JP3525232B2 - Nylon resin composition containing magnetic powder and magnet roll using the same - Google Patents
Nylon resin composition containing magnetic powder and magnet roll using the sameInfo
- Publication number
- JP3525232B2 JP3525232B2 JP16486995A JP16486995A JP3525232B2 JP 3525232 B2 JP3525232 B2 JP 3525232B2 JP 16486995 A JP16486995 A JP 16486995A JP 16486995 A JP16486995 A JP 16486995A JP 3525232 B2 JP3525232 B2 JP 3525232B2
- Authority
- JP
- Japan
- Prior art keywords
- nylon resin
- magnetic powder
- amorphous
- resin
- resin composition
- 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
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
【０００１】[0001]
【産業上の利用分野】本発明は、ボンド磁石成形用の磁
性粉配合ナイロン樹脂組成物とこの材料を押出成形して
得られるマグネットロールに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic powder-blended nylon resin composition for forming a bonded magnet and a magnet roll obtained by extruding this material.
【０００２】[0002]
【従来の技術】ボンド磁石は焼結磁石に代わるものとし
て各種用途に使用されている。特に電子部品には多く利
用されており、例えば複写機、レーザープリンタ等に組
み込まれるマグネットロールではそのほとんどがボンド
磁石製である。一般に、ボンド磁石成形材料である磁性
粉配合ナイロン樹脂組成物に用いるナイロン樹脂として
は従来、結晶性樹脂であるナイロン６又はナイロン１２
のいずれかが使用されてきた。2. Description of the Related Art Bonded magnets are used in various applications as an alternative to sintered magnets. In particular, it is widely used for electronic parts, and most of magnet rolls incorporated in copying machines, laser printers, etc. are made of bonded magnets. Generally, as a nylon resin used in a magnetic powder-blended nylon resin composition which is a bonded magnet molding material, conventionally, a crystalline resin such as nylon 6 or nylon 12 is used.
One of them has been used.
【０００３】[0003]
【発明が解決しようとする課題】ナイロン６及びナイロ
ン１２は耐熱性に優れ、しかも低コストであることから
ボンド磁石成形材料として適しているのであるが、その
成形法が射出成形法に限定され、押出成形法が適用しに
くく、生産性が劣るという問題点があった。即ち、上記
材料で作製した押出成形品には表面荒れやクラックが目
立ち外観及び磁気特性に劣る。また、この成形品は脆い
ため落下衝撃強度にも劣る。このように押出成形法によ
って得られる成型品は製品としての条件を満足すること
ができない。しかも成型可能な温度幅も極めて狭く成型
時の温度管理も極めて難しい。特に高磁力の製品を得る
目的で、磁性粉を高充填した場合、このような傾向は著
しく、従って従来、押出成形法によってマグネットロー
ル用の磁性粉配合ナイロン樹脂成形品が工業的に生産さ
れたことはない。Nylon 6 and nylon 12 are suitable as a bond magnet molding material because they have excellent heat resistance and low cost, but the molding method is limited to the injection molding method. There is a problem that the extrusion molding method is difficult to apply and the productivity is poor. That is, surface roughness and cracks are conspicuous in the extruded product made of the above materials, and the appearance and magnetic properties are inferior. Further, since this molded product is brittle, it is also inferior in drop impact strength. As described above, the molded product obtained by the extrusion molding method cannot satisfy the conditions as a product. Moreover, the temperature range in which molding is possible is extremely narrow, and temperature control during molding is extremely difficult. This tendency is remarkable when the magnetic powder is highly filled especially for the purpose of obtaining a product having a high magnetic force. Therefore, conventionally, a magnetic powder-blended nylon resin molded product for a magnet roll was industrially produced by an extrusion molding method. There is no such thing.
【０００４】本発明はかかる現況に鑑みてなされたもの
であり、押出成形性が良好であり、押出成形法により成
形品を得たときにその成形品の外観、磁気特性が優れ、
しかも寸法安定性及び衝撃強度も優れたものとすること
ができるボンド磁石成形用の組成物を提案せんとするも
ので、併せてこのような組成物を用いた押出成形物とし
ての量産性に優れたマグネットロールを提案せんとする
ものである。The present invention has been made in view of the above circumstances, has excellent extrusion moldability, and when a molded product is obtained by an extrusion molding method, the molded product has excellent appearance and magnetic properties,
In addition, we propose a composition for forming bonded magnets that can also have excellent dimensional stability and impact strength, and at the same time, have excellent mass productivity as an extruded product using such a composition. It is intended to propose a magnet roll.
