CN110257006A - A kind of microwave absorbing material and preparation method thereof - Google Patents
A kind of microwave absorbing material and preparation method thereof Download PDFInfo
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- CN110257006A CN110257006A CN201711282927.9A CN201711282927A CN110257006A CN 110257006 A CN110257006 A CN 110257006A CN 201711282927 A CN201711282927 A CN 201711282927A CN 110257006 A CN110257006 A CN 110257006A
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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
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
- D21H19/24—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
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Abstract
The invention discloses a kind of microwave absorbing material, which is the special-shaped honeycomb being prepared by flexible material, and surface is impregnated with graphene conductive coating, passes through the shape of Electromagnetic Simulation optimal control microwave absorbing material and the performance of graphene conductive coating.When preparing above-mentioned microwave absorbing material, selection and design are carried out first with electromagnetic simulation software, the special-shaped honeycomb designed by node gluing knot and stretching preparation again, produces graphene conductive coating with physics stripping method, final impregnating material is to achieve the purpose that dipping.Microwave absorbing material of the invention is at low cost, and technique and product environmental protection, density is low, and the service life is long, and absorption frequency is wide, and commercial value is higher.
Description
Technical field
The invention belongs to microwave absorbing material fields, and in particular to a kind of microwave absorbing material and preparation method thereof.
Background technique
Realize that high microwave reflection absorption must satisfy two conditions in a limited space, i.e., with the impedance matching of free space
With the phase matched of the incidence wave and back wave inhaled within the scope of wave, the electromagnetic consumable absorbing material of microwave dark room is mainly using immersion
Cross the non-structural type polyurethane foam of the conductive carbon black coating of dielectric type electromagnetic consumable material, fine sharp conical shape be full
The grading profile that foot is matched with the Microwave Impedance of free space and done designs.Due to polyurethane foam it is heat-resisting, environment resistant compared with
Difference, rigidity are low, it is difficult to and it is competent at high-power application, will appear curved under cone, phenomena such as carbon dust falls off in use for some time,
Especially low frequency absorbing material, since its height is up to 1 meter or more, the deformation in use is obvious, therefore service life has very much
Limit.The glass pointed cone honeycomb of conductive coating coating has been used in high power darkroom, however since honeycomb cost of material is high and processing
Its cost of complex process can not be compared with polyurethane foam, and Design Mechanism is identical as pointed cone absorbing material, so cannot achieve
Ultra-wideband absorbs.Early stage, although cheap, performance could once using the absorbing material of Soviet Union's exploitation being rolled into using conductive paper
Receive, but the service life is short, inconvenient for use, as carbon dust completely, use polyphenyl alkene foam as core also unbearable high power microwave,
Therefore domestic several darkrooms are burnt, the service life, general hardly possible was more than 15 years.Magnetic electromagnetic consumable ferrite wave-absorbing material is for being lower than
The low frequency of 1GHz inhales wave, but absorbent properties only have 15 to 30dB, every m2Weight is probably in 30kg, due to complex process, cost
Also very expensive.It, can be by the duty of low-frequency wave-absorbing material at present by the thick such ferrite watt of 6mm as the substrate for inhaling wave wedge
Volume is reduced to 30% or so, but darkroom weight greatly increases, and need to reinforce building structure, and consequent is Gao Chengben.
As structural wave-absorbing material core material, electromagnetic consumable conductive coating is usually coated in Nomex (meta-aramid) honeycomb
Inner surface can also strengthen the foam of polyurethane foam absorbing material rigidity flexible, cost naturally also answering with technique
Hydridization and increase.Generally speaking, existing wideband microwave absorbing material system is more than that the improvement of nearly half a century develops, design
There is no revolutionary progress with production technology, are still at high cost, long in time limit, and no design optimization, low-and high-frequency performance is poor, resistance to
High temperature and poor fire, mechanical strength is low, and the service life is short etc., faces various disadvantages and is unable to satisfy the fast of the test of wireless telecommunications in recent years
Speed development.
