CN104892829A - Wave-absorbing material for electromagnetic field shielding - Google Patents
Wave-absorbing material for electromagnetic field shielding Download PDFInfo
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- CN104892829A CN104892829A CN201510260481.4A CN201510260481A CN104892829A CN 104892829 A CN104892829 A CN 104892829A CN 201510260481 A CN201510260481 A CN 201510260481A CN 104892829 A CN104892829 A CN 104892829A
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Abstract
The invention discloses a wave-absorbing material for electromagnetic field shielding. The wave-absorbing material is composed of the following ingredients: 100 parts of a wave-absorbing powder, 20-35 parts of butyl acrylate monomer, 10-20 parts of acrylic acid, 20-35 parts of 2-ethylhexyl acrylate, 10-30 parts of methyl methacrylate, 1-3 parts of vinyl acetate, 0.1-1 part of methacrylic acid-2-hydroxyl ethyl, 0.5-2 parts of sodium polyacrylate and 0.4-1 part of methylethyl ketone peroxide. The wave-absorbing powder is composed of the following ingredients: BaFe12O19, nickel sesquioxide, nano-graphite powder, cobalt naphtenate, nonsaturated polyester and an acrylic acid leveling agent. Attenuation rate of electromagnetic wave at 2-10 GHz reaches 88%, which is beneficial to polymer gluing and uniform dispersion of mixed powders in the polymer. Thus, reliability of electromagnetic performance is guaranteed.
Description
Technical field
The invention belongs to technical field of electronic materials, particularly relate to a kind of for electromagnetic-field-shielded absorbing material.
Background technology
Along with the development of electron trade, increasing electric equipment products has come into the life of people, and the impact of the Electromagnetic Radiation on Environment that these products bring also increases day by day.The hertzian wave of electronic product release, brings electromagnetic interference can to other electronics of surrounding, make its operation irregularity; Also can work the mischief to HUMAN HEALTH simultaneously.Therefore, research and development can weaken the absorbing material of electromagnetic radiation, have become the heat subject that Materials science is paid close attention to.
Absorbing material refers to and effectively can absorb incident electromagnetic wave and the class material making it decay, and incident electromagnetic wave to be changed into heat energy or other form of energy to reach the object of inhaling ripple by different losses mechanism by it.In absorbing material, patch-type absorbing material thickness is thin, easy to use, for reduction electromagnetic radiation, prevents electromagnetic interference from having good effect, is relatively applicable to being applied in electronic product.And the main trend of electronic product development is microminiaturized, Highgrade integration, interiors of products space is relatively narrow and small.Therefore, under the prerequisite ensureing absorbing property, how material is manufactured to obtain face the biggest problem of the enough thin people of being.
Summary of the invention
The invention provides a kind of for electromagnetic-field-shielded absorbing material, this absorbing material reaches 88% in the electromagnetic rate of fall-off of 2 ~ 10GHz, both be conducive to polymer latex to glue, and also made mixed powder be uniformly dispersed in the polymer, thus ensure that the reliability of electromagnetic performance.
For achieving the above object, the technical solution used in the present invention is: a kind of for electromagnetic-field-shielded absorbing material, comprises as the graphite flake in reflecting layer, absorption layer and separated type material layer; The first adhesive layer is provided with between described graphite flake, absorption layer; The second adhesive layer is provided with between described absorption layer, separated type material layer;
Described suction ripple layer is composed of the following components:
Wave-absorbing powder 100 parts,
Butyl acrylate 20 ~ 35 parts,
10 ~ 20 parts, vinylformic acid,
Isooctyl acrylate monomer 20 ~ 35 parts,
Methyl methacrylate 10 ~ 30 parts,
Vinyl acetate between to for plastic 1 ~ 3 part,
2-hydroxyethyl methacrylate 0.1 ~ 1 part,
Sodium polyacrylate 0.5 ~ 2 part,
Methylethyl ketone peroxide 0.4 ~ 1 part;
Described wave-absorbing powder is composed of the following components:
BaFe
12o
19100 parts,
Nickel sesquioxide 38 ~ 42 parts,
Nano graphite powder 9 ~ 12 parts,
Naphthoic acid cobalt 12 ~ 22 parts,
Unsaturated polyester 50 ~ 60 parts,
Acrylic acid or the like flow agent 40 ~ 50 parts.
