WO2007105437A1 - Agent lubrifiant pour support d'enregistrement et disque magnetique - Google Patents

Agent lubrifiant pour support d'enregistrement et disque magnetique Download PDF

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Publication number
WO2007105437A1
WO2007105437A1 PCT/JP2007/053188 JP2007053188W WO2007105437A1 WO 2007105437 A1 WO2007105437 A1 WO 2007105437A1 JP 2007053188 W JP2007053188 W JP 2007053188W WO 2007105437 A1 WO2007105437 A1 WO 2007105437A1
Authority
WO
WIPO (PCT)
Prior art keywords
lubricant
magnetic disk
recording medium
lubricating agent
recording
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.)
Ceased
Application number
PCT/JP2007/053188
Other languages
English (en)
Japanese (ja)
Inventor
Akinobu Wakabayashi
Yasuo Sakane
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Matsumura Oil Research Corp
Original Assignee
Matsumura Oil Research Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsumura Oil Research Corp filed Critical Matsumura Oil Research Corp
Publication of WO2007105437A1 publication Critical patent/WO2007105437A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M107/00—Lubricating compositions characterised by the base-material being a macromolecular compound
    • C10M107/38—Lubricating compositions characterised by the base-material being a macromolecular compound containing halogen
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M107/00—Lubricating compositions characterised by the base-material being a macromolecular compound
    • C10M107/48—Lubricating compositions characterised by the base-material being a macromolecular compound containing phosphorus
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/72—Protective coatings, e.g. anti-static or antifriction
    • G11B5/725—Protective coatings, e.g. anti-static or antifriction containing a lubricant, e.g. organic compounds
    • G11B5/7253—Fluorocarbon lubricant
    • G11B5/7257—Perfluoropolyether lubricant
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2213/00—Organic macromolecular compounds containing halogen as ingredients in lubricant compositions
    • C10M2213/06—Perfluoro polymers
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
    • C10M2223/08—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having phosphorus-to-nitrogen bonds
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/14—Electric or magnetic purposes
    • C10N2040/18—Electric or magnetic purposes in connection with recordings on magnetic tape or disc

