CN108966622A - A kind of ultra-wide incidence angle microwave absorbing material and preparation method thereof - Google Patents
A kind of ultra-wide incidence angle microwave absorbing material and preparation method thereof Download PDFInfo
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- CN108966622A CN108966622A CN201810909123.5A CN201810909123A CN108966622A CN 108966622 A CN108966622 A CN 108966622A CN 201810909123 A CN201810909123 A CN 201810909123A CN 108966622 A CN108966622 A CN 108966622A
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- absorbing material
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
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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
- C09D161/14—Modified phenol-aldehyde condensates
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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
- C09D5/24—Electrically-conducting paints
Abstract
The invention belongs to microwave absorbing material technical fields.The invention discloses a kind of ultra-wide incidence angle microwave absorbing materials, are made of the graphene conductive coating applied on the special-shaped honeycomb of the inclination made from flexible parent metal and flexible parent metal；The invention also discloses a kind of preparation methods of ultra-wide incidence angle microwave absorbing material comprising the design of ultra-wide incidence angle microwave absorbing material structure, printing graphene conductive coating generates sheet resistance distribution, preparation tilts special-shaped honeycomb on flexible material.Ultra-wide incidence angle microwave absorbing material in the present invention inhales wave frequency rate from millimeter wave to metric wave, incidence angle is from normal incidence to high incidence angle, the material has low cost, technique and product environmental protection, high mechanical strength simultaneously, density is low, service life is long, high temperature resistant and it is fire-retardant the advantages that, while the ultra-wide incidence angle microwave absorbing material in the present invention can shrink preservation, transportation cost and collection space can be reduced, the construction and use in secrecy test outfield are conducive to.
Description
Technical field
The present invention relates to microwave absorbing material technical field, more particularly, to a kind of ultra-wide incidence angle microwave absorbing material and
Preparation method.
Background technique
Existing suction wave darkroom material is designed and is optimized by normal incidence demand substantially, and the design in darkroom is on the contrary also by material
The performance of material influences, and all reduces the influence of reflection metope using abundant free space substantially.If the space for reducing darkroom needs
It asks, the cost in darkroom can be reduced, but more electromagnetic wave and absorbing material form high incidence angle and inhale wave.Root when darkroom design
According to application demand, the ranges of incidence angles at its each position is substantially constant, and most of darkroom belongs to such darkroom, adopts at this time
With common absorbing material and non-best choice.Such as the test of outfield antenna performance, it needs by earth's surface traveling wave and reflection removal, otherwise
High antenna and test platform position must be used, the cost of operation difficulty and platform is increased, and earth's surface traveling wave and earth surface reflection are all
Need high incidence angle absorbing material.
The performance of absorbing material is reduced with the increase of incident angle as shown in Fig. 1 a), in high incidence angle, is especially hung down
Straight polarization, absorbing property incident angle are reduced since 0 ° with the increase of angle, and reason has incident impedance with incidence angle
Variation, also there is the surface of absorbing material directly to reflect (Fig. 1 b).In order to realize the efficient suction of high incidence angle in a limited space
Receipts must satisfy two conditions, i.e., with the impedance matching of free space and inhale the incidence wave in wave frequency rate and angular range and reflection
The phase matched of wave, the electromagnetic consumable absorbing material of microwave dark room is mainly using the conduction for impregnating dielectric type electromagnetic consumable material
The non-structural type polyurethane foam of charcoal blacking, fine sharp conical shape are to meet and matching with the Microwave Impedance of free space
And the grading profile design done.
Summary of the invention
To solve the above problems, the present invention provides a kind of suction wave frequency rates from millimeter wave to metric wave, incidence angle is from normal incidence
To high incidence angle, have that low cost, technique and product environmental protection, high mechanical strength, density is low, the service life is long, high temperature resistant and fire-retardant
The advantages that ultra-wide incidence angle microwave absorbing material.
The present invention also provides a kind of preparation methods of ultra-wide incidence angle microwave absorbing material.
To achieve the above object, The technical solution adopted by the invention is as follows:
A kind of ultra-wide incidence angle microwave absorbing material, as the special-shaped honeycomb of the inclination as made from flexible parent metal and flexible parent metal
The graphene conductive coating of upper coating forms.
