WO2015093237A1 - フルオロポリエーテル化合物、これを含有する潤滑剤ならびに磁気ディスク - Google Patents
フルオロポリエーテル化合物、これを含有する潤滑剤ならびに磁気ディスク Download PDFInfo
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- WO2015093237A1 WO2015093237A1 PCT/JP2014/081072 JP2014081072W WO2015093237A1 WO 2015093237 A1 WO2015093237 A1 WO 2015093237A1 JP 2014081072 W JP2014081072 W JP 2014081072W WO 2015093237 A1 WO2015093237 A1 WO 2015093237A1
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- magnetic disk
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- lubricant
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C43/00—Ethers; Compounds having groups, groups or groups
- C07C43/02—Ethers
- C07C43/20—Ethers having an ether-oxygen atom bound to a carbon atom of a six-membered aromatic ring
- C07C43/23—Ethers having an ether-oxygen atom bound to a carbon atom of a six-membered aromatic ring containing hydroxy or O-metal groups
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C43/00—Ethers; Compounds having groups, groups or groups
- C07C43/02—Ethers
- C07C43/03—Ethers having all ether-oxygen atoms bound to acyclic carbon atoms
- C07C43/04—Saturated ethers
- C07C43/13—Saturated ethers containing hydroxy or O-metal groups
- C07C43/137—Saturated ethers containing hydroxy or O-metal groups containing halogen
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C43/00—Ethers; Compounds having groups, groups or groups
- C07C43/02—Ethers
- C07C43/20—Ethers having an ether-oxygen atom bound to a carbon atom of a six-membered aromatic ring
- C07C43/225—Ethers having an ether-oxygen atom bound to a carbon atom of a six-membered aromatic ring containing halogen
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- 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
- C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
- C10M105/50—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing halogen
- C10M105/54—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing halogen containing carbon, hydrogen, halogen and oxygen
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- 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
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- 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
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- 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
- C10M2211/00—Organic non-macromolecular compounds containing halogen as ingredients in lubricant compositions
- C10M2211/04—Organic non-macromolecular compounds containing halogen as ingredients in lubricant compositions containing carbon, hydrogen, halogen, and oxygen
- C10M2211/042—Alcohols; Ethers; Aldehydes; Ketones
- C10M2211/0425—Alcohols; Ethers; Aldehydes; Ketones used as base material
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- 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
- C10M2213/04—Organic macromolecular compounds containing halogen as ingredients in lubricant compositions obtained from monomers containing carbon, hydrogen, halogen and oxygen
- C10M2213/043—Organic macromolecular compounds containing halogen as ingredients in lubricant compositions obtained from monomers containing carbon, hydrogen, halogen and oxygen used as base material
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- 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
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
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- 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 fluoropolyether compound having an aromatic group and a hydroxyl group, a lubricant containing the compound, and a magnetic disk using the same.
- a carbon protective film and a lubricant film are provided on the surface of the magnetic disk for the purpose of suppressing wear when contacting or sliding with the head and preventing contamination of the disk surface.
- the carbon protective film is generally formed by sputtering or CVD.
- the surface of the disk is protected by both the carbon protective film and the lubricant film located in the upper layer.
- the lubricating layer used on the outermost surface is required to have various characteristics such as long-term stability, chemical substance resistance, friction characteristics, and heat resistance characteristics.
- a fluoropolyether having a functional group such as a hydroxyl group or an amino group at the molecular end has been used as a lubricant for magnetic disks.
- the fluoropolyether lubricant is low in durability to Lewis acid, and the main chain is cut by alumina (Al 2 O 3 ) contained in the magnetic head member due to contact with the magnetic head or the like. As a result, the lubricant film cannot be maintained in a system involving contact or sliding between the magnetic head and the magnetic disk.
- Patent Documents 1 to 4 fluoropolyether lubricants having functional groups at the molecular ends and molecular chains have been proposed (for example, Patent Documents 1 to 4).
- Patent Document 1 describes that by using a lubricant having a hydroxyl group in the molecular chain in addition to the molecular end, the film thickness for one molecule is reduced even if the molecular weight is increased.
- Patent Document 2 a lubricant layer having a hydroxyl group at the molecular end and the center of the molecular chain and further containing an aromatic ring at the center of the molecular chain can be used to reduce the thickness of the lubricating layer with a high coverage. are listed.
- Patent Document 3 describes that heat resistance can be improved by using a compound having an aromatic ring at the molecular end and the center of the molecular chain.
