JP2003068511A - Composition for resin bond type magnet and method for manufacturing resin bond type magnet using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composition for a resin bond type magnet which has superior magnetic characteristics, can be formed into any shape, and has a good anti-corrosion property, good moldability, high mechanical strength, flexibility, good heat-resistance, and the like, and also to provide a method for manufacturing a resin bond-type magnet using the same. SOLUTION: In the composition for a resin bond type magnet containing magnetic powder (A) and a resin binder (B), the resin binder (B) is a hardener reactive type silicone rubber-based binder having a dynamic viscosity of 500 Pa.s or below, and the magnetic powder (A) is coated with at least one kind of chemical compound selected from an abietic acid compound (C1) or an alkoxysilane monomer (C2).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin-bonded magnet composition and a method for producing a resin-bonded magnet using the same, and more specifically, it has good magnetic properties, has a high degree of freedom in shape, and is durable. Rust characteristics, formability, mechanical strength, flexibility,
The present invention relates to a resin-bonded magnet composition having excellent heat resistance and a method for producing a resin-bonded magnet using the composition.

[0002]

2. Description of the Related Art In recent years, ferrite magnets, alnico magnets,
Rare earth magnets are incorporated and used as motors in various products such as general home appliances, communication / audio equipment, medical equipment, and general industrial equipment. These magnets are mainly manufactured by a sintering method, but are difficult to form into a complicated shape because they are brittle and are hard to be thinned.
Since it shrinks by up to 20%, the dimensional accuracy cannot be improved, and post-processing such as polishing is required, which is a major limitation in terms of application. On the other hand, resin-bonded magnets (also called bonded magnets) can be easily manufactured by filling magnetic powder with a thermoplastic resin such as polyamide resin or polyphenylene sulfide resin as a binder, so new applications are being developed. There is. However, since it is subjected to severe shearing during the manufacturing process, a new surface is likely to appear in the magnet powder, and particularly in the case of rare earth magnet materials containing iron element, it is said that the rust property is extremely poor under salt water.

A resin-bonded magnet using a thermosetting resin such as an epoxy resin or a bis-maleimidetriazine resin as a resin binder is also known. Japanese Patent Laid-Open No. 1-11
No. 4006 proposes a method of coating a rare earth resin-bonded magnet with a triazine derivative, dibutylaminotriazinediotil, which improves the rust-preventing effect, but has a moldability and flexibility required for a bonded magnet. The characteristics such as sex were not sufficient. For binders with weak binding strength,
Even in a fresh water environment, it easily rusts, and since only a simple molded product can be manufactured by compression molding, and its mechanical strength is low, it is essential to coat the molded body to prevent powder falling and rust.

Japanese Unexamined Patent Publication (Kokai) No. 5-129148 discloses that after the surface of a magnet is subjected to electrolytic polishing treatment or electrolytic composite polishing treatment,
A method for forming an inorganic anticorrosion coating such as metal plating or an organic anticorrosion coating such as a polymer has been proposed, and is also disclosed in Japanese Patent Laid-Open No.
No. 0-226890 proposes a method of attaching scale-like aluminum powder to the surface of a rare earth magnet by barrel treatment. According to these, a certain rust preventive effect can be obtained, but there is no description about the formability into a resin-bonded magnet. On the other hand, in JP-A-11-11801, a monocarboxylic acid such as butyric acid or caproic acid, or a reaction product of a monocarboxylic acid and a polyhydric alcohol,
A method of coating the surface of a rare earth magnet to improve its oxidation resistance, storage stability, etc. has been proposed. This way too
Although it can be expected to improve rust prevention, it does not mention application to resin-bonded magnets. Furthermore, JP-A-7-2632
In Japanese Patent Laid-Open No. 65-65, a method is proposed in which a hydrocarbon lubricating oil is added to a silicone oil, and this is mixed as an oxidation inhibitor with a coarse powder of a rare earth intermetallic compound permanent magnet alloy. Is not disclosed. Further, JP-A No. 11-67513 proposes a rare earth bonded magnet having a binder made of a resin obtained by mixing an epoxy resin and a silicone resin.
Although it may improve the mechanical strength, it does not mention the rust resistance of the magnet powder.

In recent years, resin-bonded magnets for small motors, audio equipment, and OA equipment have become smaller as the equipment becomes smaller.
There is a strong demand for a composition for magnets that has excellent magnetic properties and a high degree of freedom in shape, but there is no conventional resin-bonded magnet that satisfies both of these conditions, and it is a rare-earth resin-bonded magnet that does not rust easily. The advent of magnet compositions has been eagerly awaited.

[0006]

SUMMARY OF THE INVENTION In view of the above-mentioned problems of the prior art, the object of the present invention is to provide good magnetic properties, flexibility in shape, and rust resistance, formability, mechanical strength,
It is an object of the present invention to provide a resin-bonded magnet composition having excellent flexibility and heat resistance, and a method for producing a resin-bonded magnet using the composition.

[0007]

Means for Solving the Problems As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that in a resin-bonded magnet composition containing a magnetic powder (A) and a resin binder (B). A silicone rubber having a specific dynamic viscosity is used as the resin binder (B), and the magnetic powder (A) is mixed with a compound (C1) or (C) having a specific structure.
When coated with at least one of 2), the composition for resin-bonded magnet has good magnetic properties, flexibility in shape, and excellent rust resistance, moldability, mechanical strength, flexibility, and heat resistance. The present invention has been completed and the present invention has been completed.

That is, according to the first aspect of the present invention, in the resin-bonded magnet composition containing the magnetic powder (A) and the resin binder (B), the resin binder (B) has a dynamic viscosity of 500 Pa. s or less of a curing reaction type silicone rubber binder, and the magnetic powder (A) is coated with at least one compound selected from an abietic acid compound (C1) or an alkoxysilane monomer (C2). A composition for a resin-bonded magnet, characterized by the above.

According to the second aspect of the present invention, the first aspect
Of the invention, the anisotropic magnetic field (HA) of the magnetic powder (A)
Is 50 kOe or more, and a composition for a resin-bonded magnet is provided.

According to a third aspect of the present invention, the first aspect
In the invention, there is provided a resin-bonded magnet composition, wherein the magnetic powder (A) contains magnetic powder having a particle diameter of 100 μm or less in an amount of 30% by weight or more based on the total amount of the magnetic powder (A). .

According to a fourth aspect of the present invention, the first aspect
3 to 3, the magnetic powder (A) is rare earth-iron-
Provided is a composition for a resin-bonded magnet, which is nitrogen-based.

