CN105482196B - A kind of calendering process for improving noise suppression piece magnetic conductivity - Google Patents
A kind of calendering process for improving noise suppression piece magnetic conductivity Download PDFInfo
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- CN105482196B CN105482196B CN201610028248.8A CN201610028248A CN105482196B CN 105482196 B CN105482196 B CN 105482196B CN 201610028248 A CN201610028248 A CN 201610028248A CN 105482196 B CN105482196 B CN 105482196B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
- B29C43/24—Calendering
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
-
- 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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K2003/023—Silicon
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0812—Aluminium
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0856—Iron
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/01—Magnetic additives
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Medicinal Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Power Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Hard Magnetic Materials (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Soft Magnetic Materials (AREA)
Abstract
The invention discloses a kind of calendering process for improving noise suppression piece magnetic conductivity, comprise the following steps：(1), by mass percentage：Binding agent 4%~14%, magnetic 85%~95% is filled, remaining is auxiliary material, solvent complete wetting filling magnetic, is then well mixed；(2) mixture in step (1), is taken to be put into drying in baking oven, drying temperature is 60 DEG C~120 DEG C, and the time is 0.5~2 hour；(3), take step (2) to dry complete mixture, be put into compression molding in warmed-up calender；(4), after compression molding, noise suppression piece is subjected to vulcanizing treatment, finally obtained noise suppression piece.Noise suppression piece prepared by the present invention, manufacturing process is simple, manufacturing cost is cheap, it is effective contained that the pattern of magnetic and microstructure are destroyed during mixing in noise suppression piece, and then the features such as improve the magnetic conductivity of noise suppression piece.
Description
Technical field
The invention belongs to composite manufacturing field, and in particular to a kind of calendering side for improving noise suppression piece magnetic conductivity
Method.
Background technology
Noise suppression piece is that one kind has electromagnetism interference (EMI) function, can solve the problem that electronic product electromagnetic compatibility (EMC)
The sheet type material of problem, it is widely used in the integrated of electronic product (such as mobile phone, notebook computer, GPS navigator)
The components such as circuit module, CPU, Anneta module.In recent years, with the miniaturization of electronic product, Highgrade integration, high frequency,
EMI and EMC problems are more and more prominent, be badly in need of developing the noise suppression piece of higher performance with tackle increasingly severe EMI and
EMC problems.
Noise suppression piece is generally combined by high polymer binder and sheet magnetic, and main preparation method has curtain coating work
Skill and calendering technology.The former can prepare the sample of high magnetic permeability, but complex process, and low production efficiency, cost is high, limits significantly
Its application；The features such as the latter is easily controllable because technique is simple, and equipment requirement is relatively low, and production efficiency is high and largely adopted
With.However, noise suppression piece magnetic conductivity prepared by calendering technology is generally relatively low, this is inherently lacked mainly due to traditional calendering technology
Fall into and caused by.Traditional calendering technology flow is substantially as shown in Figure 3：
Solid-state polymer binding agent and sheet magnetic are weighed by design proportion first, while adds the (vulcanization of appropriate auxiliary material
Agent, coupling agent etc.).Then load weighted raw material is added in banbury and mill and be fully kneaded.When magnetic and auxiliary
After material is well mixed with high polymer binder, mixture is put into calender and is molded slice, by regulating and controlling calendar rolls away from next
Adjust the thickness of noise suppression piece.Finally noise suppression piece is vulcanized.
It is pointed out that auxiliary material (vulcanizing agent, coupling agent etc.) addition is seldom, final products magnetic conductivity is influenceed very
It is small.Meanwhile vulcanization only has an impact to physical property such as mechanical property, hardness etc. of noise suppression piece, and magnetic conductivity is not influenceed.
In the case where magnetic composition and its packing ratio are fixed, the magnetic conductivity of noise suppression the piece mainly pattern by magnetic and microcosmic knot
Structure, and its influence of arrangement in a binder.Because binding agent is solid-state, viscosity is larger, during mixing, magnetic by
To very big stress, and then occur to crush, shape anisotropy is destroyed, while magnetic internal stress dramatically increases, it is impossible to
Ordered arrangement in binding agent, low magnetic conductivity is ultimately resulted in.
Magnetic conductivity is a Key Performance Indicator for influenceing noise suppression piece, but traditional calendering technology limits noise suppression
The raising of film-making magnetic conductivity, therefore, it is badly in need of finding a kind of method for improving noise suppression piece magnetic conductivity prepared by calendering technology.
