JPH0525365B2 - - Google Patents
Info
- Publication number
- JPH0525365B2 JPH0525365B2 JP61098800A JP9880086A JPH0525365B2 JP H0525365 B2 JPH0525365 B2 JP H0525365B2 JP 61098800 A JP61098800 A JP 61098800A JP 9880086 A JP9880086 A JP 9880086A JP H0525365 B2 JPH0525365 B2 JP H0525365B2
- Authority
- JP
- Japan
- Prior art keywords
- nylon
- weight
- magnetic powder
- magnetic
- lubricant
- 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 - Fee Related
Links
- 239000004677 Nylon Substances 0.000 claims description 19
- 229920001778 nylon Polymers 0.000 claims description 19
- 239000002131 composite material Substances 0.000 claims description 8
- 239000000314 lubricant Substances 0.000 claims description 7
- 239000000843 powder Substances 0.000 claims description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical group [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 4
- 239000000696 magnetic material Substances 0.000 claims description 4
- 150000002902 organometallic compounds Chemical class 0.000 claims description 4
- 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
- 229910052719 titanium Inorganic materials 0.000 claims 1
- 239000006247 magnetic powder Substances 0.000 description 18
- 230000000694 effects Effects 0.000 description 6
- 238000004898 kneading Methods 0.000 description 5
- -1 fatty acid salt Chemical class 0.000 description 4
- 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
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000012756 surface treatment agent Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000001746 injection moulding Methods 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
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 150000002910 rare earth metals Chemical class 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910000859 α-Fe Inorganic materials 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
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000005347 demagnetization Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 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
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Hard Magnetic Materials (AREA)
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
磁性材料に関するものである。
〔従来の技術〕
熱可塑性樹脂と磁性粉末を混合、混練した後に
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の製品が後加工なしに
得られること、寸法精度の良好なこと、焼結磁石
の欠点である脆弱さのないこと、焼結磁石では不
可能なリング状でラジアル配向の製品が容易に得
られること、また量産性に優れること等の特長に
より近年種々の用途に用いられてきている。
かかる複合磁石の磁気特性は結合材である樹脂
で薄められる分だけ低下するのは不可避であり、
いかにして磁性粉末の充填率を高くするかが磁気
特性を向上する要因である。
〔発明が解決しようとする問題点〕
しかし、磁性粉末を多量に混合、混練した場合
複合体全体の溶融粘度が著しく上昇して成形が困
難となつたり、磁性粉末の配向が不十分となつた
りすることや、成形体の機械的強度が低下するこ
と等の問題により磁性粉末の充填率は85重量％程
度に制約されているのが現状である。
〔問題点を解決するための手段〕
本発明者らはこの問題点を解決すべく鋭意研究
を重ねた結果、ナイロンと磁性粉末を混合する前
に磁性粉末を一分子内に２個以上のチタン原子を
含み、ステアロイル基を有する有機金属化合物に
より表面処理し、好ましくは高級脂肪酸塩、ワツ
クス等の滑剤をナイロン混合の際に添加して混
合、混練することにより成形性を損なわずに磁性
粉末を高充填化する方法を見出し本発明を完成す
るに至つた。
即ち本発明はナイロン３〜20重量％、磁性粉末
79.8〜95重量％、一分子内に２個以上のチタン原
子を含み、ステアロイル基を有する有機金属化合
物0.1〜２重量％、滑剤0.1〜５重量％を混合、混
練してなることを特徴とする成形加工性及び磁気
特性に優れた複合磁性材料を提供するものであ
る。
〔作用〕
本発明の磁性材料の特徴はナイロンと磁性粉末
を混合する工程の前に磁性粉末を一分子内に２個
以上のチタンを含み、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と磁性粉末の表面と
溶融状態でのナイロンとの間の摩擦抵抗が減少し
複合体全体としての溶融粘度が低下するので、多
量に磁性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作用によつて成形
性、配向度が一層改善され、ひいては金型の摩耗
の低減にも効果を及ぼすこととなる。
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、６，１−
ナイロン、11−ナイロン、12−ナイロン等が挙げ
られる。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、耐衝撃性を要求される場合は12−ナイロンが
好ましい。ナイロンの形状としてはパウダー、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、磁性粉末としては、Srフエライト、Ba
フエライト、希土類コバルト、アルニコ等の磁石
粉末が使用される。
有機化合物としては一般式
ｎ＝２〜10の整数 ａ＋ｂ＝2n＋１の整数
Ｒ：ｉ−C3H7，R′：C17H35
で示されるものである。
この化合物の添加量の適正値は磁性粉末の比表
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。
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のような可塑剤等がいずれ
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％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。
〔実施例〕
以下に実施例、比較例を挙げて説明する。
実施例、比較例
表−１に示した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、希土類粉末は真空
引をしながら乾燥した。）
(2) 表面処理剤の磁性粉末とナイロン、滑剤の混
合はスーパーミキサーで５〜10min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℃
上記の方法により得られた材料の評価は下記に
より行つた。
(1) 成形性
下記条件によりタナベコウギヨウ(株)の磁場射出
成形機TL50−MGSを使用してφ30×φ10×６の
形状のものを成形して外観を観察した。
[Industrial Application Field] The present invention relates to a composite magnetic material with excellent moldability and magnetic properties. [Prior art] So-called plastic magnets, which are obtained by injection molding after mixing and kneading thermoplastic resin and magnetic powder, have the advantage of being able to obtain products with complex shapes without post-processing and having good dimensional accuracy. In recent years, sintered magnets have been used for a variety of purposes due to their advantages such as lack of brittleness, which is a drawback of sintered magnets, the ability to easily obtain ring-shaped and radially oriented products that are impossible with sintered magnets, and excellent mass production. It is being used. It is inevitable that the magnetic properties of such a composite magnet will deteriorate as it is diluted with the resin that is the binding material.
