JP5360445B2 - ボンド磁石用フェライト粒子粉末、ボンド磁石用樹脂組成物ならびにそれらを用いた成型体 - Google Patents
ボンド磁石用フェライト粒子粉末、ボンド磁石用樹脂組成物ならびにそれらを用いた成型体 Download PDFInfo
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Description
である。(本発明6)。
本発明に係るフェライト粒子粉末の組成は、特に限定されるものではなく、マグネトプランバイト型フェライトであればよく、Sr系フェライト粒子粉末、Ba系フェライト粒子粉末のいずれでもよい。また、La、Nd、Pr、Co、Zn等の異種元素を含有してもよい。
本発明に係るフェライト粒子粉末をかさ密度が0.75g/cm3以下で圧縮度が65%以上に制御することで、本発明のフェライト粒子粉末および/またはボンド磁石用樹脂組成物からなる成型体の引張伸びが優れることについては未だ明らかではないが、本発明者は次のように推定している。
圧縮度=(タップ密度−かさ密度)/タップ密度×100 (%)
<フェライト粒子粉末の製造>
粉末状のα−Fe2O3を100重量部と、SrCO3を15.9重量部(FeとSrのモル比は2Fe:Sr=5.95:1)秤量して、湿式アトライターで30分混合した後、濾過、乾燥した。得られた原料混合粉末にSrCl2・6H2O及びNa2B4O7の水溶液をそれぞれ添加してよく混合した後、造粒した。この時、SrCl2・6H2O及びNa2B4O7の添加量は、上記原料混合粉末に対してそれぞれ5.5重量%、0.5重量%とした。得られた造粒物を大気中1180℃で2時間焼成した。得られた焼成物を粗粉砕した後に、湿式アトライターで30分粉砕し、水洗、濾過、乾燥した。その後、イソプロピルアルコール及びトリエタノールアミンの混合溶液を添加して、更に振動ミルで30分間粉砕した。この時、イソプロピルアルコール及びトリエタノールアミンの添加量は、上記湿式粉砕乾燥品に対してそれぞれ0.2重量%、0.1重量%の混合溶液を添加して、次いで、得られた粉砕物を大気中950℃で1.5時間熱処理した。その後、サンドミルで加重45kg/cmで30分間圧縮・摩砕処理を行い、更にピンミルで解砕処理した。製造条件を表1に、得られたボンドフェライト用磁性粉の特性を表2に示す。
組成、添加剤の種類及び添加量などを種々変化させた以外は、前記発明の実施の形態と同様にしてフェライト粒子粉末を作成した。
製造条件を表1に、得られたボンドフェライト用磁性粉の特性を表2に示す。
前記実施例1、2の熱処理後のフェライト粒子粉末を比較例1、3とした。製造条件を表1に、得られたボンドフェライト用磁性粉の特性を表2に示す。
前記実施例1、2の圧縮・摩砕処理後のフェライト粒子粉末を比較例2、4とした。製造条件を表1に、得られたボンドフェライト用磁性粉の特性を表2に示す。
<ボンド磁石用樹脂組成物の製造>
実施例1で得られたフェライト粒子粉末をヘンシェルミキサーに25000g入れ、アミノアルキル系シランカップリング剤をフェライトに対して0.5wt%添加して20分間均一になるまで混合し、さらに、相対粘度1.60の12−ナイロン樹脂を2817g投入した後、さらに30分間混合してボンド磁石用樹脂組成物の混合物を用意した。
ボンド磁石用樹脂組成物の製法と特性を表3に示す。
実施例2で得られたフェライト粒子粉末と12−ナイロン樹脂、シランカップリング剤からなるボンド磁石用樹脂組成物を12−ナイロン樹脂、シランカップリング剤、離型剤の添加量を種々変化させて前記実施例3と同様にして作成した。
ボンド磁石用樹脂組成物の特性を表3に示す。
種々得られたフェライト粒子粉末と12−ナイロン樹脂、シランカップリング剤からなるボンド磁石用樹脂組成物を前記実施例3と同様にして作成した。
ボンド磁石用樹脂組成物の特性を表3に示す。
種々得られたフェライト粒子粉末と12−ナイロン樹脂、シランカップリング剤からなるボンド磁石用樹脂組成物を前記実施例4と同様にして作成した。
ボンド磁石用樹脂組成物の特性を表3に示す。
<試験片成形体の成形>
実施例3で得られたボンド磁石用樹脂組成物を100℃で3時間乾燥した後、射出成型機においてボンド磁石用樹脂組成物を300℃で溶融し、射出時間0.3秒で80℃に設定された金型に射出成形して、全長175mm、全幅12.5mm、厚み3.2mmの試験片成形体を用意した。試験片成形体の射出性及び諸特性を表4に示す。
実施例4で作成したボンド磁石用樹脂組成物を、溶融温度を280℃にした以外は前記実施例5と同様にして試験片成形体を作成した。試験片成形体の射出性及び諸特性を表4に示す。
種々のボンド磁石用樹脂組成物を用いて、前記実施例5と同様にして試験片成形体を作成した。試験片成形体の射出性及び諸特性を表4に示す。
種々のボンド磁石用樹脂組成物を用いて、前記実施例6と同様にして試験片成形体を作成した。試験片成形体の射出性及び諸特性を表4に示す。
Claims (6)
- かさ密度が0.60〜0.75g/cm 3 であって圧縮度が65〜75%であることを特徴とするボンド磁石用フェライト粒子粉末。
- 平均粒子径が0.9〜3.0μmである請求項1記載のボンド磁石用フェライト粒子粉末。
- マグネトプランバイト型フェライト粒子粉末である請求項1又は2記載のボンド磁石用フェライト粒子粉末。
- 請求項1〜3のいずれかに記載のボンド磁石用フェライト粒子粉末を83重量%から93重量%含有し、有機バインダー成分を7重量%から17重量%含有することを特徴とするボンド磁石用樹脂組成物。
- 請求項1〜3のいずれかに記載のボンド磁石用フェライト粒子粉末、又は請求項4記載のボンド磁石用樹脂組成物のいずれかを用いたことを特徴とする成型体。
- 成型体がロータであることを特徴とする請求項5記載の成型体。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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JP2012079532A JP5360445B2 (ja) | 2012-03-30 | 2012-03-30 | ボンド磁石用フェライト粒子粉末、ボンド磁石用樹脂組成物ならびにそれらを用いた成型体 |
PCT/JP2013/057213 WO2013146299A1 (ja) | 2012-03-30 | 2013-03-14 | ボンド磁石用フェライト粒子粉末、ボンド磁石用樹脂組成物ならびにそれらを用いた成型体 |
KR1020147026187A KR102090346B1 (ko) | 2012-03-30 | 2013-03-14 | 본드 자석용 페라이트 입자 분말, 본드 자석용 수지 조성물 및 그것들을 사용한 성형체 |
CN201380016566.7A CN104205253B (zh) | 2012-03-30 | 2013-03-14 | 粘结磁铁用铁氧体颗粒粉末、粘结磁铁用树脂组合物和使用这些的成型体 |
US14/389,102 US9691528B2 (en) | 2012-03-30 | 2013-03-14 | Ferrite particles for bonded magnets, resin composition for bonded magnets, and molded product using the same |
EP13767468.5A EP2833377B1 (en) | 2012-03-30 | 2013-03-14 | Ferrite particulate powder for bonded magnet, resin composition for bonded magnet, and moldings using same |
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JP2012079532A JP5360445B2 (ja) | 2012-03-30 | 2012-03-30 | ボンド磁石用フェライト粒子粉末、ボンド磁石用樹脂組成物ならびにそれらを用いた成型体 |
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JP2013211351A JP2013211351A (ja) | 2013-10-10 |
JP5360445B2 true JP5360445B2 (ja) | 2013-12-04 |
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US (1) | US9691528B2 (ja) |
EP (1) | EP2833377B1 (ja) |
JP (1) | JP5360445B2 (ja) |
KR (1) | KR102090346B1 (ja) |
CN (1) | CN104205253B (ja) |
WO (1) | WO2013146299A1 (ja) |
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JP5360445B2 (ja) | 2012-03-30 | 2013-12-04 | 戸田工業株式会社 | ボンド磁石用フェライト粒子粉末、ボンド磁石用樹脂組成物ならびにそれらを用いた成型体 |
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CN104205253B (zh) | 2017-08-01 |
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