Preferably, flexible parent metal is selected from paper, cloth, plastic film, flexible foam plate and is bonded together shape by flexible material
At the hard plate of folding structure, flexible parent metal with a thickness of 0.01~20mm；As long as flexible parent metal meet in production technology and
Flexibility and intensity and and low weight under use condition；Further, flexible parent metal is fire-retardant brown paper, aramid paper
Or glass-fiber-fabric, surface density are 20~500g/m2。
Preferably, flexible parent metal is fire-retardant brown paper, surface density 180g/m2, honeycomb side length is 1~5cm.
Preferably, graphene conductive coating is made of graphene, adhesive and solvent, viscosity is 100~
3000mPa s, the content for spending graphene is 1~40wt%, and the content of adhesive is 10~60wt%, the content of solvent is 0~
60wt%；The carbon content of graphene conductive coating is higher than 97wt%, and draw ratio is greater than 500；
Preferably, the median particle diameter d of graphene50Less than 15 μm.
Preferably, adhesive is phenol-formaldehyde resin modified, solvent is butyl glycol ether.
Preferably, further including the conductive black of 3~20wt% in graphene conductive coating.
Preferably, being also added with 2wt% polyacrylic acid levelling agent in graphene conductive coating.
Preferably, graphene is as sulfur-free expandable graphite through graphite worm made from 600~900 DEG C of high-temperature expansions,
Its specific surface area is greater than 60g/m2。
Preferably, the cellular inclination angle of inclination abnormity is 0~60 °.
A kind of ultra-wide incidence angle microwave absorbing material, the material are honeycombs, which can be tiltedly
Angle and at any angle, the angle can be abnormity, special-shaped honeycomb knot normally close to incidence angle (Fig. 1 c) and honeycomb section
Structure refers to that non-constant (common honeycomb is the same in the cross section of any height, is constant for the cross section of honeycomb
), with the height change at position, this variation has microwave and the honeycomb wall that is coated with graphene microwave absorbing coating more for honeycomb cross section
More crosses, and generates more losses.The present invention one completely new three-dimensional microwave absorbing material of offer designs and prepares technique,
Solve the problems, such as the low and high incidence angle degraded performance problem of the cellular high frequency performance of heavy caliber；According to application demand design optimization
Suction wave honeycomb, microwave absorbing coating can by by method for printing substrate surface apply, can also by dipping, face into
Penetrating the cellular opening face in direction can be plane, be also possible to pointed cone and wedge to realize that optimum impedance matches.
In the present invention, the raw material for preparing graphene is high-specific surface area graphite worm, the nothing that graphite worm can be bought to resell with city
Sulphur can swollen graphite obtained by 600 DEG C or more high temperature puffings, the specific surface area of high-specific surface area worm is higher than 60m2/ g, with it is molten
After the mixing such as agent, resin, additive, graphene conductive coating, every point of rotation speed is made after high shear rotary dispersion removing
Clock is greater than 3000 turns, is preferably greater than 5000 turns per minute.The granularity of graphene conductive coating is tested by laser particle analyzer, d50
Less than 15 μm, preferred d50Less than 12 μm.The sheet resistance of graphene conductive coating is according to coating layer thickness and graphene content
Adjustable between 10~1000 Ω/sq, preferred scope is in 30-600 Ω/sq.
A kind of preparation method of ultra-wide incidence angle microwave absorbing material, comprising the following steps:
S1. the design and selection for optimizing special-shaped honeycomb using electromagnetic simulation software, select the honeycomb of flexible parent metal and product
Structure feature；
S2. the sheet resistance distribution of design is formed on flexible parent metal using method for printing printing graphene conductive coating；
S3. with node glue sticking and stretch that preparation is designed to tilt special-shaped honeycomb, tilt special-shaped honeycomb inclination angle from 0~
60°。
Preferably, the equivalent surface resistance of its film of graphene conductive coating is 10~1000 Ω/sq.
It is suitble to its equivalent face resistance range of graphene conductive coating of the invention in 10~1000 Ω/sq, more preferably range
In 30~300 Ω/sq.
Preferably, step S3 can also be impregnated or be sprayed on its surface after preparing the special-shaped honeycomb of designed inclination
Coating colour decorates protective coating.
