JP2010033687A - 磁気記録媒体の非磁性下地層用非磁性粒子粉末の製造方法、及び磁気記録媒体 - Google Patents
磁気記録媒体の非磁性下地層用非磁性粒子粉末の製造方法、及び磁気記録媒体 Download PDFInfo
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- JP2010033687A JP2010033687A JP2008287070A JP2008287070A JP2010033687A JP 2010033687 A JP2010033687 A JP 2010033687A JP 2008287070 A JP2008287070 A JP 2008287070A JP 2008287070 A JP2008287070 A JP 2008287070A JP 2010033687 A JP2010033687 A JP 2010033687A
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- particle powder
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- particles
- hematite
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/22—Compounds of iron
- C09C1/24—Oxides of iron
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/02—Oxides; Hydroxides
- C01G49/06—Ferric oxide [Fe2O3]
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/73—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer
- G11B5/733—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer characterised by the addition of non-magnetic particles
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
- Compounds Of Iron (AREA)
- Magnetic Record Carriers (AREA)
Abstract
【解決手段】 ゲータイト粒子を含む含液物を真空凍結乾燥した後に、該乾燥物を熱処理してヘマタイト粒子粉末とするか、必要により、ヘマタイト粒子粉末の粒子表面を、アルミニウムの水酸化物などの表面被覆物によって被覆、もしくは更に真空凍結乾燥を行うことで、粒子同士の凝結が少なく、ビヒクル中で分散しやすい非磁性下地層用非磁性粒子粉末を得るための製造方法である。
【選択図】 なし
Description
本発明において最も重要な点は、ゲータイト粒子粉末を含む含液物を真空凍結乾燥した後に、該乾燥物を熱処理することによって得られた非磁性下地層用ヘマタイト粒子粉末は、粒子同士の焼結が少なく、これを用いて得られる磁気記録媒体は、非磁性下地層を薄層化しても、テープの表面平滑性が良好で、ドロップアウトが少ないという事実である。
硫酸第一鉄水溶液と、水酸化ナトリウムと炭酸ナトリウムの混合水溶液とを用いて得られた前駆体1(種類:ゲータイト粒子、粒子形状:紡錘状、平均一次長軸径:0.130μm、平均一次短軸径:0.0170μm、軸比:7.6、BET比表面積値:145.4m2/g、体積基準平均粒子径D50:3.75μm、アルミニウムの含有量(Al換算):0.05重量%)17kgのスラリー(固形分濃度を31g/l)550lを加熱し、温度を60℃とし、0.1NのNaOH水溶液を加えてスラリーのpH値を10.0に調整した。
上記実施例1−1で得られたヘマタイト粒子12kgを、凝集を解きほぐすために、純水70lに攪拌機を用いて邂逅し、更に、「TKパイプラインホモミクサー」(製品名、特殊機化工業株式会社製)を3回通して実施例1−1のヘマタイト粒子粉末を含むスラリーを得た。