According to a fifth aspect of the present invention, the first aspect
In the invention, there is provided a resin-bonded magnet composition, wherein the resin binder (B) is a two-component thermosetting silicone rubber.

According to a sixth aspect of the present invention, the first aspect
In the invention described above, the resin binder (B) is a linear, branched or crosslinked thermosetting silicone rubber having a polysiloxane bond in the main skeleton thereof, which is a resin-bonded magnet composition. Provided.

According to a seventh aspect of the present invention, the first aspect
In the invention, the abietic acid compound (C1) is at least one compound selected from abietic acid represented by the following general formula (1), isomers thereof, or derivatives thereof. A composition for a bonded magnet is provided. C ₁₉ H _n COOH (1) (In the formula, n is an integer of 25 or more and 33 or less.)

According to an eighth aspect of the present invention, the first aspect
In the invention, the alkoxysilane-based monomer (C2)
Is a compound represented by the following general formula (2), which provides a resin-bonded magnet composition. R _(4-n) -Si-X _(n) (2) (In the formula, R is a linear, branched or cyclic alkyl group, or an alkyl group having an oxygen-containing, nitrogen-containing or sulfur-containing substituent. In any of the above, X represents a hydrolyzable group, and n is an integer less than 4.)

Further, according to the ninth invention of the present invention, in the first invention, the content of the abietic acid compound (C1) or the alkoxysilane monomer (C2) is higher than that of the magnetic powder (A). And 0.01 to 10% by weight, respectively, of a resin-bonded magnet composition.

On the other hand, according to the tenth invention of the present invention, in the first to ninth inventions, the resin-bonded magnet composition is selected from an injection molding method, a compression molding method, an extrusion molding method or a roll molding method. There is provided a method for producing a resin-bonded magnet that is molded by any of the molding methods described above.

According to the eleventh aspect of the present invention, in the tenth aspect, when the resin-bonded magnet composition is injection-molded, the composition is formed under the condition that the maximum hysteresis temperature is 200 ° C. or lower. A method for producing a resin-bonded magnet is provided.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION The composition for resin-bonded magnet of the present invention and the method for producing a resin-bonded magnet using the same will be described in detail below.

1. Composition A for Resin-Coupled Magnets Magnetic Powder As the magnetic powder, various magnetic powders that are usually used as raw materials for resin-bonded magnets such as rare earth magnetic powder, ferrite, and alnico can be used, and are not particularly limited. These may be a mixture (hybrid), and not only anisotropic magnetic powders but also isotropic magnetic powders are targeted, but an anisotropic magnetic field (HA) is 50
A magnetic powder of kOe or more is preferable. Also, the particle size is 100
30 wt% or more, especially 50 wt% of magnet powder of μm or less
The magnetic powder containing the above is preferable.

Rare earth-transition metal type, for example, rare earth cobalt type, rare earth-iron-boron type, rare earth-iron-nitrogen type magnetic powder and the like can be used. Among them, rare earth-iron-nitrogen type magnetic powder is preferable. is there. Sm, N as rare earth elements
Examples thereof include d, Pr, Y, La, Ce and Gd, which can be used alone or as a mixture. Among these, especially Sm or Nd is 5-40 at. %, Fe 50 to 90a
t. % Content is preferable.

B Resin Binder The resin binder of the present invention is a component that acts as a binder for magnetic powder, and employs a curing reaction type silicone rubber which is one type of thermosetting resin. There is no particular limitation as long as it is a curing reaction type silicone rubber, and commercially available liquid silicone rubber can be used. The liquid silicone rubber is advantageously a two-pack type from the viewpoints of handleability and pot life, and after mixing the two packs, one that can be cured at a temperature from room temperature to 200 ° C. is preferable. The reaction mechanism may be a general addition polymerization type or polycondensation type.
Further, crosslinking reaction type monomers and oligomers such as peroxides may be added if necessary.

The curing reaction type silicone rubber is preferably a linear, branched or crosslinked organopolysiloxane rubber binder having a polysiloxane bond in its main chain, such as polydimethylpolysiloxane,
Polydiethylpolysiloxane, polymethylethylpolysiloxane, polydipropylpolysiloxane, a part or all of the alkyl group which is a side chain of these, with a vinyl group and / or a phenyl group, and / or fluorine, and / or hydrogen. Examples include those that have been replaced.

These are not restricted by polymerization degree and molecular weight as long as they are in a reactive state, but in a final mixed state with a curing agent, other additives, etc., dynamics at 150 ° C. measured by an ASTM 100 type rheometer. The viscosity must be 500 Pa · s or less. Preferably 400 Pa · s or less,
Particularly preferably, it is 100 to 300 Pa · s. If the dynamic viscosity is 500 Pa · s or more, a remarkable increase in kneading torque at the time of molding and a decrease in fluidity are caused, which makes molding difficult, which is not preferable. On the other hand, if the dynamic viscosity becomes too small, the magnetic powder and the binder are likely to separate during molding, so 0.5 Pa · s or more is desirable.

The shape is not particularly limited and may be liquid, powder, beads, pellets or the like, but it is preferably liquid at room temperature from the viewpoint of uniform mixing with magnetic powder and moldability. Further, two or more kinds of resins having different molecular weights and properties can be combined with these resins, and the dynamic viscosity after mixing can be used within the above range. The curing reaction type silicone rubber binder is added in a proportion of 3 to 50 parts by weight with respect to 100 parts by weight of the magnetic powder. The addition amount is preferably 7 to 30 parts by weight, and more preferably 10 to 20 parts by weight. When the amount is less than 3 parts by weight, the kneading torque is remarkably increased and the fluidity is deteriorated, which makes it difficult to perform molding. On the other hand, when the amount is 50 parts by weight or more,
It is not preferable because desired magnetic properties cannot be obtained.

C1 Abietic Acid Compound The magnetic powder surface-treated with a phosphoric acid compound is then coated with abietic acid represented by the general formula (1), its isomer or a derivative thereof. C ₁₉ H _n COOH (1) (In the formula, n is an integer of 25 or more and 33 or less.)

Examples of these compounds include diterpenes such as abietic acid, neoabietic acid, levopimaric acid, valstophosphoric acid, dehydroabietic acid, dihydroabietic acid, tetraabietic acid, dextropimaric acid and isodextropimaric acid. Resin acids, and their water additives, disproportionated products, polymers such as esterified products with phenols and alcohols, maleated products,
Examples include reaction products with metal ions. These resin acids and various compounds thereof are generally referred to as rosin, and are, for example, manufactured by Arakawa Chemical Industry Co., Ltd. under the trade names of “Super Ester A-100”, “Ester Gum AAG”, and “Marquide No. 2”. It is commercially available. When the magnetic powder is coated with the abietic acid compound by a wet treatment method or a dry treatment method, a magnetic powder having stable performance can be obtained.