Preferably, the process of step S3 is specifically, with glue spreader by design coating node glue, heating on flexible parent metal
Dry solvent, which reaches touching, to be done, and shearing to required length is superimposed flexible parent metal to the required number of plies or thickness by design arrangement, obtains base
Material block, then with high temperature press or in vacuum bag, heating in vacuum substrate block solidifies node glue, pulls open substrate block shape with stretching-machine
At honeycomb structure and fixation.
Preferably, the process of step S3 specifically: with glue spreader by design coating node glue, heating on flexible parent metal
Dry solvent, which reaches touching, to be done, and shearing to required length is superimposed flexible parent metal to the required number of plies or thickness by design arrangement, obtains base
Material block, then with high temperature press or in vacuum bag, heating in vacuum substrate block solidifies node glue, is with a chainsaw cut into honeycomb surface
Wedge shape is tilted, then substrate block is pulled open with stretching-machine and forms honeycomb structure and fixation.
In step S1, the design of oblique angle abnormity honeycomb is using the micro- of electromagnetic simulation software optimised shape and antiradar coatings
Wave electromagnetic performance, coating electromagnetic performance are compound dielectric and thickness or simple surface plural number sheet resistance.It is imitative by electromagnetism
The cellular design of true software optimization, is the dielectric constant or sheet resistivity conductive coat, cell dimensions and shape, material shape
Electromagnetism calculating is carried out with thickness, etc. input computer program and optimization, the program can be business software and self-compiling program, often
The business software seen such as HFSS, FDTD, CST, MOM etc. can be used for electromagnetism calculating, can also self-editing dedicated program, more effectively
It realizes design rapid Optimum, equity of the invention can't be changed using different software.Arrange optimum results discovery of the invention:
Compared with conductive black, metal powder, graphite powder and other conductive powder bodies, graphene is more preferable as the effect of conductive additive,
The high frequency of 5GHz or more needs not exceed 2cm(side length 1cm with cell dimensions), 1GHz cell dimensions are ultra-thin to set in 6cm or so
Meter needs lesser honeycomb such as 0.5cm, if (so-called straight-through honeycomb from top to bottom) is designed using normal cellular, when wavelength is small
When crossing honeycomb internal diameter, absorbing property rapid decrease, by special-shaped cell layout, high frequency (short wavelength) inhales wave can be from by frequency
Microwave height moves to millimeter wave.For high incidence angle demand, performance is best when cellular inclination angle is close with incidence angle.Performance requirement
Determine that its minimum honeycomb thickness, the coating resistance distribution of honeycomb inclination angle and honeycomb inner wall and honeycomb thickness determine the frequency absorbed
It responds and to incidence angle susceptibility.The present invention can design the cellular application frequency of production from 0.01~110GHz, and bandwidth is any
It is optional.Optimized incidence can be from normal incidence to 60 °.As long as the shape of honeycomb meets productibility, such as regular hexagon, non-
Regular hexagon, square, rectangle and waveform etc., and similar honeycomb, such as i.e. two groups are equally equidistantly slotted two
/ mono- or more paper is mutually perpendicular to the quadrilateral structure that insertion is formed.
It tilts special-shaped honeycomb and refers to that its section position, width and angle for dispensing glue can bases when preparing honeycomb
Design is in the different honeycomb alternations of cross-section, and as simplest design, section faying face for dispensing glue is being arranged at honeycomb top, in bottom
There is no node glue, vice versa.High-frequency microwave can not be arrived without impedance by honeycomb in this way under any incident angle
Up to bottom.This design can be repeated in a honeycomb and uses more complicated design, as long as honeycomb is being made
Meet stretchable demand during standby.
The process of step S2 are as follows: various method for printing can be used, often in the printing in substrate surface of graphene conductive coating
The method for printing seen has a silk screen, ink-jet, intaglio plate, relief printing plate, etc., and it is two-sided that full-automatic and manual process, full-automatic technique can be used
The production efficiency of printing is high, is suitble to mass production.It is suitble to its equivalent face resistance range of graphene conductive coating of the invention
In 10~1000 Ω/sq, more preferably range is in 30~300 Ω/sq.After printing according to the condition of cure of graphene conductive coating into
Row drying at room temperature and elevated cure.
