CN104616854B - 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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- CN104616854B CN104616854B CN201410852297.4A CN201410852297A CN104616854B CN 104616854 B CN104616854 B CN 104616854B CN 201410852297 A CN201410852297 A CN 201410852297A CN 104616854 B CN104616854 B CN 104616854B
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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 belonging to magnetically soft alloy material correlative technology field, refer in particular to a kind of electromagnetic interference noise suppression piece
Material and preparation method thereof.
Background technology
With improving of national economy and becoming stronger day by day of China's science and technology, meet the need of people's electronic equipment update
Ask, miscellaneous electronic product is also increasingly liked by broad masses, electronic equipment is towards miniaturization, integrated and high
The trend development of frequencyization, the electromagnetic compatibility problem of thing followed high-frequency range is also serious all the more.Electromagnetic interference noise suppresses
Piece relies on that it is flexible, ultra-thin, applying frequency wide ranges, easy cutting, attachment are convenient, secondary radiation is widely closed the features such as little
Note.
It is that a kind of absorbent with absorbing property is thin with what macromolecular material was composited that electromagnetic interference noise suppresses piece
Sheet-like article.Because the magnetic-field component of near field electromagnetic ripple is big, mainly based on magnetic loss, wave absorbing agent is generally magnetic material for loss
Material.Such noise suppression sheet can directly be covered in noise generating source, such as on cpu, ic, pcb and fpc circuit, both can be significantly
Eliminate the radiated noise producing when they work, also extraneous interference signal can be kept apart.Additionally, noise suppression sheet also may be used
The electromagnetic induction coupling that with effective crosstalk reducing between circuit, reduces associated electronic circuitry, reduce electromagnetic radiation, attenuating RF circuit
Interference etc..For example, using in the noncontact ic label of rfid technology, made an uproar by adding electromagnetic interference between label and metallic plate
Sound suppresses piece, can be prevented effectively from alternating electromagnetic field and be subject to metal swirl attenuation, thus increasing reading/writing distance；In wireless charging skill
Art field, can be prevented effectively from charger because of electronics vortex generation Kelvin effect by increasing noise suppression sheet, give simultaneously and hand over
Sense magnetic field offer loop, thus effectively improve charge efficiency.Well imagine, with the application of this product, electromagnetic interference is made an uproar
Acquisition is widely applied space by sound suppression piece.
At present, electromagnetic interference noise suppression piece mainly adopts epoxy resin, chlorinated polyethylene, polrvinyl chloride, polyamide, gathers
The water-insoluble organic material such as vinyl alcohol is used as binding agent, mostly needs using more organic solvent and plasticizer or solidification
Agent, has certain pollution to environment.Have the shortcomings that sheet material pcrmeability is low simultaneously.
Content of the invention
The present invention is to overcome non-aqueous organic material in electromagnetic interference noise suppression sheet material preparation process in prior art
Material has undesirable effect to environment and the low shortcoming of sheet material pcrmeability as binding agent, there is provided a kind of raising pcrmeability and peace
Electromagnetic interference noise suppression sheet material that loopful is protected and preparation method thereof.
To achieve these goals, the present invention employs the following technical solutions:
A kind of electromagnetic interference noise suppresses sheet material, and including main constituent and accessory ingredient, described main constituent includes ferrum nickel molybdenum, water
Property binding agent and dehydrated alcohol, described aqueous binders are aqueous polyurethane；Described accessory ingredient is included in aqueous polyurethane
Water and acetone.
In the present invention, it is being the feelings of binding agent from this water-soluble glue of aqueous polyurethane that electromagnetic interference noise suppresses sheet material
It is ensured that while electromagnetic interference noise suppresses sheet material safe preparation process, environmental protection, at utmost improving the electro permanent magnetic of material under condition
Energy.
Preferably, described main constituent with respective mass percentage content is: ferrum nickel molybdenum is 40～60wt%, anhydrous
Ethanol is 20～40wt%, aqueous polyurethane is 10～26wt%.
Preferably, described accessory ingredient is with respect to described main constituent gross weight, in terms of its reference material water and acetone
Percentage by weight accounts for main constituent gross weight and is respectively 7～12wt% and 0.4～0.8wt%.
