CN109788728A - A kind of lightweight inhales wave darkroom pointed cone material and preparation method thereof - Google Patents
A kind of lightweight inhales wave darkroom pointed cone material and preparation method thereof Download PDFInfo
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Abstract
The present invention relates to absorbing material technical fields, more particularly to a kind of lightweight inhales wave darkroom pointed cone material and preparation method thereof, the lightweight inhales wave darkroom pointed cone material and is equipped with graphene conductive coating with the honeycomb pointed cone structure formed, the honeycomb pointed cone body structure surface is assembled by flexible parent metal.Lightweight of the present invention inhales wave darkroom pointed cone material and assembles the honeycomb pointed cone structure to be formed by flexible parent metal, and graphene conductive coating is equipped in honeycomb pointed cone body structure surface, low cost, high mechanical strength, density are low, the service life is long, performance is good, it is saved convenient for shrinking collection, transportation cost and collection space are reduced, the construction and use in secrecy test outfield are conducive to；Preparation process high production efficiency, equipment cost is low, is suitble to mass production, arranges linkage between each technique, realizes the automation of whole production line.
Description
Technical field
The present invention relates to absorbing material technical fields more particularly to a kind of lightweight to inhale wave darkroom pointed cone material and its preparation side
Method.
Background technique
Existing suction wave darkroom pointed cone material mainly with polyurethane foam (sponge) dipping conductive black slurry based on, in reality
In the application of border, to improve its flame-retarding characteristic, usually realized by addition inorganic bond and inorganic fire retardants, such mode
The density for inhaling wave darkroom pointed cone material is caused to increase, when it needs to be suspended on perpendicular walls in use, can generate due to self weight
It is curved under deformation and pointed cone, the normal use of absorbing material is influenced, while high density, volume cause to inhale wave darkroom pointed cone material greatly
From great, it is unfavorable for outdoor use, use scope is limited.Further, since the operating temperature of polyurethane material itself is lower, lead to
Often be no more than 80 DEG C, at high temperature can softening transform, therefore, it is such inhale wave darkroom pointed cone material average receiving power be 1,000
Watt/m2Within.Absorbing material is one of the main construction cost for inhaling wave darkroom, and the service life of absorbing material becomes the darkroom service life
Restricting reason, the cost for replacing absorbing material is similarly high.
" a kind of honeycomb pyramid absorbing material and preparation method thereof based on graphene " is disclosed in Chinese patent literature,
Notification number is CN108441067A, and the graphene oxide which uses graphene oxide to be formulated with various ingredients is compound
Slurry is realized as coating materials, then by specific curing process, impregnation method by the electric property of graphene
The effect of strong electromagnetic wave absorption can be played in broad frequency range.But matrix density used in the invention is big, is not easy to transport
Defeated and storage is not easy to the construction and use in secrecy test outfield.
Summary of the invention
The present invention is based on non-structural foam that there is volumes is big, density is high to overcome tradition to inhale wave darkroom pointed cone material,
Mechanical strength is low, and the service life is short, poor heat resistance, be not suitable for open air use, be unfavorable for environmental protection problem, provide it is a kind of low cost,
The lightweight that high mechanical strength, density are low, the service life is long, performance is good inhales wave darkroom pointed cone material, saves, reduces convenient for shrinking collection
Transportation cost and collection space are conducive to the construction and use in secrecy test outfield.
The present invention also provides the preparation methods that a kind of lightweight inhales wave darkroom pointed cone material, and this method is environmentally protective, raw material
It is easy to get at low cost, process conditions are easily controllable, are advantageously implemented large-scale industrial production.
To achieve the goals above, the invention adopts the following technical scheme:
A kind of lightweight inhales wave darkroom pointed cone material, and the lightweight, which inhales wave darkroom pointed cone material and has to be assembled by flexible parent metal, to be formed
Honeycomb pointed cone structure, the honeycomb pointed cone body structure surface are equipped with graphene conductive coating.It is designed according to application demand optimal
The suction wave honeycomb of change can be plane in face of the cellular opening face of incident direction, be also possible to pointed cone and wedge to realize
Minimum thickness and optimum impedance matching, the cellular opening angle can be oblique angle and at any angle, the angle normally close to
Incidence angle.