Definitions

  • the present invention relates to a lubricant for a recording medium such as a magnetic disk and a magnetic tape, and a magnetic disk in which a lubricant layer is formed using the lubricant.
  • Perfluoropolyether compounds are generally used as lubricants for magnetic disks, and in particular, Fomblin compounds made of solbaine having low surface energy and low frictional force. Has become the mainstream. Fomblin compounds are perfluoropolyether compounds having a basic skeleton force S (CF CF 3 O) (CF 2 O) of the main chain.
  • the drive system of the magnetic disk drive has a contact 'start' stop (CSS) system in which the head and the disk come into contact with each other when the device starts and stops.
  • SCS contact 'start' stop
  • LZUL ramp 'load' unload
  • Such lubricants widely used include fomblin perfluoropolyether compounds having a plurality of polar groups in the molecule (for example, “fomblin Z-Tetraol ”), but this lubricant has not solved the problem of decomposition by alumina.
  • the end of the fomblin perfluoropolyether skeleton is used as a compound that suppresses the decomposition reaction by alumina despite having a fomblin perfluoropolyether chain in the molecule.
  • Compounds with modified phosphazene functional groups are known
  • UV treatment has been employed to firmly adhere the lubricant applied to the magnetic disk, but in recent years, UV (ultraviolet) treatment has begun to be studied. Since UV treatment has the advantage that there is no problem such as deterioration of the magnetic layer due to heat treatment that takes less time than heat treatment, future development is expected. However, conventional lubricants did not show excellent adhesion by UV treatment.
  • An object of the present invention is to provide a lubricant for a recording medium that adheres firmly to the recording medium by UV treatment and is not easily decomposed.
  • the present invention provides a lubricant for a recording medium and a magnetic disk as described below. [0011] 1. Formula (1);
  • the perfluoropolyether compound contained in the recording medium lubricant of the present invention has the formula (1);
  • This perfluoropolyether compound has a property of strongly adhering to a substrate disk by UV treatment.
  • the fluoralkyl group is more preferably a trifluoromethyl group, preferably a perfluoroalkyl group. As m, 10-25 are preferable.
  • the recording medium lubricant of the present invention is produced, for example, as follows.
  • m-trifluoromethylphenol, cyclophosphazene, metallic sodium and general-purpose solution Mix the medium (eg, diisopropyl ether) and stir at 70 ° C. for 48 hours. After completion of the reaction, the mixture is extracted with a solvent, and the solvent of the extract is distilled off to obtain a viscous liquid (pentatrifluoromethylphenoxyphosphazene). Then F (CF CF CF O) -CF CF C
  • “Demnum SA” manufactured by Daikin Industries, Ltd. may be mentioned.
  • the m of this perfluoropolyether compound is preferably 10-25.
  • Number average molecular weight ⁇ It is about 500-10000, and it is about 2000-4000.
  • the use of the recording medium lubricant of the present invention includes use as a lubricant for improving the sliding characteristics of a magnetic disk in a magnetic disk device.
  • the purpose of this is to reduce the coefficient of friction between the magnetic disk and the head, and therefore, as a lubricant in other recording devices in which sliding occurs between the recording medium such as magnetic tape and the head in addition to the magnetic disk.
  • it can be used as a surface coating agent for a magnetic head.
  • it may be used as a lubricant for equipment having a sliding part.
  • the lubricant of the present invention exhibits excellent adhesion to the protective layer of the substrate disk by UV treatment, a carbon protective film used as the protective layer, Si N, SiC
  • the lubricant of the present invention also exhibits the effect of suppressing the decomposition of the fomblin perfluoropolyether compound, and therefore can be used in combination with the fomblin lubricant. It can also be used in combination with non-fomblin lubricants (for example, “Demnam SA” manufactured by Daikin Industries, Ltd., “Crite Tutus 157FS” manufactured by DuPont, etc.).
  • non-fomblin lubricants for example, “Demnam SA” manufactured by Daikin Industries, Ltd., “Crite Tutus 157FS” manufactured by DuPont, etc.
  • FIG. 1 shows an outline of the configuration (cross section) of an example of the magnetic disk of the present invention.
  • the magnetic disk of the present invention has a recording layer 2 on a support 1, a protective layer 3 on the recording layer 2, and a lubricant for the above-described lubricant for the recording medium.
  • Layer 4 is the outermost layer.
  • Examples of the material of the support 1 include aluminum alloy, glass, and polycarbonate.
  • Examples of the material of the recording layer 2 include alloys in which chromium, platinum, tantalum and the like are included in an element capable of forming a ferromagnetic material such as iron, cobalt, and nickel, or oxides thereof. These are formed by a plating method, a sputtering method or the like.
  • Examples of the material for the protective layer 3 include diamond-like carbon, SiN, SiC, and SiO. These include sputtering, CVD, etc.
  • the lubricating layer 4 is usually formed by a dipping method using the recording medium lubricant of the present invention dissolved in a solvent and using this solution.
  • a solvent capable of dissolving the recording medium lubricant of the present invention is used.
  • fluorocarbon solvents for example, “PF-5060”, “PF-5080”, “HFE-7100”, “HFE-7200” manufactured by Sumitomo 3EM, “Bertrel XF” manufactured by DuPont
  • UV treatment is performed. This UV treatment is performed by irradiating ultraviolet light having a wavelength of around 185 nm.
  • the recording medium lubricant of the present invention contains a perfluoropolyether compound in which a fluoralkylphenoxyphosphazene functional group is introduced at one end of a demnam perfluoropolyether chain. Since this phosphazene functional group functions as a Lewis base, it has excellent decomposition resistance. In addition, since the terminal fluoroalkylphenoxyphosphazene functional group of the perfluoropolyether compound adheres strongly to the recording medium by UV treatment, scattering is reduced.
  • a magnetic disk having a lubricating layer formed using the recording medium lubricant of the present invention can withstand continuous sliding under high-speed rotation, and a magnetic disk drive equipped with the magnetic disk can perform at high speed. Recording Z playback becomes possible.
  • FIG. 1 is a schematic cross-sectional view showing an example of a magnetic disk of the present invention.
  • FIG. 2 is a diagram showing the lubrication characteristics of a magnetic disk.
  • the resulting viscous liquid was subjected to 19 F-NMR analysis, and the number average molecular weight was calculated.
  • the number average molecular weight was 3488.
  • Example 1 The viscous liquid (lubricant) obtained in Example 1 was subjected to a decomposition resistance test for alumina, an adhesion test by UV treatment, and an adhesion test by heat treatment.
  • the perfluoropolyether compound “A20H-2000” manufactured by Matsumura Oil Research Co., Ltd. and “Z-Tetraol-2000S” manufactured by Solvaine Soil was analyzed in the same manner. Decomposition resistance test for Mina, adhesion test by UV treatment and adhesion test by heat treatment were conducted.
  • alumina powder was used in each of the viscous liquid (lubricant) obtained in Example 1 and “A2 OH-2000” manufactured by Matsumura Oil Research Co., Ltd. and “Z-Tetraol- 2000S” manufactured by Solvaine Soil.
  • alumina powder was used. (Average particle size 100 m) was added to 20% by weight and mixed for 1 minute or more using a shaker. About the sample mixed uniformly, the decomposition resistance test by heating was implemented using the thermal analyzer (TG ZDTA). The test consists of a sample mixed with alumina and a sample not mixed The sample was weighed into an aluminum container and heated at a temperature of 250 ° C in a nitrogen atmosphere, and the weight loss rate of the sample was measured. The results are shown in Table 1.
  • the viscous liquid (lubricant) obtained in Example 1 has a low weight reduction rate and there is almost no difference in the weight reduction rate due to the presence or absence of alumina. It was confirmed that it was excellent in decomposition resistance against alumina.
  • Example 1 The viscous liquid (lubricant) obtained in Example 1, and “A2 011—2000” manufactured by Matsumura Oil Research Co., Ltd. “2-—61 61 ⁇ & 01—20003” manufactured by Chobi Solvay Co., Ltd. each of, dissolved in DuPont "Vertrel XF" were prepared each lubricant solution (0.1 wt 0/0). A 3.5-inch diameter magnetic disk was immersed in a lubricant solution, pulled up at a speed of 4 mmZs and coated with a lubricant, and then irradiated with ultraviolet light having wavelengths of 185 nm and 254 nm for 1 minute.
  • this disc was immersed in “Bertrel XF” for 1 minute and pulled up at a speed of lOmmZs to wash away the non-adhering lubricant.
  • the film thickness of the lubricant deposited on the disk was measured by FTIR-RAS (High Sensitivity Reflective Fourier Transform Infrared Spectroscopy). The results are shown in Table 2.
  • the viscous liquid (lubricant) obtained in Example 1 was dissolved in “Bertrel XF” manufactured by DuPont to prepare a lubricant solution (0.1 wt%). After immersing a 3.5-inch diameter magnetic disk consisting of a support, recording layer and protective layer in a lubricant solution for 1 minute, pulling it up at a speed of 4 mmZs and applying the lubricant, ultraviolet light including wavelengths 185 nm and 254 nm is applied. Irradiated for 1 minute. The film thickness of the lubricant deposited on the disk was measured with FTIR-RAS. Lubricant film thickness was 24.8A.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Lubricants (AREA)
  • Magnetic Record Carriers (AREA)

