JPS61120340A - Magnetic recording medium and its production - Google Patents

Abstract

PURPOSE:To decrease coefft. of friction and to improve simultaneously and considerably durability by providing an adsorption layer of a perfluoroalkyl carboxylic acid on a magnetic recording surface and providing further a lubricating layer consisting of fluorocarbon on the adsorption layer. CONSTITUTION:The adsorption layer of the perfluoroalkyl carboxylic acid is provided on the magnetic recording surface and the lubricating layer consisting of the fluorocarbon is provided on said layer. The formation of the adsorption film of the perfluoroalkyl carboxylic acid is possible by an immersion method as well as the formation by a vacuum deposition method is more preferable in terms of the ease of film thickness control. The coefft. of friction of the adsorption layer of the perfluoroalkyl carboxylic acid is improved as compared to the case in which said adsorption layer is not formed but the realization of the substantially low value is not possible. The adsorption layer of the perfluoroalkyl carboxylic acid is thereupon provided on the magnetic recording surface and thereafter the liquid lubricating layer consisting of the fluorocarbon such as perfluoroalkyl polyether is further provided on the adsorption layer in order to decrease the coefft. of friction.

Description

【発明の詳細な説明】 〔発明の利用分野および発明の目的〕 本発明は、磁気記録媒体の保護潤滑層の改良に係り、走
行性及び耐久性に優れた磁気記録媒体及びその製造方法
を提供することを目的とする。Detailed Description of the Invention [Field of Application and Object of the Invention] The present invention relates to improvement of a protective lubricant layer of a magnetic recording medium, and provides a magnetic recording medium with excellent running properties and durability, and a method for manufacturing the same. The purpose is to

−〔従来の技術〕 Ｃ０−Ｎ１あるいはＣＯ−Ｃｒをはじめとする金属薄膜
型磁気記録媒体は、高密度記録用媒体として注目され、
その優れた高密度記録性能が発揮される。しかし、Ｗｉ
布型磁気記録媒体と比較した場合、金属薄膜型磁気記録
媒体の走行性及び機械的耐久性は、まだ充分なものとは
いい難い、そこで上記２つの機械的特性を改善すべく種
々の保護潤滑層が検討されてきたが、２つの問題を同時
にかつ大幅に改善することは極めて困難であった。- [Prior art] Metal thin film magnetic recording media such as CO-N1 or CO-Cr have attracted attention as high-density recording media.
Its excellent high-density recording performance is demonstrated. However, Wi
When compared with fabric-type magnetic recording media, the runnability and mechanical durability of metal thin-film magnetic recording media are still far from satisfactory. Therefore, various protective lubricants have been developed to improve the above two mechanical properties. Although layers have been considered, it has been extremely difficult to significantly improve the two problems simultaneously.

例えば、磁気記録媒体の潤滑剤として最も一般的なフル
オロカーボン系の液体潤滑剤を用いた場合には、摩擦係
数を大幅に低減し、磁気ヘッドの走行性を改善できるが
、この潤滑剤の大きな欠点は磁気記録面に対する保護効
果が弱いことがあり、その結果、磁気記録媒体の耐久性
を充分に向上することができなかった。For example, when using a fluorocarbon-based liquid lubricant, which is the most common lubricant for magnetic recording media, it is possible to significantly reduce the friction coefficient and improve the running performance of the magnetic head, but this lubricant has a major drawback. may have a weak protective effect on the magnetic recording surface, and as a result, the durability of the magnetic recording medium could not be sufficiently improved.

