JP2007281381A - Resin composite material for ferrite bond magnet, and bond magnet molding - Google Patents
Resin composite material for ferrite bond magnet, and bond magnet molding Download PDFInfo
- Publication number
- JP2007281381A JP2007281381A JP2006109281A JP2006109281A JP2007281381A JP 2007281381 A JP2007281381 A JP 2007281381A JP 2006109281 A JP2006109281 A JP 2006109281A JP 2006109281 A JP2006109281 A JP 2006109281A JP 2007281381 A JP2007281381 A JP 2007281381A
- Authority
- JP
- Japan
- Prior art keywords
- ferrite
- composite material
- resin composite
- bond magnet
- weight
- 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
Links
- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 68
- 239000000463 material Substances 0.000 title claims abstract description 57
- 239000000805 composite resin Substances 0.000 title claims abstract description 46
- 238000000465 moulding Methods 0.000 title description 14
- -1 phosphorous acid compound Chemical class 0.000 claims abstract description 27
- NBIIXXVUZAFLBC-UHFFFAOYSA-N phosphoric acid Substances OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 32
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 22
- 229920000299 Nylon 12 Polymers 0.000 claims description 7
- 238000001746 injection moulding Methods 0.000 claims description 7
- 229920005992 thermoplastic resin Polymers 0.000 claims description 4
- 238000001035 drying Methods 0.000 abstract description 7
- 230000006866 deterioration Effects 0.000 abstract description 5
- 235000011007 phosphoric acid Nutrition 0.000 description 24
- 238000004381 surface treatment Methods 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 15
- 230000000694 effects Effects 0.000 description 15
- 238000011156 evaluation Methods 0.000 description 13
- 239000006247 magnetic powder Substances 0.000 description 13
- 229910052751 metal Inorganic materials 0.000 description 13
- 239000002184 metal Substances 0.000 description 13
- 238000000034 method Methods 0.000 description 13
- 238000012360 testing method Methods 0.000 description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 230000007423 decrease Effects 0.000 description 11
- 229910052761 rare earth metal Inorganic materials 0.000 description 11
- 239000002253 acid Substances 0.000 description 10
- 150000002910 rare earth metals Chemical class 0.000 description 10
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 9
- 239000000203 mixture Substances 0.000 description 8
- 229910052712 strontium Inorganic materials 0.000 description 8
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 8
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 7
- 238000010306 acid treatment Methods 0.000 description 7
- 238000005452 bending Methods 0.000 description 7
- 229910019142 PO4 Inorganic materials 0.000 description 6
- 239000002131 composite material Substances 0.000 description 6
- 239000010452 phosphate Substances 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 239000011342 resin composition Substances 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 239000007822 coupling agent Substances 0.000 description 5
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 235000014113 dietary fatty acids Nutrition 0.000 description 4
- 239000000194 fatty acid Substances 0.000 description 4
- 229930195729 fatty acid Natural products 0.000 description 4
- 150000004665 fatty acids Chemical class 0.000 description 4
- 239000000314 lubricant Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 230000008961 swelling Effects 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 3
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 3
- 239000004952 Polyamide Substances 0.000 description 3
- 239000003963 antioxidant agent Substances 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 229920002647 polyamide Polymers 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000003078 antioxidant effect Effects 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- GLDOVTGHNKAZLK-UHFFFAOYSA-N octadecan-1-ol Chemical compound CCCCCCCCCCCCCCCCCCO GLDOVTGHNKAZLK-UHFFFAOYSA-N 0.000 description 2
- 239000004014 plasticizer Substances 0.000 description 2
- 229920000069 polyphenylene sulfide Polymers 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- FZHAPNGMFPVSLP-UHFFFAOYSA-N silanamine Chemical compound [SiH3]N FZHAPNGMFPVSLP-UHFFFAOYSA-N 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 229920002725 thermoplastic elastomer Polymers 0.000 description 2
- DNIAPMSPPWPWGF-GSVOUGTGSA-N (R)-(-)-Propylene glycol Chemical compound C[C@@H](O)CO DNIAPMSPPWPWGF-GSVOUGTGSA-N 0.000 description 1
- 239000004254 Ammonium phosphate Substances 0.000 description 1
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 229920000106 Liquid crystal polymer Polymers 0.000 description 1
- 229920002292 Nylon 6 Polymers 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 239000006087 Silane Coupling Agent Substances 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- QIMZHEUFJYROIY-UHFFFAOYSA-N [Co].[La] Chemical compound [Co].[La] QIMZHEUFJYROIY-UHFFFAOYSA-N 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 description 1
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 description 1
- 229910000148 ammonium phosphate Inorganic materials 0.000 description 1
- 235000019289 ammonium phosphates Nutrition 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 239000011162 core material Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- BNIILDVGGAEEIG-UHFFFAOYSA-L disodium hydrogen phosphate Chemical compound [Na+].[Na+].OP([O-])([O-])=O BNIILDVGGAEEIG-UHFFFAOYSA-L 0.000 description 1
- 229910000397 disodium phosphate Inorganic materials 0.000 description 1
- 235000019800 disodium phosphate Nutrition 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 235000019837 monoammonium phosphate Nutrition 0.000 description 1
- 230000008450 motivation Effects 0.000 description 1
- GOQYKNQRPGWPLP-UHFFFAOYSA-N n-heptadecyl alcohol Natural products CCCCCCCCCCCCCCCCCO GOQYKNQRPGWPLP-UHFFFAOYSA-N 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- WGOROJDSDNILMB-UHFFFAOYSA-N octatriacontanediamide Chemical compound NC(=O)CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC(N)=O WGOROJDSDNILMB-UHFFFAOYSA-N 0.000 description 1
- AJCDFVKYMIUXCR-UHFFFAOYSA-N oxobarium;oxo(oxoferriooxy)iron Chemical compound [Ba]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O AJCDFVKYMIUXCR-UHFFFAOYSA-N 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- TXDNPSYEJHXKMK-UHFFFAOYSA-N sulfanylsilane Chemical compound S[SiH3] TXDNPSYEJHXKMK-UHFFFAOYSA-N 0.000 description 1
- 239000012756 surface treatment agent Substances 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
Landscapes
- Hard Magnetic Materials (AREA)
Abstract
Description
本発明はボンド磁石用樹脂複合材料、及びそれを用いて製造されるボンド磁石成型品に関するものである。 The present invention relates to a resin composite material for bonded magnets, and a bonded magnet molded product manufactured using the same.