- Patent Document 4 by using a lubricant having a hydroxyl group at the molecular end and a benzene ring at the center of the molecular chain, the film thickness per molecule is reduced to reduce the spacing between the head and the disk. It is described that it exhibits dynamic durability.
- Patent Documents 1 to 4 do not describe lubricants that reduce the film thickness per molecule to reduce the spacing between the magnetic head and the magnetic disk and that are not decomposed by alumina even when in contact with the magnetic head. .
- An object of the present invention is to provide a compound that can be hardly decomposed even when in contact with a magnetic head and can reduce the spacing between the magnetic head and the magnetic disk, a lubricant using the compound, and a magnetic disk.
- the present inventor can achieve the above-mentioned problems by using a compound in which the benzene ring is di- or tri-substituted with a specific fluoropolyether chain having a functional group such as a hydroxyl group at the molecular end. As a result, the present invention has been completed.
- the present invention relates to the following compounds, lubricants and magnetic disks.
- R is — (CF 2 ) p O (CF 2 O) x (CF 2 CF 2 O) y (CF 2 CF 2 CF 2 O) z (CF 2 CF 2 CF 2 CF 2 O) w (CF 2 ) p -where x and y are each a real number from 0 to 30. z is a real number from 0 to 30. w is a real number from 0 to 20. p is an integer from 1 to 3. .) A compound represented by 2. A lubricant containing a compound represented by the formula (1). 3. A magnetic disk having at least a recording layer and a protective layer formed on a support and having a lubricating layer on the surface thereof, wherein the lubricating layer contains a compound represented by the formula (1).
- the fluoropolyether compound having an aromatic group and a hydroxyl group of the present invention is a compound that can simultaneously solve the two problems of film thickness reduction and decomposition resistance per molecule.
- the magnetic disk using the compound of the present invention as a lubricant can reduce the spacing between the magnetic head and the magnetic disk, and has excellent durability even in contact sliding between the magnetic head and the magnetic disk.
- the fluoropolyether represented by the formula (1) of the present invention is a fluoropolyether compound having an aromatic group and a hydroxyl group.
- the compound of the present invention represented by the formula (1) includes, for example, a linear fluoropolyether (a) having a hydroxyl group at one end and an ester group, a siloxy group or an alkoxy group at the other end; It can be obtained by reacting benzene (b) having two or three halogenated alkoxy groups. Specifically, it is synthesized by the following method.
- the first step is a step of synthesizing a linear fluoropolyether (a) having a hydroxyl group at one end and having an ester group, a siloxy group or an alkoxy group at the other end.
- the linear fluoropolyether (c) having a hydroxyl group at both ends is reacted with the compound (d) which reacts with the hydroxyl group to form an ester group, a siloxy group or an alkoxy group.
- the reaction temperature is usually 10 to 60 ° C., preferably 20 to 40 ° C.
- the reaction time is usually 2 to 20 hours, preferably 10 to 15 hours.
- the amount of compound (d) used is preferably 0.5 to 1.5 equivalents relative to fluoropolyether (c). In carrying out this reaction, a reaction accelerator may be used.
- a linear fluoropolyether (a) having a hydroxyl group at one end and an ester group, a siloxy group or an alkoxy group at the other end.
- the reaction may be performed in a solvent.
- the solvent dimethylformaldehyde, 1,4-dioxane, dimethyl sulfoxide, dimethylacetamide and the like can be used.
- the reaction accelerator include imidazole, pyridine, sodium hydroxide and the like.
- fluoropolyether (c) having a hydroxyl group at both ends for example, a compound represented by HOCH 2 CF 2 CF 2 CF 2 O (CF 2 CF 2 CF 2 O) w CF 2 CF 2 CF 2 CH 2 OH (C-1), HOCH 2 CF 2 O (CF 2 O) x (CF 2 CF 2 O) y CF 2 CH 2 OH compound (c-2), HOCH 2 CF 2 CF 2 O (CF 2 A compound (c-3) represented by CF 2 CF 2 O) z CF 2 CF 2 CH 2 OH can be given.
- the number average molecular weight of these fluoropolyethers is usually 300 to 2000, preferably 400 to 1500, more preferably 500 to 800.
- the number average molecular weight is a value measured by 19 F-NMR using JNM-ECX400 manufactured by JEOL.
- NMR measurement the sample itself was used for measurement without diluting the sample into a solvent.
- the standard for chemical shift was substituted with a known peak that is part of the skeleton structure of the fluoropolyether.
- W is usually a real number of 0 to 20, preferably a real number of 0 to 10, and more preferably a real number of 0 to 5.