Suppress sheet material for above-mentioned electromagnetic interference noise, present invention also offers a kind of electromagnetic interference noise suppresses sheet material
Preparation method, concrete operation step is as follows:
(1) appropriate ferrum nickel molybdenum raw material powder is added planetary ball mill mixing, using the forward and reverse alternately rotation after improving
Skill of changing a job ball milling, obtains flattening soft-magnetic alloy powder；
(2) flattening soft-magnetic alloy powder is carried out oxygen-free environment annealing；
(3) sheet film is made using doctor blade method for tape-casting, then pass through the additional magnetic field parallel with thin film planar to flat
Change soft-magnetic alloy powder to be orientated, remove the solvent in dispensing simultaneously；
(4) thin film after flow casting molding is carried out at hot pressing under the conditions of less than waterborne polyurethane glass conversion temperature
Reason, obtains electromagnetic interference noise suppression sheet material.
In this preparation method, by improving the ball-milling technology of raw material magnetic powder, adjust the formula of material and moulding process so that
From water-soluble glue for binding agent in the case of, electromagnetic interference noise suppression piece is successfully prepared it is ensured that piece using casting technique
While material safe preparation process, environmental protection, at utmost improve the electromagnetic performance of material.
Preferably, 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, is alternately rotated technique ball milling using forward and reverse after improving, every 50 points
Clock alternately once, obtains the flattening soft-magnetic alloy powder that draw ratio is 100: 1～200: 1.
Preferably, in step (2), flattening soft-magnetic alloy powder rises to 800 DEG C from room temperature, carry out oxygen-free environment and move back
Fire, annealing time is 16 hours.The electromagnetic performance of flattening soft-magnetic alloy powder is improved with this.
Preferably, in step (4), the pressure of hot-pressing processing is 15mpa, the time of hot-pressing processing is 5 seconds.To carry
The degree of orientation of high flattening soft-magnetic alloy powder.
Preferably, the electromagnetic interference noise suppression sheet material of preparation, in u=0.5v, is examined under the conditions of n=20ts, t=25 DEG C
Survey, in 13.56mhz, complex permeability μ ' is 83.6～118.8, μ " is 34.6～59.1.
Preferably, the electromagnetic interference noise suppression sheet material of preparation is maximum reflectivity when at 4.28ghz in frequency,
The electromagnetic interference noise of 0.1mm and 0.2mm thickness suppresses the maximum reflectivity of sheet material to respectively reach -7.81db and -9.25db.
The invention has the beneficial effects as follows: electromagnetic interference noise suppresses sheet material in preparation process, by improving raw material magnetic powder
Ball-milling technology, adjust the formula of material and moulding process so that being binding agent from water-soluble glue in the case of, using curtain coating
Technique successfully prepares electromagnetic interference noise suppression piece it is ensured that while sheet material safe preparation process, environmental protection, at utmost improving
The electromagnetic performance of material.
Brief description
Fig. 1 is the echo attenuation ratio figure that in the present invention, electromagnetic interference noise suppresses sheet material.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and detailed description.
Embodiment 1:
Weigh appropriate ferrum nickel-molybdenum alloy powder (mpp) and add planetary ball mill, by ball: material: solvent: dispersant is 10: 1
: 0.5: 0.02 ratio carries out batch mixing, is 300rpm in rotating speed, forward and reverse every 50 minutes alternately once under conditions of ball milling
250 minutes, carry out the flaky process of powder, then anneal 16 hours in 800 DEG C of tube furnace, obtaining draw ratio is 100:
1～200: 1 pretreatment powder.Then main constituent 54.8wt%mpp, 28.7wt% dehydrated alcohol and 16.5wt% aqueouss are weighed
Polyurethane Mix and dosing, wherein: accessory ingredient includes water and acetone in aqueous polyurethane, with respect to main constituent gross weight, with it
The percentage by weight of reference material water and acetone meter accounts for main constituent gross weight and is respectively 10.1wt% and 0.6wt%, with scraper or painting
Cloth device flow casting molding on pet thin film, while flattening mpp powder is orientated, removes anhydrous second in 1.5 hours in 60 DEG C of drying
Alcohol.After sheet drying, using vulcanizing press the glass transition temperature less than aqueous polyurethane 20 DEG C (i.e. 130 DEG C) bar
Carry out hot-pressing processing, pressure is 15mpa, the time is 5 seconds under part.Finally adopt agilent 4291b analyser in u=0.5v, n
Detect at=20ts, t=25 DEG C, the complex permeability μ ' in 13.56mhz for the sheet material and μ ", result is as shown in table 1 below.Sheet material
Reflection loss coefficient as shown in figure 1, result shows that sheet material maximum reflectivity at frequency is for 4.28ghz, 0.1mm and
The maximum reflectivity of the sheet material of 0.2mm thickness respectively reaches -7.81db and -9.25db, and this electromagnetic interference noise suppression piece is described
Can effective reflection loss electromagnetic wave.
Table 1
Embodiment 2:
The ball-milling technology of flattening mpp powder is same as Example 1 with annealing process, and the simply main constituent of casting technique contains
Amount is different, and the content of mpp, dehydrated alcohol and aqueous polyurethane is respectively as follows: 46.7wt%, 33.5wt% and 19.8wt%.Preparation
Electromagnetic interference noise suppression the complex permeability μ ' in 13.56mhz for the sheet material " result is as shown in table 2 below with μ.
Table 2
Embodiment 3:
The ball-milling technology of flattening mpp powder is same as Example 1 with annealing process, and the simply main constituent of casting technique contains
Amount is different, and the content of mpp, dehydrated alcohol and aqueous polyurethane is respectively as follows: 40.0wt%, 34.0wt% and 26.0wt%.Preparation
Electromagnetic interference noise suppression the complex permeability μ ' in 13.56mhz for the sheet material " 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 same as Example 1, simply mpp powder
The ball-milling technology at end is different, and planetary ball mill only single direction rotation carries out ball milling in 250 minutes.The electromagnetic interference noise suppression of preparation
" result is as shown in table 4 below with μ for the complex permeability μ ' in 13.56mhz for the sheet material.
Table 4
Comparative example 1:
The ball-milling technology of flattening mpp powder and annealing process, and the content of main constituent is same as Example 1, simply
The species of binding agent is different, and the content of mpp, dehydrated alcohol and acrylate polymer emulsion is respectively as follows: 54.8wt%, 28.7wt%
And 16.5wt%.The electromagnetic interference noise suppression complex permeability μ ' in 13.56mhz for the sheet material of preparation and μ " result such as following table
Shown in 5.
Table 5
Comparative example 2:
The ball-milling technology of flattening mpp powder and annealing process, and the content of main constituent is same as Example 1, simply
The species of binding agent is different, the content of mpp, dehydrated alcohol and methylcellulose be respectively as follows: 54.8wt%, 28.7wt% and
16.5wt%.The electromagnetic interference noise suppression complex permeability μ ' in 13.56mhz for the sheet material of preparation and μ " result such as table 6 below
Shown.
Table 6
Comparative example 3:
The ball-milling technology of flattening mpp powder and annealing process, and the content of main constituent is same as Example 1, simply
The species of binding agent is different, the content of mpp, dehydrated alcohol and chlorinated polyethylene be respectively as follows: 54.8wt%, 28.7wt% and
16.5wt%.The electromagnetic interference noise suppression complex permeability μ ' in 13.56mhz for the sheet material of preparation and μ " result such as table 7 below
Shown.
Table 7
Comparative example 4:
The ball-milling technology of flattening mpp powder and annealing process, and the content of main constituent is same as Example 1, simply
The species of binding agent is different, the content of mpp, dehydrated alcohol and epoxy resin be respectively as follows: 54.8wt%, 28.7wt% and
16.5wt%.The electromagnetic interference noise suppression complex permeability μ ' in 13.56mhz for the sheet material of preparation and μ " result such as table 8 below
Shown.
Table 8
Comparative example 5:
The ball-milling technology of flattening mpp powder and annealing process, and the content of main constituent is same as Example 1, simply
The species of binding agent is different, the content of mpp, dehydrated alcohol and polrvinyl chloride be respectively as follows: 54.8wt%, 28.7wt% and
16.5wt%.The electromagnetic interference noise suppression complex permeability μ ' in 13.56mhz for the sheet material of preparation and μ " result such as table 9 below
Shown.
Table 9
By embodiment 1 compared with comparative example 1-5 gained, in identical ball-milling technology and annealing process, and main constituent
Content also under the conditions of identical, simply the species of binding agent is different, is being bonding from this water-soluble glue of aqueous polyurethane
In the case of agent, prepare the electromagnetic interference noise suppression complex permeability μ ' in 13.56mhz for the sheet material and μ of gained " hence it is evident that
Than from water-insoluble glue for binding agent will be well it is ensured that while sheet material safe preparation process, environmental protection, at utmost improving piece
The electromagnetic performance of material.
Claims (8)
1. a kind of electromagnetic interference noise suppresses sheet material, it is characterized in that, including main constituent and accessory ingredient, described main constituent includes ferrum
Nickel molybdenum, aqueous binders and dehydrated alcohol, described aqueous binders are aqueous polyurethane；Described accessory ingredient includes aqueouss and gathers
Water in urethane and acetone, described main constituent with respective mass percentage content is: ferrum nickel molybdenum is 40～60wt%, anhydrous
Ethanol is 20～40wt%, aqueous polyurethane is 10～26wt%.
