CN107936480A - A kind of broadband composite wave-suction material containing thermal expansion graphene - Google Patents
A kind of broadband composite wave-suction material containing thermal expansion graphene Download PDFInfo
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- CN107936480A CN107936480A CN201711298646.2A CN201711298646A CN107936480A CN 107936480 A CN107936480 A CN 107936480A CN 201711298646 A CN201711298646 A CN 201711298646A CN 107936480 A CN107936480 A CN 107936480A
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
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- 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
- H05K9/009—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising electro-conductive fibres, e.g. metal fibres, carbon fibres, metallised textile fibres, electro-conductive mesh, woven, non-woven mat, fleece, cross-linked
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
Abstract
The present invention relates to a kind of broadband composite wave-suction material containing thermal expansion graphene, the composite wave-suction material is using epoxy resin as substrate, using thermal expansion graphene, carbon fiber, carbonyl iron dust, nickel-copper ferrite composite nano materials as filler, it is made by vacuum defoamation paddling process, uniform filling is distributed in the substrate.
Description
Technical field
The present invention relates to electromagnetic wave absorption material technical field, more particularly to a kind of broadband containing thermal expansion graphene
Composite wave-suction material.
Background technology
At this stage, as the rapid development and extensive use of electronic information, electromagnetic wave are inevitable as main carriers
Appear in life, electromagnetic pollution problem is serious all the more.The harm that electromagnetic wave produces is broadly divided into two aspects, on the one hand,
Electromagnetic wave can endanger the physical and mental health of people, and on the other hand, electromagnetic wave can make to interfere with each other between electronic instrument, influence instrument
Normal work, so as to cause huge economic loss.Therefore, electromagnetic pollution gradually causes the attention of people, has powered-down
The research of magnetic shielding material is also increasing.
At present, carbon material is one of ideal electromagnetic shielding material, and compared with metal material, carbon material has density
Low, the advantages that electrical conductivity is high, corrosion-resistant, therefore, the electromagnetic shielding composite material based on graphene and carbon nanotubes has advantage.
It is if however, simple using carbon nanotubes or graphene as filler, on the one hand, although the carbon nanometer of high filler loading capacity
Pipe or graphene can cause composite material to obtain satisfied effectiveness, but can also cause the cost of material to increase,
Preparation flow is complicated, and in the case of loading reaches a certain amount of, the raising continued to increase to shield effectiveness of loading is very
It is limited, and improve degree and constantly reduce；On the other hand, it is simple to regard carbon nanotubes or graphene as filler, also exist and shield
The problem of frequency is narrow.
The content of the invention
The present invention is intended to provide a kind of broadband composite wave-suction material containing thermal expansion graphene, set forth above to solve
Problem.
A kind of broadband composite wave-suction material containing thermal expansion graphene is provided in the embodiment of the present invention, this is compound
Absorbing material is using epoxy resin as substrate, with thermal expansion graphene, carbon fiber, carbonyl iron dust, nickel-copper ferrite composite Nano material
Expect for filler, to be made by vacuum defoamation paddling process, uniform filling is distributed in the substrate.
The technical solution that the embodiment of the present invention provides can include the following benefits：
The present invention composite wave-suction material using epoxy resin as substrate, with thermal expansion graphene, carbon fiber, carbonyl iron dust,
Nickel-copper ferrite composite nano materials are filler, which is respectively provided with good for the electromagnetic wave in 2~20GHz frequency ranges
Good absorbing property, maximum absorption 34.5dB, and suction intensity of wave uniformity is preferable in the frequency range, and average absorption amount is
30.5dB。
The additional aspect of the present invention and advantage will be set forth in part in the description, and will partly become from the following description
Obtain substantially, or recognized by the practice of the present invention.It should be appreciated that the general description and following detailed description of the above are only
It is exemplary and explanatory, the present invention can not be limited.
Brief description of the drawings
Using attached drawing, the invention will be further described, but the embodiment in attached drawing does not form any limit to the present invention
System, for those of ordinary skill in the art, without creative efforts, can also obtain according to the following drawings
Other attached drawings.
Fig. 1 is the preparation flow figure of broadband composite wave-suction material of the present invention.