The content of the invention
The invention provides a kind of manufacturing process is simple, manufacturing cost is cheap, effective has contained magnetic in noise suppression piece
Pattern and microstructure be destroyed during mixing, and then improve the calendering process of the magnetic conductivity of noise suppression piece.
The purpose of the present invention is achieved through the following technical solutions：A kind of calendering process for improving noise suppression piece magnetic conductivity,
Comprise the following steps：
(1), from low viscosity liquid macroimolecule material as binding agent, from the liquid macroimolecule matched with binding agent
Material is solvent, from sheet magnetically soft alloy magnetic as magnetic is filled, by mass percentage：Binding agent 4%~14%, is filled out
Magnetize powder 85%~95%, and remaining is auxiliary material, solvent complete wetting filling magnetic, is then well mixed；
(2), taking in step (1) mixture to be put into baking oven to dry, drying temperature is 60 DEG C~120 DEG C, the time is 0.5~
2 hours；
(3), take step (2) to dry complete mixture, be put into compression molding in warmed-up calender；
(4), after compression molding, noise suppression piece is subjected to vulcanizing treatment, finally obtained noise suppression piece.
Preferably, auxiliary material includes one or more of vulcanizing agent, coupling agent in the step (1).
Preferably, binding agent is liquid nitrile rubber, fluid silicone rubber, liquid natural rubber or poly- in the step (1)
One kind in urethane.
Preferably, solvent requirement can uniformly dilute binding agent and auxiliary material, including toluene, acetic acid second in the step (1)
Ester, ethanol or acetone.
Preferably, sheet magnetically soft alloy magnetic requires excellent soft magnet performance in the step (1) and high footpath is thick
Than (ratio of sheet magnetic radial dimension and thickness), wherein material saturation magnetization need to be more than 100emu/g, and magnetic footpath is thick
Than 40 need to be more than:1, including Fe-Si-Al, Fe-Si, Fe-Si-Cr, Fe-Ni-Mo or Fe-Ni.
Preferably, vulcanizing agent includes peroxide or quinones in the step (1)；Coupling agent includes silane coupled
Agent or titanate coupling agent.
Preferably, calender possesses heating and refrigerating function in the step (3), and temperature is 40 DEG C~70 DEG C.
Preferably, curing temperature and time, curing temperature was depending on selected binding agent in the step (4)
120 DEG C~170 DEG C, cure time is 0.1 hour~1 hour.
The present invention is had the following advantages relative to prior art and effect：
The magnetic that the present invention selects is the sheet magnetic with good soft magnet performance and high radius-thickness ratio, and this is advantageous to noise suppression
Film-making improves natural resonant frequency while high magnetic permeability is obtained, and breaches the limitation of the Snoke limit to a certain extent, right
The use frequency range for widening noise suppression piece is significant.Suitable liquid adhesive is matched simultaneously, utilizes stirring+drying
Technique instead of traditional rubber mixing-milling technique, effectively contain that the pattern of magnetic and microstructure are being kneaded in noise suppression piece
It is destroyed during (banburying and mill), while magnetic will not produce internal stress, this causes the magnetic after being kneaded still to keep
Excellent soft magnet performance and high radius-thickness ratio, by optimizing the ratio of magnetic and binding agent, coordinate appropriate calendering technology, most
The magnetic conductivity of noise suppression piece is caused to obtain obvious raising eventually.In addition, by technique improved sheet magnetic with
The interfacial bonding property of binding agent so that mobility of the magnetic with binder mixtures in calender line strengthens, and finally causes institute
The noise suppression piece outward appearance of preparation is more smooth, more smooth.In addition, using the rubber mixing-milling technique of traditional banburying+mill,
The packing ratio of sheet magnetic is limited, generally below the 92% of gross mass, and the packing ratio of magnetic is too high, the magnetic of noise suppression piece
Conductance will not improve, and can conversely decrease；And pass through process modification, the packing ratio of magnetic can reach the 95% of gross mass, and
And magnetic conductivity has a certain upgrade.
Brief description of the drawings
Fig. 1 is the permeability curcve comparison diagram of embodiment 3 and comparative example 1 in the present invention；
Fig. 2 is the permeability curcve comparison diagram of embodiment 4 and comparative example 2 in the present invention；
Fig. 3 is calendering technology flow chart in the prior art.
