CN110591262A - Rubber magnet and preparation method thereof - Google Patents
Rubber magnet and preparation method thereof Download PDFInfo
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- CN110591262A CN110591262A CN201810603123.2A CN201810603123A CN110591262A CN 110591262 A CN110591262 A CN 110591262A CN 201810603123 A CN201810603123 A CN 201810603123A CN 110591262 A CN110591262 A CN 110591262A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C08L33/04—Homopolymers or copolymers of esters
- C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
- C08L33/08—Homopolymers or copolymers of acrylic acid esters
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- 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
- H01F1/42—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of organic or organo-metallic materials, e.g. graphene
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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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- Polymers & Plastics (AREA)
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Abstract
The invention discloses a rubber magnet and a preparation method thereof, wherein the rubber magnet is prepared from the following raw materials in parts by weight: 70-90 parts of HDDR anisotropic neodymium iron boron magnetic powder, 3-5 parts of acrylate rubber, 2-4 parts of ethylene vinyl acetate rubber, 5-7 parts of plasticizer, 0.5-1 part of coupling agent, 0.2-0.4 part of thermal stabilizing additive, 3-5 parts of vulcanizing agent and 0.5-1 part of vulcanization accelerator. The invention has simple preparation process, and has higher magnet density and magnetic performance than the isotropic flexible bonded magnet prepared by the prior method, and the novel rubber magnet prepared by the method has the characteristics of strong flexibility, difficult breakage and the like because the rubber is used as the bonding agent, and the rubber magnet is processed by a die, is easy to form and can meet the requirements of magnet products with various sizes.
Description
Technical Field
The invention relates to the technical field of bonded permanent magnet materials, in particular to a rubber magnet and a preparation method thereof.
Background
Generally, there are two types of molding methods for rubber magnets: calendering and extrusion. The calendering method is a method in which a mixture obtained by kneading and pulverizing the above rubber, magnetic powder, processing aid, etc. is filled in a gap between two rollers which are turned in opposite directions, and the magnetic powder and the rubber, etc. are bonded together by continuous rolling and kneading to produce a magnetic sheet. The method is simplest, the manufactured magnetic sheet can be cut into required sizes at will, and the method is widely applied to the fields of magnetic strips of refrigerator door seals, small motors and the like. The extrusion molding method is a method in which a mixture obtained by kneading and pulverizing the rubber, magnetic powder, processing aid, and the like fed into an extruder is heated and melted, the mixture is extruded from a metal die of the extruder and cooled and solidified, and the obtained long molded article is cut into a desired length to produce a magnet. This method allows easy production of a thin and long magnet by selecting a metal mold and freely setting the shape of the magnet to some extent, and the requirement for the fluidity of the melt is not so high as that of injection molding.
In contrast, the rubber magnet produced by the calendering method is high in magnetic property, and therefore the calendering method is mainly used in the embodiment of the present invention. However, extrusion molding is particularly advantageous in terms of complicated shape, continuous production, and the like.
Ethylene-acrylate copolymers are thermoplastics or elastomers resulting from the copolymerization of ethylene and acrylates (methyl, ethyl, butyl, etc.). The ethylene-methyl acrylate copolymer is abbreviated as EMA, and the content of methyl acrylate is 8-40 percent. The ethylene-ethyl acrylate copolymer is called EEA for short, and the content of ethyl acrylate is 10-30%. Has good flexibility, thermal stability and processability. The environmental stress cracking resistance, the impact resistance, the bending fatigue resistance and the low temperature resistance are all superior to those of the low density polyethylene. Has good compatibility with polyolefins and can be mixed with a large amount of filler without becoming brittle. The product can be used as hot melt adhesive, composite film interlayer adhesive, sealing ring, packaging film, extrusion coating product, hose, sheet material section, wire and cable, resin modifier, toy, container, etc. Among them, ethylene-ethyl acrylate (EEA) resins are a family of polyolefins having the highest toughness and flexibility. They range from rubber-like, low melting products suitable for use as hot melt adhesives to polyethylene-like products having unusual toughness and flexibility.
