JP2000119702A - Production of compound for rare earth bond magnet and producing device for compound for rare earth bond magnet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a producing method of a compound for a rare earth bond magnet small in the generation of crushing of a raw material alloy powder particle in the production of the compound, excellent in magnetic property of the bond magnet and moreover, capable of continuously compounding it for a short time. SOLUTION: This producing method comprises a slurry preparing process by mixing a material containing a powdery rare earth alloy magnetic body, a reaction curing resin and an organic solvent to form slurry by a slurry preparing device 1 and a drying process for producing a compound composed of the powdery rare earth alloy magnetic body and the reaction curing resin by spraying the slurry in a spray drying device 5 to dry it in a moment. The organic solvent preferably contains a good solvent and a poor solvent for the reaction curing resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an R-Fe-B alloy, an R-Co alloy, and an R-Fe-N alloy (R is Sm,
Indicates a rare earth element such as Nd. The present invention relates to a method for producing a powdery granular rare earth bonded magnet compound used for a bonded magnet formed into a predetermined shape using a magnetic powder containing a rare earth element such as a) and a resin component as a binder.

[0002]

2. Description of the Related Art A permanent magnet formed in a predetermined shape is indispensable as a component of a motor or an actuator used in home electric appliances, automobiles, computers and peripheral devices thereof. The miniaturization, energy saving, and weight reduction of these final products are always required issues, and motors and actuators are also constantly required to be smaller, lighter, and higher in performance. There is a demand for smaller and stronger permanent magnet molded articles.

[0003] Such permanent magnet molded products are generally classified into two types: sintered magnets and bonded magnets. The sintered magnet is manufactured by molding a magnet fine powder into a fixed shape using a high molecular weight resin as a binder, heating the powder to remove or incinerate the binder, and then sintering. Therefore, although it is almost composed of only the permanent magnet body alloy component and has excellent magnetic properties and is preferable, both a step of forming the magnet and a step of sintering are required. In addition, there is a problem that sintering requires a relatively long time and that the product rejection rate is high due to large shrinkage during sintering.

[0004] On the other hand, a bonded magnet uses a thermosetting resin as a binder and is formed into a predetermined shape with a magnet powder and a resin. The ratio decreases. As a result, although the magnet strength is inferior to sintered magnets, the dimensional change in the steps after molding is small, the defect rate is low, and if the shape of the mold is devised, it can respond to various product shapes, and the product obtained Has the feature of being excellent in the degree of freedom of the shape.

[0005] A bonded magnet is prepared by mixing and coating a magnet powder and a thermoreactive resin raw material to form a powdery granular molding compound, compression-molding in a mold having a predetermined shape, and heating to react and cure as a binder. It is completed by reacting and curing the reactive resin material. Conventionally, such a compound has been manufactured by the following steps.

(1) A rare earth alloy magnet powder of 250 μm
m or less, usually about 30 to 250 μm, and then a reaction curable resin material and a solvent are added and kneaded with a kneading device such as a kneader. (2) The kneaded product composed of the obtained magnet powder and the reaction curable resin is sometimes in a large lump, and is not suitable for molding as it is. (3) The crushed kneaded material is dried to remove the solvent. (4) The kneaded material after drying, that is, the compound is sieved, and a compound composed of a magnet powder having a size of 250 μm or less and a reaction curable resin is classified and taken out. (5) Compounding granules for compression molding are completed by adding and mixing a lubricant to the compound.

[0007]

However, the above conventional method has the following problems. B) In preparing the compound, the raw material alloy powder particles are further crushed due to the use of a kneading device such as a kneader having a large shear force, and fine powder is generated to change the particle size distribution of the magnet body powder. The particle size distribution also changes and the compression moldability decreases.

[0008] b) Rare earth alloys, especially Nd alloys, especially the fine powders described above, are very easily oxidized, and the oxides lower the magnetic properties of the bonded magnet after molding.

C) The conventional method requires 20 steps in the compounding process.
It takes a long time of up to 25 hours, and is a batch-type production, so that the production efficiency is low and the cost is high.

