CN106358431A - Quartz-based wave-absorbing material - Google Patents
Quartz-based wave-absorbing material Download PDFInfo
- Publication number
- CN106358431A CN106358431A CN201610990758.3A CN201610990758A CN106358431A CN 106358431 A CN106358431 A CN 106358431A CN 201610990758 A CN201610990758 A CN 201610990758A CN 106358431 A CN106358431 A CN 106358431A
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- Prior art keywords
- powder
- quartz
- carbon black
- add
- absorbing material
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
- H05K9/0088—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising a plurality of shielding layers; combining different shielding material structure
Abstract
The invention discloses a quartz-based wave-absorbing material which is composed of an impedance matching layer, a loss layer and a reflecting layer from top to bottom, wherein the impedance matching layer is formed by 2-5wt% of graphene powder/ferroferric oxide powder dispersed in chloroprene rubber, the loss layer is formed by hydroxyl iron powder dispersed in the chloroprene rubber, and the reflecting layer is formed by 5-20wt% of a quartz/carbon black composite material dispersed in the chloroprene rubber. The shielding performance of the wave-absorbing material disclosed by the invention is increased to -35 to -37dB when the thickness is 0.2mm, and the performance is excellent.
Description
Technical field
The present invention relates to new material technology field, more particularly, to a kind of quartz base wave-absorbing material.
Background technology
With the development of modern science and technology, the impact to environment for the electromagenetic wave radiation increasingly increases.Airport, machine flight because
Electromagnetic Interference cannot be taken off and overdue；The normal work of various electronic instrument for diagnosing and curing diseases devices often can be disturbed in hospital, mobile phone.Cause
This, administer electromagnetic pollution, finds a kind of material absorbing material that can keep out and weaken electromagenetic wave radiation, it has also become material supply section
The big problem learned.
Absorbing material refers to absorb, decaying projects the electromagnetic wave energy of material surface, and electromagnetic energy is passed through in material
The dielectric loss in portion is converted into into the class functional material that the energy dissipation of the other forms such as heat energy is fallen.Absorbing material is by absorbing
Agent, adhesive and various auxiliary agent composition, the electromagnetic performance of wherein absorbent determines the quality of microwave absorbing coating performance, in cell material
Misusing of key is played in material.
Present inventors have proposed a kind of absorbing material structure, it is from top to bottom by impedance matching layer, depletion layer and reflecting layer
Composition, every layer of effect is different, and the material that it contains also is not quite similar.Through multiple verification experimental verifications it was demonstrated that this structure design is to close
Reason is effectively.Therefore the present inventor carries out material selection Optimal improvements, to optimizing its absorbing property, research to each functional layer
And improve specific matching relationship between each functional layer material, derived a series of applications simultaneously.
With the development of modern crafts, the requirement more and more higher to absorbing material it is desirable to while wave-absorbing effect is preferable,
Possess preferable physical and mechanical propertiess, preferable heat-resisting quantity and working service simple etc..
Content of the invention
It is an object of the invention to proposing a kind of quartz base wave-absorbing material, it is applied in described reflecting layer, with impedance layer
In specific components form matching relationship, the absorbing property enabling to material is greatly improved.
For reaching this purpose, the present invention employs the following technical solutions:
A kind of absorbing material, particularly a kind of quartz base wave-absorbing material, its from top to bottom by impedance matching layer, depletion layer and
Reflecting layer forms, and impedance matching layer is distributed in neoprene and is formed by 2-5wt% graphene powder/ferroso-ferric oxide powder body,
Depletion layer is distributed in neoprene for hydroxy iron powder and is formed, and reflecting layer is distributed to by 5-20wt% quartz/carbon black composite material
Formed in neoprene.
White carbon black belongs to a kind of conductive filler, the therefore quartz/carbon black composite material of the present invention, and it is to shielding electromagnetic waves master
Depend on the reflection to incident electromagnetic wave.When the quartz/carbon black composite material surface of electromagnetic wave incident to the present invention,
There is serious polarization in its material internal, make the concussion of electromagnetic field form vortex in material internal conductive network, so that electromagnetic energy is turned
Turn to heat energy and consume.Increase when content of carbon black forms conductive network number in material internal, the electric conductivity of material strengthens,
Electromagnetic wave is strengthened, the shielding propertiess of material also strengthen therewith in the reflecting properties of material surface.
Due to high conductivity and the tunnel conduction effect of white carbon black, typically only need to little white carbon black addition it is possible to shape
Become relatively advanced conductive network, can ensure that matrix material has good mechanical property after mixing with matrix material,
Therefore in the quartz/carbon black composite material of the present invention, the volumn concentration of white carbon black is 1-15vol%.
The preparation method of the described quartz/carbon black composite material of the present invention is as follows:
(1) proportionally silica flour and white carbon black are put into ball mill, ball milling 4-6 hour, obtain powder；
(2) add and account for the waterglass of powder quality 20-30wt%, adding and accounting for the concentration of powder quality 20-30wt is 8-
The polyvinyl alcohol of 12wt%, after being uniformly mixed, compressing；
(3) moulded products obtaining described molding are heated to 180-220 DEG C, constant temperature at least 3 hours；
(4) profiled member after heat treatment is ground into powder, obtains described quartz/carbon black composite material.