Abstract

L'invention concerne un agent lubrifiant pour support d'enregistrement qui se décompose à peine et adhère fermement à un support d'enregistrement par traitement UV. L'invention concerne également un disque magnétique capable de supporter un glissement continu à des vitesses de rotation élevées. L'invention concerne notamment un agent lubrifiant pour supports d'enregistrement contenant un composé perfluoropolyéther représenté par la formule (1) suivante. F(CF2CF2CF2O)m-CF2CF2CH2-R1 (1) [Dans la formule, R1 représente un groupement représenté par : [Formule chimique 1] (dans laquelle R représente un groupement fluoroalkyle en C1-4) ; et m représente un nombre compris entre 2 et 60.] L'invention concerne également un disque magnétique muni d'une couche de lubrification composée d'un tel agent lubrifiant.
PCT/JP2007/053188 2006-02-28 2007-02-21 Agent lubrifiant pour support d'enregistrement et disque magnetique Ceased WO2007105437A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006-053478 2006-02-28
JP2006053478 2006-02-28

Publications (1)

Publication Number Publication Date
WO2007105437A1 true WO2007105437A1 (fr) 2007-09-20

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ID=38509273

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2007/053188 Ceased WO2007105437A1 (fr) 2006-02-28 2007-02-21 Agent lubrifiant pour support d'enregistrement et disque magnetique

Country Status (1)

Country Link
WO (1) WO2007105437A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8663822B2 (en) 2011-10-04 2014-03-04 HGST Netherlands B.V. Lubricant layer that provides a stable head-to-disk interface in humid conditions
JP5975368B2 (ja) * 2013-12-09 2016-08-23 株式会社Moresco フルオロポリエーテル化合物、およびこれを用いた潤滑剤ならびに磁気ディスク
WO2021085356A1 (fr) * 2019-11-01 2021-05-06 株式会社Moresco Composé phosphazène, lubrifiant et élément de contact de connecteur

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000260017A (ja) * 1999-01-07 2000-09-22 Fuji Electric Co Ltd 磁気記録媒体および該磁気記録媒体の製造方法
JP2001187796A (ja) * 1999-12-28 2001-07-10 Hitachi Ltd 含フッ素化合物、及び磁気ディスク、磁気ディスク装置
JP2002293787A (ja) * 2001-03-01 2002-10-09 Matsumura Sekiyu Kenkyusho:Kk ホスファゼン化合物

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000260017A (ja) * 1999-01-07 2000-09-22 Fuji Electric Co Ltd 磁気記録媒体および該磁気記録媒体の製造方法
JP2001187796A (ja) * 1999-12-28 2001-07-10 Hitachi Ltd 含フッ素化合物、及び磁気ディスク、磁気ディスク装置
JP2002293787A (ja) * 2001-03-01 2002-10-09 Matsumura Sekiyu Kenkyusho:Kk ホスファゼン化合物

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8663822B2 (en) 2011-10-04 2014-03-04 HGST Netherlands B.V. Lubricant layer that provides a stable head-to-disk interface in humid conditions
JP5975368B2 (ja) * 2013-12-09 2016-08-23 株式会社Moresco フルオロポリエーテル化合物、およびこれを用いた潤滑剤ならびに磁気ディスク
WO2021085356A1 (fr) * 2019-11-01 2021-05-06 株式会社Moresco Composé phosphazène, lubrifiant et élément de contact de connecteur
JPWO2021085356A1 (fr) * 2019-11-01 2021-05-06
JP7410965B2 (ja) 2019-11-01 2024-01-10 株式会社Moresco ホスファゼン化合物、潤滑剤およびコネクタ接点部材

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