- x is usually a real number of 0 to 30, preferably a real number of 1 to 20, and more preferably a real number of 5 to 10.
- y is usually a real number of 0 to 30, preferably a real number of 1 to 20, and more preferably a real number of 5 to 10.
- z is usually a real number of 0 to 20, preferably a real number of 1 to 15, and more preferably a real number of 3 to 10.
- p is 3
- p of compound (c-2) is 1
- p of compound (c-3) is 2.
- the fluoropolyether (c) is a compound having a molecular weight distribution, and the molecular weight distribution (PD) represented by weight average molecular weight / number average molecular weight is usually 1.0 to 1.5, preferably 1.0. To 1.3, and more preferably 1.0 to 1.1.
- the molecular weight distribution was determined by using HPLC-8220GPC manufactured by Tosoh Corporation, a column manufactured by Polymer Laboratory (PLgel Mixed E), an HCFC-based chlorofluorocarbon as an eluent, and a non-functional fluoropolyether as a reference material. This is the characteristic value obtained.
- Examples of the compound that reacts with a hydroxyl group to form an ester group, a siloxy group, or an alkoxy group include acid anhydrides, silyl halides, alkyl halides, and the like.
- Examples of the acid anhydride include maleic anhydride, succinic anhydride, phthalic anhydride, R a OR b (R a and R b are the same or different, and CH 3 CO, PhCO, CH 3 SO 2 , PhSO 2 , CF 3 CH 2 CO, or CH 3 C 6 H 4 SO 2 , where Ph represents phenyl.)
- Specific examples of the compound represented by R a OR b include trifluoromethylacetic anhydride, benzoic anhydride, p-toluenesulfonic anhydride, trifluoromethanesulfonic anhydride, acetic anhydride, acetic benzoic anhydride, methane Examples thereof include sulfonic acid anhydrides and benzenesulfonic acid anhydrides.
- Examples of the silyl halide include (R c ) 3 SiY, R d (R e ) 2 SiY, R d R e R g SiY (R c represents alkyl having 1 to 4 carbon atoms or Ph, and R d represents 1 carbon atom.
- R c represents alkyl having 1 to 4 carbon atoms or Ph
- R d represents 1 carbon atom.
- R e represents alkyl having 1 to 2 carbons or Ph
- R g is a phenyl group A substituted alkyl having 1 to 4 carbon atoms
- Y represents a halogen such as chlorine, bromine, iodine, etc.).
- trimethylsilyl chloride triethylsilyl chloride, triisopropylsilyl chloride, t-butyldimethylsilyl chloride, t-butyldiphenylsilyl chloride, (3-cyanopropyl) dimethylchlorosilane, benzylchlorodimethylsilane, butyldimethylchlorosilane, chloro ( Decyl) dimethylsilane, chloro (dodecyl) dimethylsilane, chlorodimethyl (3-phenylpropyl) silane, chlorodimethylphenylsilane, chlorodimethylpropylsilane, chlorodimethylvinylsilane, diethylisopropylsilyl chloride, dimethyl-n-octylchlorosilane, dimethylethyl Silyl chloride, dimethylisopropylchlorosilane, dimethylocta
- alkyl halide examples include compounds represented by AY (A represents alkyl having 1 to 5 carbon atoms, and Y represents halogen such as chlorine, bromine and iodine).
- AY alkyl having 1 to 5 carbon atoms
- Y represents halogen such as chlorine, bromine and iodine.
- the second step is a step of synthesizing the compound of the present invention.
- n is an integer of 2 to 6
- i is an integer of 2 or 3
- Y represents a halogen such as chlorine, bromine, iodine, etc.
- n is preferably an integer of 2 to 4.
- Specific examples of the compound in which i is 3 in the formula (2) include 1,3,5-tri (bromopropoxy) benzene, 1,2,3-tri (bromopropoxy) benzene, 1,2,4-tri ( Bromopropoxy) benzene, 1,3,5-tri (bromoethoxy) benzene, 1,2,3-tri (bromoethoxy) benzene, 1,2,4-tri (bromoethoxy) benzene and the like.
- Specific examples of the compound in which i is 2 in the formula (2) include o-di (bromopropoxy) benzene, m-di (bromopropoxy) benzene, p-di (bromopropoxy) benzene, o-di (bromoethoxy) Examples thereof include benzene, m-di (bromoethoxy) benzene, p-di (bromoethoxy) benzene and the like.
- the reaction temperature is usually 50 to 100 ° C., preferably 70 to 90 ° C.
- the reaction time is usually 20 to 100 hours, preferably 50 to 80 hours.