The technical scheme improved further in technique scheme is as follows:
1, in such scheme, BaFe in described wave-absorbing powder
12o
19, nickel sesquioxide, Nano graphite powder and naphthoic acid cobalt mix according to 10:4:1:2 weight ratio.
2, in such scheme, described separated type material layer is off-style paper layer or release film layer.
3, in such scheme, described first adhesive layer, the second adhesive layer are esters of acrylic acid adhesive layer.
4, in such scheme, described unsaturated polyester is formed by the synthesis of MALEIC ANHYDRIDE, Tetra hydro Phthalic anhydride and propylene glycol.
Because technique scheme is used, the present invention compared with prior art has following advantages:
The present invention is used for electromagnetic-field-shielded absorbing material, and it adopts composite wave-absorbing powder BaFe
12o
19100 parts, nickel sesquioxide, Nano graphite powder, naphthoic acid cobalt and butyl acrylate 20 ~ 35 parts, 10 ~ 20 parts, vinylformic acid, Isooctyl acrylate monomer 20 ~ 35 parts, methyl methacrylate 10 ~ 30, vinyl acetate between to for plastic 1 ~ 3, 2-hydroxyethyl methacrylate 0.1 ~ 1 part synergy, there is stronger electromaganic wave absorbing property, 88% is reached in the electromagnetic rate of fall-off of 2 ~ 10GHz, further interpolation sodium polyacrylate 0.5 ~ 2 part, methylethyl ketone peroxide 0.4 ~ 1 part, both be conducive to polymer latex to glue, also mixed powder is made to be uniformly dispersed in the polymer, thus ensure that the reliability of electromagnetic performance, secondly, be equipped with unsaturated polyester in formula further, heat conductivility that acrylic acid or the like flow agent improves whole suction ripple layer, be conducive to the heat expanding produced by hertzian wave, improve stability and product work-ing life of performance.
Embodiment
Below in conjunction with embodiment, the invention will be further described:
Embodiment 1 ~ 4: a kind of for electromagnetic-field-shielded absorbing material, described absorbing material is composed of the following components, component and content as shown in table 1:
Table 1
| Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | |
| Wave-absorbing powder | 100 parts | 100 parts | 100 parts | 100 parts |
| Butyl acrylate | 20 parts | 32 parts | 30 parts | 28 parts |
| Vinylformic acid | 10 parts | 15 parts | 18 parts | 20 parts |
| Isooctyl acrylate monomer | 25 parts | 22 parts | 32 parts | 35 parts |
| Methyl methacrylate | 18 parts | 26 parts | 12 parts | 28 parts |
| Vinyl acetate between to for plastic | 1 part | 2.8 part | 1.8 part | 2 parts |
| 2-hydroxyethyl methacrylate | 0.2 part | 0.5 part | 0.8 part | 0.6 part |
| Sodium polyacrylate | 1.5 part | 2 parts | 1.2 part | 0.9 part |
| Methylethyl ketone peroxide | 0.6 part | 0.9 part | 0.6 part | 0.8 part |
The composition of content component as shown in Table 2 of described wave-absorbing powder:
Table 2
| Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | |
| BaFe 12O 19 | 100 parts | 100 parts | 100 parts | 100 parts |
| Nickel sesquioxide | 38 parts | 40 parts | 42 parts | 40 parts |
| Nano graphite powder | 12 parts | 10 parts | 9 parts | 10 parts |
| Naphthoic acid cobalt | 19 parts | 20 parts | 22 parts | 20 parts |
| Unsaturated polyester | 52 parts | 60 parts | 55 parts | 50 parts |
| Acrylic acid or the like flow agent | 40 parts | 50 parts | 48 parts | 42 parts |
Above-mentioned unsaturated polyester is formed by the synthesis of MALEIC ANHYDRIDE, Tetra hydro Phthalic anhydride and propylene glycol.
