JPH0234986B2 - - Google Patents
Info
- Publication number
- JPH0234986B2 JPH0234986B2 JP57204826A JP20482682A JPH0234986B2 JP H0234986 B2 JPH0234986 B2 JP H0234986B2 JP 57204826 A JP57204826 A JP 57204826A JP 20482682 A JP20482682 A JP 20482682A JP H0234986 B2 JPH0234986 B2 JP H0234986B2
- Authority
- JP
- Japan
- Prior art keywords
- polyamide
- molding material
- ferromagnetic powder
- powder
- magnetic properties
- 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
- 239000000843 powder Substances 0.000 claims description 15
- 239000012778 molding material Substances 0.000 claims description 12
- 230000005294 ferromagnetic effect Effects 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 239000004952 Polyamide Substances 0.000 claims description 8
- 229920002647 polyamide Polymers 0.000 claims description 8
- 229920005989 resin Polymers 0.000 claims description 6
- 239000011347 resin Substances 0.000 claims description 6
- 238000004898 kneading Methods 0.000 claims description 4
- 239000011159 matrix material Substances 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 230000005291 magnetic effect Effects 0.000 description 12
- 238000001746 injection moulding Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 229920002292 Nylon 6 Polymers 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 229910052712 strontium Inorganic materials 0.000 description 4
- 229910000859 α-Fe Inorganic materials 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 239000000700 radioactive tracer Substances 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Hard Magnetic Materials (AREA)
Description
本発明は、高磁性特性の成形品が得られる樹脂
磁石成形材料の製造法に関する。
従来、樹脂磁石は、マトリツクスとしてのポリ
アミド系樹脂等の合成樹脂とフエライト（MO・
6Fe2O3、ＭはSrまたはBa）等の強磁性体粉を混
合混練してなる成形材料を磁場をかけて射出成形
することにより得ている。前記成形材料に使用す
るポリアミドは、成形品への悪影響を考慮して乾
燥したものが用いられており、通常吸湿は0.25
％、好ましくは0.01％以下である。成形品の磁気
特性を高めるためには強磁性体粉を多量に充填し
これを高配向させる必要がある。しかし、強磁性
体粉を多量に充填すると成形材料の溶融粘度が高
くなり射出成形ができなかつたり、磁場をかけて
も強磁性体粉が充分配向せず、高磁気特性の成形
品を得ることができなかつた。
本発明は、強磁性体粉を多量に充填しても良好
に成形が行なえ、高磁気特性の成形品が得られる
樹脂磁石成形材料を提供することを目的とするも
のである。
上記目的を達成するために、本発明は、マトリ
ツクスとしてのポリアミドと強磁性体粉末を混合
混練する際、ポリアミドにその重量に対して0.3
％を越える量で吸湿させるか水を添加することを
特徴とするものである。このようにして得たペレ
ツト状或はパウダー状の成形材料は、混合混練の
際合成樹脂が融点以上に加熱されており、水の添
加によつて加水分解を起こし低分子低粘度品とな
る。更に、水は可塑剤としての効果もあり、この
成形材料を射出成形するときには強磁性体粉が多
量に充填されてあつても高粘度にならず良好に成
形が行なわれる。従つて、磁場中での射出成形で
強磁性体粉末が高度に配向して、高磁気特性の樹
脂磁石成形品が得られるわけである。
次に、本発明の実施例を説明する。
実施例 １
溶融粘度1500ポイズ（250℃、100sec-1）の６
ナイロンパウダー11重量部（以下単に部という）、
ストロンチウムフエライト（SrO・6Fe2O3）89
部、水0.1部をスーパーミキサーで混合した。こ
の混合物を６ナイロンの融点以上に保つた二軸押
出機にて混練、混合し、ペレツト状に成形材料を
得た。
この成形材料を用い、磁場射出成形機により磁
気特性測定用試片（20φ×10H）を得た。該試片
の磁気特性をBHトレーサーにより測定し、その
結果を成形材料の溶融粘度、ストロンチウムフエ
ライト配向率と共に第１表に示す。
実施例 ２
常温常湿の雰囲気に24時間以上放置し平衡水分
量（約３％）まで吸湿させた６ナイロンパウダー
を用い、このほかには水を添加せずに実施例１と
同様に行なつた。測定結果を第１表に示す。
実施例 ３
水１部を添加する以外は実施例１と同様に行な
つた。測定結果を第１表に示す。
比較例 １
吸湿量0.3％以下の６ナイロンパウダーを用い、
水を添加せずに他は実施例１と同様に行なつた。
測定結果を第１表に示す。
比較例 ２
吸湿量0.3％以下の６ナイロンパウダー13部と
ストロンチウムフエライト87部を水を添加せずに
混練混合し、他は実施例１と同様に行なつた。測
定結果を第１表に示す。
The present invention relates to a method for producing a resin magnet molding material that allows molded products with high magnetic properties to be obtained. Conventionally, resin magnets have been made using synthetic resins such as polyamide resin as a matrix and ferrite (MO・
It is obtained by injection molding a molding material made by mixing and kneading ferromagnetic powder such as 6Fe 2 O 3 (M is Sr or Ba) while applying a magnetic field. The polyamide used for the molding material is dried to avoid adverse effects on the molded product, and the moisture absorption is usually 0.25.