【０００５】[0005]
【課題を解決するための手段】本発明者は研究の結果、
上記課題は、結晶性ナイロン樹脂の一部に非晶性ナイロ
ン樹脂を特定の配合比率でブレンドすることによって解
決できることを見出し、本発明を完成させたものであ
る。本発明の磁性粉配合ナイロン樹脂組成物は、ナイロ
ン樹脂と磁性粉からなる樹脂組成物であって、ナイロン
樹脂が、結晶性樹脂であるナイロン６が６０〜９５重量
％と非晶性ナイロン樹脂が５〜４０重量％との混合物で
あり、前記非晶性ナイロン樹脂が芳香族系非晶性ナイロ
ン樹脂あるいは脂環族系非晶性ナイロン樹脂であり、前
記磁性粉がフェライトであり、組成物中の前記フェライ
トの含有率が８５〜９１重量％であるマグネットロール
押出成形用であることを特徴としている。前記芳香族系
非晶性ナイロン樹脂あるいは脂環族系非晶性ナイロン樹
脂は、ポリアミド骨格に結晶化を阻害するような構造を
有するモノマー成分を導入してあり、ポリマーの結晶化
がほとんど起こらないか、あるいは結晶化速度が非常に
小さい。As a result of the research, the present inventor has found that
The inventors have found that the above problems can be solved by blending a part of the crystalline nylon resin with the amorphous nylon resin at a specific blending ratio, and have completed the present invention. The magnetic powder-blended nylon resin composition of the present invention is a resin composition comprising a nylon resin and magnetic powder, wherein the nylon resin comprises 60 to 95% by weight of nylon 6, which is a crystalline resin, and an amorphous nylon resin. 5 to 40% by weight, wherein the amorphous nylon resin is an aromatic amorphous nylon.
Resin or alicyclic amorphous nylon resin , the magnetic powder is ferrite, and the content of the ferrite in the composition is 85 to 91% by weight for magnet roll extrusion molding. I am trying. The aromatic system
Amorphous nylon resin or alicyclic amorphous nylon resin
The fat has a monomer component having a structure that inhibits crystallization introduced into the polyamide skeleton, and the crystallization of the polymer hardly occurs, or the crystallization rate is very low.
【０００６】非晶性ナイロン樹脂としては芳香族系非晶
性ナイロン樹脂あるいは脂環族系非晶性ナイロン樹脂が
好ましい。The amorphous nylon resin is preferably an aromatic amorphous nylon resin or an alicyclic amorphous nylon resin.
【０００７】磁性粉としてはフェライトが低コストであ
ることから好ましく、その組成物中の含有率は８５〜９
１重量％に設定することが望まれる。Ferrite is preferable as the magnetic powder because of its low cost, and its content in the composition is 85 to 9
It is desirable to set it to 1% by weight.
【０００８】磁性粉ナイロン樹脂組成物の溶融粘度は、
温度２５０℃、剪断速度１０ｓｅｃ -1の条件で２×１０
5 ポイズ〜２×１０6 ポイズに設定することが好まし
い。The melt viscosity of the magnetic powder nylon resin composition is
Temperature 250 ℃, shear rate 10 sec -12 × 10 under the condition
FivePoise ~ 2 × 106Preference is preferred
Yes.
【０００９】本発明のマグネットロールは上述の磁性粉
配合ナイロン樹脂組成物を押出成形することによって作
製される。The magnet roll of the present invention is produced by extrusion molding the above-mentioned magnetic powder-blended nylon resin composition.
【００１０】[0010]
【作用】ナイロン６等の結晶性樹脂は耐熱性に優れ磁性
粉の高充填が可能である反面、押出成形性に難点があ
り、非晶性ナイロン樹脂は押出成形は可能であるが、耐
熱性が低く、耐熱性を高めるために分子構造の剛直化を
はかると磁性粉の高充填がはかれない問題がある。この
ように結晶性ナイロン樹脂と非晶性ナイロン樹脂にはそ
れぞれ一長一短があるが、本発明の磁性粉配合ナイロン
樹脂組成物のようにナイロン６に非晶性ナイロン樹脂を
特定の配合比率で配合することによってそれぞれの長所
のみを顕在化させた磁性粉ナイロン樹脂組成物を得るこ
とができる。即ち、耐熱性に優れるとともに押出成形性
が良好であり且つ磁性粉の高充填も可能な磁性粉ナイロ
ン樹脂組成物が得られる。そしてこの素材を押出成形し
て得られる成形品は外観、磁気特性に優れ且つ寸法安定
性及び衝撃強度にも優れている。また成形可能な温度幅
も広い。ナイロン６と非晶性ナイロン樹脂を特定の配合
比率で配合したことによる衝撃強度の向上効果は極めて
特異な現象である。磁性粉が配合されていない系におい
てはナイロン６と非晶性ナイロン樹脂を配合しても衝撃
強度の向上効果はない。衝撃強度の向上は磁性粉が配合
された系に固有の現象であり、この現象の発見が本発明
の契機となっている。[Function] While crystalline resin such as nylon 6 is excellent in heat resistance and can be highly filled with magnetic powder, it has a drawback in extrudability. Amorphous nylon resin can be extruded but is heat resistant. However, if the molecular structure is made rigid to increase the heat resistance, there is a problem that the magnetic powder cannot be highly filled. As described above, each of the crystalline nylon resin and the amorphous nylon resin has advantages and disadvantages. However, like the magnetic powder-blended nylon resin composition of the present invention, nylon 6 is blended with the amorphous nylon resin in a specific blending ratio. As a result, it is possible to obtain a magnetic powder nylon resin composition in which only the respective advantages are revealed. That is, it is possible to obtain a magnetic powder nylon resin composition which is excellent in heat resistance, has good extrusion moldability, and can be highly filled with magnetic powder. A molded product obtained by extrusion molding this material has excellent appearance, magnetic properties, dimensional stability and impact strength. In addition, the temperature range in which molding is possible is wide. The effect of improving impact strength by blending nylon 6 and amorphous nylon resin in a specific blending ratio is a very unique phenomenon. In a system in which no magnetic powder is blended, blending Nylon 6 and an amorphous nylon resin has no effect of improving impact strength. The improvement of impact strength is a phenomenon peculiar to a system containing magnetic powder, and the discovery of this phenomenon is a trigger of the present invention.
【００１１】請求項５記載のマグネットロールは磁性粉
ナイロン樹脂組成物を円筒状又は円柱状に押出し、押し
出された連続長尺体を所定長さ単位で切断して作製す
る。A magnet roll according to a fifth aspect is manufactured by extruding a magnetic powder nylon resin composition into a cylindrical shape or a columnar shape, and cutting the extruded continuous elongated body into a predetermined length unit.
【００１２】[0012]
【実施例】次に本発明の詳細を実施例に基づき説明す
る。本発明の磁性粉ナイロン樹脂組成物は結晶性樹脂で
あるナイロン６を６０〜９５重量％、非晶性ナイロン樹
脂を５〜４０重量％の割合で混合したものに磁性粉を配
合している。ナイロン６は、ε−ポリカプロラクタムを
開環重合させることにより合成される線状ポリマーであ
り、ポリマー骨格内に規則正しく繰り返されるアミド結
合による水素結合のため結晶化が起こりやすい性質を有
している。非晶性ナイロン樹脂を配合するのは、この結
晶化しやすい性質を改質することが主たる目的である。
結晶性ナイロン樹脂のなかでも特にナイロン６を選択し
たのは、ナイロン６は各種ナイロンの中で最も安価であ
り、磁性粉の高充填が可能な性質を有するからである。EXAMPLES Next, details of the present invention will be described based on examples. In the magnetic powder nylon resin composition of the present invention, magnetic powder is blended with a mixture of crystalline resin nylon 6 at 60 to 95% by weight and amorphous nylon resin at 5 to 40% by weight. Nylon 6 is a linear polymer synthesized by subjecting ε-polycaprolactam to ring-opening polymerization, and has a property that crystallization is likely to occur due to hydrogen bonds by regularly repeating amide bonds in the polymer skeleton. The main purpose of compounding the amorphous nylon resin is to modify the property of easily crystallizing.