The key to improving magnetic properties is how to increase the filling rate of magnetic powder. [Problems to be solved by the invention] However, when a large amount of magnetic powder is mixed and kneaded, the melt viscosity of the entire composite increases significantly, making molding difficult, and the orientation of the magnetic powder becomes insufficient. At present, the filling rate of magnetic powder is limited to about 85% by weight due to problems such as the need for molded products and a decrease in the mechanical strength of the molded body. [Means for solving the problem] As a result of extensive research in order to solve this problem, the present inventors have found that, before mixing nylon and magnetic powder, the magnetic powder is mixed with two or more titanium atoms in one molecule. The surface is treated with an organometallic compound that contains atoms and has a stearoyl group, and preferably a lubricant such as a higher fatty acid salt or wax is added during mixing and kneading to form a magnetic powder without impairing moldability. The present invention was completed by discovering a method for increasing the filling rate. That is, the present invention uses 3 to 20% by weight of nylon and magnetic powder.
79.8 to 95% by weight, 0.1 to 2% by weight of an organometallic compound containing two or more titanium atoms in one molecule and having a stearoyl group, and 0.1 to 5% by weight of a lubricant. The present invention provides a composite magnetic material with excellent moldability and magnetic properties. [Function] The feature of the magnetic material of the present invention is that, before the step of mixing nylon and magnetic powder, when the magnetic powder contains two or more titanium atoms in one molecule and is surface-treated with an organometallic compound having a stearoyl group, the magnetic powder becomes magnetic. The frictional resistance between the surface of the nylon and the nylon in the molten state is reduced, and the melt viscosity of the composite as a whole is lowered, so even if a large amount of magnetic powder is mixed in, not only does moldability not deteriorate, but it also The degree of orientation of the magnetic powder is also significantly improved. Further, by adding a lubricant such as a higher fatty acid salt or a wax, the moldability and degree of orientation are further improved due to a synergistic effect with the surface treatment agent, and this also has the effect of reducing mold wear. Examples of the nylon resin used in the present invention include 6-nylon, 6,6-nylon, 6,1-
Examples include nylon, 11-nylon, 12-nylon, and the like. When relatively heat resistance is required, 6-nylon and 6,6-nylon are preferred, and when dimensional accuracy and impact resistance are required, 12-nylon is preferred. Although nylon can be used in either powder or pellet form, powder is preferred in view of workability in mixing and kneading. In addition, magnetic powders include Sr ferrite, Ba
Magnet powders such as ferrite, rare earth cobalt, and alnico are used. General formula for organic compounds n=an integer of 2 to 10, a+b=an integer of 2n+1, R: i-C 3 H 7 , R': C 17 H 35 . The appropriate amount of this compound added varies depending on the specific surface area and surface activity of the magnetic powder, but is usually 0.1
The amount is preferably about 1% by weight, since even if it exceeds 2%, the effect will not increase and it will be disadvantageous in terms of cost. As the lubricant, polyethylene wax, higher fatty acids and their salts, plasticizers such as DOP, etc. can all be used, but stearate is preferred, and zinc stearate is particularly preferred. these are
It is added in an amount of 0.1 to 5% by weight, but if it is less than 0.1%, no effect is observed, and if it exceeds 5% by weight, mechanical strength decreases, which is not preferable. [Example] Examples and comparative examples will be described below. Examples and Comparative Examples The compositions shown in Table 1 were mixed and kneaded under the following conditions to obtain pellets, but it goes without saying 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, the rare earth powder was dried under vacuum.) (2) The magnetic powder of the surface treatment agent, nylon, and lubricant were mixed in a super mixer for 5 to 10 minutes. (3) A twin-screw kneading extruder was used for kneading. Temperature 12-Nylon...220°C 6-Nylon...240°C The materials obtained by the above method were evaluated as follows. (1) Moldability A product having a shape of φ30×φ10×6 was molded using a magnetic field injection molding machine TL50-MGS manufactured by Tanabe Kogiyo Co., Ltd. under the following conditions, and its appearance was observed.