%, preferably 0.01% or less. In order to improve the magnetic properties of a molded article, it is necessary to fill it with a large amount of ferromagnetic powder and to make it highly oriented. However, if a large amount of ferromagnetic powder is filled, the melt viscosity of the molding material increases, making injection molding impossible, and even when a magnetic field is applied, the ferromagnetic powder is not sufficiently oriented, making it difficult to obtain a molded product with high magnetic properties. I couldn't do it. An object of the present invention is to provide a resin magnet molding material that can be molded well even when filled with a large amount of ferromagnetic powder, and can yield molded products with high magnetic properties. In order to achieve the above object, the present invention provides that when polyamide as a matrix and ferromagnetic powder are mixed and kneaded, the polyamide is
It is characterized by absorbing moisture or adding water in an amount exceeding %. In the pellet-like or powder-like molding material thus obtained, the synthetic resin is heated above its melting point during mixing and kneading, and hydrolyzed by the addition of water, resulting in a low-molecular-weight, low-viscosity product. Furthermore, water also has the effect of a plasticizer, and when injection molding this molding material, even if a large amount of ferromagnetic powder is filled, the viscosity does not become high and the molding can be performed satisfactorily. Therefore, by injection molding in a magnetic field, the ferromagnetic powder is highly oriented, and a molded resin magnet with high magnetic properties can be obtained. Next, examples of the present invention will be described. Example 1 Melt viscosity 1500 poise (250℃, 100sec -1 ) 6
11 parts by weight of nylon powder (hereinafter simply referred to as parts),
Strontium ferrite (SrO・6Fe 2 O 3 ) 89
1 part and 0.1 part of water were mixed in a super mixer. This mixture was kneaded and mixed in a twin-screw extruder kept at a temperature higher than the melting point of nylon 6 to obtain a molding material in the form of pellets. Using this molding material, a specimen (20φ×10 H ) for measuring magnetic properties was obtained using a magnetic field injection molding machine. The magnetic properties of the sample were measured using a BH tracer, and the results are shown in Table 1 along with the melt viscosity and strontium ferrite orientation rate of the molding material. Example 2 The same procedure as in Example 1 was carried out using nylon 6 powder that had been left in an atmosphere at room temperature and humidity for 24 hours or more to absorb moisture to an equilibrium moisture content (approximately 3%), but without adding water. Ta. The measurement results are shown in Table 1. Example 3 The procedure of Example 1 was repeated except that 1 part of water was added. The measurement results are shown in Table 1. Comparative Example 1 Using nylon 6 powder with moisture absorption of 0.3% or less,
The same procedure as in Example 1 was carried out except that water was not added.
The measurement results are shown in Table 1. Comparative Example 2 13 parts of nylon 6 powder having a moisture absorption of 0.3% or less and 87 parts of strontium ferrite were kneaded and mixed without adding water, but the process was the same as in Example 1 except that the mixture was kneaded and mixed without adding water. The measurement results are shown in Table 1.
【表】
第１表から明らかなように、本発明によればポ
リアミドと強磁性体粉末の混合混練に際して、ポ
リアミドの重量に対して３％を越える量で水を積
極的に存在させるという簡単な方法で、強磁性体
粉末を多量に充填しても成形材料の溶融粘度が低
く、高磁気特性の樹脂磁石成形品を提供すること
ができ、その工業的価値は極めて大なるものであ
る。[Table] As is clear from Table 1, according to the present invention, when mixing and kneading polyamide and ferromagnetic powder, water is actively present in an amount exceeding 3% based on the weight of the polyamide. By this method, even if a large amount of ferromagnetic powder is filled, the melt viscosity of the molding material is low and a resin magnet molded product with high magnetic properties can be provided, and its industrial value is extremely large.
Claims (1)
粉末をポリアミドの融点以上で混合混練する際、
ポリアミドにその重量に対して0.3％を越える量
で吸湿させるか水を添加することを特徴とする樹
脂磁石成形材料の製造法。1 When mixing and kneading polyamide as a matrix and ferromagnetic powder at a temperature higher than the melting point of the polyamide,
A method for producing a resin magnet molding material, which comprises making polyamide absorb moisture or adding water in an amount exceeding 0.3% based on its weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20482682A JPS5993737A (en) | 1982-11-22 | 1982-11-22 | Manufacture of molding material of resin magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20482682A JPS5993737A (en) | 1982-11-22 | 1982-11-22 | Manufacture of molding material of resin magnet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5993737A JPS5993737A (en) | 1984-05-30 |
| JPH0234986B2 true JPH0234986B2 (en) | 1990-08-07 |
Family
ID=16497020
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20482682A Granted JPS5993737A (en) | 1982-11-22 | 1982-11-22 | Manufacture of molding material of resin magnet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5993737A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4562487B2 (en) * | 2004-10-14 | 2010-10-13 | 株式会社ブリヂストン | Resin magnet composition, method for producing the same, and magnet roller |
| JP4498154B2 (en) | 2005-01-27 | 2010-07-07 | ファナック株式会社 | Motor manufacturing method and motor manufacturing apparatus |
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 |
-
1982
- 1982-11-22 JP JP20482682A patent/JPS5993737A/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 |
|---|---|
| JPS5993737A (en) | 1984-05-30 |
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