CN105555112B - A kind of electromagnetic shielding composite material - Google Patents
A kind of electromagnetic shielding composite material Download PDFInfo
- Publication number
- CN105555112B CN105555112B CN201610044032.0A CN201610044032A CN105555112B CN 105555112 B CN105555112 B CN 105555112B CN 201610044032 A CN201610044032 A CN 201610044032A CN 105555112 B CN105555112 B CN 105555112B
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- electromagnetic wave
- reflection
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- electromagnetic
- carbon fiber
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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
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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
- H05K9/009—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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Textile Engineering (AREA)
- Laminated Bodies (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention discloses a kind of electromagnetic shielding composite materials.Using electromagnetic wave absorbing layer and reflection of electromagnetic wave layer, alternately superposition is used as electro-magnetic screen function body；Electromagnetic wave absorbing layer is combined using matrix resin, fiber carrier and electromagnetic absorption functive；Reflection of electromagnetic wave layer is formed using matrix resin, electromagnetism gradient reflection function bluk recombination；Chopped carbon fiber mass percentage is increased along electromagnetic wave incident direction gradient in the reflection of electromagnetic wave layer of superposition.Electromagnetic shielding composite material of the present invention makes incident electromagnetic wave generate multipath reflection, increases the propagation path of electromagnetic wave in the material, multipath reflection loss and the increase of absorption loss are so that the shield effectiveness of material becomes larger；And the reflecting layer of gradient-structure makes what electromagnetic wave will not be too fast because of reflection to escape from shielding material, can more enter next screen unit, further improve the shield effectiveness of material.
Description
Technical field
The invention belongs to field of compound material, and in particular to a kind of electromagnetic shielding composite material.
Background technology
Traditional electromagnetic shielding material mostly uses the materials such as metal and its latten, thin slice, strip, thin net.Above-mentioned biography
It is big, of high cost that system shielding material will expend more metals resources, power consumption of polymer processing.With the corrosion of metal, shield effectiveness also can
It reduces.The designability of shield effectiveness is also poor, and shielding mechanism mainly reflects, and is unfavorable for reducing electromagnetic pollution, in many need
Want the place applicability of higher shield effectiveness poor.
The development and exploitation of electromagnetic shielding composite material have attracted more and more attention from people, and novel shielding material layer goes out not
Thoroughly.Advanced fiber reinforced polymer matrix composite, using conductive fiber, addition conductive filler, on non-conductive fiber surface
Electromagnetic shielding composite material can be made in the technical methods such as metal-coated membrane.However the screening function shield effectiveness of unit is relatively low,
Designability is insufficient.Further developing direction is the electromagnetic shielding composite material of polynary screening function composition.
Invention content
Present invention aims at a kind of new structural electromagnetic shielding composite material is provided, which has compared with Gao Ping
Cover efficiency and good designability.
In order to achieve the above objectives, as follows using technical solution：
A kind of electromagnetic shielding composite material from outward appearance to inner essence uses electromagnetic wave absorbing layer and reflection of electromagnetic wave layer to be alternately superimposed；
One layer of electromagnetic wave absorbing layer and one layer of reflection of electromagnetic wave layer of lower section constitute a screen unit；
The electromagnetic wave absorbing layer is combined using matrix resin, fiber carrier and electromagnetic absorption functive；
The reflection of electromagnetic wave layer is combined using matrix resin, ELECTROMAGNETIC REFLECTION functive；The ELECTROMAGNETIC REFLECTION function
Body is the combination mat that chopped carbon fiber and short glass fiber mix；Wherein, chopped carbon fiber in the reflection of electromagnetic wave layer of superposition
Mass percentage is increased along electromagnetic wave incident direction gradient.
By said program, the screen unit is 3-5.
By said program, the electromagnetic absorption functive is carbonyl iron dust, conductive black, graphite or silicon carbide.
By said program, described matrix resin is unsaturated polyester resin, vinyl ester resin, epoxy resin, phenolic aldehyde tree
Fat, bimaleimide resin or polyimide resin.
By said program, the fiber carrier is glass mat；Fibre length is 6mm, and filament diameter is 6~7 μm, face
Density is 30 ± 3g/m2。
By said program, reflection function body is in the reflection of electromagnetic wave layer of the electromagnetic shielding composite material bottom
The chopped carbon fiber of 100wt%.
By said program, the chopped carbon fiber length is 5~8mm, and filament diameter is 6~7 μm；The staple glass is fine
Dimension length is 5~8mm, and filament diameter is 9~13 μm.
By said program, electromagnetic wave gradient reflecting layer is along electromagnetic wave incident direction chopped carbon fiber in combination mat
Mass percent gradient is distributed as：5%, 10%, 15% and 100%.
By said program, electromagnetic wave gradient reflecting layer is along electromagnetic wave incident direction chopped carbon fiber in combination mat
Mass percent gradient is distributed as：3%, 8%, 13% and 100%.
By said program, electromagnetic wave gradient reflecting layer is along electromagnetic wave incident direction chopped carbon fiber in combination mat
Mass percent gradient is distributed as：4%, 9%, 14% and 100%.
Compared with the existing technology, the present invention has the beneficial effect that：
The advantages of present invention incorporates sandwich and Gradient Materials has more excellent relative to both materials
Different performance.Multilayer is absorbed and gradient reflects electromagnetic shielding composite material, due between absorbing material layer and reflecting layer
Impedance mismatch, incident electromagnetic wave will produce multipath reflection, increase the propagation path of electromagnetic wave in the material, multipath reflection
Loss and the increase of absorption loss are so that the shield effectiveness of material becomes larger；And the reflecting layer of gradient-structure, reduce reflecting layer with
Absorb the resistance difference of interlayer so that electromagnetic wave will not be too fast because of reflection escapes from shielding material, under can more entering
One screen unit further improves the shield effectiveness of material.With preferable shielding properties.
By changing carbon black content, the thickness of electromagnetic wave absorbing layer, the carbon fiber content in electromagnetic wave gradient reflecting layer, thickness
The superposition number of degree and screen unit can further adjust the shielding properties of shielding material, it is made to meet special frequency channel pair
The demand of shielding properties.With good designability.
Description of the drawings
Fig. 1：The schematic diagram of four unit electromagnetic shielding composite materials；
Fig. 2：Electromagnetic shielding composite material of the present invention is to shielding electromagnetic waves functional schematic.
Specific implementation mode
Following embodiment further illustrates technical scheme of the present invention, but not as limiting the scope of the invention.
Electromagnetic shielding composite material from outward appearance to inner essence uses electromagnetic wave absorbing layer and reflection of electromagnetic wave layer to be alternately superimposed；One layer
Electromagnetic wave absorbing layer and one layer of reflection of electromagnetic wave layer of lower section constitute a screen unit；With reference to shown in attached drawing 1.
Electromagnetic wave absorbing layer (1a, 2a, 3a, 4a) using matrix resin, fiber carrier and the bluk recombination of electromagnetic absorption function and
At；Reflection of electromagnetic wave layer (1r, 2r, 3r, 4r) is combined using matrix resin, ELECTROMAGNETIC REFLECTION functive；The ELECTROMAGNETIC REFLECTION
Functive is the combination mat that chopped carbon fiber and short glass fiber mix；Wherein, be chopped carbon in the reflection of electromagnetic wave layer of superposition
Fiber quality percentage composition is increased along electromagnetic wave incident direction gradient.
Wherein, chopped carbon fiber length is 5~8mm, and filament diameter is 6~7 μm；Short glass fiber length be 5~
8mm, filament diameter are 9~13 μm.
Preferred fiber carrier is glass mat, and fibre length 6mm, filament diameter is 6~7 μm, surface density 30
±3g/m2。
Electromagnetic absorption functive is carbonyl iron dust, conductive black, graphite or silicon carbide.Preferably electromagnetic absorption functive is
Conductive carbon black, grain size are 10~100nm.
Matrix resin mainly plays bonding, molding.Can be unsaturated polyester resin, vinyl ester resin, epoxy
Resin, phenolic resin, bimaleimide resin or polyimide resin.Preferred resin is epoxy resin, and epoxide number is
0.51.Epoxy resin has many advantages, such as small density, strong adhesive force, good radiation resistance.
In the scheme of optimization, in each screen unit, surface layer is electromagnetic wave absorbing layer, and bottom is reflection of electromagnetic wave layer；
And combination mat is the chopped carbon fiber of 100wt% in bottom reflection of electromagnetic wave layer, does not contain short glass fiber.It is further excellent
Change scheme, the combination mat chopped carbon fiber mass percentage in electromagnetic wave gradient reflecting layer are followed successively by 5%, 10%, 15% and
100%.
The preparation process of electromagnetic shielding composite material of the present invention：
By epoxy resin, curing agent, carbon black in mass ratio 100:24:6 mixing, use vacuum assisted resin infusion after stirring evenly
It imports in glass mat, single layer electromagnetic wave absorbing layer is obtained in (25 DEG C) solidifications of room temperature, demoulding after infiltration；
By chopped carbon fiber and short glass fiber difference in mass ratio 5:95、10:90、15：85 and 0:100；It is being beaten
It is uniformly mixed in machine, the combination mat of different carbon fiber contents is made, carbon fiber content is respectively 5%, 10%, 15% and 100%.
By epoxy resin, curing agent in mass ratio 100:24 mixing, are directed respectively into using vacuum assisted resin infusion to 4 kinds of carbon after stirring evenly
In the mixed fibre felt of fiber content, 4 kinds of single layer reflection of electromagnetic wave layers are obtained in (25 DEG C) solidifications of room temperature, demoulding after infiltration；
4 layers of electromagnetic wave absorbing layer and 4 layers of reflection of electromagnetic wave layer are alternately superimposed, along electromagnetic wave incident direction, combination mat,
Carbon fiber content is respectively 5%, 10%, 15% and 100%, and reflection of electromagnetic wave layer is bonded them with epoxy resin,
Molded curing under room temperature (25 DEG C), obtains electromagnetic shielding composite material.
Obtained each layer electro-magnetic wave absorption layer thickness is 0.18mm, and each layer reflection of electromagnetic wave layer thickness is 0.26mm, shielding
Material thickness is 1.82mm, and at 3.22 to 4.6GHz, the shield effectiveness of the material is up to 60dB or more.Thus, the shielding material
Material has higher shield effectiveness.
With reference to shown in attached drawing 2, multilayer of the present invention absorbs and gradient reflects electromagnetic shielding composite material, due to absorbing material layer
Impedance mismatch between reflecting layer, incident electromagnetic wave will produce multipath reflection, increase the biography of electromagnetic wave in the material
Path is broadcast, multipath reflection loss and the increase of absorption loss are so that the shield effectiveness of material becomes larger；And the reflecting layer of gradient-structure,
It reduces reflecting layer and absorbs the resistance difference of interlayer so that electromagnetic wave will not be too fast because of reflection escapes from shielding material, can
More to enter next screen unit, the shield effectiveness of material is further improved.Thus, the shielding material of the structure has
Preferable shielding properties.
By changing carbon black content, the thickness of electromagnetic wave absorbing layer, the carbon fiber content in electromagnetic wave gradient reflecting layer, thickness
The superposition number of degree and screen unit can further adjust the shielding properties of shielding material, it is made to meet special frequency channel pair
The demand of shielding properties.Thus, which has good designability.
Claims (5)
1. a kind of electromagnetic shielding composite material, it is characterised in that electromagnetic wave absorbing layer and reflection of electromagnetic wave layer is from outward appearance to inner essence used to hand over
For superposition；One layer of electromagnetic wave absorbing layer and one layer of reflection of electromagnetic wave layer of lower section constitute a screen unit；
The electromagnetic wave absorbing layer is combined using matrix resin, fiber carrier and electromagnetic absorption functive；The electromagnetism is inhaled
Receipts functive is carbonyl iron dust, conductive black, graphite or silicon carbide；The fiber carrier is glass mat；Fibre length is
6mm, filament diameter are 6~7 μm, and surface density is 30 ± 3g/m2；
The reflection of electromagnetic wave layer is combined using matrix resin, ELECTROMAGNETIC REFLECTION functive；The ELECTROMAGNETIC REFLECTION functive is
The combination mat of chopped carbon fiber and short glass fiber mixing；The chopped carbon fiber length be 5~8mm, filament diameter be 6~
7μm；The short glass fiber length is 5~8mm, and filament diameter is 9~13 μm；Wherein, in the reflection of electromagnetic wave layer of superposition
Chopped carbon fiber mass percentage is increased along electromagnetic wave incident direction gradient；Reflection function in the reflection of electromagnetic wave layer of the bottom
Body is the chopped carbon fiber of 100wt%；
Described matrix resin is unsaturated polyester resin, vinyl ester resin, epoxy resin, phenolic resin, bismaleimide
Resin or polyimide resin.
2. electromagnetic shielding composite material as described in claim 1, it is characterised in that the screen unit is 3-5.
3. electromagnetic shielding composite material as described in claim 1, it is characterised in that the reflection of electromagnetic wave layer enters along electromagnetic wave
Mass percent gradient of the direction chopped carbon fiber in combination mat is penetrated to be distributed as：5%, 10%, 15% and 100%.
4. electromagnetic shielding composite material as described in claim 1, it is characterised in that the reflection of electromagnetic wave layer enters along electromagnetic wave
Mass percent gradient of the direction chopped carbon fiber in combination mat is penetrated to be distributed as：3%, 8%, 13% and 100%.
5. electromagnetic shielding composite material as described in claim 1, it is characterised in that the reflection of electromagnetic wave layer enters along electromagnetic wave
Mass percent gradient of the direction chopped carbon fiber in combination mat is penetrated to be distributed as：4%, 9%, 14% and 100%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610044032.0A CN105555112B (en) | 2016-01-22 | 2016-01-22 | A kind of electromagnetic shielding composite material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610044032.0A CN105555112B (en) | 2016-01-22 | 2016-01-22 | A kind of electromagnetic shielding composite material |
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| CN105555112A CN105555112A (en) | 2016-05-04 |
| CN105555112B true CN105555112B (en) | 2018-09-18 |
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| CN106490711A (en) * | 2016-11-17 | 2017-03-15 | 无锡市长安曙光手套厂 | A kind of detachable plate exposure suit |
| CN106473260A (en) * | 2016-11-17 | 2017-03-08 | 无锡市长安曙光手套厂 | A kind of detachable plate exposure suit |
| CN106723456A (en) * | 2016-11-17 | 2017-05-31 | 无锡市长安曙光手套厂 | A kind of exposure suit |
| CN106473261A (en) * | 2016-11-17 | 2017-03-08 | 无锡市长安曙光手套厂 | A kind of detachable plate exposure suit |
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| CN112848586B (en) * | 2020-12-30 | 2022-06-07 | 中国科学院长春应用化学研究所 | Multilayer electromagnetic shielding composite material based on isolation structure and preparation method and application thereof |
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