The present invention selects flexible material as substrate, so that lightweight is inhaled wave darkroom pointed cone material and protected convenient for folding shrinking collection
It deposits, reduces transportation cost and collection space, be conducive to the construction and use in secrecy test outfield.Designed honeycomb pointed cone knot
Structure mechanical strength with higher, surface are equipped with graphene conductive coating and assign its long-life, and high power absorbing property can
Extend the darkroom service life, increase darkroom using range of microwave power and reduces use cost.
Preferably, the honeycomb pointed cone structure includes that several inhale wave honeycomb；The suction wave honeycomb be straight honeycomb or
Beveled tip splits honeycomb；The beveled tip splits cellular honeycomb angle less than 70 °.As long as the shape of honeycomb, which meets low cost, to give birth to
Production property, such as regular hexagon, non-regular hexagon, square, rectangle and waveform etc., and similar honeycomb, such as
Paper more than i.e. two groups halfs of equally equidistantly slotting is mutually perpendicular to the quadrilateral structure that insertion is formed.Its size is from 0.3
Centimetre to 20 centimetres, common size is 0.5 centimetre to 5 centimetres, cell dimensions height and institute's absorbing wavelength and bandwidth at than
Example.
Preferably, the flexible parent metal is paper, cloth, plastic film, flexible foam plate and is bonded by the flexible parent metal
Get up to form one or more of hard plate of folding structure；The flexible parent metal with a thickness of 0.01~5mm.
Preferably, the flexible parent metal is fire-retardant brown paper, in film, non-woven fabrics, aramid paper, glass-fiber-fabric, glass fiber paper
One or more；The surface density of the flexible parent metal is 20~500g/m2。
With honeycomb prepared by paper, 120 DEG C of long-term use temperature, the short time can achieve 150 DEG C, and the service life of paper can be light
Easily more than 20 years, with metal structure same longevity in darkroom or even longer.It is heat-resisting with the honeycomb that glass-fiber-fabric and inorganic bond form
Temperature is more than 450 DEG C, determines its heat-resisting upper limit by the heat resisting temperature of conductive wave absorbing agent, and it is more than 20,000 that power density, which may be implemented,
Watt/m2.Since honeycomb stiffness by itself is high, in addition to can be prepared into pointed cone and split cone, it can also be prepared into complicated shape,
Meet the efficient suction wave of high incidence angle and the reflection of darkroom corner.
Preferably, the equivalent face resistance range of the graphene conductive coating controls in 10~1000 Europe, preferably 50
~500 Europe.
A kind of lightweight inhales the preparation method of wave darkroom pointed cone material, comprising the following steps:
(1) design and selection for optimizing honeycomb pointed cone structure, determine flexible parent metal, electromagnetic parameter and structure feature；
(2) shaping glue, dry solidification are uniformly coated on flexible parent metal surface；The shaping glue is conductive suction wave sizing slurry or non-
Conduction inhales wave sizing slurry；The conductive wave sizing slurry of inhaling is graphene conductive slurry；
It (3), will be described through step (2) treated flexible parent metal by a pair of gear rolling corrugation that heats up according to design parameter
Design parameter includes the depth, angle and width of corrugation；The heating temperature for suppressing corrugation is greater than 80 DEG C；With interior having heaters and
Gear to rolling system or the hot press with corrugation mold suppresses corrugation substrate, corrugated shape, depth and width and week
Phase length is design parameter, these parameters are cellular design parameter.Depth and width are the side lengths on each side, and width is also
The width of contact surface, cycle length are the cellular period；
(4) by corrugation contact with each other face coating bonding glue, arrange to form honeycomb by design angle, hot-press solidifying obtains integration
Honeycomb；Node glue is applied on the contact surface of corrugation using double rod glue spreaders, the lower rod of double rod glue spreaders is immersed in glue groove
It is interior, glue is turned to be coated in corrugation contact surface (being glued node face), upper rolling, which then provides pressure, ensures that corrugation contact surface connects with lower rod
Touching；Corrugation arrangement superposition is obtained into honeycomb block by cell layout, is then carried out with the baking oven that can provide honeycomb block appropriate pressure
Be heating and curing node glue, solidification temperature and time determines according to the solidifying requirements of glue, and common node glue is phenolic aldehyde series,
Solidification temperature is 180 DEG C, 30min；
(5) integrated honeycomb is cut into pointed cone, obtains cone-shaped honeycomb；
(6) shaping glue used in step (2) be non-conductive suctions wave be formed slurry when, have honeycomb sharp for what step (5) obtained
The flexible parent metal of wimble structure impregnates or spraying graphite alkene electrocondution slurry, and dry solidification forms graphene conductive coating to get lightweight
Inhale wave darkroom pointed cone material；The shaping glue used in step (2) be it is conductive inhale wave be formed slurry when, omit the step；
(7) according to customer demand, spraying or dipping room temperature curing light color system coating.