Embodiment
Here exemplary embodiment will be illustrated in detail, its example is illustrated in the accompanying drawings.Following description is related to
During attached drawing, unless otherwise indicated, the same numbers in different attached drawings represent the same or similar key element.Following exemplary embodiment
Described in embodiment do not represent and the consistent all embodiments of the present invention.On the contrary, they be only with it is such as appended
The example of the consistent apparatus and method of some aspects being described in detail in claims, of the invention.
The embodiment of the present invention is related to a kind of broadband composite wave-suction material containing thermal expansion graphene, the composite wave-absorbing
Material using epoxy resin as substrate, using thermal expansion graphene, carbon fiber, carbonyl iron dust, nickel-copper ferrite composite nano materials as
Filler, is made by vacuum defoamation paddling process, and uniform filling is distributed in the substrate, wherein, the thermal expansion graphene, carbon fiber
For conductive filler, content is respectively 2wt%, 4wt%, and the carbonyl iron dust, nickel-copper ferrite composite nano materials are filled out for magnetism
Material, content is respectively 19wt%, 14wt%.
As described above, when using single filler, the graphene or carbon nanotubes of high filler loading capacity, although can make multiple
Condensation material obtains preferable effectiveness, but can also cause the cost of material to increase like that, in addition, single filler exists
The problem of efficiency is not high enough, screening frequencies is narrow, therefore, Composite are a kind of effective ways for obtaining the good absorbing material of shield effectiveness
Footpath.In the composite wave-suction material of the present invention, thermal expansion graphene, carbon fiber are used as conductive filler, carbonyl iron dust, ambrose alloy iron oxygen
Bluk recombination nano material is magnetic fillers, by the combined use of above-mentioned conductive filler and magnetic fillers, is generated unexpected
The advantages of absorption by force for broadband electromagnetic wave, enhance application range.
Particularly, under above-mentioned conductive filler and magnetic fillers content standard, the composite wave-suction material is for 2~20GHz
Electromagnetic wave in frequency range is respectively provided with good absorbing property, maximum absorption 34.5dB, and inhales intensity of wave in the frequency range
Uniformity is preferable, and average absorption amount is 30.5dB.
Preferably, in above-mentioned conductive filler, the length of the carbon fiber is 800 μm, a diameter of 50 μm.
The property of conductive filler, such as electrical conductivity, size, pattern etc. can directly influence the electromagnetic shielding effect of composite material
Fruit, in the technical program, carbon fiber and thermal expansion graphene are as conductive filler, on the one hand, above two material is that height is led
Electric material, on the other hand, in the substrate, which can contact with each other and then construct three-dimensional conductive grid, avoid being insulated
Substrate surround, along with the modification of thermal expansion graphene, good effectiveness can be played.In addition, pass through control
The size of carbon fiber, unexpected beneficial effect is generated for absorbing property.
Preferably, in above-mentioned magnetic fillers, the carbonyl iron dust is spherical for 10 μm of particle diameter.
Magnetic fillers prevent electromagnetic wave from passing through such as eddy-current loss, nature mainly by way of electromagnetic wave absorption
Resonance and magnetic hystersis loss etc., common magnetic fillers have ferrite, metal fine powder and carbonyl iron etc.；In technical solution of the present invention,
Carbonyl iron dust, nickel-copper ferrite composite nano materials are used, by quality proportioning and size Control, to generate meaning for magnetic fillers
Technique effect unexpectedly so that composite wave-suction material of the present invention has good electromagnetic wave absorption effect, with reference to above-mentioned
Conductive filler so that composite wave-suction material of the present invention has good effectiveness in wider frequency range.