Preferably, the described graphene powder/ferroso-ferric oxide powder preparation method of the present invention is as follows:
(1), under condition of ice bath, under mechanical agitation, add crystalline graphite powder in 98% concentrated sulphuric acid, add and account for
The sodium nitrate of graphite powder 50-80wt%, and account for the potassium permanganate of 2-4 times of weight of graphite powder, react 30-120min under ice bath；
(2) it is heated to 30-40 DEG C of constant temperature 4-5h, adds deionized water and hydrogen peroxide, stir 1-3h, add 5% concentration
Hcl centrifuge washing, until sulfate radical-free ion, obtains graphene oxide after being dried；
(3) described graphene oxide is distributed in ethanol solution, ultrasonic disperse obtains graphene oxide colloid
Solution；
(4) described graphene oxide colloid solution is heated to 65-75 DEG C, stirring is lower to add mass concentration to be 70-85%
Hydrazine hydrate, reaction 0.5-2 hour after, according to Graphene: ferroso-ferric oxide mass ratio be 2:1～1:2 ratio, add four oxygen
Change three iron powder, mix homogeneously；
(5) centrifugation washing, vacuum drying obtains Graphene/ferroso-ferric oxide powder body.
The present invention passes through specific recipe ingredient, and three layers that devise impedance matching layer/depletion layer/reflecting layer composition are combined
Thin film, the wave-absorbing effect in its front be significantly better than reverse side it was demonstrated that the design of described membrane structure correct.
Absorbing material of the present invention, its when thickness is for 0.2mm, when using graphite as reflecting layer principal goods matter,
Its absorption maximum is only -9.46db.When replacing with the quartz/carbon black composite material of the present invention, its shielding properties increases to -35
～-37db, the reflecting material excellent performance of the present invention.
Specific embodiment
To further illustrate technical scheme below by specific embodiment.
Embodiment 1
A kind of quartz base wave-absorbing material, it is made up of impedance matching layer, depletion layer and reflecting layer from top to bottom, impedance matching
Layer is distributed in neoprene and is formed by 2wt% graphene powder/ferroso-ferric oxide powder body, and depletion layer is distributed to for hydroxy iron powder
Formed in neoprene, reflecting layer is distributed in neoprene and is formed by quartz/carbon black composite material.Described quartz/white carbon black is multiple
In condensation material, white carbon black accounts for 8wt%.
The preparation method of described quartz/carbon black composite material is as follows:
(1) proportionally silica flour and white carbon black are put into ball mill, ball milling 4 hours, obtain powder；
(2) add and account for the waterglass of powder quality 20wt%, adding and accounting for the concentration of powder quality 20wt% is 8wt%'s
Polyvinyl alcohol, after being uniformly mixed, compressing；
(3) moulded products obtaining described molding are heated to 180 DEG C, constant temperature at least 3 hours；
(4) profiled member after heat treatment is ground into powder, obtains described quartz/carbon black composite material.
After tested, this absorbing material,, when thickness is for 0.2mm, shielding propertiess increase to -35～-37db for it.
Comparative example 1
A kind of modified ferroferric oxide wave absorbing material of Graphene, it is from top to bottom by impedance matching layer, depletion layer and anti-
Penetrate layer composition, impedance matching layer is distributed in neoprene and is formed by graphene powder/ferroso-ferric oxide powder body, depletion layer is hydroxyl
Base iron powder is distributed in neoprene and is formed, and reflecting layer is formed in neoprene by graphite dispersion, and described impedance matching layer contains
There is 2% graphene powder/ferroso-ferric oxide powder body.
Described Graphene/ferroso-ferric oxide powder preparation method is as follows:
(1), under condition of ice bath, under mechanical agitation, add crystalline graphite powder in 98% concentrated sulphuric acid, add and account for
The sodium nitrate of graphite powder 80wt%, and account for the potassium permanganate of 2 times of weight of graphite powder, react 30min under ice bath；
(2) it is heated to 30 DEG C of constant temperature 4h, adds deionized water and hydrogen peroxide, stir 1h, add the hcl centrifugation of 5% concentration
Washing, until sulfate radical-free ion, obtains graphene oxide after being dried；
(3) described graphene oxide is distributed in ethanol solution, ultrasonic disperse obtains graphene oxide colloid
Solution；
(4) described graphene oxide colloid solution is heated to 65 DEG C, stirring is lower to add the hydration that mass concentration is 85%
Hydrazine, after reacting 0.5 hour, according to Graphene: ferroso-ferric oxide mass ratio is the ratio of 1:2, adds ferroferric oxide powder, mixes
Close uniformly；
(5) centrifugation washing, vacuum drying obtains Graphene/ferroso-ferric oxide powder body.
Absorbing material described in comparative example 1, its when thickness is for 0.2mm, its absorption maximum position -9.46db.