It is an object of the present invention to provide a compound manufacturing method which solves the above-mentioned problems of the prior art. In other words, in producing the compound, a fine powder is hardly generated by crushing the raw material alloy, the magnetic properties of the bonded magnet are good, and the compound granules for the rare earth bonded magnet which can be compounded in a short time are continuously manufactured. It is an object of the present invention to provide a manufacturing method that can be used.

[0011]

SUMMARY OF THE INVENTION A method of manufacturing a compound for a rare earth bonded magnet according to the present invention comprises a slurry manufacturing step of mixing a material containing a rare earth alloy magnet powder, a resin binder, and an organic solvent into a slurry, and A drying step of spraying the slurry with a spray dryer and instantaneously drying the slurry to form a compound is provided.

The magnet powder used for the rare earth bonded magnet has a particle diameter of 30 to 250 μm, and is larger than the particle diameter of the magnet powder used for the sintered magnet of 1 to 10 μm. Therefore, even when a slurry is formed by mixing with the resin component, the density of the magnet powder is high, so that the magnet powder immediately settles out. Therefore, it has been considered that the production of the compound by such a method is almost impossible. The present inventor has found that the object of the present invention can be achieved by supplying the slurry to the spray dryer within a short time after the production of the slurry, and has completed the present invention.

Since the kneading device having a high shearing force such as a kneader is not used in the production of the slurry, the particles of the magnet powder are not further crushed, and therefore, the fine powder magnet which is easily oxidized does not occur. Moreover, the compound is completed in a short time.

The continuous production of the compound can be carried out by continuously producing the slurry by continuously supplying and mixing the raw materials to a slurry producing apparatus, and supplying the slurry to a spray dryer. Also, two slurry production devices are installed, and while the slurry produced by one production device is being supplied to the spray dryer, the raw materials are weighed and mixed by another slurry production device to produce a slurry, and the supply path is established. It is also possible to supply the slurry to the spray dryer continuously by switching.

An organic solvent suitable for spray drying has a low dissolved oxygen concentration, unlike water, and is effective in preventing oxidative deterioration of the magnet powder. In addition, since ultrasonic waves can be easily applied to the organic solvent to remove air and remove dissolved air and moisture, the concentration of dissolved oxygen can be easily reduced and slurry production can be performed.

The above-mentioned resin binder is preferably a reaction-curable resin because the strength of the molded article is increased.

In the present invention, the slurry preferably has a magnet powder concentration of 15 to 50 vol% (58 to 90 wt%).

The magnet powder concentration is 15 vol% (58 wt.
%), The viscosity of the slurry is reduced, and the sedimentation of the magnet body is accelerated. As a result, the magnet body precipitates and accumulates in the pipe from the slurry manufacturing apparatus to the spray dryer and cannot be transferred at a uniform slurry concentration. . Conversely, if the concentration of the magnet powder exceeds 50 vol% (90 wt%), the concentration is too high and the fluidity of the slurry is reduced. Concentration transport becomes difficult.

The ratio of the binder resin raw material to the magnet powder is 100/1 to 1 by weight of the magnet powder / resin raw material.
It is preferably about 20/1. If the ratio of the magnet powder exceeds 100/1 and becomes too high, the ratio of the binder resin becomes low. As a result, the mechanical strength of the formed bonded magnet decreases, and if the binder becomes too large and exceeds 20/1. The magnetic properties of the molded bonded magnet are degraded, and it is no longer a practically satisfactory permanent magnet.

The organic solvent used in the present invention preferably contains a good solvent and a poor solvent for the reaction-curable resin. Particularly, the good solvent is at least one kind of a ketone solvent, and the poor solvent is an aromatic solvent. It is preferable to use at least one of an aromatic hydrocarbon or an alicyclic hydrocarbon.

By using such an organic solvent composition, fluidity is improved, and a compound more suitable for press molding is obtained. At the same time, when this compound is used, a press molded body having improved mechanical strength can be obtained. . Here, the poor solvent means not only a solvent which does not dissolve the reaction-curable resin at all, but also a solvent having a low solubility of the reaction-curable resin.