- the compound (b) is preferably used in an amount of 0.2 to 1.0 equivalent relative to the compound (a).
- the catalyst is preferably used in an amount of 0.05 to 0.1 equivalents relative to compound (a), and the alkali metal is preferably used in an amount of 1.0 to 2.0 equivalents relative to compound (a).
- alkali compounds such as t-butoxy sodium, t-butoxy potassium, sodium hydride and the like can be used. Sodium, potassium, etc. can be used as the alkali metal.
- the reaction may be performed in a solvent.
- t-butanol, toluene, xylene and the like can be used. Thereafter, for example, washing and dehydration are performed. Thereafter, the protecting group (ester group, siloxy group or alkoxy group) remaining at one terminal of the fluoropolyether is deprotected by hydrolysis or the like.
- a deprotection accelerator such as tetrabutylammonium fluoride, potassium fluoride, or sodium fluoride may be used.
- X —O (CH 2 ) m OH, —OCH 2 CH (OH) CH 2 OH, —OCH 2 CH (OH) CH 2 O—C 6 H 5 , or —OCH 2 CH (OH) CH 2 O—
- the compound (1) of the present invention which is C 6 H 4 —OCH 3 can be produced, for example, as follows from the compound of X ⁇ —OH obtained by the above process.
- the reaction temperature is usually 50 to 100 ° C., preferably 70 to 90 ° C.
- the reaction time is usually 20 to 100 hours, preferably 50 to 80 hours.
- the reaction may be performed in a solvent.
- the compound of the present invention In order to apply the compound of the present invention to the magnetic disk surface, a method in which the compound is diluted with a solvent and applied is preferable.
- the solvent include 3M PF-5060, PF-5080, HFE-7100, HFE-7200, and DuPont Vertrel-XF.
- the concentration of the diluted compound is 1 wt% or less, preferably 0.001 to 0.1 wt%.
- the compound of the present invention can also be used in combination with Solvinis Solexis Fomblin Zdol, Ztetraol, Zdol TX, AM, Daikin Industries Demnum, Dupont Krytox, etc. it can.
- the compound of the present invention can be used as a lubricant for realizing low spacing between the magnetic disk and the head in the magnetic disk apparatus and further improving the sliding durability.
- the compound of the present invention interacts with polar sites present in the carbon protective film due to hydroxyl groups at the molecular ends, and also with carbon unsaturated bonds present in the carbon protective film due to aromatic groups in the molecular chain. It is characterized by forming an action.
- a magnetic head having a carbon protective film, a magneto-optical recording device, a magnetic tape, a surface protective film of an organic material such as plastic, and an inorganic material such as Si 3 N 4 , SiC, and SiO 2 It can also be used as a surface protective film for materials.
- FIG. 1 shows a schematic diagram of a cross section of a magnetic disk of the present invention.
- the magnetic disk of the present invention has at least one recording layer 2 on a support 1, a protective layer 3 thereon, and a lubricating layer 4 containing the compound of the present invention as an outermost layer. is there.
- the support include aluminum alloys, ceramics such as glass, polycarbonate, and the like.
- the constituent material of the magnetic layer that is the recording layer of the magnetic disk is mainly an element capable of forming a ferromagnetic material such as iron, cobalt, nickel, etc., and an alloy obtained by adding chromium, platinum, tantalum, etc. to this, or oxidation thereof. Things. These are formed by plating or sputtering. Examples of the material for the protective layer include carbon, SiC, and SiO 2 . These are formed by sputtering or CVD.
- the thickness of the lubricant layer currently in circulation is 30 mm or less, if a lubricant having a viscosity of about 100 mPa ⁇ s or more at 20 ° C. is applied as it is, the film thickness may be too large. Therefore, a solution dissolved in a solvent is used for coating. Whether the compound of the present invention is used alone as a lubricant or mixed with other lubricants, it is easier to control the required film thickness when dissolved in a solvent. However, the concentration varies depending on the application method, conditions, mixing ratio, and the like.
- the film thickness of the lubricant of the present invention is preferably 5 to 15 mm.
- the heat treatment temperature is usually 60 to 150 ° C., preferably 80 to 150 ° C.
- ultraviolet treatment it is preferable to use ultraviolet rays having wavelengths of 185 nm and 254 nm as main wavelengths.
- the magnetic disk of the present invention stores a disk and controls a magnetic disk drive equipped with a magnetic head for recording, reproducing or erasing information, a motor for rotating the magnetic disk, and the like. It can be applied to a magnetic disk device composed of a control system.