Embodiment 1 is proved with the contrast of comparative example 1, quartz/carbon black composite material of the present invention, can significantly increase suction
Ripple performance.
Claims (4)
1. a kind of quartz base wave-absorbing material, it is made up of impedance matching layer, depletion layer and reflecting layer from top to bottom, impedance matching layer
It is distributed in neoprene and is formed by 2-5wt% graphene powder/ferroso-ferric oxide powder body, depletion layer is distributed to for hydroxy iron powder
Formed in neoprene, reflecting layer is distributed in neoprene and is formed by 5-20wt% quartz/carbon black composite material.
2. quartz base wave-absorbing material as claimed in claim 1 is it is characterised in that in described quartz/carbon black composite material, white carbon black
Account for 1-15vol%.
3. quartz base wave-absorbing material as claimed in claim 1 or 2 is it is characterised in that described Graphene/ferroso-ferric oxide powder body
Preparation method is as follows:
(1), under condition of ice bath, under mechanical agitation, add crystalline graphite powder in 98% concentrated sulphuric acid, add and account for graphite
The sodium nitrate of powder 50-80wt%, and account for the potassium permanganate of 2-4 times of weight of graphite powder, react 30-120min under ice bath；
(2) be heated to 30-40 DEG C of constant temperature 4-5h, add deionized water and hydrogen peroxide, stir 1-3h, add the hcl of 5% concentration from
Heart washing, until sulfate radical-free ion, obtains graphene oxide after being dried；
(3) described graphene oxide is distributed in ethanol solution, ultrasonic disperse obtains graphene oxide colloid solution；
(4) described graphene oxide colloid solution is heated to 65-75 DEG C, stirring is lower to add the water that mass concentration is 70-85%
Close hydrazine, after reaction 0.5-2 hour, according to Graphene: ferroso-ferric oxide mass ratio is the ratio of 2:1～1:2, add four oxidations three
Iron powder, mix homogeneously；
(5) centrifugation washing, vacuum drying obtains Graphene/ferroso-ferric oxide powder body.
4. the quartzy base wave-absorbing material as described in one of claim 1-3 is it is characterised in that described quartz/carbon black composite material
Preparation method as follows:
(1) proportionally silica flour and white carbon black are put into ball mill, ball milling 4-6 hour, obtain powder；
(2) add and account for the waterglass of powder quality 20-30wt%, adding and accounting for the concentration of powder quality 20-30wt is 8-
The polyvinyl alcohol of 12wt%, after being uniformly mixed, compressing；
(3) moulded products obtaining described molding are heated to 180-220 DEG C, constant temperature at least 3 hours；
(4) profiled member after heat treatment is ground into powder, obtains described quartz/carbon black composite material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610990758.3A CN106358431A (en) | 2016-11-10 | 2016-11-10 | Quartz-based wave-absorbing material |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610990758.3A CN106358431A (en) | 2016-11-10 | 2016-11-10 | Quartz-based wave-absorbing material |
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| CN106358431A true CN106358431A (en) | 2017-01-25 |
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| CN201610990758.3A Pending CN106358431A (en) | 2016-11-10 | 2016-11-10 | Quartz-based wave-absorbing material |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020188152A1 (en) * | 2019-03-18 | 2020-09-24 | Jose Buendia | Suppression of electronic noise |
Citations (4)
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|---|---|---|---|---|
| CN1822253A (en) * | 2006-03-31 | 2006-08-23 | 北京工业大学 | Soft magnetic composite material for suppressing wide band electromagnetic interference |
| CN101700706A (en) * | 2009-11-18 | 2010-05-05 | 中南大学 | Lightweight and broadband wave absorbing material with foam sandwich structure and method for producing same |
| CN102179965A (en) * | 2010-12-28 | 2011-09-14 | 中国航空工业集团公司北京航空材料研究院 | Three-layer composite wave-absorbing film and preparation method thereof |
| CN105647468A (en) * | 2016-04-07 | 2016-06-08 | 兰州天烁新能源有限公司 | Wave-absorbing material based on grapheme and preparation method thereof |
-
2016
- 2016-11-10 CN CN201610990758.3A patent/CN106358431A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1822253A (en) * | 2006-03-31 | 2006-08-23 | 北京工业大学 | Soft magnetic composite material for suppressing wide band electromagnetic interference |
| CN101700706A (en) * | 2009-11-18 | 2010-05-05 | 中南大学 | Lightweight and broadband wave absorbing material with foam sandwich structure and method for producing same |
| CN102179965A (en) * | 2010-12-28 | 2011-09-14 | 中国航空工业集团公司北京航空材料研究院 | Three-layer composite wave-absorbing film and preparation method thereof |
| CN105647468A (en) * | 2016-04-07 | 2016-06-08 | 兰州天烁新能源有限公司 | Wave-absorbing material based on grapheme and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 祝俊，朱漪云: "《基于新型微纳减反结构的硅基太阳能电池研究》", 30 November 2013 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020188152A1 (en) * | 2019-03-18 | 2020-09-24 | Jose Buendia | Suppression of electronic noise |
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Application publication date: 20170125 |