Lightweight of the present invention inhales the graphene conductive coating of wave darkroom pointed cone material surface, both can be by being immersed in flexible base
The coating of material surface, impregnated graphite alkene electrocondution slurry after can also being shaped with honeycomb, a variety of molding modes.The invention proposes uses
Inexpensive preparation process, inexpensive cellular material pass through dipping/coating shaping glue and corrugation using flexible paper, film or cloth
Machine setting applies glue in the contact surface (cellular node) of corrugation, corrugation is bonded to form honeycomb, then cuts honeycomb
At pointed cone or cone and various shape are split, impregnates electrocondution slurry.Or using conductive shaping glue, remove cellular electrocondution slurry leaching from
Stain technique.The intensity of cellular material is significantly larger than the light materials such as foam, and compressive strength is high-intensitive bubble under same density
One times of foam, mature production technology, with different paper, cloth, glass-fiber-fabric is north to expect that thin slice etc. produce cellular structural material.Bee
Nest section bore is bigger, and honeycomb is lighter, and cost is also lower.Due to the high conductivity of graphene, microwave absorbing coating can be very
Thin, flexibility is good, more preferable with the compatibility of paper, film and fiber cloth, and the brittleness of carbon black coating will not occur and fall off existing
As.The angle of corrugation can design according to demand, i.e., cellular opening direction and angle are the designs that can be orientated according to corrugation
Adjustment, mean that most preferably inhaling wave incidence angle can optimize as absorbing material, the pointed cone being cut into is also possible to different points
Angle.It is different from polyurethane foam, since the rigidity of material is high, even if non-perpendicular inclination pointed cone honeycomb, will not occur foam
The bending deformation problem of pointed cone.Corrugated case is main packaging material, and technology maturation is low in cost, and the brown paper of raw material is every
Ton is only thousands of members, lower than the cost of polyurethane sponge, is had in cost using the honeycomb of corrugated paper technology preparation apparent
Advantage, while being also significantly larger than existing sponge absorbing material in properties of product, so lightweight produced by the present invention suction wave is dark
Room pointed cone material is high performance-price ratio, the absorbing material that can substitute sponge.
Preferably, the design and selection of honeycomb pointed cone structure use electromagnetic simulation software optimised shape in step (1)
With the Microwave electromagnetic properties for inhaling wave slurry, slurry electromagnetic performance is compound dielectric and thickness or simple surface plural number side
Resistance.It is described that cellular design is optimized by electromagnetic simulation software, it is dielectric constant or sheet resistivity conductive coat, honeycomb
Size and shape, material shape and thickness etc. input computer program and carry out electromagnetism calculating and optimization, which can be business
Software and self-compiling program, common business software such as HFSS, XFDTD, CST etc. can be used for electromagnetism calculating, can also be self-editing special
With program, more effectively realizes design rapid Optimum, equity of the invention can't be changed using different software.Using limited
First Electromagnetic Simulation design alternative is for producing cellular flexible parent metal, electromagnetic parameter and honeycomb feature, the choosing of flexible parent metal
Selecting parameter includes thickness and dielectric constant, and electromagnetic parameter includes sheet resistivity, and honeycomb feature includes honeycomb side length, honeycomb
Tilt angle, honeycomb height, pointed cone height and width etc..