With reference to Fig. 1, broadband composite wave-suction material of the invention is prepared according to following steps：
Step 1, thermal expansion graphene is prepared
First, graphene oxide is prepared using method in the prior art, then, powdered graphene oxide is placed on not
Become rusty in steel box, which is placed in 56s in 1100 DEG C of Muffle furnace, further takes out and is cooled to room temperature, obtains thermal expansion stone
Black alkene；
Step 2, nickel-copper ferrite composite nano materials are prepared
Configure molar ratio 2:2:1:1 CuSO4·5H2O、NiSO4·7H2O、FeCl3·6H2O、FeSO4·6H2O's is water-soluble
Liquid 100ml, magnetic agitation 1h, is then slowly added to NaOH aqueous solutions, until the pH value of mixed solution reaches 11.4, then will be mixed
Close solution to pour into reaction kettle, 6h is kept at 180 DEG C, product deionized water and ethanol eccentric cleaning must gather after dry
Aniline/nickel-copper ferrite composite nano materials；
Step 3, broadband composite wave-suction material is prepared
Take thermal expansion graphene, carbon fiber, carbonyl iron dust, nickel-copper ferrite composite nano materials, epoxy resin, methyl six
Hydrogen phthalic anhydride, DMP30, are added in Centrifuge Cup, and Centrifuge Cup then is placed in planetary vacuum stirring deaeration machine, and traditional vacuum stirs
Deaeration 15min is mixed, Centrifuge Cup is taken out, then mixture in Centrifuge Cup is poured into mould, mould is placed in baking oven, 80 DEG C
Cure 6h, 100 DEG C of curing 4h, 130 DEG C of curing 2h, after mould is cooled to room temperature, sample are taken out and is cut to suitable dimension, i.e.,
Obtain broadband composite wave-suction material of the present invention.
Embodiment 1
In the present embodiment, a kind of broadband composite wave-suction material containing thermal expansion graphene, the composite wave-suction material with
Epoxy resin is substrate, using thermal expansion graphene, carbon fiber, carbonyl iron dust, nickel-copper ferrite composite nano materials as filler, is led to
Vacuum defoamation paddling process to be crossed to be made, uniform filling is distributed in the substrate, wherein, the thermal expansion graphene, carbon fiber are conduction
Filler, content are respectively 2wt%, 4wt%, and the carbonyl iron dust, nickel-copper ferrite composite nano materials are magnetic fillers, content
Respectively 19wt%, 14wt%.
In above-mentioned conductive filler, the length of the carbon fiber is 800 μm, a diameter of 50 μm.
In above-mentioned magnetic fillers, the carbonyl iron dust is spherical for 10 μm of particle diameter.
The broadband composite wave-suction material of the present invention is prepared according to following steps：
Step 1, thermal expansion graphene is prepared
First, graphene oxide is prepared using method in the prior art, then, powdered graphene oxide is placed on not
Become rusty in steel box, which is placed in 56s in 1100 DEG C of Muffle furnace, further takes out and is cooled to room temperature, obtains thermal expansion stone
Black alkene；
Step 2, nickel-copper ferrite composite nano materials are prepared
Configure molar ratio 2:2:1:1 CuSO4·5H2O、NiSO4·7H2O、FeCl3·6H2O、FeSO4·6H2O's is water-soluble
Liquid 100ml, magnetic agitation 1h, is then slowly added to NaOH aqueous solutions, until the pH value of mixed solution reaches 11.4, then will be mixed
Close solution to pour into reaction kettle, 6h is kept at 180 DEG C, product deionized water and ethanol eccentric cleaning must gather after dry
Aniline/nickel-copper ferrite composite nano materials；
Step 3, broadband composite wave-suction material is prepared
Take thermal expansion graphene, carbon fiber, carbonyl iron dust, nickel-copper ferrite composite nano materials, epoxy resin, methyl six
Hydrogen phthalic anhydride, DMP30, are added in Centrifuge Cup, and Centrifuge Cup then is placed in planetary vacuum stirring deaeration machine, and traditional vacuum stirs
Deaeration 15min is mixed, Centrifuge Cup is taken out, then mixture in Centrifuge Cup is poured into mould, mould is placed in baking oven, 80 DEG C
Cure 6h, 100 DEG C of curing 4h, 130 DEG C of curing 2h, after mould is cooled to room temperature, sample are taken out and is cut to suitable dimension, i.e.,
Obtain broadband composite wave-suction material of the present invention.
Embodiment 2
In the present embodiment, a kind of broadband composite wave-suction material containing thermal expansion graphene, the composite wave-suction material with
Epoxy resin is substrate, using thermal expansion graphene, carbon fiber, carbonyl iron dust, nickel-copper ferrite composite nano materials as filler, is led to
Vacuum defoamation paddling process to be crossed to be made, uniform filling is distributed in the substrate, wherein, the thermal expansion graphene, carbon fiber are conduction
Filler, content are respectively 4wt%, 7wt%, and the carbonyl iron dust, nickel-copper ferrite composite nano materials are magnetic fillers, content
Respectively 15wt%, 12wt%.
