CN109168314A - A kind of electromagnetic shielding unit - Google Patents
A kind of electromagnetic shielding unit Download PDFInfo
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- CN109168314A CN109168314A CN201811231969.4A CN201811231969A CN109168314A CN 109168314 A CN109168314 A CN 109168314A CN 201811231969 A CN201811231969 A CN 201811231969A CN 109168314 A CN109168314 A CN 109168314A
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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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- 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
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/06—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of natural rubber or synthetic rubber
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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
- B32B25/00—Layered products comprising a layer of natural or synthetic rubber
- B32B25/02—Layered products comprising a layer of natural or synthetic rubber with fibres or particles being present as additives in the layer
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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
- B32B25/00—Layered products comprising a layer of natural or synthetic rubber
- B32B25/20—Layered products comprising a layer of natural or synthetic rubber comprising silicone rubber
-
- 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
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
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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
- B32B2250/00—Layers arrangement
- B32B2250/02—2 layers
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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
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/10—Inorganic fibres
- B32B2262/106—Carbon fibres, e.g. graphite fibres
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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
- 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
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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
- B32B2457/00—Electrical equipment
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
This application involves a kind of electromagnetic shielding units, the electromagnetic shielding unit is double-layer structure setting, outer layer is ducting layer, internal layer is to inhale wave layer, the ducting layer uses red copper latten, and the suction wave layer fills silver-plated carbon fiber using silicon rubber as matrix, carbon fiber is corynebacterium, and random distribution is wherein.
Description
Technical field
This application involves electromangnetic spectrum field more particularly to a kind of electromagnetic shielding units.
Background technique
With the development of electronic technology, various electronic equipments are just towards complication, multifunctional direction application.On the one hand due to
Electromagnetic wave application is more frequently covered with a wide range of, and electromagnetic interference becomes numerous electronic equipments difficulty unavoidably to be faced
Topic；On the other hand, electronic component is widely used and develops in various equipment so that its become in face of electromagnetic wave it is fragile not
Bear.It is electromagnetically shielded the ever more important that seems.
In traditional electromangnetic spectrum, electromagnetic shielding material is broadly divided into application type and structural type.Application type material
Referred to as microwave absorbing coating, is mainly characterized by adaptable to target shape, and preparation is simple, mainly has ferrite wave-absorbing material, receives
Rice absorbing material, conductive polymeric radar absorbing material, high temperature ceramic material etc.；Structural type electromagnetic shielding material usually has multilayer
The fillers such as wave absorbing agent are distributed in basis material and form composite material by structure, and typical feature is that designability is strong, electromagnetic shielding
Wider range etc..
Electromagnetic shielding material is the direction that countries in the world today is considered as focus development, however currently, electromagnetic screen coating at
This is low, simple and practical, but effectiveness is bad, and structural type electromagnetic shielding material generally uses metal packing etc., density
It is larger, and electromagnetic shielding performance needs to be further increased.
Summary of the invention
The present invention is intended to provide a kind of electromagnetic shielding unit, set forth above to solve the problems, such as.
A kind of electromagnetic shielding unit is provided in the embodiment of the present invention, the electromagnetic shielding unit sets for double-layer structure
It sets, outer layer is ducting layer, and internal layer is to inhale wave layer, and the ducting layer uses red copper latten, and the suction wave layer is with silicon rubber
Matrix, and silver-plated carbon fiber is filled, carbon fiber is corynebacterium, and random distribution is wherein.
The technical solution that the embodiment of the present invention provides can include the following benefits:
The electromagnetic shielding unit of the application be double-layer structure, be divided into ducting layer and inhale wave layer, by electromagnetic wave transmission, draw
It leads and absorbs layering progress, ducting layer uses red copper latten in structure design, with good conductive and magnetic conductivity
Can, it can uniformly be transmitted to by feedback and conductive process after Electromagnetic Wave Propagation to its surface and inhale wave layer, maximum
Change and improves wave absorbing efficiency；On the other hand, ducting layer red copper latten has compared with strong hardness, can be used as protection shell, internally
It inhales wave layer and protection is provided in portion.
The additional aspect of the application and advantage will be set forth in part in the description, and will partially become from the following description
It obtains obviously, or recognized by the practice of the application.It should be understood that above general description and following detailed description are only
Be it is exemplary and explanatory, the application can not be limited.
Specific embodiment
Example embodiments are described in detail here, embodiment described in following exemplary embodiment
Do not represent all embodiments consistented with the present invention.On the contrary, they be only with as being described in detail in the appended claims
, the examples of the device and method that some aspects of the invention are consistent.