The process of step S3 are as follows: node glue is applied on flexible parent metal with glue spreader, heat drying solvent, which reaches touching, to be done, and is cut
It is switched to required length, by design arrangement flexible parent metal to required thickness, substrate block is obtained, then uses high temperature press or vacuum press
Heated substrate block solidifies node glue, and solidification temperature is determined according to the solidifying requirements of glue, and common node glue is phenolic aldehyde series, Gu
Changing temperature is 180 DEG C, 30 minutes.Then wedge shape is cut into according to the design of the shape on honeycomb surface with a chainsaw.
After step s 3, the designed surface dipping for tilting special-shaped honeycomb or spraying face can also prepared
Color decorates protective coating, while increasing the brightness or camouflage color of absorbing material use environment, is used without water-fast painting for interior
Layer.Wherein color decoration protective coating can be using raw materials such as aqueous latex paint, water-base epoxy and aqueous polyurethanes.
Therefore, the invention has the following advantages: the ultra-wide incidence angle microwave absorbing material in the present invention inhales wave frequency rate
From millimeter wave to metric wave, incidence angle is from normal incidence to high incidence angle, while the material has low cost, technique and product environmental protection,
High mechanical strength, density is low, and the service life is long, high temperature resistant and it is fire-retardant the advantages that, solve the low property of non-structural foam wave-suction material
Can, volume is big, it is not necessary that mechanical strength, weight weight, the service life is short, poor heat resistance, is not suitable for open air use, not environmentally etc.
Various disadvantages；The honeycomb of the ultra-wide incidence angle microwave absorbing material in the present invention can shrink collection and save simultaneously, have
It opens and uses when necessary, when can reduce transportation cost and collection space, especially outdoor application, opening when need to only test has
Conducive to the construction and use in secrecy test outfield.
Detailed description of the invention
Fig. 1 is the reflectivity of oblique incidence and the reflection schematic diagram of absorbing material；
Fig. 2~Fig. 5 is that cellular production schematic diagram and common section are tilted in ultra-wide incidence angle microwave absorbing material of the present invention
Dispensing applies shape；
Fig. 6~Fig. 9 is that the cellular part of nodes glue coating shape of abnormity is tilted in ultra-wide incidence angle microwave absorbing material of the present invention
With honeycomb schematic cross-section；
Figure 10 is that the inclination pointed cone impregnated in ultra-wide incidence angle microwave absorbing material of the present invention inhales wave honeycomb；
Figure 11 is that the inclination sharp conical shape that honeycomb inner surface is printed in ultra-wide incidence angle microwave absorbing material of the present invention inhales wave ink
Pattern.
Specific embodiment
Further description of the technical solution of the present invention With reference to embodiment.
Obviously, the described embodiments are merely a part of the embodiments of the present invention, instead of all the embodiments.Based on this
Embodiment in invention, all other reality obtained by those of ordinary skill in the art without making creative efforts
Example is applied, shall fall within the protection scope of the present invention.
In the present invention, if not refering in particular to, all equipment and raw material is commercially available or the industry is common,
Method in following embodiments is unless otherwise instructed conventional method in that art.
Tilt the production method of honeycomb:
As shown in Fig. 2, 1 by design coating node glue 2 on flexible parent metal, it is coated with after section multi-layer substrate staggered superposition for dispensing glue
Substrate block is solidified under high temperature pressure, substrate block becomes honeycomb, level of stretch and gluing and no glue length ratio after pulling open
Determine the shape in honeycomb section, such as hexagon (Fig. 3) and waveform (Fig. 4).It can also be as shown in Figure 5 with another work
Skill produces the three-dimensional structure of quadrangle, i.e., paper more than two groups halfs of equally equidistantly slotting is mutually inserted, should make at this time
With foam glue bonding cross spider to increase intensity.
Save printing for dispensing glue:
Dark color represents node glue in Fig. 6-Fig. 9, different from Fig. 2, and Fig. 6-Fig. 9 shows different section coating shapes for dispensing glue, node glue
Inclination angle according to design determine.Incident high-frequency microwave passes through honeycomb wall for 1 time in the design of Fig. 6 and Fig. 7, and Fig. 8 is set
There is 2 times highest in meter passes through honeycomb wall.Fig. 9 is waveform honeycomb figure.Silk screen, relief printing plate or intaglio plate continuous printing can be used
Node glue.Cryogenic applications can be used with the node glue of starch series, high temperature uses phenolic resin node glue, high temperature application
Organosilicon or bismaleimide resin node can be used.
