JPH0467761B2 - - Google Patents
Info
- Publication number
- JPH0467761B2 JPH0467761B2 JP61012063A JP1206386A JPH0467761B2 JP H0467761 B2 JPH0467761 B2 JP H0467761B2 JP 61012063 A JP61012063 A JP 61012063A JP 1206386 A JP1206386 A JP 1206386A JP H0467761 B2 JPH0467761 B2 JP H0467761B2
- Authority
- JP
- Japan
- Prior art keywords
- nylon
- magnet
- weight
- powder
- composite
- 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.)
- Expired - Lifetime
Links
- 239000004677 Nylon Substances 0.000 claims description 18
- 229920001778 nylon Polymers 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 17
- 239000000843 powder Substances 0.000 claims description 16
- 239000002131 composite material Substances 0.000 claims description 13
- 239000000314 lubricant Substances 0.000 claims description 8
- 150000002902 organometallic compounds Chemical class 0.000 claims description 6
- 125000003696 stearoyl group Chemical group O=C([*])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 claims description 4
- 229910000859 α-Fe Inorganic materials 0.000 claims description 3
- 125000003545 alkoxy group Chemical group 0.000 claims description 2
- 229910017052 cobalt Inorganic materials 0.000 claims description 2
- 239000010941 cobalt Substances 0.000 claims description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 2
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 2
- 150000002910 rare earth metals Chemical group 0.000 claims description 2
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical group [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 claims description 2
- 239000006247 magnetic powder Substances 0.000 description 9
- 238000000465 moulding Methods 0.000 description 8
- 238000004898 kneading Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- -1 fatty acid salt Chemical class 0.000 description 5
- 239000004033 plastic Substances 0.000 description 5
- 229920003023 plastic Polymers 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 235000014113 dietary fatty acids Nutrition 0.000 description 3
- 229930195729 fatty acid Natural products 0.000 description 3
- 239000000194 fatty acid Substances 0.000 description 3
- 238000004381 surface treatment Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 238000010561 standard procedure Methods 0.000 description 2
- 239000012756 surface treatment agent Substances 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 229910000828 alnico Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
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
- H01F1/06—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
Description
（産業上の利用分野）
本発明は成形加工性及び磁気特性に優れた複合
磁石の材料に関する。
（従来の技術）
熱可塑性樹脂と磁性粉末を混合、混練し、射出
成形することによつて得られるいわゆるプラスチ
ツク磁石は、複雑な形状が後加工なしで得られる
こと、量産性に優れること、寸法精度の良好なこ
と、焼結磁石の欠点であるもろさがないことなど
の特長のため近年種々の用途に用いられてきてい
る。また、プラスチツク磁石の材料として用いら
れる樹脂としては、成形時の成形特性などを考慮
して溶融粘度の比較的低いものが使用されてきて
いる。
（発明が解決しようとする問題点）
従来のプラスチツク磁石では磁石粉末を結合材
料としてのプラスチツクに多量に混合、混練する
と得られる複合体の溶融粘度が著しく上昇して成
形が困難となるため、磁石粉末の充填率は85％
（重量）程度に制約される。又溶融粘度の上昇は
磁石粉末の配向を阻害するため磁気特性は焼結磁
石に比較して劣るものにならざるを得なかつた。
そこで本発明は、上記のような、プラスチツク
磁石形成用に従来使用されてきた材料における、
成形時の素材の流動性の低さ並びに磁性粉末の充
填率の低さ、ひいては成形後の磁気特性の低さを
改良することを目的とするものである。
（問題点を解決するための手段）
本発明においては、基本材料としてのナイロン
と磁性粉末とからなる複合磁石用材料のうちの磁
性材料を、混合及び混練する前に、その磁性粉末
をステアロイル基を有する有機金属化合物で表面
処理することを内容とするものである。更に磁石
の成形に際して高級脂肪酸塩やワツクス等の滑剤
を添加する。
即ち更に詳しくは、ナイロンを３〜20重量％、
ステアロイル基を有する有機金属化合物0.1〜２
重量％で予め表面処理をした磁性粉末を79.8〜95
重量％及び滑剤を0.2〜５重量％混合並びに混練
してなる複合磁石用材料を提供するものである。
本発明で用いられるナイロン樹脂としてはたと