〔問題点を解決するための手段〕[Means for solving problems]

本発明は、上述した従来技術の欠点を解消するもので、
磁気記録面上に膜面内方向の凝集力が強く、保護効果に
優れたパーフルオロアルキルカルボン酸の吸着層を例え
ば真空蒸着法などにより設け、該吸着層上に低摩擦係数
を示すフルオロカーボン系の潤滑層を設けることにより
、低摩擦状態を保持しつつ、磁気記録媒体の機械的耐久
性を向上するようにしている。The present invention solves the above-mentioned drawbacks of the prior art, and
An adsorption layer of perfluoroalkylcarboxylic acid, which has a strong cohesive force in the in-plane direction and has an excellent protective effect, is provided on the magnetic recording surface by, for example, vacuum evaporation. By providing the lubricating layer, the mechanical durability of the magnetic recording medium is improved while maintaining a low friction state.

本発明にいうパーフルオロアルキルカルボン酸は、Ｃｎ
Ｆ″″ｚｎ＋ｘ　Ｃ００Ｈ（ｎ：整数）の化学構造式を
有するものであって、ｎが３以上、特にｎが３〜９のも
のが膜面内方向の凝集力が大きく磁気記録面の保護効果
に優れている。なお、パーフルオロアルキルカルボン酸
吸着膜の形成法は、浸漬法によっても可能であるが、膜
厚制御が容易な点から真空蒸着法による形成がより好ま
しい。The perfluoroalkylcarboxylic acid referred to in the present invention is Cn
Those with the chemical structural formula F″″zn+x C00H (n: integer), where n is 3 or more, especially those where n is 3 to 9, have a large cohesive force in the in-plane direction and have a protective effect on the magnetic recording surface. Excellent. Although the perfluoroalkyl carboxylic acid adsorption film can be formed by a dipping method, it is more preferable to form the perfluoroalkyl carboxylic acid adsorption film by a vacuum evaporation method from the viewpoint of easy control of the film thickness.

以上、述べたように、パーフルオロアルキルカルボン酸
の吸着層は、凝集力が大きいため、磁気記録面をよく保
護し、記録媒体の耐久性を大幅に向上させるが、その摩
擦係数はその吸着層を形成しない場合に比べ改善はされ
るものの充分低い値を実現することはできない、そこで
本発明者等は。As mentioned above, the adsorption layer of perfluoroalkyl carboxylic acid has a large cohesive force, so it protects the magnetic recording surface well and greatly improves the durability of the recording medium, but the friction coefficient of the adsorption layer Although it is improved compared to the case where no ion is formed, it is not possible to achieve a sufficiently low value.

磁気記録面上にパーフルオロアルキルカルボン酸の吸着
層を設けた後、更に摩擦係数に低減化を目的とし、該吸
着層上にパーフルオロアルキルポリエーテルあるいはパ
ーフルオロポリエーテルなどのフルオロカーボン系の液
体潤滑層を設けること番こした。その結果、フルオロカ
ーボン系の液体潤滑剤がもつ低摩擦係数を保有し、かつ
耐久性に優れた磁気記録媒体を得ることができた。After providing an adsorption layer of perfluoroalkylcarboxylic acid on the magnetic recording surface, a fluorocarbon-based liquid lubricant such as perfluoroalkyl polyether or perfluoropolyether is applied on the adsorption layer to further reduce the coefficient of friction. I decided to add layers. As a result, it was possible to obtain a magnetic recording medium that possesses the low friction coefficient of a fluorocarbon liquid lubricant and has excellent durability.

〔実施例〕〔Example〕

以下１本発明を図面とともに実施例によって説明する。 The present invention will be explained below by way of examples along with drawings.

