CN108882664A - A kind of conducting foam suitable for electromagnetic shielding - Google Patents
A kind of conducting foam suitable for electromagnetic shielding Download PDFInfo
- Publication number
- CN108882664A CN108882664A CN201810819636.7A CN201810819636A CN108882664A CN 108882664 A CN108882664 A CN 108882664A CN 201810819636 A CN201810819636 A CN 201810819636A CN 108882664 A CN108882664 A CN 108882664A
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- China
- Prior art keywords
- layer
- conducting foam
- electromagnetic shielding
- foamed cotton
- carbon nanotube
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Classifications
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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
Abstract
The invention discloses a kind of conducting foams suitable for electromagnetic shielding, sequentially include：External protection, foamed cotton layer, the first adhesive layer, metal foil layer, the second adhesive layer, above each layer are compounded to form the conducting foam；The upper and lower surfaces of the metal foil layer are respectively formed a nickel-titanium alloy film, and the foamed cotton layer has weepage holes, and carbon nanotube is filled in the weepage holes, and the carbon nanotube is porous spongy carbon nanotube block materials；The first surface of the nickel-titanium alloy film connects the carbon nanotube in foamed cotton layer and foamed cotton layer by the first adhesive layer, and the second surface of the nickel-titanium alloy film connects the second adhesive layer.Conducting foam provided by the invention can provide preferable bulk shielding performance and electric conductivity to electronic equipment in the space of closed narrow poor heat radiation.
Description
Technical field
The present invention relates to conducting foam technical field more particularly to a kind of conducting foams suitable for electromagnetic shielding.
Background technique
Conducting foam is usually compound by conducting resinl by metal foil and foam, and passes through a series of processing, makes it have
Good surface conductivity and compressibility energy, so that it is suitable for realizing electricity in narrow space, the limited occasion of clossing pressure
Magnetic screen is widely used in electronic cabinet, casing, indoor cabinet, industrial equipment, laptop, mobile communication equipment etc..Institute
Stating electromagnetic shielding is exactly the isolation that electric field, magnetic field and electromagnetic wave are carried out between two spaces region, usually in two skies
Between region impose the shields such as metal cover to realize, with shield by component, circuit, sub-assembly, cable or whole system
Interference source be surrounded, prevent their influences by external electromagnetic field, and to the corresponding electromagnetic field of external radiation.It is existing to lead
Conducting resinl between the metal foil layer and foam of electric foam is influenced by temperature larger, its bonding under high temperature poor heat radiation environment
Stickiness is inadequate, is easy to appear and loosens and generate gap, influences its whole shield effectiveness.
Summary of the invention
The purpose of the present invention is to provide a kind of conducting foams suitable for electromagnetic shielding, are suitable in closed narrow heat dissipation
In bad space, preferable bulk shielding performance and electric conductivity are provided to electronic equipment.
To achieve the above object, technical scheme is as follows：
A kind of conducting foam suitable for electromagnetic shielding sequentially includes：External protection, foamed cotton layer, the first adhesive layer, metal
Layers of foil, the second adhesive layer, above each layer are compounded to form the conducting foam；The upper and lower surfaces of the metal foil layer are respectively formed one
Nickel-titanium alloy film, the foamed cotton layer have weepage holes, are filled with carbon nanotube in the weepage holes, the carbon nanotube is more
The spongy carbon nanotube block materials in hole；The first surface of the nickel-titanium alloy film by the first adhesive layer connect foamed cotton layer with
And the carbon nanotube in foamed cotton layer, the second surface of the nickel-titanium alloy film connect the second adhesive layer.
In a kind of optional embodiment：After the porous spongy carbon nanotube block materials are cut, have upper
Portion and lower part, and the assembly being interference fitted with the weepage holes；The top is tapered, and the lower part is cylinder.
In a kind of optional embodiment：The nickel-titanium alloy film is formed in the metal by physical vapour deposition (PVD)
The upper and lower surfaces of layers of foil, plating material include metallic nickel, Titanium, metallic copper.
In a kind of optional embodiment：The metal foil layer is aluminium foil.
In a kind of optional embodiment：The external protection is PET polyester.
In a kind of optional embodiment：The foamed cotton layer is PU foam.
In a kind of optional embodiment：First adhesive layer, the second adhesive layer are conducting resinl.
In a kind of optional embodiment：The conducting foam further includes release layer, and the release layer is pressed on described
Second adhesive layer, the release layer are release film.
