CN108738291B - Film with shielding function - Google Patents
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- CN108738291B CN108738291B CN201810500531.5A CN201810500531A CN108738291B CN 108738291 B CN108738291 B CN 108738291B CN 201810500531 A CN201810500531 A CN 201810500531A CN 108738291 B CN108738291 B CN 108738291B
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Abstract
The invention discloses a film with a shielding function, wherein a wave absorbing layer is formed by mixing ferrite powder and a polymer matrix, a first adhesive layer is arranged between a PET (polyethylene terephthalate) insulating layer and a metal layer, a second adhesive layer is arranged between the metal layer and the wave absorbing layer, a third adhesive layer is arranged between the wave absorbing layer and a release material layer, a plurality of first prism convex parts and first prism convex parts are arranged on the surface of the metal layer, which is in contact with the wave absorbing layer, the heights of the first prism convex parts are greater than those of the second prism convex parts, the first prism convex parts and the second prism convex parts are alternately arranged, and intervals are reserved between the bottoms of the adjacent first prism convex parts and the adjacent second prism convex parts); the height ratio of the first prism to the second prism is 1: 0.6 to 0.4. The film metal layer with the shielding function can be absorbed for multiple times, so that the wave absorbing performance of the wave absorbing patch is remarkably improved, the excessive concentration of heat is avoided, and the heat diffusion is facilitated.
Description
Technical Field
The invention belongs to the technical field of electronic materials, and particularly relates to a film with a shielding function.
Background
Conventionally, a metal sheet or mesh widely used as a shielding material is heavy, and it takes time and labor to dispose the metal sheet or mesh in a housing of a device. Further, a metallic sheet or mesh tends to have a large anisotropy of electromagnetic wave absorption ability, that is, a tendency that the electromagnetic wave absorption ability is significantly reduced when the incident angle of the electromagnetic wave is increased. Electromagnetic waves released by electronic products can bring electromagnetic interference to other surrounding electronic equipment, so that the electronic equipment works abnormally; and also can cause harm to human health. At present, miniaturization and high integration are the main trends in the development of electronic products, and the internal space of the products is relatively narrow. Among the wave-absorbing materials, the patch type wave-absorbing material has the advantages of thin thickness, convenient use, good effect on reducing electromagnetic radiation and preventing electromagnetic interference, and is more suitable for being applied to electronic products. Therefore, the design and development of a patch-type electromagnetic wave absorbing material having a small thickness and a light weight and suitable for a narrow space have been the direction of efforts of those skilled in the art.
Disclosure of Invention
The invention provides a film with a shielding function, which improves the utilization rate of a metal layer for reflecting an electromagnetic field, can form multiple absorption due to the arrangement of the metal layer, and obviously improves the wave absorbing performance of a wave absorbing patch.
In order to achieve the purpose, the invention adopts the technical scheme that: a film with a shielding function comprises a PET insulating layer, a metal layer, a wave absorbing layer and a release material layer; the wave-absorbing layer is formed by mixing ferrite powder and a polymer matrix, a first adhesive layer is arranged between a PET (polyethylene terephthalate) insulating layer and a metal layer, a second adhesive layer is arranged between the metal layer and the wave-absorbing layer, a third adhesive layer is arranged between the wave-absorbing layer and a release material layer, a plurality of first prism bulges and first prism bulges are arranged on the surface of the metal layer contacting the wave-absorbing layer, the heights of the first prism bulges are greater than those of the second prism bulges, and the first prism bulges and the second prism bulges are alternately arranged and have intervals between the bottoms of the first prism bulges and the second prism bulges which are adjacent to each other);
the height ratio of the first prism to the second prism is 1: 0.6 to 0.4; the height of the first prism is 25 micrometers, the height of the second prism is 12 micrometers, and the thickness of the first adhesive layer is smaller than that of the second adhesive layer.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
according to the film with the shielding function, the surface of the metal layer, which is in contact with the wave-absorbing layer, is provided with the plurality of first prism convex parts and the plurality of first prism convex parts, the heights of the first prism convex parts are larger than those of the second prism convex parts, the first prism convex parts and the second prism convex parts are alternately arranged, and the bottoms of the adjacent first prism convex parts and the adjacent second prism convex parts are spaced, so that the utilization rate of a reflection electromagnetic field of the metal layer is improved, the metal layer can be absorbed for multiple times, and the wave-absorbing performance of the wave-absorbing patch is obviously improved; meanwhile, the temperature is increased due to the fact that a large amount of electromagnetic waves are absorbed in the use process, and the metal layer with the plurality of prism protrusions avoids over concentration of heat, is beneficial to heat diffusion, avoids membrane upwarping due to temperature rise, and improves stability of product performance; secondly, the use of the insulating layer and the PET film layer improves the strength of the material on the one hand.
Drawings
FIG. 1 is a schematic structural view of a film with a shielding function according to the present invention;
FIG. 2 is a schematic structural view of a film having a shielding function according to a comparative example;
fig. 3 is a partial schematic view of fig. 1.
In the above drawings: 1. a PET insulating layer; 2. a metal layer; 3. a wave-absorbing layer; 4. a release material layer; 5. a first adhesive layer; 6. a second adhesive layer; 7. a third adhesive layer; 81. a first prism projection; 82. a second prism projection; 9. and (4) spacing.
Detailed Description
The invention is further described with reference to the following figures and examples:
example (b): a film with a shielding function is shown in figure 1 and comprises a PET insulating layer 1, a metal layer 2, a wave absorbing layer 3 and a release material layer 4; a first adhesive layer 5 is arranged between the PET insulating layer 1 and the metal layer 2, a second adhesive layer 6 is arranged between the metal layer 2 and the wave absorbing layer 3, a third adhesive layer 7 is arranged between the wave absorbing layer 3 and the release material layer 4, the surface of the metal layer 2, which is in contact with the wave absorbing layer 3, is provided with a plurality of first prism protrusions 81 and first prism protrusions 81, the height of the first prism protrusions 81 is greater than that of the second prism protrusions 82, the first prism protrusions 81 and the second prism protrusions 82 are alternately arranged, and a gap 9 is reserved between the bottoms of the first prism protrusions 81 and the second prism protrusions 82 which are adjacent to each other.
The height of the first prism projection 81 is 25 μm, and the height of the second prism projection 82 is 12 μm. The thickness of the first adhesive layer 5 is smaller than that of the second adhesive layer 6, and the thickness of the second adhesive layer 6 is smaller than that of the third adhesive layer 7.
The wave absorbing layer is formed by mixing soft magnetic powder and a polymer matrix, converts electromagnetic waves released by electronic products into heat energy or energy in other forms in the modes of electric loss, magnetic loss and the like so as to achieve the effect of reducing electromagnetic radiation, has good absorption in the range of 2-18 GHz, and can reflect incident electromagnetic waves back to the wave absorbing layer to form multiple absorption.
The thickness of the PET insulating layer 1 is 6 microns; the first adhesive layer 5, the second adhesive layer 6 and the third adhesive layer 7 are all acrylate adhesive layers.
The thickness of the first adhesive layer 5 is smaller than that of the second adhesive layer 6.
When the film with the shielding function is adopted, the surface of the metal layer, which is in contact with the wave-absorbing layer, is provided with a plurality of first prism convex parts and first prism convex parts, the height of the first prism convex parts is greater than that of the second prism convex parts, the first prism convex parts and the second prism convex parts are alternately arranged, and intervals are reserved between the bottoms of the first prism convex parts and the second prism convex parts which are adjacent to each other, so that the utilization rate of a reflection electromagnetic field of the metal layer is improved, the metal layer can be absorbed for multiple times, and the wave-absorbing performance of the wave-absorbing patch is obviously improved; meanwhile, the temperature is increased due to the fact that a large amount of electromagnetic waves are absorbed in the use process, and the metal layer with the plurality of prism protrusions avoids over concentration of heat, is beneficial to heat diffusion, avoids membrane upwarping due to temperature rise, and improves stability of product performance; secondly, the use of the insulating layer and the PET film layer improves the strength of the material on the one hand.
Comparative example: a film with shielding function is shown in figure 2, and comprises a PET insulating layer 1, a metal layer 2, a wave absorbing layer 3 and a release material layer 4; the wave-absorbing layer 3 is formed by mixing ferrite powder and a polymer matrix, a first adhesive layer 5 is arranged between the PET insulating layer 1 and the metal layer 2, a second adhesive layer 6 is arranged between the metal layer 2 and the wave-absorbing layer 3, a third adhesive layer 7 is arranged between the wave-absorbing layer 3 and the release material layer 4, and a prism bulge 8 is arranged on the surface of the metal layer 2, which is in contact with the wave-absorbing layer 3.
