CN105555112A - Electromagnetic shielding composite material - Google Patents
Electromagnetic shielding composite material Download PDFInfo
- Publication number
- CN105555112A CN105555112A CN201610044032.0A CN201610044032A CN105555112A CN 105555112 A CN105555112 A CN 105555112A CN 201610044032 A CN201610044032 A CN 201610044032A CN 105555112 A CN105555112 A CN 105555112A
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- electromagnetic
- electromagnetic wave
- reflection
- composite material
- shielding composite
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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 an electromagnetic shielding composite material. Electromagnetic wave absorption layers and electromagnetic wave reflection layers are alternately overlapped to form electromagnetic shielding function bodies; the electromagnetic wave absorption layers are formed by compositing matrix resin, fiber carriers and electromagnetic absorption function bodies; the electromagnetic wave absorption layers are formed by compositing matrix resin and electromagnetic gradient reflection function bodies; in the overlapped electromagnetic wave reflection layers, the mass percentage compositions of short cut carbon fibers increase in gradient along the incident directions of the electromagnetic waves. According to the electromagnetic shielding composite material of the invention, the incident electromagnetic waves generate multi-reflection; the propagation paths of the electromagnetic waves in the material are increased; increase of the multi-reflection loss and absorption loss enables the shielding efficiency of the material to be increased; in adoption of the reflection layers of gradient structure, the electromagnetic waves will not escape away from the shielding material rapidly for reflection; more electromagnetic waves can enter the next shielding unit; therefore, the shielding efficiency of the material is further improved.
Description
Technical field
The invention belongs to field of compound material, be specifically related to a kind of electromagnetic shielding composite material.
Background technology
The materials such as traditional electromagnetic shielding material many employings metal and latten, thin slice, strip, thin net.Above-mentioned traditional shielding material will expend more metals resources, power consumption of polymer processing is large, cost is high.Along with the corrosion of metal, screening effectiveness also can reduce.The designability of screening effectiveness is also poor, and shielding mechanism mainly reflects, and is unfavorable for reducing electromagnetic pollution, poor in the place applicability of the higher screening effectiveness of many needs.
The Study and Development of electromagnetic shielding composite material more and more causes the concern of people, and Novel shielding material emerges in an endless stream.Advanced fiber reinforced polymer matrix composite, adopts conductive fiber, adds conductive filler, at technical methods such as non-conductive fiber plating metal on surface films, can obtain electromagnetic shielding composite material.But the screening function screening effectiveness of unit is lower, designability is not enough.Further developing direction is the electromagnetic shielding composite material of polynary screening function composition.
Summary of the invention
The object of the invention is the electromagnetic shielding composite material providing a kind of new structure, and this shielding material has higher screening effectiveness and good designability.
For achieving the above object, adopt technical scheme as follows:
A kind of electromagnetic shielding composite material, from outward appearance to inner essence adopts the alternately superposition of electromagnetic wave absorbing layer and reflection of electromagnetic wave layer; One deck reflection of electromagnetic wave layer of one deck electromagnetic wave absorbing layer and below forms a screen unit;
Described electromagnetic wave absorbing layer adopts matrix resin, fiber carrier and electromagnetic absorption functive to be composited;
Described reflection of electromagnetic wave layer adopts matrix resin, ELECTROMAGNETIC REFLECTION functive is composited; Described ELECTROMAGNETIC REFLECTION functive is the combination mat of chopped carbon fiber and short glass fiber mixing; Wherein, in the reflection of electromagnetic wave layer of superposition, chopped carbon fiber mass percentage raises along electromagnetic wave incident direction gradient.
By such scheme, described screen unit is 3-5.
By such scheme, described electromagnetic absorption functive is carbonyl iron dust, conductive black, graphite or carborundum.
By such scheme, described matrix resin is unsaturated polyester resin, vinyl ester resin, epoxy resin, phenolic resins, bimaleimide resin or polyimide resin.
By such scheme, described fiber carrier is glass mat; Fibre length is 6mm, and filament diameter is 6 ~ 7 μm, and surface density is 30 ± 3g/m
2.
By such scheme, in the reflection of electromagnetic wave layer of the described electromagnetic shielding composite material bottom, reflection function body is the chopped carbon fiber of 100wt%.
By such scheme, described chopped carbon fiber length is 5 ~ 8mm, and filament diameter is 6 ~ 7 μm; Described short glass fiber length is 5 ~ 8mm, and filament diameter is 9 ~ 13 μm.
By such scheme, described electromagnetic wave gradient reflector is distributed as along the mass percent gradient of electromagnetic wave incident direction chopped carbon fiber in combination mat: 5%, 10%, 15% and 100%.
By such scheme, described electromagnetic wave gradient reflector is distributed as along the mass percent gradient of electromagnetic wave incident direction chopped carbon fiber in combination mat: 3%, 8%, 13% and 100%.
By such scheme, described electromagnetic wave gradient reflector is distributed as along the mass percent gradient of electromagnetic wave incident direction chopped carbon fiber in combination mat: 4%, 9%, 14% and 100%.
Relative to prior art, beneficial effect of the present invention is as follows:
Present invention incorporates the advantage of sandwich and Gradient Materials, possess the performance more excellent relative to this bi-material.Multilayer is absorbed and gradient reflected electromagnetic shielding composite, due to the impedance mismatch between absorbing material layer and reflector, incident electromagnetic wave can produce multipath reflection, add electromagnetic wave propagation path in the material, the increase of multipath reflection loss and absorption loss makes the screening effectiveness of material become large; And the reflector of gradient-structure, reduce the resistance difference between reflector and absorbed layer, make electromagnetic wave too fastly because of reflection can not escape from shielding material, more can enter next screen unit, further increase the screening effectiveness of material.There is good shielding properties.
By changing carbon black content, the thickness of electromagnetic wave absorbing layer, carbon fiber content, the thickness in electromagnetic wave gradient reflector, and the superposition number of screen unit can adjust the shielding properties of shielding material further, it is made to meet the demand of special frequency channel to shielding properties.There is good designability.
Accompanying drawing explanation
The schematic diagram of Fig. 1: four unit electromagnetic shielding composite materials;
Fig. 2: electromagnetic shielding composite material of the present invention is to shielding electromagnetic waves functional schematic.
Embodiment
Following examples explain technical scheme of the present invention further, but not as limiting the scope of the invention.
Electromagnetic shielding composite material, from outward appearance to inner essence adopts the alternately superposition of electromagnetic wave absorbing layer and reflection of electromagnetic wave layer; One deck reflection of electromagnetic wave layer of one deck electromagnetic wave absorbing layer and below forms a screen unit; With reference to shown in accompanying drawing 1.
Electromagnetic wave absorbing layer (1a, 2a, 3a, 4a) adopts matrix resin, fiber carrier and electromagnetic absorption functive to be composited; Reflection of electromagnetic wave layer (1r, 2r, 3r, 4r) adopts matrix resin, ELECTROMAGNETIC REFLECTION functive is composited; Described ELECTROMAGNETIC REFLECTION functive is the combination mat of chopped carbon fiber and short glass fiber mixing; Wherein, in the reflection of electromagnetic wave layer of superposition, chopped carbon fiber mass percentage raises 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 is 5 ~ 8mm, and filament diameter is 9 ~ 13 μm.
Preferred fiber carrier is glass mat, and fibre length is 6mm, and filament diameter is 6 ~ 7 μm, and surface density is 30 ± 3g/m
2.
Electromagnetic absorption functive is carbonyl iron dust, conductive black, graphite or carborundum.Preferred electromagnetic absorption functive is conductive carbon black, and particle diameter is 10 ~ 100nm.
Matrix resin mainly plays a part bonding, shaping.Can be unsaturated polyester resin, vinyl ester resin, epoxy resin, phenolic resins, bimaleimide resin or polyimide resin.Preferred resin is epoxy resin, and epoxide number is 0.51.Epoxy resin has the advantages such as density is little, strong adhesion, good radiation resistance.
In the scheme optimized, in each screen unit, top 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, not containing short glass fiber.Further prioritization scheme, the combination mat chopped carbon fiber mass percentage in electromagnetic wave gradient reflector is followed successively by 5%, 10%, 15% and 100%.
The preparation process of electromagnetic shielding composite material of the present invention:
By the 100:24:6 mixing in mass ratio of epoxy resin, curing agent, carbon black, adopt vacuum assisted resin infusion to import in glass mat after stirring, in room temperature (25 DEG C) solidification after infiltration, the demoulding obtains individual layer electromagnetic wave absorbing layer;
By chopped carbon fiber and short glass fiber difference 5:95,10:90,15:85 and 0:100 in mass ratio; Mix in beater, the combination mat of obtained different carbon fiber content, carbon fiber content is respectively 5%, 10%, 15% and 100%.By the 100:24 mixing in mass ratio of epoxy resin, curing agent, vacuum assisted resin infusion is adopted to import in the mixed fibre felt of 4 kinds of carbon fiber contents respectively after stirring, in room temperature (25 DEG C) solidification after infiltration, the demoulding obtains 4 kinds of individual layer reflection of electromagnetic wave layers;
By 4 layers of electromagnetic wave absorbing layer and 4 layers of reflection of electromagnetic wave layer alternately superposition, along electromagnetic wave incident direction, combination mat, carbon fiber content is respectively 5%, 10%, 15% and 100%, reflection of electromagnetic wave layer epoxy resin bonds them, molded curing under room temperature (25 DEG C), obtains electromagnetic shielding composite material.
The each layer electro-magnetic wave absorption layer thickness obtained is 0.18mm, and each layer reflection of electromagnetic wave layer thickness is 0.26mm, and shielding material thickness is 1.82mm, and 3.22 to 4.6GHz time, the screening effectiveness of this material can reach more than 60dB.Thus, this shielding material has higher screening effectiveness.
With reference to shown in accompanying drawing 2, multilayer of the present invention absorbs and gradient reflected electromagnetic shielding composite, due to the impedance mismatch between absorbing material layer and reflector, incident electromagnetic wave can produce multipath reflection, add electromagnetic wave propagation path in the material, the increase of multipath reflection loss and absorption loss makes the screening effectiveness of material become large; And the reflector of gradient-structure, reduce the resistance difference between reflector and absorbed layer, make electromagnetic wave too fastly because of reflection can not escape from shielding material, more can enter next screen unit, further increase the screening effectiveness of material.Thus, the shielding material of this structure has good shielding properties.
By changing carbon black content, the thickness of electromagnetic wave absorbing layer, carbon fiber content, the thickness in electromagnetic wave gradient reflector, and the superposition number of screen unit can adjust the shielding properties of shielding material further, it is made to meet the demand of special frequency channel to shielding properties.Thus, this shielding material has good designability.
Claims (10)
1. an electromagnetic shielding composite material, is characterized in that from outward appearance to inner essence adopting the alternately superposition of electromagnetic wave absorbing layer and reflection of electromagnetic wave layer; One deck reflection of electromagnetic wave layer of one deck electromagnetic wave absorbing layer and below forms a screen unit;
Described electromagnetic wave absorbing layer adopts matrix resin, fiber carrier and electromagnetic absorption functive to be composited;
Described reflection of electromagnetic wave layer adopts matrix resin, ELECTROMAGNETIC REFLECTION functive is composited; Described ELECTROMAGNETIC REFLECTION functive is the combination mat of chopped carbon fiber and short glass fiber mixing; Wherein, in the reflection of electromagnetic wave layer of superposition, chopped carbon fiber mass percentage raises along electromagnetic wave incident direction gradient.
2. electromagnetic shielding composite material as claimed in claim 1, is characterized in that described screen unit is 3-5.
3. electromagnetic shielding composite material as claimed in claim 1, is characterized in that described electromagnetic absorption functive is carbonyl iron dust, conductive black, graphite or carborundum.
4. electromagnetic shielding composite material as claimed in claim 1, is characterized in that described matrix resin is unsaturated polyester resin, vinyl ester resin, epoxy resin, phenolic resins, bimaleimide resin or polyimide resin.
5. electromagnetic shielding composite material as claimed in claim 1, is characterized in that described fiber carrier is glass mat; Fibre length is 6mm, and filament diameter is 6 ~ 7 μm, and surface density is 30 ± 3g/m
2.
6. electromagnetic shielding composite material as claimed in claim 1, is characterized in that in the reflection of electromagnetic wave layer of the described electromagnetic shielding composite material bottom, reflection function body is the chopped carbon fiber of 100wt%.
7. electromagnetic shielding composite material as claimed in claim 1, it is characterized in that described chopped carbon fiber length is 5 ~ 8mm, filament diameter is 6 ~ 7 μm; Described short glass fiber length is 5 ~ 8mm, and filament diameter is 9 ~ 13 μm.
8. electromagnetic shielding composite material as claimed in claim 1, is characterized in that described reflection of electromagnetic wave layer is distributed as along the mass percent gradient of electromagnetic wave incident direction chopped carbon fiber in combination mat: 5%, 10%, 15% and 100%.
9. electromagnetic shielding composite material as claimed in claim 1, is characterized in that described reflection of electromagnetic wave layer is distributed as along the mass percent gradient of electromagnetic wave incident direction chopped carbon fiber in combination mat: 3%, 8%, 13% and 100%.
10. electromagnetic shielding composite material as claimed in claim 1, is characterized in that described reflection of electromagnetic wave layer is distributed as along the mass percent gradient of electromagnetic wave incident direction chopped carbon fiber in combination mat: 4%, 9%, 14% and 100%.
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| CN105555112B (en) | 2018-09-18 |
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