The rubber magnet is a polymer matrix composite material, contains 30-40% of rubber matrix by volume fraction, and mainly comprises two types: one type is a CM-magnetic powder system, which is mainly prepared by CM (chlorinated polyethylene rubber), magnetic powder (permanent magnetic ferrite or bonded neodymium iron boron), additives (plasticizer, lubricant, coupling agent and anti-aging agent) through a rubber magnetic process, the rubber magnet is simple to process, does not need to be vulcanized and is low in price, but has the problems of containing halogen (the chlorine content reaches 7000ppm, is far higher than 900ppm, does not meet the severe environmental protection standard of Europe and America), the use temperature is below 80 ℃, the changeability of the rubber magnet exceeds 80 ℃, the dimensional accuracy is not high and the like; the other type is an NBR-magnetic powder system which is mainly prepared from NBR (nitrile butadiene rubber), magnetic powder (permanent magnetic ferrite or bonded neodymium iron boron), a vulcanizing agent and an auxiliary agent (a plasticizer, a lubricant, a coupling agent and an anti-aging agent) through a rubber magnetic process.
Disclosure of Invention
The present invention is directed to a rubber magnet and a method for manufacturing the same, which solve the problems of the background art mentioned above.
In order to achieve the purpose, the invention provides the following technical scheme:
a rubber magnet is composed of the following raw materials in parts by weight: 70-90 parts of HDDR anisotropic neodymium iron boron magnetic powder, 3-5 parts of acrylate rubber, 2-4 parts of ethylene vinyl acetate rubber, 5-7 parts of plasticizer, 0.5-1 part of coupling agent, 0.2-0.4 part of thermal stabilizing additive, 3-5 parts of vulcanizing agent and 0.5-1 part of vulcanization accelerator.
As a further scheme of the invention:
the rubber magnet is composed of the following raw materials in parts by weight: 75-85 parts of HDDR anisotropic neodymium iron boron magnetic powder, 3.5-4.5 parts of acrylate rubber, 2.5-3.5 parts of ethylene vinyl acetate rubber, 5.5-6.5 parts of plasticizer, 0.6-0.9 part of coupling agent, 0.25-0.35 part of heat stabilizing auxiliary agent, 3.5-4.5 parts of vulcanizing agent and 0.6-0.9 part of vulcanization accelerator.
As a further scheme of the invention:
the rubber magnet is composed of the following raw materials in parts by weight: 80 parts of HDDR anisotropic neodymium iron boron magnetic powder, 4 parts of acrylate rubber, 3 parts of ethylene vinyl acetate rubber, 6 parts of plasticizer, 0.8 part of coupling agent, 0.3 part of heat stabilizing auxiliary agent, 4 parts of vulcanizing agent and 0.8 part of vulcanization accelerator.
As a further scheme of the invention:
the plasticizer is one or more of fatty acid esters, epoxy esters, polyesters and trimellitates.
As a further scheme of the invention:
the flame retardant is one or more of expanded graphite, melamine cyanurate salt, magnesium hydroxide, aluminum hydroxide, phosphate ester, ammonium polyphosphate and pentaerythritol.
As a further scheme of the invention:
the thermal stability auxiliary agent is a mixture of metal soap and carbon black in any ratio.
As a further scheme of the invention:
the metal soap comprises one or more of calcium stearate, zinc stearate, magnesium stearate, calcium metasilicate and magnesium laurate.
As a further scheme of the invention:
the vulcanizing agent is sulfur, metal oxide, peroxide or amine vulcanizing agent.
As a still further scheme of the invention:
the vulcanization accelerator is thiazole, sulfenamide or thiuram.
The preparation method of the rubber magnet comprises the following specific steps:
(1) weighing the raw materials in parts by weight;
(2) uniformly stirring the HDDR anisotropic neodymium iron boron magnetic powder and the coupling agent in a high-speed mixer, taking out and drying for 5-7h to obtain coupled magnetic powder;
(3) placing acrylate rubber and ethylene vinyl acetate rubber on an open mill for mixing, controlling the open mill temperature to be 40-60 ℃, firstly adding the rubber, sequentially adding a plasticizer and a heat stabilizing auxiliary agent after the rubber material is uniformly coated on a roll, finally adding a vulcanizing agent and a vulcanization accelerator, uniformly mixing, and thinly passing for 4-6 times for sheet feeding;
(4) mixing the coupled magnetic powder with the rubber, then mixing in an internal mixer for 1.5-2h, controlling the internal mixing temperature at 70-90 ℃, crushing after the internal mixing is finished, and then producing sheets;
(5) preparing the rubber magnet through a calender or an extruder, wherein the heating is not needed during calendering and the extrusion temperature is 110-;
(6) after the rubber magnet is prepared, the rubber magnet passes through a continuous vulcanization furnace, the vulcanization temperature is 160-170 ℃, and the vulcanization time is 15-25 min;
(7) cutting and packaging to obtain the finished product.
