CN108242307A - A kind of isotropism NdFeB Bonded Magnets based on high-temperature resistant bonding system and preparation method thereof - Google Patents
A kind of isotropism NdFeB Bonded Magnets based on high-temperature resistant bonding system and preparation method thereof Download PDFInfo
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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
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
- H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
- H01F1/0571—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
- H01F1/0575—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together
- H01F1/0578—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together bonded together
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
- B22F1/103—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material containing an organic binding agent comprising a mixture of, or obtained by reaction of, two or more components other than a solvent or a lubricating agent
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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
- H01F41/0253—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 for manufacturing permanent magnets
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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
- H01F41/0253—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 for manufacturing permanent magnets
- H01F41/0266—Moulding; Pressing
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- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
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- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
A kind of isotropism NdFeB Bonded Magnets based on high-temperature resistant bonding system and preparation method thereof, belong to technical field of function materials.The present invention uses isotropism NdFeB magnetic powders as magnetisable material, and using the aqueous epoxy resins after chemical modification/sodium metasilicate compound as binding agent, high temperature tolerance energy isotropism NdFeB Bonded Magnets are made.The magnet of gained has excellent heat resistance, good magnetic performance, smaller hydroscopicity and outstanding mechanical property, can meet normal use at 200 DEG C.It is easy to operate, cost is relatively low in entire implementation process, it is suitble to large-scale production, higher economic value has larger application space in permanent-magnet material field.
Description
Technical field
The present invention relates to a kind of isotropism Agglutinate neodymium-iron-boron (NdFeB) magnet with high temperature resistance and its preparation sides
Method.Belong to technical field of function materials.
Background technology
NdFeB binding electromagnetic materials are added in adhesive by NdFeB magnetic powders and are made, and are successfully opened in the eighties in last century
It issues, as a kind of high performance permanent magnetic materials, develops in recent years very rapid；Due to bonded NdFeB Permanent magnet magnetism of material energy
Stablize, cost is relatively low, easy batch production, be easily processed into that size is smaller and more accurate part and be widely used in electronics electricity
Device, automation equipment and automobile manufacturing field etc.；There are mainly four types of forming methods for bonded permanent magnet at this stage：Compression molding, injection
Molding, extrusion forming and calendering formation；Wherein compression molding due to method it is simple, binder amount addition is few, and magnetic property is higher, institute
Widely to be paid close attention to.
But due to being influenced by the heat resistance of epoxy adhesive in itself, bonded permanent magnet is limited in the high temperature environment
It uses；Therefore, the isotropism NdFeB Bonded Magnets of novel high-temperature resistant bonding system are developed to normal work at relatively high temperatures
Work is very necessary.
A kind of high-performance NdFeB Bonded Magnets and its system are described in the patent 201710135252.9 of application in 2017
Preparation Method prepares bonded permanent magnet using the bonding system of haloflex composite epoxy, and shortcoming is haloflex
Heat resistance is poor, it is impossible to the normal use under worst hot case.
A kind of use sodium metasilicate is reported in the patent JP 09129466 of Japanese publication in 1997 to prepare as binding agent
The method of magnet components, component obtained can work normally in high temperature environment；But magnet assembly is there are moisture absorption big
Problem.
A kind of high-temperature resistant isotropism is described in the patent 201510660957.3 of application in 2015 and bonds NdFeB magnetic
Body and preparation method, since sodium metasilicate has higher temperature tolerance and intensity, and epoxy resin has good toughness, corrosion-resistant
The advantages that property, resistance to hygroscopicity, prepares bonded permanent magnet, Neng Gouyou using the bonding system of sodium metasilicate and epoxy resin physical mixed
The heat resistance of the increase bonded permanent magnet of effect, but sodium metasilicate and epoxy resin are belonging respectively to hydrophily and hydrophobicity, compatibility compared with
Difference, it is impossible to uniform bonding system is thoroughly mixed to form, so as to be affected to the mechanical property of magnet and resistance to moisture pick-up properties.