Compared to the prior art, the present invention has the advantage that：
(1) nickel-titanium alloy film containing nickel metal and titanium can absorb electronics member device as a kind of absorbing material
The most electromagnetic wave that part is issued, and the nickel-titanium alloy film is combined with conductive metal foil, and is coated so that not by
The electromagnetic wave that nickel-titanium alloy film outer layer absorbs reflects in conductive metal foil, further by the internal layer of nickel-titanium alloy film
It absorbs, to guarantee effectiveness under normal conditions；
(2) when conducting foam is heated, nickel-titanium alloy film, which has, restores former shaped trend and potential energy, for matching
Foamed cotton layer, the metal foil layer of conjunction, and the first adhesive layer therebetween can form corresponding tensile stress so that the two combine it is tight
It is close, to prevent from forming corresponding gap between foamed cotton layer and metal foil layer so that the electric conductivity of the conducting foam and
Electromagnetic shielding performance is more stable when heated；
(3) when conducting foam is bent in assembling process, the leakage pore volume in foamed cotton layer reduces, and carbon nanometer
Lower part after pipe is cut is connected to the metal foil layer with nickel-titanium alloy film by the first adhesive layer, and carbon nanotube is leaking
It is compressed in hole, and the construction of upper part taper then makes it when with the trend moved down with bigger resistance,
Conducting foam is when itself receives bending, since the tensile stress that metal foil layer generates can generate the stress of corresponding overbending direction, and
The stress that there is preferable elastic-restoring force can offset above-mentioned generation for above-mentioned foamed cotton layer and the carbon nanotube in it, so that golden
Shape, structure, electric conductivity and the shielding properties for belonging to foil are unaffected, and conducting resinl can be selected in first adhesive layer, into one
Step promotes the electric conductivity and shielding properties of conducting foam；
(4) carbon nano-tube material all has excellent performance, and flexibility with higher, energy at thermally conductive, conductive aspect
Enough mechanical strengths for effectively improving conducting foam in all cases, and maintain its original impedance.
Detailed description of the invention
Fig. 1 shows the structural schematic diagram of conducting foam of the present invention.
Specific embodiment
Fig. 1 is please referred to, the embodiment of the present invention discloses a kind of conducting foam suitable for electromagnetic shielding, sequentially includes：Outside
Protective layer 1, foamed cotton layer 2, the first adhesive layer 3, metal foil layer 4, the second adhesive layer 5, above each layer are compounded to form the conductive bubble
Cotton.
It is respectively formed a nickel-titanium alloy film 41 in the upper and lower surfaces of the metal foil layer 4, specifically, the Nitinol
Film 41 is formed in the upper and lower surfaces of the metal foil layer by physical vapour deposition (PVD), plating material include metallic nickel, Titanium with
And metallic copper, and the metal foil layer is aluminium foil.
The foamed cotton layer 2 has weepage holes, and carbon nanotube 21 is filled in the weepage holes, and the carbon nanotube is porous
Spongy carbon nanotube block materials.After the porous spongy carbon nanotube block materials are cut, there is upper and lower part,
And the assembly being interference fitted with the weepage holes；The top is tapered, and the lower part is cylinder.
The first surface of the nickel-titanium alloy film 41 is connected in foamed cotton layer 2 and foamed cotton layer by the first adhesive layer 3
The second surface of carbon nanotube 21, the nickel-titanium alloy film 41 connects the second adhesive layer 5.
Working principle of the present invention introduced below under application structure as above, the Nitinol containing nickel metal and titanium
Film 41 can absorb the most electromagnetic wave that is issued of electronic component as a kind of absorbing material, and the Nitinol
Film is combined with conductive metal foil, and is coated, so that the electromagnetic wave not absorbed by nickel-titanium alloy film outer layer is in conductive gold
Belong to and being reflected in foil, further absorbed by the internal layer of nickel-titanium alloy film, to guarantee electromagnetic shielding under normal conditions
Effect.
When conducting foam is heated, nickel-titanium alloy film 41, which has, restores former shaped trend and potential energy, for matching
Foamed cotton layer 2, the metal foil layer 4 of conjunction, and the first adhesive layer 3 therebetween can form corresponding tensile stress, so that the two combines
Closely, to prevent from forming corresponding gap between foamed cotton layer 2 and metal foil layer 4, so that the electric conductivity of the conducting foam
It can be more stable when heated with electromagnetic shielding performance.
Further, since the assembly space of electronic product is small, conventional conductive foam is typically due to bend in this process,
Further such that the metal foil layer in it is difficult to the deformation replied, its conductive and shielding properties is influenced.And of the invention real
It applies in example, when conducting foam is bent in assembling process, the leakage pore volume in foamed cotton layer 2 reduces, and carbon nanotube
21 be cut after lower part the metal foil layer 4 with nickel-titanium alloy film is connected to by the first adhesive layer 3, carbon nanotube is being seeped
It is compressed in leak hole, and the construction of upper part taper then makes it when with the trend moved down with bigger resistance,
In conducting foam when itself receives bending, since the tensile stress that metal foil layer 4 generates can generate the stress of corresponding overbending direction,
And the stress that there is preferable elastic-restoring force can offset above-mentioned generation for above-mentioned foamed cotton layer 2 and the carbon nanotube 21 in it,
So that the shape, structure of metal foil, electric conductivity and shielding properties are unaffected, and conduction can be selected in first adhesive layer 3
Glue further promotes the electric conductivity and shielding properties of conducting foam.Also, carbon nano-tube material is thermally conductive, conductive aspect is equal
With excellent performance, and flexibility with higher, the mechanical strength of conducting foam can be effectively improved in all cases,
And maintain its original impedance.