Embodiment
With reference to embodiment, the present invention is described in further detail, but the implementation of the present invention is not limited to this.
Embodiment 1
A kind of calendering process for improving noise suppression piece magnetic conductivity, comprises the following steps：
(1), from low viscosity liquid macroimolecule material as binding agent, from the liquid macroimolecule matched with binding agent
Material is solvent, from sheet magnetically soft alloy magnetic as magnetic is filled, by mass percentage：Binding agent 4.3%, fill magnetic
Powder 95%, solvent complete wetting filling magnetic, is then well mixed；
(2) mixture in step (1), is taken to be put into drying in baking oven, drying temperature is 100 DEG C, and the time is 1 hour；
(3), take step (2) to dry complete mixture, be put into compression molding in warmed-up calender；
(4), after compression molding, noise suppression piece is subjected to vulcanizing treatment, finally obtained noise suppression piece.
Auxiliary material is vulcanizing agent in step described in the present embodiment (1), and vulcanizing agent selects peroxide, and mass percent is
0.7%.
Binding agent is liquid nitrile rubber in step (1) in the present embodiment；Solvent requirement can uniformly dilute in step (1)
Binding agent and auxiliary material, the present embodiment are toluene；Sheet magnetically soft alloy magnetic requires high soft magnet performance and height in step (1)
Radius-thickness ratio (ratio of sheet magnetic radial dimension and thickness), the present embodiment uses Fe-Si-Al, average aspect ratio 50:1.
Calender possesses heating and refrigerating function in step (3) in the present embodiment, and temperature is 40 DEG C；Vulcanize in step (4)
For temperature and time depending on selected binding agent, curing temperature is 120 DEG C, and cure time is 0.1 hour.
Embodiment 2
A kind of calendering process for improving noise suppression piece magnetic conductivity, comprises the following steps：
(1), from low viscosity liquid macroimolecule material as binding agent, from the liquid macroimolecule matched with binding agent
Material is solvent, from sheet magnetically soft alloy magnetic as magnetic is filled, by mass percentage：Binding agent 14%, fill magnetic
Powder 85%, solvent complete wetting filling magnetic, is then well mixed；
(2) mixture in step (1), is taken to be put into drying in baking oven, drying temperature is 70 DEG C, and the time is 0.5 hour；
(3), take step (2) to dry complete mixture, be put into compression molding in warmed-up calender；
(4), after compression molding, noise suppression piece is subjected to vulcanizing treatment, finally obtained noise suppression piece.
Also include auxiliary material in the present embodiment in step (1), auxiliary material is the mixture of vulcanizing agent and coupling agent, and vulcanizing agent is quinone
Class compound, coupling agent are titanate coupling agent, wherein vulcanizing agent 0.6%, coupling agent 0.4%, and gross mass percentage is 1%.
Binding agent is fluid silicone rubber in step (1) in the present embodiment；Solvent requirement can uniformly dilute viscous in step (1)
It is ethyl acetate to tie agent and auxiliary material, the present embodiment；In step (1) sheet magnetically soft alloy magnetic require high soft magnet performance and
High radius-thickness ratio (ratio of sheet magnetic radial dimension and thickness), the present embodiment Fe-Si-Cr, average aspect ratio 40:1.
Calender possesses heating and refrigerating function in step (3) in the present embodiment, and temperature is 70 DEG C；Vulcanize in step (4)
For temperature and time depending on selected binding agent, curing temperature is 170 DEG C, and cure time is 1 hour.
Embodiment 3
The present embodiment difference from Example 1 is：Respectively from oiliness polyurethane (liquid), sheet Fe-Si-Al powder
With ethyl acetate as binding agent, soft-magnetic alloy powder and solvent, the mass ratio of three is 10:1:2.Three is put into irony cylinder
In shape vessel, it is stirred using electric blender, mixture is put into baking oven after stirring and dried.Oven temperature is 60
DEG C, dry 30 minutes, solvent (ethyl acetate) volatilizees completely.Mixture after drying is put on calender and goes out sheetmolding, is pressed
Prolong temperature as 55 DEG C, regulation calendar rolls are away from being made 0.4mm thickness noise suppression pieces.Noise suppression piece is put into baking oven and carried out
Vulcanization, curing temperature are 130 DEG C, and cure time is 30 minutes.Noise suppression piece is finally punched into internal diameter 8.5mm, external diameter
14mm annulus, is tested for magnetic conductivity, and the present embodiment does not include auxiliary material.
