CN102723165A - Bonded NdFeB (neodymium, ferrum and boron) strong magnet and preparation method thereof - Google Patents
Bonded NdFeB (neodymium, ferrum and boron) strong magnet and preparation method thereof Download PDFInfo
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- CN102723165A CN102723165A CN2012101826749A CN201210182674A CN102723165A CN 102723165 A CN102723165 A CN 102723165A CN 2012101826749 A CN2012101826749 A CN 2012101826749A CN 201210182674 A CN201210182674 A CN 201210182674A CN 102723165 A CN102723165 A CN 102723165A
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Abstract
The invention provides a bonded NdFeB (neodymium, ferrum and boron) magnet. The magnet comprises the following raw materials in percentage by weight: 80-95 percent of NdFeB powder, 0-20 percent of ferrite rubber magnetic powder, 0-20 percent of rubber, 0-20 percent of functional plastic, and the balance of assistant. The invention further provides a preparation method of the bonded NdFeB strong magnet. With the adoption of the bonded NdFeB strong magnet and the preparation method thereof, the produced product is soft, small in brittleness, high and stable in magnetic property, easy to be assembled, and various specifications and dimensions can be easily formed, and meanwhile, the preparation cost is low, the efficiency is high, the energy is saved the consumption is reduced; and moreover, the magnet and the method are environment-friendly and halogen-free, and are pollution-free for the environment.
Description
Technical field
The present invention relates to a kind of magnet and preparation method thereof, relate in particular to a kind of Agglutinate neodymium-iron-boron strong magnet and preparation method thereof.
Background technology
Magnetic synthetic material (product) is the nearly 2 years a kind of novel high polymer functional materials that grow up, and is one of the important foundation material (product) in modern science and technology field.The magnetic synthetic material is divided into structural type and compound two kinds.Wherein, compound magnetic synthetic material is divided into two big types, thermoplasticity and thermosetting.The thermoplastic magnetic synthetic material can be divided into two types according to processing method, and one type for being base material with haloflex or acrylonitrile-butadiene rubber etc., adopts the magnetic rubber of the processing technology moulding of rubber; Another kind of is injection (extruding) magnet of base material with nylon, polyphenylene sulfide.
The neodymium iron boron strong magnet is undoubtedly the outstanding person in the magnetic synthetic material (product).Neodium magnet (Neodymium magnet) is also referred to as ndfeb magnet, is the general designation of strong magnets, and its chemical formula is Nd2Fe14B, is a kind of artificial permanent magnet, for extremely having the permanent magnet of magnetic force the most by force so far.The advantage of neodymium iron boron is that cost performance is high, has the favorable mechanical characteristic, and weak point is that Curie point is low; Temperature characterisitic is poor; And be easy to the efflorescence corrosion, must just can reach requirement of actual application through adjusting its chemical composition and taking surface treatment method to make it to be able to improve.The core technology of ndfeb magnet industry is mainly reflected on the manufacturing process, is embodied in the aspect such as uniformity, consistency, crudy, quality of coating of its product.According to its manufacturing process, ndfeb magnet can be divided into two kinds of Agglutinate neodymium-iron-boron and sintered NdFeBs.In fact bonding is exactly injection mo(u)lding, and sintering is to vacuumize through the heat moulding.But adopt these two kinds of methods to prepare ndfeb magnet, manufacturing cost is high, and not its shape of malleable, and preparation material is prone to cause environmental pollution.In view of this, how to reduce production costs, enhance productivity, the product easy-formation of preparation, energy-saving and cost-reducing simultaneously, reducing environmental pollution is a problem demanding prompt solution.
Summary of the invention
To the defective that exists in Agglutinate neodymium-iron-boron magnet of the prior art and preparation method thereof, the present invention provides a kind of Agglutinate neodymium-iron-boron strong magnet and preparation method thereof.
The object of the present invention is to provide a kind of Agglutinate neodymium-iron-boron strong magnet, raw material comprises that percentage by weight is 80～95% cohesive neodymium iron boron magnetic particle, 0～20% ferrite rubber magnetic powder, and 0～20% rubber, 0～20% functional plastic, surplus is an auxiliary agent.
Preferably, the auxiliary agent of Agglutinate neodymium-iron-boron strong magnet comprises zinc stearate, stearic acid; Magnesia, heterocyclic age resistor, oxidation inhibitor; Epoxy resin; And other additive, to calculate by weight, the ratio of each composition is 0.05～4: 0.05～2 in the auxiliary agent: 0.05～2: 1～1.8: 1～2: 1～20: 1～3;
Preferably, other additive of Agglutinate neodymium-iron-boron strong magnet comprises epoxidized soybean oil, calcium carbonate superfine powder powder, carbon black;
Preferably, the rubber of Agglutinate neodymium-iron-boron strong magnet is natural rubber or synthetic rubber;
Preferably, the functional plastic of Agglutinate neodymium-iron-boron strong magnet comprises one or both in nylon, the polyphenylene sulfide.