After the flexible parent metal superposition solidification of Figure 10 is stretched, the honeycomb of platform shape can be obtained.
Wave honeycomb is inhaled in 180 DEG C of long-time services of embodiment 1:140mm high
The present embodiment is 80g/m using surface density2Nomex paper (promise U.S. paper) be used as substrate, need 25m2Fire-retardant Nomex paper
Produce 1 m2Suction wave cellular material, weight about 2.5kg, the wide 0.9m of paper web, produce side length 0.55cm(node glue width)
Non- equilateral 6 side shape honeycomb saves shape for dispensing glue as shown in Fig. 2, tilt angle is 45 ° using phenolic resin node glue.Superposition adds
Then piece is cut into 14cm high to the monolith substrate block of pressing chemical conversion 0.9m high, and 7cm depth wedge is then cut into honeycomb side with a chainsaw.
Then it stretches to be fixed on bracket and obtains the long 2.5m of honeycomb, wide 1.2m, high 0.14m.
Graphene conductive formulation for coating material: (graphite worm that 900oC expands 450 times is raw material, specific surface area to graphene
65m2/ g) 6.0%, acetylene carbon black 2%, epoxy modified phenolic resin 40%, levelling agent 2%, butyl glycol ether 50%.High speed dispersion,
Graphene coating, d are obtained after 9000rpm removing50For granularity less than 12 microns, graphene draw ratio is 550.
The honeycomb being fixed on bracket is opened into stretching, is all immersed in graphene coatings tank 1 minute, taking-up is placed on
0.5 hour of aeration-drying on metal mesh bracket solidifies 30 minutes (figures after 100oC low temperature primary solidification 30 minutes, 180 DEG C
10).Use the organosilicon coating of light color system as decoration protective coating.
The surface density of this product about 4kg/ m2, 7.0GHz is with 60 ° of incident reflectivity up to 60GHz less than negative 40dB.
The continuous use temperature of this product is 180 DEG C, and the short time uses temperature 200oC, and under the conditions of forced ventilation, power density is not small
In 10000 watts/m2.It can fold before assembling, volume is only 15% stretched when opening, when greatly reducing transport and storing
Volume.
Wave honeycomb is inhaled in 120 DEG C of long-time services of embodiment 2:600mm high
The present embodiment is 180g/m using surface density2Brown paper needs 38 m as substrate2Fire-retardant brown paper produce 1 m2's
Inhale wave cellular material, weight about 7.2kg, the wide 1.3m of paper web.Inclination as shown in figure 11 is printed with silk screening first on paper
Pointed cone conductive pattern, height 0.6m, pointed cone width 4.5cm, inclination anglei=30 °, pointed cone length is the half of height, then
Solidify 30 minutes at 180 °C.Produce side length 1.5cm(node glue width) and 3cm(node glue spacing) non-equilateral 6 side shape bee
Nest saves shape for dispensing glue such as Fig. 7 using silk screen continuous printing node glue using phenolic aldehyde node glue), node offset printing brush inclination angle
30o, every section of height 26cm, the distance between two sections of node glue 9cm, the horizontal displacement 2.25cm of upper lower node glue, while printing 2
The node glue of a honeycomb, superposition cure under pressure piece are cut into the monolith substrate block of 2 pieces of an equal amount of each 0.6m high, then draw
It stretches to be fixed on bracket and obtains the long 2.5m of honeycomb, wide 1.2m, high 0.6m.
Graphene conductive formulation for coating material: (graphite worm that 700oC expands 400 times is raw material to graphene, and specific surface area is
61m2/ g) 7%, acetylene carbon black 3%, phenol-formaldehyde resin modified 40%, levelling agent 2%, butyl glycol ether 48%.High speed dispersion, 8000rpm
Graphene coating, d are obtained after removing50For granularity less than 12 microns, graphene draw ratio is 500.
The honeycomb being fixed on bracket is opened into stretching, is all immersed in graphene coatings tank 2 minutes, taking-up is placed on
1 hour of aeration-drying on metal mesh bracket solidifies 1 hour after 80oC low temperature primary solidification 45 minutes, 180 DEG C.Using light
The aqueous polyurethane coating of colour system is as decoration protective coating.