次に、上記実施例2−1の濾別、水洗後(乾燥前)のヘマタイト粒子粉末を含む含水物(固形分濃度で29重量%)を、−50℃にて完全に凍結させ、凍結後、真空度を50Paにまであげて、その状態から徐々に温度を上げて60℃にした後に、水分が0.5%以下になるまで乾燥を行った。この乾燥粉末 10.0kgをエッジランナー「MPUV−2型」(製品名、株式会社松本鋳造鉄工所製)に投入して、392N/cmで20分間混合攪拌を行い、粒子の凝集を軽く解きほぐし、実施例3−1の非磁性下地層用非磁性粒子粉末を得た。
前記実施例1−1の非磁性下地層用非磁性粒子粉末12gと結合剤樹脂溶液(スルホン酸カリウム基を有する塩化ビニル系共重合樹脂30重量%とシクロヘキサノン70重量%)及びシクロヘキサノンとを混合し、自動乳鉢を用いて30分間混練して混練物を得た。
スルホン酸カリウム基を有する塩化ビニル系共重合樹脂 11.8重量部、
スルホン酸ナトリウム基を有するポリウレタン樹脂 11.8重量部、
シクロヘキサノン 78.3重量部、
メチルエチルケトン 195.8重量部、
トルエン 117.5重量部、
硬化剤(ポリイソシアネート) 3.0重量部、
潤滑剤(ブチルステアレート) 1.0重量部。
磁性粒子(1)(種類:鉄を主成分とする金属磁性粒子、粒子形状:針状、平均一次長軸径:0.063μm、平均一次短軸径:0.0116μm、軸比:5.4、保磁力値:187.0kA/m(2,350Oe)、飽和磁化値:131.8Am2/kg(131.8emu/g))12g、研磨剤(商品名:AKP−50、住友化学株式会社製)1.2g、カーボンブラック1 0.12g、結合剤樹脂溶液(スルホン酸カリウム基を有する塩化ビニル系共重合樹脂30重量%とシクロヘキサノン70重量%)及びシクロヘキサノンとを混合し、自動乳鉢を用いて30分間混練して混練物を得た。
鉄を主成分とする金属磁性粒子粉末 100.0重量部、
スルホン酸カリウム基を有する塩化ビニル系共重合樹脂 10.0重量部、
スルホン酸ナトリウム基を有するポリウレタン樹脂 10.0重量部、
研磨剤(AKP−50) 10.0重量部、
カーボンブラック1 1.0重量部、
潤滑剤(ミリスチン酸:ステアリン酸ブチル=1:2) 3.0重量部、
硬化剤(ポリイソシアネート) 5.0重量部、
シクロヘキサノン 65.8重量部、
メチルエチルケトン 164.5重量部、
トルエン 98.7重量部。
カーボンブラック1 12.0g、カーボンブラック2(平均一次粒子径:0.37μm)1.8g、酸化鉄1.8g、結合剤樹脂溶液(ニトロセルロース30重量%とシクロヘキサノン70重量%)及びシクロヘキサノンとを混合し、自動乳鉢を用いて30分間混練して混練物を得た。なお、カーボンブラック2は平均一次粒子径が0.37μmのカーボンブラックをカーボンブラック1と同じ洗浄条件にて高純度化を行うことによって得た。得られたカーボンブラック2は可溶性ナトリウム塩の含有量がNa換算で18ppm、可溶性硫酸塩の含有量がSO4換算で25ppmであった。
カーボンブラック1(平均一次粒子径 0.025μm) 100.0重量部、
カーボンブラック2(平均一次粒子径 0.37μm) 15.0重量部、
酸化鉄 15.0重量部、
ニトロセルロース樹脂 55.0重量部、
スルホン酸ナトリウム基を有するポリウレタン樹脂 35.0重量部、
硬化剤(ポリイソシアネート) 18.0重量部、
シクロヘキサノン 325.0重量部、
メチルエチルケトン 655.0重量部、
トルエン 325.0重量部。
ヘマタイト粒子を製造するための前駆体であるゲータイト粒子として前駆体2〜4を準備した。該ゲータイト粒子の諸特性を表1に示す。
前駆体であるゲータイト粒子の種類、焼結防止剤の種類及び被覆量、真空凍結乾燥処理の固形分濃度、凍結温度、真空度及び乾燥温度を種々変化させた以外は、粒子1と同様にしてゲータイト粒子を得た。
焼結防止処理を行って得られたゲータイト粒子粉末を含む含水物に対し、予備凍結を行わずに、真空度を50Paにまであげて、ゲータイト粒子粉末を含む含水物を自己凍結させた。そのときの凍結温度は−40℃であった。次いで、−40℃の状態から徐々に温度をあげて50℃にし、水分が3%以下になるまで乾燥を行った以外は、粒子1と同様にしてゲータイト粒子を得た。
焼結防止処理後の乾燥を真空凍結乾燥で行わずに、通常の乾燥機により行った以外は、粒子1と同様にしてゲータイト粒子を得た。