Optimum results discovery of the invention: it compared with conductive black, metal powder, graphite powder and other conductive powder bodies, receives
Rice graphene and more preferable as the effect of conductive additive with the complex of conductive black is honeycomb ruler using high frequency limit
The very little half wavelength less than the frequency.For high incidence angle demand, cellular inclination angle and incidence angle it is close when performance most
It is good.Performance requirement determines that its minimum honeycomb thickness, the coating resistance distribution of honeycomb inclination angle and honeycomb inner wall and honeycomb thickness are determined
Surely the frequency response that absorbs and to incidence angle susceptibility.
Optimization the result is that most thin (most short honeycomb) design and coating layer thickness or sheet resistivity for meeting the requirements and minimum
Cost.The cellular application frequency that the present invention can design production is 0.01~110GHz, and bandwidth is arbitrarily optional.Optimized incidence can
From normal incidence to 60 °.
Preferably, the range of viscosities of the graphene conductive slurry is 100~1000 in step (2) and step (6)
mPa·s；On the basis of graphene conductive slurry gross mass, the graphene conductive slurry by following mass percentage group
It is grouped as: graphene 1~40%, conductive black 0~20%, water-base resin 10~60% and balance of solvent.
The conductive wave absorbing agent of graphene conductive slurry is graphene and conductive black, and can be used alone compound can also make
With realizing least cost while meeting performance.Conductive black is acetylene carbon black and the highly conductive carbon black that high-temperature process is crossed.
The graphene is the slurry that the preparation of physics stripping method is used using graphite worm as raw material, and the graphite worm is from can be swollen
Graphite heated in high temperature furnace be made, heat expansion temperature be 600~1800 DEG C, preferably 900~1200 DEG C, atmosphere in furnace
It encloses for inert gas, the high temperature anaerobic tail gas after burning, nitrogen and argon gas etc.；Can swollen graphite expansion multiple be greater than 400 times,
The specific surface area of gained graphite worm is greater than 35m2/g.Any adhesive can be used in the present invention, can be organic polymer material
Expect the precursor with inorganic material and ceramics, usage amount is from 10% to 60% in formula.Solvent is to adjust productibility
And craftsmanship, selection are the type according to adhesive, viscosity model of the usage amount from 0% to 80%, as slurry in formula
It encloses for 100~1000mPas.Also various auxiliary agents can be used to change craftsmanship etc., such as levelling agent, dispersing agent.
Preferably, the water-base resin be selected from aqueous phenolic aldehyde, polyvinyl alcohol (PVA), polyvinylpyrrolidone (PVP),
The mixing of one or more of modified silicone resin, aqueous polyacrylamide acid, water-base epoxy, aqueous polyurethane, sepiolite and Silica hydrogel.
Aqueous slurry is more environmentally-friendly and uses safely, carries out drying at room temperature and heating according to the condition of cure of resin after dipping
Solidification.It, should to having had requirement of the honeycomb pointed cone of absorbing property according to client to color, dipping or sprayed protection finishing coat
Coating can increase the brightness or camouflage color of absorbing material use environment, waterproof coating is used without for interior, as excellent
Choosing, aqueous latex paint, water-base epoxy and aqueous polyurethane are environmental protection coating materials, dry solidification after dipping or spraying.
Preferably, shaping glue is coated on flexible parent metal surface using roll-to-roll process in step (2), it is full-automatic continuous
Roll-to-roll dipping, the production efficiency of drying and curing are high, and equipment cost is low, is suitble to mass production, with subsequent corrugation liter
Warm roll forming and honeycomb gluing arrangement linkage, realize the automation of whole production line.
Preferably, going out pointed cone by hyper tape saw cut in step (5)；The linear velocity of the high speed band saw is greater than
1000m/min；Preferably, honeycomb is fixed on mechanical arm and passes through the shape of computer program control cutting.
Therefore, the invention has the following beneficial effects:
(1) lightweight suction wave darkroom pointed cone material of the present invention assembles the honeycomb pointed cone structure to be formed by flexible parent metal, and in bee
Nest shape pointed cone body structure surface is equipped with graphene conductive coating, and low cost, high mechanical strength, density are low, the service life is long, performance is good, just
It is saved in shrinking collection, reduces transportation cost and collection space, be conducive to the construction and use in secrecy test outfield；
(2) preparation process high production efficiency of the invention, equipment cost is low, is suitble to mass production, arranges linkage between each technique,
Realize the automation of whole production line.