Inexpensive cellular material applies node adhesive curing post-tensioning using flexible paper, film or cloth, in specific position, leads to
Cross impregnating resin solidifying and setting.The intensity of cellular material is significantly larger than the light materials such as foam, compresses under same density strong
Degree is one times of foam, and production technology is perfect, and with different paper, cloth, glass-fiber-fabric is north to expect that thin slice etc. produce honeycomb material
Material.Honeycomb section bore is bigger, and honeycomb is lighter, and cost is also lower.Low frequency heavy caliber, which inhales wave honeycomb, also disadvantage, high
Frequency absorbing property is lower, and especially the wavelength frequency that is less than bore, honeycomb become microwave waveguide, i.e. the wavelength can less loss
Across honeycomb.
Summary of the invention
The present invention provides a kind of microwave absorbing material, inhales wave frequency rate from millimeter wave to metric wave, can also be with by Electromagnetic Simulation
Realize that frequency selectivity inhales wave, while the material has low cost, technique and product environmental protection, high mechanical strength, density is low, the service life
It is long, high temperature resistant and it is fire-retardant the advantages that, solve the low performance of non-structural foam wave-suction material, volume is big, without required machine
Tool intensity, weight weight, the service life is short, poor heat resistance, not environmentally etc. various disadvantages.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of microwave absorbing material, the material are special-shaped honeycombs, and special-shaped honeycomb refers to the transversal of honeycomb
Face is non-constant (common honeycomb is the same in the cross section of any height, is constant), and honeycomb cross section is with position
Height change, this variation have microwave with the honeycomb wall for being coated with graphene microwave absorbing coating more to cross, generate and more damage
Consumption.
The present invention provides the technique that designs and prepares of a completely new three-dimensional microwave absorbing material, and innovation is impregnated using tradition
The sharp conical shape polyurethane foam of conductive carbon black coating is inhaled as the honeycomb of microwave absorbing material and existing coating conductive coating
Wave structure core material.Solve the problems, such as that the cellular high frequency performance of heavy caliber is low.
Preferably, the flexible parent metal is selected from paper, cloth, plastic film, flexible foam plate and is bonded by flexible material
Form the hard plate of folding structure, flexible parent metal with a thickness of 0.01 millimeter -20 millimeters.As long as flexible parent metal meets in life
Flexibility and intensity and and low weight under production. art and use condition.Further, flexible parent metal is fire-retardant ox-hide
Paper, aramid paper or glass-fiber-fabric, surface density 20-500g/m2。
The present invention also provides a kind of preparation methods of above-mentioned ultra-wideband absorbing material:
A kind of graphene abnormity inhales microwave absorbing material described in the cellular preparation of wave, and this method comprises the following steps:
1) design and selection for optimizing special-shaped honeycomb using electromagnetic simulation software, select the flexibility for producing product
The honeycomb feature of substrate and product；
2) special-shaped honeycomb is prepared by design；
3) by conductive coating of the design production based on graphene；
4) the graphene conductive coating dipping of special-shaped honeycomb,
5) dry solidification of graphene coating,
6) it impregnates or sprays light color and decorate protective coating.
In step 1), preferably, the design of special-shaped honeycomb using electromagnetic simulation software optimised shape and inhales wave painting
The Microwave electromagnetic properties of material, coating electromagnetic performance are compound dielectric and thickness or simple surface plural number sheet resistance.It is described
Optimize cellular design by electromagnetic simulation software, is dielectric constant or sheet resistivity conductive coat, cell dimensions and shape
Shape, material shape and thickness, etc. input computer program and carry out electromagnetism calculating and optimization, the program can be business software and
Self-compiling program, common business software such as HFSS, FDTD, CST, MOM etc. can be used for electromagnetism calculating, can also self-editing dedicated journey
Sequence is more effectively realized design rapid Optimum, can't be changed equity of the invention using different software.It arranges of the invention excellent
Change as a result, it has been found that: compared with conductive black, metal powder, graphite powder and other conductive powder bodies, nano-graphene adds as conduction
Add the effect of agent more preferable, the high frequency of 5GHz or more is needed not exceed 2cm (side length 1cm) with cell dimensions, 1GHz cell dimensions
In 6cm or so, ultrathin design needs lesser honeycomb such as 0.5cm, if using normal cellular design (so-called from top to bottom straight
Logical honeycomb), when wavelength is small crosses honeycomb internal diameter, absorbing property rapid decrease, by special-shaped cell layout, high frequency (short wavelength) is inhaled
Wave can move to millimeter wave from microwave height by frequency.Performance requirement determines its minimum honeycomb thickness, the coating electricity of honeycomb inner wall
Resistance distribution and honeycomb thickness determine the frequency response absorbed and to incidence angle susceptibilitys.Optimization the result is that meeting the requirements most
Thin (most short honeycomb) design and coating layer thickness or sheet resistivity and least cost.The present invention can design the cellular application of production
For frequency from 0.01 to 110GHz, bandwidth is arbitrarily optional.
In step 1), as long as the shape of the honeycomb meets productibility, such as regular hexagon, non-regular hexagon, just
It is rectangular, rectangle and waveform etc., and similar honeycomb, more than i.e. two groups halfs of equally equidistantly slotting
Paper is mutually perpendicular to the quadrilateral structure that insertion is formed.For its size from 0.3 centimetre to 20 centimetre, common size is 2 centimetres to 10
Centimetre, cell dimensions height is proportional to institute's absorbing wavelength and bandwidth.
Preferably, special-shaped honeycomb refers to that it saves position for dispensing glue when preparing honeycomb and width can basis
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 reach bottom by honeycomb without impedance in this way.In a honeycomb
Can be repeated in structure it is this design and use more complicated design, as long as honeycomb meet during the preparation process it is stretchable
Demand.
Preferably, the process of step 2) are as follows: apply node glue on flexible parent metal with glue spreader, heat drying solvent reaches
Dry to touching, shearing to required length obtains substrate block, then uses high temperature press by design arrangement flexible parent metal to required thickness
Or vacuum press heated substrate block solidifies node glue, pulls open substrate block formation honeycomb structure with stretching-machine after solidification and is fixed on
Impregnated graphite alkene conductive coating on frame is detached to obtain absorbing material from frame after dry solidification.
Preferably, the process of step 3) are as follows: prepare graphene conductive coating, main component is by graphene powder, bonding
Agent and solvent composition, graphene account for the 1%-40% of total weight.It can also be with hybrid conductive carbon black to reach optimum performance, weight
Than for 3-20%.Any adhesive can be used in the present invention, can be high-molecular organic material and inorganic material and ceramics
Precursor, formula in usage amount from 10% to 60%.Solvent is according to viscous to adjust productibility and craftsmanship, selection
The type of mixture, formula in usage amount from 0% to 60%, various auxiliary agents also can be used to change craftsmanship etc., such as
Levelling agent, dispersing agent etc..
It is high-specific surface area graphite worm, the nothing that graphite worm can use city to buy to resell as raw material that is preferred, preparing graphene
Sulphur can swollen graphite obtained by 600 DEG C or more high temperature puffings, after being mixed with solvent, resin, additive etc., through high shear rotary
Graphene conductive coating is made after dispersion removing, rotation speed is greater than 3000 turns per minute, is preferably greater than 5000 turns per minute.
The sheet resistance of conductive coating is adjustable between 10~1000 Ω/sq according to coating layer thickness and graphene content, and preferred scope exists
50-600Ω/sq。
Preferably, the process of step 4) are as follows: design the honeycomb being fixed on frame after stretching according to Electromagnetic Simulation, soak
Stain is taken out after 1~3 minute in the slot of graphene conductive coating, dry in ventilation, drying time and temperature and solvent boiling point
Related, temperature higher boiling is low, fast drying.The viscosity of conductive coating is 100~1000mPas, and viscosity is higher, honeycomb surface
Residual paint is more, and sheet resistance is lower.It, can be using repeatedly dipping or different height in order to realize the electromagnetic design of optimization
Dipping and different graphene paint formulation dipping, to meet required electromagnetic performance, under can entering after solvent seasoning
Secondary dipping.
Preferably, the process of step 5) are as follows: solidification is dried in the honeycomb being fixed on frame after dipping, is being divulged information
After locating solvent seasoning, different conditions of cure is used according to resin system, low-temperature setting uses 60~80 DEG C of solidification temperature, high
Temperature solidification using two sections of solidifications, i.e. low temperature primary solidification and high temperature post cures, cured temperature at the beginning of low temperature at 80~100 DEG C, Gu
Change hour 15 minutes to 4 time, the temperature of high temperature post cure is between 150~250 DEG C, and curing time same 15 minutes to 4
A hour.
Preferably, the process of step 6) are as follows: the suction wave cellular material after solidifying graphene coating dipping impregnates or spray
The protective coating for applying light color, while increasing the brightness of absorbing material use environment, for the honeycomb used as interlayer structure, one
As do not need protective coating, waterproof coating is used without for interior, preferably, water-base epoxy and aqueous polyurethane are rings
Friendly coating.
The flexible parent metal is fire-retardant brown paper, surface density 180g/m2.Honeycomb side length is 1~5cm.The graphite
The adhesive of alkene conductive coating is phenol-formaldehyde resin modified, graphene average aspect ratio 500, carbon content 98%, graphene quality point
Number 7%, acetylene carbon black mass fraction 1~5%, the mass fraction of solvent ethylene glycol butyl ether are 45~50%, polyacrylic acid levelling
The mass fraction of agent is 2%, remaining is resin solution.Cost is relatively low for the microwave absorbing material of technical solution preparation, and effect is excellent
It is good.
Detailed description of the invention
Fig. 1-Fig. 5 is cellular production schematic diagram and common node glue coating shape；
Fig. 6-Figure 14 is the cellular part of nodes glue coating shape of abnormity and honeycomb schematic cross-section；
Specific embodiment
Below by specific embodiment, technical scheme of the present invention will be further explained in detail.It should be appreciated that this hair
Bright implementation is not limited by the following examples, and the accommodation in any form made to the present invention and/or changed will all be fallen
Enter the scope of the present invention.
In the present invention, if not refering in particular to, all parts, percentage are unit of weight, used equipment and raw material etc.
It is commercially available or commonly used in the art.Method in following embodiments is unless otherwise instructed the normal of this field
Rule method.
The production method of honeycomb:
As shown in Figure 1, being coated with section multi-layer substrate staggered superposition for dispensing glue 1 by design coating node glue 2 on flexible parent metal
It is solidified under high temperature pressure afterwards substrate block (Fig. 2), substrate block becomes honeycomb, level of stretch and gluing and nothing after pulling open
Shape of the glue length than determining honeycomb section, such as regular hexagon (Fig. 3) and waveform (Fig. 4).It can also use as shown in Figure 5
Another technique produces the three-dimensional structure of quadrangle, i.e., paper more than two groups halfs of equally equidistantly slotting is mutually perpendicular to
Insertion should bond cross spider using foam glue at this time to increase intensity.
Save printing for dispensing glue:
Dark color represents node glue in Fig. 6-Figure 10, different from Fig. 1, and Fig. 6-Figure 10 shows different section coating shapes for dispensing glue,
Inclination angle for dispensing glue is saved less than 20 °, the honeycomb otherwise prepared is more difficult to be pulled open.Vertical incidence high-frequency microwave design drawing 6, Fig. 7 and
In Fig. 9 highest have 2 times pass through honeycomb wall, and in Fig. 8 then 1 time pass through honeycomb wall, Figure 10 be repeatedly pass through honeycomb wall.It can use
Silk screen, relief printing plate or intaglio plate continuous printing node glue.Cryogenic applications can be used with the node glue of starch series, high temperature uses
Phenolic resin node glue, high temperature application can use organosilicon or bismaleimide resin node glue, and Figure 11 and Figure 12 are respectively waveform
With the honeycomb figure of matrix pattern, Figure 13 is a kind of gluing embodiment of flexible parent metal, and dark color represents node glue, by the soft of Figure 13
Property substrate superposition solidification stretch after, the honeycomb (Figure 14) of platform shape can be obtained.
Wave honeycomb is inhaled in 120 DEG C of long-time services of embodiment 1:600mm high
The present embodiment is 180g/m using surface density2Brown paper needs 30m as substrate2Fire-retardant brown paper produce 1m2
Suction wave cellular material, weight about 5.5kg, the wide 1.3m of paper web.Produce side length 1.5cm (node glue width) and 3cm (node glue
Spacing) non-equilateral 6 side shape honeycomb using silk screen continuous printing node glue, save shape for dispensing glue as schemed using phenolic aldehyde node glue
B in 2), 12 ° of node offset printing brush inclination angle, every section of height 26cm, the distance between two sections of node glue 9cm, upper lower node glue
Horizontal displacement 2.25cm, while printing the node glue of 2 honeycombs, superposition cure under pressure piece be cut into 2 pieces it is an equal amount of each
The monolith substrate block of 0.6m high, then stretching, which is fixed on bracket, obtains the long 2.5m of honeycomb, wide 1.2m, high 0.6m.