Embodiments herein is related to a kind of electromagnetic shielding unit, which is double-layer structure setting, outer layer
For ducting layer, internal layer is to inhale wave layer, and the ducting layer uses red copper latten, the suction wave layer using silicon rubber as matrix, and
And the silver-plated carbon fiber of filling, carbon fiber is corynebacterium, and random distribution is wherein.
In configuration aspects, the electromagnetic shielding unit of the application is double-layer structure, is divided into ducting layer and inhales wave layer, will be to electromagnetism
The transmission of wave, guidance are carried out with layering is absorbed, and ducting layer uses red copper latten in structure design, are led with good
Electricity and magnetic property can uniformly be transmitted to by feeding back and conductive process after Electromagnetic Wave Propagation to its surface
Wave layer is inhaled, maximizes and improves wave absorbing efficiency；On the other hand, ducting layer red copper latten has compared with strong hardness, can be used as guarantor
Shell is protected, wave layer is inhaled to inside, protection is provided.
In addition, importantly, inhaling wave layer using silicon rubber as matrix, and fill in the electromagnetic shielding unit of the application
Silver-plated carbon fiber, carbon fiber are corynebacterium, and random distribution wherein, forms irregular conductive magneto-conductive network, substantially increases electricity
Magnetic Shielding Effectiveness.
Design of the electromagnetic shielding unit of the application in terms of structure and material plays meaning in terms of effectiveness
Unimaginable effect, and prepare simple, strong operability.
A kind of preferred embodiment is, in the red copper latten, copper content 76%, iron-content 13% contains zinc
Amount is 11%；By limiting above-mentioned copper, iron and Zn content, electromagnetic shielding unit is enabled to play more excellent electromagnetic shielding effect
Fruit.
Preferably, the ducting layer is with a thickness of 1mm.
A kind of preferred embodiment is that the suction wave layer is with a thickness of 3mm；
In inhaling wave layer, the silver-plated carbon fiber density is 80~120/cm2, it is respectively 3 that there are two types of length for tool
~5mm and 7~9mm；
It is arranged by two kinds of length, is easy to the formation of conductive net, works well for electromagnetic wave absorption, is had and expect not
The wave-absorbing effect arrived；
Preferably, also contain isopropanol as antifreezing agent in the suction wave layer；It can effectively enhance silicone rubber substrate and exist
Flexibility under low temperature prevents from being broken；
Preferably, the mass ratio of the 3~5mm and the silver-plated carbon fiber of 7~9mm length is 4:1；
Preferably, which is preferably dimensioned to be density 1.75g/cm3, 5 μm of diameter, wherein silver coating with a thickness of
200nm。
Disclosed herein as well is the preparation process of above-mentioned electromagnetic shielding unit:
S1 prepares ducting layer
S2 handles carbon fiber thermal, removes surface impurity；Then electroplating solution is configured, using silver plate as anode, at heat
Carbon fiber after reason is immersed in electroplating solution as cathode, anode and cathode, obtains silver-plated carbon fiber by plating；
Silver-plated carbon fiber is put into the silane coupling agent through diluting and impregnates 1min by S3, by silver-plated carbon fiber after drying
It is cut into 3~5mm and 7~9mm length；Then using open double rod refining glue machinings, use silicon rubber for matrix, silver-plated carbon
Fiber is filler, and isopropanol is antifreezing agent, and wave layer is inhaled in preparation；
S4 will inhale on the inside of wave layer insertion ducting layer, obtain the electromagnetic shielding unit.
Wherein, in S1, the preparation ducting layer specifically: ducting layer uses red copper latten material, and copper contains in material
Amount is 76%, and iron-content 13%, zinc content 11%, ducting layer is with a thickness of 1mm；
Wherein, in S2, the density of the carbon fiber is 1.75g/cm3, diameter is 5 μm；
It is described to handle carbon fiber thermal specifically: carbon fiber is placed in batch-type furnace and handles 30 min at 400 DEG C,
The electroplating solution process for preparation are as follows: take silver sulfate, ammonium chloride, boric acid, dodecyl sodium sulfate preparation plating molten
Liquid, wherein content is followed successively by 120g/L, 16g/L, 15g/L, 2g/L, then uses ammonia water titration electroplating solution, makes its pH value
4.5；
It is described that silver-plated carbon fiber is obtained by plating specifically: in electroplating process, using mechanical stirring, and temperature is kept
At 30 DEG C, electroplating current density 3.0A/cm2, silver coating is with a thickness of 200nm；
Wherein, in S3, the silane coupling agent preparation process through diluting are as follows: vinyltriethoxysilane is dilute
It releases, solvent is the solution that water and ethyl alcohol are prepared, and each section mass ratio is silane -20%, ethyl alcohol -72%, water -8%；
Further explanation is made to the present invention combined with specific embodiments below:
Embodiment 1
A kind of electromagnetic shielding unit, the electromagnetic shielding unit are double-layer structure setting, and outer layer is ducting layer, and internal layer is to inhale wave
Layer, the ducting layer use red copper latten, and the suction wave layer fills silver-plated carbon fiber, carbon using silicon rubber as matrix
Fiber is corynebacterium, and random distribution is wherein.