Embodiment 1 ~ 4 the maximum reflection coefficient of 2 ~ 18GHz frequency range and effective bandwidth as shown in table 3:
Table 3
| Inhale ripple layer thickness | Maximum reflection coefficient (dB) | ≤-8 dB effective bandwidths (GHz) | |
| Embodiment 1 | 0.2mm | -21 | 2~13 |
| Embodiment 2 | 0.4mm | -23 | 2~15 |
| Embodiment 3 | 0.6mm | -30 | 2~16 |
| Embodiment 4 | 0.8mm | -35 | 2~18 |
The hertzian wave that electronic product discharges by suction ripple layer converts the energy of heat energy or other form to reach the effect reducing electromagnetic radiation in the mode such as electrical loss, magnetic loss, within the scope of 2 ~ 18GHz, there is good absorption, the reflection of electromagnetic wave resorption ripple layer of incidence can be formed re-absorption effect.
Above-described embodiment is used for the preparation technology of electromagnetic-field-shielded absorbing material, comprises the following steps:
The first step: by BaFe
12o
19100 parts, nickel sesquioxide 38 ~ 42 parts, Nano graphite powder 9 ~ 12 parts, naphthoic acid cobalt 18 ~ 22 parts, unsaturated polyester 50 ~ 60 parts, acrylic acid or the like flow agent 40 ~ 50 parts mix, and stir 84 ~ 86 DEG C of conditions and form mixed powders;
Second step: butyl acrylate 20 ~ 35 parts, 10 ~ 20 parts, vinylformic acid, Isooctyl acrylate monomer 20 ~ 35 parts, methyl methacrylate 10 ~ 30, vinyl acetate between to for plastic 1 ~ 3,2-hydroxyethyl methacrylate 0.1 ~ 1 part, sodium polyacrylate 0.5 ~ 2 part are mixed with the mixed powder of the first step, and through high speed agitator dispersion 1 ~ 2 hour, thus mix formation mixture;
3rd step: be incubated after in a kettle. the mixture of second step being heated to 80 ~ 85 DEG C, divide in insulating process and add methylethyl ketone peroxide 0.4 ~ 1 part acquisition suction ripple mixed solution for 1 ~ 3 time, described soaking time is 4 ~ 10 hours;
4th step: the suction ripple mixed solution that the 3rd step obtains is coated on substrate;
5th step: baking is carried out to the suction ripple mixed solution in the 4th step and forms suction ripple layer.
Adopt above-mentioned for electromagnetic-field-shielded absorbing material time, there is stronger electromaganic wave absorbing property, 88% is reached in the electromagnetic rate of fall-off of 2 ~ 10GHz, further interpolation sodium polyacrylate 0.5 ~ 2 part, methylethyl ketone peroxide 0.4 ~ 1 part, both be conducive to polymer latex to glue, also make mixed powder be uniformly dispersed in the polymer, thus ensure that the reliability of electromagnetic performance; Secondly, be equipped with unsaturated polyester in formula further, heat conductivility that acrylic acid or the like flow agent improves whole suction ripple layer, be conducive to the heat expanding produced by hertzian wave, improve stability and product work-ing life of performance.
Above-described embodiment, only for technical conceive of the present invention and feature are described, its object is to person skilled in the art can be understood content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalences done according to spirit of the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (3)
1. for an electromagnetic-field-shielded absorbing material, it is characterized in that: described absorbing material is composed of the following components:
Wave-absorbing powder 100 parts,
Butyl acrylate 20 ~ 35 parts,
10 ~ 20 parts, vinylformic acid,
Isooctyl acrylate monomer 20 ~ 35 parts,
Methyl methacrylate 10 ~ 30 parts,
Vinyl acetate between to for plastic 1 ~ 3 part,
2-hydroxyethyl methacrylate 0.1 ~ 1 part,
Sodium polyacrylate 0.5 ~ 2 part,
Methylethyl ketone peroxide 0.4 ~ 1 part;
Described wave-absorbing powder is composed of the following components:
BaFe
12o
19100 parts,
Nickel sesquioxide 38 ~ 42 parts,
Nano graphite powder 9 ~ 12 parts,
Naphthoic acid cobalt 18 ~ 22 parts,
Unsaturated polyester 50 ~ 60 parts,
Acrylic acid or the like flow agent 40 ~ 50 parts.