えば６−ナイロン、６，６−ナイロン、６，10−
ナイロン、11−ナイロン、12−ナイロン等に挙げ
られるが、比較的耐熱性を要求される場合は６−
ナイロン、６，６−ナイロンが好ましく、寸法精
度、耐衝撃性等が要求される場合は12−ナイロン
が好ましい。形状はパウダー、ペレツトのいずれ
でも使用可能であるが混合混練の作業性を考慮す
るとパウダーが好ましい。
また磁石粉末はいずれの種類でも使用可能であ
り、Srフエライト、Baフエライト、希土類コバ
ルト、アルニコ等の永久磁石粉末が使用される。
有機金属化合物としては一般式（RO）4-o・
Ti・Sto（ROはアルコキシ基、Stはステアロイル
基、ｎは１〜３の整数）で示される化合物が挙げ
られるが、好ましくはトリステアロイルｉ−プロ
ポキシチタンである。この添加量の適正量は磁性
粉末の比表面積、表面活性度によつて変わるが、
通常は0.1〜２重量％であり、２重量％を越えて
も効果は増加せず、コスト的に不利となるので、
最も好ましくは１重量％前後である。
また滑剤としてはポリエチレンワツクス、高級
脂肪酸及びその塩、DOPのような可塑剤がいず
れも使用できるが、好ましくはステアリン酸塩、
特に好ましくはステアリン酸亜鉛である。これら
は0.1〜５重量％の範囲で添加されるが、0.1重量
％以下では効果が認められず、５重量％を越える
場合は機械的強度が低下するので好ましくない。
（作用）
本発明の特徴である磁石粉末の表面処理を行う
と、樹脂、例えばナイロンと磁石粉末とが溶融状
態になつたときに、磁石粉末の表面と素材として
のナイロンとの間の摩擦抵抗が低下し、複合体全
体としての溶融粘度も低下するので多量に磁石粉
末を混合しても成形加工性が損なわれないばかり
でなく、磁場中での磁性粉末の配向度も著しく改
善されることにある。更に高級脂肪酸塩ワツクス
等の滑剤を加えることにより、表面処理剤との相
乗効果によつて成形性、配向度が一層改善される
と共に、成形加工時の離型性も改善されひいては
金型の摩耗の減少にも効果を及ぼすこととなる。
（実施例）
以下に本発明の実施例を比較例と対比しつつ説
明する。
(Industrial Application Field) The present invention relates to a material for a composite magnet having excellent moldability and magnetic properties. (Prior art) So-called plastic magnets, which are obtained by mixing and kneading thermoplastic resin and magnetic powder and injection molding, have the following advantages: complex shapes can be obtained without post-processing, excellent mass production, and size. In recent years, magnets have been used for a variety of purposes due to their high precision and lack of brittleness, which is a disadvantage of sintered magnets. Furthermore, as resins used as materials for plastic magnets, resins with relatively low melt viscosity have been used in consideration of molding characteristics during molding. (Problems to be Solved by the Invention) In conventional plastic magnets, when a large amount of magnet powder is mixed with plastic as a binding material and kneaded, the melt viscosity of the resulting composite increases significantly, making molding difficult. Powder filling rate is 85%
(weight). Furthermore, since the increase in melt viscosity inhibits the orientation of the magnet powder, the magnetic properties are inevitably inferior to those of sintered magnets. Therefore, the present invention aims to provide the above-mentioned materials that have been conventionally used for forming plastic magnets.
The purpose is to improve the low fluidity of the material during molding, the low filling rate of magnetic powder, and the low magnetic properties after molding. (Means for Solving the Problems) In the present invention, before mixing and kneading the magnetic material of the composite magnet material consisting of nylon as a basic material and magnetic powder, the magnetic powder is mixed with a stearoyl group. The purpose of this method is to treat the surface with an organometallic compound having the following properties. Furthermore, when forming the magnet, a lubricant such as a higher fatty acid salt or wax is added. That is, in more detail, 3 to 20% by weight of nylon,
Organometallic compound having stearoyl group 0.1-2
Magnetic powder with pre-surface treatment at 79.8~95% by weight
The object of the present invention is to provide a composite magnet material obtained by mixing and kneading 0.2 to 5% by weight of a lubricant. Examples of the nylon resin used in the present invention include 6-nylon, 6,6-nylon, 6,10-
Examples include nylon, 11-nylon, 12-nylon, etc., but when relatively heat resistance is required, 6-nylon is used.
