CN108882664B - Conductive foam suitable for electromagnetic shielding - Google Patents
Conductive foam suitable for electromagnetic shielding Download PDFInfo
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- CN108882664B CN108882664B CN201810819636.7A CN201810819636A CN108882664B CN 108882664 B CN108882664 B CN 108882664B CN 201810819636 A CN201810819636 A CN 201810819636A CN 108882664 B CN108882664 B CN 108882664B
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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
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- Microelectronics & Electronic Packaging (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
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Abstract
The invention discloses a conductive foam suitable for electromagnetic shielding, which sequentially comprises: the conductive foam comprises an outer protective layer, a foam layer, a first adhesive layer, a metal foil layer and a second adhesive layer, wherein the outer protective layer, the foam layer, the first adhesive layer, the metal foil layer and the second adhesive layer are compounded to form the conductive foam; the upper surface and the lower surface of the metal foil layer are both provided with a nickel-titanium alloy film, the foam layer is provided with leakage holes, carbon nano tubes are filled in the leakage holes, and the carbon nano tubes are porous spongy carbon nano tube block materials; the first surface of the nickel-titanium alloy film is connected with the foam layer and the carbon nanotubes in the foam layer through the first bonding layer, and the second surface of the nickel-titanium alloy film is connected with the second bonding layer. The conductive foam provided by the invention can provide better overall shielding performance and conductive performance for electronic equipment in a closed narrow space with poor heat dissipation.
Description
Technical Field
The invention relates to the technical field of conductive foam, in particular to conductive foam suitable for electromagnetic shielding.
Background
The conductive foam is generally compounded by metal foil and foam through conductive adhesive, and has good surface conductivity and compressibility after a series of treatments, so that the conductive foam is suitable for realizing electromagnetic shielding in narrow space and limited closing pressure and is widely applied to electronic cabinets, machine shells, indoor cabinets, industrial equipment, notebook computers, mobile communication equipment and the like. The electromagnetic shielding is to isolate an electric field, a magnetic field and an electromagnetic wave between two spatial regions, and is usually implemented by applying a shielding body such as a metal shield to the two spatial regions, and the shielding body is used to surround the components, circuits, assemblies, cables or interference sources of the whole system, so as to prevent the components, the circuits, the assemblies, the cables or the interference sources from being influenced by an external electromagnetic field and radiate a corresponding electromagnetic field outwards. The influence of temperature is great to the conducting resin between the cotton metal foil layer of current electrically conductive bubble and the bubble, and its stickness of bonding is not enough under the not good environment of high temperature heat dissipation, appears taking off easily and produces the clearance, influences its holistic shielding effectiveness.
Disclosure of Invention
The invention aims to provide conductive foam suitable for electromagnetic shielding, which is suitable for providing better overall shielding performance and conductive performance for electronic equipment in a closed narrow space with poor heat dissipation.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a conductive foam suitable for electromagnetic shielding, comprising in order: the conductive foam comprises an outer protective layer, a foam layer, a first adhesive layer, a metal foil layer and a second adhesive layer, wherein the outer protective layer, the foam layer, the first adhesive layer, the metal foil layer and the second adhesive layer are compounded to form the conductive foam; the upper surface and the lower surface of the metal foil layer are both provided with a nickel-titanium alloy film, the foam layer is provided with leakage holes, carbon nano tubes are filled in the leakage holes, and the carbon nano tubes are porous spongy carbon nano tube block materials; the first surface of the nickel-titanium alloy film is connected with the foam layer and the carbon nanotubes in the foam layer through the first bonding layer, and the second surface of the nickel-titanium alloy film is connected with the second bonding layer.
In an alternative embodiment: after being cut, the porous spongy carbon nanotube block material is provided with an upper part and a lower part and is assembled with the leakage holes in an interference fit manner; the upper part is conical, and the lower part is a cylinder.
In an alternative embodiment: the nickel-titanium alloy thin films are formed on the upper surface and the lower surface of the metal foil layer through physical vapor deposition, and the plating materials of the nickel-titanium alloy thin films comprise metal nickel, metal titanium and metal copper.
In an alternative embodiment: the metal foil layer is an aluminum foil.
In an alternative embodiment: the outer protective layer is a PET polyester layer.
In an alternative embodiment: the foam layer is PU foam.
In an alternative embodiment: the first bonding layer and the second bonding layer are both conductive adhesive.
In an alternative embodiment: the conductive foam also comprises a release layer, the release layer is laminated on the second bonding layer, and the release layer is a release film.
