JPH0273514A - Magnetic disk medium - Google Patents
Magnetic disk mediumInfo
- Publication number
- JPH0273514A JPH0273514A JP22521888A JP22521888A JPH0273514A JP H0273514 A JPH0273514 A JP H0273514A JP 22521888 A JP22521888 A JP 22521888A JP 22521888 A JP22521888 A JP 22521888A JP H0273514 A JPH0273514 A JP H0273514A
- Authority
- JP
- Japan
- Prior art keywords
- perfluoropolyether
- magnetic disk
- medium
- disk medium
- 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.)
- Pending
Links
- 239000010702 perfluoropolyether Substances 0.000 claims abstract description 29
- 239000000314 lubricant Substances 0.000 claims abstract description 25
- 125000000524 functional group Chemical group 0.000 claims abstract description 11
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 11
- 239000000126 substance Substances 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 125000000876 trifluoromethoxy group Chemical group FC(F)(F)O* 0.000 claims abstract 2
- 230000007774 longterm Effects 0.000 abstract 1
- 238000004528 spin coating Methods 0.000 abstract 1
- 239000010408 film Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004833 X-ray photoelectron spectroscopy Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 150000002222 fluorine compounds Chemical class 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
- Lubricants (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、情報の記録再生を行なうための磁性層を表面
に有している磁気記録媒体、特に磁性層表面と磁気ヘッ
ドとが接触摺動する磁気ディスク媒体に関する。Detailed Description of the Invention [Industrial Field of Application] The present invention relates to a magnetic recording medium having a magnetic layer on the surface for recording and reproducing information, particularly a magnetic recording medium in which the surface of the magnetic layer and a magnetic head are in contact with each other. The present invention relates to a moving magnetic disk medium.
固定磁気ディスク装置に使用されている磁気ディスク媒
体（以下、媒体という）は、磁気ヘッドと接触しなから
摺動運動を行なうため、基板の上に塗布法、メツキ法、
スパッタ法等で形成した磁性体層に磨耗が生じる。The magnetic disk medium (hereinafter referred to as the medium) used in fixed magnetic disk devices performs sliding motion without contacting the magnetic head, so it is coated on the substrate by coating, plating, etc.
Abrasion occurs in the magnetic layer formed by sputtering or the like.
これを防止するため、磁性体層の上に潤滑剤の薄膜の層
を形成しておく必要がある。この潤滑剤として、従来は
、パーフロロポリエーテル等の高分子弗素化合物が使用
され、スプレー法、スピンコード法、ディッピング法等
によって媒体表面に塗布されている。To prevent this, it is necessary to form a thin film of lubricant on the magnetic layer. Conventionally, a polymeric fluorine compound such as perfluoropolyether is used as this lubricant, and is applied to the surface of the medium by a spray method, a spin code method, a dipping method, or the like.
上述した従来の媒体に使用されている潤滑剤であるパー
フロロポリエーテル、例えば化学式％式％
で表され、平均分子量が、８０００〜＋５０００である
ＦＯＭＢＬＩＮ Ｚ（イタリアのモンテフルオス社か
ら市販されている商品名）は、高分子量であるにもかか
わらず、媒体の潤滑剤として適当な動粘度（１５０〜２
５０ｃｓｔ）を有しており、非常に優れた媒体用の潤滑
剤として広く使われている。Perfluoropolyether is a lubricant used in the conventional media mentioned above, such as FOMBLIN Z (commercially available from Montefluos, Italy), which is expressed by the chemical formula % and has an average molecular weight of 8000 to +5000. Although it has a high molecular weight, it has a kinematic viscosity (150 to 2
50cst) and is widely used as an excellent media lubricant.
しかしながら、この潤滑剤を使用した媒体は、潤滑剤を
付与した直後の耐磨耗性は非常に優れているものの、デ
ィスク装置内で、媒体が高速回転（−数的には、３６０
０ｒｐｍ ）で長時間稼働すると、この潤滑剤は、媒体
表面との結合力を持たないので、媒体表面の潤滑膜は、
遠心力により媒体の外周側に移動し、遂には最外周端か
ら飛散してしまつ。However, although media using this lubricant have very good wear resistance immediately after the lubricant is applied, the media rotates at high speed (-360
When operated for a long time at 0 rpm), this lubricant has no bonding force with the media surface, so the lubricant film on the media surface is
Due to centrifugal force, it moves toward the outer circumference of the medium, and eventually scatters from the outermost edge.