Compared with the prior art, the invention has the beneficial effects that:
the invention has simple preparation process, and has higher magnet density and magnetic performance than the isotropic flexible bonded magnet prepared by the prior method, and the novel rubber magnet prepared by the method has the characteristics of strong flexibility, difficult breakage and the like because the rubber is used as the bonding agent, and the rubber magnet is processed by a die, is easy to form and can meet the requirements of magnet products with various sizes.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
Example 1
A rubber magnet is composed of the following raw materials in parts by weight: 70 parts of HDDR anisotropic neodymium iron boron magnetic powder, 3 parts of acrylate rubber, 2 parts of ethylene vinyl acetate rubber, 5 parts of plasticizer, 0.5 part of coupling agent, 0.2 part of heat stabilizing additive, 3 parts of vulcanizing agent and 0.5 part of vulcanization accelerator.
The preparation method of the rubber magnet comprises the following specific steps:
(1) weighing the raw materials in parts by weight;
(2) uniformly stirring the HDDR anisotropic neodymium iron boron magnetic powder and the coupling agent in a high-speed mixer, taking out and drying for 5 hours to obtain coupled magnetic powder;
(3) placing acrylate rubber and ethylene vinyl acetate rubber on an open mill for mixing, controlling the open mill temperature to be 40 ℃, adding the rubber, sequentially adding a plasticizer and a thermal stabilizing auxiliary agent after the rubber material is uniformly coated on a roll, finally adding a vulcanizing agent and a vulcanization accelerator, and performing thin passing for 4 times for sheet discharging after uniform mixing;
(4) mixing the coupled magnetic powder with the rubber, then mixing for 1.5h in an internal mixer, controlling the internal mixing temperature at 70 ℃, and crushing and sheet discharging after the internal mixing is finished;
(5) preparing the rubber magnet through a calender or an extruder, wherein the heating is not needed during calendering and the extrusion temperature is 110 ℃;
(6) after the rubber magnet is prepared, the rubber magnet passes through a continuous vulcanizing furnace, the vulcanizing temperature is 160 ℃, and the vulcanizing time is 15 min;
(7) cutting and packaging to obtain the finished product.
Example 2
A rubber magnet is composed of the following raw materials in parts by weight: 75 parts of HDDR anisotropic neodymium iron boron magnetic powder, 3.5 parts of acrylate rubber, 2.5 parts of ethylene vinyl acetate rubber, 5.5 parts of plasticizer, 0.6 part of coupling agent, 0.25 part of heat stabilizing auxiliary agent, 3.5 parts of vulcanizing agent and 0.6 part of vulcanization accelerator.
The preparation method of the rubber magnet comprises the following specific steps:
(1) weighing the raw materials in parts by weight;
(2) uniformly stirring the HDDR anisotropic neodymium iron boron magnetic powder and the coupling agent in a high-speed mixer, taking out and drying for 5.5 hours to obtain coupled magnetic powder;
(3) placing acrylate rubber and ethylene vinyl acetate rubber on an open mill for mixing, controlling the open mill temperature at 45 ℃, adding the rubber, sequentially adding a plasticizer and a heat stabilizing auxiliary agent after the rubber material is uniformly coated on a roll, finally adding a vulcanizing agent and a vulcanization accelerator, and performing thin passing for 4 times for sheet discharging after uniform mixing;
(4) mixing the coupled magnetic powder with the rubber, then mixing for 1.6h in an internal mixer, controlling the internal mixing temperature at 75 ℃, and crushing and sheet discharging after the internal mixing is finished;
(5) preparing the rubber magnet by a calender or an extruder, wherein the heating is not needed during calendering and the extrusion temperature is 115 ℃;
(6) after the rubber magnet is prepared, the rubber magnet passes through a continuous vulcanizing furnace, the vulcanizing temperature is 162 ℃, and the vulcanizing time is 18 min;
(7) cutting and packaging to obtain the finished product.
Example 3
A rubber magnet is composed of the following raw materials in parts by weight: 80 parts of HDDR anisotropic neodymium iron boron magnetic powder, 4 parts of acrylate rubber, 3 parts of ethylene vinyl acetate rubber, 6 parts of plasticizer, 0.8 part of coupling agent, 0.3 part of heat stabilizing auxiliary agent, 4 parts of vulcanizing agent and 0.8 part of vulcanization accelerator.
The preparation method of the rubber magnet comprises the following specific steps:
(1) weighing the raw materials in parts by weight;
(2) uniformly stirring the HDDR anisotropic neodymium iron boron magnetic powder and the coupling agent in a high-speed mixer, taking out and drying for 6 hours to obtain coupled magnetic powder;
(3) placing acrylate rubber and ethylene vinyl acetate rubber on an open mill for mixing, controlling the open mill temperature at 50 ℃, adding the rubber, sequentially adding a plasticizer and a heat stabilizing auxiliary agent after the rubber material is uniformly coated on a roll, finally adding a vulcanizing agent and a vulcanization accelerator, and performing thin passing for 5 times for sheet discharging after uniform mixing;
(4) mixing the coupled magnetic powder with the rubber, then mixing in an internal mixer for 1.8h, controlling the internal mixing temperature at 80 ℃, and crushing and sheet discharging after the internal mixing is finished;
(5) preparing the rubber magnet by a calender or an extruder, wherein the heating is not needed during calendering and the extrusion temperature is 120 ℃;
(6) after the rubber magnet is prepared, the rubber magnet passes through a continuous vulcanizing furnace, the vulcanizing temperature is 165 ℃, and the vulcanizing time is 20 min;
(7) cutting and packaging to obtain the finished product.
Example 4
A rubber magnet is composed of the following raw materials in parts by weight: 85 parts of HDDR anisotropic neodymium iron boron magnetic powder, 4.5 parts of acrylate rubber, 3.5 parts of ethylene vinyl acetate rubber, 6.5 parts of plasticizer, 0.9 part of coupling agent, 0.35 part of heat stabilizing auxiliary agent, 4.5 parts of vulcanizing agent and 0.9 part of vulcanization accelerator.
The preparation method of the rubber magnet comprises the following specific steps:
(1) weighing the raw materials in parts by weight;
(2) uniformly stirring the HDDR anisotropic neodymium iron boron magnetic powder and the coupling agent in a high-speed mixer, taking out and drying for 6.5 hours to obtain coupled magnetic powder;
(3) placing acrylate rubber and ethylene vinyl acetate rubber on an open mill for mixing, controlling the open mill temperature to be 55 ℃, firstly adding the rubber, sequentially adding a plasticizer and a heat stabilizing auxiliary agent after the rubber material is uniformly coated on a roll, finally adding a vulcanizing agent and a vulcanization accelerator, uniformly mixing, and thinly passing for 6 times for sheet discharging;
(4) mixing the coupled magnetic powder with the rubber, then mixing for 1.9h in an internal mixer, controlling the internal mixing temperature at 85 ℃, and crushing and sheet discharging after the internal mixing is finished;
(5) preparing the rubber magnet by a calender or an extruder, wherein the heating is not needed during calendering and the extrusion temperature is 125 ℃;
(6) after the rubber magnet is prepared, the rubber magnet passes through a continuous vulcanizing furnace, the vulcanizing temperature is 168 ℃, and the vulcanizing time is 22 min;
(7) cutting and packaging to obtain the finished product.
Example 5
A rubber magnet is composed of the following raw materials in parts by weight: 90 parts of HDDR anisotropic neodymium iron boron magnetic powder, 5 parts of acrylate rubber, 4 parts of ethylene vinyl acetate rubber, 7 parts of plasticizer, 1 part of coupling agent, 0.4 part of thermal stability auxiliary agent, 5 parts of vulcanizing agent and 1 part of vulcanization accelerator.