In above-mentioned conductive filler, the length of the carbon fiber is 800 μm, a diameter of 50 μm.
In above-mentioned magnetic fillers, the carbonyl iron dust is spherical for 10 μm of particle diameter.
The broadband composite wave-suction material of the present invention is prepared according to following steps：
Step 1, thermal expansion graphene is prepared
First, graphene oxide is prepared using method in the prior art, then, powdered graphene oxide is placed on not
Become rusty in steel box, which is placed in 56s in 1100 DEG C of Muffle furnace, further takes out and is cooled to room temperature, obtains thermal expansion stone
Black alkene；
Step 2, nickel-copper ferrite composite nano materials are prepared
Configure molar ratio 2:2:1:1 CuSO4·5H2O、NiSO4·7H2O、FeCl3·6H2O、FeSO4·6H2O's is water-soluble
Liquid 100ml, magnetic agitation 1h, is then slowly added to NaOH aqueous solutions, until the pH value of mixed solution reaches 11.4, then will be mixed
Close solution to pour into reaction kettle, 6h is kept at 180 DEG C, product deionized water and ethanol eccentric cleaning must gather after dry
Aniline/nickel-copper ferrite composite nano materials；
Step 3, broadband composite wave-suction material is prepared
Take thermal expansion graphene, carbon fiber, carbonyl iron dust, nickel-copper ferrite composite nano materials, epoxy resin, methyl six
Hydrogen phthalic anhydride, DMP30, are added in Centrifuge Cup, and Centrifuge Cup then is placed in planetary vacuum stirring deaeration machine, and traditional vacuum stirs
Deaeration 15min is mixed, Centrifuge Cup is taken out, then mixture in Centrifuge Cup is poured into mould, mould is placed in baking oven, 80 DEG C
Cure 6h, 100 DEG C of curing 4h, 130 DEG C of curing 2h, after mould is cooled to room temperature, sample are taken out and is cut to suitable dimension, i.e.,
Obtain broadband composite wave-suction material of the present invention.
Embodiment 3
In the present embodiment, a kind of broadband composite wave-suction material containing thermal expansion graphene, the composite wave-suction material with
Epoxy resin is substrate, using thermal expansion graphene, carbon fiber, carbonyl iron dust, nickel-copper ferrite composite nano materials as filler, is led to
Vacuum defoamation paddling process to be crossed to be made, uniform filling is distributed in the substrate, wherein, the thermal expansion graphene, carbon fiber are conduction
Filler, content are respectively 2wt%, 4wt%, and the carbonyl iron dust, nickel-copper ferrite composite nano materials are magnetic fillers, content
Respectively 19wt%, 14wt%.
In above-mentioned conductive filler, the length of the carbon fiber is 400 μm, a diameter of 10 μm.
In above-mentioned magnetic fillers, the carbonyl iron dust is spherical for 10 μm of particle diameter.
The broadband composite wave-suction material of the present invention is prepared according to following steps：
Step 1, thermal expansion graphene is prepared
First, graphene oxide is prepared using method in the prior art, then, powdered graphene oxide is placed on not
Become rusty in steel box, which is placed in 56s in 1100 DEG C of Muffle furnace, further takes out and is cooled to room temperature, obtains thermal expansion stone
Black alkene；
Step 2, nickel-copper ferrite composite nano materials are prepared
Configure molar ratio 2:2:1:1 CuSO4·5H2O、NiSO4·7H2O、FeCl3·6H2O、FeSO4·6H2O's is water-soluble
Liquid 100ml, magnetic agitation 1h, is then slowly added to NaOH aqueous solutions, until the pH value of mixed solution reaches 11.4, then will be mixed
Close solution to pour into reaction kettle, 6h is kept at 180 DEG C, product deionized water and ethanol eccentric cleaning must gather after dry
Aniline/nickel-copper ferrite composite nano materials；
Step 3, broadband composite wave-suction material is prepared
Take thermal expansion graphene, carbon fiber, carbonyl iron dust, nickel-copper ferrite composite nano materials, epoxy resin, methyl six
Hydrogen phthalic anhydride, DMP30, are added in Centrifuge Cup, and Centrifuge Cup then is placed in planetary vacuum stirring deaeration machine, and traditional vacuum stirs
Deaeration 15min is mixed, Centrifuge Cup is taken out, then mixture in Centrifuge Cup is poured into mould, mould is placed in baking oven, 80 DEG C
Cure 6h, 100 DEG C of curing 4h, 130 DEG C of curing 2h, after mould is cooled to room temperature, sample are taken out and is cut to suitable dimension, i.e.,
Obtain broadband composite wave-suction material of the present invention.