The abietic acid compound is added to an organic solvent such as ethanol (1 to 20 parts by weight based on 100 parts by weight of magnetic powder) and dissolved to form a coating solution. The amount of the abietic acid compound added is 0.01 to 1 with respect to the magnetic powder.
5% by weight. 0.05 to 10% by weight, further 0.1
~ 7 wt% is preferred. If the added amount is less than 0.01% by weight, the rust resistance effect is not sufficient, and if the added amount exceeds 10% by weight, the density of the magnetic powder decreases, and the magnetic properties and mechanical strength also decrease.

The coating solution and the magnetic powder are sufficiently mixed and stirred by a planetary mixer or the like (for example, 40 rp).
m, 20 ° C, holding / stirring time 20 minutes), and finally 1
Dry in a vacuum oven at 00 to 150 ° C. for 10 to 30 hours to coat the magnetic powder. Abietic acid compounds,
The reason why the magnetic powder can be suitably coated has not yet been completely clarified, but the general formula (3)
It is presumed that this is due to the polycyclic hydrocarbon structure containing a double bond as described above and the unique three-dimensional structure of abietic acid having one carboxyl group.

[0030]

[Chemical 1]

The C2 alkoxysilane monomer magnetic powder may be coated with an alkoxysilane monomer instead of the abietic acid compound. This alkoxysilane-based monomer is a silane containing 1 to 3 hydrolyzable groups, that is, alkoxy groups and 1 to 3 alkyl groups, as represented by the general formula (2). R _(4-n) -Si-X _(n) (2) (In the formula, R is a linear, branched or cyclic alkyl group, or an alkyl group having an oxygen-containing, nitrogen-containing or sulfur-containing substituent. In any of the above, X represents a hydrolyzable group, and n is an integer less than 4.)

Examples of the alkoxy group include methoxy, ethoxy, propoxy and the like. As the alkyl group, if it has 1 to 15 carbon atoms, not only a straight chain but a branched chain,
It may contain a cyclic cyclohexyl ring, a vinyl group or a benzyl group. Particularly preferred is dimethoxysilane or trimethoxysilane having 1 or 2 alkyl groups having 1 to 10 carbon atoms. The alkyl group having an oxygen-containing, nitrogen-containing or sulfur-containing substituent includes methacryloxyalkyl, epoxyalkyl, glycidoxyalkyl, aminoalkyl, mercaptoalkyl and the like.

Specific examples of the alkoxysilane monomers include methyltrimethoxysilane, ethyltrimethoxysilane, propyltrimethoxysilane, butyltrimethoxysilane, hexyltrimethoxysilane, octyltrimethoxysilane, heptyltrimethoxysilane, n-
Decyltrimethoxysilane, vinyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane,
β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, N-β- (aminoethyl) γ-aminopropyltrimethoxysilane, γ-aminopropyltrimethoxysilane, N -Phenyl-γ-aminopropyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, benzyltrimethoxysilane, methyltriethoxysilane, ethyltriethoxysilane, propyltriethoxysilane, butyltriethoxysilane, hexyltrimethoxysilane, octyl Triethoxysilane, heptyltriethoxysilane, n-decyltriethoxysilane, vinyltriethoxysilane, γ-methacryloxypropyltriethoxysilane, β- (3,4-epoxycyclohexyl) ethyltrie Kishishiran, .gamma.-glycidoxypropyl triethoxysilane, N-β- (aminoethyl) .gamma.-aminopropyltriethoxysilane, .gamma.
Aminopropyltriethoxysilane, N-phenyl-γ
-Aminopropyltriethoxysilane, γ-mercaptopropyltriethoxysilane, benzyltriethoxysilane, and other trialkoxysilane-based monomers; dimethyldimethoxysilane, methylethyldimethoxysilane, methylpropyldimethoxysilane, methylbutyldimethoxysilane, ethylpropyldimethoxysilane. , Ethylbutyldimethoxysilane, diethyldimethoxysilane, ethylpropyldimethoxysilane, ethylbutyldimethoxysilane, ethylheptyldimethoxysilane, ethylhexyldimethoxysilane, ethyloctyldimethoxysilane, dipropyldimethoxysilane, propylbutyldimethoxysilane, propylhexyldimethoxysilane, propyl Heptyldimethoxysilane, propyloctyldimethoxysilane, Tylpentyldimethoxysilane, butylhexyldimethoxysilane, butylheptyldimethoxysilane, dihexyldimethoxysilane, hexyloctyldimethoxysilane, hexyldecyldimethoxysilane, dioctyldimethoxysilane, diheptyldimethoxysilane, didecyldimethoxysilane, divinyldimethoxysilane, γ- Methacryloxypropylmethyldimethoxysilane, γ-methacryloxypropylethyldimethoxysilane, γ-methacryloxypropylbutyldimethoxysilane, β- (3,4-epoxycyclohexyl) ethylmethyldimethoxysilane, β- (3,4-epoxycyclohexyl) Ethylpropyldimethoxysilane, β- (3,4-epoxycyclohexyl) ethylethyldimethoxysilane, γ-methacryloxy Ropylmethyldimethoxysilane, γ-methacryloxypropylethyldimethoxysilane, γ-methacryloxypropylpropyldimethoxysilane, γ-glycidoxypropylmethyldimethoxysilane, γ-glycidoxypropylethyldimethoxysilane, γ-glycidoxypropyl Propyldimethoxysilane, N-β- (aminoethyl) γ-aminopropylmethyldimethoxysilane, N-β- (aminoethyl) γ-aminopropylethyldimethoxysilane, N-β- (aminoethyl) γ-aminopropylpropyldimethoxy Silane, γ-aminopropylmethyldimethoxysilane, γ-aminopropylethyldimethoxysilane, γ-aminopropylpropyldimethoxysilane,
N-phenyl-γ-aminopropylmethyldimethoxysilane, N-phenyl-γ-aminopropylethyldimethoxysilane, N-phenyl-γ-aminopropylpropyldimethoxysilane, γ-mercaptopropylmethyldimethoxysilane, benzylmethyldimethoxysilane, dimethyl Diethoxysilane, methylethyldiethoxysilane, methylpropyldiethoxysilane, methylbutyldiethoxysilane, ethylpropyldiethoxysilane, ethylbutyldiethoxysilane, diethyldiethoxysilane, ethylpropyldiethoxysilane, ethylbutyldiethoxysilane , Ethylheptyldiethoxysilane, ethylhexyldiethoxysilane, ethyloctyldiethoxysilane, dipropyldiethoxysilane, propylbutyldiethoxysilane , Propylhexyldiethoxysilane, propylheptyldiethoxysilane, propyloctyldiethoxysilane, butylpentyldiethoxysilane, butylhexyldiethoxysilane, butylheptyldiethoxysilane, dihexyldiethoxysilane, hexyloctyldiethoxysilane, hexyldecyl Diethoxysilane, dioctyldiethoxysilane, diheptyldiethoxysilane, didecyldiethoxysilane, divinyldiethoxysilane, γ-methacryloxypropylmethyldiethoxysilane, γ-methacryloxypropylethyldiethoxysilane, γ-methacryl Roxypropylbutyldiethoxysilane, β- (3,4-epoxycyclohexyl) ethylmethyldiethoxysilane, β- (3,
4-epoxycyclohexyl) ethylpropyldiethoxysilane, β- (3,4-epoxycyclohexyl) ethylethyldiethoxysilane, γ-methacryloxypropylmethyldiethoxysilane, γ-methacryloxypropylethyldiethoxysilane, γ-methacryl Roxypropylpropyldiethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, γ-glycidoxypropylethyldiethoxysilane, γ-glycidoxypropylpropyldiethoxysilane, N-β- (aminoethyl)
γ-aminopropylmethyldiethoxysilane, N-β-
(Aminoethyl) γ-aminopropylethyldiethoxysilane, N-β- (aminoethyl) γ-aminopropylpropyldiethoxysilane, γ-aminopropylmethyldiethoxysilane, γ-aminopropylethyldiethoxysilane, γ- Aminopropylpropyldiethoxysilane, N-phenyl-γ-aminopropylmethyldiethoxysilane, N-phenyl-γ-aminopropylethyldiethoxysilane, N-phenyl-γ-aminopropylpropyldiethoxysilane, γ-mercaptopropyl Dialkoxysilane-based monomers such as methyldiethoxysilane and benzylmethyldiethoxysilane; trimethylmethoxysilane, dimethylethylmethoxysilane, dimethylpropylmethoxysilane, dimethylbutylmethoxysilane, diethylpropylmetho Shishiran, diethyl butyl methoxysilane, triethyl silane, diethyl propyl silane, diethyl butyl methoxysilane, diethyl heptyl silane, diethyl hexyl silane, diethyl octyl silane,
Tripropylmethoxysilane, dipropylbutylmethoxysilane, dipropylhexylmethoxysilane, dipropylheptylmethoxysilane, dipropyloctylmethoxysilane, dibutylpentylmethoxysilane, dibutylhexylmethoxysilane, dibutylheptylmethoxysilane, trihexylmethoxysilane, dihexyl Octylmethoxysilane, dihexyldecylmethoxysilane, trioctylmethoxysilane, triheptylmethoxysilane, tridecylmethoxysilane, trivinylmethoxysilane, γ-methacryloxydipropylmethylmethoxysilane, γ-methacryloxypropyldiethylmethoxysilane, γ -Methacryloxypropyldibutylmethoxysilane, β- (3,4-epoxycyclohexyl)
Ethyldimethylmethoxysilane, β- (3,4-epoxycyclohexyl) ethyldipropylmethoxysilane,
β- (3,4-epoxycyclohexyl) ethyldiethylmethoxysilane, γ-methacryloxypropyldimethylmethoxysilane, γ-methacryloxypropyldiethylmethoxysilane, γ-methacryloxypropyldipropylmethoxysilane, γ-glycidoxypropyldimethyl Methoxysilane, γ-glycidoxypropyldiethylmethoxysilane, γ-glycidoxypropyldipropylmethoxysilane, N-β- (aminoethyl) γ-aminopropyldimethylmethoxysilane, N-β- (aminoethyl) γ- Aminopropyldiethylmethoxysilane, N
-Β- (aminoethyl) γ-aminopropyldipropylmethoxysilane, γ-aminopropyldimethylmethoxysilane, γ-aminopropyldiethylmethoxysilane,
γ-aminopropyldipropylmethoxysilane, N-phenyl-γ-aminopropyldimethylmethoxysilane,
N-phenyl-γ-aminopropyldiethylmethoxysilane, N-phenyl-γ-aminopropyldipropylmethoxysilane, γ-mercaptopropyldimethylmethoxysilane, benzyldimethylmethoxysilane, trimethylethoxysilane, dimethylethylethoxysilane, dimethylpropylethoxy Silane, dimethylbutylethoxysilane, diethylpropylethoxysilane, diethylbutylethoxysilane, triethylethoxysilane, diethylpropylethoxysilane, diethylbutylethoxysilane, diethylheptylethoxysilane, diethylhexylethoxysilane, diethyloctylethoxysilane, tripropylethoxysilane , Dipropylbutylethoxysilane, dipropylhexylethoxysilane,
Dipropylheptylethoxysilane, dipropyloctylethoxysilane, dibutylpentylethoxysilane,
Dibutylhexylethoxysilane, dibutylheptylethoxysilane, trihexylethoxysilane, dihexyloctylethoxysilane, dihexyldecylethoxysilane, trioctylethoxysilane, triheptylethoxysilane, tridecylethoxysilane, trivinylethoxysilane, γ-methacryloxy Dipropylmethylethoxysilane, γ-methacryloxypropyldiethylethoxysilane, γ-methacryloxypropyldibutylethoxysilane, β- (3,4-epoxycyclohexyl) ethyldimethylethoxysilane, β- (3,4-epoxycyclohexyl) ethyl Dipropylethoxysilane, β- (3,4-epoxycyclohexyl) ethyldiethylethoxysilane, γ-methacryloxypropyldimethylethoxysilane γ-methacryloxypropyldiethylethoxysilane, γ-methacryloxypropyldipropylethoxysilane, γ-glycidoxypropyldimethylethoxysilane, γ-glycidoxypropyldiethylethoxysilane, γ-glycidoxypropyldipropylethoxysilane, N-β- (aminoethyl) γ-aminopropyldimethylethoxysilane, N-β- (aminoethyl) γ-aminopropyldiethylethoxysilane, N-β- (aminoethyl) γ-aminopropyldipropylethoxysilane, γ -Aminopropyldimethylethoxysilane, γ-aminopropyldiethylethoxysilane, γ-aminopropyldipropylethoxysilane,
N-phenyl-γ-aminopropyldimethylethoxysilane, N-phenyl-γ-aminopropyldiethylethoxysilane, N-phenyl-γ-aminopropyldipropylethoxysilane, γ-mercaptopropyldimethylethoxysilane, benzyldimethylethoxysilane, etc. The monoalkoxysilane-based monomer of

The alkoxysilane-based monomer may be preliminarily coated with the magnetic powder by a wet treatment method or a dry treatment method, or may be added together when the thermosetting silicone rubber binder and the magnetic powder are mixed. However, a more stable magnetic powder can be obtained by performing a coating treatment in advance and then performing a heat treatment at about 100 ° C. The alkoxysilane-based monomer is added and dissolved in an organic solvent such as ethanol (1 to 20 parts by weight based on 100 parts by weight of magnetic powder or magnetic powder further coated with an abietic acid compound) to form a coating solution. Prepare. The amount of the alkoxysilane-based monomer added is 0.01 to 1 with respect to the magnetic powder.
5% by weight. 0.1 to 10% by weight, particularly 1 to 7% by weight is more preferable. If the addition amount is less than 0.01% by weight,
If the rust resistance is not sufficient, and if it exceeds 15% by weight, the density of the magnetic powder is lowered and the magnetic properties and mechanical strength are lowered.

This coating solution was thoroughly mixed and stirred with magnetic powder in a planetary mixer (40 rpm, 20 ° C.,
Hold / stir time 20 minutes), and finally 100-150
Dry in a vacuum oven at 0 ° C. for 10 to 30 hours to coat the magnetic powder.

If a rare earth-iron-nitrogen alloy powder is used as the magnetic powder and is coated with the above-mentioned alkoxysilane in advance, the resin binder can be filled at a high ratio of 90% by weight or more. It is also possible to obtain a resin-bonded magnet having characteristics. As described above, when the magnetic powder is coated with the alkoxysilane-based monomer (C2), the magnetic powder is covered with the alkoxysilane film having a hydrophobic alkyl group, so that oxygen and water are not attracted and rust resistance is improved. It is considered to give a remarkable effect. In the present invention, the magnetic powder is previously abietic acid compound (C1) or alkoxysilane monomer (C2).
Since it has only to be covered with, there is an advantage that the manufacturing process can be simplified. However, if the magnetic powder is coated with both components of the abietic acid compound and the alkoxysilane monomer, a greater effect can be obtained. The reason for this has not been completely clarified, but if the magnetic powder is coated with an abietic acid compound, it reacts when the released reactive group comes into contact with the alkoxysilane monomer, or
It is considered that they interact with each other and strongly adhere to the magnetic powder. When the magnetic powder is coated with both the abietic acid compound and the alkoxysilane monomer, each component may be added to the magnetic powder simultaneously or sequentially. Either a wet treatment method of volatilizing the solvent after diluting with a solvent or the like, or a dry method of directly adding a coating component during stirring may be employed. It is preferable because the surface can be uniformly coated.

D Other Additives In addition to these essential components, the composition of the present invention includes a curing agent for thermosetting resin, a curing catalyst (reaction accelerator, reaction initiator, etc.), a reactive diluent, Non-reactive diluents, various modifiers, thickeners, lubricants, release agents, ultraviolet absorbers, flame retardants and various heat stabilizers can be added.

As the curing agent, an organic peroxide is generally used, for example, methyl ethyl ketone peroxide,
Ketone peroxides such as cyclohexanone peroxide, 3,3,5-trimethylcyclohexanone peroxide, methylcyclohexanone peroxide, methylacetoacetate peroxide, and acetylketone peroxide; 3,3,5-trimethylcyclohexane, 1,1- Bis (t-butylperoxy) cyclohexane, 2,2-bis (t-butylperoxy) octane, n-butyl-4,4-bis (t-butylperoxy) valerate, 2,2-bis (t- Peroxyketals such as butylperoxy) butane; t-butyl hydroperoxide, cumene hydroperoxide,
Di-isopropylbenzene hydroperoxide, methane hydroperoxide, 2,5-dimethylhexane-2,5-dihydroperoxide, 1,1,3
Hydroperoxides such as 3-tetramethylbutyl hydroperoxide; di-t-butyl peroxide, t-butylcumyl peroxide, di-cumyl peroxide, α, α′-bis (t-butylperoxy-)
Isopropyl) benzene, 2,5-dimethyl-2,5-
Di (t-butylperoxy) hexane, 2,5-dimethyl-2,5-di (t-butylperoxy) hexyne-3
Dialkyl peroxides such as acetyl peroxide, isobutyl peroxide, octanonyl peroxide, decanoyl peroxide, lauroyl peroxide, 3,5,5-trimethylhexanoyl peroxide, succinic acid peroxide, benzoyl peroxide, Diacyl peroxides such as 2,4-dichlorobenzoyl peroxide and toluoyl peroxide; di-isopropyl peroxydicarbonate, di-2-ethylhexyl peroxydicarbonate, di-n-propyl peroxydicarbonate, bis-
(4-t-butylcyclohexyl) peroxydicarbonate, di-myristyl peroxydicarbonate, di-2
Peroxydicarbonates such as ethoxyethyl peroxydicarbonate, di-methoxyisopropyl peroxydicarbonate, di (3-methyl-3-methoxybutyl) peroxydicarbonate, diallylperoxydicarbonate; t-butylpero Xyacetate, t-butylperoxyisobutyrate, t-butylperoxypivalate, t-butylperoxyneodecanoate, cumylperoxyneodecanoate, t-butylperoxy-2-ethylhexanoate, t -Butylperoxy-3,5,5-
Trimethylhexanoate, t-butylperoxylaurate, t-butylperoxybenzoate, di-t-butylperoxyisophthalate, 2,5-dimethyl-2,5
-Di (benzoylperoxy) hexane, t-butylperoxymaleic acid, t-butylperoxyisopropyl carbonate, cumylperoxyoctoate, t-
Peroxyesters such as hexyl peroxy neodecanoate, t-hexyl peroxy pivalate, t-butyl peroxy neo hexanoate, t-hexyl peroxy neo hexanoate, cumyl peroxy neo hexanoate, Acetylcyclohexylsulfonylperoxide,
Examples thereof include t-butyl peroxyallyl carbonate.

The organic peroxide may be used by diluting it with a hydrocarbon solution or a phthalic acid ester, or absorbing it in a solid powder. A decomposition temperature of 1 for a half-life of 10 hours
A peroxide having a temperature of 20 ° C. or lower, especially, a decomposition temperature of 40
Peroxides at -100 ° C are preferred. This decomposition temperature is 12
When an organic peroxide having a temperature higher than 0 ° C. is used, the curing temperature of the molded product will be high. Further, an organic peroxide having a temperature of lower than 40 ° C. has poor handleability and deteriorates storage characteristics and productivity of the magnet composition. The organic peroxide may be added in an amount of 0.01 to 5% by weight with respect to the unsaturated polyester resin, depending on the dilution ratio and the amount of active oxygen. In addition, cobalt organic acid salts such as cobalt naphthenate and cobalt octylate, β-diketones such as acetylacetone, ethyl acetoacetate and dimedone,
Aromatic tertiary amines such as dimethylaniline, mercaptans, phosphorus compounds such as triphenylphosphine and 2-ethylhexylphosphite, accelerators such as quaternary ammonium salts, and azo such as azobisisobutyronitrile. You may use together with a compound, an aromatic carbonyl compound, a pinacolone derivative, etc.

Examples of the reactive diluent include styrene, fatty acid diglycidyl ether, ethylene glycol glycidyl ether, phenyl glycidyl ether and glycerin polyglycidyl ether. Examples of the non-reactive diluent include alcohols such as ethanol and isopropanol. Examples of the modifier include liquid polysulfide polymer and phenol-modified aromatic polymer. As a thickener, beryllium oxide, magnesium oxide, magnesium hydroxide, calcium oxide,
Examples thereof include calcium hydroxide and zinc oxide.

Examples of the lubricant include waxes such as paraffin wax, liquid paraffin, polyethylene wax, polypropylene wax, polyester wax, carnauba wax and micro wax; stearic acid,
Fatty acids such as 1,2-oxystearic acid, lauric acid, palmitic acid, and oleic acid; calcium stearate, barium stearate, magnesium stearate, lithium stearate, zinc stearate, aluminum stearate, calcium laurate, zinc linoleate , Fatty acid salts (metal soaps) such as calcium ricinoleate, zinc 2-ethylhexoate; stearic acid amide, oleic acid amide, erucic acid amide, behenic acid amide, palmitic acid amide, lauric acid amide, hydroxystearic acid amide, methylene Bis stearic acid amide, ethylene bis stearic acid amide, ethylene bislauric acid amide, distearyl adipic acid amide, ethylene bisoleic acid amide, dioleyl adipic acid amide, N-stearyl Fatty acid amides such as theearic acid amide; fatty acid esters such as butyl stearate; alcohols such as ethylene glycol, stearyl alcohol; polyethylene glycol, polypropylene glycol, polytetramethylene glycol, and polyethers composed of these modified products; dimethyl poly Polysiloxanes such as siloxane and silicon grease; fluorinated oil,
Fluorine compounds such as fluorine grease and fluorine-containing resin powder,
Inorganic compound powders such as silicon nitride, silicon carbide, magnesium oxide, alumina, silicon dioxide and molybdenum disulfide can be used.

Examples of the releasing agent include zinc stearate, a mixed system of stearic acid metal salt and zinc stearate, and the like. As the ultraviolet absorber, phenyl salicylate, p-tert-butylphenyl salicylate, 2,4-dihydroxy-benzophenone, 2-hydroxy-4-methoxybenzophenone, 3-2'-dihydroxy-4-
Benzophenone series such as methoxybenzophenone; 2-
Benzotriazoles such as (2′-hydroxy-5′-methylphenyl) benzotriazole and 2- (2′-hydroxy-3 ′, 5′-ditertiarybutylphenyl) benzotriazole; oxalic acid anilide derivatives and the like. .
Examples of the flame retardant include antimony trioxide, sodium antimonate, organic bromine compounds, chlorinated paraffin, chlorinated polyethylene and the like. The heat stabilizer is not particularly limited, but examples thereof include hindered amine-based heat stabilizers such as bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate, phenol-based, phosphite-based, and thioether-based heat stabilizers. Can be mentioned.

The magnetic powder coated by the above method can be mixed with a resin binder to obtain the resin-bonded magnet composition of the present invention. The mixing method is not particularly limited, and for example, a mixer such as a ribbon blender, a tumbler, a Nauter mixer, a Henschel mixer, a super mixer, a planetary mixer, or a Banbury mixer, a kneader, a roll, a kneader ruder, a single screw extruder, a twin mixer A kneader such as a shaft extruder can be used.

2. Method for producing resin-bonded magnet The resin-bonded magnet composition can be obtained by injection molding, compression molding, extrusion molding, roll molding, transfer molding, etc. in addition to magnetic properties, shape flexibility, and rust resistance. A resin-bonded magnet having excellent characteristics, mechanical strength, flexibility and heat resistance can be easily manufactured.

Since the curing reaction type silicone rubber is also a thermosetting resin, it is preferable to use a mixer having a weak shearing force and a cooling function so that the curing does not proceed due to heat generation due to shearing during mixing. Since the composition is lumped by mixing, it is molded by an injection molding method, a compression molding method, an extrusion molding method, a rolling molding method, a transfer molding method, or the like. In the present invention, the injection molding method is particularly preferable, and in this case, the maximum history temperature is 200 ° C. or less, preferably 15
Mold under the condition of 0 ° C or lower. Maximum history temperature is 200
If the temperature exceeds ℃, there is a problem that the magnetic properties are deteriorated, which is not preferable.

[0046]

EXAMPLES The present invention will be specifically described below with reference to examples and comparative examples, but the present invention is not limited to these examples.

The following materials were used as raw materials for the resin-bonded magnet composition. A Magnetic powder / Magnetic powder 1: SmFeN-based magnetic powder "Product name: SmFeN alloy powder", Sumitomo Metal Mining Co., Ltd.
Manufactured, anisotropic magnetic field: 210 kOe, containing 99% of particle size 100 μm or less. -Magnetic powder 2: SmCo-based magnetic powder "Brand name: RCo ₅ alloy", manufactured by Sumitomo Metal Mining Co., Ltd., anisotropic magnetic field: 246 kOe, containing 99% of a particle size of 100 μm or less. -Magnetic powder 3: NdFeB magnetic powder "Brand name: MQP-B", manufactured by Magnequench International, anisotropic magnetic field: 70 kOe, particle size of 100 μm or less, 33% content.