近年最終製品の小型化にともなう磁石の小型化の要求に対応するために、その原材料となるボンド磁石樹脂複合材料の磁気特性の向上が求められている。一般的にフェライトボンド磁石用樹脂複合材料においては、フェライトを高充填化することで磁気特性を向上させることが可能であるが、フェライトの充填率が高くなれば、樹脂組成物中のバインダ含有量が相対的に低下し、樹脂複合材料組成物の加工時の流動性や成型品強度が低下する問題がある。 In recent years, in order to meet the demand for miniaturization of magnets accompanying the miniaturization of final products, improvement in magnetic properties of bonded magnet-resin composite materials as raw materials has been demanded. Generally, in resin composite materials for ferrite bonded magnets, it is possible to improve the magnetic properties by increasing the ferrite content, but if the ferrite filling rate increases, the binder content in the resin composition However, there is a problem that the fluidity at the time of processing the resin composite material composition and the strength of the molded product are lowered.
また、ファンモーター等へ使用されるボンド磁石により製造されるロータは、樹脂複合材料と金属シャフトや金属コア材などの金属部材をインサート成型する場合が多くある。このような場合、樹脂複合材料と金属部材は線膨張係数が大きく異なるために、インサート成型品の環境温度が大きく変化する場合には、それらの線膨張係数の差により、樹脂複合材料と金属部材の間の界面にひずみが発生し、クラック発生に至る場合があるという問題があった。特にフェライト充填率が高い場合、たとえば８８重量％以上のような場合には、樹脂複合材料の機械強度が低充填率の樹脂複合材料に比べて、クラックの発生問題もいっそう深刻となる。 Further, a rotor manufactured by a bonded magnet used for a fan motor or the like is often insert-molded with a resin composite material and a metal member such as a metal shaft or a metal core material. In such a case, the resin composite material and the metal member have greatly different linear expansion coefficients. Therefore, when the environmental temperature of the insert-molded product changes greatly, the resin composite material and the metal member are There was a problem that distortion occurred at the interface between the two, leading to cracks. In particular, when the ferrite filling rate is high, for example, 88% by weight or more, the problem of occurrence of cracks becomes more serious as compared with the resin composite material having a low mechanical strength of the resin composite material.
さらに、エアコンファンモーター用のボンドマグネットの材料にはストロンチウムフェライトとポリアミド１２からなる樹脂複合材料が一般的に使用され、要求される磁気特性１６ｋＪ／ｍ３以上である。この磁気特性を実現するために必要なストロンチウムフェライト充填率は９０重量％以上であり、この用途においてはクラックの問題に関しても深刻であり、対策が強く求められている。 Further, a resin composite material composed of strontium ferrite and polyamide 12 is generally used as a material for a bond magnet for an air conditioner fan motor, and has a required magnetic property of 16 kJ / m 3 or more. The strontium ferrite filling rate necessary for realizing this magnetic property is 90% by weight or more, and in this application, the problem of cracks is also serious, and countermeasures are strongly demanded.
これらに対しては、温度変化で発生するひずみを吸収するのに十分な柔軟性を持つ樹脂複合材料の開発が行われており、バインダ成分に着目した技術が開示されている。たとえば、曲げたわみ、ひずみについて特許文献1に公開されている。
しかし、フェライトの表面処理は一般的なカップリング処理を行う点しか開示されておらず、クラック発生を防止することに対する表面処理の有効性については何ら示されていない。
For these, a resin composite material having sufficient flexibility to absorb strain generated by temperature change has been developed, and a technique focusing on the binder component is disclosed. For example, Patent Document 1 discloses bending bending and strain.
However, the surface treatment of ferrite only discloses a general coupling treatment, and does not show the effectiveness of the surface treatment for preventing the occurrence of cracks.
射出成型ボンド磁石は、焼結磁石や圧縮成型磁石に比較して複雑な形状に対応ができるという特徴がある。その特徴をさらに引き出すために材料流動性を向上させることは、重要な技術課題であり、そのためにフェライトボンド磁石用樹脂組成物に使用されるフェライトの表面処理についてもの様々な検討がなされている。たとえば、フェライトの表面を炭酸で処理する技術が特許文献２に開示されている。この中で開示されている炭酸処理の目的は、フェライトの製造後に大気中の炭酸ガスが時間をかけて吸着して安定化させる、いわゆるエージング工程について時間をかけて行う代わりに、炭酸ガスをフェライト表面へ強制的に接触させることで、より効率的に安定化させることである。したがって、フェライト表面を他の種類の酸、例えばリン酸化合物などによって処理することとは、全く別の技術思想であり、炭酸の変わりに他の酸を採用することによって、樹脂複合材料を乾燥したときに起こる流動性低下現象の改善効果や、成型品の機械強度向上や耐水性向上などの効果は予想することは困難である。 The injection-molded bonded magnet has a feature that it can cope with a complicated shape as compared with a sintered magnet or a compression-molded magnet. It is an important technical problem to improve the material fluidity in order to bring out the characteristics further, and various studies have been made on the surface treatment of ferrite used in the resin composition for ferrite bonded magnets. For example, Patent Document 2 discloses a technique for treating the surface of ferrite with carbonic acid. The purpose of the carbonic acid treatment disclosed therein is to replace the carbon dioxide gas with ferrite instead of overtaking the so-called aging process in which carbon dioxide in the atmosphere is adsorbed and stabilized over time after the production of ferrite. It is to stabilize more efficiently by forcibly contacting the surface. Therefore, treating the ferrite surface with another type of acid, such as a phosphoric acid compound, is a completely different technical idea, and by adopting another acid instead of carbonic acid, the resin composite material was dried. It is difficult to predict the effect of improving the fluidity lowering phenomenon that occurs sometimes and the effect of improving the mechanical strength and water resistance of molded products.