したがって、従来の媒体では、媒体表面の潤滑膜が高速
回転下での時間経過とともに、その膜厚が徐々に減少し
ていき、それにともなって、媒体の耐磨耗性が劣化して
いく。Therefore, in conventional media, the thickness of the lubricating film on the surface of the medium gradually decreases over time under high-speed rotation, and the wear resistance of the medium deteriorates accordingly.
本発明によれば、磁気ディスク媒体表面に付与する潤滑
剤が、末端基に水酸基を有する第一のパーフロロポリエ
ーテルと、官能基を有さない第二のパーフロロポリエー
テルとの混合体であることを特徴とする磁気ディスク媒
体が得られる。According to the present invention, the lubricant applied to the surface of the magnetic disk medium is a mixture of the first perfluoropolyether having a hydroxyl group at the terminal group and the second perfluoropolyether having no functional group. A magnetic disk medium is obtained which is characterized in that:
ｌニヘ支１匠
本発明による磁気ディスク媒体においては、末端基に水
酸基を有する第一のパーフロロポリエーテルと官能基を
有さない第二のパーフロロポリエーテルとの混合体が、
潤滑剤として使用される。In the magnetic disk medium according to the present invention, a mixture of a first perfluoropolyether having a hydroxyl group at the end group and a second perfluoropolyether having no functional group is
Used as a lubricant.
第一の実施例による５、２５”径の塗布型磁気ディスク
媒体においては、第一のパーフロロポリエーテルとして
、化学式
％式％）
で示され、平均分子量が２０００〜４０００であるＦＯ
ＭＢＬＴＮ Ｚ Ｄｏｌ（イタリアのモンテフルオ
ス社から市販されている商品名）が使用される。In the coated magnetic disk medium with a diameter of 5 and 25 inches according to the first embodiment, the first perfluoropolyether is FO having the chemical formula (%) and an average molecular weight of 2000 to 4000.
MBLTN Z Dol (trade name, commercially available from Montefluos, Italy) is used.
また、第二のパーフロロポリエーテルとして、化学式
％式％
で表され、平均分子量が、８０００〜１５０００である
前述のＦＯＭＢＬＩＮ Ｚが使用される。第一のパー
フロロポリエーテルが２．０ｗｔ％となるような混合比
とし、膜厚が５０人になるようにスピンコード法にて磁
気ディスク表面に塗布される。Further, as the second perfluoropolyether, the aforementioned FOMBLIN Z, which is represented by the chemical formula % and has an average molecular weight of 8,000 to 15,000, is used. The mixture ratio is such that the first perfluoropolyether is 2.0 wt %, and the coating is applied to the surface of the magnetic disk using a spin code method so that the film thickness is 50%.
１ニへ炙り漣
第二の実施例による５、２５″径の塗布型磁気ディスク
媒体において使用する第一および第二のパーフロロポリ
エーテルは、第一の実施例の場合と同じであるが、混合
比を第一のパーフロロポリエーテルが１０．０ｗｔ％と
なるようにし、膜厚が第一の実施例と同様に５０人にな
るようにスピンコード法にて塗布される。The first and second perfluoropolyethers used in the coated magnetic disk medium with a diameter of 5 and 25 inches according to the second embodiment are the same as those in the first embodiment, but The mixing ratio of the first perfluoropolyether was set to 10.0 wt %, and the coating was applied using a spin code method so that the film thickness was 50% as in the first example.
第１図および第２図は、第一および第二の実施例と従来
例との比較結果を示す。なお、この比較において使用し
た従来例は、潤滑剤として官能基を有さないパーフロロ
ポリエーテルである前述のＦＯＭＢＬＩＮ Ｚを単品
で使用し、これを膜厚５０人によるようにスピンコード
法で塗布した５、２５″径の塗布型磁気ディスク媒体で
ある。FIGS. 1 and 2 show comparison results between the first and second embodiments and the conventional example. In the conventional example used in this comparison, the above-mentioned FOMBLIN Z, which is a perfluoropolyether without functional groups, was used as a lubricant alone, and this was applied to a film thickness of 50 using the spin code method. This is a coated magnetic disk medium with a diameter of 5.25''.
第１図は耐磨耗性評価をＣＳＳ ＜コンタクト・スター
ト・ストップ）試験によって行なった結果を示し、第２
図は潤滑膜厚をＥＳＣＡ （島津ＥＳＣＡ７５０）を用
いて測定した結果を示す。Figure 1 shows the results of wear resistance evaluation conducted by CSS (Contact Start Stop) test.
The figure shows the results of measuring the lubricant film thickness using ESCA (Shimadzu ESCA750).
また、Ｃ８Ｓ試験および潤滑膜厚ともに、初期値と高速
回転で長時間経過後の結果を示しであるが、高速回転に
よる潤滑剤の飛散を加速するため、回転数７２０Ｏｒｐ
ｍ 、雰囲気温度１２０℃として評価した。第１図に示
したＣ８Ｓ試験は、荷重が９．５ｇであるワトラスジン
バル型のＭｎ−Ｚｎフェライトヘッドを用いて、第３図
に示すサイクルで試験したものである。In addition, both the C8S test and the lubricant film thickness show the initial values and the results after a long period of time at high speed rotation, but in order to accelerate the scattering of lubricant due to high speed rotation,
m, and the ambient temperature was 120°C. The C8S test shown in FIG. 1 was conducted using a Watrous gimbal type Mn--Zn ferrite head with a load of 9.5 g and the cycle shown in FIG. 3.
第１図に示すように、第一および第二の実施例は、媒体
の高速回転での長時間経過後のＣ８Ｓ回数も初期値と大
差なく、従来例と比べると長時間経過後の耐磨耗性が非
常に優れていることがわかる。これは、実施例の媒体は
その潤滑剤に官能基として水酸基を有するパーフロロポ
リエーテルを含有しているので、水酸基と媒体表面とが
強固に結合し、媒体の高速回転によっても潤滑剤の飛散
が小さくなるからである。このことは、第２図に示す高
速回転時間による潤滑膜厚の減少が従来例に比べて小さ
いことかられかる。As shown in FIG. 1, in the first and second embodiments, the number of C8S after a long time with high-speed rotation of the medium is not much different from the initial value, and compared to the conventional example, the wear resistance after a long time has increased. It can be seen that the wear resistance is very good. This is because the lubricant of the medium of the example contains perfluoropolyether having a hydroxyl group as a functional group, so the hydroxyl group and the surface of the medium are strongly bonded, and even when the medium rotates at high speed, the lubricant scatters. This is because it becomes smaller. This can be seen from the fact that the decrease in the lubricant film thickness due to the high-speed rotation time shown in FIG. 2 is smaller than in the conventional example.
水酸基を有するパーフロロポリエーテルとして使用する
ＦＯＭＢＬＩＮ Ｚ Ｄｏｔの平均分子量は、２０
００〜４０００であり、官能基を有さないパーフロロポ
リエーテルの平均分子量（８０００〜！５０００）と比
べると小さく、単品での耐磨耗性は官能基を有さないパ
ーフロロポリエーテルよりも劣る。したがって、潤滑剤
に占める水酸基を有するパーフロロポリエーテルの比率
が高くなるにしたがって、初期の耐磨耗性は劣化してく
るので、混合比率は、水酸基を有するパーフロロポリエ
ーテルが５０ｗｔ％以下でないと効果はない。The average molecular weight of FOMBLIN Z Dot used as perfluoropolyether having a hydroxyl group is 20
00 to 4,000, which is lower than the average molecular weight of perfluoropolyethers that do not have functional groups (8,000 to !5,000), and the abrasion resistance of the single product is higher than that of perfluoropolyethers that do not have functional groups. Inferior. Therefore, as the proportion of perfluoropolyether having hydroxyl groups in the lubricant increases, the initial wear resistance deteriorates, so the mixing ratio should not exceed 50 wt% of perfluoropolyether having hydroxyl groups. And there is no effect.