Invention content
It is a kind of based on novel present invention aims at providing for above-mentioned NdFeB Bonded Magnets and the deficiency of preparation method
Isotropism NdFeB Bonded Magnets of high-temperature resistant bonding system and preparation method thereof, by preparing a kind of water-base epoxy/sodium metasilicate
Chemically composited bonding system is used for NdFeB Bonded Magnets, can greatly improve the compatibility and bonded permanent magnet of its bonding system
Heat resistance, its operating ambient temperature is made to reach 200 DEG C, and effectively improve bonded permanent magnet mechanical property and resistance to moisture absorption.
A kind of high temperature tolerance energy isotropism NdFeB Bonded Magnets of the present invention, which is characterized in that be with isotropism
NdFeB magnetic powders and the chemically composited binding agent of aqueous epoxy resins/sodium metasilicate are main composition, add proper amount of surfactant and
Prepared by lubricant bonded permanent magnet；The chemically composited binding agent primary raw material of aqueous epoxy resins/sodium metasilicate is wherein prepared as ring
Oxygen resin, polyethylene glycol, maleic anhydride and sodium metasilicate.The mass percent of magnet constitutive material is：Isotropism magnetic powder 91-
96%th, aqueous epoxy resins/sodium metasilicate compound binding agent 2-8%, surfactant 0.5-1%, lubricant 0.5-1%；
The epoxy resin is one or more of E-42, E-44, E-51, E-54 and E-55；
The polyethylene glycol is one or more of PEG-800, PEG-1000, PEG-2000；
The surfactant is stearic acid, Aluminate, titanate esters, one kind in KH550, KH560, KH570 or several
Kind；
The lubricant is one or more of paraffin, glycerine, esters of silicon acis, silicone oil；
It is as follows that the present invention prepares a kind of high temperature tolerance energy isotropism NdFeB Bonded Magnets process, including six steps：
A certain amount of polyethylene glycol and maleic anhydride are stirred to react 1-7 hours by the first step at 30-90 DEG C；Then plus
Enter a certain amount of epoxy resin, be stirred to react at 90-130 DEG C 3-8 hours, then obtain aqueous epoxy resins；
Second step, the aqueous epoxy resins that the first step is obtained add in distilled water, are mixed into 30-70wt.% solid contents
Then epoxy emulsion with sodium silicate aqueous solution by certain mass ratio is uniformly mixed, obtains water-soluble epoxy resin/silicon at room temperature
Sour Sodium chemistry compound binding agent.
Third walks, and isotropic NdFeB magnetic powders with one or more of in surfactant are uniformly mixed, are mixed
Magnetic powder A；
4th step, the aqueous epoxy resins that bonding magnetic powder A and second step that third walks are obtained/silicic acid Sodium chemistry are answered
It closes binding agent to be mixed in a certain ratio, stir evenly until magnetic powder is stirred evenly after adding lubricant, is sprayed in after fluffy
Solvent accelerates the volatilization of moisture in binding agent, continues to stir, until fluffy, obtains mixing magnetic powder B；Gross mass presses 100%
It calculates, wherein NdFeB magnetic powders account for 91%-96%, and surfactant accounts for 0.5%-1%, and lubricant accounts for 0.5%-1%, and chemistry is multiple
It closes binding agent and accounts for 2%-8%；
The mixing magnetic powder B that 4th step obtains is placed in jolt ramming in mold by the 5th step, the compression moulding in compression molding forming machine,
Demoulding obtains initial magnet base, then magnet base is placed in equal pressing equipment, pressure 100MPa-500MPa, the dwell time
20-300s obtains densification magnet base C.
The densification magnet base C that 5th step obtains is placed in the environment of vacuum or inert gas shielding and cures by the 6th step,
Obtain the isotropic NdFeB magnets of high temperature tolerance energy；Solidification temperature is 175-200 DEG C, hardening time 30-40min.