2. according to claim 1 for electromagnetic-field-shielded absorbing material, it is characterized in that: BaFe in described wave-absorbing powder
12o
19, nickel sesquioxide, Nano graphite powder and naphthoic acid cobalt mix according to 10:4:1:2 weight ratio.
3. according to claim 1 for electromagnetic-field-shielded absorbing material, it is characterized in that: described unsaturated polyester is formed by the synthesis of MALEIC ANHYDRIDE, Tetra hydro Phthalic anhydride and propylene glycol.
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| CN201510260481.4A CN104892829B (en) | 2015-05-21 | 2015-05-21 | For electromagnetic-field-shielded absorbing material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510260481.4A CN104892829B (en) | 2015-05-21 | 2015-05-21 | For electromagnetic-field-shielded absorbing material |
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| Publication Number | Publication Date |
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| CN104892829A true CN104892829A (en) | 2015-09-09 |
| CN104892829B CN104892829B (en) | 2017-12-12 |
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| CN201510260481.4A Active CN104892829B (en) | 2015-05-21 | 2015-05-21 | For electromagnetic-field-shielded absorbing material |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110144058A (en) * | 2019-04-26 | 2019-08-20 | 吉翔宝（太仓）离型材料科技发展有限公司 | A kind of release film with suction wave energy |
| CN113054332A (en) * | 2019-12-27 | 2021-06-29 | 阿里巴巴集团控股有限公司 | Filter and quantum chip measurement and control system |
| CN113493898A (en) * | 2020-04-08 | 2021-10-12 | 中国科学院物理研究所 | Ferromagnetic insulating material and preparation method and application thereof |
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| CN101830691A (en) * | 2009-03-13 | 2010-09-15 | 中国科学院福建物质结构研究所 | Method for synthesizing nano ferrite soft magnetic material |
| CN103740233A (en) * | 2014-01-08 | 2014-04-23 | 南京信息工程大学 | Micrometer wave absorbing coating material and preparation method thereof |
| CN103923337A (en) * | 2014-04-30 | 2014-07-16 | 湖南兆恒材料科技有限公司 | Composite polymethacrylimide foam wave absorption material |
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2015
- 2015-05-21 CN CN201510260481.4A patent/CN104892829B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101830691A (en) * | 2009-03-13 | 2010-09-15 | 中国科学院福建物质结构研究所 | Method for synthesizing nano ferrite soft magnetic material |
| CN103740233A (en) * | 2014-01-08 | 2014-04-23 | 南京信息工程大学 | Micrometer wave absorbing coating material and preparation method thereof |
| CN103923337A (en) * | 2014-04-30 | 2014-07-16 | 湖南兆恒材料科技有限公司 | Composite polymethacrylimide foam wave absorption material |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110144058A (en) * | 2019-04-26 | 2019-08-20 | 吉翔宝（太仓）离型材料科技发展有限公司 | A kind of release film with suction wave energy |
| CN113054332A (en) * | 2019-12-27 | 2021-06-29 | 阿里巴巴集团控股有限公司 | Filter and quantum chip measurement and control system |
| CN113054332B (en) * | 2019-12-27 | 2023-02-28 | 阿里巴巴集团控股有限公司 | Filter and quantum chip measurement and control system |
| CN113493898A (en) * | 2020-04-08 | 2021-10-12 | 中国科学院物理研究所 | Ferromagnetic insulating material and preparation method and application thereof |
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| CN104892829B (en) | 2017-12-12 |
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