Among the crystalline nylon resins, nylon 6 is particularly selected because nylon 6 is the cheapest of various nylons and has the property of being able to be highly filled with magnetic powder.
【００１３】非晶性ナイロン樹脂としては例えば芳香族
系非晶性ナイロン樹脂あるいは脂環族系非晶性ナイロン
樹脂が使用できる。芳香族系非晶性ナイロン樹脂とは非
晶化するためのモノマーとして例えば、テレフタル酸、
イソフタル酸のような芳香族環を有する酸あるいはアミ
ンを含んでいるものを指す。また脂環族系非晶性ナイロ
ン樹脂とは非晶化するためのモノマーとして例えば、シ
クロヘキサン−１、４−ジカルボン酸、ビス−ｐ−（ア
ミノシクロヘキシル）メタン、ビス−ｐ−（アミノシク
ロヘキシル）プロパン、イソフォロンジアミンのような
脂肪族環を有する酸あるいはアミンを含んでいるものを
指している。非晶性ナイロン樹脂として芳香族系非晶性
ナイロン樹脂及び脂環族系非晶性ナイロン樹脂を選択し
たのは、これら樹脂は脂肪族系非晶性ナイロン樹脂に比
べて耐熱性や寸法安定性に優れており、ナイロン６と混
合した後もこの性質を維持し続けることができるためで
ある。As the amorphous nylon resin, for example, an aromatic amorphous nylon resin or an alicyclic amorphous nylon resin can be used. Aromatic amorphous nylon resin is a monomer for amorphizing, for example, terephthalic acid,
It refers to those containing an acid having an aromatic ring such as isophthalic acid or an amine. Further, the alicyclic amorphous nylon resin is, for example, cyclohexane-1,4-dicarboxylic acid, bis-p- (aminocyclohexyl) methane, bis-p- (aminocyclohexyl) propane as a monomer for amorphizing. , Those containing an acid or amine having an aliphatic ring such as isophorone diamine. Aromatic amorphous nylon resins and alicyclic amorphous nylon resins were selected as the amorphous nylon resins because these resins have higher heat resistance and dimensional stability than aliphatic amorphous nylon resins. This is because, even after mixing with nylon 6, this property can be maintained.
【００１４】ナイロン６と非晶性ナイロン樹脂との配合
比率は、ナイロン６が６０〜９５重量％であり、非晶性
ナイロン樹脂が５〜４０重量％の範囲である。非晶性ナ
イロン樹脂の配合比率が５重量％未満では押出成形性が
悪く成形品にクラックが生じたり製品として許容できな
い表面荒れが生じたりする。また、成形品の衝撃強度も
向上しない。他方、４０重量％を超えた場合、非晶性ナ
イロン樹脂が芳香族系非晶性ナイロン樹脂や脂環族系非
晶性ナイロン樹脂の場合は磁性粉の高充填が出来なくな
って高磁力な成形品が得られず、また非晶性ナイロン樹
脂が脂肪族系非晶性ナイロン樹脂である場合は磁性粉の
高充填に問題はないものの耐熱性が低下する。The blending ratio of nylon 6 and amorphous nylon resin is such that nylon 6 is 60 to 95% by weight and amorphous nylon resin is 5 to 40% by weight. If the blending ratio of the amorphous nylon resin is less than 5% by weight, the extrusion moldability is poor and the molded product is cracked or the surface is unacceptable as a product. Also, the impact strength of the molded product is not improved. On the other hand, when the content exceeds 40% by weight, when the amorphous nylon resin is an aromatic amorphous nylon resin or an alicyclic amorphous nylon resin, high filling of magnetic powder cannot be performed and high magnetic force molding is performed. No product is obtained, and when the amorphous nylon resin is an aliphatic amorphous nylon resin, there is no problem with high filling of the magnetic powder, but the heat resistance decreases.