ゲータイト粒子の種類、低密度加熱処理の温度と時間、高密度加熱処理の温度と時間を種々変化させた以外は、実施例1−1と同様にして非磁性下地層用非磁性粒子粉末を得た。
ヘマタイト粒子の種類、表面処理添加物の種類及び量を種々変化させた以外は、実施例2−1と同様にして非磁性下地層用非磁性粒子粉末を得た。
ヘマタイト粒子の種類、真空凍結乾燥処理の固形分濃度、凍結温度、真空度、及び乾燥温度を種々変化させた以外は、実施例3−1と同様にして非磁性下地層用非磁性粒子粉末を得た。
非磁性下地層2〜9、比較非磁性下地層1〜4:
非磁性下地層用非磁性粒子粉末の種類を種々変化させた以外は、非磁性下地層1と同様にして非磁性下地層を得た。
実施例4−2〜4−9及び比較例2−1〜2−4:
非磁性下地層の種類及び磁性粒子の種類を種々変化させた以外は、前記実施例4−1と同様にして磁気記録媒体を製造した。
Claims (4)
- ゲータイト粒子を含む固形分濃度50重量%以下の含液物を真空凍結乾燥した後に、該乾燥物を熱処理してヘマタイト粒子粉末にすることを特徴とする磁気記録媒体の非磁性下地層用非磁性粒子粉末の製造方法。
- ゲータイト粒子を含む固形分濃度50重量%以下の含液物を真空凍結乾燥し、該乾燥物を熱処理してヘマタイト粒子粉末にした後、該ヘマタイト粒子粉末を水に分散して得られる水懸濁液に、アルミニウム化合物及び/又はケイ素化合物を添加して、前記ヘマタイト粒子の粒子表面を、アルミニウムの水酸化物、アルミニウムの酸化物、ケイ素の水酸化物及びケイ素の酸化物から選ばれる一種又は二種以上の表面被覆物によって被覆し、次いで、濾別、水洗、乾燥、粉砕することによりヘマタイト粒子粉末を得ることを特徴とする磁気記録媒体の非磁性下地層用非磁性粒子粉末の製造方法。
- ゲータイト粒子を含む固形分濃度50重量%以下の含液物を真空凍結乾燥し、該乾燥物を熱処理してヘマタイト粒子粉末にした後、該ヘマタイト粒子粉末を水に分散して得られる水懸濁液に、アルミニウム化合物及び/又はケイ素化合物を添加して、該ヘマタイト粒子粉末の粒子表面を、アルミニウムの水酸化物、アルミニウムの酸化物、ケイ素の水酸化物及びケイ素の酸化物から選ばれる一種又は二種以上の表面被覆物によって被覆し、次いで、該表面被覆したヘマタイト粒子を含む固形分濃度50重量%以下の含液物を真空凍結乾燥することを特徴とする磁気記録媒体の非磁性下地層用非磁性粒子粉末の製造方法。
- 非磁性支持体、該非磁性支持体上に形成される非磁性粒子粉末と結合剤樹脂とを含む非磁性下地層及び該非磁性下地層の上に形成される磁性粒子粉末と結合剤樹脂とを含む磁気記録層からなる磁気記録媒体において、前記非磁性粒子粉末が請求項1乃至請求項3のいずれかに記載された非磁性下地層用非磁性粒子粉末の製造方法によって得られた磁気記録媒体の非磁性下地層用非磁性粒子粉末であることを特徴とする磁気記録媒体。
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CN111902869A (zh) * | 2018-03-30 | 2020-11-06 | 索尼公司 | 磁性粉末的制造方法和磁记录介质的制造方法 |
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JP2020109716A (ja) * | 2018-03-30 | 2020-07-16 | ソニー株式会社 | 磁気記録媒体 |
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JP2020144972A (ja) * | 2018-03-30 | 2020-09-10 | ソニー株式会社 | 磁気記録媒体 |
CN111902869A (zh) * | 2018-03-30 | 2020-11-06 | 索尼公司 | 磁性粉末的制造方法和磁记录介质的制造方法 |
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JP7283446B2 (ja) | 2018-03-30 | 2023-05-30 | ソニーグループ株式会社 | 磁気記録媒体 |
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