B1 Curing reaction type silicone rubber binder (abbreviated as Si rubber. Viscosity is AST at 150 ° C.)
The values are measured with an M100 type rheometer. ) -Si rubber 1: "Product name: KE2000-20" manufactured by Shin-Etsu Chemical Co., Ltd. (viscosity 180 Pas) -Si rubber 2: "Product name: KE2000-30" manufactured by Shin-Etsu Chemical Co., Ltd. (viscosity) 250 Pa · s) Si rubber 3: “Product name: KE2000-50”, manufactured by Shin-Etsu Chemical Co., Ltd. (viscosity 800 Pa · s) B2 thermoplastic resin, nylon 12 (abbreviated as PA12), “Product name: Daiamide A” -1709P ", manufactured by Daicel Hüls Ltd. (average molecular weight 15,000 or less)

C1 abietic acid compound (abbreviated as rosin) rosin 1, "trade name: super ester A-10
0 ", manufactured by Arakawa Chemical Industry Co., Ltd. -Rosin 2, "trade name: ester gum AAG", manufactured by Arakawa Chemical Industry Co., Ltd. -Rosin 3, "Product name: Marquid No. 2", manufactured by Arakawa Chemical Industry Co., Ltd.

C2 Alkoxysilane monomer (Si
Abbreviated as monomer) ・ Si monomer 1: γ-methacryloxypropyltrimethoxysilane, "Product name: Shin-Etsu Silicone KBM50
3 ", manufactured by Shin-Etsu Chemical Co., Ltd. Si monomer 2: N-β- (aminoethyl) γ-aminopropyltrimethoxysilane, "trade name: Shin-Etsu Silicone KBM603", manufactured by Shin-Etsu Chemical Co., Ltd. -Si monomer 3: decyltrimethoxysilane, "trade name: Shin-Etsu Silicone KBM3103C", manufactured by Shin-Etsu Chemical Co., Ltd.

The resin-bonded magnet composition was manufactured by the following method. Coating treatment with abietic acid compound With respect to 100 parts by weight of the above magnetic powder, a coating solution prepared by dissolving a predetermined amount of abietic acid compound in 10 parts by weight of an organic solvent such as ethanol is prepared. Mix well in a planetary mixer (40 rpm,
After holding at 20 ° C for 20 minutes with stirring and stirring), -760 mm
Hg, dried in a vacuum oven at 120 ° C. for 24 hours,
A coated magnetic powder is obtained.

Magnetic powder coated with an alkoxysilane-based monomer, or 100 parts by weight of magnetic powder further coated with an abietic acid-based compound, was added to a predetermined amount of alkoxy in 10 parts by weight of an organic solvent such as ethanol. A coating solution in which a silane-based monomer is dissolved is prepared, and this and magnetic powder are sufficiently mixed and stirred in a planetary mixer (4
0 rpm, 20 ° C, holding / stirring time 20 minutes), then-
The coated magnetic powder is obtained by drying in a vacuum oven at 760 mmHg and 120 ° C. for 24 hours.

Mixing of resin binder and preparation of composition for resin-bonded magnet To the coated magnetic powder, a curing reaction type silicone rubber or a thermoplastic resin was added in a predetermined ratio and mixed well in a planetary mixer. Stirring to obtain a resin-bonded magnet composition. When using a thermoplastic resin (nylon 12), 20 mmφ single extruder (L / D = 25, CR =
2.0, rotation speed = 20 rpm, 5 mmφ strand die, cylinder temperature 200 to 220 ° C., die temperature 10
Extruding at 0 ° C. to 150 ° C., and using a hot-cut pelletizer, a pellet compound for molding a resin-bonded magnet of φ5 mm × 5 mm is prepared.

Injection Molding Method The composition (pellet compound) thus obtained is molded by an injection molding machine to have a diameter of 10 mm × 15 mm, and a cylindrical resin-bonded magnet for testing is obtained. Cylinder temperature is 2
00 to 220 ° C (however, in the case of nylon 12, 250
C.) and the mold temperature is 150 to 200.degree. C. (however, 100.degree. C. for nylon 12). In addition, NdFeB
For magnetic powders other than those of the system, they are molded in a mold in a magnetic field of 15 to 20 kOe.

The resin-bonded magnet sample (Example) obtained by coating the magnetic powder, mixing it with a resin binder, and injection-molding it was measured and evaluated in the following manner.
A sample (comparative example) not coated with the magnetic powder was also measured and evaluated in the same manner.

Magnetic property evaluation The magnetic properties (coercive force, magnetization, squareness) of the sample were measured at room temperature with a Thiophy type self-recording magnetometer to determine the maximum energy product.・ Leave the rust resistant sample in a constant temperature and humidity of 80 ° C and 90% humidity,
The time until rust was generated was observed in units of 24 hours, and the rust characteristics were evaluated. If rust does not occur for 48 hours or more, there is no practical problem.

(Examples 1 to 12) Magnetic powder 1 (SmFeN type magnetic powder) was first coated with rosin 1 (abietic acid type compound) as magnetic powder, and then Si rubber 1 (curing reaction type silicone rubber type binder). , "Product name: KE200
0-20 ") to prepare a resin-bonded magnet composition of the present invention, which was injection-molded to produce a resin-bonded magnet. The magnetic properties and the like of this magnet were investigated, and the results are shown in Table 1. Similarly, an experiment was carried out when magnetic powder 1 was coated with rosin 2 and when it was coated with rosin 3. The results are also shown in Table 1. Further, magnetic powder 1 is added to rosin 1 and rosin 2
Experiments were also carried out when coated with a mixture of rosin 1 and rosin 1 and rosin 3. The results are shown in Table 2. On the other hand, the magnetic powder 1 is first coated with rosin 1 and then mixed with Si rubber 2 (curing reaction type silicone rubber binder, "trade name: KE2000-30") to prepare a resin-bonded magnet of the present invention. A composition was prepared and injection-molded to produce a resin-bonded magnet. Magnetic powder 2 instead of magnetic powder 1
Experiments were also performed using. The magnetic properties and the like of these magnets were examined, and the results are also shown in Table 2.

[0058]

[Table 1]

[0059]

[Table 2]

(Examples 13 to 24) According to the above procedure, the magnetic powder 1 was first coated with the Si monomer 1 (γ-methacryloxypropyltrimethoxysilane), and then the Si rubber 1 was coated.
(Curing reaction type silicone rubber binder, "Product name:
KE2000-20 ") to prepare a composition. This was injection-molded and the magnetic properties and the time until rust were generated were measured. The results are shown in Table 3. Further, instead of the Si monomer 1, N-β- (aminoethyl) γ-aminopropyltrimethoxysilane of the Si monomer 2, S
Experiments were also performed using decyltrimethoxysilane, which is i-monomer 3. The results are also shown in Table 3. Similarly,
Si monomer 1 and Si monomer 2 or Si monomer 3
An experiment was carried out with the combination of. Also, first add the magnetic powder 1 to S
i monomer 1 and then Si rubber 2 (“trade name: K
E2000-30 ″) to prepare a resin-bonded magnet composition of the present invention, which was injection-molded to produce a resin-bonded magnet. Furthermore, instead of magnetic powder 1, magnetic powder 2
Alternatively, the experiment was performed also when the magnetic powder 3 was used. The magnetic properties and the like of these magnets were examined, and the results are shown in Table 4.

[0061]

[Table 3]

[0062]

[Table 4]

Example 25 Magnetic powder 1 was prepared according to the above procedure.
Is first coated with rosin 1 (abietic acid compound),
Further, after coating with Si monomer 1 (alkoxysilane-based monomer), it was mixed with Si rubber 1 to prepare a composition of the present invention. This was injection-molded, its magnetic characteristics and the time until rust were generated were measured, and the results are shown in Table 4.

Comparative Examples 1 to 7 Magnetic powder 1 was replaced with rosin 1
(Product name: super ester A-100) and Si monomer 1 (γ-methacryloxypropyltrimethoxysilane) are not coated, but mixed with Si rubber 2,
A comparative composition was prepared and injection molded. The magnetic properties and the time until the occurrence of rust were measured and shown in Table 5. Also,
When the Si rubber 2 is replaced with the Si rubber 3 (curing reactive rubber-based binder, "trade name: 2000-50"), and the magnetic powder 1 is coated with either the rosin 1 or the Si monomer 1 Experiments were also performed when mixed with Rubber 3.
Experiments were also performed when Si rubber 3 was replaced by nylon 12 and mixed, and when magnetic powder 1 was replaced by magnetic powder 2. These results are also shown in Table 5.

[0065]

[Table 5]

From the results of these examples, magnetic properties can be obtained by coating the magnetic powder with either the abietic acid compound or the alkoxysilane monomer and mixing it with a curing reaction type rubber binder having a specific dynamic viscosity. It can be seen that the rust resistance can be improved without lowering the rust resistance. It is also understood that a more remarkable effect is exhibited by first coating with the abietic acid compound and then coating with the alkoxysilane monomer. On the other hand, from the results of Comparative Examples, the magnetic powder, if not coated with either the abietic acid-based compound or the alkoxysilane-based monomer, the desired effect is not exhibited, and even if the coating treatment is performed, the dynamic viscosity is It can be seen that when mixed with a curing reaction type rubber binder which is too high, molding becomes impossible.

[0067]

As described above, according to the resin-bonded magnet composition of the present invention, it has excellent magnetic properties, not only the degree of freedom in shape, but also rust resistance that has not been obtained until now, and mechanical strength. In addition to providing resin-bonded magnets with improved flexibility, heat resistance, etc., this magnet can be used in a wide range of fields including general home appliances, communication / audio equipment, medical equipment, and general industrial equipment. The target value is extremely large.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H01F 41/02 H01F 41/02 G // C08L 83/04 C08L 83/04 (72) Inventor Isao Kaneko Chiba Ichikawa City, Chugoku 3-18-5 Sumitomo Metal Mining Co., Ltd. Central Research Laboratory (72) Inventor Shoichi Yoshizawa 3-18-5 Ichikawa, Chiba Chugoku Branch 3-18-5 Sumitomo Metal Mining Co., Ltd. Central Research Laboratory F-term (reference) 4J002 CP031 DA066 DA086 DA116 FB086 FB096 FD206 4K018 AA27 BA18 CA09 CA29 CA31 CA36 GA04 KA46 5E040 AA03 BB05 CA01 HB17 NN06 NN18 5E062 CC05 CD05 CE02 CE03 CE04 CE05 CG03

Claims (11)

[Claims] 1. A resin-bonded magnet composition comprising a magnetic powder (A) and a resin binder (B), wherein the resin binder (B) is a curing reaction type silicone rubber binder having a dynamic viscosity of 500 Pa · s or less. And the magnetic powder (A) is coated with at least one compound selected from an abietic acid compound (C1) and an alkoxysilane monomer (C2). object. 2. The magnetic powder (A) has an anisotropic magnetic field (H
2. A) is 50 kOe or more.
The composition for resin-bonded magnets according to 1. 3. The magnetic powder (A) is 30% by weight of the magnetic powder having a particle diameter of 100 μm or less based on the total amount of the magnetic powder (A).
The composition for a resin-bonded magnet according to claim 1, containing the above. 4. The composition for resin-bonded magnet according to claim 1, wherein the magnetic powder (A) is a rare earth-iron-nitrogen system. 5. The resin-bonded magnet composition according to claim 1, wherein the resin binder (B) is a two-component thermosetting silicone rubber. 6. The resin according to claim 1, wherein the resin binder (B) is a linear, branched or crosslinked thermosetting silicone rubber having a polysiloxane bond in its main skeleton. Composition for combined magnet. 7. The abietic acid compound (C1) is at least one compound selected from abietic acid represented by the following general formula (1), an isomer thereof, or a derivative thereof. The composition for resin-bonded magnets according to claim 1. C ₁₉ H _n COOH (1) (In the formula, n is an integer of 25 or more and 33 or less.) 8. An alkoxysilane monomer (C2)
Is a compound represented by the following general formula (2): The composition for resin-bonded magnets according to claim 1, wherein R _(4-n) -Si-X _(n) (2) (In the formula, R is a linear, branched or cyclic alkyl group, or an alkyl group having an oxygen-containing, nitrogen-containing or sulfur-containing substituent. In any of the above, X represents a hydrolyzable group, and n is an integer less than 4.) 9. The content of the abietic acid compound (C1) or the alkoxysilane monomer (C2) is 0.01 to 10% by weight based on the magnetic powder (A). Item 2. A resin-bonded magnet composition according to Item 1. 10. The resin-bonded magnet composition according to claim 1, which is molded by any molding method selected from an injection molding method, a compression molding method, an extrusion molding method, and a rolling molding method. A method for manufacturing a resin-bonded magnet. 11. The method for producing a resin-bonded magnet according to claim 10, wherein the resin-bonded magnet composition is molded by injection molding under the condition that the maximum hysteresis temperature is 200 ° C. or lower.