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Ionic liquid, lubricant, and magnetic recording medium

一种离子液体、润滑剂的技术，应用在磁记录、磁记录层、数据记录等方向，能够解决耐久性恶化、热稳定性担心等问题，达到优异实用特性的效果

Inactive Publication Date: 2017-05-10
DEXERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a problem with this technology, it can be mentioned that the recording part is heated by laser light during recording and reproduction, so the lubricant on the surface of the magnetic layer evaporates or decomposes, causing deterioration of durability.
Heat-assisted magnetic recording may be exposed to high temperatures of over 400°C for a short period of time, and Z-DOL and ammonium carboxylate salt-based lubricants, which are generally used as lubricants for thin-film magnetic recording media, are of concern for their thermal stability.

Method used

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  • Ionic liquid, lubricant, and magnetic recording medium
  • Ionic liquid, lubricant, and magnetic recording medium
  • Ionic liquid, lubricant, and magnetic recording medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0174]

[0175] Nonafluorobutanesulfonic acid-1-octadecyl imidazolium salt was synthesized by the following scheme.

[0176] [chemical 10]

[0177]

[0178] 1-octadecylimidazole was synthesized by the following method.

[0179] 3 g of imidazole was dissolved in 100 mL of acetonitrile, 14.9 g of octadecane bromide and 2.51 g of potassium hydroxide were added, and the mixture was heated while stirring, and refluxed for 4 hours. After removing the solvent, it was extracted with dichloromethane and purified by column chromatography. Decomposition by gas chromatography showed a purity of 98.5% or more.

[0180] Next, 3.27 g of the synthesized 1-octadecylimidazole was dissolved in 50 mL of ethanol, 3.05 g of nonafluorobutanesulfonic acid was slowly added dropwise thereto, stirred for 30 minutes after the dropwise addition, and then heated to reflux for 1 hour. After removing the solvent, recrystallization was performed using a mixed solvent of ethanol / n-hexane to obtain colo...

Embodiment 2

[0193]

[0194] Hexafluorocyclopropanesulfonylimide-1-octadecylimidazolium salt was synthesized by the following scheme.

[0195] [chemical 13]

[0196]

[0197] 3.2 g of 1-octadecylimidazole synthesized in Example 1 was dissolved in ethanol, and a solution obtained by dissolving 2.93 g of hexafluorocyclopropanesulfonimide in ethanol was slowly added dropwise thereto. After the dropwise addition was completed, it was stirred for 30 minutes, and then heated to reflux for 1 hour. After removing the solvent, recrystallization was performed using a mixed solvent of ethanol / n-hexane to obtain 5.83 g of colorless hexafluorocyclopropanesulfonimide-1-octadecylimidazolium salt. The yield is 95%.

[0198] The assignment of the FTIR spectrum of the product is shown below.

[0199] 1098cm -1 can be seen at SO 2 The symmetrical stretching vibrations of , 1175 and 1223cm -1 CF can be seen at 2 The symmetrical stretching vibration of , 1351cm -1 can be seen at SO 2 Antisymmetri...

Embodiment 3

[0218] Using the lubricant containing nonafluorobutanesulfonate-1-octadecylimidazolium salt as the protic ionic liquid shown in Example 1, the aforementioned magnetic disk was produced. As shown in Table 5, the CSS measurement of the magnetic disk exceeded 50,000 times, and the CSS measurement after the heating test also exceeded 50,000 times, showing excellent durability.

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Abstract

The invention provides an ionic liquid, a lubricant, and a magnetic recording medium. The lubricant contains a protic ionic liquid having a conjugate acid (B+) and a conjugate base (X=), and the ionic liquid is represented by general formula (1) (as shown in the description). Here, in general formula (1), R1 and R2 are hydrogen atoms, or R1 and R2 form a benzene ring together with the carbon atom to which each is bonded, and R3 represents a straight-chain hydrocarbon group having at least 10 carbon atoms.

Description

technical field [0001] The present invention relates to a protic ionic liquid, a lubricant containing the ionic liquid, and a magnetic recording medium using the lubricant. Background technique [0002] Conventionally, for thin-film magnetic recording media, a lubricant is applied to the surface of the magnetic layer in order to reduce friction and wear between the magnetic head and the surface of the medium. In order to avoid adhesion such as stiction, the film thickness of the actual lubricant is at the molecular level. Therefore, it is not an exaggeration to say that the most important thing is to select a lubricant having excellent wear resistance under any environment in the case of a thin film magnetic recording medium. [0003] In terms of the service life of the magnetic recording medium, it is important that the lubricant exists on the surface of the medium without detachment, spin-off, chemical deterioration, or the like. The smoother the surface of the thin-film...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M159/12C10M105/70C10M105/72C10N30/06C10N30/08C10N40/18G11B5/725
CPCC10M159/12C10M105/70G11B5/725C10M2215/2265C07D233/58C07D285/16C10M105/72C07C309/06C10N2020/077C10N2030/02C10N2030/08C10N2030/06C10N2040/18C10N2050/02C10M2219/0406C10M2215/221C10M2219/044
Inventor 近藤洋文初田弘毅伊藤牧八多纳信郎尹炅成渡边正义
Owner DEXERIALS CORP