【表】
(2) 流動性
第１図に示す溝形状を有するスパイラルフロー
金型を用い、下記条件によりテストした。[Table] (2) Fluidity Tests were conducted under the following conditions using a spiral flow mold having the groove shape shown in Figure 1.
【表】
(3) 曲げ強度 ASTM D790−70
(4) 磁気特性 減磁特性を測定した。
これらの評価結果を表−２に示したが、本発明
によつて、非常に効果的な表面処理法とその効果
を相乗的に飛躍させる滑剤が見い出されその組合
せの効果を発見したことにより、配向性を改善し
た高磁気特性品を得るとともに材料の流動性を著
しく向上せしめ成形性を大幅に改善することがで
きた。今後複合磁石がOA機器を中心にますます
需要が拡大されると同時に小型化、薄型化、軽量
化されつつある傾向から本発明の工業的価値は極
めて大きいものと信ずる。[Table] (3) Bending strength ASTM D790-70 (4) Magnetic properties Demagnetization properties were measured. The results of these evaluations are shown in Table 2. According to the present invention, a highly effective surface treatment method and a lubricant that synergistically enhances the effect have been discovered, and the effect of their combination has been discovered. We were able to obtain a product with high magnetic properties with improved orientation, significantly improve the fluidity of the material, and significantly improve moldability. We believe that the industrial value of the present invention will be extremely great because the demand for composite magnets will continue to expand in the future, mainly in office automation equipment, and at the same time, there will be a trend towards smaller, thinner, and lighter composite magnets.
【表】【table】
【表】【table】
第１図は流動性の試験に用いた溝形状を有する
スパイラルフロー金型の形状を示す。
単位はmm。
FIG. 1 shows the shape of a spiral flow mold with grooves used in the fluidity test. The unit is mm.
Claims (1)
量％、滑剤0.1〜５重量％、及び、一分子内に２
個以上のチタン原子を含みステアロイル基を有す
る有機金属化合物0.1〜２重量％からなることを
特徴とする複合磁性材料。1 3-20% by weight of nylon, 79.8-95% by weight of magnet powder, 0.1-5% by weight of lubricant, and 2% by weight in one molecule.
1. A composite magnetic material comprising 0.1 to 2% by weight of an organometallic compound containing at least one titanium atom and having a stearoyl group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61098800A JPS62259404A (en) | 1986-04-28 | 1986-04-28 | Composite magnetic material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61098800A JPS62259404A (en) | 1986-04-28 | 1986-04-28 | Composite magnetic material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62259404A JPS62259404A (en) | 1987-11-11 |
| JPH0525365B2 true JPH0525365B2 (en) | 1993-04-12 |
Family
ID=14229422
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61098800A Granted JPS62259404A (en) | 1986-04-28 | 1986-04-28 | Composite magnetic material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62259404A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5688304A (en) * | 1979-12-20 | 1981-07-17 | Sumitomo Bakelite Co Ltd | Magnet composition of plastics |
-
1986
- 1986-04-28 JP JP61098800A patent/JPS62259404A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5688304A (en) * | 1979-12-20 | 1981-07-17 | Sumitomo Bakelite Co Ltd | Magnet composition of plastics |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62259404A (en) | 1987-11-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |