CN105979759A - Wave-absorbing particle - Google Patents
Wave-absorbing particle Download PDFInfo
- Publication number
- CN105979759A CN105979759A CN201610564940.2A CN201610564940A CN105979759A CN 105979759 A CN105979759 A CN 105979759A CN 201610564940 A CN201610564940 A CN 201610564940A CN 105979759 A CN105979759 A CN 105979759A
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- China
- Prior art keywords
- micro
- wave
- carbon
- carbon line
- line circle
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Classifications
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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
Abstract
The invention provides a wave-absorbing particle which has a particle-shaped base. The wave-absorbing particle is characterized in that the base is provided with multiple micro carbon coils. The micro carbon coils have one or multiple lengths so as to realize the absorption effect for electromagnetic waves of different frequency domains. The optimal condition of the wave-absorbing particle is that the micro carbon coils have multiple lengths from 10 microns to 5 millimeters, the ratio of the spiral diameter to the pitch of each micro carbon coil is within 1:1-5, and the ratio of the carbon filament diameter to the spiral diameter is within 1:5-10. A fundamental solution for effective absorption of space electromagnetic radiation is provided, and the wave-absorbing particle has the advantages of being wide in wave absorbing frequency domain, high in efficiency, low in cost, suitable for mass production and easy to be combined with other substances so that the wave-absorbing particle is an excellent product in the technical, practical and economic aspects and the wave-absorbing particle is suitable for popularization and application.
Description
Technical field
The present invention relates to electromagnetic shielding and absorption techniques field, be specifically related to a kind of suction ripple granule.
Background technology
Along with growth in the living standard, electrical equipment miscellaneous occurs in average family, such as ice
Case, washing machine, mobile phone, wireless router etc., the thing followed in addition to facility in life,
It it is exactly also electromagnetic radiation puzzlement；Even if few with or without electrical equipment, the space that we are lived is still
So being flooded with the electromagnetic radiation of various frequency, these electromagnetic radiation sources are in outdoor high tension transmission
Line, transformer station, transformator, communication base station, communications satellite etc..In theory, as long as using
The device of electricity, machine all can produce certain electromagnetic radiation, the electromagnetic radiation of these shape form formulas
Just as air is generally present in us at one's side, it is not only human body, also has precision electronic device
All there is harm, according to investigations, electromagnetic radiation of mobile telephone can be to the closely doctor of nearly 60 percent
Treat apparatus and produce impact, cause its misoperation.Additionally, modern military is competed from traditional fire
Device resists the antagonism that complete transition is electronics military equipment, the electronics military equipment energy of these precisions
The greatly military general layout of impact, or even war situation, but self is the most fragile, some strength
Electromagnetic interference or electromagnetic impact be enough to the electronics military equipment property made havoc, therefore with in army
Thing technical field needs also exist for answering for aspects such as electromagnetic impact protection, opportunity of combat stealth coatings
With.
As solution, there has been proposed many electromagnetic shielding materials and electro-magnetic wave absorption material
Material carrys out the extraneous electromagnetic radiation in shielding space.Widely used ELECTROMAGNETIC RADIATION SHIELDING skill at present
Art is nearly all that electromagnetic radiation is reflected by the metal sheet utilizing high conductivity, stops
It is directly entered in shield ranges, but the electromagnetic radiation after reflection is still in the middle of space, aobvious
So this is not the essence countermeasure of protection electromagnetic radiation, is sought after real electro-magnetic wave absorption material
Material, the most conventional absorbing material is ferrite, but is as the innovative development of science and technology,
As the communication equipments such as high speed road traffic system ITS, wireless network, various media machines equipment,
The high speed of computer etc., the application of electromagnetic wave frequency range becomes the broadest, the chi to absorbing material
Very little, weight, wave absorbing efficiency have had more stringent requirement, along with scouting detection means, satellite
The continuous progress of communication technology, and the attention that people are to hazards of electromagnetic radiation, hundreds of MHz
The research of wideband novel wave-absorbing material to GHz up to a hundred becomes the focus of concern.
The problem thus drawn has:
1) existing ferrite electromagnetic ripple protective material can only realize the suction of below 20GHz frequency range
Receive, and its physical characteristic limits and cannot develop toward high band, the most more " heavy ",
Existing suction ripple needs can not be met.
2) need to customize various sizes of absorbing material for different main bodys, it is more difficult to realize pre-
Customized production, makes absorbing material be limited in a lot of application scenarios, particularly external wall,
Door and window, furniture are carried out inhale the production occasion that ripple processes.
Summary of the invention
Based on problem mentioned in background technology, the present invention proposes a kind of suction ripple granule scheme,
It provides the essence solution effectively absorbed spacing electromagnetic radiation, and has suction ripple
It is excellent that frequency domain width, efficiency are high, with low cost, suitable amount metaplasia is produced, be easily combined with other material etc.
Point, its concrete technology contents is as follows:
A kind of suction ripple granule, has granular matrix, has multiple micro-carbon line circle in this matrix,
This micro-carbon line circle has one or more sizes to realize the absorption of corresponding different domain electromagnetic ripple
Effect, this size includes in the length to micro-carbon line circle, pitch, screw diameter, carbon line diameter
The adjustment of one or more parameters.
In the middle of one or more embodiments of the invention, this micro-carbon line circle has 10 microns extremely
Different lengths between 5 millimeters.
In the middle of one or more embodiments of the invention, the screw diameter of each micro-carbon line circle and spiral shell
Away from ratio between 1:1-5, carbon filament diameter and screw diameter are between 1:5-10.
In the middle of one or more embodiments of the invention, this micro-carbon line encloses gross weight
0.5%-5%.
In the middle of one or more embodiments of the invention, this micro-carbon line circle has electric conductivity plating
Layer.
In the middle of one or more embodiments of the invention, this matrix is macromolecular compound.
In the middle of one or more embodiments of the invention, this matrix is poly-methyl methacrylate
Ester, polyurethane, polysiloxanes PE or thermoplastic elastomer (TPE).
In the middle of one or more embodiments of the invention, this matrix also has some conductions single
Body, those conductive elements include one or more in granulated carbon, bar-shaped carbon, ferrite.
Compared with prior art, its advantageous exists the present invention:
1) micro-carbon line circle utilizes its three-dimensional spiral structure to produce magnetic strength electromotive force in electromagnetic field,
Finally with the form of heat energy, energy is discharged the effect with up to efficient absorption electromagnetic wave.These are different
In existing ELECTROMAGNETIC RADIATION REFLECTION made the return trip empty between scheme, but fundamentally realize electromagnetism spoke
Inject row sorption enhanced, and optimal absorption efficiency reaches more than 99%.
2) electromagnetic radiation of any direction can be realized efficiently inhaling by the three dimensional structure of micro-carbon line circle
Receiving, pearl all directions are open to the absorption of electromagnetic wave, it is possible to build the lowest electromagnetism spoke
Penetrate environment, even electromagnetic-radiation-free environment.
3) matrix is in granular form, and overcoming film like absorbing material must enter according to laying area
The inherent limitation of row customization, it is possible to conveniently mix with construction material or other material, is suitable for all kinds of
Building, production processing occasion, this is existing electro-magnetic wave absorption or shielding material is cannoted
Accomplish.
The present invention, no matter from technical, practicality or economy, is all to possess brilliance
Product, be suitable for promoting the use of.
Accompanying drawing explanation
Fig. 1 is suction ripple Particles Example one structural representation of the present invention.
Fig. 2 is the micro-carbon line circle microstructure schematic diagram one inhaling ripple granule of the present invention.
Fig. 3 is the micro-carbon line circle microstructure schematic diagram two inhaling ripple granule of the present invention.
Fig. 4 is the micro-carbon line circle schematic equivalent circuit inhaling ripple granule of the present invention.
Fig. 5 is the electromagnetic wave absorptivity test data drawing list one inhaling ripple granule of the present invention.
Fig. 6 is the electromagnetic wave absorptivity test data drawing list two inhaling ripple granule of the present invention.
Fig. 7 is the electromagnetic wave absorptivity test data drawing list three inhaling ripple granule of the present invention.
Fig. 8 is suction ripple Particles Example two structural representation of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the application scheme is further described:
Embodiment one
See accompanying drawing 1, a kind of suction ripple granule, there is granular matrix 1, in this matrix 1
Having multiple micro-carbon line circle 2, this micro-carbon line circle 2 has one or more length to realize correspondence
The assimilation effect of different domain electromagnetic ripples, the optimal conditions of the present invention: this micro-carbon line circle 2 has
Different lengths between 10 microns to 5 millimeters, the screw diameter of each micro-carbon line circle 2 and pitch
Ratio between 1:1-5, carbon filament diameter and screw diameter are between 1:5-10；This micro-carbon
Coil accounts for the 0.5%-5% of gross weight, wherein, 1%, 2% and 3% be relatively frequently with weight
Ratio.
See accompanying drawing 2-4, this micro-carbon line circle 2 form under an electron microscope, it can be seen that
This micro-carbon line astragal is that regular helix stretches, and has obvious pitch, and this is to wave-absorbing effect
Realize with absorption frequency domain adjustment significant.
This micro-carbon line circle 2 has three-dimensional spiral structure, and has resistance R, electric capacity C and electricity
Sense L characteristic (equivalent circuit sees accompanying drawing 4), can be learnt by Faraday law of electromagnetic induction,
It is in conductor coils in variation magnetic field and can produce induction electromotive force, then produce electric current, the present invention
Apply this physical phenomenon the most dexterously, make micro-carbon line Fig. 2 produce magnetic strength electricity in electromagnetic field
Kinetic potential, is finally discharged energy with the form of heat energy by self-resistance, and micro-carbon line circle 2 is due to it
Chiral material feature, its permitivity and magnetic susceptibility are big, lure electrical loss and magnetic losses than general
The attenuating of electromagnetic wave is become apparent from by material, incident straight partial wave electromagnetic wave (have level,
Vertical component) become Liang Ge garden, left and right partial wave (anticlockwise, right rotation), and at micro-carbon line circle 2
Middle generation reflection/loss at random and make electromagnetic wave subtract further and decline, this be fundamentally realize right
Electromagnetic radiation carries out sorption enhanced, and optimal absorption efficiency reaches more than 99%, this and ferrite
Principle of electromagnetic shield-ing be essentially different.Meanwhile, pearl is real to the electromagnetic radiation of all directions
Now open absorption, it is possible to build more preferably low electromagnetic environment, even electromagnetic-radiation-free environment.
Formula is calculated according to reflection coefficient
Wherein, R is reflection coefficient, Zin
For interface natural impedance, Z0For air impedance, μ is pcrmeability, and ε is dielectric constant；Work as Zin=Z0
Time, R=0, i.e. this material reach with free space natural impedance and mate, being reflected into of such electromagnetic wave
Zero.Can (be equivalent to select magnetic conductance by the size modes of selection matrix material, micro-carbon line circle
Rate and dielectric constant), to adjust the impedance matching of absorbing material and space, place, to reach more
High wave absorbing efficiency.
The comprehensive evaluation index (e) of electromagnetic wave absorbent material, represents by formula the following
E=Δ F λ/fdW；
Wherein, Δ F be the frequency domain of more than-20dB, λ be ripple, f frequency, d be to inhale
The thickness of acceptor, W are the weight of thin layer absorbing material.Thin layer absorbing material (ferrum on market
Oxysome) aggregative index be usually e=4.6～5.5, and absorbing material of the present invention is comprehensive
Index, up to e=7.45, shows as the most excellent absorbing property.
For improving the absorbance of electromagnetic wave, particularly at below 1GHz wave band, this micro-carbon line circle
Also can plate carbon-coating or the nickel dam setting high-crystallinity on 2, micro-carbon line circle 2 of plating carbon film is dispersed in
In the matrix of epoxy resin, it is contained in inside cuboid box, with sonde method (Probe
Method) experimental data that test draws shows have more than 90% in 400-900MHz field
Absorbance, see accompanying drawing 5.And plating sets nickel (Ni) layer on micro-carbon line circle 2, can increase
The magnetic loss of material, promotes the fade performance to electromagnetic wave.