直径７５ｍｍ、板厚３腸欝のガラス基板１上にスパッタ
リングによりＣｏ　−Ｃｒの磁性金属薄膜２を形成した
ディスクを試料とし、該試料表面に膜厚約１２０人のＣ
ｓ　Ｆｚ　ｓ　Ｃ０ＯＨの吸着層３を真空蒸着法により
設けた後、該吸着層上にフルオロカーボン系潤滑剤（Ｄ
　ｕｐｏｎ社製品名にｒｙｔｏｘバーブルオロポリエー
テル）４を塗布した。なお上記磁気ディスクの摩擦係数
及び耐久性は１曲率３０■−のサファイア球面摺動子を
用い１周速２ｍ／秒、磁気ディスクへの球面摺動子の押
しつけ荷重を６ｇとして球面摺動試験を行い評価した。The sample is a disk in which a magnetic metal thin film 2 of Co-Cr is formed by sputtering on a glass substrate 1 with a diameter of 75 mm and a plate thickness of 3 mm.
After providing the adsorption layer 3 of s Fz s C0OH by vacuum evaporation method, a fluorocarbon lubricant (D
rytox (vaporopolyether) 4 (product name of Upon Co., Ltd.) was applied. The friction coefficient and durability of the above magnetic disk were determined by a spherical sliding test using a sapphire spherical slider with a curvature of 30 cm at a per-circumferential speed of 2 m/sec and a pressing load of the spherical slider against the magnetic disk of 6 g. and evaluated.

その試験結果を次の表１に示す、この表より、フルオロ
カーボン系の液体潤滑剤は摩擦低減に、またＣｓ　Ｆｉ
　−Ｉ　Ｃｏ。The test results are shown in Table 1 below. From this table, it can be seen that fluorocarbon-based liquid lubricants are effective in reducing friction, and Cs Fi
-I Co.

Ｈの吸着層は、磁気ディスクの耐久性向上に有効であり
、塗布潤滑層とＣ５Ｆ１うＣ０ＯＨの吸着層を組み合わ
せ、保護潤滑層を形成することにより、ａ！気ディスク
の摩擦特性及び耐久性がともに大幅に改善できることが
分る。The H adsorption layer is effective in improving the durability of magnetic disks, and by combining the coated lubricant layer and the C5F1 or C0OH adsorption layer to form a protective lubricant layer, a! It can be seen that both the frictional properties and durability of the air disc can be significantly improved.

表１ （塗布法） 〔発明の効果〕 以上、説明したように、磁気記録媒体の磁気記録面上に
パーフルオロアルキルカルボン酸の吸着層を設け、更に
該吸着層上にフルオロカーボン系の潤滑層を設けること
により、磁気記録媒体の摩擦係数を低減し、同時に耐久
性を大幅に改善できる。Table 1 (Coating method) [Effects of the invention] As explained above, an adsorption layer of perfluoroalkylcarboxylic acid is provided on the magnetic recording surface of a magnetic recording medium, and a fluorocarbon-based lubricating layer is further provided on the adsorption layer. By providing this, the coefficient of friction of the magnetic recording medium can be reduced, and at the same time, the durability can be significantly improved.

【図面の簡単な説明】[Brief explanation of drawings]

図は本発明の実施例に係る磁気記録媒体の断面図である
。 １・・・・・・ガラス基板、２・旧・・磁性金属薄膜、
３・・・・・・吸着層、４・・・・・・潤滑剤。The figure is a cross-sectional view of a magnetic recording medium according to an embodiment of the present invention. 1...Glass substrate, 2.Old...Magnetic metal thin film,
3...Adsorption layer, 4...Lubricant.

Claims (1)

【特許請求の範囲】 １、磁気記録面上にパーフルオロアルキルカルボン酸の
吸着層を設け、該層上にフルオロカーボン系の潤滑層を
設けたことを特徴とする磁気記録媒体。 ２、パーフルオロアルキルカルボン酸の吸着層を真空蒸
着法により磁気記録面上に設け、更に該層上にフルオロ
カーボン系の潤滑剤を塗布することを特徴とする磁気記
録媒体の製造方法。[Scope of Claims] 1. A magnetic recording medium characterized in that a perfluoroalkylcarboxylic acid adsorption layer is provided on a magnetic recording surface, and a fluorocarbon-based lubricating layer is provided on the layer. 2. A method for manufacturing a magnetic recording medium, which comprises providing an adsorption layer of perfluoroalkylcarboxylic acid on a magnetic recording surface by vacuum evaporation, and further coating the layer with a fluorocarbon lubricant.