一方、希土類系ボンド磁石用樹脂複合材料に使用される希土類系金属磁性粉の表面処理方法として、リン酸化合物を採用することが提案されている。たとえば特許文献３には、希土類系磁性粉末、フェライト 磁性粉末、及び樹脂 バインダーからなる希土類ハイブリッド磁石用組成物において、使用される希土類系磁性粉末が燐酸 塩系化合物、シラン系カップリング剤、アルミニウム系カップリング剤、及びチタネート系カップリング剤からなる群より選ばれる少なくとも１種の表面処理剤で表面処理されていることを特徴とする希土類ハイブリッド磁石用組成物について開示されている。しかし、処理される対象は希土類系磁性粉末のみであり、これは希土類系磁性粉末が金属であることに由来する課題の解決が目的であり、リン酸処理は希土類磁性粉末などの金属フィラーを樹脂複合材料にする際に特別に有効な処理であると考えられる。一方、フェライトなど金属酸化物においては、金属系に比較して化学的に非常に安定であるためにそのような課題は発生しにくいと考えられる。たとえ希土類磁性粉末とフェライト磁性粉末両方使用するハイブリッド磁石用組成物の原料としてフェライト磁性粉末が使用される場合でさえ、フェライト磁性粉末に対しては燐酸化合物による表面処理がなされていない。従って、これらの文献で開示されている技術をフェライトなど金属酸化物磁性粉末の表面処理へ応用しようとする動機が見当たらない。 On the other hand, it has been proposed to employ a phosphoric acid compound as a surface treatment method for the rare earth metal magnetic powder used in the resin composite material for rare earth bond magnets. For example, in Patent Document 3, in a rare earth hybrid magnet composition comprising a rare earth magnetic powder, a ferrite magnetic powder, and a resin binder, the rare earth magnetic powder used is a phosphate compound, a silane coupling agent, an aluminum-based compound. A composition for a rare earth hybrid magnet characterized in that it is surface-treated with at least one surface treatment agent selected from the group consisting of a coupling agent and a titanate coupling agent. However, the object to be treated is only rare earth magnetic powder, which is intended to solve the problems caused by the rare earth magnetic powder being a metal. Phosphoric acid treatment uses a metal filler such as rare earth magnetic powder as a resin. This is considered to be a particularly effective treatment when making a composite material. On the other hand, in metal oxides such as ferrite, it is considered that such problems are unlikely to occur because they are chemically very stable as compared with metal-based materials. Even when ferrite magnetic powder is used as a raw material of a composition for a hybrid magnet using both rare earth magnetic powder and ferrite magnetic powder, the ferrite magnetic powder is not surface-treated with a phosphoric acid compound. Therefore, there is no motivation to apply the techniques disclosed in these documents to the surface treatment of metal oxide magnetic powder such as ferrite.
さらに、リン酸処理を施した希土類磁性粉を使用した樹脂複合材料組成物を乾燥した時に流動性が低下するという課題について全く記載がなく、さらにリン酸処理によって樹脂組成物の乾燥後の流動性低下を防ぐ効果については、それを示唆する内容も見られない。
本発明は、高い磁気特性を得るためにフェライトを高密度に配合しても、機械強度に優れ、高い材料流動性を示し、さらに乾燥しても流動性の低下が小さいボンド磁石用樹脂複合材料を提供することである。また、吸湿による強度、寸法の変化が小さいといった耐水性の高いボンド磁石を提供することを目的とする。さらに、金属部品と一体成型してもクラックが発生しにくいボンド磁石用樹脂複合材料を提供するものである。 The present invention provides a resin composite material for bonded magnets that has excellent mechanical strength, high material flowability, and low decrease in flowability even when dried, even when ferrite is blended at a high density to obtain high magnetic properties. Is to provide. It is another object of the present invention to provide a bonded magnet with high water resistance such that the change in strength and dimensions due to moisture absorption is small. Furthermore, the present invention provides a resin composite material for bonded magnets that is unlikely to generate cracks even when integrally molded with metal parts.
一般的にボンド磁石用樹脂材料は、保管中に空気中の水分を吸収してしまうために、その使用に際して８０〜１２０℃程度で１〜３時間程度の予備乾燥が行われる。しかし、特にフェライトボンド磁石用複合材料では乾燥時間を長くしすぎたり、乾燥を繰り返したり、乾燥温度を必要以上に高く設定するなどの操作によって樹脂複合材料を過乾燥状態にすると、樹脂複合材料の流動性が低下してしまい、材料加工性が著しく損なわれるといった品質上の問題があった。 Generally, since the resin material for bonded magnets absorbs moisture in the air during storage, pre-drying is performed at about 80 to 120 ° C. for about 1 to 3 hours. However, especially in the case of composite materials for ferrite bonded magnets, if the resin composite material is overdried by operations such as excessively long drying time, repeated drying, or setting the drying temperature higher than necessary, the resin composite material There is a problem in quality that the fluidity is lowered and the material workability is significantly impaired.
また、成型品が直接水に接触する様な用途に使用される場合には、成型品が水を含んで膨潤し、寸法が大きく変化してしまうという問題があった。また、膨潤によって成型品の機械強度が著しく低下するという問題もあった。例えば、ポンプ用で使用されるリング形状のボンド磁石用複合材料において圧環強度が大幅に低下してしまう。 In addition, when the molded product is used for an application in which the molded product is in direct contact with water, there is a problem that the molded product swells with water and the dimensions greatly change. In addition, there is a problem that the mechanical strength of the molded product is significantly reduced by swelling. For example, in a ring-shaped bonded magnet composite material used for a pump, the crushing strength is greatly reduced.
また、大型の射出成型機により成型を行う場合には、成型機内での材料滞留時間が長くなる。滞留することで材料の熱劣化が起こり、熱劣化により成型品の引張強度やひずみなどの機械的物性が著しく低下し、成型品にクラックが発生するという問題もあった。 Further, when molding is performed by a large injection molding machine, the material residence time in the molding machine becomes long. The residence causes thermal deterioration of the material, which causes a problem that mechanical properties such as tensile strength and strain of the molded product are remarkably lowered due to the thermal degradation, and cracks are generated in the molded product.
本発明は、上記課題を解決するために、使用されるフェライトへの表面処理方法を広範に調査した結果、使用されるフェライトをリン酸化合物で表面処理することによって、得られたフェライトボンド磁石用樹脂組成物の流動性が著しく向上し、さらにその樹脂複合材料を射出成型して得られたフェライトボンド磁石の機械強度、耐水性、成型時の滞留による熱劣化が著しく向上することを見いだし、本発明を完成するに至った。 In order to solve the above-mentioned problems, the present invention has extensively investigated the surface treatment methods for ferrite used, and as a result, the ferrite used is obtained by subjecting the ferrite used to a surface treatment with a phosphoric acid compound. The fluidity of the resin composition is remarkably improved, and the mechanical strength, water resistance, and thermal deterioration due to retention during molding of the ferrite bonded magnet obtained by injection molding the resin composite material are found to be significantly improved. The invention has been completed.
本発明の構成に関して詳しく説明する。 The configuration of the present invention will be described in detail.
本発明においてフェライトの表面処理に使用されるリン酸化合物は、添加する際にはリン酸塩の形で添加しても良く、表面処理の過程でリン酸化合物イオンが溶液中で解離して実質的に酸として反応するものであればよい。たとえばリン酸、リン酸アンモニウム、リン酸水素アンモニウム、リン酸二水素アンモニウム、リン酸水素ナトリウムなどが挙げられる。 In the present invention, the phosphate compound used for the surface treatment of ferrite may be added in the form of a phosphate when added, and the phosphate compound ions are substantially dissociated in the solution during the surface treatment. Any substance that reacts as an acid can be used. Examples thereof include phosphoric acid, ammonium phosphate, ammonium hydrogen phosphate, ammonium dihydrogen phosphate, sodium hydrogen phosphate and the like.
リン酸化合物添加量に関しては、曲げ強度のたわみ量が大きくかつ、ＭＦＲが高いため、フェライト１００重量部に対して０．０５〜３．０重量部が好ましい。リン酸化合物の添加量が０．０２質量部以下であると、処理なしの場合と効果がほとんど変わらないため好ましくない。また、添加量５．０重量部以上であると、成型品の機械強度が低下し、ＭＦＲが著しく低くなってしまうため好ましくない。 Regarding the addition amount of the phosphoric acid compound, 0.05 to 3.0 parts by weight is preferable with respect to 100 parts by weight of the ferrite because the flexural strength is large and the MFR is high. It is not preferable that the amount of the phosphoric acid compound added is 0.02 parts by mass or less because the effect is almost the same as that without treatment. Moreover, since the mechanical strength of a molded product falls and MFR becomes remarkably low that it is 5.0 parts weight or more of addition amount, it is unpreferable.
リン酸化合物によるフェライトの表面処理方法に関しては特に限定はなく、例えばミキサーや万能混合機等で十分攪拌するなど、公知の表面処理方法を適宜選択すればよい。できるだけフェライト表面にリン酸化合物が均一に分散するように処理される方法が好ましく、リン酸化合物を水、アルコールなどに溶解、希釈、分散させて使用する方法が挙げられる。また、リン酸化合物を希釈、分散等をせずにそのまま添加してもよい。また、フェライトとリン酸化合物の反応を促進させるために、処理工程で加熱しても良い。必要であればリン酸化合物を添加した後に希釈等の目的で添加した水、アルコール等を除去しても良い。 The surface treatment method of ferrite with a phosphoric acid compound is not particularly limited, and a known surface treatment method may be selected as appropriate, for example, sufficient stirring with a mixer or a universal mixer. A method in which the phosphoric acid compound is uniformly dispersed on the ferrite surface as much as possible is preferable, and a method in which the phosphoric acid compound is dissolved, diluted, or dispersed in water, alcohol or the like is used. Further, the phosphoric acid compound may be added as it is without being diluted or dispersed. Moreover, in order to accelerate | stimulate reaction of a ferrite and a phosphoric acid compound, you may heat at a process process. If necessary, after adding a phosphoric acid compound, water, alcohol, or the like added for the purpose of dilution or the like may be removed.
本発明で用いられるフェライトには特に限定はなく、磁気特性の点でストロンチウムフェライト、バリウムフェライト、ランタンコバルト系フェライトなど磁気特性の高いフェライトが好ましい。これらのフェライトは単体で用いることも、２種類以上を組み合わせても良い。 The ferrite used in the present invention is not particularly limited, and ferrite having high magnetic properties such as strontium ferrite, barium ferrite, and lanthanum cobalt ferrite is preferable in terms of magnetic properties. These ferrites may be used alone or in combination of two or more.
本発明においてフェライトの充填率には特に限定はなく、樹脂複合材料組成物を乾燥した時の流動性低下抑制効果、耐熱性向上効果、耐水性向上効果が見られる。 In the present invention, the filling rate of ferrite is not particularly limited, and an effect of suppressing a decrease in fluidity, an effect of improving heat resistance, and an effect of improving water resistance when a resin composite material composition is dried are observed.
ただし、充填率が８８重量％以下の場合には、特に何ら処理を施していない従来のフェライトボンド磁石用樹脂複合材料においても十分に機械強度が高いために、成型品の機械強度が問題になりにくいという事情から、本発明における曲げたわみ量が大きくなる効果が見られにくくなる。従って、曲げたたわみ量向上効果に注目すると、フェライト充填率は８８重量％以上が好ましい。さらに、エアコンファンモーター用のボンドマグネットの材料にはストロンチウムフェライトとポリアミド１２からなる樹脂複合材料が一般的に使用され、その磁気特性１６ｋＪ／ｍ３以上であるため、これに相当するストロンチウムフェライト充填率は９０重量％以上であるため、この領域で強度が上がることは品質上の好ましい。 However, when the filling rate is 88% by weight or less, the mechanical strength of the molded product becomes a problem because the mechanical strength is sufficiently high even in the conventional resin composite material for ferrite bonded magnet that is not subjected to any treatment. Due to the difficulty, it is difficult to see the effect of increasing the amount of bending deflection in the present invention. Therefore, paying attention to the bending deflection improvement effect, the ferrite filling rate is preferably 88% by weight or more. Furthermore, a resin composite material composed of strontium ferrite and polyamide 12 is generally used as a material for a bond magnet for an air conditioner fan motor, and its magnetic property is 16 kJ / m3 or more. Therefore, the corresponding strontium ferrite filling rate is Since it is 90% by weight or more, it is preferable in terms of quality to increase the strength in this region.
本発明においては、必要に応じてリン酸化合物で処理したフェライトにさらに表面処理を行っても良い。流動性向上などの目的で各種カップリング剤が選択できる。たとえばアミノシラン系、エポキシシラン系、メルカプトシラン系やチタネート系、アルミネート系など使用でき、使用するカップリング剤は、樹脂や添加物やリン酸化合物の種類とのの組み合わせにより適宜選択すればよい。 In the present invention, if necessary, the ferrite treated with the phosphate compound may be further subjected to a surface treatment. Various coupling agents can be selected for the purpose of improving fluidity. For example, aminosilane-based, epoxysilane-based, mercaptosilane-based, titanate-based, aluminate-based, and the like can be used, and the coupling agent to be used may be appropriately selected depending on the combination of the resin, additive, and phosphate compound.
リン酸化合物処理と他の表面処理を併用する場合には、リン酸化合物による表面処理を先に行うことが好ましく、リン酸化合物処理に引き続き、連続してカップリング処理を行っても良い。また、リン酸化合物で処理したあとにカップリング処理を行う場合には、リン酸化合物処理後に乾燥を行ってからカップリング処理を行っても良い。 When the phosphoric acid compound treatment and other surface treatment are used in combination, the surface treatment with the phosphoric acid compound is preferably performed first, and the coupling treatment may be performed continuously following the phosphoric acid compound treatment. Further, when the coupling treatment is performed after the treatment with the phosphoric acid compound, the coupling treatment may be performed after drying after the phosphoric acid compound treatment.
本発明で用いられる熱可塑性樹脂は特に限定されるものではなく、ポリエチレン、ポリプロピレン、ポリスチレン、ポリアミド、ポリエステル、ＰＰＳ、ＬＣＰ等が例示される。特にポリアミド６、ポリアミド１２、脂肪酸アミド、熱可塑性エラストマー、ＰＰＳ及びこれらの共重合体等が流動性、機械強度などの点で好ましい。これらの熱可塑性樹脂は単体で用いることも、２種類以上を併用することもできる。 The thermoplastic resin used in the present invention is not particularly limited, and examples thereof include polyethylene, polypropylene, polystyrene, polyamide, polyester, PPS, and LCP. In particular, polyamide 6, polyamide 12, fatty acid amide, thermoplastic elastomer, PPS, and copolymers thereof are preferable in terms of fluidity and mechanical strength. These thermoplastic resins can be used alone or in combination of two or more.
特にポリアミド、または熱可塑性エラストマーとポリアミドの組み合わせた物は、金属部品と一体成型されたボンド磁石に使用される場合が多く、たわみ量の向上効果が実用上有利となるため好ましい。ファンモーター等に使用されるフェライトボンド磁石に使用される樹脂はポリアミド１２が最も一般的であり、ファンモーター等に使用されるフェライトボンド磁石のクラック発生問題を解決できるという実用上の理由から、ポリアミド１２を使用したものがさらに好ましい。 In particular, a polyamide or a combination of a thermoplastic elastomer and a polyamide is often used for a bonded magnet integrally molded with a metal part, and is preferable because the effect of improving the amount of deflection is practically advantageous. Polyamide 12 is the most common resin used for ferrite bond magnets used in fan motors and the like. For practical reasons, it can solve the cracking problem of ferrite bond magnets used in fan motors and the like. More preferably, 12 is used.
本発明においては必要に応じて、各種添加剤を用いても良い。たとえば、目的に応じて滑剤や酸化防止剤、可塑剤等を添加することができる。例えば、滑剤としては脂肪酸系、ワックスなどが挙げられ、可塑剤としてはステアリルアルコール等の高級脂肪族アルコール系滑剤、ステアリン酸等の高級脂肪酸系滑剤、エチレンビスステアリン酸アマイド等の脂肪酸アマイド系などが挙げられる。酸化防止剤としては、ヒンダートフェノール系、アミン系等の酸化防止剤が挙げられる。これらは単体で用いることも、２種類以上を併用することもできる。 In the present invention, various additives may be used as necessary. For example, a lubricant, an antioxidant, a plasticizer, or the like can be added depending on the purpose. Examples of the lubricant include fatty acid-based waxes and the like, and plasticizers include higher aliphatic alcohol-based lubricants such as stearyl alcohol, higher fatty acid-based lubricants such as stearic acid, and fatty acid amides such as ethylenebisstearic acid amide. Can be mentioned. Examples of the antioxidant include hindered phenol type and amine type antioxidants. These can be used alone or in combination of two or more.
本発明は上述した構成により、以下に記載する効果を奏するものである。 The present invention achieves the effects described below with the above-described configuration.
フェライト充填率に関係なく、乾燥しても流動性の低下が小さい樹脂複合材料が得られるものである。また、フェライトを８８重量％以上に高充填化しても、流動性の高い樹脂複合材料が得られる。また、その樹脂複合材料により成型した成型品は、曲げたわみ量が大きく、高い耐水性、耐熱性を示すものである。 Regardless of the ferrite filling rate, a resin composite material having a small decrease in fluidity even when dried can be obtained. Moreover, even if the ferrite content is increased to 88% by weight or more, a resin composite material having high fluidity can be obtained. Further, a molded product molded from the resin composite material has a large amount of bending deflection and exhibits high water resistance and heat resistance.
本発明について、実施例を用いてさらに詳細に説明してゆく。
1．フェライトの弱酸による表面処理
処理するストロンチウムフェライト１００重量部に対して５重量部のイソプロピルアルコールに希釈された弱酸を表１、表２、表３、表４に示された弱酸処理欄に示された重量比で計量し、１００重量部のストロンチウムフェライトへ添加して、万能混合機で攪拌した。引き続き弱酸で処理されたストロンチウムフェライトへ、同量の水で希釈したアミノシランカップリング剤溶液を２重量部添加し、これらの混合物を１００℃まで攪拌しながら加熱して、表面処理済フェライトを得た。
比較例の場合の表面処理は本発明と同様の方法で、弱酸処理を行わず表面処理を実施して表面処理済フェライトを得た。
The present invention will be described in further detail using examples.
1． The weak acid diluted in 5 parts by weight of isopropyl alcohol with respect to 100 parts by weight of strontium ferrite to be surface-treated with a weak acid of ferrite is shown in the weak acid treatment column shown in Table 1, Table 2, Table 3, and Table 4. Weighed by weight, added to 100 parts by weight of strontium ferrite and stirred with a universal mixer. Subsequently, 2 parts by weight of an aminosilane coupling agent solution diluted with the same amount of water was added to strontium ferrite treated with a weak acid, and the mixture was heated to 100 ° C. with stirring to obtain surface-treated ferrite. .
The surface treatment in the case of the comparative example was performed in the same manner as in the present invention, and the surface treatment was performed without performing the weak acid treatment to obtain a surface-treated ferrite.
２．樹脂複合材料の製造
比較例１，２，３，４，５，８，９，１０，１１，１２、実施例１，２，３，４，７，８，９，１０，１１，１２については表面処理済フェライト９０重量部に対して、ポリアミド１２を１０重量部計量して添加した。
比較例６，７、実施例５，６については表面処理済みフェライト８５重量部に対してポリアミド１２を１５重量部計量して添加した。どの樹脂複合材料も万能混合機で均一に攪拌し、得られた混合物は２軸押出機を使用して混練を行い、フェライトボンド磁石用樹脂複合材料を得た。押出機の設定温度は２５０℃とした。
2. Production Comparative Examples 1, 2, 3, 4, 5, 8, 9, 10, 11, 12 and Examples 1, 2, 3, 4, 7, 8, 9, 10, 11, 12 of Resin Composite Materials 10 parts by weight of polyamide 12 was weighed and added to 90 parts by weight of the surface-treated ferrite.
In Comparative Examples 6 and 7, and Examples 5 and 6, 15 parts by weight of polyamide 12 was weighed and added to 85 parts by weight of surface-treated ferrite. All the resin composite materials were uniformly stirred with a universal mixer, and the resulting mixture was kneaded using a twin screw extruder to obtain a resin composite material for a ferrite bonded magnet. The set temperature of the extruder was 250 ° C.
３．樹脂複合材料の流動性評価
ボンド磁石用樹脂複合材料の流動性の評価はメルトインデクサーＡＳＴＭ Ｄ−１２３８によりＭＦＲを測定した。測定条件は温度２７０℃、荷重１０ｋｇで行った。ボンド磁石用樹脂複合材料を過乾燥した場合の流動性評の低下度合いを評価するために、熱風乾燥機内温度１２０℃で２時間保持した後のＭＦＲを前記条件でＭＦＲを測定し、乾燥ＭＦＲとした。
3. Evaluation of fluidity of resin composite material Evaluation of the fluidity of the resin composite material for bonded magnets was performed by measuring MFR with a melt indexer ASTM D-1238. The measurement conditions were a temperature of 270 ° C. and a load of 10 kg. In order to evaluate the degree of decrease in fluidity rating when the resin composite material for bonded magnets is overdried, the MFR after holding for 2 hours at a temperature of 120 ° C. in the hot air dryer is measured under the above conditions, and the dry MFR did.
４．樹脂複合材料の機械強度評価
前記工程により得られたボンド磁石用樹脂複合材料をJSW製のJ５０ＭＥ２成型機を用いて、シリンダー温度２８０℃、ノズル温度２７０℃、金型温度８０℃で磁場中で射出成型して、機械強度の評価試験片（長さ７６０mm、幅１２．７mm、厚み３．３mm）を作製した。
機械強度の評価は試験機 ＡＧＳ−Ｈ（島津製作所）で曲げ強度と曲げたわみ量を測定した。測定条件は、温度２３℃、ヘッドスピード５ｍｍ／ｍｉｎで行った。評価結果を表１に示す。
4). Evaluation of mechanical strength of resin composite material The resin composite material for bonded magnets obtained in the above process was injected in a magnetic field at a cylinder temperature of 280 ° C, a nozzle temperature of 270 ° C, and a mold temperature of 80 ° C using a J50 J50ME2 molding machine. Molding was performed to prepare a mechanical strength evaluation test piece (length: 760 mm, width: 12.7 mm, thickness: 3.3 mm).
The mechanical strength was evaluated by measuring the bending strength and the amount of bending deflection with a testing machine AGS-H (Shimadzu Corporation). The measurement conditions were a temperature of 23 ° C. and a head speed of 5 mm / min. The evaluation results are shown in Table 1.
比較例１は弱酸添加無し，比較例２，３は弱酸にそれぞれ酢酸、希塩酸を用いて同様な処理を行った。酢酸、希塩酸を弱酸として用いて処理を行うとたわみ量、ＭＦＲともに低下し、効果がないと言える。 In Comparative Example 1, no weak acid was added, and in Comparative Examples 2 and 3, the same treatment was performed using acetic acid and dilute hydrochloric acid as weak acids, respectively. When the treatment is performed using acetic acid or dilute hydrochloric acid as a weak acid, both the deflection amount and the MFR decrease, and it can be said that there is no effect.
実施例１，２，３，４、比較例４，５は弱酸にオルトリン酸を用いて同様な処理を行った。添加量が０．０２重量部では比較例１とほとんど差がなく、効果が見られない。また、比較例５より添加量が５．０重量部ではたわみ量が１．３ｍｍと大きく低下し、ＭＦＲについても非常に低い値であったことから、基礎的な物性を満足できず好ましくない。添加量は０．０５重量部〜３．０重量部が好ましいと言える。また添加量０．３０重量部〜１．０重量部ではたわみ量：２０〜３０％、ＭＦＲ：３０〜５０％高い結果となり、特に好ましい。このことから、オルトリン酸を添加することにより、酢酸、希塩酸と比べ大きな効果が得られると言える。 In Examples 1, 2, 3, 4 and Comparative Examples 4 and 5, the same treatment was performed using orthophosphoric acid as the weak acid. When the addition amount is 0.02 part by weight, there is almost no difference from Comparative Example 1, and no effect is seen. Further, when the added amount is 5.0 parts by weight as compared with Comparative Example 5, the amount of deflection is greatly reduced to 1.3 mm, and the MFR is also a very low value. It can be said that the addition amount is preferably 0.05 to 3.0 parts by weight. Further, when the addition amount is 0.30 parts by weight to 1.0 part by weight, the deflection amount is 20 to 30% and the MFR is 30 to 50% higher, which is particularly preferable. From this, it can be said that the addition of orthophosphoric acid provides a greater effect than acetic acid and dilute hydrochloric acid.
比較例1は乾燥時のＭＦＲ低下率が約４０％であるのに対し、実施例１〜４では約１５％程度の低下率となっている。このことから、本発明により射出用複合材料を乾燥した状態においても、材料流動性の低下を抑制する効果が認められた。 In Comparative Example 1, the MFR reduction rate during drying is about 40%, while in Examples 1 to 4, the reduction rate is about 15%. From this, even when the injection composite material was dried according to the present invention, the effect of suppressing the decrease in material fluidity was recognized.
５．樹脂複合材料の膨潤評価
蒸留水にフェライトボンド磁石用複合材料で射出成型して作製した成型体をビーカーに入れ、これをガラス製デシケーター内で１００℃、２４時間保持した。
テスト用成型体は前記工程により得られたボンド磁石用樹脂複合材料をＪＳＷ製のＪ５０ＭＥ２成型機を用いて、シリンダー温度２８０℃、ノズル温度２７０℃、金型温度８０℃で磁場中で射出成型したリング形状成型体(外径：２３．４５ｍｍ、内径：１９０ｍｍ、高さ：８．１０ｍｍ)を使用した。また、比較として大気中で保持した場合のテストも実施した。圧環強度の評価は試験機 ＡＧＳ−Ｈ（島津製作所）で測定した。測定条件は、温度２３℃、ヘッドスピード５ｍｍ／ｍｉｎで行った。評価結果を表2に示す。
5). Evaluation of Swelling of Resin Composite Material A molded body produced by injection molding with a composite material for ferrite bonded magnets in distilled water was placed in a beaker and held in a glass desiccator at 100 ° C. for 24 hours.