以上説明したように、本発明によれば、媒体の潤滑剤を
官能基を有さないパーフロロポリエーテルと官能基とし
て水酸基を有するパーフロロポリエーテルとの混合体と
することにより、媒体の高速回転による潤滑剤の飛散を
防止し、長期に渡り媒体の耐磨耗性を保証でき、高信頼
性の磁気ディスク媒体を得ることができる。As explained above, according to the present invention, the lubricant for the medium is a mixture of perfluoropolyether having no functional group and perfluoropolyether having a hydroxyl group as a functional group. It is possible to prevent lubricant from scattering due to rotation, ensure the wear resistance of the medium over a long period of time, and obtain a highly reliable magnetic disk medium.
第１図および第２図は１本発明の実施例と従来例とでの
高速回転時間による耐磨耗性の変化および潤滑膜厚の変
化をそれぞれ比較した図、第３図は第１図に示した耐磨
耗性を評価するＣ８Ｓ試験のＣ８Ｓサイクルを示す図で
ある。
代理人 弁理士 内 原 晋
Ｃ３Ｓ口数
浬湧順厚Figures 1 and 2 are diagrams comparing the changes in wear resistance and lubricant film thickness due to high-speed rotation time between the embodiment of the present invention and the conventional example, respectively, and Figure 3 is the same as Figure 1. It is a figure which shows the C8S cycle of the C8S test which evaluates the shown abrasion resistance. Agent: Susumu Uchihara, C3S, Junatsu Kuchi, patent attorney
Claims (3)
基に水酸基を有する第一のパーフロロポリエーテルと、
官能基を有さない第二のパーフロロポリエーテルとの混
合体であることを特徴とする磁気ディスク媒体。(1) The lubricant applied to the surface of the magnetic disk medium is a first perfluoropolyether having a hydroxyl group at the terminal group;
A magnetic disk medium characterized in that it is a mixture with a second perfluoropolyether having no functional group.
−ＣＦ２−（Ｏ−Ｃ２Ｆ４）ｐ−（Ｏ−ＣＦ２）＿ｑ−
ＯＣＦ２−ＣＨ２０Ｈで表される物質であり、前記第二
のパーフロロポリエーテルが化学式 Ｆ−ＣＦ２−（Ｏ−Ｃ２Ｆ４）ｐ−（Ｏ−ＣＦ２）ｑ−
ＯＣＦ２−ＯＣＦ３で表される物質であることを特徴と
する請求項（１）記載の磁気ディスク媒体。(2) The first perfluoropolyether has the chemical formula HO
-CF2-(O-C2F4)p-(O-CF2)_q-
It is a substance represented by OCF2-CH20H, and the second perfluoropolyether has the chemical formula F-CF2-(O-C2F4)p-(O-CF2)q-
2. The magnetic disk medium according to claim 1, wherein the magnetic disk medium is a substance represented by OCF2-OCF3.
０．１〜５０．０ｗｔ％の範囲であることを特徴とする
請求項（２）記載の磁気ディスク媒体。(3) The magnetic disk medium according to claim (2), wherein the weight concentration of the first perfluoropolyether is in the range of 0.1 to 50.0 wt%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22521888A JPH0273514A (en) | 1988-09-07 | 1988-09-07 | Magnetic disk medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22521888A JPH0273514A (en) | 1988-09-07 | 1988-09-07 | Magnetic disk medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0273514A true JPH0273514A (en) | 1990-03-13 |
Family
ID=16825839
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22521888A Pending JPH0273514A (en) | 1988-09-07 | 1988-09-07 | Magnetic disk medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0273514A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5776577A (en) * | 1993-07-29 | 1998-07-07 | Nec Corporation | Magnetic recording disk having a lubicant reservoir on the inner circumferential surface |
| US7510999B2 (en) | 2004-05-28 | 2009-03-31 | Hitachi Global Storage Technologies Netherlands B.V. | Lubricant composition for magnetic recording media |
-
1988
- 1988-09-07 JP JP22521888A patent/JPH0273514A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5776577A (en) * | 1993-07-29 | 1998-07-07 | Nec Corporation | Magnetic recording disk having a lubicant reservoir on the inner circumferential surface |
| US7510999B2 (en) | 2004-05-28 | 2009-03-31 | Hitachi Global Storage Technologies Netherlands B.V. | Lubricant composition for magnetic recording media |
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