The composition of the organic solvent preferably has a good solvent / poor solvent weight ratio in the range of 70/30 to 10/90. If the amount of the good solvent is too large, a large amount of resin powder is generated during drying, and if the amount of the poor solvent is too large, the resin does not dissolve.

The hot air for drying the slurry is required to have a sufficiently high temperature to enable rapid drying, while not being so high that the reaction-curable resin does not cause a raw material curing reaction. Organic solvents that evaporate relatively slowly at room temperature have a boiling point of about 60 ° C. or higher, and the temperature at which the reaction-curable resin material rapidly cures is 150 ° C. or higher. It is preferable to set

The present invention also provides an apparatus for producing a compound for a rare-earth bonded magnet. This apparatus mixes a material containing at least a rare-earth alloy magnetic powder, a resin binder, and an organic solvent. At least one slurry manufacturing apparatus for forming a slurry, a spray drier disposed below the slurry manufacturing apparatus for atomizing and drying the slurry to obtain a compound for a rare earth bonded magnet, and transferring the slurry to the spray drier A transfer device that includes a slurry supply pipe and a pump, and the slurry supply pipe does not have a portion having an inclination angle of less than 45 degrees.

The manufacturing apparatus used in the present invention is particularly required to prevent agglomeration and sedimentation of the magnet powder in the slurry, so that the slurry manufacturing apparatus is installed above the spray dryer, and the slurry supply pipe is provided. Is 45
By configuring so as not to have a part below the degree,
The slurry is supplied to the spray dryer in a uniform state. The larger the inclination angle of the slurry supply pipe, the better,
It is more preferably at least 60 degrees, and most preferably perpendicular or close thereto.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION As the magnet body alloy powder used in the present invention, a magnet body containing a rare earth element can be used without limitation, but in particular, R-Fe-B alloy, R-Co alloy, The use of an R-Fe-N-based alloy powder is preferred. Examples of the alloy powder include a powder of an alloy having a predetermined composition, a known R-Fe-B alloy, and a powder of an R-Co alloy in which alloys of different compositions are mixed to have a predetermined composition after powdering. Any of these can be used. Further, as these powders, powders obtained by a known technique such as a dissolving / crushing method, a super-quenching method, a direct reduction diffusion method, a hydrogen-containing disintegration method, an atomizing method and the like can be used.

Examples of the binder resin used in the present invention include a resin having a vinyl bond such as an unsaturated polyester resin and a diallyl phthalate resin, which is cured by radical polymerization, a resin which is cured by a ring-opening polymerization reaction such as an epoxy resin, and a polyurethane. Examples of the resin include a resin that is cured by a polyaddition reaction such as a resin, and a resin that is cured by an addition reaction such as a phenolic resin. Can be used without any particular limitation.

As these resin raw materials, two-component types are generally used. That is, the radical polymerization resin is a combination of a radical polymerization initiator and a reactive resin raw material, the polyurethane resin is a combination of a polyisocyanate component and an active hydrogen group-containing component, and the phenol resin is a phenol group-containing component and formaldehyde such as hexamethylenetetramine. A combination with a generated component is used.

The combination of these resin components is selected from those which are relatively stable from room temperature to the drying temperature of the organic solvent in the spray drier, and which react and cure rapidly by heating after compound molding for the bonded magnet. Is preferred.

Among the above binder resins, those which polymerize by releasing low molecular compounds such as water and those which use a strong acidic substance as a curing agent or a catalyst have a strong tendency to corrode magnet alloy powder. Not preferred. In addition, the reaction curable resin raw materials exemplified above generally include a multi-component of a main agent mainly composed of a polymer serving as a base and a curing agent which reacts with a reactive functional group of a molecule constituting a catalyst or a resin. Ingredient type. These components are mixed at the time of use and, if necessary, heated to accelerate the reaction and cure, whereby a molded article is completed.