Embodiment 4
In the present embodiment, a kind of broadband composite wave-suction material containing thermal expansion graphene, the composite wave-suction material with
Epoxy resin is substrate, using thermal expansion graphene, carbon fiber, carbonyl iron dust, nickel-copper ferrite composite nano materials as filler, is led to
Vacuum defoamation paddling process to be crossed to be made, uniform filling is distributed in the substrate, wherein, the thermal expansion graphene, carbon fiber are conduction
Filler, content are respectively 2wt%, 4wt%, and the carbonyl iron dust, nickel-copper ferrite composite nano materials are magnetic fillers, content
Respectively 19wt%, 14wt%.
In above-mentioned conductive filler, the length of the carbon fiber is 800 μm, a diameter of 50 μm.
In above-mentioned magnetic fillers, the carbonyl iron dust is spherical for 30 μm of particle diameter.
The broadband composite wave-suction material of the present invention is prepared according to following steps：
Step 1, thermal expansion graphene is prepared
First, graphene oxide is prepared using method in the prior art, then, powdered graphene oxide is placed on not
Become rusty in steel box, which is placed in 56s in 1100 DEG C of Muffle furnace, further takes out and is cooled to room temperature, obtains thermal expansion stone
Black alkene；
Step 2, nickel-copper ferrite composite nano materials are prepared
Configure molar ratio 2:2:1:1 CuSO4·5H2O、NiSO4·7H2O、FeCl3·6H2O、FeSO4·6H2O's is water-soluble
Liquid 100ml, magnetic agitation 1h, is then slowly added to NaOH aqueous solutions, until the pH value of mixed solution reaches 11.4, then will be mixed
Close solution to pour into reaction kettle, 6h is kept at 180 DEG C, product deionized water and ethanol eccentric cleaning must gather after dry
Aniline/nickel-copper ferrite composite nano materials；
Step 3, broadband composite wave-suction material is prepared
Take thermal expansion graphene, carbon fiber, carbonyl iron dust, nickel-copper ferrite composite nano materials, epoxy resin, methyl six
Hydrogen phthalic anhydride, DMP30, are added in Centrifuge Cup, and Centrifuge Cup then is placed in planetary vacuum stirring deaeration machine, and traditional vacuum stirs
Deaeration 15min is mixed, Centrifuge Cup is taken out, then mixture in Centrifuge Cup is poured into mould, mould is placed in baking oven, 80 DEG C
Cure 6h, 100 DEG C of curing 4h, 130 DEG C of curing 2h, after mould is cooled to room temperature, sample are taken out and is cut to suitable dimension, i.e.,
Obtain broadband composite wave-suction material of the present invention.
Preferably, such as following table, the reflection for being the composite wave-suction material that is obtained to above-described embodiment in 2~20GHz frequency ranges
Loss：
| 2(Hz) | 6(Hz) | 10(Hz) | 14(Hz) | 18(Hz) | 20(Hz) | |
| Embodiment 1 | -27.6dB | -28.7dB | -32.4dB | -34.5dB | -32.1dB | -27.4dB |
| Embodiment 2 | -2.1dB | -5.6dB | -14.2dB | -18.4dB | -5.3dB | -2.6dB |
| Embodiment 3 | -7.9dB | -18.3dB | -12.4dB | -15.3dB | -6.1dB | -7.4dB |
| Embodiment 4 | -4.7dB | -7.1dB | -12.9dB | -13.6dB | -12.3dB | -7.7dB |
Seen by upper table, in embodiment 1, which is respectively provided with for the electromagnetic wave in 2~20GHz frequency ranges
Good absorbing property, maximum absorption 34.5dB, and suction intensity of wave uniformity is preferable in the frequency range, average absorption amount
For 30.5dB, unexpected technique effect is achieved, multiple elements design absorbing material performance significantly improves, moreover, having density
Low, light weight, inhale the advantages of wave frequency bandwidth.