- an external memory such as an electronic computer or a word processor
- the present invention is also applicable to various devices such as navigation systems, games, mobile phones, PHS, building crime prevention, power plant management or control system internal / external recording devices, and the like.
- Compound 1 was a colorless transparent liquid, and the density at 20 ° C. was 1.68 g / cm 3 .
- the identification result of the compound 1 performed using NMR is shown.
- This compound (a2) (82 g) was dissolved in t-butanol (74 g), the compound (7 g) represented by the above formula (b1) and sodium hydride (3 g) were added, and the mixture was stirred at 70 ° C. for 4 days. did. Thereafter, the mixture was washed with water, mixed with 1M tetrahydrofuran solution (52 ml) of tetrabutylammonium fluoride, and then purified by column chromatography to obtain 27 g of Compound 2.
- Compound 2 was a colorless transparent liquid, and the density at 20 ° C. was 1.76 g / cm 3 .
- the identification result of the compound 2 performed using NMR is shown.
- Compound 3 was a colorless and transparent liquid, and the density at 20 ° C. was 1.77 g / cm 3 .
- the identification result of the compound 3 performed using NMR is shown.
- Fluoropolyether represented by dimethylformaldehyde (175 g), HOCH 2 CF 2 CF 2 O (CF 2 CF 2 CF 2 O) z CF 2 CF 2 CH 2 OH (z 7, number average molecular weight 1480) under an argon atmosphere , 350 g of molecular weight distribution 1.20), triisopropylsilyl chloride (45 g) and imidazole (18 g) were stirred at 30 ° C. for 12 hours. Thereafter, the mixture was washed with water and dehydrated, and purified by silica gel column chromatography to obtain 200 g of a compound (a3) having one hydroxyl group at one end and a triisopropylsilyl group at the other end. This compound (a3) (140 g) is dissolved in t-butanol (140 g) to obtain the formula (b2):
- Compound 4 was a colorless and transparent liquid, and the density at 20 ° C. was 1.71 g / cm 3 .
- the identification result of the compound 4 performed using NMR is shown.
- Compound 5 was a colorless and transparent liquid, and the density at 20 ° C. was 1.69 g / cm 3 .
- the identification result of the compound 5 performed using NMR is shown.
- R 1 represents the following formula (a):
- R 2 is —CF 2 CF 2 O (CF 2 CF 2 CF 2 O) z CF 2 CF 2 —.
- Test Example 1 Evaluation of decomposition resistance against aluminum oxide
- Samples for evaluation of degradation resistance were prepared by adding 20% by weight of Al 2 O 3 to each of the lubricants (compounds 1 to 6), shaking vigorously, and further mixing with ultrasonic waves. Evaluation of decomposition resistance was performed by measuring the weight reduction rate of the lubricant after heating at 250 ° C. for 100 minutes using a thermal analyzer (TG / TDA). The sample was 20 mg, and the measurement was performed in a nitrogen atmosphere. The obtained results are shown in Table 1.
- Test Example 2 Evaluation of lubricant retention characteristics on a disk under high-speed rotation
- Lubricants compounds 1, 2, 5 and 6
- the concentration of lubricant in this solution was 0.05% by weight.
- a 2.5 inch diameter magnetic disk was immersed in this solution for 1 minute and pulled up at a speed of 2 mm / s. Thereafter, the magnetic disk was irradiated with a low-pressure mercury lamp containing a wavelength of 185 nm for 20 seconds, and the average film thickness of the compound on the magnetic disk was measured by FT-IR. This film thickness is defined as h ⁇ .
- Test Example 3 Measurement of monomolecular film thickness
- the monomolecular film thickness (film thickness per molecule) of the lubricant applied on the magnetic disk is determined by the lubricant on the disk as described in JOURNAL of TRIBLOGY, OCTOBER 2004, VOL.126, PAGE751. This is confirmed by observing the diffusion behavior of sapphire with an ellipsometer.
- the monomolecular film thickness is obtained as the film thickness of the terrace portion of the lubricant film.
- compounds 1, 2, 3, 5 and 6 were each dissolved in Vertrel-XF manufactured by DuPont.
- the concentrations of compounds 1, 2, 3, 5 and 6 in this solution were all 0.1% by weight.
- a portion (about 1/4) of a 2.5-inch diameter magnetic disk is immersed in this solution and pulled up at a speed of 4 mm / s, whereby a portion where compound 1, 2, 3, 5 or 6 is applied as a lubricating layer And a disk made of a portion not coated.
- the average film thickness of the applied part was 32 mm.