As a binder resin suitable for the bonded magnet of the present invention, an epoxy resin is particularly preferable. Examples of the epoxy resin that forms a high-strength cured product include a novolak-type epoxy resin and a bisphenol-based epoxy resin, all of which can be used. As the curing agent, an amine compound or an acid anhydride can be used, but in consideration of the influence on the magnet, it is more preferable to use an amine-based curing agent.

The mixing ratio of the epoxy resin and the curing agent is 40 /
About 1 to 4/1 is preferable. It is also a preferable embodiment to use a reaction catalyst such as a tertiary amino compound or an imidazole compound as necessary. These catalysts are preferably used after being added to an amine compound or the like as a curing agent component.

The above-mentioned reaction-curable resin has a relatively low molecular weight in the raw material stage because it has a high molecular weight by a polymerization reaction. Therefore, the viscosity of the slurry is low, which is disadvantageous for suppressing the sedimentation of the magnet powder. In order to prevent this, it is also a preferable embodiment to add a small amount of a high molecular compound to reduce the sedimentation speed of the magnet powder in the slurry.

As the organic solvent used in the present invention, when sprayed with a spray dryer,
Any compound which volatilizes rapidly with hot air of about 100 ° C. or less and forms a compound in a dry state and which dissolves the raw material binder resin well can be used without any particular limitation. Specifically, acetone, methyl ethyl ketone (M
Ketones such as EK), ethers such as tetrahydrofuran, dioxane, diethyl ether and diisobutyl ether; aromatic compounds such as toluene, xylene (o-, m- and p-isomers or mixtures thereof);
Esters such as ethyl acetate, propyl acetate and butyl acetate; aliphatic hydrocarbons such as hexane, pentane and octane; alicyclic hydrocarbons such as cyclohexane, tetralin and decalin; halogenated hydrocarbons such as dichloroethane; methyl cellosolve acetate And alcohols such as methanol, ethanol, propanol and methyl cellosolve. These organic solvents are selected in consideration of the compatibility with the binder resin to be used, the effect on the curing reaction, and the like.

It is also a preferred embodiment to use a mixture of a plurality of kinds of the above-mentioned organic solvents. In particular, it is preferable to use a solvent containing a good solvent and a poor solvent for the reaction-curable resin as described above. The reason for this is not clear, but when only a good solvent is used, the reaction-curable resin molecules exist in a state of being suspended in the solvent, whereas when a poor solvent is used in combination, the solubility of the reaction-curable resin decreases. It is presumed that this is because the reaction-curable resin molecules form a state that covers the surface of the magnetic material. As a result, it is considered that the amount of the organic component present in the compound is increased, the fluidity of the compound is improved, and at the same time, the mechanical strength of a press-formed product using the compound is improved.

Examples of good solvents for the reaction curable resin include ketones such as acetone and methyl ethyl ketone (MEK) and esters such as tetrahydrofuran, ethyl acetate, propyl acetate and butyl acetate. Examples of the poor solvent for the reaction curable resin include aromatic hydrocarbons such as toluene, xylene (o-, m-, and p-isomers and mixtures thereof), ethylbenzene and the like; and aliphatic hydrocarbons such as hexane, pentane and octane. And cycloaliphatic hydrocarbons such as cyclohexane, tetralin and decalin.

The solubility of the reaction-curable resin varies depending on the organic solvent, and even a single solvent having the same dissolution behavior of the reaction-curable resin as the mixed solvent of the present invention. Can be used alone as a suitable organic solvent.

In producing the compound, in addition to the above-mentioned raw materials, a polyhydric alcohol such as glycerin,
One or more dispersants and lubricants such as wax, stearic acid, metal stearate (eg, zinc stearate, calcium stearate, magnesium stearate, etc.), and phthalic acid esters; It is also a preferred embodiment to add a foaming agent. The use of additives such as dispersants, lubricants and defoamers improves the dispersibility of the magnet powder in the slurry, improves the uniformity, improves the powdered state in the spray dryer, and generates foam. As a result, the production process becomes stable.