Another object of the present invention is to provide a kind of preparation method of Agglutinate neodymium-iron-boron strong magnet, may further comprise the steps:
1) will drop into mixer mixing through the Agglutinate neodymium-iron-boron strong magnet raw material that mixer mixes, mixing pressure is 2～8 ton forces, and melting temperature is 50～100 ℃;
2) material after mixing being broken into particle diameter is to drop in the calender behind the particle below 5 millimeters, is 1～8 ton force at pressure, and temperature is to roll processing under 26～90 ℃ the condition;
3) will carry out surface oxidation-resistant through the material after calendering is handled and handle, after moulding, the step that magnetizes, obtain finished product again.
Preferably, the mixing temperature of the raw material in the step 1) in mixer is 26～60 ℃;
Preferably, the surface oxidation-resistant processing method in the step 3) adopts and can be adsorbed on the material that product surface forms separator;
Preferably, can be adsorbed on the material that product surface forms separator is epoxy resin.
Beneficial effect of the present invention is:
1) product density is little, and magnetic property is even and stable, is to realize one of basic material that product " light, thin, little, little " is comparatively desirable;
2) impact strength is big, and is good to dielectric stabilities such as acid, alkali, oil, water;
3) good processability, easy-formation, production efficiency is high; Its change in size is little; Be prone to be processed into the goods of dimensional accuracy height, thin-wall complicated shape, back processing such as goods can cut, cut, boring, lamination and embossing, and can be not chipping when using; The goods of plastic complicacy can also be one-body molded etc. with other elements.
Description of drawings
The reader with reference to advantages after the embodiment of the present invention, will become apparent various aspects of the present invention.Wherein,
Fig. 1 shows according to the present invention, the process chart of preparation Agglutinate neodymium-iron-boron strong magnet.
Embodiment
In order more to be expressly understood technology contents of the present invention, with reference to the accompanying drawings, execution mode of the present invention is done further to describe in detail.
The main material of Agglutinate neodymium-iron-boron strong magnet comprises that percentage by weight is 80～95% NdFeB magnetic powder, and 0～20% ferrite rubber magnetic powder, adhesive comprise that percentage by weight is 0～20% rubber; 0～20% functional plastic, auxiliary agent comprise that percentage by weight is 0.05～4% zinc stearate, 0.05～2% stearic acid; 0.05～2% magnesia, 1～1.8% heterocyclic age resistor, 1～2% oxidation inhibitor; 1～20% epoxy resin, and other additive of 1～3%, other additive comprises epoxidized soybean oil; The calcium carbonate superfine powder powder, carbon black etc.Wherein, the amount of ferrite rubber magnetic powder is added according to performance of products, can adopt natural rubber also can adopt synthetic rubber as the rubber of adhesive, and functional plastic is the thermoplasticity or the heat cured compound material of nylon, polyphenylene sulfide series.
Fig. 1 shows according to the present invention, the process chart of preparation Agglutinate neodymium-iron-boron strong magnet.
Embodiment 1
With reference to Fig. 1; It at first is 85% NdFeB magnetic powder with percentage by weight; 2% ferrite rubber magnetic powder, 8% rubber, 0.5% nylon; And in 4.5% the auxiliary agent input mixer, how many its reinforced orders should according to performance requirement, compounding ingredient role, the performance of dispersion and the deciding of consumption of broken-down rubber.In the present embodiment, add earlier adhesive and auxiliary agent, add again and become owner of material various proportion material different are mixed.Then mixed material is dropped into mixing in the banbury, plasticizing (S1), melting temperature should suit, and the temperature height helps the plastic flowing and the distortion of rubber and sizing material; Help rubber powder is eaten in the moistening and mixing of solid compounding ingredient particle surface, but the viscosity of sizing material is descended, be unfavorable for the fragmentation and the dispersing and mixing of compounding ingredient particle; The too high thermo-oxidative ageing that also can quicken rubber of melting temperature; The physical and mechanical properties of vulcanizate is descended, the refining phenomenon promptly occurred, also can make sizing material generation incipient scorch phenomenon; But temperature can not be too low, presses the phenomenon of loosing otherwise sizing material can occur.Therefore; The temperature of material in banbury is set to 50 ℃, and pressure is set to 2 ton forces and mixes, refines material, when the temperature of material in banbury reaches 100 ℃; When pressure reaches 8 ton forces; Material after mixing is dropped into jaw crusher be ground into the fritter below 25 millimeters, and then throw to ball mill and further pulverize, make that the material particular diameter after pulverizing is no more than 5 millimeters (S2).Then, these are broken into particle size values through the unification of heating back send into calender at the particle below 5 millimeters, sizing material is before getting into calender, and temperature is controlled at 20～65 ℃.Calender has relative rotation, horizontally disposed two rollers, has roll gap between two rollers, and sizing material is at 26 ℃; 1.5 being extended into thickness through roll gap under the pressure of ton force is 8 millimeters film (S3); Get 3% epoxy resin, it is in harmonious proportion evenly pours afterwards rod on the glue spreader into, epoxy resin passes through from following rod; Method with gluing is evenly coated skim on the film surface; Film after being coated with forms the separator (S4) that one deck has anti-oxidation effect through the infrared-ray dryer oven dry, also can use 0.02～0.1 millimeter film, with the press mold machine temperature rod of film through 40～70 ℃ is attached on the Agglutinate neodymium-iron-boron product surface.To pass through the film cooling forming (S5) that oxidation processes forms separator then, after in the pulse magnet charger, magnetize (S6), obtain finished product through packing (S7).
With reference to Fig. 1; It at first is 87% NdFeB magnetic powder with percentage by weight; 4% ferrite rubber magnetic powder, 3.5% rubber, 0.5% polyphenylene sulfide; And in 5% the auxiliary agent input mixer, how many its reinforced orders should according to performance requirement, compounding ingredient role, the performance of dispersion and the deciding of consumption of broken-down rubber.In the present embodiment, add adhesive and auxiliary agent earlier, add again and become owner of material, various proportion material different are mixed.Then mixed material is dropped into mixing in the banbury, plasticizing (S1), melting temperature should suit, and the temperature height helps the plastic flowing and the distortion of rubber and sizing material; Help rubber powder is eaten in the moistening and mixing of solid compounding ingredient particle surface, but the viscosity of sizing material is descended, be unfavorable for the fragmentation and the dispersing and mixing of compounding ingredient particle; The too high thermo-oxidative ageing that also can quicken rubber of melting temperature; The physical and mechanical properties of vulcanizate is descended, the refining phenomenon promptly occurred, also can make sizing material generation incipient scorch phenomenon; But temperature can not be too low, presses the phenomenon of loosing otherwise sizing material can occur.Therefore; The temperature of material in banbury is set to 100 ℃; Pressure is set to 2 ton forces and mixes, refines material; When the pressure of material in banbury reaches 8 ton forces, the material after mixing is dropped into jaw crusher be ground into the fritter below 25 millimeters and then throw to ball mill and further pulverize, make that the material particular diameter after pulverizing is no more than 5 millimeters (S2).Then, these are broken into particle size values through the unification of heating back send into calender at the particle below 5 millimeters, sizing material is before getting into calender, and temperature is controlled at 20～65 ℃.Calender has relative rotation, horizontally disposed two rollers, has roll gap between two rollers, and sizing material is at 90 ℃, and being extended into thickness through roll gap under the pressure of 1～8 ton force is 0.2 millimeter film (S3).Get 6% epoxy resin; Pour rod on the glue spreader into after being in harmonious proportion it evenly; Epoxy resin passes through from following rod, evenly coats skim on the film surface with the method for gluing, and the film after being coated with forms the separator (S4) that one deck has anti-oxidation effect through the infrared-ray dryer oven dry; Also can use 0.02～0.1 millimeter film, the temperature rod of film through 40～70 ℃ attached on the Agglutinate neodymium-iron-boron product surface with the press mold machine.To pass through the film cooling forming (S5) that oxidation processes forms separator then, after in the pulse magnet charger, magnetize (S6), obtain finished product through packing (S7).
Therefore, by Agglutinate neodymium-iron-boron strong magnet of the present invention and preparation method thereof, the product fragility of producing is little, magnetic is high and stable, is easy to assembling, and simultaneously, preparation cost is low, and efficient is high, and is energy-saving and cost-reducing, and environment friendly non-halogen, and environmental pollution is little.
Embodiment of the present invention has been described in the preceding text.But those of ordinary skill in the art can be understood, and under the situation without departing from the spirit and scope of the present invention, can also specific embodiments of the invention do various changes and replacement.These changes and replacement all drop in claims restricted portion of the present invention.
Claims (9)
1. an Agglutinate neodymium-iron-boron strong magnet is characterized in that, raw material comprises that percentage by weight is 80～95% NdFeB magnetic powder, 0～20% ferrite rubber magnetic powder, and 0～20% rubber, 0～20% functional plastic, surplus is an auxiliary agent.
2. Agglutinate neodymium-iron-boron strong magnet as claimed in claim 1 is characterized in that said auxiliary agent comprises zinc stearate; Stearic acid, magnesia, heterocyclic age resistor; Oxidation inhibitor, epoxy resin, and other additive; Calculate by weight, the ratio of each composition is 0.05～4: 0.05～2 in the said auxiliary agent: 0.05～2: 1～1.8: 1～2: 1～20: 1～3.
3. Agglutinate neodymium-iron-boron strong magnet as claimed in claim 2 is characterized in that, said other additive comprises epoxidized soybean oil, calcium carbonate superfine powder powder, carbon black.
4. Agglutinate neodymium-iron-boron strong magnet as claimed in claim 1 is characterized in that, said rubber is natural rubber or synthetic rubber.
5. Agglutinate neodymium-iron-boron strong magnet as claimed in claim 1 is characterized in that said functional plastic comprises one or both in nylon, the polyphenylene sulfide.
6. the preparation method of an Agglutinate neodymium-iron-boron strong magnet is characterized in that, may further comprise the steps:
1) will drop into mixer mixing through the said Agglutinate neodymium-iron-boron strong magnet raw material that mixer mixes, mixing pressure is 2～8 ton forces, and melting temperature is 50～100 ℃;
2) material after mixing being broken into particle diameter is to drop in the calender behind the particle below 5 millimeters, is 1～8 ton force at pressure, and temperature is to roll processing under 26～90 ℃ the condition;
3) will carry out surface oxidation-resistant through the material after calendering is handled and handle, after moulding, the step that magnetizes, obtain finished product again.
7. the preparation method of Agglutinate neodymium-iron-boron strong magnet as claimed in claim 6 is characterized in that, the mixing temperature of raw material described in the said step 1) in mixer is 26～60 ℃.
8. the preparation method of Agglutinate neodymium-iron-boron strong magnet as claimed in claim 6 is characterized in that, the said surface oxidation-resistant processing method in the said step 3) adopts and can be adsorbed on the material that product surface forms separator.
9. the preparation method of Agglutinate neodymium-iron-boron strong magnet as claimed in claim 8 is characterized in that, the said material that can be adsorbed on product surface formation separator is an epoxy resin.
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| CN104779026A (en) * | 2015-04-30 | 2015-07-15 | 安徽百宏达汽车电器有限公司 | Neodymium-iron-boron bonded rare earth permanent magnet with strong antioxidant ability |
| CN104810123A (en) * | 2015-04-30 | 2015-07-29 | 安徽百宏达汽车电器有限公司 | Composite bonded rare-earth permanent magnet |
| CN105397082A (en) * | 2015-12-01 | 2016-03-16 | 横店集团东磁股份有限公司 | Method for preparing plastic particle master batch through magnetic material |
| CN106816250A (en) * | 2017-03-08 | 2017-06-09 | 安徽省东方磁磁铁制造有限公司 | A kind of high-temperature-resistant and anti-corrosion Nd-Fe-B permanent magnet and preparation method thereof |
| CN107619603A (en) * | 2017-11-08 | 2018-01-23 | 绵阳美胜邦科技有限公司 | A kind of corrosion-resistant high toughness polyphenyl thioether rare earth composite material and preparation method thereof |
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| CN104810123A (en) * | 2015-04-30 | 2015-07-29 | 安徽百宏达汽车电器有限公司 | Composite bonded rare-earth permanent magnet |
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| CN107619603A (en) * | 2017-11-08 | 2018-01-23 | 绵阳美胜邦科技有限公司 | A kind of corrosion-resistant high toughness polyphenyl thioether rare earth composite material and preparation method thereof |
| CN110021468A (en) * | 2019-05-23 | 2019-07-16 | 温州市享通塑磁科技有限公司 | A kind of flexibility NdFeB material and preparation method thereof |
| CN110289704A (en) * | 2019-07-10 | 2019-09-27 | 包头金山磁材有限公司 | A kind of magneto magnet and preparation method thereof |
| CN111524671B (en) * | 2020-04-30 | 2022-04-12 | 和也健康科技有限公司 | Preparation method of high-corrosion-resistance coating on surface of flexible bonded neodymium iron boron-nickel zinc ferrite composite magnet |
| CN111524671A (en) * | 2020-04-30 | 2020-08-11 | 和也健康科技有限公司 | Preparation method of high-corrosion-resistance coating on surface of flexible bonded neodymium iron boron-nickel zinc ferrite composite magnet |
| CN113693412A (en) * | 2020-05-21 | 2021-11-26 | 和也健康科技有限公司 | Flexible massage pillow |
| CN113693412B (en) * | 2020-05-21 | 2023-03-07 | 和也健康科技有限公司 | Flexible massage pillow |
| 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 |
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Effective date of registration: 20170619 Address after: Jinhua City, Zhejiang province 321000 Dragon Town Wucheng District Zheng Yang Village Patentee after: Jinhua magnet Life Science & Technology Co Ltd Address before: 322000, Jinhua City, Zhejiang province Yiwu City Town West Yi Industrial Park Patentee before: Yiwu Magnet Life Co.,Ltd. |