- the fluoropolyether compound having an aromatic group and a hydroxyl group of the present invention is superior to the compound 6 in which a benzene ring and three fluoropolyether chains are linked by CH 2 , which is superior in alumina decomposition resistance. It has been confirmed that the film has good properties and lubricant retention characteristics and exhibits a low monomolecular film thickness.
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Abstract
Description
1.式(1):
C6H6-i-[O-(CH2)n-O-CH2―R-CH2-X]i (1)
(式中、nは2~6の整数であり、iは2または3の整数であり、Xは-OH、-O-(CH2)m-OH、-OCH2CH(OH)CH2OH、-OCH2CH(OH)CH2O-C6H5、または-OCH2CH(OH)CH2O-C6H4-OCH3で表される基である。mは1~6の整数である。Rは、-(CF2)pO(CF2O)x(CF2CF2O)y(CF2CF2CF2O)z(CF2CF2CF2CF2O)w(CF2)p-である。x及びyは、それぞれ0~30の実数である。zは0~30の実数である。wは0~20の実数である。pは1~3の整数である。)
で表される化合物。
2.式(1)で表される化合物を含有する潤滑剤。
3.支持体上に少なくとも記録層及び保護層を形成し、その表面に潤滑層を有する磁気ディスクにおいて、該潤滑層が式(1)で表される化合物を含有する磁気ディスク。
C6H6-i-[O-(CH2)n-Y]i (2)
(式中、nは2~6の整数であり、iは2または3の整数であり、Yは塩素、臭素、ヨウ素などのハロゲンを示す。)で表される2つまたは3つのハロゲン化アルコキシ基を有するベンゼン(b)とを、触媒又はアルカリ金属の存在下で反応させる。
C6H3-[O-(CH2)3-O-CH2―R-CH2-OH]3(化合物1)の合成
Rは-CF2CF2CF2O(CF2CF2CF2CF2O)wCF2CF2CF2-である。
で表される化合物(7g)と水素化ナトリウム(3g)を加えて、70℃で4日間攪拌した。その後、混合物を水で洗浄し、テトラブチルアンモニウムフルオリドの1Mテトラヒドロフラン溶液(52ml)を混合させた後、カラムクロマトグラフィーにより精製することにより、化合物1を20g得た。
δ=-83.5ppm
〔30F,-OCF 2 CF2CF2CF 2 O-、-OCF 2 CF2CF2CH2OH、(-OCF 2 CF2CF2CH2OCH2CH2CH2O)3-C6H3〕,
δ=-120.3ppm
〔6F,(-OCF2CF2CF 2CH2OCH2CH2CH2O)3-C6H3〕,〔6F,-OCF2CF2CF 2CH2OH〕,
δ=-123.1ppm
〔6F,-OCF2CF2CF 2CH2OH〕,
δ=-125.8ppm
〔18F,-OCF2CF 2 CF 2 CF2O-〕,
δ=-127.4ppm
〔12F,-OCF2CF 2 CF2CH2OH,(-OCF2CF 2 CF2CH2OCH2CH2CH2O)3-C6H3〕,
w=1.5
δ=1.9ppm
〔6H,(-OCF2CF2CF2CH2OCH2CH 2 CH2O)3-C6H3〕,δ=3.2~3.8ppm
〔27H,HOCH 2 CF2CF2CF2O-、(-OCF2CF2CF2CH 2 OCH 2 CH2CH 2 O)3-C6H3〕,
δ=6.1ppm
〔3H,(-OCF2CF2CF2CH2OCH2CH2CH2O)3-C6 H 3 〕
C6H3-[O-(CH2)3-O-CH2―R-CH2-OH]3(化合物2)の合成
Rは-CF2O(CF2O)x(CF2CF2O)yCF2-である。
δ=-52.1ppm、-53.7ppm、-55.4ppm
〔32F,-OCF 2O-〕,
δ=-78.0ppm、-80.0ppm
〔6F,(-OCF 2CH2OCH2CH2CH2O)3-C6H3〕,
δ=-81.0,-83.0ppm
〔6F,-CF 2CH2OH〕,
δ=-89.1ppm、-90.7ppm
〔67F,-OCF 2CF 2O-〕
x=5.4
y=5.6
δ=1.9ppm
〔6H,(-OCF2CH2OCH2CH 2 CH2O)3-C6H3〕,
δ=3.0~4.0ppm
〔27H,HOCH 2 CF2O-、(-OCF2CH 2 OCH 2 CH2CH 2 O)3-C6H3〕,
δ=6.1ppm
〔3H,(-OCF2CH2OCH2CH2CH2O)3-C6 H 3 〕
C6H3-[O-(CH2)3-O-CH2-R-CH2-OH]3(化合物3)の合成
Rは-CF2CF2O(CF2CF2CF2O)zCF2CF2-である。
〔88F,-OCF 2 CF2CF 2 O-〕
δ=-86.4ppm
〔12F,-OCF 2 CF2CH2OH,(-OCF 2 CF2CH2OCH2CH2CH2O)3-C6H3〕
δ=-124.3ppm
〔6F,(-OCF2CF 2 CH2OCH2CH2CH2O)3-C6H3〕
δ=-127.5ppm
〔6F,-OCF2CF 2CH2OH〕,
δ=-129.7ppm
〔44F,-OCF2CF 2 CF2O-〕
z=7.3
δ=1.9ppm
〔6H,(-OCF2CF2CH2OCH2CH 2 CH2O)3-C6H3〕,
δ=2.8~4.2ppm
〔27H,HOCH 2 CF2CF2O-、(-OCF2CF2CH 2 OCH 2 CH2CH 2 O)3-C6H3〕,
δ=6.1ppm
〔3H,(-OCF2CF2CH2OCH2CH2CH2O)3-C6 H 3 〕
C6H4-[O-(CH2)2-O-CH2-R-CH2-OH]2(化合物4)の合成
Rは-CF2CF2O(CF2CF2CF2O)zCF2CF2-である。
で表される化合物(10g)と水素化ナトリウム(3g)を加えて、70℃で4日間攪拌した。その後、混合物を水で洗浄し、テトラブチルアンモニウムフルオリドの1Mテトラヒドロフラン溶液(52ml)を混合させた後、カラムクロマトグラフィーにより精製することにより、化合物4を32g得た。
〔57F,-OCF 2 CF2CF 2 O-〕
δ=-86.4ppm
〔8F,-OCF 2 CF2CH2OH,(-OCF 2 CF2CH2OCH2CH2O)2-C6H4〕
δ=-124.3ppm
〔4F,(-OCF2CF 2 CH2OCH2CH2O)2-C6H4〕
δ=-127.5ppm
〔4F,-OCF2CF 2CH2OH〕,
δ=-129.7ppm
〔28F,-OCF2CF 2 CF2O-〕
z=7.1
δ=3.2~3.8ppm
〔18H,HOCH 2 CF2CF2O-、(-OCF2CF2CH 2 OCH 2 CH 2 O)2-C6H4〕,
δ=6.8ppm
〔4H,(-OCF2CF2CH2OCH2CH2O)2-C6 H 4 〕
C6H4-[O-(CH2)2-O-CH2-R-CH2-OCH2CH(OH)CH2OH]2(化合物5)の合成
Rは-CF2CF2O(CF2CF2CF2O)zCF2CF2-である。
〔55F,-OCF 2 CF2CF 2 O-〕
δ=-86.4ppm
〔8F,-OCF 2 CF2CH2OCH2CH(OH)CH2OH,(-OCF 2 CF2CH2OCH2CH2O)2-C6H4〕
δ=-124.3ppm
〔8F,-OCF2CF 2CH2OCH2CH(OH)CH2OH,(-OCF2CF 2 CH2OCH2CH2O)2-C6H4〕
δ=-129.7ppm
〔28F,-OCF2CF 2 CF2O-〕
z=6.9
δ=3.2~3.8ppm
〔26H,HOCH 2 CH(OH)CH 2 CF2CF2O-、(-OCF2CF2CH 2 OCH 2 CH 2 O)2-C6H4〕,
δ=6.8ppm
〔4H,(-OCF2CF2CH2OCH2CH2O)2-C6 H 4 〕
(HO-CH2-R2-CH2O-CH2)3-R1
ここでR1は下記式(a):
潤滑剤(化合物1~6)に、それぞれ20重量%のAl2O3を入れ、強く振とうしたのち超音波でさらに良く混合することにより、耐分解性評価用の試料を調製した。耐分解性の評価は、熱分析装置(TG/TDA)を用いて、250℃で100分間加熱した後の潤滑剤の重量減少率を測定することにより行った。試料は20mg、測定は窒素雰囲気下で行った。得られた結果を表1に示す。
潤滑剤(化合物1、2、5及び6)をDuPont製Vertrel-XFに溶解した。この溶液中の潤滑剤の濃度は0.05重量%であった。直径2.5インチの磁気ディスクをこの溶液に1分間浸漬し、速度2mm/sで引き上げた。この後、磁気ディスクを185nmの波長を含む低圧水銀ランプに20秒照射し、FT-IRで磁気ディスク上の化合物の平均膜厚を測定した。この膜厚をhÅとする。次に、温度30~40℃、湿度80~90RH%の環境下、5400rpmで潤滑剤を塗布した磁気ディスクを4週間高速回転させた。この後、磁気ディスク上に残った化合物の平均膜厚をFT-IRで測定した。この膜厚をcÅとする。高速回転下での磁気ディスクとの吸着性の強弱を示す指標として、潤滑剤保持率を下記式より算出した。
潤滑剤保持率(%)=100×c/h
試験例3(単分子膜厚の測定)
磁気ディスク上に塗布された潤滑剤の単分子膜厚(一分子あたりの膜厚)は、JOURNAL of TRIBOLOGY,OCTOBER 2004,VOL.126,PAGE751に記載されているように、ディスク上での潤滑剤の拡散挙動をエリプソメーターで観察する際に確認される。単分子膜厚は、潤滑剤被膜のテラス部位の膜厚として得られる。
2 記録層
3 保護層
4 潤滑層
Claims (3)
- 式(1):
C6H6-i-[O-(CH2)n-O-CH2―R-CH2-X]i (1)
(式中、nは2~6の整数であり、iは2または3の整数であり、Xは-OH、-O-(CH2)m-OH、-OCH2CH(OH)CH2OH、-OCH2CH(OH)CH2O-C6H5、または-OCH2CH(OH)CH2O-C6H4-OCH3で表される基である。mは1~6の整数である。Rは、-(CF2)pO(CF2O)x(CF2CF2O)y(CF2CF2CF2O)z(CF2CF2CF2CF2O)w(CF2)p-である。x及びyは、それぞれ0~30の実数である。zは0~30の実数である。wは0~20の実数である。pは1~3の整数である。)
で表される化合物。 - 式(1):
C6H6-i-[O-(CH2)n-O-CH2―R-CH2-X]i (1)
(式中、nは2~6の整数であり、iは2または3の整数であり、Xは-OH、-O-(CH2)m-OH、-OCH2CH(OH)CH2OH、-OCH2CH(OH)CH2O-C6H5、または-OCH2CH(OH)CH2O-C6H4-OCH3で表される基である。mは1~6の整数である。Rは、-(CF2)pO(CF2O)x(CF2CF2O)y(CF2CF2CF2O)z(CF2CF2CF2CF2O)w(CF2)p-である。x及びyは、それぞれ0~30の実数である。zは0~30の実数である。wは0~20の実数である。pは1~3の整数である。)
で表される化合物を含有する潤滑剤。 - 支持体上に少なくとも記録層及び保護層を形成し、その表面に潤滑層を有する磁気ディスクにおいて、該潤滑層が下記式(1):
C6H6-i-[O-(CH2)n-O-CH2―R-CH2-X]i (1)
(式中、nは2~6の整数であり、iは2または3の整数であり、Xは-OH、-O-(CH2)m-OH、-OCH2CH(OH)CH2OH、-OCH2CH(OH)CH2O-C6H5、または-OCH2CH(OH)CH2O-C6H4-OCH3で表される基である。mは1~6の整数である。Rは、-(CF2)pO(CF2O)x(CF2CF2O)y(CF2CF2CF2O)z(CF2CF2CF2CF2O)w(CF2)p-である。x及びyは、それぞれ0~30の実数である。zは0~30の実数である。wは0~20の実数である。pは1~3の整数である。)
で表される化合物を含有する磁気ディスク。
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US14/913,012 US9950980B2 (en) | 2013-12-17 | 2014-11-25 | Fluoropolyether compound, lubricant containing same, and magnetic disk |
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JPWO2018159232A1 (ja) * | 2017-03-02 | 2019-12-26 | 昭和電工株式会社 | 磁気記録媒体、含フッ素エーテル化合物および磁気記録媒体用潤滑剤 |
JP2021046424A (ja) * | 2020-12-02 | 2021-03-25 | 昭和電工株式会社 | 含フッ素エーテル化合物、磁気記録媒体用潤滑剤および磁気記録媒体 |
WO2021065380A1 (ja) * | 2019-10-01 | 2021-04-08 | 昭和電工株式会社 | 含フッ素エーテル化合物、磁気記録媒体用潤滑剤および磁気記録媒体 |
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US10529364B2 (en) | 2017-02-15 | 2020-01-07 | Seagate Technology Llc | Heat-assisted removal of head contamination |
US10373632B2 (en) * | 2017-02-15 | 2019-08-06 | Seagate Technology Llc | Heat-assisted removal of head contamination |
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