An example of an apparatus used in the manufacturing method of the present invention will be described with reference to the drawings. FIG. 1 schematically shows an apparatus for producing a compound for a rare-earth bonded magnet according to the present invention.

This apparatus is largely composed of a slurry manufacturing apparatus, a spray drier, a hot air generator for sending hot air for drying to the spray drier, and a dust removing / exhausting apparatus. The rare earth-based alloy magnet powder, the reaction curable resin raw material, and the raw material containing the organic solvent are uniformly mixed and stirred in the slurry manufacturing apparatus 1 provided with the stirrer 2, and the slurry is supplied through the slurry supply pipe 4 via the fixed supply pump 3. It is sent to the spray dryer S. In the example shown in FIG. 1, two slurry manufacturing apparatuses 1A and 1B are provided, and the slurry is manufactured by a batch method in each of the slurry manufacturing apparatuses. And the compound is configured to be continuously manufactured.

Each of the two slurry production apparatuses 1A and 1B is installed above the spray dryer S, and is configured to supply the slurry to the atomizer 5 of the spray dryer S via the slurry supply pipe 4 and the pump 3. Have been. While the slurry is being supplied from one slurry production device, the slurry can be supplied continuously by producing the slurry with the other slurry production device. In another preferred embodiment, a pipe for supplying a cleaning solvent is provided. The inclination angle of the slurry supply pipe is indicated by α in FIG. If the slurry supply pipe is curved, at least 4
Preferably, it is 5 degrees.

The spray dryer S has an atomizer (atomizer) 5 composed of a disk 7 driven by a motor 6 above a container 9, a hot air supply pipe 15, and an exhaust pipe 1.
6, and a compound discharge port 8 made of a rare earth alloy magnet powder and a reaction-curable resin raw material.
And is atomized in the horizontal direction and instantaneously dried by hot air.

FIG. 2 shows an example of a compound manufacturing apparatus for a rare earth bonded magnet according to the present invention, which is provided with one slurry manufacturing apparatus.

The rotational speed of the disk is not particularly limited as long as the atomization state is good. Generally 3,000 to 15,
It is about 000 rpm. The obtained compound is further added to and mixed with a metal stearate lubricant such as calcium stearate and then subjected to molding.

The spray dryer S is appropriately set in accordance with the production capacity.
It is preferably about 00 mm. If it is too small, the slurry atomized by the atomizer does not dry sufficiently and reaches the vessel wall.

There are various types of spray dryers including an atomizer, but any type can be used without particular limitation as long as the atomization and drying conditions are good. Considering that it is necessary to atomize a slurry of a magnet powder of a rare earth alloy magnet powder having a particle diameter of 30 to 250 μm before the sedimentation of the magnet powder, as described above, A rotary disk type spray drier having a disk-shaped disk that rotates at a constant speed is particularly suitable.

Known rotary disk atomizers are classified into vane type, Kessner type, pin type, etc. depending on the shape of the slurry ejection port, and any of them can be used without particular limitation.

The rotating disk of the atomizer is preferably made of stainless steel, ceramic or the like, and generally has a diameter of about 50 to 200 mm. In a preferred embodiment, the disc is provided with various shapes of rods for improving the drying efficiency.

The hot air sucks drying gas through a filter 11 by an air supply fan 12, heats the gas by a heat exchanger 13 such as an electric heater or a steam heater, and further removes dust by a hot air filter 14 to remove hot air. 1
5 to the spray dryer.

The exhaust gas after drying contains fine powder of only resin and fine powder of alloy magnet body mixed from the beginning. After being discharged from the exhaust pipe 16, the cyclone type dust remover 17 and the bag behind it are removed. The dust is sufficiently removed by the filter 18 and is preferably discharged through the silencer 20. It is also a suitable embodiment to provide an organic solvent recovery / removal device and use it circulating.

The gas used for drying is preferably an inert gas in order to prevent the oxidation of the magnet body.
Particularly, use of nitrogen and argon is preferred.