The surface density of this product about 10.5kg/ m2, be 50%, 1GHz of equal performance pointed cone absorbing material with up to
60 ° of oblique-incldence reflectivities of 40GHz are less than negative 40dB, and continuous use temperature is 120 DEG C, in the case that ventilation condition is good, power
Density is 1000 watts/m2.After surface carries out stiffened skin processing, general operation personnel can stand upon that (local compressive strength is big
In 2kg every square centimeter, about 100 square centimeters of single sole area, so ordinary person can walk about on it).It before assembling can be with
It folds, volume is only 15% stretched when opening, greatly reduces volume when transport and storage.
120 DEG C of low frequencies of embodiment 3:1200mm high inhale wave honeycomb
The present embodiment uses surface density 180g/ m2Brown paper needs 48 m as substrate2Brown paper produces 1 m2Suction wave honeycomb
Material, weight about 8.7kg, the wide 1.3m of paper web, produce side length 2.5cm(node glue width) and 5cm(node glue spacing) it is non-
Equilateral 6 side shape honeycomb, inclination angle are 30 °, using phenolic aldehyde node glue, save shape for dispensing glue such as Fig. 7), every section of height 32cm, two sections
The distance between node glue 12cm, upper and middle section horizontal displacement 3.75cm for dispensing glue, upper lower node glue alignment, after being superimposed cure under pressure
Piece is cut into the monolith substrate block of 1.2m high, and then stretching, which is fixed on bracket, obtains the long 2.5m of honeycomb, wide 1.2m, high 1.2m.
Graphene conductive formulation for coating material: (graphite worm that 700oC expands 400 times is raw material to graphene, and specific surface area is
61m2/ g) 7.5%, acetylene carbon black 3%, phenol-formaldehyde resin modified 40%, levelling agent 2%, butyl glycol ether 47.5%.High speed dispersion,
Graphene coating, d are obtained after 8000rpm removing50For granularity less than 12 microns, graphene draw ratio is 500.
The honeycomb being fixed on bracket is opened into stretching, is all immersed in graphene coatings tank 2 minutes, taking-up is placed on
2 hours of aeration-drying on metal mesh bracket, 1 hour of 80oC low temperature primary solidification solidify 2 hours after 180 DEG C.Using light
The aqueous polyurethane coating of colour system is as decoration protective coating.
The surface density of this product about 14kg/ m2, it is 40%, the 0.1-0.2GHz inclination of equal performance pointed cone absorbing material
60 ° of incident reflectivity are less than negative 30dB, and 60 ° of the inclination incident reflectivity of 0.2GHz ~ 40GHz are less than negative 40dB.The company of this product
Continuing using temperature is 120 DEG C, in the case that ventilation condition is good, and power density is 800W/ m2.It can fold before assembling, volume
15% when opening only is stretched, volume when transport and storage is greatly reduced.
Wave honeycomb is inhaled in 180 DEG C of long-time services of embodiment 4:100mm high
The present embodiment is 50g/m using surface density2Nomex paper (promise U.S. paper) be used as substrate, need 18 m2Fire-retardant Nomex
Paper produces 1 m2Suction wave cellular material, weight about 0.95kg, the wide 0.9m of paper web, produce side length 0.8cm(node glue width)
With 1.5cm(node glue spacing) non-equilateral 6 side shape honeycomb, shape for dispensing glue is saved using organosilicon node glue in 30 ° of inclination angle
Such as Fig. 6), every section of 6 cm of height, the distance between two sections of node glue 3 cm, the horizontal displacement 0.75cm of upper lower node glue, superposition
Cure under pressure at 0.9m high monolith substrate block then piece be cut into 15cm high, then stretch be fixed on bracket obtain honeycomb it is long
2.5m, wide 1.2m, high 0.15m.
Graphene conductive formulation for coating material: graphene (graphite worm that 900oC expands 450 times is raw material) 6.0%, acetylene charcoal
Black 2%, organic siliconresin 40%, levelling agent 2%, dimethylbenzene 50%.Graphene coating, d are obtained after high speed dispersion, 9000rpm removing50
For granularity less than 11 microns, graphene draw ratio is 550.