And (3) testing performance: the wave absorbing performance in the 2GHZ-4GHZ frequency band is as follows:
| thickness of wave-absorbing layer | | 200μm | 500μm | 1 |
2㎜ | 5㎜ | |
| Comparative example | -2.1dB | -3.2dB | -5.3 dB | -7dB | -10.2 dB | -12.2 dB | |
| Examples | -2.5 dB | -3.6dB | -5.8dB | -7.7 dB | -10.8 dB | -14dB |
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (1)
1. The utility model provides a pad pasting with shielding function which characterized in that: the composite material comprises a PET insulating layer (1), a metal layer (2), a wave absorbing layer (3) and a release material layer (4); the wave absorbing layer (3) is formed by mixing ferrite powder and a polymer matrix, a first adhesive layer (5) is arranged between a PET (polyethylene terephthalate) insulating layer (1) and a metal layer (2), a second adhesive layer (6) is arranged between the metal layer (2) and the wave absorbing layer (3), a third adhesive layer (7) is arranged between the wave absorbing layer (3) and a release material layer (4), a plurality of first prism bulges (81) and second prism bulges (82) are arranged on the surface of the metal layer (2) in contact with the wave absorbing layer (3), the height of each first prism bulge (81) is greater than that of each second prism bulge (82), the first prism bulges (81) and the second prism bulges (82) are alternately arranged, and a gap (9) is reserved between the bottoms of the adjacent first prism bulges (81) and the second prism bulges (82);
the height ratio of the first prism protrusion (81) to the second prism protrusion (82) is 25: 12;
the height of the first prism convex part (81) is 25 mu m, the height of the second prism convex part (82) is 12 mu m, and the thickness of the first adhesive layer (5) is smaller than that of the second adhesive layer (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810500531.5A CN108738291B (en) | 2014-09-01 | 2014-09-01 | Film with shielding function |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410440407.6A CN104202957B (en) | 2014-09-01 | 2014-09-01 | The wave absorbing patch of use for electronic products |
| CN201810500531.5A CN108738291B (en) | 2014-09-01 | 2014-09-01 | Film with shielding function |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410440407.6A Division CN104202957B (en) | 2014-09-01 | 2014-09-01 | The wave absorbing patch of use for electronic products |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108738291A CN108738291A (en) | 2018-11-02 |
| CN108738291B true CN108738291B (en) | 2020-02-14 |
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Family Applications (4)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810500904.9A Active CN108728005B (en) | 2014-09-01 | 2014-09-01 | High heat conduction type wave-absorbing film |
| CN201410440407.6A Active CN104202957B (en) | 2014-09-01 | 2014-09-01 | The wave absorbing patch of use for electronic products |
| CN201810500531.5A Active CN108738291B (en) | 2014-09-01 | 2014-09-01 | Film with shielding function |
| CN201810500228.5A Active CN108811477B (en) | 2014-09-01 | 2014-09-01 | Electronic product film for reducing electromagnetic radiation |
Family Applications Before (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810500904.9A Active CN108728005B (en) | 2014-09-01 | 2014-09-01 | High heat conduction type wave-absorbing film |
| CN201410440407.6A Active CN104202957B (en) | 2014-09-01 | 2014-09-01 | The wave absorbing patch of use for electronic products |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810500228.5A Active CN108811477B (en) | 2014-09-01 | 2014-09-01 | Electronic product film for reducing electromagnetic radiation |
Country Status (1)
| Country | Link |
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| CN (4) | CN108728005B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104999735B (en) * | 2015-05-21 | 2017-12-12 | 斯迪克新型材料（江苏）有限公司 | Composite film-stuck with shielding electromagnetic field function |
| CN108481839A (en) * | 2017-05-19 | 2018-09-04 | 上海浦健科技有限公司 | A kind of device for absorbing negative polarity particle |
| CN113337248A (en) * | 2021-06-01 | 2021-09-03 | 浙江原邦材料科技有限公司 | Composite wave-absorbing material and preparation method thereof |
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| JP3703732B2 (en) * | 2000-05-01 | 2005-10-05 | 株式会社竹中工務店 | Pavement structure |
| JP2004134571A (en) * | 2002-10-10 | 2004-04-30 | Nippon Tokushu Toryo Co Ltd | Sound-absorption electromagnetic wave absorbing material |
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| CN202626089U (en) * | 2012-03-31 | 2012-12-26 | 常州宏巨电子科技有限公司 | Conductive cloth adhesive tape |
| CN103035981B (en) * | 2012-12-11 | 2015-02-11 | 电子科技大学 | Ultrathin metal membrane terahertz absorbed layer and preparation method thereof |
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- 2014-09-01 CN CN201810500904.9A patent/CN108728005B/en active Active
- 2014-09-01 CN CN201410440407.6A patent/CN104202957B/en active Active
- 2014-09-01 CN CN201810500531.5A patent/CN108738291B/en active Active
- 2014-09-01 CN CN201810500228.5A patent/CN108811477B/en active Active
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| CN1934293A (en) * | 2004-03-02 | 2007-03-21 | 三井金属矿业株式会社 | Surface-treated copper foil having grayed surface, process for producing the same and electromagnetic wave shielding conductive mesh for front panel of plasma display wherein use is made of the surfac |
| JP2011100139A (en) * | 2006-12-11 | 2011-05-19 | Dainippon Printing Co Ltd | Optical sheet and display device |
| CN101772996A (en) * | 2007-08-03 | 2010-07-07 | 大自达系统电子株式会社 | Printed wiring board-use screened film and printed wiring board |
| JP2011030323A (en) * | 2009-07-23 | 2011-02-10 | Yazaki Corp | Shield member and wire harness |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN108811477A (en) | 2018-11-13 |
| CN104202957A (en) | 2014-12-10 |
| CN108728005B (en) | 2020-03-06 |
| CN104202957B (en) | 2018-09-18 |
| CN108728005A (en) | 2018-11-02 |
| CN108738291A (en) | 2018-11-02 |
| CN108811477B (en) | 2020-02-14 |
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