Detailed description of the invention
Fig. 1 is the preparation technology flow chart that lightweight of the present invention inhales wave darkroom pointed cone material.
Fig. 2 is the preparation technology flow chart of graphene conductive slurry of the present invention.
Fig. 3 is the rolling mill practice schematic diagram of corrugation.
Fig. 4 is a kind of oblique cellular structural schematic diagram.
Fig. 5 is a kind of straight cellular structural schematic diagram.
Fig. 6 is a kind of structural schematic diagram of honeycomb pointed cone.
Fig. 7 is the structural schematic diagram of brown paper honeycomb block.
Fig. 8 is the structural schematic diagram of ox-hide paper honeycomb pointed cone of the surface without graphene conductive coating.
Fig. 9 is the structural schematic diagram for the ox-hide paper honeycomb pointed cone that there is graphene conductive coating on surface.
Figure 10 is a kind of design section figure that beveled tip is split.
Specific embodiment
Below by specific embodiment, and in conjunction with attached drawing, the technical solutions of the present invention will be further described.
In the present invention, if not refering in particular to, all devices and raw material is commercially available or the industry is common are following
Method in embodiment is unless otherwise instructed conventional method in that art.
The lightweight of 120 DEG C of embodiment 1:300mm high long-time services inhales wave darkroom pointed cone material
(1) production technology determines flexible parent metal as shown in Figure 1, first using Electromagnetic Simulation optimization design honeycomb pointed cone structure
It is 110g/m for surface density2Fire-retardant brown paper, conductive wave absorbing agent be graphene, resin is water soluble phenolic；It is imitative according to electromagnetism
True design, honeycomb overall height H are 300mm, and pointed cone height h is 220mm, and bottom width D is 100mm, inhale wave to improve oblique incidence
Performance, using oblique honeycomb, cellular angle and opening form 15 ° of angles, and one layer of corrugated honeycomb is positive 15 ° of angles, are under it thereon
Minus 15 ° of angles form the alternating superposition at positive and negative 15 ° of angles, it is ensured that the symmetry of performance.Cellular side length and depth are 5mm, are inhaled
90 Europe of wave honeycomb sheet resistivity；
(2) graphene conductive slurry is prepared referring to Fig. 2: 420 times of expansion multiple of 50 mesh expansible graphites are used first, 1000
DEG C nitrogen protection electric furnace in expansion, obtain specific surface area 36m2The graphite worm of/g.Can swollen graphite furnace roof by screw rod into
The charging of material machine, expansion worm enter vacuum kettle in the furnace bottom high temperature furnace that blows off, after mixing with deionized water, vacuumize degassing, go from
The weight ratio of sub- water and worm is 100:5.It is stirred 1-5 hours to obtain slurry, from bottom by mashing pump to high shear colloid
Mill carries out recirculation gas stripper, removes shear velocity >=10000/s, up to graphene partial size is less than 20 microns, using laser particle size
Instrument measures partial size.Water soluble phenol resin and aqueous dispersion is added and defoaming agent obtains graphene phenolic aldehyde aqueous slurry, viscosity is about
800mPa·s.Deionized water, graphene, phenolic resin, dispersing agent and defoaming agent weight ratio be 100:5:15:2:0.5.Point
Powder is aqueous polyacrylamide acid, and defoaming agent is silicone compounds to get graphene conductive slurry；
(3) referring to Fig. 3 on the roll-to-roll production line of corrugated honeycomb, brown paper is continued through into 15% resol resins liquid bath,
Into 150 DEG C of oven drying, by 130 DEG C of gear rooling mills according to the corrugation of design rolling 5mm；
(4) corrugated plate is cut into 15 ° of oblique angles, by double rod glue spreaders, applies 25% aqueous phenolic aldehyde node glue on the contact surface, so
It is alternately superimposed positive and negative 15 ° of corrugations afterwards and forms honeycomb block, honeycomb block is moved into such as baking oven, and pass through the methods of weight in honeycomb block
Form the pressure of 0.01~0.1kPa, it is ensured that the adhesive strength of honeycomb contact surface (node).180 DEG C of oven temperature, curing time
60min obtains the honeycomb block of integrated honeycomb (referring to Fig. 7)；
(5) honeycomb block is cut into 600x600x300mm, 36 220mm depths is then cut into honeycomb side with high speed electric band saw
The linear velocity of symmetrical pointed cone (referring to Fig. 8), band saw is greater than 1000m/min；
(6) pointed cone is impregnated in the graphene conductive slurry 3min of step (2) preparation, is taken out, room temperature is dried, then at 180 DEG C
Oven for curing 60min obtains graphene pointed cone and inhales wave honeycomb (referring to Fig. 9)；
(7) according to customer demand, spraying or dipping room temperature curing light color system coating.