Nylon and 6,6-nylon are preferred, and 12-nylon is preferred when dimensional accuracy, impact resistance, etc. are required. Although it can be used in either powder or pellet form, powder is preferred in view of the workability of mixing and kneading. Further, any type of magnet powder can be used, and permanent magnet powders such as Sr ferrite, Ba ferrite, rare earth cobalt, and alnico are used. As an organometallic compound, the general formula (RO) 4-o・
Examples include compounds represented by Ti.Sto ( RO is an alkoxy group, St is a stearoyl group, and n is an integer of 1 to 3), and tristearoyl i-propoxytitanium is preferred. The appropriate amount of this addition varies depending on the specific surface area and surface activity of the magnetic powder, but
Usually it is 0.1 to 2% by weight, and even if it exceeds 2% by weight, the effect will not increase and it will be disadvantageous in terms of cost.
Most preferably it is around 1% by weight. As a lubricant, any of polyethylene wax, higher fatty acids and their salts, and plasticizers such as DOP can be used, but preferably stearate,
Particularly preferred is zinc stearate. These are added in an amount of 0.1 to 5% by weight, but if it is less than 0.1% by weight, no effect is observed, and if it exceeds 5% by weight, the mechanical strength decreases, which is not preferable. (Function) When the surface treatment of the magnet powder, which is a feature of the present invention, is performed, when the resin, for example, nylon, and the magnet powder are in a molten state, there is a frictional resistance between the surface of the magnet powder and the nylon material. , and the melt viscosity of the composite as a whole also decreases, so not only is moldability not impaired even when a large amount of magnetic powder is mixed, but the degree of orientation of the magnetic powder in a magnetic field is also significantly improved. It is in. Furthermore, by adding a lubricant such as higher fatty acid salt wax, the moldability and degree of orientation are further improved due to the synergistic effect with the surface treatment agent, and the mold releasability during molding is also improved, which ultimately reduces mold wear. This will also have an effect on the reduction of (Example) Examples of the present invention will be described below in comparison with comparative examples.
【表】【table】
【表】
表−１の組成を以下の条件で混合、混練し、ペ
レツトを得たが以下の条件に限定されないことは
勿論である。
(1) 表面処理剤はスーパーミキサーで20％ｎ−ヘ
キサン溶液として磁性粉末と混合し、120℃×
1Hr乾燥を行つた。（但し希土類は真空引をし
ながら乾燥したる。）
(2) 磁石粉末とナイロン、滑剤の混合はスーパー
ミキサーで10min行つた。
(3) 混練は二軸混練押出機を使用した。
温度 12−ナイロン−220℃、６−ナイロン240
℃
表−１の材料の評価は下記により行つた。
(1) 成形性
温度 12−ナイロン−270℃、６−ナイロン90
℃
圧力 70Kg／cm2
成形磁場 120000e
上記の条件でφ30×φ10×６の成形品について
外観を観察した。
(2) 流動性
下辺の直径が２mm上辺の直径が３mm高さ2.5mm
のスパイラルフロー金型を用いテストした。
（温度280℃ 圧力70Kg／cm2）
(3) 曲げ強度 定法による
(4) 磁気特性 定法による[Table] The composition shown in Table 1 was mixed and kneaded under the following conditions to obtain pellets, but it is needless to say that the conditions are not limited to the following. (1) The surface treatment agent is mixed with magnetic powder as a 20% n-hexane solution in a super mixer, and heated at 120℃
Drying was performed for 1 hour. (However, rare earths were dried under vacuum.) (2) The magnet powder, nylon, and lubricant were mixed for 10 minutes using a super mixer. (3) A twin-screw kneading extruder was used for kneading. Temperature 12-nylon-220℃, 6-nylon 240
℃ The materials shown in Table 1 were evaluated as follows. (1) Formability Temperature 12-nylon-270℃, 6-nylon 90
