Phase structure obtains impedance Meta Materials；
(3) the impedance Meta Materials for obtaining step (2) are Nian Jie by binder with low dielectric media film, then by solidification The lightweight broad-band absorbing material is made；In the present invention, in one layer binder of external coating of low dielectric media film, then will The Kapton that the impedance Meta Materials include is pasted on one side on the low dielectric media film, by solid after the completion of bonding The lightweight broad-band absorbing material is made in change；In the present invention, low dielectric media film is also denoted as low dielectric media or low dielectric Dielectric material film.
In the present invention, by the etching period structure on the carbon nano-tube film that the carbon nanotube film includes, lead to Cross adjustment to periodic unit size can Effective Regulation film to the resonance characteristic of electromagnetic wave, realized using resonance to electromagnetic wave Wideband absorbs.The lightweight broad-band absorbing material produced by the present invention in 8~18GHz wave band there is excellent absorbing property (to inhale Receive performance), it is less than -5~-8dB in the reflectivity of 8~18GHz wave band, Absorber Bandwidth reaches 10GHz, and absorbing property has polarization Insensitive characteristic；The density of the lightweight broad-band absorbing material produced by the present invention is 0.05~0.1g/cm3, with a thickness of 3.101 ~5.151mm, the lightweight broad-band absorbing material have the excellent spy that light-weight, thickness is thin, absorbs wideband, polarization insensitive Point.
According to some preferred embodiments, the impedance Meta Materials with a thickness of 0.101~0.151mm (such as 0.101,0.11,0.12,0.13,0.14 or 0.151mm)；And/or the low dielectric media film with a thickness of 3~5mm (such as 3,3.5,4,4.5 or 5mm)；For example, as shown in Figure 1, the thickness of the impedance Meta Materials is indicated with d1, the low dielectric media The thickness of film is indicated with d2.In the present invention, the thickness d 2 of the low dielectric media film inhales wave to the lightweight broad-band obtained The absorbing property of material has a major impact, and d2 affects the position of resonance peak, and with the increase of d2, absorption peak will be toward low frequency side To movement, when d2 is not within the scope of 3~5mm, i.e. d2 is too thick or too Bao Douhui leads to the suction of the lightweight broad-band absorbing material Wave degradation, the Absorber Bandwidth that will lead to the lightweight broad-band absorbing material obtained narrow.
According to some preferred embodiments, the periodic structure unit is regular hexagon, for example, as shown in Fig. 2, positive six The side length a of the Internal periphery of side shape is 3.6~3.8mm, and the side length b of the outer profile of regular hexagon is 4.65~4.85mm, and every The center spacing c of two neighboring regular hexagon is 8.56~8.76mm.In the present invention, it is preferred to be for the periodic structure unit Regular hexagon, it is insensitive to polarizing since periodic structure unit is symmetrical pattern；In the present invention, it is preferred to be a be 3.6 ~3.8mm, b are 4.65~4.85mm, and c is 8.56~8.76mm, and the value of a, b and c are most important, this is because at this In invention, the value of a, b and c have a direct impact the absorbing property of the lightweight broad-band absorbing material obtained, including absorb Position, size and the Absorber Bandwidth at peak, in the present invention, the value of a, b and c not within the above range when, then not can guarantee system The lightweight broad-band absorbing material obtained has excellent absorbing property.
According to some preferred embodiments, the sheet resistance for the carbon nanotube film that step (1) obtains is 30~80 Ω (such as 30,40,50,60,70 or 80 Ω).In the present invention, described light made from the carbon nanotube film of different conductivity The corresponding Absorber Bandwidth of matter wideband wave absorbing material is different, and with the increase of conductivity, corresponding Absorber Bandwidth can become smaller, because This advantageously ensures that obtained absorption band is wide in the present invention, it is preferred to be the sheet resistance of carbon nanotube film be 30~80 Ω The lightweight broad-band absorbing material；In the present invention, the concentration of the sheet resistance and carbon nanotube of carbon nanotube film, carbon are received The thickness etc. of mitron film has relationship.