The outline of the flowchart of the process of the present invention is as follows.
FIG. 3 shows a comparison with the conventional kneading method. The conventional method requires kneading with a kneader or the like, and inevitably requires batch processing. On the other hand, it is understood that the process of the present invention has few steps and that continuous production is possible. The classification of the raw material magnet powder and the steps after the classification of the compound are common to both the present invention and the prior art.

[0053]

EXAMPLES Specific examples of the present invention will be described based on the following examples. (Examples 1 to 6) The rare earth alloy powder was used after adjusting the particle size to 30 to 200 µm, and a bisphenol-based epoxy resin was used as the reaction curable resin. As the organic solvent, methyl ethyl ketone (MEK) was used as a good solvent, and toluene and xylene were used as poor solvents. The solvent composition is shown in the upper column of Table 1.

An epoxy resin was blended with the rare earth alloy powder in an amount of 3.0% by weight, an organic solvent was blended so that the slurry concentration became 20 vol%, and a slurry containing the rare earth alloy magnetic powder and the reaction hardening resin was prepared. The mixture was supplied to a spray drier and spray-dried to prepare a compound.

(Comparative Example) A compound was prepared in the same manner as in Example except that only MEK was used as the organic solvent.

(Evaluation) (1) Carbon Content of Compound The amount of the organic substance such as the reaction curable resin contained in the compound was evaluated based on the carbon content measured by EPMA. The carbon content by EPMA was measured from the distribution state of carbon at a magnification of 80 times and 400 times.

The results are shown in the lower part of Table 1. From these results, it was found that MEK alone was used as the organic solvent,
It can be seen that the mixed solvent system has a higher carbon content.

(2) Flowability of Compound The flowability was measured as an evaluation of the flowability of the compound. The time (sec / 50 g) at which 50 g of the sample flowed down from the funnel having an orifice having a diameter of 2.6 mm was defined as the fluidity of the compound. The measurement was performed three times for each sample,
The measurement results are shown in the lower part of Table 1.

As a result, the mixed solvent system has a higher fluidity than the case where MEK is used alone as the organic solvent,
It can be seen that a compound having fluidity suitable for press molding can be obtained.

(3) Mechanical Strength of Press-Formed Product The obtained compound was subjected to pressure of 8 Ton / cm ^{2 at} a pressure of 8.1 mm, 3.3 mm in width and 40.3 mm in length. This was produced. Each sample was supported at a distance between fulcrums of 25 mm, and the bending strength (flexural strength) was measured by applying a load to the center with the horizontal (3.3 mm) as the height direction.

The results of measuring the transverse rupture strength are shown in the lower part of Table 1 together with the results of the above (1) and (2). From these results, it is apparent that a compound having a higher strength of the molded body can be obtained when the mixed solvent system is subjected to press molding than when MEK is used alone as the organic solvent.

[0062]

[Table 1] As described above, the compound for the rare-earth bonded magnet obtained by using the mixed solvent system has a large content of the reaction curable resin, and as a result, the compound has excellent fluidity, and the mechanical properties when formed into a press-formed body It can be seen that the compound gives a molded product with high strength.

(Examples 7 to 13, Comparative Examples 2 to 6) The same rare earth alloy powder and reaction curable resin as in Examples 1 to 6 were used, and the organic solvent was methyl ethyl ketone (M
EK) and xylene as a poor solvent in toluene / xylene = 50/50.

In Examples 7 to 9 and Comparative Examples 2 and 3,
The slurry concentration was fixed at 20 vol%, and the blending amount of the epoxy resin as the reaction-curable resin with respect to the rare earth alloy powder was varied in the range of 0.5 to 7% by weight to prepare a slurry.

In Examples 10 to 13 and Comparative Examples 4 and 5, the amount of the epoxy resin, which is a reaction curable resin, was 3% by weight with respect to the rare earth alloy powder, and the slurry concentration was in the range of 5 to 60% by volume. The amount was varied to produce a slurry.

Each of the slurries was supplied to a spray drier and spray dried to prepare a compound. Then, the supply property of the slurry, the drying property of the recovered raw material compound, and the degree of resin adhesion on the surface of the rare earth alloy powder were evaluated.