The honeycomb being fixed on bracket is opened into stretching, is all immersed in graphene coatings tank 1 minute, taking-up is placed on
0.5 hour of aeration-drying on metal mesh bracket solidifies 1 hour after 100oC low temperature primary solidification 30 minutes, 220 DEG C.It uses
The organosilicon coating of light color system is as decoration protective coating.
The surface density of this product about 2.5kg/ m2, compressive strength is greater than 1.5MPa, and 6.0GHz is with inclining up to 60GHz
Oblique 60 ° incident reflectivity are less than negative 40dB.The continuous use temperature of this product is 180 DEG C, and the short time uses temperature 220oC,
Under the conditions of forced ventilation, power density is not less than 3000 watts/m2.It can fold before assembling, volume is only to stretch when opening
15%, greatly reduce volume when transport and storage.
It should be understood that those skilled in the art, can be improved or be become according to the above description
It changes, and all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (10)
1. a kind of ultra-wide incidence angle microwave absorbing material, it is characterised in that: it is as the special-shaped honeycomb of the inclination as made from flexible parent metal
The graphene conductive coating composition applied in structure and flexible parent metal.
2. a kind of ultra-wide incidence angle microwave absorbing material according to claim 1, it is characterised in that:
The graphene conductive coating is made of graphene, adhesive and solvent, and viscosity is 100~3000mPas, institute
The content for stating graphene is 1~40wt%, and the content of described adhesive is 10~60wt%, the content of the solvent is 0~
60wt%；The carbon content of the graphene conductive coating is higher than 97%, and draw ratio is greater than 500.
3. a kind of ultra-wide incidence angle microwave absorbing material according to claim 2, it is characterised in that:
It further include the conductive black of 3~20wt% in the graphene conductive coating.
4. a kind of ultra-wide incidence angle microwave absorbing material according to claim 2, it is characterised in that:
The graphene is as sulfur-free expandable graphite through graphite worm made from 600~900 DEG C of high-temperature expansions, specific surface
Product is greater than 60g/m2。
5. a kind of ultra-wide incidence angle microwave absorbing material according to claim 1, it is characterised in that:
The cellular inclination angle of the inclination abnormity is 0~60 °.
6. a kind of preparation method of ultra-wide incidence angle microwave absorbing material according to claim 1, it is characterised in that including
Following steps:
S1. the design and selection for optimizing special-shaped honeycomb using electromagnetic simulation software, select the honeycomb of flexible parent metal and product
Structure feature；
S2. the sheet resistance distribution of design is formed on flexible parent metal using method for printing printing graphene conductive coating；
S3. with node glue sticking and stretch that preparation is designed to tilt special-shaped honeycomb, tilt special-shaped honeycomb inclination angle from 0~
60°。
7. a kind of preparation method of ultra-wide incidence angle microwave absorbing material according to claim 6, it is characterised in that:
The equivalent surface resistance of described its film of graphene conductive coating is 10~1000 Ω/sq.
8. a kind of preparation method of ultra-wide incidence angle microwave absorbing material according to claim 6, it is characterised in that:
The step S3 can also impregnate on its surface after preparing the special-shaped honeycomb of designed inclination or paint color dress
Adorn protective coating.
9. a kind of preparation method of ultra-wide incidence angle microwave absorbing material according to claim 6, it is characterised in that:
The process of the step S3 is specifically, with glue spreader by design coating node glue, heat drying solvent on flexible parent metal
It is dry to reach touching, shearing to required length obtains substrate block, so by design arrangement superposition flexible parent metal to the required number of plies or thickness
With high temperature press or in vacuum bag, heating in vacuum substrate block solidifies node glue afterwards, pulls open substrate block with stretching-machine and forms honeycomb
Structure and fixation.
10. a kind of preparation method of ultra-wide incidence angle microwave absorbing material according to claim 6, it is characterised in that:
The process of the step S3 specifically: with glue spreader by design coating node glue, heat drying solvent on flexible parent metal
It is dry to reach touching, shearing to required length obtains substrate block, so by design arrangement superposition flexible parent metal to the required number of plies or thickness
With high temperature press or in vacuum bag, heating in vacuum substrate block solidifies node glue afterwards, and inclination wedge is cut on honeycomb surface with a chainsaw
Then shape pulls open substrate block with stretching-machine and forms honeycomb structure and fixation.
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Application publication date: 20181207 |