Embodiment 4
The present embodiment difference from Example 2 is：Respectively from liquid nitrile rubber, sheet Fe-Si-Al powder, first
Benzene and it is used as binding agent, soft-magnetic alloy powder, solvent and vulcanizing agent with cumyl peroxide (DCP).Four kinds of materials are according to as follows
Ratio weighs, binding agent：Magnetic：Solvent：Vulcanizing agent=9:1:2:0.0625.Four kinds of materials are successively put into irony cylindrical vessel
In ware, it is stirred using electric blender, mixture is put into baking oven after stirring and dried.Oven temperature is 95 DEG C,
Drying 30 minutes, solvent (toluene) volatilize completely.Mixture after drying is put into rolling out film in calender, rolling temperature is
50 DEG C, regulation calendar rolls are away from being made 0.4mm thickness noise suppression pieces.Thin slice is put into baking oven and vulcanized, curing temperature is
150 DEG C, cure time is 40 minutes.Noise suppression piece is finally punched into internal diameter 8.5mm, external diameter 14mm annulus, for magnetic
Conductance is tested.
Comparative example 1
Glued respectively from polyurethane elastomer (solid-state) and sheet Fe-Si-Al powder as binding agent and magnetically soft alloy magnetic
The mass ratio for tying agent and magnetic is 10:1.Binding agent and magnetic are put into progress banburying mixing, mixing temperature 70 in banbury
DEG C, mixture is put into mill progress mill mixing after 30 minutes, mill temperature is 50 DEG C, again will after mill 5 times
Mixture is put into banbury and crushed, and the compound particles particle diameter after crushing is in 1mm -5mm；Compound particles are being pressed
Prolong and roll on machine, temperature is 55 DEG C, regulates and controls the roll spacing of calender, 0.4mm thin slices are made；Thin slice is put into baking oven and carries out sulphur
Change, curing temperature is 130 DEG C, and cure time is 30 minutes.Noise suppression piece is finally punched into internal diameter 8.5mm, external diameter 14mm
Annulus, for magnetic conductivity test.
As shown in figure 1, magnetic conductivity survey is carried out to noise suppression piece prepared in embodiment 3 and comparative example 1 respectively
Examination, test equipment is Agilent E4991A.As seen from the figure, magnetic of the noise suppression piece in embodiment 3 and comparison example 1 in 2MHz
Conductance is respectively 41 and 25.By improving calendering technology, magnetic conductivity improves about 64%.
Comparative example 2
Respectively from nitrile rubber (solid-state), sheet Fe-Si-Al powder, cumyl peroxide (DCP) and titanate esters coupling
Agent is as binding agent, magnetically soft alloy magnetic, vulcanizing agent and coupling agent.Four kinds of materials weigh according to following ratio, binding agent：Magnetic
Powder：Vulcanizing agent：Coupling agent=9:1:0.0625:0.025.Binding agent, magnetic, vulcanizing agent, coupling agent are successively put into banbury
Middle progress banburying mixing, mixing temperature are 80 DEG C, and mixture is put into mill and carries out mill mixing by banburying after 30 minutes, opens
Mill temperature is 50 DEG C, and mixture is put into banbury again after mill 5 times and crushed, it is broken after compound particles particle diameter exist
1mm—5mm；By compound particles, compression molding, temperature are 50 DEG C on calender, adjust the roll spacing of calender, 0.4mm is made
Thin slice；Thin slice is put into baking oven and vulcanized, curing temperature is 150 DEG C, and cure time is 40 minutes.Finally by noise suppression
Piece is punched into internal diameter 8.5mm, external diameter 14mm annulus, is tested for magnetic conductivity.
As shown in Fig. 2 magnetic conductivity survey is carried out to noise suppression piece prepared in embodiment 4 and comparative example 2 respectively
Examination, test equipment is Agilent E4991A.As seen from the figure, magnetic of the noise suppression piece in embodiment 4 and comparison example 2 in 2MHz
Conductance is respectively 43 and 33.By improving calendering technology, magnetic conductivity improves about 30%.
