CN106564227A - Polymer/graphene foamed material with electromagnetic shielding performance, and preparation method and application thereof - Google Patents
Polymer/graphene foamed material with electromagnetic shielding performance, and preparation method and application thereof Download PDFInfo
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- CN106564227A CN106564227A CN201610919451.4A CN201610919451A CN106564227A CN 106564227 A CN106564227 A CN 106564227A CN 201610919451 A CN201610919451 A CN 201610919451A CN 106564227 A CN106564227 A CN 106564227A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
- B32B2307/212—Electromagnetic interference shielding
Abstract
The invention discloses a polymer/graphene foamed material with electromagnetic shielding performance, and a preparation method and an application thereof. The method is characterized in that a thermoplastic polymer/graphene micro-foamed film is produced mainly by using a solution blending and phase separation technology, and the thermoplastic polymer/graphene micro-foamed film and a wave transmitting material are bonded by glue to form the integral material with a sandwich structure. The polymer/graphene foamed material has good application prospect in the electromagnetic shielding field.
Description
Technical field
The invention belongs to polymer matrix electromagnetic shielding material field, more particularly to a kind of polymerization with capability of electromagnetic shielding
Thing/Graphene expanded material and preparation method and application.
Background technology
Electromagnetic Interference refers to that harmful electromagnetic wave makes the normal function of electronic device be interfered or cause the showing of obstacle
As, abbreviation EMI (electromagnetic interference), refer to radio wave, magnetic wave, light wave, sunspot and its
It some from space natural disturbance.With the fast development of modern electronics industry, various wireless communication systems and high-frequency electrical
Sharply increasing for sub- number of devices, result in increasing for electromagnetic interference phenomenon outstanding day by day with electromagnetic pollution problem.On the one hand,
Electromagnetic radiation can cause severe jamming to the electronic equipment of surrounding, make their working procedure get muddled, and produce mistake
Action；Also, electromagenetic wave radiation can cause information leakage, the information security of the instruments such as computer is made to be subject to serious impact.It is existing
Not only there is interference to electronic device in discovery electromagnetic radiation, harm can also be produced to human body.The disease incidences such as cancer, leukemia
The increase of raising and electromagnetic radiation have certain relation.At present, how international organization and national governments, scientific research circle etc. are to prevent
Electromagnetic Interference gives great attention, and has formulated strict regulation and carry out trapped electromagnetic wave radiation capacity.Therefore, explore efficient
Electromagnetic shielding material, prevents electromagnetic radiation pollution with environmental protection and health, it has also become problem in the urgent need to address.
The most frequently used effective method of preventing and treating electromagnetic radiation is for harmful electromagnetic wave is shielded using electromagnetic shielding material
Cover.Therefore exploitation High Performance Shielding material is significant.The definition of material electromagnet shield effect is incident electromagnetic wave
Intensity and transmitted electromagnetic wave intensity rate logarithm, unit is dB.Electromagnet shield effect numerical value is higher to mean fewer electricity
Magnetic wave can penetrate shielding material.For example, the minimum electromagnet shield effect that business application is required is 20dB, it is meant that only 1%
Electromagnetic wave can penetrate shielding material.
There is the shortcomings of high perishable, density, difficult processing in traditional Metal Substrate shielding material, polyurethane/material with carbon element is combined
Electromagnetic shielding material have corrosion-resistant, low-density, easy processing, it is flexible the features such as, the encapsulant being commonly used for inside shield.
Foaming structure is introduced in such material internal can further reduce its density and processing cost.Meanwhile, foam structure can be with
Induction electromagnetic wave carries out multipath reflection and scattering in material internal, increases its absorption to electromagnetic wave, and this makes answering for such material
The fields such as microwave dark room are extended to scope.