The preparation process of the electromagnetic shielding unit are as follows:
S1, ducting layer use red copper latten material, and copper content is 76% in material, iron-content 13%, zinc content
It is 11%, ducting layer is with a thickness of 1mm；
S2, firstly, selecting carbon fiber, density 1.75g/cm, diameter is 5 μm, and carbon fiber is placed on 400 in batch-type furnace
30min is handled at DEG C, removes surface colloidal impurity；Then silver sulfate, ammonium chloride, boric acid, dodecyl sodium sulfate is taken to prepare electricity
Plating liquor, wherein content is followed successively by 120g/L, 16g/L, 15g/L, 2g/L, then uses ammonia water titration electroplating solution, makes its pH value
It is 4.5；Electroplating solution is placed in electroplanting device, using silver plate as anode in electroplanting device, carbon fiber is as cathode, anode
It is immersed in electroplating solution with cathode, in electroplating process, using mechanical stirring, and temperature is maintained at 30 DEG C, electroplating current
Density is 3.0A/cm2, silver coating obtains silver-plated carbon fiber with a thickness of 200nm；
S3, firstly, vinyltriethoxysilane is diluted, solvent is the solution that water and ethyl alcohol are prepared, each section ratio
For silane -20%, ethyl alcohol -72%, then silver-plated carbon fiber is put into the silane coupling agent through diluting and impregnates by water -8%
Silver-plated carbon fiber is cut into 3~5mm and 7~9mm length after drying by 1min；Then machined using open double rod refining glues,
Use silicon rubber for matrix, silver-plated carbon fiber is filler, and isopropanol is antifreezing agent, the silver-plated carbon fiber/silicon rubber of preparation flake
Material, wherein material thickness is 3mm, and silver-plated carbon fiber is uniformly distributed in material, and density is 80/cm2；Finally embed it in
On the inside of above-mentioned ducting layer, double-layer structure electromagnetic shielding unit is made.
Electromagnetic shielding aspect:
Electromagnetic shielding performance test is carried out to the electromagnetic shielding unit of the present embodiment, using E5071C type Network Analyzer method
Blue coaxial hair test, temperature is 30 DEG C, and humidity is 50% (RH).
Upper table is that silver-plated carbon fiber density is 80/cm in the present embodiment electromagnetic shielding unit2When, test obtains compound
Electromagnetic shielding material electromagnet shield effect curve within the scope of 200~1200MHz, material electromagnetic shielding curve is more gentle, electricity
Magnetic screen efficiency is higher, between 65~86db.
Mechanical properties:
Tensile property test is carried out to silver-plated carbon fiber/silicon rubber electromagnetic shielding material of the application, due to carbon fiber
It is added, the tensile strength of material is larger, reaches 2.6Mpa, has preferable mechanical performance, not easy to break.
Embodiment 2
A kind of electromagnetic shielding unit, the electromagnetic shielding unit are double-layer structure setting, and outer layer is ducting layer, and internal layer is to inhale wave
Layer, the ducting layer use red copper latten, and the suction wave layer fills silver-plated carbon fiber, carbon using silicon rubber as matrix
Fiber is corynebacterium, and random distribution is wherein.