The molded body for test was injection molded in a magnetic field at a cylinder temperature of 280 ° C., a nozzle temperature of 270 ° C., and a mold temperature of 80 ° C. using a J50ME2 molding machine manufactured by JSW. A ring-shaped molded body (outer diameter: 23.45 mm, inner diameter: 190 mm, height: 8.10 mm) was used. For comparison, a test was also conducted when kept in the atmosphere. Evaluation of the crushing strength was measured with a testing machine AGS-H (Shimadzu Corporation). The measurement conditions were a temperature of 23 ° C. and a head speed of 5 mm / min. The evaluation results are shown in Table 2.
比較例６、実施例５より、大気中に２４hr保持した時の成型寸法変化はどちらも同じである。しかし、実施例６は比較例７に比べ重量変化が約１／２倍であり、比較例５は吸湿による膨潤を抑制できていることが分かる。この両サンプルの圧環強度最大試験力はほとんど同じであり、本発明によって耐水性の向上が確認できたと言える。 From Comparative Example 6 and Example 5, the change in molding dimension is the same when held in the atmosphere for 24 hours. However, the weight change of Example 6 is about 1/2 times that of Comparative Example 7, and it can be seen that Comparative Example 5 can suppress swelling due to moisture absorption. The crushing strength maximum test force of both samples is almost the same, and it can be said that the improvement in water resistance was confirmed by the present invention.
実施例６は比較例７に比べ寸法、重量変化が小さく圧環強度最大試験力も低下が大きい。このことから、本発明により、膨潤を防ぎ、圧環強度の低下を抑制できると言える。 Example 6 is smaller in size and weight than Comparative Example 7, and has a large decrease in the crushing strength maximum test force. From this, it can be said that the present invention can prevent swelling and suppress the reduction of the crushing strength.
６．樹脂複合材料の熱滞留評価
滞留試験は前記工程により得られたボンド磁石用樹脂複合材料をJSW製のＪ５０ＭＥ２成型機を用いて材料を計量した後、一定時間保持してから射出成型を行い、その保持時間を変更し(３０、３００、６００、９００sec)得られた成型品の強度を比較した。成型はシリンダー温度２８０℃、ノズル温度２７０℃、金型温度８０℃で磁場中で射出成型し、引張強度の評価試験片（長さ１２７mm、幅１３mm、厚み３．２mm）を作製した。引張強度の評価は試験機 ＡＧＳ−Ｈ（島津製作所）で測定した。測定条件は、温度２３℃、ヘッドスピード５ｍｍ／ｍｉｎで行った。評価結果を表３に示す。表３において引張強度の低下率は滞留時間が３０ｓｅｃを基準として算出した。
6). Thermal residence evaluation of resin composite material The residence test was performed by measuring the material of the resin composite material for bonded magnet obtained by the above process using a JSW J50ME2 molding machine, holding it for a certain period of time, and then performing injection molding. The holding time was changed (30, 300, 600, 900 sec), and the strengths of the obtained molded products were compared. Molding was performed by injection molding in a magnetic field at a cylinder temperature of 280 ° C., a nozzle temperature of 270 ° C., and a mold temperature of 80 ° C. to produce tensile strength evaluation test pieces (length 127 mm, width 13 mm, thickness 3.2 mm). Evaluation of tensile strength was measured with a testing machine AGS-H (Shimadzu Corporation). The measurement conditions were a temperature of 23 ° C. and a head speed of 5 mm / min. The evaluation results are shown in Table 3. In Table 3, the decrease rate of the tensile strength was calculated based on a residence time of 30 sec.
表３より、比較例８では滞留時間９００secで２３．１％の引張強度低下に対し、実施例７では８．３％の低下にとどまっている。このことから本発明により、フェライトボンド磁石用樹脂組成物は成型機内で滞留した場合でも、得られた成型品の強度低下が少なくなっていたことがわかる。比較例８では滞留時間９００secの場合に、引っ張り成型での成型品の変位量が基準条件の３０ｓｅｃの場合に比べて４１．４％の低下に対し、実施例７では３３．６％の低下にとどまっている。このことからも本発明により、フェライトボンド磁石用樹脂組成物は成型機内で滞留した場合のボンド磁石用樹脂複合材料の熱劣化が少なくなっていると言える。以上の結果より、本発明により、樹脂の熱劣化を防ぎ、耐熱性を向上させると言える。 From Table 3, in Comparative Example 8, the decrease in tensile strength was 23.1% at a residence time of 900 sec, whereas in Example 7, the decrease was only 8.3%. From this, it can be seen that, according to the present invention, even when the resin composition for ferrite bonded magnets stays in the molding machine, the strength reduction of the obtained molded product is reduced. In Comparative Example 8, when the residence time is 900 sec, the amount of displacement of the molded product in the tensile molding is 41.4% lower than that in the standard condition of 30 sec, whereas in Example 7, the displacement is 33.6%. It stays. From this, it can be said that according to the present invention, the resin composition for ferrite bonded magnets is less subject to thermal deterioration of the resin composite material for bonded magnets when retained in the molding machine. From the above results, it can be said that the present invention prevents thermal deterioration of the resin and improves heat resistance.
７．複合材料の耐クラック評価
金属部材との一体成型品を１０個用意し、ヒートショック試験を行った。金属部材は直径３０mm、高さ１５mmの円筒形珪素鋼板を用い、直径５３mm、高さ２４mmの樹脂複合材料にインサート成型した。ヒートショック試験条件は−４０℃および１２０℃で各３０分間保持する工程を１サイクルとして１００サイクル行った。ヒートショック試験後、成型品を目視観察によりクラック発生の有無を確認した。表７のクラック数はクラック発生の見られた成型品の数を表している。
7). Ten integrated molded products with a metal member for evaluation of crack resistance of composite materials were prepared and subjected to a heat shock test. The metal member was a cylindrical silicon steel plate having a diameter of 30 mm and a height of 15 mm, and was insert-molded into a resin composite material having a diameter of 53 mm and a height of 24 mm. The heat shock test conditions were carried out for 100 cycles, with the step of holding at −40 ° C. and 120 ° C. for 30 minutes each as one cycle. After the heat shock test, the molded product was visually checked for cracks. The number of cracks in Table 7 represents the number of molded products in which cracks were observed.
弱酸処理剤としてオルトリン酸を添加している実施例１０，１１，１２においてクラックの発生は確認できなかった。このことから、本発明により金属部材との一体成型をした際の耐クラック性が向上すると言える。 In Examples 10, 11, and 12 in which orthophosphoric acid was added as a weak acid treatment agent, the occurrence of cracks could not be confirmed. From this, it can be said that the crack resistance when integrally molded with the metal member is improved according to the present invention.
本発明は、フェライトボンド磁石用樹脂複合材料の高特性化による小型化や、金属部材との一体成型による工数削減などが可能であるため、産業上の利用可能性を有する。
The present invention has industrial applicability because it is possible to reduce the size of the resin composite material for ferrite bonded magnets by reducing the characteristics and to reduce the number of steps by integrally molding with a metal member.
Claims (3)
3. A bonded magnet molded product comprising the resin composite material for injection molding according to claim 1 or 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006109281A JP2007281381A (en) | 2006-04-12 | 2006-04-12 | Resin composite material for ferrite bond magnet, and bond magnet molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006109281A JP2007281381A (en) | 2006-04-12 | 2006-04-12 | Resin composite material for ferrite bond magnet, and bond magnet molding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2007281381A true JP2007281381A (en) | 2007-10-25 |
Family
ID=38682496
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2006109281A Pending JP2007281381A (en) | 2006-04-12 | 2006-04-12 | Resin composite material for ferrite bond magnet, and bond magnet molding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2007281381A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008126352A1 (en) | 2007-03-14 | 2008-10-23 | Toda Kogyo Corporation | Ferrite powder for bonded magnet, resin composition for bonded magnet, and molded body made of those |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0493002A (en) * | 1990-08-09 | 1992-03-25 | Kawasaki Steel Corp | Manufacture of bond magnet molding material |
| JPH11307332A (en) * | 1998-04-21 | 1999-11-05 | Bridgestone Corp | Magnet molding and magnet roller |
| JP2002110411A (en) * | 2000-09-27 | 2002-04-12 | Sumitomo Metal Mining Co Ltd | Composition for rare earth hybrid magnet and magnet using the same |
| JP2002110412A (en) * | 2000-09-27 | 2002-04-12 | Sumitomo Metal Mining Co Ltd | Composition for rare earth hybrid magnet and magnet using the same |
| JP2003142307A (en) * | 2001-11-07 | 2003-05-16 | Sumitomo Metal Mining Co Ltd | Composition for resin-bonded magnet and resin-bonded magnet using the same |
-
2006
- 2006-04-12 JP JP2006109281A patent/JP2007281381A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0493002A (en) * | 1990-08-09 | 1992-03-25 | Kawasaki Steel Corp | Manufacture of bond magnet molding material |
| JPH11307332A (en) * | 1998-04-21 | 1999-11-05 | Bridgestone Corp | Magnet molding and magnet roller |
| JP2002110411A (en) * | 2000-09-27 | 2002-04-12 | Sumitomo Metal Mining Co Ltd | Composition for rare earth hybrid magnet and magnet using the same |
| JP2002110412A (en) * | 2000-09-27 | 2002-04-12 | Sumitomo Metal Mining Co Ltd | Composition for rare earth hybrid magnet and magnet using the same |
| JP2003142307A (en) * | 2001-11-07 | 2003-05-16 | Sumitomo Metal Mining Co Ltd | Composition for resin-bonded magnet and resin-bonded magnet using the same |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008126352A1 (en) | 2007-03-14 | 2008-10-23 | Toda Kogyo Corporation | Ferrite powder for bonded magnet, resin composition for bonded magnet, and molded body made of those |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102272230A (en) | High-strength polyphenylene sulfide/polyethylene terephthalate blended resin composition and a production method therefor | |
| JP5670188B2 (en) | Polybutylene terephthalate resin composition and molded article | |
| CN106663512B (en) | Composition for bonded magnet, bonded magnet, and integrally molded part | |
| JP2007281381A (en) | Resin composite material for ferrite bond magnet, and bond magnet molding | |
| JP5388432B2 (en) | Plastic magnet composition | |
| JP5278718B2 (en) | Magnetic rubber molded product and molding method thereof | |
| WO2023120184A1 (en) | Resin composition for bonded magnets and bonded magnets using same | |
| CN101656134A (en) | High temperature resistant bonding rare earth magnet and preparation method thereof | |
| JP2022062149A (en) | Bond magnet compounds, moldings, and bond magnets | |
| WO2025204636A1 (en) | Resin composition for bonded magnet and bonded magnet using same | |
| KR101527563B1 (en) | Supramolecular network thermo-reversible crosslinked elastomer having heat-resistant, chemical-resistance, high mechanical properties | |
| JP7767882B2 (en) | Composition for bonded magnet and bonded magnet | |
| CN120641494A (en) | Soft magnetic resin composition and molded article using the same | |
| JPS6127605A (en) | Flexible permanent magnet | |
| JP2006332431A (en) | Rubber magnet and manufacturing method thereof | |
| JP2003041116A (en) | Polyamide, plastic magnetic material and magnet made from the same | |
| JP2000331812A (en) | Resin bonded rare earth magnet | |
| JP2024084975A (en) | Composition for bonded magnets, bonded magnets, and integrally molded parts | |
| WO2023058565A1 (en) | Resin composition for bonded magnets and molded body using same | |
| JP2004173497A (en) | Plastic magnets for motors made from polyamide plastic magnetic materials | |
| CN121054344A (en) | High-filling high-fluidity high-strength samarium iron nitrogen/polyethylene composite material and preparation method thereof | |
| JP2004221497A (en) | Polyamide-based plastic magnet having metallic part therein | |
| JP2007250603A (en) | Process for producing +rubber magnet component | |
| CN118098805A (en) | Forming method of anisotropic samarium-iron-nitrogen flexible magnet | |
| JP2006156484A (en) | Method of manufacturing rubber magnet composite |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Effective date: 20090407 Free format text: JAPANESE INTERMEDIATE CODE: A621 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20101012 |
|
| A131 | Notification of reasons for refusal |
Effective date: 20101116 Free format text: JAPANESE INTERMEDIATE CODE: A131 |
|
| A02 | Decision of refusal |
Effective date: 20110510 Free format text: JAPANESE INTERMEDIATE CODE: A02 |