JP5214830B2 - 磁気抵抗性CrO2−ポリマー複合材配合物 - Google Patents
磁気抵抗性CrO2−ポリマー複合材配合物 Download PDFInfo
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- 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
- H01F1/40—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials of magnetic semiconductor materials, e.g. CdCr2S4
- H01F1/408—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials of magnetic semiconductor materials, e.g. CdCr2S4 half-metallic, i.e. having only one electronic spin direction at the Fermi level, e.g. CrO2, Heusler alloys
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- 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
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Description
本発明は、ポリマー(好ましくは低密度ポリエチレン(LDPE))、強磁性充填剤(好ましくは磁気特性を発揮し得る酸化クロム)および添加剤(好ましくは複合材中で磁気抵抗性特性をもたらす電導性カーボン)を含有する磁気抵抗性ポリマー複合材配合物の製造法にも関する。
本発明の一態様は、CrO2バルクの強磁性特性と金属電導率に類似する特性を有すると共に、外部磁場の存在下での電気的特性によって特徴づけられる電導性ポリマー配合物の製造に関する。
しかしながら、複合材の抵抗を100オームよりも低く維持するためには呼称濃度は3重量%よりも高くするのが常に好ましい。電導性添加剤のネットワークによって磁性CrO2粒子間の浸透は効果的におこなわれる結果、CrO2−ポリマー配合物の応答は外部磁場の印加によって測定することができる。
(i)ポリマー(好ましくは低密度ポリエチレン)88〜93重量%、
(ii)磁性充填剤(好ましくはCrO2)5〜8重量%、おおび
(iii)添加剤2〜4重量%。
ポリマーは、好ましくはメッシュサイズが200μで、純度が99.9%の高密度ポリエチレンである。磁性充填剤は粉末状形態であるのが好ましい。
上記のポリマー複合材配合物の溶融温度は約95℃である。
(a)該ポリマー、該CrO2および該添加剤を混合して均一混合物を調製し、
(b)該均一混合物を95〜100℃で加熱することによって混合溶融物を調製し、次いで
(c)該混合溶融物を2枚の金属プレート間において一軸方向の加圧下で注型することによってシートを得る。
上記のシートを得るために印加する圧力は4〜5.5KPaである。
(a)ポリマー、CrO2および添加剤を混合することによって均一混合物を調製し、
(b)該均一混合物をダイ(印加圧:4.5〜5.5KPa)内へ移してペレットを調製し、
(c)該ペレットを金属製モールド内へ移し、予熱した熱圧プレス機内に該モールドを保持し、
(d)ポリマーを4〜5.5KPaの加圧下で溶融させて薄いシートを調製し、次いで
(e)該モールドを冷却させて磁気特性を有するフィルムを得る。
製造される該フィルムのサイズは、混合物の圧縮粉のサイズに応じて直径が10〜25mmの範囲になるようにする。
図1は磁気抵抗特性を示すCrO2−ポリマー配合物のX線回折図である。
図2は粒子の特徴を示すCrO2−ポリマー配合物のSEM顕微鏡写真であり、粒子に添った黒色領域はカーボンの量が特に多い領域である。
図3は抵抗対温度のプロットを示すグラフである。
図4〜図6は異なる温度におけるCrO2−ポリマー配合物の磁気抵抗特性を示すグラフである。
該配合物の厚さとサイズは使用するダイ、原料の使用量および使用するペレットのサイズに応じて変化させることができる。
添加剤としてのカーボンブラック4%、CrO2 16%および低密度ポリエチレン80%からなる組成物を瑪瑙製の乳鉢と乳棒を用いて混合し、均質混合粉末をダイ(直径:5mm)を用いて圧縮してペレット化した。該混合粉末は約3トンの圧力を印加することによって厚さ約4mmのペレットにした。得られたペレットを95℃に予熱したダイ内へ入れ、該ダイを閉鎖した後、油圧プレス内へ移し、約5トンの一軸方向圧を印加した。ポリマー複合材を印加圧条件下で溶融させて配合物を得た。該配合物は厚さが約1mmの円板であって、種々の組成を有するCrO2配合物を調製するための基材である。この配合物の厚さと形態は、使用するダイの形態に従って変化させることができる。
添加剤としてのカーボンブラック5%、CrO2 14%および低密度ポリエチレン81%からなる組成物を瑪瑙製の乳鉢と乳棒を用いて混合し、均質混合粉末をダイ(直径:5mm)を用いて圧縮してペレット化した。該混合粉末は約3トンの圧力を印加することによって厚さ約4mmのペレットにした。得られたペレットを95℃に予熱したダイ内へ入れ、該ダイを閉鎖した後、油圧プレス内へ移し、約5トンの一軸方向圧を印加した。ポリマー複合材を印加圧条件下で溶融させて配合物を得た。該配合物は厚さが約1mmの円板であって、種々の組成を有するCrO2配合物を調製するための基材である。この配合物の厚さと形態は、使用するダイの形態に従って変化させることができる。
Claims (1)
- 磁気抵抗性CrO2−ポリマー複合材配合物であって、下記の成分(i)
〜(iii)を含有する該CrO2−ポリマー複合材配合物:
(i)低密度ポリエチレンポリマー80〜90重量%、
(ii)磁性充填剤CrO27〜16重量%、および
(iii)導電性カーボン添加剤3〜8重量%。
Applications Claiming Priority (2)
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IN934DE2000 | 2000-10-13 | ||
IN934/DEL/00 | 2000-10-13 |
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JP2002121336A JP2002121336A (ja) | 2002-04-23 |
JP5214830B2 true JP5214830B2 (ja) | 2013-06-19 |
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JP2001150708A Expired - Fee Related JP5214830B2 (ja) | 2000-10-13 | 2001-05-21 | 磁気抵抗性CrO2−ポリマー複合材配合物 |
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US (1) | US6793841B2 (ja) |
JP (1) | JP5214830B2 (ja) |
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US7799276B2 (en) | 2003-10-27 | 2010-09-21 | Michigan Molecular Institute | Functionalized particles for composite sensors |
CN106694185B (zh) * | 2016-12-26 | 2018-12-07 | 绍兴尚妮家纺有限公司 | 一种用于内科护理的中药捣药器 |
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US3558492A (en) * | 1969-06-11 | 1971-01-26 | Du Pont | Ferromagnetic chromium oxide recording members and compositions stabilized with tertiary amine-containing polymers |
JPS50139852A (ja) * | 1974-04-26 | 1975-11-08 | ||
JPS5869252A (ja) * | 1981-10-21 | 1983-04-25 | Kureha Chem Ind Co Ltd | 誘電体フイルムおよびその製造方法 |
DE4101869A1 (de) * | 1991-01-23 | 1992-07-30 | Basf Ag | Kunststoffmischung mit ferromagnetischen oder ferroelektrischen fuellstoffen |
DE4229246A1 (de) * | 1992-09-02 | 1994-03-03 | Basf Magnetics Gmbh | Magnetischer Aufzeichnungsträger |
JP2683518B2 (ja) * | 1995-12-25 | 1997-12-03 | 松下電器産業株式会社 | 磁気記録媒体 |
US6627101B2 (en) * | 2000-09-22 | 2003-09-30 | Indian Institute Of Technology | Magneto conductive polymer composite and process for the preparation of the same |
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- 2001-04-09 US US09/829,414 patent/US6793841B2/en not_active Expired - Fee Related
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US6793841B2 (en) | 2004-09-21 |
JP2002121336A (ja) | 2002-04-23 |
US20020065349A1 (en) | 2002-05-30 |
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