The preparation process of the electromagnetic shielding unit are as follows:
S1, ducting layer use red copper latten material, and copper content is 76% in material, iron-content 13%, zinc content
It is 11%, ducting layer is with a thickness of 1mm；
S2, firstly, selecting carbon fiber, density 1.75g/cm, diameter is 5 μm, and carbon fiber is placed on 400 in batch-type furnace
30min is handled at DEG C, removes surface colloidal impurity；Then silver sulfate, ammonium chloride, boric acid, dodecyl sodium sulfate is taken to prepare electricity
Plating liquor, wherein content is followed successively by 120g/L, 16g/L, 15g/L, 2g/L, then uses ammonia water titration electroplating solution, makes its pH value
It is 4.5；Electroplating solution is placed in electroplanting device, using silver plate as anode in electroplanting device, carbon fiber is as cathode, anode
It is immersed in electroplating solution with cathode, in electroplating process, using mechanical stirring, and temperature is maintained at 30 DEG C, electroplating current
Density is 3.0A/cm2, silver coating obtains silver-plated carbon fiber with a thickness of 200nm；
S3, firstly, vinyltriethoxysilane is diluted, solvent is the solution that water and ethyl alcohol are prepared, each section ratio
For silane -20%, ethyl alcohol -72%, then silver-plated carbon fiber is put into the silane coupling agent through diluting and impregnates by water -8%
Silver-plated carbon fiber is cut into 3~5mm and 7~9mm length after drying by 1min；Then machined using open double rod refining glues,
Use silicon rubber for matrix, silver-plated carbon fiber is filler, and isopropanol is antifreezing agent, the silver-plated carbon fiber/silicon rubber of preparation flake
Material, wherein material thickness is 3mm, and silver-plated carbon fiber is uniformly distributed in material, and density is 90/cm2；Finally embed it in
On the inside of above-mentioned ducting layer, double-layer structure electromagnetic shielding unit is made.
Electromagnetic shielding aspect:
Electromagnetic shielding performance test is carried out to the electromagnetic shielding unit of the present embodiment, using E5071C type Network Analyzer method
Blue coaxial hair test, temperature is 30 DEG C, and humidity is 50% (RH).
Upper table is that silver-plated carbon fiber density is 90/cm in the present embodiment electromagnetic shielding unit2When, test obtains compound
Electromagnetic shielding material electromagnet shield effect curve within the scope of 200~1200MHz, material electromagnetic shielding curve is more gentle, electricity
Magnetic screen efficiency is higher, between 67~87db.
Mechanical properties:
Tensile property test is carried out to silver-plated carbon fiber/silicon rubber electromagnetic shielding material of the application, due to carbon fiber
It is added, the tensile strength of material is larger, reaches 2.5Mpa, has preferable mechanical performance, not easy to break.
Embodiment 3
A kind of electromagnetic shielding unit, the electromagnetic shielding unit are double-layer structure setting, and outer layer is ducting layer, and internal layer is to inhale wave
Layer, the ducting layer use red copper latten, and the suction wave layer fills silver-plated carbon fiber, carbon using silicon rubber as matrix
Fiber is corynebacterium, and random distribution is wherein.
The preparation process of the electromagnetic shielding unit are as follows:
S1, ducting layer use red copper latten material, and copper content is 76% in material, iron-content 13%, zinc content
It is 11%, ducting layer is with a thickness of 1mm；
S2, firstly, selecting carbon fiber, density 1.75g/cm, diameter is 5 μm, and carbon fiber is placed on 400 in batch-type furnace
30min is handled at DEG C, removes surface colloidal impurity；Then silver sulfate, ammonium chloride, boric acid, dodecyl sodium sulfate is taken to prepare electricity
Plating liquor, wherein content is followed successively by 120g/L, 16g/L, 15g/L, 2g/L, then uses ammonia water titration electroplating solution, makes its pH value
It is 4.5；Electroplating solution is placed in electroplanting device, using silver plate as anode in electroplanting device, carbon fiber is as cathode, anode
It is immersed in electroplating solution with cathode, in electroplating process, using mechanical stirring, and temperature is maintained at 30 DEG C, electroplating current
Density is 3.0A/cm2, silver coating obtains silver-plated carbon fiber with a thickness of 200nm；
S3, firstly, vinyltriethoxysilane is diluted, solvent is the solution that water and ethyl alcohol are prepared, each section ratio
For silane -20%, ethyl alcohol -72%, then silver-plated carbon fiber is put into the silane coupling agent through diluting and impregnates by water -8%
Silver-plated carbon fiber is cut into 3~5mm and 7~9mm length after drying by 1min；Then machined using open double rod refining glues,
Use silicon rubber for matrix, silver-plated carbon fiber is filler, and isopropanol is antifreezing agent, the silver-plated carbon fiber/silicon rubber of preparation flake
Material, wherein material thickness is 3mm, and silver-plated carbon fiber is uniformly distributed in material, and density is 100/cm2；Finally it is embedded into
To on the inside of above-mentioned ducting layer, double-layer structure electromagnetic shielding unit is made.
Electromagnetic shielding aspect:
Electromagnetic shielding performance test is carried out to the electromagnetic shielding unit of the present embodiment, using E5071C type Network Analyzer method
Blue coaxial hair test, temperature is 30 DEG C, and humidity is 50% (RH).
Upper table is that silver-plated carbon fiber density is 100/cm in the present embodiment electromagnetic shielding unit2When, test is answered
Electromagnetic shielding material electromagnet shield effect curve within the scope of 200~1200MHz is closed, material electromagnetic shielding curve is more gentle,
Electromagnet shield effect is higher, between 62~81db.
Mechanical properties:
Tensile property test is carried out to silver-plated carbon fiber/silicon rubber electromagnetic shielding material of the application, due to carbon fiber
It is added, the tensile strength of material is larger, reaches 2.3Mpa, has preferable mechanical performance, not easy to break.
Embodiment 4
A kind of electromagnetic shielding unit, the electromagnetic shielding unit are double-layer structure setting, and outer layer is ducting layer, and internal layer is to inhale wave
Layer, the ducting layer use red copper latten, and the suction wave layer fills silver-plated carbon fiber, carbon using silicon rubber as matrix
Fiber is corynebacterium, and random distribution is wherein.
The preparation process of the electromagnetic shielding unit are as follows:
S1, ducting layer use red copper latten material, and copper content is 76% in material, iron-content 13%, zinc content
It is 11%, ducting layer is with a thickness of 1mm；
S2, firstly, selecting carbon fiber, density 1.75g/cm, diameter is 5 μm, and carbon fiber is placed on 400 in batch-type furnace
30min is handled at DEG C, removes surface colloidal impurity；Then silver sulfate, ammonium chloride, boric acid, dodecyl sodium sulfate is taken to prepare electricity
Plating liquor, wherein content is followed successively by 120g/L, 16g/L, 15g/L, 2g/L, then uses ammonia water titration electroplating solution, makes its pH value
It is 4.5；Electroplating solution is placed in electroplanting device, using silver plate as anode in electroplanting device, carbon fiber is as cathode, anode
It is immersed in electroplating solution with cathode, in electroplating process, using mechanical stirring, and temperature is maintained at 30 DEG C, electroplating current
Density is 3.0A/cm2, silver coating obtains silver-plated carbon fiber with a thickness of 200nm；
S3, firstly, vinyltriethoxysilane is diluted, solvent is the solution that water and ethyl alcohol are prepared, each section ratio
For silane -20%, ethyl alcohol -72%, then silver-plated carbon fiber is put into the silane coupling agent through diluting and impregnates by water -8%
Silver-plated carbon fiber is cut into 3~5mm and 7~9mm length after drying by 1min；Then machined using open double rod refining glues,
Use silicon rubber for matrix, silver-plated carbon fiber is filler, and isopropanol is antifreezing agent, the silver-plated carbon fiber/silicon rubber of preparation flake
Material, wherein material thickness is 3mm, and silver-plated carbon fiber is uniformly distributed in material, and density is 120/cm2；Finally it is embedded into
To on the inside of above-mentioned ducting layer, double-layer structure electromagnetic shielding unit is made.
Electromagnetic shielding aspect:
Electromagnetic shielding performance test is carried out to the electromagnetic shielding unit of the present embodiment, using E5071C type Network Analyzer method
Blue coaxial hair test, temperature is 30 DEG C, and humidity is 50% (RH).
Upper table is that silver-plated carbon fiber density is 120/cm in the present embodiment electromagnetic shielding unit2When, test is answered
Electromagnetic shielding material electromagnet shield effect curve within the scope of 200~1200MHz is closed, material electromagnetic shielding curve is more gentle,
Electromagnet shield effect is higher, between 64~83db.
Mechanical properties:
Tensile property test is carried out to silver-plated carbon fiber/silicon rubber electromagnetic shielding material of the application, due to carbon fiber
It is added, the tensile strength of material is larger, reaches 2.7Mpa, has preferable mechanical performance, not easy to break.
The foregoing is merely preferred modes of the invention, are not intended to limit the invention, all in spirit and original of the invention
Within then, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of electromagnetic shielding unit, which is characterized in that the electromagnetic shielding unit is double-layer structure setting, and outer layer is guided wave
Layer, internal layer are to inhale wave layer, and the ducting layer uses red copper latten, and the suction wave layer is filled using silicon rubber as matrix
Silver-plated carbon fiber, carbon fiber are corynebacterium, and random distribution is wherein.
2. a kind of electromagnetic shielding unit according to claim 1, which is characterized in that in the red copper latten, copper contains
Amount is 76%, iron-content 13%, zinc content 11%.
3. a kind of electromagnetic shielding unit according to claim 2, which is characterized in that the ducting layer is with a thickness of 1mm.
4. a kind of electromagnetic shielding unit according to claim 2, which is characterized in that the suction wave layer is with a thickness of 3mm.
5. a kind of electromagnetic shielding unit according to claim 4, which is characterized in that in inhaling wave layer, the silver-plated carbon fiber
Dimension density is 80~120/cm2, it is respectively 3~5mm and 7~9mm that there are two types of length for tool.
6. a kind of electromagnetic shielding unit according to claim 5, which is characterized in that the 3~5mm and the plating of 7~9mm length
The mass ratio of silver-colored carbon fiber is 4:1.
7. a kind of electromagnetic shielding unit according to claim 1, which is characterized in that the carbon fiber density is 1.75g/
cm3, 5 μm of diameter.
8. a kind of electromagnetic shielding unit according to claim 7, which is characterized in that the silver-plated thickness of the silver-plated carbon fiber
Degree is 200nm.
9. a kind of electromagnetic shielding unit according to claim 7, which is characterized in that the preparation of the electromagnetic shielding unit
Journey:
S1 prepares ducting layer
S2 handles carbon fiber thermal, removes surface impurity；Then electroplating solution is configured, using silver plate as anode, after heat treatment
Carbon fiber as cathode, anode and cathode are immersed in electroplating solution, obtain silver-plated carbon fiber by plating；
Silver-plated carbon fiber is put into the silane coupling agent through diluting and impregnates 1min by S3, cuts silver-plated carbon fiber after dry
At 3~5mm and 7~9mm length；Then using open double rod refining glue machinings, use silicon rubber for matrix, silver-plated carbon fiber
For filler, isopropanol is antifreezing agent, and wave layer is inhaled in preparation；
S4 will inhale on the inside of wave layer insertion ducting layer, obtain the electromagnetic shielding unit.
10. a kind of electromagnetic shielding unit according to claim 9, which is characterized in that described to handle carbon fiber thermal in S2
Specifically: carbon fiber is placed in batch-type furnace at 400 DEG C and handles 30min,
The electroplating solution process for preparation are as follows: take silver sulfate, ammonium chloride, boric acid, dodecyl sodium sulfate to prepare electroplating solution,
Middle content is followed successively by 120g/L, 16g/L, 15g/L, 2g/L, then uses ammonia water titration electroplating solution, makes its pH value 4.5；
It is described that silver-plated carbon fiber is obtained by plating specifically: in electroplating process, using mechanical stirring, and temperature is maintained at 30
DEG C, electroplating current density 3.0A/cm2, silver coating is with a thickness of 200nm.
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| CN201811231969.4A CN109168314A (en) | 2018-10-22 | 2018-10-22 | A kind of electromagnetic shielding unit |
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| CN201811231969.4A CN109168314A (en) | 2018-10-22 | 2018-10-22 | A kind of electromagnetic shielding unit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111548629A (en) * | 2020-06-28 | 2020-08-18 | 太仓碧奇新材料研发有限公司 | Conductive rubber for 5G communication base station and preparation method thereof |
| CN113430819A (en) * | 2021-06-24 | 2021-09-24 | 浙江理工大学桐乡研究院有限公司 | Carbon fiber electromagnetic shielding material and preparation method thereof |
| CN114717843A (en) * | 2022-04-08 | 2022-07-08 | 富优特(山东)新材料科技有限公司 | Flexible wave-absorbing composite material with adjustable performance and preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111548629A (en) * | 2020-06-28 | 2020-08-18 | 太仓碧奇新材料研发有限公司 | Conductive rubber for 5G communication base station and preparation method thereof |
| CN113430819A (en) * | 2021-06-24 | 2021-09-24 | 浙江理工大学桐乡研究院有限公司 | Carbon fiber electromagnetic shielding material and preparation method thereof |
| CN114717843A (en) * | 2022-04-08 | 2022-07-08 | 富优特(山东)新材料科技有限公司 | Flexible wave-absorbing composite material with adjustable performance and preparation method and application thereof |
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Application publication date: 20190108 |