Compared with the prior art, the invention has the following advantages:
(1) the nickel-titanium alloy film containing nickel metal and titanium metal can absorb most of electromagnetic waves emitted by electronic components as a wave absorbing material, and the nickel-titanium alloy film is combined with the conductive metal foil and coated, so that the electromagnetic waves which are not absorbed by the outer layer of the nickel-titanium alloy film are reflected in the conductive metal foil and further absorbed by the inner layer of the nickel-titanium alloy film, and the electromagnetic shielding effect under the conventional condition is ensured;
(2) when the conductive foam is heated, the nickel-titanium alloy film has the tendency of recovering the original shape and potential energy, corresponding tensile stress can be formed on the matched foam layer, the metal foil layer and the first bonding layer therebetween, so that the foam layer and the metal foil layer are tightly combined, and a corresponding gap is prevented from being formed between the foam layer and the metal foil layer, so that the conductive performance and the electromagnetic shielding performance of the conductive foam are more stable when being heated;
(3) when the conductive foam is bent in the assembling process, the volume of a leakage hole in the foam layer is reduced, the cut lower part of the carbon nano tube is connected to a metal foil layer with a nickel-titanium alloy film through a first bonding layer, the carbon nano tube is compressed in the leakage hole, and the conical structure of the upper part of the carbon nano tube enables the carbon nano tube to have larger resistance when having a downward movement trend;
(4) the carbon nanotube material has excellent heat and electricity conducting performance and high flexibility, and can raise the mechanical strength of the conducting foam effectively and maintain its original impedance.
Drawings
Fig. 1 shows a schematic structural diagram of the conductive foam of the present invention.
Detailed Description
Referring to fig. 1, an embodiment of the present invention discloses a conductive foam suitable for electromagnetic shielding, which sequentially includes: the conductive foam comprises an outer protection layer 1, a foam layer 2, a first bonding layer 3, a metal foil layer 4 and a second bonding layer 5, wherein the conductive foam is formed by compounding the layers.
A nickel-titanium alloy film 41 is formed on both the upper and lower surfaces of the metal foil layer 4, specifically, the nickel-titanium alloy film 41 is formed on the upper and lower surfaces of the metal foil layer by physical vapor deposition, the plating material thereof includes metal nickel, metal titanium and metal copper, and the metal foil layer is an aluminum foil.
The foam layer 2 is provided with a leakage hole, the leakage hole is filled with a carbon nano tube 21, and the carbon nano tube is a porous spongy carbon nano tube block material. After being cut, the porous spongy carbon nanotube block material is provided with an upper part and a lower part and is assembled with the leakage holes in an interference fit manner; the upper part is conical, and the lower part is a cylinder.
The first surface of the nickel-titanium alloy thin film 41 is connected with the foam layer 2 and the carbon nanotubes 21 in the foam layer through the first bonding layer 3, and the second surface of the nickel-titanium alloy thin film 41 is connected with the second bonding layer 5.
The working principle of the present invention using the above structure is described below, and the nickel-titanium alloy thin film 41 containing nickel metal and titanium metal, which is used as a wave absorbing material, can absorb most of the electromagnetic waves emitted by the electronic components, and the nickel-titanium alloy thin film is combined with the conductive metal foil and coated, so that the electromagnetic waves not absorbed by the outer layer of the nickel-titanium alloy thin film are reflected in the conductive metal foil and further absorbed by the inner layer of the nickel-titanium alloy thin film, thereby ensuring the electromagnetic shielding effect under the conventional conditions.
When the conductive foam is heated, the nickel-titanium alloy thin film 41 has the tendency of recovering the original shape and potential energy, corresponding tensile stress can be formed on the foam layer 2, the metal foil layer 4 and the first bonding layer 3 therebetween which are matched, so that the foam layer 2 and the metal foil layer 4 are tightly combined, a corresponding gap is prevented from being formed between the foam layer 2 and the metal foil layer 4, and the conductive performance and the electromagnetic shielding performance of the conductive foam are more stable when being heated.
In addition, because the assembly space of the electronic product is small, the conventional conductive foam is bent in the process, so that the metal foil layer in the conventional conductive foam is deformed difficultly to recover, and the conductive and shielding performance of the conventional conductive foam is affected. In the embodiment of the invention, when the conductive foam is bent in the assembling process, the volume of the leakage hole in the foam layer 2 is reduced, and the cut lower portion of the carbon nanotube 21 is connected to a metal foil layer 4 having a nitinol film through a first adhesive layer 3, the carbon nanotube is compressed in the leak hole, while its upper tapered configuration makes it more resistant in having a tendency to move downward, when the conductive foam is bent, the tensile stress generated by the metal foil layer 4 can generate stress corresponding to the bending direction, the foam layer 2 and the carbon nanotubes 21 therein have good elastic restoring force to offset the stress, so that the shape, structure, conductivity and shielding performance of the metal foil are not affected, and this first adhesive linkage 3 optional conductive adhesive, further promote the electric conductive property and the shielding property of electrically conductive bubble cotton. In addition, the carbon nanotube material has excellent heat conduction and electric conduction performance and higher flexibility, and can effectively improve the mechanical strength of the conductive foam under various conditions and maintain the original impedance.
Some preferred solutions in this embodiment include that the outer protective layer 1 is a PET polyester layer; the foam layer 2 is PU foam; the first bonding layer 3 and the second bonding layer 5 are both conductive adhesive. The conductive foam also comprises a release layer 6, the release layer is laminated on the second bonding layer, and the release layer is a release film.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings can be directly or indirectly applied to other related technical fields, and the same shall be included in the scope of the present invention.
Claims (8)
1. The utility model provides a conductive bubble is cotton suitable for electromagnetic shield which characterized in that includes in proper order: the conductive foam comprises an outer protective layer, a foam layer, a first adhesive layer, a metal foil layer and a second adhesive layer, wherein the outer protective layer, the foam layer, the first adhesive layer, the metal foil layer and the second adhesive layer are compounded to form the conductive foam; the upper surface and the lower surface of the metal foil layer are both provided with a nickel-titanium alloy film, the foam layer is provided with leakage holes, carbon nano tubes are filled in the leakage holes, and the carbon nano tubes are porous spongy carbon nano tube block materials; the first surface of the nickel-titanium alloy film is connected with the foam layer and the carbon nanotubes in the foam layer through the first bonding layer, and the second surface of the nickel-titanium alloy film is connected with the second bonding layer.
2. The conductive foam suitable for electromagnetic shielding according to claim 1, wherein: after being cut, the porous spongy carbon nanotube block material is provided with an upper part and a lower part and is assembled with the leakage holes in an interference fit manner; the upper part is conical, and the lower part is a cylinder.
3. The conductive foam suitable for electromagnetic shielding according to claim 2, wherein: the nickel-titanium alloy thin films are formed on the upper surface and the lower surface of the metal foil layer through physical vapor deposition, and the plating materials of the nickel-titanium alloy thin films comprise metal nickel, metal titanium and metal copper.
4. The conductive foam suitable for electromagnetic shielding according to claim 3, wherein: the metal foil layer is an aluminum foil.
5. The conductive foam suitable for electromagnetic shielding according to claim 4, wherein: the outer protective layer is a PET polyester layer.
6. The conductive foam suitable for electromagnetic shielding according to claim 4, wherein: the foam layer is PU foam.
7. The conductive foam suitable for electromagnetic shielding according to claim 3, wherein: the first bonding layer and the second bonding layer are both conductive adhesive.
8. The conductive foam suitable for electromagnetic shielding according to any one of claims 4-7, wherein: the conductive foam also comprises a release layer, the release layer is laminated on the second bonding layer, and the release layer is a 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 |
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| CN108882664A CN108882664A (en) | 2018-11-23 |
| CN108882664B true CN108882664B (en) | 2020-04-21 |
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| CN201810819636.7A Active CN108882664B (en) | 2018-07-24 | 2018-07-24 | Conductive foam suitable for electromagnetic shielding |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110010267A (en) * | 2019-04-30 | 2019-07-12 | 深圳市卓汉材料技术有限公司 | A kind of high heat-conductivity conducting elastomer |
| CN110336576B (en) * | 2019-06-26 | 2021-06-15 | 维沃移动通信有限公司 | Conductive device and terminal equipment |
| 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 |
| 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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| EP2121862A1 (en) * | 2007-01-17 | 2009-11-25 | Joinset Co. Ltd. | Conductive pressure sensitive adhesive tape |
| CN202531562U (en) * | 2011-09-29 | 2012-11-14 | 北京有色金属研究总院 | Shape memory alloy fastener |
| CN106793715A (en) * | 2017-02-28 | 2017-05-31 | 合肥钱锋特殊胶粘制品有限公司 | A kind of conducting foam |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203707402U (en) * | 2013-12-05 | 2014-07-09 | 番禺得意精密电子工业有限公司 | Electric connector |
| CN204111657U (en) * | 2014-09-04 | 2015-01-21 | 苏州斯迪克新材料科技股份有限公司 | A kind of uvioresistant Corrosion resistant adhesive tape |
| CN204309333U (en) * | 2014-11-18 | 2015-05-06 | 宁波锦泰新材料有限公司 | A kind of aluminium foil foam composite material |
| CN206873174U (en) * | 2017-05-18 | 2018-01-12 | 安安(中国)有限公司 | A kind of suede superfine fiber synthetic leather with higher scratch resistance anti-wear performance |
| CN207172893U (en) * | 2017-09-25 | 2018-04-03 | 京东方科技集团股份有限公司 | A kind of conducting foam adhesive tape and display panel |
| CN108034383A (en) * | 2017-12-28 | 2018-05-15 | 张家港康得新光电材料有限公司 | Shading foam tape, its preparation method and electronic equipment |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2121862A1 (en) * | 2007-01-17 | 2009-11-25 | Joinset Co. Ltd. | Conductive pressure sensitive adhesive tape |
| CN202531562U (en) * | 2011-09-29 | 2012-11-14 | 北京有色金属研究总院 | Shape memory alloy fastener |
| CN106793715A (en) * | 2017-02-28 | 2017-05-31 | 合肥钱锋特殊胶粘制品有限公司 | A kind of conducting foam |
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