For the compounds obtained in Examples 7, 8, 9 and Comparative Examples 2 and 3, the magnetic properties of the molded magnets were measured. The results are shown in Table 2.

[0068]

[Table 2] From the results in Table 2, it is understood that the compounding amount of the resin binder to the magnet powder is preferably in the range of 1 to 5% by weight, and the slurry concentration is preferably in the range of 15 to 50% by volume.

[0069]

According to the present invention, a magnet powder having a particle diameter of 30 to 250 μm, which is larger than that for a sintered magnet, is less likely to produce fine powder due to crushing of a raw material alloy, and is continuously performed in a short time. A compound for a rare-earth bonded magnet comprising a rare-earth alloy magnet powder and a reaction-curable resin can be obtained. In addition, by using a good solvent and a poor solvent of the reaction curable resin in combination as an organic solvent, a compound having excellent fluidity can be obtained, and the mechanical strength of a press-formed product using the compound can be improved. .

[Brief description of the drawings]

FIG. 1 is a view showing an example of a manufacturing apparatus suitable for manufacturing a compound for a rare earth bonded magnet of the present invention.

FIG. 2 is a view showing another embodiment of a manufacturing apparatus suitable for manufacturing a compound for a rare earth bonded magnet of the present invention.

FIG. 3 is a process flowchart showing a manufacturing process of a compound for a rare earth bonded magnet of the present invention in comparison with a conventional method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Slurry manufacturing apparatus 3 Pump 4 Slurry supply piping 5 Spray dryer

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shin Mishima 2-15-17 Egawa, Shimamoto-cho, Mishima-gun, Osaka Prefecture Inside Yamazaki Works, Sumitomo Special Metals Co., Ltd. (72) Inventor Shinji Otsuki Egawa, Shimamoto-cho, Mishima-gun, Osaka 2-15-17 Sumitomo Special Metals Co., Ltd. Yamazaki Works (72) Inventor Yoshihiko Nishino 2-15-17 Egawa Shimamoto-cho, Mishima-gun, Osaka Sumitomo Special Metals Co., Ltd. Yamazaki Works

Claims (7)

[Claims] A slurry mixing step of mixing a material containing a rare earth alloy magnetic powder, a resin binder, and an organic solvent to form a slurry, and spraying and drying the slurry with a spray drier to obtain a rare earth alloy magnetic material. A method for producing a compound for a rare earth bonded magnet, comprising a drying step of forming a compound comprising a body powder and a resin binder. 2. The method according to claim 1, wherein the resin binder is a reaction-curable resin binder. 3. The slurry has a magnetic powder concentration of 15 to 5
The method for producing a compound for a rare-earth bonded magnet according to claim 1 or 2, which is 0 vol%. 4. The method for producing a compound for a rare earth bonded magnet according to claim 1, wherein said organic solvent contains a good solvent and a poor solvent for said curable resin. 5. The method according to claim 4, wherein the ratio of the good solvent to the poor solvent is 70/30 to 10/90 in terms of a good solvent / poor solvent weight ratio. 6. The rare-earth bonded magnet according to claim 4, wherein said good solvent is at least one kind of ketone solvent, and said poor solvent is at least one kind of aromatic hydrocarbon or alicyclic hydrocarbon. Manufacturing method of compound for medical use. 7. An apparatus for producing a compound for a rare earth bonded magnet, comprising at least a rare earth alloy magnetic powder, a resin binder,
At least one slurry manufacturing apparatus for mixing a material containing an organic solvent and a slurry, the spray dryer being disposed below the slurry manufacturing apparatus, atomizing and drying the slurry to form a compound for a rare-earth bonded magnet And a transfer device for transferring the slurry to the spray dryer, wherein the transfer device includes a slurry supply pipe and a pump, and the slurry supply pipe has an inclination angle of 45.
An apparatus for producing a compound for a rare-earth bonded magnet, wherein the compound has no portion having a degree of less than 10 degrees.