Above-described embodiment is the preferable embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any Spirit Essences without departing from the present invention with made under principle change, modification, replacement, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (7)
1. a kind of calendering process for improving noise suppression piece magnetic conductivity, it is characterised in that comprise the following steps：
(1), from low viscosity liquid macroimolecule material as binding agent, be molten from the liquid material matched with binding agent
Agent, from sheet magnetically soft alloy magnetic as magnetic is filled, by mass percentage：Binding agent 4%~14%, fill magnetic
85%~95%, remaining is auxiliary material, solvent complete wetting filling magnetic, is then well mixed；
(2) mixture in step (1), is taken to be put into drying in baking oven, drying temperature is 60 DEG C~120 DEG C, and the time is 0.5~2 small
When；
(3), take step (2) to dry complete mixture, be put into compression molding in warmed-up calender；
(4), after compression molding, noise suppression piece is subjected to vulcanizing treatment, finally obtained noise suppression piece；
The solvent requirement can uniformly dilute binding agent and auxiliary material, including toluene, ethyl acetate, ethanol or acetone.
2. the calendering process according to claim 1 for improving noise suppression piece magnetic conductivity, it is characterised in that：The step
(1) auxiliary material includes one or more of vulcanizing agent, coupling agent in.
3. the calendering process according to claim 2 for improving noise suppression piece magnetic conductivity, it is characterised in that：The binding agent
For one kind in liquid nitrile rubber, fluid silicone rubber, liquid natural rubber or polyurethane.
4. the calendering process according to claim 2 for improving noise suppression piece magnetic conductivity, it is characterised in that：The sheet is soft
Magnetic alloy magnetic requires high radius-thickness ratio, and sheet magnetically soft alloy magnetic saturation magnetization need to be more than 100emu/g, magnetic
Radius-thickness ratio need to be more than 40:1, including Fe-Si-Al, Fe-Si, Fe-Si-Cr, Fe-Ni-Mo or Fe-Ni.
5. the calendering process according to claim 2 for improving noise suppression piece magnetic conductivity, it is characterised in that：The step
(1) vulcanizing agent includes peroxide or quinones in；Coupling agent includes silane coupler or titanate coupling agent.
6. the calendering process according to claim 2 for improving noise suppression piece magnetic conductivity, it is characterised in that：The step
(3) calender possesses heating and refrigerating function in, and temperature is 40 DEG C~70 DEG C.
7. the calendering process according to claim 2 for improving noise suppression piece magnetic conductivity, it is characterised in that：The step
(4) curing temperature and time, curing temperature was 120 DEG C~170 DEG C depending on selected binding agent in, and cure time is
0.1 hour~1 hour.
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Families Citing this family (7)
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| CN106188690A (en) * | 2016-07-12 | 2016-12-07 | 横店集团东磁股份有限公司 | A kind of electromagnetic noise suppression sheet and preparation method thereof |
| CN106009111A (en) * | 2016-07-12 | 2016-10-12 | 横店集团东磁股份有限公司 | Composite shielding material and preparation method thereof |
| CN107880798A (en) * | 2017-11-29 | 2018-04-06 | 横店集团东磁股份有限公司 | A kind of heat conduction wave absorbing patch and preparation method thereof |
| CN107841125B (en) * | 2017-11-29 | 2019-12-10 | 横店集团东磁股份有限公司 | Preparation method of high-performance noise suppression sheet |
| CN110669266A (en) * | 2019-10-23 | 2020-01-10 | 江门江益磁材有限公司 | High-temperature-resistant high-permeability wave-absorbing sheet and preparation method thereof |
| CN111048299B (en) * | 2020-01-07 | 2022-06-07 | 广州金南磁性材料有限公司 | Bonded magnet and preparation method thereof |
| CN112563011A (en) * | 2020-11-10 | 2021-03-26 | 广州金南磁性材料有限公司 | Flexible neodymium-iron-boron magnet and preparation method and application thereof |
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| JP5108859B2 (en) * | 2009-11-16 | 2012-12-26 | 藤倉ゴム工業株式会社 | Manufacturing method of noise suppression sheet |
| JP5455258B2 (en) * | 2012-02-21 | 2014-03-26 | Ｎｅｃトーキン株式会社 | Noise suppression sheet |
| CN102964774A (en) * | 2012-10-16 | 2013-03-13 | 横店集团东磁股份有限公司 | Manufacturing method of soft magnetic alloy composite material |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: A Rolling Method for Improving the Magnetic Permeability of Noise Suppression Sheets Effective date of registration: 20230522 Granted publication date: 20171212 Pledgee: Dongyang Branch of China Construction Bank Co.,Ltd. Pledgor: HENGDIAN GROUP DMEGC MAGNETICS Co.,Ltd. Registration number: Y2023330000949 |