A certain amount of polyethylene glycol, maleic anhydride and epoxy resin described in the first step, three's molar ratio are 1:(1-
3):(1-4)。
Epoxy emulsion described in second step is with sodium silicate aqueous solution according to mass ratio 1：The ratio of 5-9 is mixed to prepare.
The sodium silicate aqueous solution, modulus range 1.6-3.4, Baume degrees range 38-51o。
Organic solvent described in 4th step is one or more of acetone, ethyl alcohol, methanol, ethyl acetate, toluene.
Bonded permanent magnet technique is relatively simple, can prepare complex-shaped part, is easy to batch production, accuracy to size
Height, but the long term high temperature that can not meet of conventional isotropism NdFeB Bonded Magnets uses, and bonding is limited from this respect
The application field of NdFeB magnets.So exploitation high temperature tolerance energy isotropism NdFeB Bonded Magnets are in broadening application field side
Face has very big meaning.
The present invention has the advantages that compared with prior art.
The heat resistance of isotropism NdFeB Bonded Magnets prepared using the present invention significantly improves, and disclosure satisfy that 200 DEG C
In the environment of normal use；It is chemically composited compared with bonded permanent magnet prepared by physical mixed sodium metasilicate/epoxy resin bonding system
While sodium metasilicate/epoxy resin cohesive body still keeps higher magnetic property, have excellent mechanical property and resistance to hygroscopicity
Can, compression strength is up to 120MPa, and hydroscopicity is minimum to drop to 0.3%.
Specific embodiment：
With reference to specific embodiment, the present invention will be further described, but the present invention is not limited to following instances.
Embodiment 1：A kind of preparation method of high temperature tolerance energy isotropism NdFeB Bonded Magnets, carries out according to the following steps：
It has to proportional region embody the upper limit, lower limit and numerical value placed in the middle in embodiment involved in claims.
The maleic anhydride of 0.2mol polyethylene glycol-800s and 0.2mol are stirred to react 1 hour, so by the first step at 90 DEG C
The epoxy resin E42 of 0.2mol is added in afterwards, is stirred 8 hours at 90 DEG C, is then obtained aqueous epoxy resins.
Second step, the aqueous epoxy resins that the first step is obtained add in distilled water, are mixed into the epoxy of 30wt.% solid contents
Lotion, then with sodium silicate binder (modulus 1.6, Baume degrees 38o) it is 1 in mass ratio:9 are uniformly mixed at room temperature, obtain
Water-soluble epoxy resin/sodium metasilicate compound binding agent.
Third walks, and the isotropic NdFeB magnetic powders of 91g are uniformly mixed with the stearic acid of 0.5g, obtains mixing magnetic powder A1.
4th step adds aqueous epoxy resins/sodium metasilicate compoiste adhering of 8g in the bonding magnetic powder A1 walked in third
Agent is stirred evenly until magnetic powder accelerates moisture in binding agent in the ethyl alcohol for the paraffin sprinkling 2ml for after fluffy, adding 0.5g
Volatilization, continues to stir, until fluffy, obtains mixing magnetic powder B1.
The mixing magnetic powder B1 that 4th step obtains is placed in jolt ramming in mold by the 5th step, the compression moulding in compression molding forming machine,
Demoulding obtains initial magnet base, then magnet base is placed in equal pressing equipment, pressure 100MPa, dwell time 300s is obtained
To densification magnet base C1.
The densification magnet base C1 that 5th step obtains is placed in the environment of vacuum or inert gas shielding by the 6th step
Cure 40min at a temperature of 175 DEG C, obtain the isotropic NdFeB magnets 1# (chemically composited) of high temperature tolerance energy.
Using the identical processing step of this embodiment, the chemically composited binding agent of aqueous epoxy resins/sodium metasilicate is replaced
Into aqueous epoxy resins/sodium metasilicate physical mixed binding agent of phase homogenous quantities, isotropic bonded magnet 1# " (physics obtained
Mixing).
Two kinds of isotropism NdFeB Bonded Magnets 1# (chemically composited) of this embodiment gained, the room of 1# " (physical mixed)
Magnetic property at 20 DEG C and 200 DEG C of temperature is as shown in table 1.Two kinds of isotropism NdFeB Bonded Magnets 1# (change obtained by this embodiment
Learn compound), the compressive property of 1# " (physical mixed) and resistance to moisture pick-up properties it is as shown in table 2.
1 isotropism NdFeB Bonded Magnets 1# (chemically composited) of table, at 20 DEG C and 200 DEG C of 1# " (physical mixed) room temperature
Magnetic property
2 isotropism NdFeB Bonded Magnets 1# (chemically composited) of table, the compression strength of 1# " (physical mixed) at room temperature
Embodiment 2：A kind of preparation method of high temperature tolerance energy isotropism NdFeB Bonded Magnets, carries out according to the following steps：
The maleic anhydride of 0.2mol polyethylene glycol 2000s and 0.6mol are stirred to react 7 hours, so by the first step at 30 DEG C
The epoxy resin E55 of 0.8mol is added in afterwards, is stirred 3 hours at 130 DEG C, is then obtained aqueous epoxy resins.
Second step, the aqueous epoxy resins that the first step is obtained add in distilled water, are mixed into the epoxy of 70wt.% solid contents
Lotion, then with sodium silicate binder (modulus 3.4, Baume degrees 51o) it is 1 in mass ratio:5 are uniformly mixed at room temperature, obtain
The chemically composited binding agent of water-soluble epoxy resin/sodium metasilicate.
Third walks, and the isotropic NdFeB magnetic powders of 96g are uniformly mixed with the KH570 of 1g, obtains mixing magnetic powder A2.
4th step adds aqueous epoxy resins/sodium metasilicate compoiste adhering of 2g in the bonding magnetic powder A2 walked in third
Agent is stirred evenly until magnetic powder accelerates waving for moisture in binding agent in the methanol for the silicone oil sprinkling 4ml for after fluffy, adding 1g
Hair, continues to stir, until fluffy, obtains mixing magnetic powder B2.
The mixing magnetic powder B1 that 4th step obtains is placed in jolt ramming in mold by the 5th step, the compression moulding in compression molding forming machine,
Demoulding obtains initial magnet base, then magnet base is placed in equal pressing equipment, pressure 500MPa, dwell time 20s is obtained
It is densified magnet base C2.
The densification magnet base C1 that 5th step obtains is placed in the environment of vacuum or inert gas shielding by the 6th step
Cure 30min at a temperature of 200 DEG C, obtain the isotropic NdFeB magnets 2# (chemically composited) of high temperature tolerance energy.
Using the identical processing step of this embodiment, the chemically composited binding agent of aqueous epoxy resins/sodium metasilicate is replaced
Into aqueous epoxy resins/sodium metasilicate physical mixed binding agent of phase homogenous quantities, isotropic bonded magnet 2# " (physics obtained
Mixing).
The obtained two kinds of isotropism NdFeB Bonded Magnets 2# (chemically composited) of this embodiment, 2# " (physical mixed)
20 DEG C and 200 DEG C of room temperature at magnetic property it is as shown in table 3.Two kinds of isotropism NdFeB Bonded Magnets obtained by this embodiment
2# (chemically composited), the compressive property of 2# " (physical mixed) and resistance to moisture pick-up properties are as shown in table 4.
3 isotropism NdFeB Bonded Magnets 2# (chemically composited) of table, at 20 DEG C and 200 DEG C of 2# " (physical mixed) room temperature
Magnetic property
4 isotropism NdFeB Bonded Magnets 2# (chemically composited) of table, the compression strength of 2# " (physical mixed) at room temperature and
Resistance to moisture pick-up properties
Embodiment 3：A kind of preparation method of high temperature tolerance energy isotropism NdFeB Bonded Magnets, carries out according to the following steps：
The maleic anhydride of 0.2mol cetomacrogol 1000s and 0.4mol are stirred to react 5 hours, so by the first step at 60 DEG C
The epoxy resin E51 of 0.6mol is added in afterwards, is stirred 6 hours at 110 DEG C, is then obtained aqueous epoxy resins.
Second step, the aqueous epoxy resins that the first step is obtained add in distilled water, are mixed into the epoxy of 50wt.% solid contents
Lotion, then with sodium silicate binder (modulus 3.0, Baume degrees 41o) it is 1 in mass ratio:6 are uniformly mixed at room temperature, obtain
The chemically composited binding agent of water-soluble epoxy resin/sodium metasilicate.
Third walks, and the isotropic NdFeB magnetic powders of 95g are uniformly mixed with the KH550 of 0.6g, obtains mixing magnetic powder A3.
4th step adds aqueous epoxy resins/sodium metasilicate compoiste adhering of 4g in the bonding magnetic powder A3 walked in third
Agent is stirred evenly until magnetic powder is accelerated in the ethyl acetate for the esters of silicon acis sprinkling 3ml for after fluffy, adding 0.4g in binding agent
The volatilization of moisture continues to stir, until fluffy, obtains mixing magnetic powder B3.
The mixing magnetic powder B3 that 4th step obtains is placed in jolt ramming in mold by the 5th step, the compression moulding in compression molding forming machine,
Demoulding obtains initial magnet base, then magnet base is placed in equal pressing equipment, pressure 240MPa, dwell time 200s is obtained
To densification magnet base C3.
The densification magnet base C3 that 5th step obtains is placed in the environment of vacuum or inert gas shielding by the 6th step
Cure 35min at a temperature of 190 DEG C, obtain the isotropic NdFeB magnets 3# (chemically composited) of high temperature tolerance energy.
Using the identical processing step of this embodiment using the identical processing step of this embodiment, by water-base epoxy tree
The chemically composited binding agent of fat/sodium metasilicate is substituted for aqueous epoxy resins/sodium metasilicate physical mixed binding agent of phase homogenous quantities, is made
Isotropic bonded magnet 3# " (physical mixed).
The obtained two kinds of isotropism NdFeB Bonded Magnets 3# (chemically composited) of this embodiment, 3# " (physical mixed)
20 DEG C and 200 DEG C of room temperature at magnetic property it is as shown in table 5.Two kinds of isotropism NdFeB Bonded Magnets obtained by this embodiment
3# (chemically composited), the compressive property of 3# " (physical mixed) and resistance to moisture pick-up properties are as shown in table 6.
5 isotropism NdFeB Bonded Magnets 3# (chemically composited) of table, at 20 DEG C and 200 DEG C of 3# " (physical mixed) room temperature
Magnetic property
6 isotropism NdFeB Bonded Magnets 3# (chemically composited) of table, the compression strength of 3# " (physical mixed) at room temperature and
Resistance to moisture pick-up properties
Claims (10)
1. a kind of high temperature tolerance energy isotropism NdFeB Bonded Magnets, which is characterized in that be with isotropism NdFeB magnetic powders and
The chemically composited binding agent of aqueous epoxy resins/sodium metasilicate is main composition, adds proper amount of surfactant and lubricant and makes
The bonded permanent magnet obtained；The chemically composited binding agent primary raw material of aqueous epoxy resins/sodium metasilicate is wherein prepared as epoxy resin, poly- second
Glycol, maleic anhydride and sodium metasilicate；The mass percent of magnet constitutive material is：Isotropism magnetic powder 91-96%, water-base epoxy
Resin/sodium metasilicate compound binding agent 2-8%, surfactant 0.5-1%, lubricant 0.5-1%.
2. a kind of high temperature tolerance energy isotropism NdFeB Bonded Magnets described in accordance with the claim 1, which is characterized in that described
Epoxy resin one or more of for E-42, E-44, E-51, E-54 and E-55.
3. a kind of high temperature tolerance energy isotropism NdFeB Bonded Magnets described in accordance with the claim 1, which is characterized in that described
Polyethylene glycol one or more of for PEG-800, PEG-1000, PEG-2000.
4. a kind of high temperature tolerance energy isotropism NdFeB Bonded Magnets described in accordance with the claim 1, which is characterized in that described
Surfactant be stearic acid, Aluminate, titanate esters, one or more of KH550, KH560, KH570.
5. a kind of high temperature tolerance energy isotropism NdFeB Bonded Magnets described in accordance with the claim 1, which is characterized in that described
Lubricant be paraffin, glycerine, esters of silicon acis, one or more of silicone oil.
6. prepare the method for claim 1-5 any one of them high temperature tolerance energy isotropism NdFeB Bonded Magnets, feature
It is, includes the following steps：
A certain amount of polyethylene glycol and maleic anhydride are stirred to react 1-7 hours by the first step at 30-90 DEG C；Then one is added in
Quantitative epoxy resin is stirred to react 3-8 hours at 90-130 DEG C, then obtains aqueous epoxy resins；
Second step, the aqueous epoxy resins that the first step is obtained add in distilled water, are mixed into the epoxy of 30-70wt.% solid contents
Then lotion with sodium silicate aqueous solution by certain mass ratio is uniformly mixed, obtains water-soluble epoxy resin/sodium metasilicate at room temperature
Chemically composited binding agent；
Third walks, and isotropic NdFeB magnetic powders with one or more of in surfactant are uniformly mixed, obtain mixing magnetic powder
A；
4th step, aqueous epoxy resins/sodium metasilicate that bonding magnetic powder A and second step that third walks are obtained are chemically composited viscous
Knot agent is mixed in a certain ratio, and is stirred evenly until magnetic powder is stirred evenly in after fluffy after adding lubricant, sprinkling is organic molten
Agent accelerates the volatilization of moisture in binding agent, continues to stir, until fluffy, obtains mixing magnetic powder B；Gross mass is based on 100%
It calculates, wherein NdFeB magnetic powders account for 91%-96%, and surfactant accounts for 0.5%-1%, and lubricant accounts for 0.5%-1%, chemically composited
Binding agent accounts for 2%-8%；
The mixing magnetic powder B that 4th step obtains is placed in jolt ramming in mold by the 5th step, the compression moulding in compression molding forming machine, demoulding
Initial magnet base is obtained, then magnet base is placed in equal pressing equipment, pressure 100MPa-500MPa, dwell time 20-
300s obtains densification magnet base C；
The densification magnet base C that 5th step obtains is placed in the environment of vacuum or inert gas shielding and cures, obtains by the 6th step
The isotropic NdFeB magnets of high temperature tolerance energy；Solidification temperature is 175-200 DEG C, hardening time 30-40min.
7. according to the method for claim 6, which is characterized in that a certain amount of polyethylene glycol, maleic acid described in the first step
Acid anhydride and epoxy resin, three's molar ratio are 1:(1-3):(1-4).
8. according to the method for claim 6, which is characterized in that the epoxy emulsion described in second step is pressed with sodium silicate aqueous solution
According to mass ratio 1：The ratio mixing of 5-9.
9. according to the method for claim 6, which is characterized in that the sodium silicate aqueous solution, modulus range 1.6-3.4,
38-51 ° of Baume degrees range.
10. according to the method for claim 6, which is characterized in that the organic solvent described in the 4th step is acetone, ethyl alcohol, first
One or more of alcohol, ethyl acetate, toluene.
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| CN110660553A (en) * | 2019-09-06 | 2020-01-07 | 包头市科锐微磁新材料有限责任公司 | Isotropic hot-pressed neodymium iron boron quick-quenched magnetic powder and preparation method thereof |
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