2. a kind of electromagnetic interference noise according to claim 1 suppresses sheet material, it is characterized in that, described accessory ingredient with respect to
Described main constituent gross weight, the percentage by weight in terms of its reference material water and acetone account for main constituent gross weight be respectively 7～
12wt% and 0.4～o.8wt%.
3. a kind of electromagnetic interference noise suppresses the preparation method of sheet material, it is characterized in that, concrete operation step is as follows:
(1) appropriate ferrum nickel molybdenum raw material powder is added planetary ball mill mixing, work is alternately rotated using forward and reverse after improving
Skill ball milling, obtains flattening soft-magnetic alloy powder；
(2) flattening soft-magnetic alloy powder is carried out oxygen-free environment annealing；
(3) sheet film is made using doctor blade method for tape-casting, then soft to flattening by the additional magnetic field parallel with thin film planar
Magnetic alloy powder is orientated, and removes the solvent in dispensing simultaneously；
(4) thin film after flow casting molding is carried out hot-pressing processing under the conditions of less than waterborne polyurethane glass conversion temperature, obtain
Suppress sheet material to electromagnetic interference noise.
4. a kind of electromagnetic interference noise according to claim 3 suppresses the preparation method of sheet material, it is characterized in that, in step
(1) in, ball in planetary ball mill: material: solvent: dispersant is 10: 1: 0.5: 0.02, rotating speed is 300rpm, Ball-milling Time
For 250 minutes, technique ball milling is alternately rotated using forward and reverse after improving, every 50 minutes alternately once, and obtaining draw ratio is 100
: 1～200: 1 flattening soft-magnetic alloy powder.
5. a kind of electromagnetic interference noise according to claim 3 suppresses the preparation method of sheet material, it is characterized in that, in step
(2) in, flattening soft-magnetic alloy powder rises to 800 DEG C from room temperature, carries out oxygen-free environment annealing, and annealing time is 16 hours.
6. a kind of electromagnetic interference noise according to claim 3 suppresses the preparation method of sheet material, it is characterized in that, in step
(4) in, the pressure of hot-pressing processing is 15mpa, and the time of hot-pressing processing is 5 seconds.
7. a kind of electromagnetic interference noise according to claim 3 or 4 or 5 or 6 suppresses the preparation method of sheet material, its feature
It is that the electromagnetic interference noise suppression sheet material of preparation, in u=0.5v, detects under the conditions of n=20ts, t=25 DEG C, in 13.56mhz
When, complex permeability μ ' is 83.6～118.8, μ " is 34.6～59.1.
8. a kind of electromagnetic interference noise according to claim 3 or 4 or 5 or 6 suppresses the preparation method of sheet material, its feature
It is that the electromagnetic interference noise suppression sheet material of preparation is maximum reflectivity when at 4.28ghz in frequency, 0.1mm and 0.2mm is thick
The electromagnetic interference noise of degree suppresses the maximum reflectivity of sheet material to respectively reach -7.81db and -9.25db.
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| CN105482213B (en) * | 2016-01-15 | 2017-11-03 | 横店集团东磁股份有限公司 | A kind of halogen-free flame-retardant noise suppression piece and preparation method thereof |
| CN105826069B (en) * | 2016-05-07 | 2019-04-09 | 江苏金羿先磁新材料科技有限公司 | A kind of preparation method of nanoscale primitive assembling compounded magnetic conductive thin-film material |
| JP6280157B2 (en) * | 2016-05-17 | 2018-02-14 | 株式会社リケン | Near-field noise suppression sheet |
| JP6612676B2 (en) * | 2016-05-17 | 2019-11-27 | 株式会社リケン | Near-field noise suppression sheet |
| CN107507689B (en) * | 2016-06-14 | 2019-08-13 | 有研稀土新材料股份有限公司 | The preparation method of high magnetic permeability absorbing material |
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| 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 |
| CN108597713B (en) * | 2018-06-11 | 2020-09-25 | 中国计量大学 | Preparation method of magnetic material |
| CN108987086B (en) * | 2018-06-14 | 2020-10-02 | 浙江工业大学 | Two-dimensional layered metal soft magnetic composite material and preparation method and application thereof |
| CN110060834B (en) * | 2019-05-16 | 2021-06-08 | 常州威斯双联科技有限公司 | Soft magnetic alloy powder, wave absorbing plate, preparation method of soft magnetic alloy powder, electronic component and electronic equipment |
| 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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