Graphene conductive formulation for coating material: graphene (graphite worm of 700 DEG C of 400 times of expansions is raw material) 7%, acetylene carbon black
3%, phenol-formaldehyde resin modified 40%, levelling agent 2%, butyl glycol ether 48%.Graphene is obtained after high speed dispersion, 8000rpm removing
Coating, for Hegman fineness grind less than 20 μm, 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, 80 DEG C solidify 1 hour after 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 7.5kg/m2, it is 40%, 1GHz of equal performance pointed cone absorbing material up to 40GHz
Normal incidence reflectance rate be less than negative 40dB, continuous use temperature be 120 DEG C, in the case that ventilation condition is good, power density is
1000 watts/m2.Surface carry out stiffened skin processing after, general operation personnel can stand upon (local compressive strength be greater than often puts down
Square centimetre of 2kg, about 100 square centimeters of single sole area, so ordinary person can walk about on it).It can fold before assembling, body
Product is only 15% stretched when opening, greatly reduces volume when transport and storage.
120 DEG C of low frequencies of embodiment 2:1200mm high inhale wave honeycomb
The present embodiment uses surface density 180g/m2Brown paper needs 40m as substrate2Brown paper produces 1m2Suction wave bee
Nest material, weight about 7.2kg, the wide 1.3m of paper web, production side length 2.5cm (node glue width) and 5cm's (node glue spacing)
Non- equilateral 6 side shape honeycomb saves the d in shape for dispensing glue such as Fig. 2 using phenolic aldehyde node glue), every section of height 32cm, two sections of nodes
The distance between glue 12cm, upper and middle section horizontal displacement 3.75cm for dispensing glue, upper lower node glue alignment, piece is cut after being superimposed cure under pressure
At the monolith substrate block of 1.2m high, 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: graphene (graphite worm of 700 DEG C of 400 times of expansions is raw material) 7.5%, acetylene charcoal
Black 3%, phenol-formaldehyde resin modified 40%, levelling agent 2%, butyl glycol ether 47.5%.Stone is obtained after high speed dispersion, 8000rpm removing
Black alkene coating, for Hegman fineness grind less than 20 μm, 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 80 DEG C of low temperature primary solidifications 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 12kg/m2, it is that 40%, 0.1-0.2GHz of equal performance pointed cone absorbing material vertically enters
Reflectivity is penetrated less than negative 30dB, the Normal incidence reflectance rate of 0.2GHz~40GHz is less than negative 40dB.The continuous use temperature of this product
Degree is 120 DEG C, in the case that ventilation condition is good, power density 800W/m2.It can fold before assembling, volume is only to stretch
15% when opening, greatly reduce volume when transport and storage.
Wave honeycomb is inhaled in 180 DEG C of long-time services of embodiment 3:100mm high
The present embodiment is 50g/m using surface density2Nomex paper (promise U.S. paper) be used as substrate, need 15m2It is fire-retardant
Nomex paper produces 1m2Suction wave cellular material, weight about 0.8kg, the wide 0.9m of paper web, production side length 0.7cm (node glue is wide
Degree) and the non-equilateral 6 side shape honeycomb of 1.5cm (node glue spacing) saved in shape for dispensing glue such as Fig. 2 using organosilicon node glue
C), every section of height 4.3cm, the distance between two sections of node glue 1.4cm, the horizontal displacement 1.05cm of upper lower node glue, superposition
Cure under pressure at 0.9m high monolith substrate block then piece be cut into 10cm high, then stretch be fixed on bracket obtain honeycomb it is long
2.5m, wide 1.2m, high 0.1m.
Graphene conductive formulation for coating material: graphene (graphite worm of 900 DEG C of 450 times of expansions is raw material) 6.0%, acetylene charcoal
Black 2%, organic siliconresin 40%, levelling agent 2%, dimethylbenzene 50%.Graphene coating is obtained after high speed dispersion, 9000rpm removing,
For its Hegman fineness grind less than 20 μm, 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, 100 DEG C solidify 1 hour after 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 7.0GHz is up to the vertical of 60GHz
Incident reflectivity is less than negative 40dB.The continuous use temperature of this product is 180 DEG C, and the short time uses 220 DEG C of temperature, is forcing to lead to
Under the conditions of wind, power density is not less than 3000 watts/m2.It can fold before assembling, volume is only 15% stretched when opening, greatly
The big volume reduced when transporting and storing.