However, most polymer foams are mainly by the conductive filler (10- of addition high-load at present
76wt.%) reaching industrialized standard (shield effectiveness is not less than 20dB), such as document：J.Mater.Chem.,2012,22,
18772-18774；ACS Appl.Mater.Interfaces,2013,5,2677-2684；Adv.Funct.Mater.2016,
26,303-310.As a result, too high conductive filler greatly improved the viscosity of polymer solution or melt, to follow-up processing and
Foaming process brings great difficulty.
The content of the invention
It is an object of the invention to provide polymer/graphene expanded material with capability of electromagnetic shielding and preparation method thereof
And application, the extensive preparation of polymer matrix composite foam material can be realized using the method, applied with good market
Prospect.
A kind of preparation method of the polymer/graphene expanded material with capability of electromagnetic shielding, including：
(1) disperse graphene in organic solvent, mixed solution is obtained after adding polymer stirring and dissolving, by mixed solution
Pouring scraper into carries out film and is separated, and is dried, obtains polymer/graphene fretting map thin film；
(2) the polymer/graphene fretting map thin film obtained in step (1) is laminated with electromagnetic wave transparent material, is used glue
The polymer/graphene expanded material with sandwich structure is formed after bonding.
It is thin that the present invention prepares the polymer/graphene fretting map that Graphene content is 4～16wt.% by phase separation method
Film, these thin film are further carried out with electromagnetic wave transparent material it is compound prepare the integrated material with sandwich structure can be significantly
Improve its capability of electromagnetic shielding.
In step (1), the Graphene is the grapheme material prepared using various methods, including by ball-milling method, micro-
Grapheme material, chemistry redox method and chemical gaseous phase depositing process life that machinery or supercritical fluid stripping means are obtained
One or more in the grapheme material that length is obtained.
In step (1), the phase separation includes：By mixed solution pour into scraper carry out film and be exposed to temperature for 10～
100 DEG C and relative humidity are to carry out in the environment of 20～99%；The time of the phase separation is 0.1～24h.
During the polymer is polyurethane, Polyetherimide, polyimides, polymethyl methacrylate and polystyrene
It is at least one.
The organic solvent be N, N'- dimethylformamides (DMF), N, N'- dimethyl acetylamide (DMAc), tetrahydrofuran
(THF) and in dimethyl sulfoxide (DMSO) one or two.
In the mixed solution, the mass ratio of the Graphene, polymer and organic solvent is 1～4：21～24：100～
250。
The abscess-size of the polymer/graphene fretting map thin film be 1～10 μm, thickness be 0.1～3.0mm, density
For 0.2～0.5g/cm3。
In the polymer/graphene fretting map thin film, by mass percentage, the ratio shared by Graphene be 4～
16wt.%.As the application composite foaming process is mainly completed by being separated, the process of phase separation is polymer
The process that solvent is exchanged with each other with its non-solvent, and the addition of the Graphene of high loading can affect but solvent will not be prevented molten with non-
The exchange process of agent.Therefore, when Graphene content is up to 16wt.%, polymer composites still can foam, so as to make
It is standby go out high Graphene content polymer/graphene fretting map thin film.
The outer layer of the polymer/graphene expanded material with sandwich structure is by 1～100 layer graphene content phase
Same or different polymer/graphene fretting map thin film is laminated, and intermediate course is laminated by electromagnetic wave transparent material.
The outer layer thickness of the polymer/graphene expanded material with sandwich structure is 0.1～300mm；It is middle
Thickness of interlayer is 1～100mm.The thickness of intermediate course can affect coherent superposition of the incident electromagnetic wave between outer layer shield,
And then affect the incrementss of composite shielding propertiess.Preferably, intermediate course thickness is 1～15mm.
The electromagnetic wave transparent material is the polystyrene foam of commercialization, polyurethane foam, polypropylene foam, polyimides bubble
At least one in foam, melamine foamed plastic and sponge is laminated, because the number of plies of electromagnetic wave transparent material is to prepared polymer/stone
The final shielding propertiess of black alkene expanded material affect to ignore, so to the number of plies of electromagnetic wave transparent material without particular provisions.
The glue is one or more in PU glue, epoxy glue and UV- glue.
Present invention also offers a kind of polymer/graphene expanded material with capability of electromagnetic shielding, the polymer/
Graphene expanded material is prepared by above-mentioned method.
Present invention also offers a kind of application of the polymer/graphene expanded material with capability of electromagnetic shielding, specifically
For application of the polymer/graphene expanded material in electromagnetic shielding field.
Compared with prior art, the present invention has following features：
(1) realize high-load filling and controllability of the Graphene in polymer composite foam material to prepare；
(2) sandwich structure is combined with foaming structure, is significantly carried in the case where more screeners need not be added
, to shielding electromagnetic waves efficiency, the method is with low cost, simple to operate, it is easy to industrialization large-scale production for high shielding material,
With good market application foreground.
Description of the drawings
Fig. 1 is the polymer/graphene expanded material that the Graphene content prepared by the embodiment of the present invention 1 is 8wt.%
Transverse section scanning electron microscope (SEM) photograph；
Fig. 2 is the polymer/graphene expanded material with sandwich structure and the contrast prepared by the embodiment of the present invention 1
Shield effectiveness comparison diagram of the composite prepared by example 1 in Ku wave bands (12-18GHz)；
Fig. 3 is the polymer/graphene expanded material with sandwich structure and the contrast prepared by the embodiment of the present invention 2
Shield effectiveness comparison diagram of the composite prepared by example 2 in Ku wave bands；
Fig. 4 is the polymer/graphene expanded material with sandwich structure and the contrast prepared by the embodiment of the present invention 3
Shield effectiveness comparison diagram of the composite prepared by example 3 in Ku wave bands；
Fig. 5 is the polymer/graphene expanded material with sandwich structure and the contrast prepared by the embodiment of the present invention 4
Shield effectiveness comparison diagram of the composite prepared by example 4 in Ku wave bands.
Specific embodiment
With reference to the accompanying drawings and examples the present invention is specifically described.
Embodiment 1
(1) Graphene of 0.63g is added in 100mL DMF, ultrasonic disperse 5 minutes.Then, add 15g's wherein
Polyurethane particles, after high-speed stirred dissolving, by mixed solution, which is poured in the slot scraping of scraper and is applied on clean glass plate
Film.After the completion of, put temperature for 25 DEG C, relative humidity be 78% constant temperature and humidity stove in 5h.Finally, the material for obtaining is put
Process is dried in vacuum drying oven, polyurethane/Graphene fretting map thin film that Graphene content is 4wt.% is obtained.
Additionally, Graphene content for 8wt.% and 16wt.% polyurethane/Graphene fretting map thin film also by same
Method is prepared.Wherein, Graphene content for 8wt.% polyurethane/Graphene fretting map thin film transverse section shape appearance figure such as
Shown in Fig. 1, about 5 μm of its average cell size.Additionally, the design parameter of the thickness and constant temperature and humidity stove by adjusting scraper can
Accuracy controlling is carried out with the thickness and abscess pattern to the polyurethane/Graphene fretting map thin film.
(2) in selecting step (1), Graphene content is thin for the two kinds of polyurethane/Graphene fretting map of 4wt.% and 8wt.%
The polystyrene foam of film and commercialization is used as material, and is 2.1,6.5 and three kinds of monolayer polystyrene of 13.0mm by thickness
Foam is clipped between above two monolayer polyurethane/Graphene fretting map thin film respectively, and interlayer glue carries out bonding and forms three
Plant the polymer/graphene expanded material of the integration with sandwich structure.
Comparative example 1
Polyurethane/Graphene fretting map thin film of the two layer graphene contents for 4wt.% and 8wt.% is glued with glue
Knot.
Four kinds of composites that embodiment 1 and comparative example 1 are obtained are carried out into electromagnetic wave shielding using vector network analyzer
Can test, as a result as shown in Figure 2.As a result show：When the thickness of polystyrene foam interlayer is 2.1mm, tie with sandwich
Shield effectiveness of the composite of structure in Ku wave bands is 17～19dB, and the composite in comparative example 1 is in the screen of the frequency range
It is only 13～17dB to cover efficiency；When thickness of interlayer increases to 6.5mm, the composite with sandwich structure is in Ku wave bands
Shield effectiveness increases to 22～24dB, improves 41～69% compared with comparative example 1 and has reached the 20dB required by industrial standard；Enter one
Step increases its thickness to 13.0mm, and the shield effectiveness of the composite with sandwich structure is only carried out in the range of 13～24dB
Change and have larger fluctuation.
Embodiment 2
It is 8wt.% and 16wt.% that material therefor in the present embodiment is prepared Graphene content in embodiment 1
Polyurethane/Graphene fretting map thin film and polystyrene foam.
By thickness be 2.1,6.5 and three kinds of monolayer polystyrene foams of 13.0mm are clipped in the poly- ammonia of above two monolayer respectively
Between ester/Graphene fretting map thin film, interlayer is bondd with glue, forms the poly- of three kinds of integrations with sandwich structure
Compound/Graphene expanded material.
Comparative example 2
Polyurethane/Graphene fretting map thin film of the two layer graphene contents for 8wt.% and 16wt.% is carried out with glue
Bonding.
Four kinds of composites that embodiment 2 and comparative example 2 are obtained are carried out into electromagnetic wave shielding using vector network analyzer
Can test, as a result as shown in Figure 3.As a result show：When the thickness of polystyrene foam interlayer is 2.1mm, tie with sandwich
Shield effectiveness of the composite of structure in Ku wave bands is 22～29dB, and the composite in comparative example 2 is in the screen of the frequency range
It is only 18～24dB to cover efficiency；When thickness of interlayer increases to 6.5mm, the composite with sandwich structure is in Ku wave bands
Shield effectiveness increases to 24～33dB, improves 33～38% compared with comparative example 2；Further increase thickness of interlayer to 13.0mm, have
The shield effectiveness of the composite of sandwich structure is only changed in the range of 18～33dB and has larger fluctuation.
The result of integrated embodiment 1 and 2 understands, when wave transparent thickness of interlayer is 6.5mm, obtain with sandwich structure
The electromagnet shield effect of polymer/graphene foamed materialss is optimal, and it is electricity in institute's frequency measurement section (Ku wave bands) that the thickness value is corresponding
The a quarter of the maximum of magnetic wave wavelength, i.e., the polymer/graphene expanded material electromagnetic shielding effect with sandwich structure
Thickness of the incrementss of energy depending on wherein wave transparent interlayer, and the value of the thickness and the four of institute's frequency measurement section electromagnetic wavelength maximum
/ mono- is relevant.So, in following examples, the thickness of wave transparent interlayer is all tested as preference using 6.5mm.
Embodiment 3
Material therefor in the present embodiment is prepared Graphene content in embodiment 1 for the polyurethane/stone of 8wt.%
Black alkene fretting map thin film and polystyrene foam.
Specific practice is that the polystyrene foam by a layer thickness for 6.5mm is clipped in two layer graphene contents for 8wt.% stones
Polyurethane/Graphene fretting map thin film between, interlayer is bondd with glue, forms a kind of one with sandwich structure
The polymer/graphene expanded material of change.
Comparative example 3
Polyurethane/Graphene fretting map thin film of the two-layer identical Graphene content for 8wt.% is bondd.
Two kinds of composites that embodiment 3 and comparative example 3 are obtained are carried out into electromagnetic wave shielding using vector network analyzer
Can test, as a result as shown in Figure 4.As a result show：Composite with sandwich structure (i.e. embodiment 3) is in Ku wave bands
Shield effectiveness is between 23～29dB, and shield effectiveness of the composite that comparative example 3 is obtained in Ku wave bands is only 17～20dB.
Embodiment 4
Material therefor in the present embodiment is prepared Graphene content in embodiment 1 for the polyurethane/stone of 16wt.%
Black alkene fretting map thin film and polystyrene foam.
Specific practice is that the polystyrene foam by a layer thickness for 6.5mm is clipped in two layer graphene contents for 16wt.%
Polyurethane/Graphene fretting map thin film between, interlayer is bondd with glue, forms a kind of one with sandwich structure
The polymer/graphene expanded material of change.
Comparative example 4
Polyurethane/Graphene fretting map thin film of the two-layer identical Graphene content for 16wt.% is bondd.
Two kinds of composites that embodiment 4 and comparative example 4 are obtained are carried out into electromagnetic wave shielding using vector network analyzer
Can test, as a result as shown in Figure 5.As a result show：Composite with sandwich structure (i.e. embodiment 4) is in Ku wave bands
Shield effectiveness is between 32～45dB, and shield effectiveness of the composite that comparative example 4 is obtained in Ku wave bands is only 22～32dB.
Claims (10)
1. a kind of preparation method of the polymer/graphene expanded material with capability of electromagnetic shielding, it is characterised in that include：
(1) disperse graphene in organic solvent, mixed solution is obtained after adding polymer stirring and dissolving, mixed solution is poured into
Scraper carries out film and is separated, and is dried, obtains polymer/graphene fretting map thin film；
(2) the polymer/graphene fretting map thin film obtained in step (1) is laminated with electromagnetic wave transparent material, is used glue bonding
The polymer/graphene expanded material with sandwich structure is formed afterwards.
2. the preparation method of the polymer/graphene expanded material with capability of electromagnetic shielding according to claim 1, its
It is characterised by, in step (1), the phase separation includes：Pouring mixed solution into scraper carries out film and is exposed to temperature for 10
～100 DEG C and relative humidity are to carry out in the environment of 20～99%；The time of the phase separation is 0.1～24h.
3. the preparation method of the polymer/graphene expanded material with capability of electromagnetic shielding according to claim 1, its
It is characterised by, during the polymer is polyurethane, Polyetherimide, polyimides, polymethyl methacrylate and polystyrene
At least one.
4. the preparation method of the polymer/graphene expanded material with capability of electromagnetic shielding according to claim 1, its
It is characterised by, in the mixed solution, the mass ratio of the Graphene, polymer and organic solvent is 1～4：21～24：100
～250.
5. the preparation method of the polymer/graphene expanded material with capability of electromagnetic shielding according to claim 1, its
It is characterised by, the thickness of the polymer/graphene fretting map thin film is 0.1～3.0mm, and density is 0.2～0.5g/cm3。
6. the preparation method of the polymer/graphene expanded material with capability of electromagnetic shielding according to claim 1, its
It is characterised by, the outer layer of the polymer/graphene expanded material with sandwich structure is by 1～100 layer graphene content
Identical or different polymer/graphene fretting map thin film is laminated, and intermediate course is laminated by electromagnetic wave transparent material.
7. the preparation method of the polymer/graphene expanded material with capability of electromagnetic shielding according to claim 6, its
It is characterised by, the outer layer thickness of the polymer/graphene expanded material with sandwich structure is 0.1～300mm；It is middle
Thickness of interlayer is 1～100mm.
8. the preparation method of the polymer/graphene expanded material with capability of electromagnetic shielding according to claim 6, its
It is characterised by, the electromagnetic wave transparent material is polystyrene foam, polyurethane foam, polypropylene foam, polyimide foam, melamine
At least one in amine foam and sponge is laminated.
9. a kind of polymer/graphene expanded material with capability of electromagnetic shielding, it is characterised in that the polymer/graphite
Method of the alkene expanded material according to any one of claim 1～9 is prepared.
10. a kind of application of the polymer/graphene expanded material with capability of electromagnetic shielding, it is characterised in that the polymerization
Thing/application of the Graphene expanded material in electromagnetic shielding field.
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| CN107226924A (en) * | 2017-06-28 | 2017-10-03 | 徐昌霞 | A kind of microporous foam polyimides base electro-magnetic screen composite material and preparation method thereof |
| CN108192211A (en) * | 2017-12-30 | 2018-06-22 | 杭州高烯科技有限公司 | A kind of preparation method of graphene-polypropylene composite materials expanded material |
| CN109438988A (en) * | 2018-11-06 | 2019-03-08 | 四川大学 | A kind of composite elastic body foamed material and preparation method thereof |
| CN109526191A (en) * | 2018-10-15 | 2019-03-26 | 华中科技大学 | A kind of graphene-based electromagnetic shielding composite material |
| CN110404544A (en) * | 2019-07-26 | 2019-11-05 | 华东理工大学 | A kind of bimetallic catalytic material and its preparation method and application method |
| CN110511556A (en) * | 2019-08-30 | 2019-11-29 | 合肥工业大学 | A kind of porous light polyurethane electromagnetic shielding composite material and preparation method thereof of electromagnetism collaboration enhancing |
| CN110791079A (en) * | 2019-10-18 | 2020-02-14 | 蔡娟 | Co3O4-composite electromagnetic shielding material of carbon nano tube modified polyurethane |
| CN112094426A (en) * | 2020-09-16 | 2020-12-18 | 江南大学 | Impedance gradual change type graphene-based polyimide composite foam wave-absorbing material |
| CN112969356A (en) * | 2021-01-19 | 2021-06-15 | 西安理工大学 | Preparation method of polyurethane/graphene nanosheet/sponge composite material |
| CN114437396A (en) * | 2021-12-31 | 2022-05-06 | 安徽工业大学 | Electromagnetic shielding composite foam with sandwich structure and preparation method thereof |
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| CN107226924A (en) * | 2017-06-28 | 2017-10-03 | 徐昌霞 | A kind of microporous foam polyimides base electro-magnetic screen composite material and preparation method thereof |
| CN108192211A (en) * | 2017-12-30 | 2018-06-22 | 杭州高烯科技有限公司 | A kind of preparation method of graphene-polypropylene composite materials expanded material |
| CN109526191A (en) * | 2018-10-15 | 2019-03-26 | 华中科技大学 | A kind of graphene-based electromagnetic shielding composite material |
| CN109438988A (en) * | 2018-11-06 | 2019-03-08 | 四川大学 | A kind of composite elastic body foamed material and preparation method thereof |
| CN110404544A (en) * | 2019-07-26 | 2019-11-05 | 华东理工大学 | A kind of bimetallic catalytic material and its preparation method and application method |
| CN110404544B (en) * | 2019-07-26 | 2022-04-26 | 华东理工大学 | Bimetallic catalytic material and preparation method and application method thereof |
| CN110511556B (en) * | 2019-08-30 | 2021-05-04 | 合肥工业大学 | Electromagnetic synergistic enhanced porous light polyurethane electromagnetic shielding composite material and preparation method thereof |
| CN110511556A (en) * | 2019-08-30 | 2019-11-29 | 合肥工业大学 | A kind of porous light polyurethane electromagnetic shielding composite material and preparation method thereof of electromagnetism collaboration enhancing |
| CN110791079A (en) * | 2019-10-18 | 2020-02-14 | 蔡娟 | Co3O4-composite electromagnetic shielding material of carbon nano tube modified polyurethane |
| CN112094426B (en) * | 2020-09-16 | 2021-11-16 | 江南大学 | Impedance gradual change type graphene-based polyimide composite foam wave-absorbing material |
| CN112094426A (en) * | 2020-09-16 | 2020-12-18 | 江南大学 | Impedance gradual change type graphene-based polyimide composite foam wave-absorbing material |
| CN112969356A (en) * | 2021-01-19 | 2021-06-15 | 西安理工大学 | Preparation method of polyurethane/graphene nanosheet/sponge composite material |
| CN114437396A (en) * | 2021-12-31 | 2022-05-06 | 安徽工业大学 | Electromagnetic shielding composite foam with sandwich structure and preparation method thereof |
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Application publication date: 20170419 |