The invention provides a lube oil which exhibits low vapor pressure despite having low viscosity, is non-flammable, exhibits excellent heat resistance, has tribological characteristics equivalent to those of conventional hydrocarbon-based lube oils, and can be used for a long time under very severe
The invention provides a lube oil which exhibits low vapor pressure despite having low viscosity, is non-flammable, exhibits excellent heat resistance, has tribological characteristics equivalent to those of conventional hydrocarbon-based lube oils, and can be used for a long time under very severe conditions such as high temperature and vacuum. The lube oil contains, as a base oil, an ionic liquid formed of a cation and an anion and having an ion concentration of 1 mol/dm3 or more.
대표청구항▼
1. A method of lubricating an article, comprising providing to the article a lube oil, wherein the lube oil comprises, as a base oil, an ionic liquid having an ion concentration of 1 mol/dm3 or more in an amount of 90 to 100 mass %, wherein the ionic liquid has a total acid value of 1 mgKOH/g or les
1. A method of lubricating an article, comprising providing to the article a lube oil, wherein the lube oil comprises, as a base oil, an ionic liquid having an ion concentration of 1 mol/dm3 or more in an amount of 90 to 100 mass %, wherein the ionic liquid has a total acid value of 1 mgKOH/g or less and is represented by the formula Z+A− where Z+represents a cation and A− represents an anion; at least one of an antioxidant and an extreme pressure agent, wherein the cation (Z+) forming the ionic liquid is represented by any of the following formulae: wherein each of R1 to R6, which may be identical to or different from one another, represents a group selected from among a hydrogen atom, C1 to C18 alkyl groups which may each have an ether bond, and C1 to C18 alkoxy groups, wherein the anion (A−) forming the ionic liquid is BF4− or ((CnF2n+1−x)Hx)Y1Oz)2N−, wherein Y1 represents a carbon atom or a sulfur atom, wherein a plurality of Y1 are present, these may be identical or different from one another, a plurality of (CnF2n+1−x)Hx)Y1Oz groups may be identical or different from one another, n is an integer of from 1 to 6, x is an integer of from 0 to 13, and z is an integer of from 1 to 3 when Y1 is a carbon atom and 0 to 4 when Y1 is a sulfur atom, and wherein the article is an internal combustion engine, a torque converter, a fluid coupling, a radial bearing, a rolling bearing, an oil-retaining bearing, a fluid bearing, a compressor, a chain drive, a vacuum pump, a clock part, a hard disk apparatus, a refrigerator, a shock absorber, a corrosion prevention, a brake member, a sealing device, or an aerospace apparatus. 2. The method as claimed in claim 1, wherein the ionic liquid is a mixture of two or more ionic liquids. 3. The method as claimed in claim 1, wherein the ionic liquid does not contain a cation represented by the following formula: [F6] (wherein each of R1 to R5, which may be identical to or different from one another, represents a group selected from among a hydrogen atom, C1 to C18 alkyl groups which may each have an ether bond, and C1 to C18 alkoxy groups), F−, Cl−, Br−, or BF4−. 4. The method as claimed in claim 1, wherein the ionic liquid has a kinematic viscosity of 1 to 1,000 mm2/s as determined at 40° C. 5. The method as claimed in claim 1, wherein the ionic liquid has a pour point of −10° C. or lower. 6. The method as claimed in claim 1, wherein the ionic liquid has a viscosity index of 80 or more. 7. The method as claimed in claim 1, wherein the ionic liquid has a flash point of 200° C. or higher. 8. The method as claimed in claim 1, further comprising applying an electric field to the lube oil. 9. The method as claimed in claim 1, wherein the lube oil has a total acid value of 0.33 mgKOH/g or less. 10. The method of claim 1, wherein the ionic liquid is butylpyridinium bis(trifluoromethanesulfonyl)imide, N,N-diethyl-N-methyl(2-methoxyethyl)ammonium bis(trifluoromethanesulfonyl)imide, or N,N-diethyl-N-methyl(2-methoxyethyl)ammonium tetrafluoroborate.
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이 특허에 인용된 특허 (4)
Umamori Nobuharu (Ohigmachi JPX) Miyamoto Tetsuo (Ohigmachi JPX) Kanbara Makoto (Ohigmachi JPX) Tomizawa Hirotaka (Ohigmachi JPX), Electroviscous fluid mixed with esterified silica fine particles and polyhydric alcohol.
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