CN104616854A - Electromagnetic interference noise suppression sheet and manufacturing method thereof - Google Patents
Electromagnetic interference noise suppression sheet and manufacturing method thereof Download PDFInfo
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- CN104616854A CN104616854A CN201410852297.4A CN201410852297A CN104616854A CN 104616854 A CN104616854 A CN 104616854A CN 201410852297 A CN201410852297 A CN 201410852297A CN 104616854 A CN104616854 A CN 104616854A
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Abstract
The invention discloses an electromagnetic interference noise suppression sheet and a manufacturing method of the electromagnetic interference noise suppression sheet. The electromagnetic interference noise suppression sheet comprises primary constituents and auxiliary constituents. The primary constituents comprise molypermalloy powder, aqueous adhesives and absolute ethyl alcohol, and the aqueous adhesives are waterborne polyurethane. The auxiliary constituents comprise water in waterborne polyurethane and acetone. The manufacturing method of the electromagnetic interference noise suppression sheet comprises the steps that an appropriate amount of the molypermalloy powder is added into a planetary ball mill to be mixed, a forward and reverse alternative rotation process ball grinder is adopted, and flat soft magnetic alloy powder is obtained; oxygen-free environment annealing is carried out on the flat soft magnetic alloy powder; a flake-lie film is manufactured in a flow casting mode by the adoption of a doctor blade method, then a magnetic field parallel to a film plane is additionally provided to carry out orientation on the flat soft magnetic alloy powder, and meanwhile a solvent in the constituents is removed; hot pressing processing is carried out on the film formed in the flow casting mode under the condition with the temperature lower than the vitrification transformation temperature of the waterborne polyurethane, and therefore the electromagnetic interference noise suppression sheet is obtained. The electromagnetic interference noise suppression sheet and the manufacturing method have the advantages that safety and environmental protection of the manufacturing method of the sheet are guaranteed, and the electromagnetic property of the sheet is improved to the maximum extent.
Description
Technical field
The present invention relates to and belong to magnetically soft alloy material correlative technology field, refer in particular to a kind of electromagnetic interference noise and suppress sheet material and preparation method thereof.
Background technology
Along with the raising of national economy and becoming stronger day by day of China's science and technology, meet the demand that people's electronic equipment updates, miscellaneous electronic product is also more and more subject to liking of broad masses, electronic equipment is towards trend development that is miniaturized, integrated and high frequency, and the electromagnetic compatibility problem of thing followed high-frequency range is also serious all the more.Electromagnetic interference noise suppresses sheet to rely on, and the features such as it is flexible, ultra-thin, applying frequency wide ranges, easily cutting, attachment is convenient, secondary radiation is little are paid close attention to widely.
Electromagnetic interference noise suppress sheet be a kind of there is absorbing property absorbent and the lamellar product that is composited of macromolecular material.Because the magnetic-field component of near field electromagnetic ripple is large, loss is mainly based on magnetic loss, and wave absorbing agent is generally magnetic material.Such noise suppression sheet can directly be covered on noise generation source, and such as, on CPU, IC, PCB and FPC circuit, the radiated noise produced when both significantly can eliminate their work, also can keep apart the interference signal in the external world.In addition, noise suppression sheet effectively can also reduce the interference etc. of the crosstalk between circuit, the electromagnetic induction coupling reducing associated electronic circuitry, reduction electromagnetic radiation, attenuating RF circuit.Such as, adopt in the contactless IC tag of RFID technique, suppressing sheet by adding electromagnetic interference noise between label and metallic plate, alternating electromagnetic field effectively can be avoided to be subject to metal swirl attenuation, thus increase reading/writing distance; In wireless charging technical field, charging device effectively can be avoided to produce skin effect because of electronics eddy current by increasing noise suppression sheet, providing loop to sympathetic magnetic field simultaneously, thus effectively improving charge efficiency.Well imagine, along with the application of this product, electromagnetic interference noise suppresses sheet will obtain application space widely.
At present, electromagnetic interference noise suppresses sheet mainly to adopt the water-insoluble organic materials such as epoxy resin, haloflex, polyvinyl chloride, polyamide, polyvinyl alcohol to be used as binding agent, mostly need to adopt more organic solvent and plasticizer or curing agent, have certain pollution to environment.There is the shortcoming that sheet material magnetic permeability is low simultaneously.
Summary of the invention
The present invention suppresses non-aqueous organic material in sheet material preparation process to be used as the shortcomings such as binding agent causes harmful effect to environment and sheet material magnetic permeability is low to overcome in prior art electromagnetic interference noise, provides a kind ofly to improve magnetic permeability and the electromagnetic interference noise of safety and environmental protection suppresses sheet material and preparation method thereof.
To achieve these goals, the present invention is by the following technical solutions:
A kind of electromagnetic interference noise suppresses sheet material, and comprise principal component and accessory ingredient, described principal component comprises iron nickel molybdenum, aqueous binders and absolute ethyl alcohol, and described aqueous binders is aqueous polyurethane; Described accessory ingredient comprises water in aqueous polyurethane and acetone.
In the present invention, electromagnetic interference noise suppresses sheet material when selecting this water-soluble glue of aqueous polyurethane to be binding agent, while guaranteeing that electromagnetic interference noise suppresses sheet material safe preparation process, environmental protection, at utmost improves the electromagnetic performance of material.
As preferably, described principal component with respective mass percentage content is: iron nickel molybdenum is 40 ~ 60wt%, absolute ethyl alcohol is 20 ~ 40wt%, aqueous polyurethane is 10 ~ 26wt%.
As preferably, described accessory ingredient, relative to described principal component total weight, accounts for principal component total weight in the percentage by weight of its reference material water and acetone and is respectively 7 ~ 12wt% and 0.4 ~ 0.8wt%.
Suppress sheet material for above-mentioned electromagnetic interference noise, present invention also offers the preparation method that a kind of electromagnetic interference noise suppresses sheet material, concrete operation step is as follows:
(1) appropriate iron nickel molybdenum raw meal is added planetary ball mill mixing, adopt the forward and reverse alternately rotating technics ball milling after improving, obtain flattening soft-magnetic alloy powder;
(2) flattening soft-magnetic alloy powder is carried out oxygen-free environment annealing;
(3) adopt doctor blade method for tape-casting to make sheet film, then by the additional magnetic field parallel with thin film planar, orientation is carried out to flattening soft-magnetic alloy powder, the solvent in removing batching simultaneously;
(4) film after flow casting molding is carried out hot-pressing processing under lower than waterborne polyurethane glass conversion temperature condition, obtain electromagnetic interference noise and suppress sheet material.
In this preparation method, by improving the ball-milling technology of raw material magnetic, the formula regulating material and moulding process, when making to select water-soluble glue to be binding agent, adopt casting technique successfully to prepare electromagnetic interference noise and suppress sheet, while guaranteeing sheet material safe preparation process, environmental protection, at utmost improve the electromagnetic performance of material.
As preferably, in step (1), ball in planetary ball mill: material: solvent: dispersant is 10: 1: 0.5: 0.02, rotating speed is 300rpm, Ball-milling Time is 250 minutes, adopt the forward and reverse alternately rotating technics ball milling after improving, within every 50 minutes, alternately once, obtain the flattening soft-magnetic alloy powder that draw ratio is 100: 1 ~ 200: 1.
As preferably, in step (2), flattening soft-magnetic alloy powder is from room temperature rises to 800 DEG C, and carry out oxygen-free environment annealing, annealing time is 16 hours.The electromagnetic performance of flattening soft-magnetic alloy powder is improved with this.
As preferably, in step (4), the pressure of hot-pressing processing is 15MPa, and the time of hot-pressing processing is 5 seconds.To improve the degree of orientation of flattening soft-magnetic alloy powder.
As preferably, the electromagnetic interference noise of preparation suppresses sheet material to detect under U=0.5V, N=20TS, T=25 DEG C of condition, and when 13.56MHz, complex permeability μ ' is 83.6 ~ 118.8, μ " is 34.6 ~ 59.1.
As preferably, the electromagnetic interference noise of preparation suppresses sheet material to occur maximum reflectivity when frequency is 4.28GHz place, and the electromagnetic interference noise of 0.1mm and 0.2mm thickness suppresses the maximum reflectivity of sheet material to reach-7.81dB and-9.25dB respectively.
The invention has the beneficial effects as follows: electromagnetic interference noise suppresses sheet material in preparation process, by improving the ball-milling technology of raw material magnetic, the formula regulating material and moulding process, when making to select water-soluble glue to be binding agent, adopt casting technique successfully to prepare electromagnetic interference noise and suppress sheet, while guaranteeing sheet material safe preparation process, environmental protection, at utmost improve the electromagnetic performance of material.
Accompanying drawing explanation
Fig. 1 is the echo attenuation ratio figure that in the present invention, electromagnetic interference noise suppresses sheet material.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
Embodiment 1:
Take appropriate iron nickel-molybdenum alloy powder (MPP) and add planetary ball mill, in ball: material: solvent: dispersant be 10: 1: 0.5: 0.02 ratio carry out batch mixing, be 300rpm at rotating speed, forward and reverse under 50 minutes alternately condition once ball milling 250 minutes, carry out the flaky process of powder, then anneal 16 hours in the tube furnace of 800 DEG C, obtain the preliminary treatment powder that draw ratio is 100: 1 ~ 200: 1.Then principal component 54.8wt%MPP, 28.7wt% absolute ethyl alcohol and 16.5wt% aqueous polyurethane Mix and dosing is taken, wherein: accessory ingredient comprises water in aqueous polyurethane and acetone, relative to principal component total weight, account for principal component total weight in the percentage by weight of its reference material water and acetone and be respectively 10.1wt% and 0.6wt%, the flow casting molding in PET film with scraper or spreader, while flattening MPP powder orientation, dry 1.5 hours removing absolute ethyl alcohols in 60 DEG C.After sheet drying, adopt vulcanizing press to carry out hot-pressing processing under the condition of the glass transition temperature 20 DEG C (namely 130 DEG C) lower than aqueous polyurethane, pressure is 15MPa, and the time is 5 seconds.Agilent 4291B analyzer is finally adopted to detect at U=0.5V, N=20TS, T=25 DEG C, the complex permeability μ ' of sheet material when 13.56MHz and μ ", result is as shown in table 1 below.The reflection loss coefficient of sheet material as shown in Figure 1, result shows that sheet material is that maximum reflectivity appears in 4.28GHz place in frequency, the maximum reflectivity of the sheet material of 0.1mm and 0.2mm thickness reaches-7.81dB and-9.25dB respectively, illustrates that this electromagnetic interference noise suppression sheet can usable reflection attenuates electromagnetic waves.
Table 1
Embodiment 2:
The ball-milling technology of flattening MPP powder is identical with embodiment 1 with annealing process, and just the principal component content of casting technique is different, and the content of MPP, absolute ethyl alcohol and aqueous polyurethane is respectively: 46.7wt%, 33.5wt% and 19.8wt%.The electromagnetic interference noise prepared suppresses the complex permeability μ ' of sheet material when 13.56MHz, and " result is as shown in table 2 below with μ.
Table 2
Embodiment 3:
The ball-milling technology of flattening MPP powder is identical with embodiment 1 with annealing process, and just the principal component content of casting technique is different, and the content of MPP, absolute ethyl alcohol and aqueous polyurethane is respectively: 40.0wt%, 34.0wt% and 26.0wt%.The electromagnetic interference noise prepared suppresses the complex permeability μ ' of sheet material when 13.56MHz, and " result is as shown in table 3 below with μ.
Table 3
Embodiment 4:
The annealing process of flattening MPP powder, the configuration of slurry and casting technique are identical with embodiment 1, and just the ball-milling technology of MPP powder is different, and planetary ball mill only single direction rotation carries out ball milling in 250 minutes.The electromagnetic interference noise prepared suppresses the complex permeability μ ' of sheet material when 13.56MHz, and " result is as shown in table 4 below with μ.
Table 4
Comparative example 1:
The ball-milling technology of flattening MPP powder and annealing process, and the content of principal component is identical with embodiment 1, just the kind of binding agent is different, and the content of MPP, absolute ethyl alcohol and acrylate polymer emulsion is respectively: 54.8wt%, 28.7wt% and 16.5wt%.The electromagnetic interference noise prepared suppresses the complex permeability μ ' of sheet material when 13.56MHz, and " result is as shown in table 5 below with μ.
Table 5
Comparative example 2:
The ball-milling technology of flattening MPP powder and annealing process, and the content of principal component is identical with embodiment 1, just the kind of binding agent is different, and the content of MPP, absolute ethyl alcohol and methylcellulose is respectively: 54.8wt%, 28.7wt% and 16.5wt%.The electromagnetic interference noise prepared suppresses the complex permeability μ ' of sheet material when 13.56MHz, and " result is as shown in table 6 below with μ.
Table 6
Comparative example 3:
The ball-milling technology of flattening MPP powder and annealing process, and the content of principal component is identical with embodiment 1, just the kind of binding agent is different, and the content of MPP, absolute ethyl alcohol and haloflex is respectively: 54.8wt%, 28.7wt% and 16.5wt%.The electromagnetic interference noise prepared suppresses the complex permeability μ ' of sheet material when 13.56MHz, and " result is as shown in table 7 below with μ.
Table 7
Comparative example 4:
The ball-milling technology of flattening MPP powder and annealing process, and the content of principal component is identical with embodiment 1, just the kind of binding agent is different, and the content of MPP, absolute ethyl alcohol and epoxy resin is respectively: 54.8wt%, 28.7wt% and 16.5wt%.The electromagnetic interference noise prepared suppresses the complex permeability μ ' of sheet material when 13.56MHz, and " result is as shown in table 8 below with μ.
Table 8
Comparative example 5:
The ball-milling technology of flattening MPP powder and annealing process, and the content of principal component is identical with embodiment 1, just the kind of binding agent is different, and the content of MPP, absolute ethyl alcohol and polyvinyl chloride is respectively: 54.8wt%, 28.7wt% and 16.5wt%.The electromagnetic interference noise prepared suppresses the complex permeability μ ' of sheet material when 13.56MHz, and " result is as shown in table 9 below with μ.
Table 9
By embodiment 1 gained compared with comparative example 1-5, at identical ball-milling technology and annealing process, and under the also identical condition of the content of principal component, just the kind of binding agent is different, when selecting this water-soluble glue of aqueous polyurethane to be binding agent, the complex permeability μ ' that the electromagnetic interference noise preparing gained suppresses sheet material when 13.56MHz and μ "; obviously than selecting water-insoluble glue to be the good of binding agent; while guaranteeing sheet material safe preparation process, environmental protection, at utmost improve the electromagnetic performance of sheet material.
Claims (9)
1. electromagnetic interference noise suppresses a sheet material, and it is characterized in that, comprise principal component and accessory ingredient, described principal component comprises iron nickel molybdenum, aqueous binders and absolute ethyl alcohol, and described aqueous binders is aqueous polyurethane; Described accessory ingredient comprises water in aqueous polyurethane and acetone.
2. a kind of electromagnetic interference noise according to claim 1 suppresses sheet material, and it is characterized in that, described principal component with respective mass percentage content is: iron nickel molybdenum is 40 ~ 60wt%, absolute ethyl alcohol is 20 ~ 40wt%, aqueous polyurethane is 10 ~ 26wt%.
3. a kind of electromagnetic interference noise according to claim 1 and 2 suppresses sheet material, it is characterized in that, described accessory ingredient, relative to described principal component total weight, accounts for principal component total weight in the percentage by weight of its reference material water and acetone and is respectively 7 ~ 12wt% and 0.4 ~ 0.8wt%.