In embodiment 2,3,4, by varying filer content, carbon fiber size, carbonyl iron dust size, the composite wave-suction material
Decline for the absorbing property of electromagnetic wave, inhale wave frequency band and narrow.
The foregoing is merely the preferred mode of the present invention, it is not intended to limit the invention, it is all in the spiritual and former of the present invention
Within then, any modification, equivalent replacement, improvement and so on, should all be included in the protection scope of the present invention.
Claims (6)
1. a kind of broadband composite wave-suction material containing thermal expansion graphene, it is characterised in that the composite wave-suction material is with ring
Oxygen tree fat is substrate, using thermal expansion graphene, carbon fiber, carbonyl iron dust, nickel-copper ferrite composite nano materials as filler, is passed through
Vacuum defoamation paddling process is made, and uniform filling is distributed in the substrate.
2. absorbing material according to claim 1, it is characterised in that the thermal expansion graphene, carbon fiber are filled out for conduction
Material, content is respectively 2wt%, 4wt%.
3. absorbing material according to claim 2, it is characterised in that the length of the carbon fiber is 800 μm, a diameter of 50 μ
m。
4. absorbing material according to claim 1, it is characterised in that the carbonyl iron dust, nickel-copper ferrite composite Nano
Material is magnetic fillers, and content is respectively 19wt%, 14wt%.
5. absorbing material according to claim 4, it is characterised in that the carbonyl iron dust is spherical for 10 μm of particle diameter.
6. absorbing material according to claim 1, it is characterised in that the absorbing material is prepared according to following steps：
Step 1, thermal expansion graphene is prepared
First, graphene oxide is prepared using method in the prior art, then, powdered graphene oxide is placed on stainless steel
In box, which is placed in 56s in 1100 DEG C of Muffle furnace, further takes out and is cooled to room temperature, obtains thermal expansion graphene；
Step 2, nickel-copper ferrite composite nano materials are prepared
Configure molar ratio 2:2:1:1 CuSO4·5H2O、NiSO4·7H2O、FeCl3·6H2O、Fe SO4·6H2The aqueous solution of O
100ml, magnetic agitation 1h, is then slowly added to NaOH aqueous solutions, until the pH value of mixed solution reaches 11.4, then will mixing
Solution is poured into reaction kettle, and 6h is kept at 180 DEG C, and by product deionized water and ethanol eccentric cleaning, polyphenyl is obtained after dry
Amine/nickel-copper ferrite composite nano materials；
Step 3, broadband composite wave-suction material is prepared
Take thermal expansion graphene, carbon fiber, carbonyl iron dust, nickel-copper ferrite composite nano materials, epoxy resin, methyl hexahydrobenzene
Acid anhydride, DMP30, are added in Centrifuge Cup, and Centrifuge Cup then is placed in planetary vacuum stirring deaeration machine, and traditional vacuum stirring is de-
15min is steeped, Centrifuge Cup is taken out, then mixture in Centrifuge Cup is poured into mould, mould is placed in baking oven, 80 DEG C of curings
6h, 100 DEG C of curing 4h, 130 DEG C of curing 2h, after mould are cooled to room temperature, sample are taken out and is cut to suitable dimension, up to institute
State broadband composite wave-suction material.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109265927A (en) * | 2018-09-21 | 2019-01-25 | 佛山皖和新能源科技有限公司 | A kind of epoxy resin electromagnetic shielding material |
| CN110499027A (en) * | 2018-05-18 | 2019-11-26 | 深圳市永恒能源科技有限公司 | A kind of anti-radiation wave absorbing material and preparation method thereof |
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| CN109265927A (en) * | 2018-09-21 | 2019-01-25 | 佛山皖和新能源科技有限公司 | A kind of epoxy resin electromagnetic shielding material |
| CN113436824A (en) * | 2021-07-07 | 2021-09-24 | 上海圣石生物医学科技有限公司 | Magnetic wave-absorbing material, preparation method, application and health-care product thereof |
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