Lightweight made from the present embodiment, which inhales wave darkroom pointed cone material, can be realized the absorbing property of 2GHz or more 40dB, meet
The fire retardant grade of flame retardant property, oxygen index (OI) are greater than 28%.
The lightweight of 300 DEG C of embodiment 2:500mm high long-time services inhales wave darkroom pointed cone material
(1) production technology determines flexible parent metal as shown in Figure 1, first using Electromagnetic Simulation optimization design honeycomb pointed cone structure
It is 200g/m for surface density2Glass-fiber-fabric, conductive wave absorbing agent be graphene, resin is modified silicone resin；It is set according to Electromagnetic Simulation
Meter, honeycomb overall height H are 500mm, and pointed cone height h is 400mm, and bottom width D is 150mm, in order to improve oblique incidence absorbing property,
Using oblique honeycomb, cellular angle and opening form 15 ° of angles, and one layer of corrugated honeycomb is positive 15 ° of angles, thereon be negative under it 15 °
Angle forms the alternating superposition at positive and negative 15 ° of angles, it is ensured that the symmetry of performance.Cellular side length and depth are 5mm, inhale wave honeycomb
100 Europe of sheet resistivity；
(2) prepare graphene conductive slurry referring to Fig. 2: first using 420 times of expansion multiple 50 mesh can swollen graphite, at 1000 DEG C
Nitrogen protection electric furnace in expansion, obtain specific surface area 36m2The graphite worm of/g.Can swollen graphite in furnace roof pass through screw feed
Machine charging, expansion worm enter vacuum kettle in the furnace bottom high temperature furnace that blows off, after mixing with deionized water, vacuumize degassing, deionization
The weight ratio of water and worm is 100:5.It is stirred 1-5h and obtains slurry, from bottom by mashing pump to high-shear colloid mill, carry out
Recirculation gas stripper removes shear velocity >=10000/s, until graphene partial size measures grain less than 20 microns, using laser particle analyzer
Diameter.Modified silicone resin and aqueous dispersion is added and defoaming agent obtains graphene silicone resin slurry, viscosity about 600mPas.Go from
Sub- water, graphene, modified silicone resin, dispersing agent and defoaming agent weight ratio be 100:5:20:2.5:0.5.Dispersing agent is aqueous
Polyacrylic acid, defoaming agent are silicone compounds to get graphene conductive slurry；
(3) referring to Fig. 3 on the roll-to-roll production line of corrugated honeycomb, by glass-fiber-fabric continue through in have graphite made from step (2)
The graphene modified silicone resin liquid bath of alkene electrocondution slurry, into 150 DEG C of oven drying, by 150 DEG C of gear rooling mills according to setting
The corrugation of meter rolling 5mm；
(4) corrugated plate is cut into 15 ° of oblique angles, by double rod glue spreaders, applies 25% modified silicone resin node glue on the contact surface,
Then positive and negative 15 ° of corrugations are alternately superimposed and form honeycomb block, honeycomb block are moved into such as baking oven, and pass through the side such as weight in honeycomb block
Method forms the pressure of 0.01~0.1kPa, it is ensured that the adhesive strength of honeycomb contact surface (node).250 DEG C of oven temperature, when solidification
Between 60min obtain honeycomb block (referring to fig. 4 or Fig. 5 or Fig. 6)；
(5) honeycomb block is cut into 600x600x500mm, 16 400mm depths is then cut into honeycomb side with high speed electric band saw
Symmetrical pointed cone obtains graphene pointed cone and inhales wave honeycomb；
(6) according to customer demand, spraying or dipping room temperature curing light color system coating；
Lightweight made from the present embodiment, which inhales wave darkroom pointed cone material, can be realized the absorbing property of 1GHz or more 40dB, meet fire-retardant
The non-ignitable grade of performance, oxygen index (OI) are greater than 60%.