°C Pressure 70Kg/cm 2 Molding magnetic field 120000 eThe external appearance of a φ30×φ10×6 molded product was observed under the above conditions. (2) Fluidity Bottom diameter: 2mm, top diameter: 3mm, height: 2.5mm
The test was conducted using a spiral flow mold. (Temperature 280℃ Pressure 70Kg/cm 2 ) (3) Bending strength According to the standard method (4) Magnetic properties According to the standard method
【表】
（発明の効果）
以下の如く本発明による複合磁石用材料は、複
合磁石にある磁石材料の成形時における樹脂との
摩擦抵抗を低下せしめる表面処理を予め施してな
るので、成形時の複合体の流動性が飛躍的に向上
し、結果的には磁石材料の充填率が向上する。ま
た併用する滑剤の作用は前記の摩擦抵抗の低下に
対し相乗効果をもたらし、溶融状態での流動性が
著るしく向上されるとともに、成形性も改良され
る磁石の成形時には磁石粉末の配向性が改善され
かつ磁気特性にも改良された磁石を形成すること
ができる。[Table] (Effects of the Invention) As shown below, the composite magnet material according to the present invention has been subjected to surface treatment to reduce the frictional resistance between the magnet material in the composite magnet and the resin during molding. The fluidity of the composite is dramatically improved, and as a result, the filling rate of the magnetic material is improved. In addition, the action of the lubricant used in combination has a synergistic effect on the above-mentioned reduction in frictional resistance, and the fluidity in the molten state is significantly improved, as well as the formability. It is possible to form a magnet with improved magnetic properties.
Claims (1)
％、滑剤0.1〜５重量％、及び有機金属化合物0.1
〜2.0重量％からなり、 前記有機金属化合物は、 一般式（RO）4-o・Ti・Sto（但し、ROはアルコ
キシ基、Stはステアロイル基、ｎは１〜３の整
数）で示されることを特徴とする複合磁石用材
料。 ２ 前記磁石粉末がフエライト磁石粉末であるこ
とを特徴とする特許請求の範囲第１項記載の複合
磁石用材料。 ３ 前記磁石粉末が希土類コバルト磁石粉末であ
ることを特徴とする特許請求の範囲第１項記載の
複合磁石用材料。 ４ 前記有機金属化合物が0.5〜2.O重量％である
ことを特徴とする特許請求の範囲第１項記載の複
合磁石用材料。 ５ 前記滑剤がステアリン酸亜鉛であることを特
徴とする特許請求の範囲第１項記載の複合磁石用
材料。[Claims] 1. Magnet powder 79.8-95%, nylon 3-20% by weight, lubricant 0.1-5% by weight, and organometallic compound 0.1%.
~2.0% by weight, and the organometallic compound is represented by the general formula (RO) 4-o・Ti・St o (where RO is an alkoxy group, St is a stearoyl group, and n is an integer from 1 to 3). A composite magnet material characterized by: 2. The composite magnet material according to claim 1, wherein the magnet powder is ferrite magnet powder. 3. The composite magnet material according to claim 1, wherein the magnet powder is rare earth cobalt magnet powder. 4. The composite magnet material according to claim 1, wherein the organometallic compound is 0.5 to 2.0% by weight. 5. The composite magnet material according to claim 1, wherein the lubricant is zinc stearate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61012063A JPS62171101A (en) | 1986-01-24 | 1986-01-24 | Composite magnet material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61012063A JPS62171101A (en) | 1986-01-24 | 1986-01-24 | Composite magnet material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62171101A JPS62171101A (en) | 1987-07-28 |
| JPH0467761B2 true JPH0467761B2 (en) | 1992-10-29 |
Family
ID=11795141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61012063A Granted JPS62171101A (en) | 1986-01-24 | 1986-01-24 | Composite magnet material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62171101A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2767244B2 (en) * | 1987-10-17 | 1998-06-18 | 株式会社 トーキン | Method for producing composite magnet composition |
-
1986
- 1986-01-24 JP JP61012063A patent/JPS62171101A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62171101A (en) | 1987-07-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |