CN107266060B - Magnetic separation sheet for NFC and preparation method thereof - Google Patents
Magnetic separation sheet for NFC and preparation method thereof Download PDFInfo
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- CN107266060B CN107266060B CN201710439840.1A CN201710439840A CN107266060B CN 107266060 B CN107266060 B CN 107266060B CN 201710439840 A CN201710439840 A CN 201710439840A CN 107266060 B CN107266060 B CN 107266060B
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- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 238000007885 magnetic separation Methods 0.000 title claims abstract description 9
- 239000000843 powder Substances 0.000 claims abstract description 25
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 23
- 239000011230 binding agent Substances 0.000 claims abstract description 12
- 239000003960 organic solvent Substances 0.000 claims abstract description 12
- 229920002635 polyurethane Polymers 0.000 claims abstract description 11
- 239000004814 polyurethane Substances 0.000 claims abstract description 11
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000002270 dispersing agent Substances 0.000 claims abstract description 6
- 239000004014 plasticizer Substances 0.000 claims abstract description 6
- 238000000498 ball milling Methods 0.000 claims description 22
- 238000005266 casting Methods 0.000 claims description 11
- 239000002002 slurry Substances 0.000 claims description 11
- KOMIMHZRQFFCOR-UHFFFAOYSA-N [Ni].[Cu].[Zn] Chemical group [Ni].[Cu].[Zn] KOMIMHZRQFFCOR-UHFFFAOYSA-N 0.000 claims description 10
- 229910001308 Zinc ferrite Inorganic materials 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 5
- 239000002518 antifoaming agent Substances 0.000 claims description 4
- 239000006148 magnetic separator Substances 0.000 claims description 4
- 230000005389 magnetism Effects 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 3
- 239000010962 carbon steel Substances 0.000 claims description 3
- 239000012467 final product Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 229910052726 zirconium Inorganic materials 0.000 claims description 3
- 239000002904 solvent Substances 0.000 abstract description 8
- 239000002861 polymer material Substances 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 2
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 abstract description 2
- 150000002576 ketones Chemical class 0.000 abstract description 2
- 238000004891 communication Methods 0.000 description 4
- 235000019441 ethanol Nutrition 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 150000001298 alcohols Chemical class 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000010345 tape casting Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 229910001053 Nickel-zinc ferrite Inorganic materials 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000012776 electronic material Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 238000004626 scanning electron microscopy Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
- C04B35/265—Compositions containing one or more ferrites of the group comprising manganese or zinc and one or more ferrites of the group comprising nickel, copper or cobalt
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/26—Producing shaped prefabricated articles from the material by slip-casting, i.e. by casting a suspension or dispersion of the material in a liquid-absorbent or porous mould, the liquid being allowed to soak into or pass through the walls of the mould; Moulds therefor ; specially for manufacturing articles starting from a ceramic slip; Moulds therefor
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
- C04B35/2666—Other ferrites containing nickel, copper or cobalt
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/62605—Treating the starting powders individually or as mixtures
- C04B35/6261—Milling
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/62605—Treating the starting powders individually or as mixtures
- C04B35/62625—Wet mixtures
- C04B35/6264—Mixing media, e.g. organic solvents
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/632—Organic additives
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/632—Organic additives
- C04B35/634—Polymers
- C04B35/63448—Polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B35/63456—Polyurethanes; Polyisocyanates
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
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- Engineering & Computer Science (AREA)
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- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Power Engineering (AREA)
- Dispersion Chemistry (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Soft Magnetic Materials (AREA)
- Magnetic Ceramics (AREA)
- Paints Or Removers (AREA)
Abstract
The invention discloses a magnetic separation sheet for NFC, which comprises the following components in parts by weight: 100 parts of ferrite powder; 3-15 parts of a binder; 1-5 parts of a plasticizer; 30-120 parts of an organic solvent; 0.1-2.5 parts of a dispersing agent; the organic solvent is one or more than one of alcohol solvent, ester solvent and ketone, and the binder is polyurethane polymer material. The invention also discloses a preparation method of the magnetic separation sheet for NFC. The invention has the characteristics of relatively low preparation cost and environmental protection.
Description
Technical Field
The invention belongs to the technical field of electronic material manufacturing, and particularly relates to a magnetic separation sheet for NFC and a preparation method thereof.
Background
In recent years, with the vigorous development of the electronic communication industry, the Near Field Communication (NFC) technology is continuously improved and expanded, and the NFC module has become the factory standard configuration of the mobile phone in some developed countries. The NFC mobile phone is internally provided with an NFC chip, the NFC chip is suitable for electronic currency payment by using the function of data bidirectional transmission, and the technology can support various applications including mobile payment and transaction, peer-to-peer communication, information access in mobile and the like. NFC devices are used as contactless smart cards, reader terminals for smart cards, and device-to-device data transmission links. Because the NFC antenna sets up and can produce the eddy current phenomenon near cell-phone circuit board or battery, leads to signal strength to weaken, paste the ferrite piece between NFC antenna and cell-phone battery so that with signal and metal isolation, reduce the interference of eddy current, reach the purpose that improves communication distance. Modern electronic products are being developed to be light and thin, and the requirements on the thickness and performance of ferrite plates are also increasing.
Currently, ferrite sheets for NFC are generally prepared by using nickel copper zinc as a main powder raw material and adopting a casting process. Compared with an extrusion or pressing molding mode, the ferrite film formed by tape casting has the advantages of low compactness, serious powder sedimentation, uneven density, sintering warpage and low yield.
Disclosure of Invention
The invention provides the magnetic separator sheet for NFC, which is relatively low in preparation cost and more environment-friendly, and aims to solve the problems of single production formula, sintering warpage, high organic solvent toxicity, high cost and difficult sheet filming in the prior art.
The invention also aims to provide a preparation method of the magnetic separation sheet for NFC.
The purpose of the invention is realized by the following technical scheme: a magnetic separation sheet for NFC comprises the following components in parts by weight:
the organic solvent is one or more than one of alcohol solvent, ester solvent and ketone, and the binder is polyurethane polymer material.
The ferrite powder is nickel-copper-zinc ferrite powder.
The average particle size of the nickel-copper-zinc ferrite powder is 2.0-3.0 microns.
The binder is waterborne polyurethane.
The organic solvent is absolute ethyl alcohol.
The thickness of the magnetism isolating sheet is below 0.25 mm.
The preparation method of the magnetic shielding sheet for NFC comprises the following steps:
1) adding 100 parts by weight of ferrite powder into a ball milling tank, adding 30-120 parts by weight of organic solvent, adding 0.1-2.5 parts by weight of dispersant, and carrying out ball milling for 1-5 hours to fully wet and uniformly disperse the ferrite powder in the organic solvent;
2) then adding 3-15 parts by weight of a binder with a solid content of 30% and 1-5 parts by weight of a plasticizer, and adding 0-1 part by weight of a defoaming agent, wherein the ball milling speed is 200rpm, and the ball milling time is 5-12 hours;
3) taking out the slurry, filtering by using a screen, and defoaming in vacuum for 15min to obtain slurry for NFC casting;
4) and casting to obtain the final product.
The ferrite powder is nickel-copper-zinc ferrite powder; the average particle size of the nickel-copper-zinc ferrite powder is 2.0-3.0 microns; the binder is waterborne polyurethane; the thickness of the magnetism isolating sheet is below 0.25 mm.
The ball milling medium in the step 1) is one or more of steel balls, carbon steel balls and zirconium balls.