Embodiment two
Seeing accompanying drawing 8, as the means of widening of absorption band domain, the present invention is at above-described embodiment one
On the basis of, its matrix 1 also has some conductive elements, those conductive elements include ferrum oxygen
Body 3 and bar-shaped carbon 4, ferrite is used for improving inductance L, increases magnetic loss；Bar-shaped carbon 4 (is received
Rice carbon-point or gas-phase growth of carbon fibre) then affect resistance R owing to overlapping with micro-carbon line circle, increase
Add electrical loss；Matrix is then to make contributions electric capacity C, increases dielectric loss；Become by those
Divide and collectively form resonator system, strengthen LCR resonance on the whole.
In the various embodiments described above, this matrix 1 can use and include epoxy resin-base, polyurethane
The macromolecule composite resin matrixes such as matrix, siloxane matrix, thermoplastic elastomer (TPE).
It is below the checking data of the absorbing property of the present invention:
One, the length of micro-carbon line circle and the relation of wave absorbing efficiency
See accompanying drawing 6, exist with the length micro-carbon line figure less than 90 microns and length respectively
Micro-carbon line circle of 150-300 micron carries out absorption rate testing, and test uses free-space Method to measure
The absorbance of electromagnetic wave:
In figure, curve a is the gross data of micro-carbon line circle suction ripple rate of 150-300 micron,
Curve b is the measured data that ripple rate inhaled by the micro-carbon line circle less than 90 microns；Can from data and curves
To learn, micro-carbon line circle of 150-300 micron shows have relatively in 70 to 100GHz scope
Wide absorption band domain (absorption value is at more than 15dB)；And the micro-carbon line circle less than 90 microns exists
Then there is several arrowband (absorption value is at more than 15dB) in this wavelength band, this illustrates this micro-carbon
Coil relevant to its length to a certain wave band electromagnetic wave absorptivity.
Two, the doping of micro-carbon line circle and the relation of wave absorbing efficiency
Seeing accompanying drawing 7, in figure, curve I correspondence is illustrated that ferritic suction wave profile, curve
II correspondence is illustrated that the suction wave profile of 1-2% micro-carbon line circle content, curve III correspondence illustrate
Be the suction wave profile of 6-8% micro-carbon line circle content；
It is appreciated that from data and curves:
Curve I compares with bent II, and the absorbing material containing micro-carbon line circle is in 10-40GHz frequency range
Absorbing property be substantially better than common containing ferritic absorbing material, there is electro-magnetic wave absorption peak
Wider effectively absorbs frequency domain；
Curve II compares with curve III, along with the increase of micro-carbon line circle addition, the LCR of pearl
Resonance characteristics reduces, and absorption peak is cut in and absorbs frequency domain narrowing, it is seen that adding of micro-carbon line circle
Dosage need to could obtain preferable wave-absorbing effect in preferred range, adds excess and also results in absorption
The decline of performance；The 0.5%-5% content that preferred range is such as pointed out in embodiment one, wherein,
1%, 2% and 3% be relatively frequently with part by weight.
Micro-carbon line circle of the present invention utilizes its three-dimensional spiral structure to produce magnetic strength electricity in electromagnetic field
Kinetic potential, finally discharges the effect with up to efficient absorption electromagnetic wave with the form of heat energy by energy.
This is different from existing scheme between being made the return trip empty by ELECTROMAGNETIC RADIATION REFLECTION, but fundamentally realize right
Electromagnetic radiation carries out sorption enhanced, and optimal absorption efficiency reaches more than 99%.Micro-carbon line circle
Three dimensional structure can realize efficient absorption to the electromagnetic radiation of any direction, and pearl all directions are to electricity
The absorption of magnetic wave is open, it is possible to build more preferably low electromagnetic environment, even without electromagnetism
Radiation environment.Matrix is in granular form, and overcoming film like absorbing material must be according to laying area
The inherent limitation being customized, it is possible to conveniently mix with construction material or other material, is suitable for each
Class building, production processing occasion, this is existing electro-magnetic wave absorption or shielding material institute nothing
Method is accomplished.
Above-mentioned preferred implementation should be regarded as the illustration of the application scheme embodiment, all and this Shen
Please scheme be identical, approximation or the technology made based on this are deduced, replace, improvement etc., all
Should be regarded as the protection domain of this patent.
Claims (8)
1. inhale ripple granule for one kind, it is characterized in that: there is granular matrix, there is in this matrix multiple micro-carbon line circle, this micro-carbon line circle has one or more sizes to realize the assimilation effect of corresponding different domain electromagnetic ripple, and this size includes the adjustment of one or more parameters in the length to micro-carbon line circle, pitch, screw diameter, carbon line diameter.