80 DEG C of long-time service oblique incidences of embodiment 3:400mm high inhale wave wedge honeycomb lightweight and inhale wave darkroom pointed cone material (1)
Production technology determines that flexible parent metal is that face is close as shown in Figure 1, first using Electromagnetic Simulation optimization design honeycomb pointed cone structure
Degree is 60g/m2Polyester non-woven fabric (100 μm of thickness), conductive wave absorbing agent be graphene, resin is phenol-formaldehyde resin modified；According to
Electromagnetic Simulation design, honeycomb overall height H are 400mm, and pointed cone height h is 300mm, and bottom width D is 120mm, in order to improve oblique incidence
Absorbing property, using oblique honeycomb, about 40 ° of angles on one side of honeycomb pointed cone, another side is 52 ° of angles, and cellular angle and opening are formed
45° angle, cellular side length and depth are 5mm, inhale 100 Europe of wave honeycomb sheet resistivity；
(2) prepare graphene conductive slurry referring to Fig. 2: first using 500 times of expansion multiple 50 mesh can swollen graphite, at 950 DEG C
Nitrogen protection electric furnace in expansion, obtain specific surface area 41m2The graphite worm of/g.Can swollen graphite in furnace roof pass through screw feed
Machine charging, expansion worm enter vacuum kettle in the furnace bottom high temperature furnace that blows off, after mixing with deionized water, vacuumize degassing, deionization
The weight ratio of water and worm and acetylene carbon black is 100:4.5:2.Be stirred 1-5 hours slurry, from bottom by mashing pump to
High-shear colloid mill carries out recirculation gas stripper, removes shear velocity >=10000/s, until graphene partial size less than 15 microns, is adopted
Partial size is measured with laser particle analyzer.Modified phenolic rouge and aqueous dispersion is added and defoaming agent obtains graphene silicone resin slurry, glues
Spend about 850mPas.Deionized water, graphene, acetylene carbon black, phenol-formaldehyde resin modified, dispersing agent and defoaming agent weight ratio be
100:4.5:2:15.5:2.5:0.5.Dispersing agent is aqueous polyacrylamide acid, and defoaming agent is silicone compounds to get graphene
Electrocondution slurry；
(3) on the roll-to-roll production line of corrugated honeycomb, by polyester non-woven fabric continue through in there is graphene made from step (2) to lead
The graphene phenol-formaldehyde resin modified liquid bath of plasma-based material, into 120 DEG C of oven drying, by 140 DEG C of gear rooling mills according to design
Roll the corrugation of 5mm；
(4) corrugated plate is cut into 60 ° of oblique angles, by double rod glue spreaders, applies 20% phenol-formaldehyde resin modified node on the contact surface
Glue, then alternately superposition corrugation forms oblique honeycomb block, honeycomb block is moved such as baking oven, and pass through the methods of weight in honeycomb block
Form the pressure of 0.01~0.03kPa, it is ensured that the adhesive strength of honeycomb contact surface (node).150 DEG C of oven temperature, when solidification
Between 30min obtain honeycomb block；
(5) honeycomb block is cut into 600x800x400mm, it is deeply oblique that 5 300mm are then cut into honeycomb side with high speed electric band saw
Wedge (referring to Figure 10) obtains graphene beveled tip and splits and inhales wave honeycomb；
(6) according to customer demand, spraying or dipping room temperature curing light color system coating；
Lightweight made from the present embodiment, which inhales wave darkroom pointed cone material, can be realized the wave absorbtion in 45 ° of above 40dB of incidence angle 2GHz
Can, meet the fire retardant grade of flame retardant property, oxygen index (OI) is greater than 28%.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the present invention in any form, and is not surpassing
There are also other variations and modifications under the premise of technical solution documented by claim out.
