EP4589608A1 - Harzzusammensetzung für verbundmagnet und damit geformter verbundmagnetkörper - Google Patents

Harzzusammensetzung für verbundmagnet und damit geformter verbundmagnetkörper

Info

Publication number
EP4589608A1
EP4589608A1 EP23865245.7A EP23865245A EP4589608A1 EP 4589608 A1 EP4589608 A1 EP 4589608A1 EP 23865245 A EP23865245 A EP 23865245A EP 4589608 A1 EP4589608 A1 EP 4589608A1
Authority
EP
European Patent Office
Prior art keywords
bonded magnet
resin
resin composition
molded body
powder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP23865245.7A
Other languages
English (en)
French (fr)
Inventor
Hiromitsu Sakurai
Makoto Hino
Nobuhiro Katayama
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toda Kogyo Corp
Original Assignee
Toda Kogyo Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toda Kogyo Corp filed Critical Toda Kogyo Corp
Publication of EP4589608A1 publication Critical patent/EP4589608A1/de
Pending legal-status Critical Current

Links

Classifications

    • 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
    • H01F1/0555—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 pressed, sintered or bonded together
    • H01F1/0556—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 pressed, sintered or bonded together pressed
    • 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
    • H01F1/10—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 non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure
    • H01F1/11—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 non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles
    • H01F1/113—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 non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles in a bonding agent
    • 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
    • H01F1/06—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 in the form of particles, e.g. powder
    • H01F1/08—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 in the form of particles, e.g. powder pressed, sintered, or bound together
    • 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
    • H01F1/06—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 in the form of particles, e.g. powder
    • H01F1/08—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 in the form of particles, e.g. powder pressed, sintered, or bound together
    • H01F1/083—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 in the form of particles, e.g. powder pressed, sintered, or bound together in a bonding agent
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]

Definitions

  • An aspect of the present disclosure relates to a resin composition for a bonded magnet, and a bonded magnet molded body molded using the resin composition.
  • a bonded magnet has advantages such as light weight, excellent dimensional accuracy, and easy mass production of products having complicated shapes as compared with a sintered magnet. Therefore, a bonded magnet is widely used in various applications such as toys, office equipment, acoustic equipment, and motors.
  • rare earth magnet powder represented by an Nd-Fe-B-based magnetic powder, and ferrite particle powder are known.
  • Rare earth magnet powder has high magnetic characteristics, but is expensive and limited in usable applications.
  • ferrite particle powder is inferior to rare earth magnet powder in terms of magnetic characteristics, but is inexpensive and chemically stable. Therefore, ferrite particle powder is used in a wide range of applications.
  • a bonded magnet is generally produced by kneading rubber or a plastic material and a magnetic powder, and then molding them in a magnetic field or molding them by a mechanical method.
  • Patent Literature 1 proposes that polyamide 6 or polyamide 12 and a nonmagnetic powder are mixed at a predetermined ratio to produce a compound for a bonded magnet having high heat resistance and being excellent in mechanical strength and magnetic characteristics.
  • Patent Literature 2 proposes that a compound for a bonded magnet having high heat resistance and being excellent in mechanical strength and magnetic characteristics is produced by adding modified polyolefins and glass fiber to a PPS resin.
  • Patent Literature 3 proposes a resin composition for a bonded magnet which includes a phosphorus-based antioxidant in order to obtain a bonded magnet in which a decrease in strength is small even when exposed to a high-temperature environment.
  • a bonded magnet molded body according to an aspect of the present disclosure is a bonded magnet molded body molded using the resin composition for a bonded magnet according to any one of the first to third aspects (fourth aspect).
  • the magnetic powder in the present embodiment is not particularly limited.
  • a magnetic powder used for a bonded magnet for example, ferrite particle powder or rare earth magnetic powder can be usually used.
  • the resin having a PA10 skeleton which is used in the resin composition for a bonded magnet according to the present embodiment, has a low water absorption. Therefore, the molded body obtained by molding the resin has high dimensional stability.
  • the resin composition for a bonded magnet according to the present embodiment may contain, as the binder resin, a polyamide resin and/or various elastomers in addition to the resin having a PA10 skeleton as necessary within a range not impairing the characteristics of the resin composition for a bonded magnet of the present embodiment.
  • the resin composition for a bonded magnet of the present embodiment can contain the inorganic reinforcing material within a range not impairing the characteristics of the resin composition.
  • the content of the inorganic reinforcing material is preferably 10 wt% or less.
  • the content of the inorganic reinforcing material is more preferably 1 to 8 wt%, and further preferably 2.1 to 7 wt%.
  • the residual magnetic flux density Br when the ferrite particle powder is used as the magnetic powder is preferably 170 mT (1700 G) or more, and more preferably 175 mT (1750 G) or more.
  • the coercive force iHc of the resin composition for a bonded magnet is preferably 119 to 279 kA/m (1500 to 3500 Oe), and more preferably 127 to 259 kA/m (1600 to 3250 Oe).
  • the maximum energy product (BH)max of the resin composition for a bonded magnet is preferably 5.5 kJ/m 3 (0.70 MGOe) or more, and more preferably 10.7 kJ/m 3 (1.35 MGOe) or more.
  • the values of the residual magnetic flux density Br, the coercive force iHc, and the maximum energy product (BH)max are values measured for the molded body by a magnetism measurement method described later.
  • the residual magnetic flux density Br when the rare earth magnetic powder is used as the magnetic powder is preferably 300 mT (3000 G) or more, and more preferably 350 mT (3500 G) or more.
  • the coercive force iHc of the resin composition for a bonded magnet is preferably 636 to 955 kA/m (8000 to 12000 Oe), and more preferably 676 to 915 kA/m (8500 to 11500 Oe).
  • the maximum energy product (BH)max of the resin composition for a bonded magnet is preferably 15.9 kJ/m 3 (2.00 MGOe) or more, and more preferably 19.9 kJ/m 3 (2.50 MGOe) or more.
  • the values of the residual magnetic flux density Br, the coercive force iHc, and the maximum energy product (BH)max are values measured for the molded body by a magnetism measurement method described later.
  • the flexural strength of the molded body molded using the resin composition for a bonded magnet according to the present embodiment is desirably 110 MPa or more.
  • the mechanical strength of the molded body is low, so that cracks (cracking) of the molded body are likely to occur.
  • the IZOD impact strength of the molded body molded using the resin composition for a bonded magnet according to the present embodiment is desirably 10 kJ/m 2 or more.
  • the mechanical strength of the molded body is low, so that cracks (cracking) of the molded body are likely to occur.
  • the deflection temperature under load of the molded body molded using the resin composition for a bonded magnet according to the present embodiment is preferably 140°C or higher. When the deflection temperature under load is lower than 140°C, the molded body may be deformed in a high-temperature environment.
  • the water absorption rate of the molded body molded using the resin composition for a bonded magnet according to the present embodiment is desirably 1.0 wt% or less. When the water absorption rate exceeds 1.0 wt%, the molded body swells, and dimensional change and/or cracks (cracking) may occur in the molded body.
  • the resin composition for a bonded magnet according to the present embodiment can be obtained by a known method for producing a resin composition for a bonded magnet.
  • the resin composition for a bonded magnet is obtained, for example, by uniformly mixing a magnetic powder and a resin component having a PA10 skeleton, then melt-kneading the mixture using a kneading extruder or the like, and pulverizing or cutting the kneaded product into particles or pellets.
  • the resin composition for a bonded magnet according to the present embodiment can optionally contain a lubricant for plastic molding, various stabilizers, and the like in order to obtain effects such as improvement in moldability, improvement in heat resistance, prevention of oxidation degradation, and rust prevention.
  • lubricant to be used examples include carboxyl saturated/unsaturated fatty acid-based substances such as propionic acid, stearic acid, linoleic acid, oleic acid, malonic acid, glutaric acid, adipic acid, maleic acid, and fumaric acid, and compounds of these substances.
  • Examples of the compounds of these substances include metal soaps such as calcium stearate, magnesium stearate, and lithium stearate, fatty acid amides such as hydroxydistearamide, ethylene-bis-laurylamide, and ethylene-bis-oleamide, waxes such as paraffin wax, polysiloxanes such as dimethylpolysiloxane and silicon oil, and fluorine compounds such as fluorine-containing oil.
  • metal soaps such as calcium stearate, magnesium stearate, and lithium stearate
  • fatty acid amides such as hydroxydistearamide, ethylene-bis-laurylamide, and ethylene-bis-oleamide
  • waxes such as paraffin wax
  • polysiloxanes such as dimethylpolysiloxane and silicon oil
  • fluorine compounds such as fluorine-containing oil.
  • the resin composition for a bonded magnet in a molten state was molded in a mold having a diameter of 25 mm and a height of 10.5 mm while being magnetically oriented at 716.2 kA/m (9 kOe). Thereafter, the molded body was measured in a magnetic field of 1114.1 kA/m (14 kOe) using a "DC magnetization characteristic automatic recorder 3257" (manufactured by Yokogawa Hokushin Denki Co., Ltd.) to determine the above-described magnetic characteristics.
  • ferrite particle powder To 75.00 parts by weight of ferrite particle powder (average particle diameter: 1.20 ⁇ m, BET value: 1.75 m 2 /g, coercive force: 226 kA/m (2850 Oe), saturation magnetization: 822 Am 2 /kg (72 emu/g)), 0.50 part by weight of an aminoalkyl-based silane coupling agent was added, and warm mixing was performed at 100°C until the mixture became uniform. Thus, a surface-treated ferrite particle powder was obtained.
  • the surface-treated ferrite particle powder, 24.29 parts by weight of a PA410 resin, and 0.21 part by weight of an antioxidant were sufficiently mixed with a Henschel mixer.
  • the melting point of a PA410 resin is 250°C.
  • the chemical composition of the obtained resin composition for a bonded magnet is shown in Table 1.
  • the molding density, MFR, and magnetic characteristics of the resin composition for a bonded magnet according to each Example are shown in Table 2.
  • a resin composition for a bonded magnet was produced in the same manner as in Example 1 except that the formulations of the ferrite particle powder, the silane coupling agent, the PA410 resin, the glass fiber, and the antioxidant were variously changed as shown in Table 1.
  • a resin composition for a bonded magnet was produced in the same manner as in Example 1 except that a PA610 resin was used as the binder resin, and that the formulations of the ferrite particle powder, the silane coupling agent, the PA610 resin, the glass fiber, and the antioxidant were variously changed as shown in Table 1.
  • the melting point of the PA610 resin is 225°C.
  • a resin composition for a bonded magnet was produced in the same manner as in Example 1 except that a PA12 resin was used as the binder resin, and that the formulations of the ferrite particle powder, the silane coupling agent, the PA12 resin, the glass fiber, and the antioxidant were variously changed as shown in Table 4.
  • the melting point of the PA12 resin is 176°C.
  • Table 6 illustrates the measurement results of the flexural strength, IZOD impact strength, deflection temperature under load, and water absorption rate of a test piece molded body obtained by injection molding the resin composition for a bonded magnet of each of Comparative Examples.
  • a resin composition for a bonded magnet was produced in the same manner as in Example 1 except that a PA6 resin was used as the binder resin, and that the formulations of the ferrite particle powder, the silane coupling agent, the PA6 resin, and the antioxidant were variously changed as shown in Table 4.
  • the melting point of the PA6 resin is 225°C.
  • a resin composition for a bonded magnet was produced in the same manner as in Example 1 except that a PPS resin was used as the binder resin, and that the formulations of the ferrite particle powder, the silane coupling agent, the PPS resin, and the antioxidant were variously changed as shown in Table 4.
  • the melting point of the PPS resin is 280°C.
  • the resin compositions for a bonded magnet according to Examples had excellent characteristics regarding a deflection temperature under load as compared with the resin compositions for a bonded magnet of Comparative Examples 1 and 2 containing a PA12 resin. It was also confirmed that the resin compositions for a bonded magnet according to Examples had excellent characteristics regarding a water absorption ratio as compared with the resin compositions for a bonded magnet of Comparative Examples 3 and 4 containing a PA6 resin. It is to be noted that the resin compositions for a bonded magnet according to Examples were confirmed to have excellent characteristics regarding flexural strength and IZOD impact strength as compared with the resin compositions for a bonded magnet of Comparative Examples 5 and 6 containing a PPS resin.
  • the resin composition for a bonded magnet according to the present embodiment when used, a molded body having high magnetic force properties, physical properties, and deflection temperature under load as well as a reduced water absorption rate can be obtained. Therefore, the resin composition for a bonded magnet according to the present embodiment can be suitably used as a material for a bonded magnet.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Hard Magnetic Materials (AREA)
EP23865245.7A 2022-09-14 2023-08-28 Harzzusammensetzung für verbundmagnet und damit geformter verbundmagnetkörper Pending EP4589608A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022145938 2022-09-14
PCT/JP2023/030855 WO2024057888A1 (ja) 2022-09-14 2023-08-28 ボンド磁石用樹脂組成物ならびにそれを用いて成形されたボンド磁石成形体

Publications (1)

Publication Number Publication Date
EP4589608A1 true EP4589608A1 (de) 2025-07-23

Family

ID=90275019

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23865245.7A Pending EP4589608A1 (de) 2022-09-14 2023-08-28 Harzzusammensetzung für verbundmagnet und damit geformter verbundmagnetkörper

Country Status (6)

Country Link
EP (1) EP4589608A1 (de)
JP (1) JPWO2024057888A1 (de)
KR (1) KR20250054226A (de)
CN (1) CN119731752A (de)
TW (1) TW202412024A (de)
WO (1) WO2024057888A1 (de)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2752775B2 (ja) 1990-06-12 1998-05-18 住友ベークライト株式会社 プラスチック磁石組成物
JPH0997709A (ja) * 1996-04-17 1997-04-08 Bridgestone Corp 合成樹脂磁石用組成物
JP2000114031A (ja) * 1998-10-09 2000-04-21 Toda Kogyo Corp マグネットロール
JP2001057304A (ja) * 1999-06-11 2001-02-27 Seiko Epson Corp 磁石粉末および等方性ボンド磁石
JP4548572B2 (ja) 2003-08-25 2010-09-22 戸田工業株式会社 ボンド磁石組成物および該組成物からなる成形品
JP2005162802A (ja) * 2003-12-01 2005-06-23 Mate Co Ltd 射出成形用樹脂組成物及び永久磁石製品の製造方法
JP4910316B2 (ja) * 2005-06-21 2012-04-04 日本精工株式会社 磁気エンコーダ及び前記磁気エンコーダを備える転がり軸受ユニット
JP5234207B2 (ja) * 2011-09-17 2013-07-10 Ｔｄｋ株式会社 ボンド磁石用コンパウンド、及び、ボンド磁石
JP6248529B2 (ja) 2013-10-11 2017-12-20 日亜化学工業株式会社 ボンド磁石用樹脂組成物及びそれを用いたボンド磁石

Also Published As

Publication number Publication date
WO2024057888A1 (ja) 2024-03-21
CN119731752A (zh) 2025-03-28
KR20250054226A (ko) 2025-04-22
TW202412024A (zh) 2024-03-16
JPWO2024057888A1 (de) 2024-03-21

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