According to some preferred embodiments, the quality percentage of the carbon nanotube dust contained in the carbon nano tube paste Content be 1.5~15% (such as 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10%, 10.5%, 11%, 11.5%, 12%, 12.5%, 13%, 13.5%, 14%, 14.5% or 15%).
According to some preferred embodiments, the preparation of carbon nanotube film described in step (1) includes following sub-step:
(a) carbon nanotube dust, water and dispersing agent (such as KH560 dispersing agent) are uniformly mixed, obtain carbon nanotube point Dispersion liquid；Specifically, it is put into 1000mL beaker for example, weighing the carbon nanotube dust of 5~15g after purification, distilled water is added 50g, dispersing agent 0.5g, are put into double planetary mixer and stir 10~30min, the carbon nanotube dispersion being uniformly mixed Liquid；In the present invention, KH560 refers to γ-glycidyl ether oxygen propyl trimethoxy silicane；
(b) resin (such as acrylic resin) is added into the carbon nano tube dispersion liquid and is uniformly mixed, prepares and is formed The carbon nano tube paste；Specifically, for example, 75~95g propylene is added in the carbon nano tube dispersion liquid stirred evenly Acid resin stirs 10~30min in double planetary mixer, is then placed in ball mill and carries out 10~20min of ball milling, until slurry point It dissipates uniformly, forms the carbon nano tube paste；
(c) carbon nano tube paste of preparation is scratched to Kapton with scraper, is subsequently placed in baking oven Baking is copied, and the carbon nanotube film is obtained；Specifically, for example, weighing 20~30g carbon nano tube paste, using having a size of 150~ 200um scraper uniformly scratches carbon nano tube paste on the Kapton of thickness 100um, being placed in 140 DEG C of baking oven bakings Roasting 5~20min obtains the carbon nanotube film that sheet resistance is 30~80 Ω.
According to some preferred embodiments, the low dielectric media film uses Polymethacrylimide (PMI), polyamides One of imines, politef, polyethylene, polyurethane or multiple material are made.
According to some preferred embodiments, the binder is selected from epoxy resin, unsaturated-resin, bismaleimide resin, phenol One of urea formaldehyde is a variety of.
According to some preferred embodiments, in step (3), the cured temperature be 80~120 DEG C (such as 80 DEG C, 90 DEG C, 100 DEG C, 110 DEG C or 120 DEG C), the cured time be 10~40min (such as 10,20,25,30,35 or 40min)。
According to some preferred embodiments, the lightweight broad-band absorbing material is small in the reflectivity of 8~18GHz wave band In -5dB, the density of the lightweight broad-band absorbing material is 0.05~0.1g/cm3.In the present invention, reflectivity is negative value, instead Penetrate that rate is smaller (absolute value is bigger), the absorbing property of absorbing material is better.
According to some preferred embodiments, the lightweight broad-band absorbing material 8~18GHz wave band reflectivity not Greater than -8dB, and there is the insensitive characteristic that polarizes.
According to some specific embodiments, the preparation process of the lightweight broad-band absorbing material is as follows:
S1, carbon nano tube paste preparation
It weighs the carbon nanotube dust of 5-15g after purification to be put into 1000mL beaker, distilled water 50g, dispersing agent is added 0.5g is put into double planetary mixer and stirs 10-30min, obtains uniformly mixed carbon nano tube dispersion liquid；What is stirred evenly 75-95g acrylic resin is added in carbon nano tube dispersion liquid, 10-30min is stirred in double planetary mixer, is put into ball mill Ball milling 10-20min is carried out, until slurry is uniformly dispersed, forms carbon nano tube paste.
S2, carbon nano tube paste blade coating
20-30g carbon nano tube paste is weighed, is uniformly scratched carbon nano tube paste in thickness using 150-200um scraper On the Kapton of 100um, 140 DEG C of baking 5-20min of baking oven are placed in, the carbon that sheet resistance is 30~80 Ω is obtained and receives Mitron film.
S3, the preparation of impedance Meta Materials
Carbon nanotube film is placed in laser ablation instrument workbench vacuum suction, imports the metamaterial structure mould of design Type etches 1-10 circulation, obtains impedance Meta Materials.
S4, impedance Meta Materials and low dielectric media film are compound
In low one layer of epoxy resin of dielectric media film surface brushing, the Kapton for including by impedance Meta Materials is on one side It is pasted on low dielectric media film；After the completion of bonding, 100 DEG C of solidification 20-40min in high temperature furnace are put into, are obtained super based on impedance The lightweight broad-band absorbing material (the lightweight broad-band radar absorbing based on impedance Meta Materials) of material.
The present invention provides made from the preparation method as the present invention described in first aspect in second aspect based on impedance The lightweight broad-band absorbing material of Meta Materials, the lightweight broad-band absorbing material include the impedance Meta Materials to bond together and low Jie Dielectric film, the impedance Meta Materials on the carbon nanotube film by etching the period being made of multiple periodic structure units Structure and formed；In the present invention, for example, as shown in Figure 1, the lightweight broad-band absorbing material based on impedance Meta Materials is surpassed by impedance Material and low dielectric media film are constituted, and are double-layer structure, and first layer is impedance Meta Materials, and the second layer is low dielectric media film, In, the impedance Meta Materials are to etch the periodic structure on the carbon nanotube film and formed.
Below with reference to embodiment, the invention will be further described.These embodiments are only with regard to preferred implementation side of the invention Formula is illustrated, and protection scope of the present invention is not read as pertaining only to these embodiments.
Embodiment 1
A kind of lightweight broad-band radar absorbing based on impedance Meta Materials is prepared, the lightweight broad-band absorbing material is by impedance Meta Materials and low dielectric media film are constituted, and are double-layer structure, as shown in Figure 1；First layer is impedance Meta Materials, thickness d 1= 0.13mm, the second layer are low dielectric media film, and the low dielectric medium material used is Polymethacrylimide PMI, thickness d 2 =4mm.Wherein, impedance Meta Materials are the etching period structure on carbon nanotube film, and periodic structure unit is regular hexagon, week Phase structural unit and the periodic structure pattern of formation are as shown in Fig. 2, a=3.7mm, b=4.75mm, c=8.66mm.
The preparation process of lightweight broad-band radar absorbing based on impedance Meta Materials is as follows:
S1, carbon nano tube paste preparation
It weighs the carbon nanotube dust of 5g after purification to be put into 1000mL beaker, distilled water 50g, KH560 dispersion is added Agent 0.5g, is put into double planetary mixer and stirs 20min, obtains uniformly mixed carbon nano tube dispersion liquid；What is stirred evenly 95g acrylic resin is added in carbon nano tube dispersion liquid, 20min is stirred in double planetary mixer, is put into ball mill and carries out ball 15min is ground, until slurry is uniformly dispersed, forms carbon nano tube paste.
S2, carbon nano tube paste blade coating
20g carbon nano tube paste is weighed, is uniformly scratched carbon nano tube paste in thickness 100um's using 150um scraper On Kapton, 140 DEG C of baking 10min of baking oven are placed in, obtain the carbon nanotube film that sheet resistance is 80 Ω.
S3, the preparation of impedance Meta Materials
Carbon nanotube film is placed in laser ablation instrument workbench vacuum suction, imports the metamaterial structure mould of design Type etches 4 circulations, obtains impedance Meta Materials.
S4, impedance Meta Materials and low dielectric media film are compound
In low one layer of epoxy resin of dielectric media film surface brushing, the Kapton for including by impedance Meta Materials is on one side It is pasted on low dielectric media film；After the completion of bonding, 100 DEG C of solidification 30min in high temperature furnace are put into, are obtained based on impedance Meta Materials Lightweight broad-band absorbing material (the lightweight broad-band radar absorbing based on impedance Meta Materials).
The lightweight broad-band absorbing material made from the present embodiment is less than -8dB, absorption band in 8-18GHz wave band reflectivity Width reaches 10GHz, and absorbing property has the insensitive characteristic that polarizes, as shown in figure 3, the lightweight broad-band absorbing material is in not homopolarity Change the electro-magnetic wave absorption curve co-insides of (horizontal polarization directions, vertical polarization directions) under angle, there is the insensitive characteristic that polarizes；This The density of the lightweight broad-band absorbing material made from embodiment is 0.052g/cm3, with a thickness of 4.13mm, have light-weight, thick Spend excellent characteristics that are thin, absorbing wideband, polarization insensitive.
Embodiment 2
A kind of lightweight broad-band radar absorbing based on impedance Meta Materials is prepared, the lightweight broad-band absorbing material is by impedance Meta Materials and low dielectric media film are constituted, and are double-layer structure, as shown in Figure 1；First layer is impedance Meta Materials, thickness d 1= 0.13mm, the second layer are low dielectric media film, and the low dielectric medium material used is Polymethacrylimide PMI, thickness d 2 =8mm.Wherein, impedance Meta Materials are the etching period structure on carbon nanotube film, and periodic structure unit is regular hexagon, week Phase structural unit and the periodic structure pattern of formation are as shown in Fig. 2, a=3.7mm, b=4.75mm, c=8.66mm.
The preparation process of lightweight broad-band radar absorbing based on impedance Meta Materials is as follows:
S1, carbon nano tube paste preparation
It weighs the carbon nanotube dust of 5g after purification to be put into 1000mL beaker, distilled water 50g, KH560 dispersion is added Agent 0.5g, is put into double planetary mixer and stirs 20min, obtains uniformly mixed carbon nano tube dispersion liquid；What is stirred evenly 95g acrylic resin is added in carbon nano tube dispersion liquid, 20min is stirred in double planetary mixer, is put into ball mill and carries out ball 15min is ground, until slurry is uniformly dispersed, forms carbon nano tube paste.
S2, carbon nano tube paste blade coating
20g carbon nano tube paste is weighed, is uniformly scratched carbon nano tube paste in thickness 100um's using 150um scraper On Kapton, 140 DEG C of baking 10min of baking oven are placed in, obtain the carbon nanotube film that sheet resistance is 80 Ω.
S3, the preparation of impedance Meta Materials
Carbon nanotube film is placed in laser ablation instrument workbench vacuum suction, imports the metamaterial structure mould of design Type etches 4 circulations, obtains impedance Meta Materials.
S4, impedance Meta Materials and low dielectric media film are compound
In low one layer of epoxy resin of dielectric media film surface brushing, the Kapton for including by impedance Meta Materials is on one side It is pasted on low dielectric media film；After the completion of bonding, 100 DEG C of solidification 30min in high temperature furnace are put into, are obtained based on impedance Meta Materials Lightweight broad-band absorbing material (the lightweight broad-band radar absorbing based on impedance Meta Materials).
The lightweight broad-band absorbing material made from the present embodiment is less than -5dB, absorbability in 8-18GHz wave band reflectivity Can be slightly poor, absorbing property has the insensitive characteristic that polarizes, as shown in figure 4, the lightweight broad-band absorbing material is in different polarizing angles The electro-magnetic wave absorption curve co-insides of (horizontal polarization directions, vertical polarization directions) under degree have the insensitive characteristic that polarizes；This implementation The density of the lightweight broad-band absorbing material made from example is 0.057g/cm3。
Embodiment 3
A kind of lightweight broad-band radar absorbing based on impedance Meta Materials is prepared, the lightweight broad-band absorbing material is by impedance Meta Materials and low dielectric media film are constituted, and are double-layer structure, as shown in Figure 1；First layer is impedance Meta Materials, thickness d 1= 0.13mm, the second layer are low dielectric media film, and the low dielectric medium material used is Polymethacrylimide PMI, thickness d 2 =4mm.Wherein, impedance Meta Materials are the etching period structure on carbon nanotube film, and periodic structure unit is regular hexagon, week Phase structural unit and the periodic structure pattern of formation are as shown in Fig. 2, a=3.7mm, b=4.75mm, c=8.66mm.
The preparation process of lightweight broad-band radar absorbing based on impedance Meta Materials is as follows:
S1, carbon nano tube paste preparation
It weighs the carbon nanotube dust of 8g after purification to be put into 1000mL beaker, distilled water 50g, KH560 dispersion is added Agent 0.5g, is put into double planetary mixer and stirs 20min, obtains uniformly mixed carbon nano tube dispersion liquid；What is stirred evenly 95g acrylic resin is added in carbon nano tube dispersion liquid, 20min is stirred in double planetary mixer, is put into ball mill and carries out ball 15min is ground, until slurry is uniformly dispersed, forms carbon nano tube paste.
S2, carbon nano tube paste blade coating
20g carbon nano tube paste is weighed, is uniformly scratched carbon nano tube paste in thickness 100um's using 150um scraper On Kapton, 140 DEG C of baking 10min of baking oven are placed in, obtain the carbon nanotube film that sheet resistance is 40 Ω.
S3, the preparation of impedance Meta Materials
Carbon nanotube film is placed in laser ablation instrument workbench vacuum suction, imports the metamaterial structure mould of design Type etches 4 circulations, obtains impedance Meta Materials.
S4, impedance Meta Materials and low dielectric media film are compound
In low one layer of epoxy resin of dielectric media film surface brushing, the Kapton for including by impedance Meta Materials is on one side It is pasted on low dielectric media film；After the completion of bonding, 100 DEG C of solidification 30min in high temperature furnace are put into, are obtained based on impedance Meta Materials Lightweight broad-band absorbing material (the lightweight broad-band radar absorbing based on impedance Meta Materials).
The lightweight broad-band absorbing material made from the present embodiment is less than -7dB in the reflectivity of 8-18GHz wave band, absorbs Slightly inferior properties, absorbing property has the insensitive characteristic that polarizes, as shown in figure 5, the lightweight broad-band absorbing material is in not same polarization The electro-magnetic wave absorption curve co-insides of (horizontal polarization directions, vertical polarization directions) under angle have the insensitive characteristic that polarizes；This reality The density for applying the lightweight broad-band absorbing material made from example is 0.052g/cm3, with a thickness of 4.13mm, there is light-weight, thickness Excellent characteristics that are thin, absorbing wideband, polarization insensitive.
Comparative example 1
A kind of absorbing material is prepared, which is made of carbon nanotube film and low dielectric media film, is two layers of knot Structure；First layer is carbon nanotube film, and with a thickness of 0.13mm, the second layer is low dielectric media film, the low dielectric media material of use Material is Polymethacrylimide PMI, with a thickness of 4mm；In this comparative example, week is etched not on first layer carbon nanotube film Phase structure.
The preparation process of the absorbing material is as follows:
S1, carbon nano tube paste preparation
It weighs the carbon nanotube dust of 5g after purification to be put into 1000mL beaker, distilled water 50g, KH560 dispersion is added Agent 0.5g, is put into double planetary mixer and stirs 20min, obtains uniformly mixed carbon nano tube dispersion liquid；What is stirred evenly 95g acrylic resin is added in carbon nano tube dispersion liquid, 20min is stirred in double planetary mixer, is put into ball mill and carries out ball 15min is ground, until slurry is uniformly dispersed, forms carbon nano tube paste.
S2, carbon nano tube paste blade coating
20g carbon nano tube paste is weighed, is uniformly scratched carbon nano tube paste in thickness 100um's using 150um scraper On Kapton, 140 DEG C of baking 10min of baking oven are placed in, sheet resistance is the carbon nanotube film of 80 Ω.
S3, carbon nanotube film and low dielectric media film are compound
In low one layer of epoxy resin of dielectric media film surface brushing, the Kapton one for including by carbon nanotube film Face is pasted on low dielectric media film；After the completion of bonding, 100 DEG C of solidification 30min in high temperature furnace are put into, absorbing material is obtained.
The absorbing material made from this comparative example is less than -3dB in the reflectivity of 8-18GHz wave band, and absorbent properties are poor.
Comparative example 2
A kind of standby lightweight broad-band radar absorbing based on impedance Meta Materials, the lightweight broad-band absorbing material are surpassed by impedance Material and low dielectric media film are constituted, and are double-layer structure, as shown in Figure 1；First layer is impedance Meta Materials, thickness d 1= 0.13mm, the second layer are low dielectric media film, and the low dielectric medium material used is Polymethacrylimide PMI, thickness d 2 =1mm.Wherein, impedance Meta Materials are the etching period structure on carbon nanotube film, and periodic structure unit is regular hexagon, week Phase structural unit and the periodic structure pattern of formation are as shown in Fig. 2, a=3.7mm, b=4.75mm, c=8.66mm.
The preparation process of lightweight broad-band radar absorbing based on impedance Meta Materials is as follows:
S1, carbon nano tube paste preparation
It weighs the carbon nanotube dust of 5g after purification to be put into 1000mL beaker, distilled water 50g, KH560 dispersion is added Agent 0.5g, is put into double planetary mixer and stirs 20min, obtains uniformly mixed carbon nano tube dispersion liquid；What is stirred evenly 95g acrylic resin is added in carbon nano tube dispersion liquid, 20min is stirred in double planetary mixer, is put into ball mill and carries out ball 15min is ground, until slurry is uniformly dispersed, forms carbon nano tube paste.
S2, carbon nano tube paste blade coating
20g carbon nano tube paste is weighed, is uniformly scratched carbon nano tube paste in thickness 100um's using 150um scraper On Kapton, 140 DEG C of baking 10min of baking oven are placed in, obtain the carbon nanotube film that sheet resistance is 80 Ω.
S3, the preparation of impedance Meta Materials
Carbon nanotube film is placed in laser ablation instrument workbench vacuum suction, imports the metamaterial structure mould of design Type etches 4 circulations, obtains impedance Meta Materials.
S4, impedance Meta Materials and low dielectric media film are compound
In low one layer of epoxy resin of dielectric media film surface brushing, the Kapton for including by impedance Meta Materials is on one side It is pasted on low dielectric media film；After the completion of bonding, 100 DEG C of solidification 30min in high temperature furnace are put into, are obtained based on impedance Meta Materials Lightweight broad-band absorbing material (the lightweight broad-band radar absorbing based on impedance Meta Materials).
The lightweight broad-band absorbing material made from this comparative example is less than -3dB in the reflectivity of 8-18GHz wave band, inhales wave Performance is poor, the lightweight broad-band absorbing material under different polarisation angles (horizontal polarization directions, vertical polarization directions) electricity Electro-magnetic wave absorption curve co-insides have the insensitive characteristic that polarizes；The density of the lightweight broad-band absorbing material made from this comparative example For 0.052g/cm3, with a thickness of 1.13mm.
Finally, it is stated that: the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although ginseng It is described the invention in detail according to previous embodiment, those of ordinary skill in the art are it is understood that it still can be to each Technical solution documented by embodiment is modified or equivalent replacement of some of the technical features；And these are modified Or replacement, depart from the spirit and scope of the technical scheme of various embodiments of the present invention the essence of technical solution.

Claims (10)

1. a kind of preparation method of the lightweight broad-band absorbing material based on impedance Meta Materials, which is characterized in that the method includes Following steps:
(1) carbon nanotube dust is distributed in resin solution, is configured to carbon nano tube paste, then starch the carbon nanotube Material blade coating obtains carbon nanotube film on Kapton；
(2) periodic structure being made of multiple periodic structure units is etched on the carbon nanotube film that step (1) obtains, and is obtained Impedance Meta Materials；
(3) the impedance Meta Materials for obtaining step (2) are Nian Jie by binder with low dielectric media film, are then made by solidification The lightweight broad-band absorbing material.
2. preparation method according to claim 1, it is characterised in that:
The impedance Meta Materials with a thickness of 0.101~0.151mm；And/or
The low dielectric media film with a thickness of 3~5mm.