The preparation method of the rubber magnet comprises the following specific steps:
(1) weighing the raw materials in parts by weight;
(2) uniformly stirring the HDDR anisotropic neodymium iron boron magnetic powder and the coupling agent in a high-speed mixer, taking out and drying for 7 hours to obtain coupled magnetic powder;
(3) placing acrylate rubber and ethylene vinyl acetate rubber on an open mill for mixing, controlling the open mill temperature at 60 ℃, adding the rubber, sequentially adding a plasticizer and a thermal stabilizing auxiliary agent after the rubber material is uniformly coated on a roll, finally adding a vulcanizing agent and a vulcanization accelerator, and performing thin passing for 6 times for sheet discharging after uniform mixing;
(4) mixing the coupled magnetic powder with the rubber, then mixing for 2 hours in an internal mixer, controlling the internal mixing temperature at 90 ℃, and crushing and sheet discharging after the internal mixing is finished;
(5) preparing the rubber magnet through a calender or an extruder, wherein the heating is not needed during calendering and the extrusion temperature is 130 ℃;
(6) after the rubber magnet is prepared, the rubber magnet passes through a continuous vulcanizing furnace, the vulcanizing temperature is 170 ℃, and the vulcanizing time is 25 min;
(7) cutting and packaging to obtain the finished product.
The plasticizer is one or more of fatty acid esters, epoxy esters, polyesters and trimellitates. The flame retardant is one or more of expanded graphite, melamine cyanurate salt, magnesium hydroxide, aluminum hydroxide, phosphate ester, ammonium polyphosphate and pentaerythritol. The thermal stability auxiliary agent is a mixture of metal soap and carbon black in any ratio. The metal soap comprises one or more of calcium stearate, zinc stearate, magnesium stearate, calcium metasilicate and magnesium laurate. The vulcanizing agent is sulfur, metal oxide, peroxide or amine vulcanizing agent. The vulcanization accelerator is thiazole, sulfenamide or thiuram.
The invention has simple preparation process, and has higher magnet density and magnetic performance than the isotropic flexible bonded magnet prepared by the prior method, and the novel rubber magnet prepared by the method has the characteristics of strong flexibility, difficult breakage and the like because the rubber is used as the bonding agent, and the rubber magnet is processed by a die, is easy to form and can meet the requirements of magnet products with various sizes.
Although the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present patent within the knowledge of those skilled in the art.
Claims (10)
1. A rubber magnet is characterized by comprising the following raw materials in parts by weight: 70-90 parts of HDDR anisotropic neodymium iron boron magnetic powder, 3-5 parts of acrylate rubber, 2-4 parts of ethylene vinyl acetate rubber, 5-7 parts of plasticizer, 0.5-1 part of coupling agent, 0.2-0.4 part of thermal stabilizing additive, 3-5 parts of vulcanizing agent and 0.5-1 part of vulcanization accelerator.
2. The rubber magnet according to claim 1, characterized by consisting of the following raw materials in parts by weight: 75-85 parts of HDDR anisotropic neodymium iron boron magnetic powder, 3.5-4.5 parts of acrylate rubber, 2.5-3.5 parts of ethylene vinyl acetate rubber, 5.5-6.5 parts of plasticizer, 0.6-0.9 part of coupling agent, 0.25-0.35 part of heat stabilizing auxiliary agent, 3.5-4.5 parts of vulcanizing agent and 0.6-0.9 part of vulcanization accelerator.
3. The rubber magnet according to claim 1, characterized by consisting of the following raw materials in parts by weight: 80 parts of HDDR anisotropic neodymium iron boron magnetic powder, 4 parts of acrylate rubber, 3 parts of ethylene vinyl acetate rubber, 6 parts of plasticizer, 0.8 part of coupling agent, 0.3 part of heat stabilizing auxiliary agent, 4 parts of vulcanizing agent and 0.8 part of vulcanization accelerator.
4. A rubber magnet as defined in any one of claims 1 to 3, wherein said plasticizer is one or more of fatty acid esters, epoxy esters, polyesters and trimellitates.