Suction ripple granule the most according to claim 1, it is characterised in that: this micro-carbon line circle has the different lengths between 10 microns to 5 millimeters.
Suction ripple granule the most according to claim 1, it is characterised in that: the screw diameter of each micro-carbon line circle and the ratio of pitch are between 1:1-5, and carbon filament diameter and screw diameter are between 1:5-10.
Suction ripple granule the most according to claim 1, it is characterised in that: this micro-carbon line encloses the 0.5%-5% of gross weight.
5. according to the suction ripple granule described in Claims 1-4 any one, it is characterised in that: on this micro-carbon line circle, there is electric conductivity coating.
6. according to the suction ripple granule described in Claims 1-4 any one, it is characterised in that: this matrix is macromolecular compound.
Suction ripple granule the most according to claim 6, it is characterised in that: this matrix is polymethyl methacrylate, polyurethane, polysiloxanes or thermoplastic elastomer (TPE).
8. according to the suction ripple granule described in Claims 1-4 any one, it is characterised in that: also having some conductive elements in this matrix, those conductive elements include one or more in granulated carbon, bar-shaped carbon, ferrite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610564940.2A CN105979759A (en) | 2016-07-18 | 2016-07-18 | Wave-absorbing particle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610564940.2A CN105979759A (en) | 2016-07-18 | 2016-07-18 | Wave-absorbing particle |
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| CN105979759A true CN105979759A (en) | 2016-09-28 |
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| CN201610564940.2A Pending CN105979759A (en) | 2016-07-18 | 2016-07-18 | Wave-absorbing particle |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106319671A (en) * | 2016-10-25 | 2017-01-11 | 福建星宏新材料科技有限公司 | Functional textile fiber capable of improving biological electromagnetic field of human body and fabric thereof |
| CN107879748A (en) * | 2017-05-25 | 2018-04-06 | 福建星宏新材料科技有限公司 | A kind of microwave heating ceramic vessel and preparation method thereof |
| CN108936960A (en) * | 2018-07-09 | 2018-12-07 | 唐山德善中医药科技发展有限公司 | A kind of independent assortment energy of a quantum unit insole |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1234840A (en) * | 1997-07-18 | 1999-11-10 | 科学技术振兴事业团 | Hollow microfiber and process for preparing same |
| JP4005222B2 (en) * | 1998-06-23 | 2007-11-07 | 株式会社ジャムコ | Electromagnetic wave absorber |
| JP2009060060A (en) * | 2007-09-03 | 2009-03-19 | Osaka Industrial Promotion Organization | Electromagnetic wave absorbing sheet |
| TW201112939A (en) * | 2009-09-23 | 2011-04-01 | Univ Nat Taiwan | Electromagnetic wave absorption component and electromagnetic wave absorption device |
-
2016
- 2016-07-18 CN CN201610564940.2A patent/CN105979759A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1234840A (en) * | 1997-07-18 | 1999-11-10 | 科学技术振兴事业团 | Hollow microfiber and process for preparing same |
| JP4005222B2 (en) * | 1998-06-23 | 2007-11-07 | 株式会社ジャムコ | Electromagnetic wave absorber |
| JP2009060060A (en) * | 2007-09-03 | 2009-03-19 | Osaka Industrial Promotion Organization | Electromagnetic wave absorbing sheet |
| TW201112939A (en) * | 2009-09-23 | 2011-04-01 | Univ Nat Taiwan | Electromagnetic wave absorption component and electromagnetic wave absorption device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106319671A (en) * | 2016-10-25 | 2017-01-11 | 福建星宏新材料科技有限公司 | Functional textile fiber capable of improving biological electromagnetic field of human body and fabric thereof |
| CN107879748A (en) * | 2017-05-25 | 2018-04-06 | 福建星宏新材料科技有限公司 | A kind of microwave heating ceramic vessel and preparation method thereof |
| CN108936960A (en) * | 2018-07-09 | 2018-12-07 | 唐山德善中医药科技发展有限公司 | A kind of independent assortment energy of a quantum unit insole |
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Application publication date: 20160928 |