4. electromagnetic interference noise suppresses a preparation method for sheet material, and it is characterized in that, concrete operation step is as follows:
(1) appropriate iron nickel molybdenum raw meal is added planetary ball mill mixing, adopt the forward and reverse alternately rotating technics ball milling after improving, obtain flattening soft-magnetic alloy powder;
(2) flattening soft-magnetic alloy powder is carried out oxygen-free environment annealing;
(3) adopt doctor blade method for tape-casting to make sheet film, then by the additional magnetic field parallel with thin film planar, orientation is carried out to flattening soft-magnetic alloy powder, the solvent in removing batching simultaneously;
(4) film after flow casting molding is carried out hot-pressing processing under lower than waterborne polyurethane glass conversion temperature condition, obtain electromagnetic interference noise and suppress sheet material.
5. a kind of electromagnetic interference noise according to claim 4 suppresses the preparation method of sheet material, it is characterized in that, in step (1), ball in planetary ball mill: material: solvent: dispersant is 10: 1: 0.5: 0.02, rotating speed is 300rpm, and Ball-milling Time is 250 minutes, adopts the forward and reverse alternately rotating technics ball milling after improving, within every 50 minutes, alternately once, obtain the flattening soft-magnetic alloy powder that draw ratio is 100: 1 ~ 200: 1.
6. a kind of electromagnetic interference noise according to claim 4 suppresses the preparation method of sheet material, it is characterized in that, in step (2), flattening soft-magnetic alloy powder is from room temperature rises to 800 DEG C, and carry out oxygen-free environment annealing, annealing time is 16 hours.
7. a kind of electromagnetic interference noise according to claim 4 suppresses the preparation method of sheet material, and it is characterized in that, in step (4), the pressure of hot-pressing processing is 15MPa, and the time of hot-pressing processing is 5 seconds.
8. a kind of electromagnetic interference noise according to claim 4 or 5 or 6 or 7 suppresses the preparation method of sheet material, it is characterized in that, the electromagnetic interference noise of preparation suppresses sheet material at U=0.5V, N=20TS, detect under T=25 DEG C of condition, when 13.56MHz, complex permeability μ ' is 83.6 ~ 118.8, μ " is 34.6 ~ 59.1.
9. a kind of electromagnetic interference noise according to claim 4 or 5 or 6 or 7 suppresses the preparation method of sheet material, it is characterized in that, the electromagnetic interference noise of preparation suppresses sheet material to occur maximum reflectivity when frequency is 4.28GHz place, and the electromagnetic interference noise of 0.1mm and 0.2mm thickness suppresses the maximum reflectivity of sheet material to reach-7.81dB and-9.25dB respectively.
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| CN107377960A (en) * | 2016-05-17 | 2017-11-24 | 株式会社理研 | Near field noise suppression sheet |
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| CN106571221A (en) * | 2016-11-15 | 2017-04-19 | 彭晓领 | Preparation method for anisotropic soft magnetic composite material |
| CN107415376A (en) * | 2017-07-31 | 2017-12-01 | 华中科技大学 | A kind of preparation method of electromagnetism anisotropy noise suppressed film and products thereof |
| CN107415376B (en) * | 2017-07-31 | 2019-08-20 | 华中科技大学 | A kind of preparation method and products thereof of electromagnetism anisotropy noise suppressed film |
| CN108597713A (en) * | 2018-06-11 | 2018-09-28 | 彭晓领 | A kind of preparation method of magnetic material |
| CN108987086A (en) * | 2018-06-14 | 2018-12-11 | 浙江工业大学 | Two-dimensional layered metal soft magnetic composite material and preparation method and application thereof |
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| CN111875949A (en) * | 2020-08-04 | 2020-11-03 | 苏州安洁新材料有限公司 | Preparation method of high-temperature-resistant hydrolysis-resistant wave-absorbing magnetic sheet |
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