Claims (10)
1. a kind of lightweight inhales wave darkroom pointed cone material, which is characterized in that the lightweight, which inhales wave darkroom pointed cone material, to be had by flexibility
Substrate assembles the honeycomb pointed cone structure to be formed, and the honeycomb pointed cone body structure surface is equipped with graphene conductive coating.
2. a kind of lightweight according to claim 1 inhales wave darkroom pointed cone material, which is characterized in that the honeycomb pointed cone knot
Structure includes that several inhale wave honeycomb；The suction wave honeycomb is that straight honeycomb or beveled tip split honeycomb；The beveled tip splits cellular honeycomb folder
Angle is less than 70 °.
3. a kind of lightweight according to claim 1 inhales wave darkroom pointed cone material, which is characterized in that the flexible parent metal is
Paper, cloth, plastic film, flexible foam plate and be bonded together by the flexible parent metal in the hard plate for forming folding structure one
Kind is several；The flexible parent metal with a thickness of 0.01~5mm.
4. a kind of lightweight according to claim 1 inhales wave darkroom pointed cone material, which is characterized in that the flexible parent metal is resistance
Fire one or more of brown paper, film, non-woven fabrics, aramid paper, glass-fiber-fabric, glass fiber paper；The surface density of the flexible parent metal
For 20~500g/m2。
5. a kind of lightweight according to claim 1 inhales wave darkroom pointed cone material, which is characterized in that the graphene conductive applies
The equivalent face resistance range of layer controls in 10~1000 Europe.
6. the preparation method that a kind of lightweight a method as claimed in any one of claims 1 to 5 inhales wave darkroom pointed cone material, which is characterized in that packet
Include following steps:
(1) design and selection for optimizing honeycomb pointed cone structure, determine flexible parent metal, electromagnetic parameter and structure feature；
(2) shaping glue, dry solidification are uniformly coated on flexible parent metal surface；The shaping glue is conductive suction wave sizing slurry or non-
Conduction inhales wave sizing slurry；The conductive wave sizing slurry of inhaling is graphene conductive slurry；
It (3), will be described through step (2) treated flexible parent metal by a pair of gear rolling corrugation that heats up according to design parameter
Design parameter includes the depth, angle and width of corrugation；The heating temperature for suppressing corrugation is greater than 80 DEG C；
(4) by corrugation contact with each other face coating bonding glue, arrange to form honeycomb by design angle, hot-press solidifying obtains integration
Honeycomb；
(5) integrated honeycomb is cut into pointed cone, obtains cone-shaped honeycomb；
(6) shaping glue used in step (2) be non-conductive suctions wave be formed slurry when, have honeycomb sharp for what step (5) obtained
The flexible parent metal of wimble structure impregnates or spraying graphite alkene electrocondution slurry, and dry solidification forms graphene conductive coating to get lightweight
Inhale wave darkroom pointed cone material；The shaping glue used in step (2) be it is conductive inhale wave be formed slurry when, omit the step.
7. the preparation method that lightweight according to claim 6 inhales wave darkroom pointed cone material, which is characterized in that step (2) and
In step (6), the range of viscosities of the graphene conductive slurry is 100~1000mPas；With the total matter of graphene conductive slurry
On the basis of amount, the graphene conductive slurry is grouped as by the group of following mass percentage: graphene 1~40%, conductive charcoal
Black 0~20%, water-base resin 10~60% and balance of solvent.
8. the preparation method that lightweight according to claim 7 inhales wave darkroom pointed cone material, which is characterized in that the aqueous tree
Rouge is selected from aqueous phenolic aldehyde, polyvinyl alcohol, polyvinylpyrrolidone, modified silicone resin, aqueous polyacrylamide acid, water-base epoxy, aqueous
The mixing of one or more of polyurethane, sepiolite and Silica hydrogel.
9. the preparation method that lightweight according to claim 6 inhales wave darkroom pointed cone material, which is characterized in that in step (2),
Shaping glue is coated on flexible parent metal surface using roll-to-roll process.
10. the preparation method that lightweight according to claim 6 inhales wave darkroom pointed cone material, which is characterized in that step (5)
In, pointed cone is gone out by hyper tape saw cut；The linear velocity of the high speed band saw is greater than 1000m/min.
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