Above-mentioned embodiment is only a preferred solution of the present invention, not the present invention is made in any form
Limitation, there are also other variations and modifications on the premise of not exceeding the technical scheme recorded in the claims.
Claims (9)
1. a kind of microwave absorbing material, it is characterised in that: the microwave absorbing material is the special-shaped honeycomb that flexible parent metal is assembled into
Structure, and graphene conductive coating is covered on the microwave absorbing material.
2. microwave absorbing material according to claim 1, it is characterised in that: the flexible parent metal is that paper, cloth, plastics are thin
Film, flexible foam plate and one or more of the hard plate for forming folding structure is bonded together by the flexible parent metal, and
The flexible parent metal with a thickness of 0.01-20mm.
3. microwave absorbing material according to claim 2, it is characterised in that: the flexible parent metal is fire-retardant brown paper, virtue
One or more of synthetic fibre paper or glass-fiber-fabric, glass fiber paper, and the surface density of the flexible parent metal is 20-500g/m2。
4. microwave absorbing material according to claim 1, it is characterised in that: the carbon content of the graphene conductive coating is high
In 97%, and the draw ratio of the graphene conductive coating is greater than 500.
5. microwave absorbing material according to claim 1, it is characterised in that: the graphene conductive coating is by high-purity stone
Black alkene, adhesive and solvent form.
6. microwave absorbing material according to claim 5, it is characterised in that: the additive amount of the high purity graphite alkene is institute
State the 1%-40% of graphene conductive coating total weight.
7. preparing microwave absorbing material described in any one of claims 1-6, which comprises the steps of:
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. with node glue sticking and the designed special-shaped honeycomb of stretching preparation；
S3. physics stripping method produces graphene conductive coating；It is suitble to the equivalent surface resistance of its film of conductive coating of the present invention
Range is in 10-1000 Ω/sq；
S4. the sheet resistance distribution of design is formed using the different graphene conductive coating of one or many dippings.
8. the preparation method of microwave absorbing material according to claim 7, it is characterised in that: the process of step S2 are as follows: with painting
Glue machine is by design coating node glue on flexible parent metal, and heat drying solvent, which reaches touching, to be done, shearing to required length, by design row
Column superposition flexible parent metal obtains substrate block, then uses high temperature press or the heating in vacuum in vacuum bag to the required number of plies or thickness
Substrate block solidifies node glue, pulls open substrate block formation honeycomb structure with stretching-machine and is fixed on frame for graphene conductive
The dipping of coating.
9. the preparation method of microwave absorbing material according to claim 8, it is characterised in that: the flexible parent metal is fire-retardant ox
Mulberry paper, the adhesive of the graphite alkene coating are phenol-formaldehyde resin modified.
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| CN112821080A (en) * | 2021-01-04 | 2021-05-18 | 北京环境特性研究所 | Thin-layer filtering structure for transmitting waves in L frequency band |
| WO2023088094A1 (en) * | 2021-11-16 | 2023-05-25 | 深圳麦时科技有限公司 | Aerosol generating device |
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2017
- 2017-12-07 CN CN201711282927.9A patent/CN110257006A/en not_active Withdrawn
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111163624A (en) * | 2019-12-16 | 2020-05-15 | 西安安聚德纳米科技有限公司 | Arbitrary polarization microwave-dark-chamber wave-absorbing material and preparation method thereof |
| CN111163624B (en) * | 2019-12-16 | 2021-11-09 | 西安安聚德纳米科技有限公司 | Arbitrary polarization microwave-dark-chamber wave-absorbing material and preparation method thereof |
| CN112175224A (en) * | 2020-10-14 | 2021-01-05 | 泉州师范学院 | Method for improving stretching and folding resistance of FDM 3D printing TPU shoe material |
| CN112175224B (en) * | 2020-10-14 | 2022-10-14 | 泉州师范学院 | Method for improving stretching and folding resistance of FDM 3D printing TPU shoe material |
| CN112821080A (en) * | 2021-01-04 | 2021-05-18 | 北京环境特性研究所 | Thin-layer filtering structure for transmitting waves in L frequency band |
| WO2023088094A1 (en) * | 2021-11-16 | 2023-05-25 | 深圳麦时科技有限公司 | Aerosol generating device |
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Application publication date: 20190920 |