3. preparation method according to claim 1, it is characterised in that:
The periodic structure unit is regular hexagon, and the side length of the Internal periphery of regular hexagon is 3.6~3.8mm, regular hexagon The side length of outer profile is 4.65~4.85mm, and the center spacing of each adjacent two regular hexagon is 8.56~8.76mm.
4. preparation method according to any one of claims 1 to 3, it is characterised in that:
The sheet resistance for the carbon nanotube film that step (1) obtains is 30~80 Ω.
5. preparation method according to any one of claims 1 to 3, it is characterised in that:
The mass percentage of the carbon nanotube dust contained in the carbon nano tube paste is 1.5~15%.
6. preparation method according to any one of claims 1 to 3, it is characterised in that:
The low dielectric media film is using in Polymethacrylimide, polyimides, politef, polyethylene, polyurethane One or more materials be made.
7. preparation method according to any one of claims 1 to 3, it is characterised in that:
The binder is selected from one of epoxy resin, unsaturated-resin, bismaleimide resin, phenolic resin or a variety of.
8. preparation method according to any one of claims 1 to 3, it is characterised in that:
In step (3), the cured temperature is 80~120 DEG C, and the cured time is 10~40min.
9. preparation method according to any one of claims 1 to 3, it is characterised in that:
The lightweight broad-band absorbing material is less than -5dB in the reflectivity of 8~18GHz wave band, the lightweight broad-band absorbing material Density is 0.05~0.1g/cm3。
10. the lightweight broad-band as made from the described in any item preparation methods of claim 1 to 9 based on impedance Meta Materials inhales wave material Material, it is characterised in that: the lightweight broad-band absorbing material includes the impedance Meta Materials to bond together and low dielectric media film, institute Impedance Meta Materials are stated to be formed by etching on the carbon nanotube film by periodic structure that multiple periodic structure units form.
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CN111559133A (en) * 2020-05-29 2020-08-21 北京环境特性研究所 Wave absorbing/wave transmitting integrated material and preparation method thereof
CN111695217A (en) * 2020-06-09 2020-09-22 西安交通大学 Wide-angle wave-absorbing structure design method based on additive manufacturing
CN112261860A (en) * 2020-10-23 2021-01-22 航天特种材料及工艺技术研究所 Reusable micro-fluid wave-absorbing metamaterial and preparation method thereof
CN112829392A (en) * 2021-01-04 2021-05-25 北京环境特性研究所 High-temperature-resistant ultra-wideband wave-absorbing structure integrated material and preparation method thereof
CN112848600A (en) * 2021-01-04 2021-05-28 北京大学 Super-surface embedded bearing wave-absorbing laminated plate and preparation method thereof

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CN107181028A (en) * 2017-05-16 2017-09-19 中国电子科技集团公司第三十六研究所 A kind of frequency-selective surfaces structure and preparation method thereof
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CN107181028A (en) * 2017-05-16 2017-09-19 中国电子科技集团公司第三十六研究所 A kind of frequency-selective surfaces structure and preparation method thereof
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Publication number Priority date Publication date Assignee Title
CN111559133A (en) * 2020-05-29 2020-08-21 北京环境特性研究所 Wave absorbing/wave transmitting integrated material and preparation method thereof
CN111695217A (en) * 2020-06-09 2020-09-22 西安交通大学 Wide-angle wave-absorbing structure design method based on additive manufacturing
CN111695217B (en) * 2020-06-09 2021-12-28 西安交通大学 Wide-angle wave-absorbing structure design method based on additive manufacturing
CN112261860A (en) * 2020-10-23 2021-01-22 航天特种材料及工艺技术研究所 Reusable micro-fluid wave-absorbing metamaterial and preparation method thereof
CN112829392A (en) * 2021-01-04 2021-05-25 北京环境特性研究所 High-temperature-resistant ultra-wideband wave-absorbing structure integrated material and preparation method thereof
CN112848600A (en) * 2021-01-04 2021-05-28 北京大学 Super-surface embedded bearing wave-absorbing laminated plate and preparation method thereof

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