5. A rubber magnet as defined in any one of claims 1 to 3, wherein said flame retardant is one or more of expanded graphite, melamine cyanurate, magnesium hydroxide, aluminum hydroxide, phosphate ester, ammonium polyphosphate, pentaerythritol.
6. A rubber magnet in accordance with any one of claims 1 to 3, wherein said heat-stabilizing auxiliary agent is a mixture of a metal soap and carbon black in any ratio.
7. A rubber magnet according to any one of claims 1 to 3, wherein said metal soap comprises one or more of calcium stearate, zinc stearate, magnesium stearate, calcium laurate and magnesium laurate.
8. A rubber magnet according to any one of claims 1 to 3, wherein said vulcanizing agent is sulfur, a metal oxide, a peroxide or an amine vulcanizing agent.
9. A rubber magnet according to any one of claims 1 to 3, wherein said vulcanization accelerator is a thiazole, a sulfenamide or a thiuram.
10. A method for producing a rubber magnet according to any one of claims 1 to 3, characterized by comprising the steps of:
(1) weighing the raw materials in parts by weight;
(2) uniformly stirring the HDDR anisotropic neodymium iron boron magnetic powder and the coupling agent in a high-speed mixer, taking out and drying for 5-7h to obtain coupled magnetic powder;
(3) placing acrylate rubber and ethylene vinyl acetate rubber on an open mill for mixing, controlling the open mill temperature to be 40-60 ℃, firstly adding the rubber, sequentially adding a plasticizer and a heat stabilizing auxiliary agent after the rubber material is uniformly coated on a roll, finally adding a vulcanizing agent and a vulcanization accelerator, uniformly mixing, and thinly passing for 4-6 times for sheet feeding;
(4) mixing the coupled magnetic powder with the rubber, then mixing in an internal mixer for 1.5-2h, controlling the internal mixing temperature at 70-90 ℃, crushing after the internal mixing is finished, and then producing sheets;
(5) preparing the rubber magnet through a calender or an extruder, wherein the heating is not needed during calendering and the extrusion temperature is 110-;
(6) after the rubber magnet is prepared, the rubber magnet passes through a continuous vulcanization furnace, the vulcanization temperature is 160-170 ℃, and the vulcanization time is 15-25 min;
(7) cutting and packaging to obtain the finished product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810603123.2A CN110591262A (en) | 2018-06-12 | 2018-06-12 | Rubber magnet and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810603123.2A CN110591262A (en) | 2018-06-12 | 2018-06-12 | Rubber magnet and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112331473A (en) * | 2020-11-23 | 2021-02-05 | 横店集团东磁股份有限公司 | Trapezoidal rubber-plastic extruded neodymium-iron-boron magnetic strip and preparation method thereof |
| CN115472370A (en) * | 2022-09-20 | 2022-12-13 | 北京大学 | Flexible permanent magnetic material, preparation method and application thereof in magnetic biological effect product |
| CN117275864A (en) * | 2023-10-08 | 2023-12-22 | 江苏普隆磁电有限公司 | Preparation method and application of high-performance neodymium-iron-boron magnet |
-
2018
- 2018-06-12 CN CN201810603123.2A patent/CN110591262A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112331473A (en) * | 2020-11-23 | 2021-02-05 | 横店集团东磁股份有限公司 | Trapezoidal rubber-plastic extruded neodymium-iron-boron magnetic strip and preparation method thereof |
| CN112331473B (en) * | 2020-11-23 | 2022-06-17 | 横店集团东磁股份有限公司 | Trapezoidal rubber-plastic extruded neodymium-iron-boron magnetic strip and preparation method thereof |
| CN115472370A (en) * | 2022-09-20 | 2022-12-13 | 北京大学 | Flexible permanent magnetic material, preparation method and application thereof in magnetic biological effect product |
| CN117275864A (en) * | 2023-10-08 | 2023-12-22 | 江苏普隆磁电有限公司 | Preparation method and application of high-performance neodymium-iron-boron magnet |
| CN117275864B (en) * | 2023-10-08 | 2024-05-03 | 江苏普隆磁电有限公司 | Preparation method and application of high-performance neodymium-iron-boron magnet |
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Application publication date: 20191220 |