Compared with the prior art, the invention has the following advantages and effects:
the invention adopts alcohols as solvent, meets the requirement of environmental protection and reduces the production cost at the same time. According to the invention, polyurethane polymer materials are used as the adhesive, the casting speed in the casting process is changed, the compactness of the ferrite sheet is improved, the casting effect is better than that of the traditional polyvinyl butyral adhesive, the dried ferrite sheet is easier to strip from the release film, and the volatilization rate of the solvent is accelerated without a high-temperature heating mode. Meanwhile, the method disclosed by the invention is more suitable for ultrathin ferrite plates, and the thickness is preferably less than 0.25 mm. In the mixing process of the ferrite powder and the waterborne polyurethane, absolute ethyl alcohol can be used as a single solvent to carry out pulping treatment on the ferrite powder. The preparation method of the slurry can reduce the usage amount of the solvent, accelerate the volatilization rate of water in the water-based polyurethane, improve the flexibility of the ferrite green sheet, reduce the damage degree of the green sheet and improve the sintering flatness of the ferrite sheet.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
Example 1
A magnetic separation sheet for NFC comprises the following components in parts by weight:
in this embodiment, the organic solvent is absolute ethyl alcohol, and the binder is a polyurethane polymer material.
The ferrite powder in this embodiment is nickel-copper-zinc ferrite powder; the average particle size of the nickel-copper-zinc ferrite powder is 2.0-3.0 microns; the binder is waterborne polyurethane; the thickness of the magnetism isolating sheet is below 0.25 mm.
The preparation method of the magnetic shielding sheet for NFC comprises the following steps:
1) adding 100 parts by weight of ferrite powder into a ball milling tank, adding 20-120 parts by weight of organic solvent, adding 0.1-2.5 parts by weight of dispersant, and performing ball milling for 0.5-5 hours to fully wet and uniformly disperse the ferrite powder in the organic solvent;
2) then adding 3-15 parts by weight of a binder with a solid content of 30% and 1-5 parts by weight of a plasticizer, and adding 0-1 part by weight of a defoaming agent, wherein the ball milling speed is 200rpm, and the ball milling time is 5-12 hours;
3) taking out the slurry, filtering by using a screen, and defoaming in vacuum for 15min to obtain slurry for NFC casting;
4) and casting to obtain the final product.
The ball milling medium in the step 1) is one or more of steel balls, carbon steel balls and zirconium balls.
Example 2
Weighing the following raw materials: 100 parts by weight of nickel-zinc ferrite powder (the average particle size of particles is 2.0-3.0 microns), 15-60 parts by weight of alcohol and benzene solvents serving as organic solvents and 0.1-2.5 parts by weight of dispersing agent are added into a ball milling tank and ball milled for 0.5-5 h; then adding 3-15 parts by weight of binder and 1-5 parts by weight of plasticizer, and carrying out ball milling for 5-12h at the ball milling rotation speed of 200 rpm; and filtering the ball-milled slurry to obtain a ball-milling medium, and performing vacuum defoaming for 15min to obtain casting slurry L1.
Example 3
Weighing the following raw materials: 100 parts by weight of nickel-copper-zinc ferrite powder (the average particle size of particles is 2.0-3.0 microns), 30-120 parts by weight of alcohols serving as a solvent and 0.1-2.5 parts by weight of a dispersing agent are added into a ball milling tank and ball milled for 0.5-5 hours; and then adding 3-15 parts by weight of polyurethane polymer material with the solid content of 30% and 1-5 parts by weight of plasticizer, adding 0-1 part by weight of defoaming agent, carrying out ball milling at the ball milling rotation speed of 200rpm for 5-12h, taking out slurry, filtering by using a screen, and carrying out vacuum defoaming for 15min to obtain slurry L2 for NFC tape casting.
The permeability of the magnetic sheets was measured under 100mV using an Agilent E4991A analyzer, and the results of the performance measurements are shown in Table 1. It can be seen from table 1 that the L1 performance test results are lower than that of L2.
TABLE 1 permeability of examples 2 and 3 magnetic sheets
SEM analysis of example 2 and example 3 shows that the ferrite green sheet prepared by the method of example 3 has a larger density and less pores, and the relative performance is improved by about 10%.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (3)
1. A preparation method of a magnetic separation sheet for NFC is characterized by comprising the following steps:
1) adding 100 parts by weight of ferrite powder into a ball milling tank, adding 30-120 parts by weight of absolute ethyl alcohol, adding 0.1-2.5 parts by weight of a dispersing agent, and carrying out ball milling for 0.5-5 hours to fully wet and uniformly disperse the ferrite powder in an organic solvent;
2) then adding 3-15 parts by weight of a binder with a solid content of 30% and 1-5 parts by weight of a plasticizer, and adding 0-1 part by weight of a defoaming agent, wherein the ball milling speed is 200rpm, and the ball milling time is 5-12 hours;
3) taking out the slurry, filtering by using a screen, and defoaming in vacuum for 15min to obtain slurry for NFC casting;
4) casting to obtain the final product;
the ferrite powder is nickel-copper-zinc ferrite powder; the average particle size of the nickel-copper-zinc ferrite powder is 2.0-3.0 microns; the binder is waterborne polyurethane; the thickness of the magnetism isolating sheet is below 0.25 mm.
2. The method for producing a magnetic separator sheet for NFC according to claim 1, comprising the steps of: the ball milling medium in the step 1) is one or more of steel balls, carbon steel balls and zirconium balls.
3. A magnetic separator sheet for NFC according to claim 1, obtained by the process for producing a magnetic separator sheet for NFC according to claim 1.
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| CN201710439840.1A CN107266060B (en) | 2017-06-12 | 2017-06-12 | Magnetic separation sheet for NFC and preparation method thereof |
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| CN108053008B (en) * | 2017-11-29 | 2020-03-24 | 横店集团东磁股份有限公司 | Magnetic shielding sheet for high-frequency RFID electronic tag and preparation method thereof |
| CN109910163A (en) * | 2017-12-13 | 2019-06-21 | 昊佰电子科技（上海）有限公司 | A kind of ferrite bound edge part manufacture craft |
| CN108774056B (en) * | 2018-06-14 | 2021-04-20 | 横店集团东磁股份有限公司 | NiZn ferrite magnetic sheet and preparation method and application thereof |
| CN108911729A (en) * | 2018-06-28 | 2018-11-30 | 宁波高新区兆丰微晶新材料有限公司 | Ni-Zn-Cu system complex ferrite piece and preparation method thereof |
| CN109608183A (en) * | 2018-12-27 | 2019-04-12 | 横店集团东磁股份有限公司 | A kind of preparation method of ultra-thin ferrite sheet |
| CN109650870B (en) * | 2019-01-24 | 2021-07-16 | 横店集团东磁股份有限公司 | Slurry of flake ferrite material and preparation method and application thereof |
| WO2020155077A1 (en) * | 2019-02-01 | 2020-08-06 | 江苏金羿先磁新材料科技有限公司 | Magnetic-resistance plate having fragrance, and preparation method and application thereof |
| CN110511039A (en) * | 2019-09-18 | 2019-11-29 | 横店集团东磁股份有限公司 | A kind of magnetic sheet and preparation method thereof |
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| KR101447533B1 (en) * | 2013-02-27 | 2014-10-06 | 에스케이씨 주식회사 | Flexible ceramic component |
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| CN105541314A (en) * | 2014-11-04 | 2016-05-04 | 深圳振华富电子有限公司 | Preparation method of ferrite sheets |
| CN105537581A (en) * | 2016-01-11 | 2016-05-04 | 横店集团东磁股份有限公司 | Noise suppression piece and preparation method thereof |
| CN106158232A (en) * | 2016-08-12 | 2016-11-23 | 广州市晶磁电子科技有限公司 | Digitizing plate antifreeze plate and manufacture method thereof |
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| CN107266060A (en) | 2017-10-20 |
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Application publication date: 20171020 Assignee: Jinhua cimeng Intellectual Property Service Co.,Ltd. Assignor: HENGDIAN GROUP DMEGC MAGNETICS Co.,Ltd. Contract record no.: X2023330000883 Denomination of invention: A magnetic separator for NFC and its preparation method Granted publication date: 20200707 License type: Common License Record date: 20231128 |