Some preferred embodiments in the present embodiment include that the external protection 1 is PET polyester；The foamed cotton layer 2 is PU
Foam；First adhesive layer 3, the second adhesive layer 5 are conducting resinl.The conducting foam further includes release layer 6, described release
Together in second adhesive layer, the release layer is release film for lamination.
The above description is only a preferred embodiment of the present invention, is not intended to limit its scope of the patents, all to utilize the present invention
Equivalent structure transformation made by specification and accompanying drawing content is directly or indirectly used in other related technical areas, similarly
It is included within the scope of the present invention.
Claims (8)
1. a kind of conducting foam suitable for electromagnetic shielding, which is characterized in that sequentially include：External protection, foamed cotton layer, first are glued
Layer, metal foil layer, the second adhesive layer are connect, above each layer is compounded to form the conducting foam；The upper and lower surfaces of the metal foil layer
It is respectively formed a nickel-titanium alloy film, the foamed cotton layer has weepage holes, is filled with carbon nanotube in the weepage holes, the carbon is received
Mitron is porous spongy carbon nanotube block materials；The first surface of the nickel-titanium alloy film is connected by the first adhesive layer
The second surface of carbon nanotube in foamed cotton layer and foamed cotton layer, the nickel-titanium alloy film connects the second adhesive layer.
2. a kind of conducting foam suitable for electromagnetic shielding as described in claim 1, it is characterised in that：The porous spongy
After carbon nanotube block materials are cut, there is upper and lower part, and the assembly being interference fitted with the weepage holes；It is described
Top is tapered, and the lower part is cylinder.
3. a kind of conducting foam suitable for electromagnetic shielding as claimed in claim 2, it is characterised in that：The Nitinol is thin
Film is formed in the upper and lower surfaces of the metal foil layer by physical vapour deposition (PVD), and plating material includes metallic nickel, Titanium, metal
Copper.
4. a kind of conducting foam suitable for electromagnetic shielding as claimed in claim 3, it is characterised in that：The metal foil layer is
Aluminium foil.
5. a kind of conducting foam suitable for electromagnetic shielding as claimed in claim 4, it is characterised in that：The external protection is
PET polyester.
6. a kind of conducting foam suitable for electromagnetic shielding as claimed in claim 4, it is characterised in that：The foamed cotton layer is PU
Foam.
7. a kind of conducting foam suitable for electromagnetic shielding as claimed in claim 3, it is characterised in that：First bonding
Layer, the second adhesive layer are conducting resinl.
8. a kind of conducting foam suitable for electromagnetic shielding as described in any one of claim 4-7, it is characterised in that：It is described
Conducting foam further includes release layer, and the release layer is pressed on second adhesive layer, and the release layer is release film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810819636.7A CN108882664B (en) | 2018-07-24 | 2018-07-24 | Conductive foam suitable for electromagnetic shielding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810819636.7A CN108882664B (en) | 2018-07-24 | 2018-07-24 | Conductive foam suitable for electromagnetic shielding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108882664A true CN108882664A (en) | 2018-11-23 |
| CN108882664B CN108882664B (en) | 2020-04-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810819636.7A Active CN108882664B (en) | 2018-07-24 | 2018-07-24 | Conductive foam suitable for electromagnetic shielding |
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| CN (1) | CN108882664B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110336576A (en) * | 2019-06-26 | 2019-10-15 | 维沃移动通信有限公司 | Electric installation and terminal device |
| CN110519980A (en) * | 2019-09-16 | 2019-11-29 | 苏州盛达飞智能科技股份有限公司 | A kind of electromagnetic shielding conductive foam and preparation method thereof |
| CN116916640A (en) * | 2023-09-12 | 2023-10-20 | 晋江市高威电磁科技股份有限公司 | Pyramid cotton and flexible shielding material composite structure and heat seal connection method thereof |
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| EP2121862A1 (en) * | 2007-01-17 | 2009-11-25 | Joinset Co. Ltd. | Conductive pressure sensitive adhesive tape |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110336576A (en) * | 2019-06-26 | 2019-10-15 | 维沃移动通信有限公司 | Electric installation and terminal device |
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| CN110519980A (en) * | 2019-09-16 | 2019-11-29 | 苏州盛达飞智能科技股份有限公司 | A kind of electromagnetic shielding conductive foam and preparation method thereof |
| CN110519980B (en) * | 2019-09-16 | 2020-12-22 | 深圳市丰正昌精密科技有限公司 | Electromagnetic shielding conductive foam and preparation method thereof |
| CN116916640A (en) * | 2023-09-12 | 2023-10-20 | 晋江市高威电磁科技股份有限公司 | Pyramid cotton and flexible shielding material composite structure and heat seal connection method thereof |
| CN116916640B (en) * | 2023-09-12 | 2023-11-17 | 晋江市高威电磁科技股份有限公司 | Pyramid cotton and flexible shielding material composite structure and heat seal connection method thereof |
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| Publication number | Publication date |
|---|---|
| CN108882664B (en) | 2020-04-21 |
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