【００１５】磁性粉としてはフェライト磁粉、アルニコ
磁粉、希土類磁粉等の磁気異方性を有する強磁性粉を用
いることができるが、フェライト磁粉を用いることがコ
スト上有利である。フェライト磁粉の組成物中の含有率
は８５〜９１重量％に設定することが好ましい。フェラ
イト磁粉の含有率が８５重量％未満であると、磁性粉の
含有不足による磁気特性の低下が起こり、例えばマグネ
ットロールとしての使用に適しなくなる。またフェライ
ト磁粉の含有率が９１重量％を越えると成形性が低下す
ると同時に、磁粉同士の接触頻度が増えて自由な配向が
妨げられ、これにより磁気特性が低下する。Ferromagnetic powder having magnetic anisotropy such as ferrite magnetic powder, alnico magnetic powder and rare earth magnetic powder can be used as the magnetic powder, but the use of ferrite magnetic powder is advantageous in cost. The content of the ferrite magnetic powder in the composition is preferably set to 85 to 91% by weight. If the content of the ferrite magnetic powder is less than 85% by weight, the magnetic properties will be deteriorated due to the insufficient content of the magnetic powder, and it will not be suitable for use as, for example, a magnet roll. Further, when the content of the ferrite magnetic powder exceeds 91% by weight, the formability is deteriorated, and at the same time, the frequency of contact between the magnetic powders is increased to hinder the free orientation, thereby deteriorating the magnetic characteristics.
【００１６】またこれら主原料以外に、ナイロン樹脂と
磁性粉との濡れ性を改善するためにシランカップリング
剤等の表面処理剤を添加して磁性粉を処理することが好
ましい。更に滑剤、安定剤、可塑剤、難燃剤等を必要に
応じて適宜添加することができる。In addition to these main raw materials, it is preferable to treat the magnetic powder by adding a surface treatment agent such as a silane coupling agent in order to improve the wettability between the nylon resin and the magnetic powder. Further, a lubricant, a stabilizer, a plasticizer, a flame retardant and the like can be added as required.
【００１７】このような成分構成の磁性粉ナイロン樹脂
組成物はその溶融粘度を温度２５０℃、剪断速度１０ｓ
ｅｃ-1の条件下で２×１０5 ポイズ〜２×１０6 ポイズ
に設定する。粘度が２×１０5 ポイズ未満の場合、磁場
配向押出成形では高い磁気特性の成形品が得られない。
これは粘度が低いため成形ダイの出口以降における冷却
固化過程において、押出物の変形や流動が起きやすく、
磁性粉の配向の乱れが発生するためと思われる。他方、
粘度が２×１０6 ポイズを越えると押出機の負荷が上が
り押出し困難となったり、押出しが可能でも表面荒れが
生じやすく良好な外観の成形品を得ることができず、磁
気特性も低下する。The magnetic powder nylon resin composition having such a composition has a melt viscosity of 250 ° C. and a shear rate of 10 s.
Set to 2 × 10 5 poise to 2 × 10 6 poise under the condition of ec −1 . If the viscosity is less than 2 × 10 5 poise, a magnetic field oriented extrusion molding cannot obtain a molded article having high magnetic properties.
This is because the viscosity is low, deformation and flow of the extrudate easily occur in the cooling and solidifying process after the exit of the molding die,
It seems that the orientation of the magnetic powder is disturbed. On the other hand,
If the viscosity exceeds 2 × 10 6 poise, the load of the extruder increases and extrusion becomes difficult. Even if extrusion is possible, surface roughness is apt to occur and a molded product with a good appearance cannot be obtained, and the magnetic properties deteriorate.
【００１８】溶融粘度を高めるには非晶性ナイロン樹脂
の割合を増やすこと、磁性粉の充填量を増やすこと、あ
るいはナイロンの分子量を大きくする等の方法がある
が、ナイロン６あるいは非晶性ナイロン樹脂の分子量を
適宜選択することで粘度調整を行うことが現実的であ
る。To increase the melt viscosity, there are methods such as increasing the proportion of the amorphous nylon resin, increasing the filling amount of the magnetic powder, and increasing the molecular weight of nylon. Nylon 6 or amorphous nylon It is practical to adjust the viscosity by appropriately selecting the molecular weight of the resin.
【００１９】このような磁性粉ナイロン樹脂組成物を用
いて高磁力のマグネットロールを成形する方法としては
磁場配向押出成形法が最も適し、そのなかでも特に湿式
真空サイジング方式の磁場配向押出成形法が適してい
る。湿式真空サイジング装置方式の磁場配向押出成形法
とは、成形ダイから押し出した押出物を、内面に冷媒を
流通させたサイジングダイ内に通し、押出物とサイジン
グダイとの接触摩擦を冷媒により軽減しながら急冷する
方法であり、前段の磁場配向成形工程によって配向され
た押出物表面付近の磁性粉配列を乱すことなく急冷する
ことができる方法である。A magnetic field oriented extrusion molding method is most suitable as a method for molding a magnet roll of high magnetic force using such a magnetic powder nylon resin composition. Among them, the wet vacuum sizing method magnetic field oriented extrusion molding method is particularly preferable. Are suitable. The magnetic field oriented extrusion molding method of the wet vacuum sizing system is an extrudate extruded from a molding die, which is passed through a sizing die in which a refrigerant is circulated on the inner surface, and the contact friction between the extrudate and the sizing die is reduced by the refrigerant. However, it is a method of quenching, and it is a method of quenching without disturbing the arrangement of the magnetic powder in the vicinity of the surface of the extrudate oriented by the magnetic field orientation forming step in the preceding stage.
【００２０】以下、本発明の効果を確かめるために行っ
た本発明品と従来品との比較試験について述べる。表１
に示す組成のものをヘンシェルミキサーで混合攪拌し、
二軸押出機で混練しペレットを作製した。このものを単
軸押出機で磁場配向下で押出成形を行い、湿式真空サイ
ジング装置で冷却後、一定長さに切断し、外径１３．６
ｍｍφ、内径５．４ｍｍφ、長さ２５０ｍｍの中空円筒
状の成形品を得た。成形品の外観、落下衝撃強度、磁気
特性を評価した結果を表２に示す。サンプル数は２０本
である。尚、表１中の相対粘度はＪＩＳ−Ｋ６８１０の
試験法に依った。また溶融粘度は温度２５０℃、剪断速
度１０ｓｅｃ-1の条件下で高化式フローテスタ法により
測定した。芳香族系非晶性ナイロン樹脂Ａは「三井・デ
ュポンポリケミカル株式会社製 シーラーＰＡ３５０
８」、芳香族系非晶性ナイロン樹脂Ｂは「東洋紡績株式
会社製 Ｔ−７１４Ｅ」、脂肪族系非晶性ナイロン樹脂
は「ユニチカ株式会社製 ＣＸ−１００４」、シランカ
ップリング剤は「日本ユニカー株式会社製Ａ−１１０
０」、滑剤は「ステアリン酸リチウム」を用いた。また
表中、「非晶性ナイロン樹脂の比率」とあるのは、結晶
性ナイロン樹脂と非晶性ナイロン樹脂の合計量に対する
非晶性ナイロン樹脂の比率（重量％）である。Hereinafter, a comparative test between the product of the present invention and the conventional product for confirming the effect of the present invention will be described. Table 1
Mix and stir with the composition shown in Henschel mixer,
The pellets were produced by kneading with a twin-screw extruder. This product is extrusion-molded in a magnetic field orientation with a single-screw extruder, cooled with a wet vacuum sizing device, and then cut into a certain length to have an outer diameter of 13.6.
A hollow cylindrical molded product having an mmφ, an inner diameter of 5.4 mmφ and a length of 250 mm was obtained. Table 2 shows the results of evaluating the appearance, drop impact strength, and magnetic properties of the molded product. The number of samples is 20. The relative viscosity in Table 1 depends on the test method of JIS-K6810. The melt viscosity was measured by a Koka type flow tester method under the conditions of a temperature of 250 ° C. and a shear rate of 10 sec −1 . Aromatic amorphous nylon resin A is "Mitsui DuPont Polychemical Co., Ltd. Sealer PA350
8 ", the aromatic amorphous nylon resin B is" T-714E "manufactured by Toyobo Co., Ltd., the aliphatic amorphous nylon resin is" CX-1004 manufactured by Unitika Ltd. ", and the silane coupling agent is" Japan ". Unicar Corporation A-110
0 "and the lubricant used was" lithium stearate ". Further, in the table, "amount of amorphous nylon resin" means the ratio (% by weight) of the amorphous nylon resin to the total amount of the crystalline nylon resin and the amorphous nylon resin.
【００２１】表２の評価は以下の手法に依る。表面平滑
性及びクラックの程度を調べた外観検査は目視評価に依
った。落下衝撃強度（破壊率）試験は、高さ１ｍの地点
から成形品の軸芯を水平にした姿勢で成形品を落下させ
て成形品が折損するか否かを調べた。寸法安定性は成形
品の両端をスパン２３０ｍｍの自由端で支持した状態で
５０℃、２４時間保持し、室温に戻した後、中央部のた
わみの増加量で評価した。磁気特性は磁界の平均強度と
バラツキについて調べた。測定は成形品の表面か１．２
ｍｍ離れた地点での磁束密度を成形品の軸方向全長にわ
たって１００ｍｍ間隔で３箇所について測定し、これら
の平均値を磁界の平均強度とした。The evaluation of Table 2 is based on the following method. The visual inspection for the surface smoothness and the degree of cracking depended on visual evaluation. In the drop impact strength (destruction rate) test, it was examined whether or not the molded product was broken from a position at a height of 1 m in a posture in which the axis of the molded product was horizontal. The dimensional stability was evaluated by increasing the amount of deflection in the central part after holding the molded product at 50 ° C. for 24 hours with the both ends supported by free ends having a span of 230 mm and returning to room temperature. The magnetic characteristics were examined for the average strength and variation of the magnetic field. Is the surface of the molded product 1.2?
The magnetic flux densities at points separated by mm were measured at three points at 100 mm intervals over the entire length in the axial direction of the molded product, and the average value of these was taken as the average strength of the magnetic field.
【００２２】[0022]
【表１】 [Table 1]
【００２３】[0023]
【表２】 [Table 2]
【００２４】試験結果にも現れているように、非晶性ナ
イロン樹脂を含まない比較例１や非晶性ナイロン樹脂の
配合比率が５重量％未満である比較例２では成形品にク
ラックが生じたり製品として許容できない表面荒れが生
じる。また、成形品の衝撃強度も低く、磁気特性も劣っ
ている。他方、芳香族系非晶性ナイロン樹脂の配合比率
が４０重量％を越えている比較例３及び比較例４でもク
ラックや表面荒れが発生した。また衝撃強度や磁気特性
も劣っている。これに対して本発明の実施例である実施
例１〜８は成形品の外観、磁気特性ともに優れ、しかも
寸法安定性及び衝撃強度も優れている。As shown in the test results, in Comparative Example 1 containing no amorphous nylon resin and Comparative Example 2 containing less than 5% by weight of the amorphous nylon resin, cracks were formed in the molded product. Or surface roughness that is unacceptable as a product occurs. Moreover, the impact strength of the molded product is low and the magnetic properties are inferior. On the other hand, cracks and surface roughness also occurred in Comparative Examples 3 and 4 in which the compounding ratio of the aromatic amorphous nylon resin exceeded 40% by weight. The impact strength and magnetic properties are also poor. On the other hand, Examples 1 to 8, which are Examples of the present invention, are excellent in appearance and magnetic properties of the molded product, and are also excellent in dimensional stability and impact strength.
【００２５】[0025]
【発明の効果】本発明によれば、押出成形性が良好であ
り、押出成形法により成形品を得たときにその成形品の
外観、磁気特性が優れ、しかも寸法安定性及び衝撃強度
も優れたものとすることができる磁性粉配合ナイロン樹
脂組成物が得られる。そしてこの組成物を用いて押出成
形によって作製される本マグネットロールは量産性に優
れる。また、フェライト磁粉を用いることで、低コスト
化がはかれる。そしてこのようなフェライト磁粉の含有
率を８５〜９１重量％に設定することにより優れた磁気
特性が発揮される。 INDUSTRIAL APPLICABILITY According to the present invention, extrusion moldability is good, and when a molded product is obtained by an extrusion molding method, the molded product has excellent appearance and magnetic properties, and also has excellent dimensional stability and impact strength. A nylon resin composition containing magnetic powder can be obtained. The present magnet roll produced by extrusion molding using this composition is excellent in mass productivity. Also, by using ferrite magnet powder, low cost
It can be changed. And the inclusion of such ferrite magnetic powder
By setting the rate to 85-91% by weight, excellent magnetic properties
The characteristics are demonstrated.
【００２６】請求項２記載のように非晶性ナイロン樹脂
として芳香族系非晶性ナイロン樹脂及び脂環族系非晶性
ナイロン樹脂を選択した場合は、耐熱性や寸法安定性が
より優れたものとなる。When an aromatic amorphous nylon resin or an alicyclic amorphous nylon resin is selected as the amorphous nylon resin as described in claim 2, the heat resistance and the dimensional stability are more excellent. Will be things.
【００２７】[0027]
【００２８】また請求項２記載のように磁性粉ナイロン
樹脂組成物の溶融粘度を温度２５０℃、剪断速度１０ｓ
ｅｃ-1の条件下で２×１０5ポイズ〜２×１０6ポイズに
設定することにより、表面荒れを防止しつつ押出物の変
形をより確実に防止できる。The melt viscosity of the magnetic powder nylon resin composition as set forth in claim 2 is 250 ° C. at a shear rate of 10 s.
By setting to 2 × 10 5 poises to 2 × 10 6 poises under the condition of ec −1 , it is possible to more reliably prevent deformation of the extrudate while preventing surface roughness.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) C08L 1/00 - 101/14 ─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. 7 , DB name) C08L 1/00-101/14
Claims (3)
物であって、ナイロン樹脂が、結晶性樹脂であるナイロ
ン６が６０〜９５重量％と非晶性ナイロン樹脂が５〜４
０重量％との混合物であり、前記非晶性ナイロン樹脂が
芳香族系非晶性ナイロン樹脂あるいは脂環族系非晶性ナ
イロン樹脂であり、前記磁性粉がフェライトであり、組
成物中の前記フェライトの含有率が８５〜９１重量％で
あるマグネットロール押出成形用の磁性粉配合ナイロン
樹脂組成物。1. A resin composition comprising a nylon resin and magnetic powder, wherein the nylon resin is 60 to 95% by weight of a crystalline resin, nylon 6, and 5 to 4 of an amorphous nylon resin.
0% by weight, wherein the amorphous nylon resin is
Aromatic amorphous nylon resin or alicyclic amorphous amorphous resin
A magnetic powder-blended nylon resin composition for magnet roll extrusion molding, which is an iron resin , the magnetic powder is ferrite, and the content of the ferrite in the composition is 85 to 91% by weight.
度が温度２５０℃、剪断速度１０ｓｅｃ -1 の条件で２×
１０ 5 ポイズ〜２×１０ 6 ポイズである請求項１記載の磁
性粉配合ナイロン樹脂組成物。2. A melt viscosity of a nylon resin composition containing magnetic powder.
2 × under conditions of a temperature of 250 ° C. and a shear rate of 10 sec −1
The nylon resin composition containing magnetic powder according to claim 1, which has a porosity of 10 5 to 2 × 10 6 .
ン樹脂組成物を押出成形して得たマグネットロール。3. A magnetic powder-containing Niro according to claim 1 or 2.
A magnet roll obtained by extruding a resin composition .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16486995A JP3525232B2 (en) | 1995-06-30 | 1995-06-30 | Nylon resin composition containing magnetic powder and magnet roll using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16486995A JP3525232B2 (en) | 1995-06-30 | 1995-06-30 | Nylon resin composition containing magnetic powder and magnet roll using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0912869A JPH0912869A (en) | 1997-01-14 |
| JP3525232B2 true JP3525232B2 (en) | 2004-05-10 |
Family
ID=15801477
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16486995A Expired - Fee Related JP3525232B2 (en) | 1995-06-30 | 1995-06-30 | Nylon resin composition containing magnetic powder and magnet roll using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3525232B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6872325B2 (en) | 2002-09-09 | 2005-03-29 | General Electric Company | Polymeric resin bonded magnets |
| JP2010248417A (en) * | 2009-04-17 | 2010-11-04 | Mitsubishi Gas Chemical Co Inc | Thermoplastic resin composition with excellent barrier property |
-
1995
- 1995-06-30 JP JP16486995A patent/JP3525232B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0912869A (en) | 1997-01-14 |
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