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
  • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
  • C10M169/04—Mixtures of base-materials and additives
  • C10M169/041—Mixtures of base-materials and additives the additives being macromolecular compounds only
• • 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
  • C10M101/00—Lubricating compositions characterised by the base-material being a mineral or fatty oil
  • C10M101/02—Petroleum fractions
• • 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
  • C10M171/00—Lubricating compositions characterised by purely physical criteria, e.g. containing as base-material, thickener or additive, ingredients which are characterised exclusively by their numerically specified physical properties, i.e. containing ingredients which are physically well-defined but for which the chemical nature is either unspecified or only very vaguely indicated
  • C10M171/02—Specified values of viscosity or viscosity index
• • 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
  • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
  • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
  • C10M2203/1006—Petroleum or coal fractions, e.g. tars, solvents, bitumen used as base material
• • 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
  • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
  • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
  • C10M2203/102—Aliphatic fractions
  • C10M2203/1025—Aliphatic fractions used as base material
• • 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
  • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
  • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
  • C10M2203/104—Aromatic fractions
  • C10M2203/1045—Aromatic fractions used as base material
• • 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
  • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
  • C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
  • C10M2209/08—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate type
  • C10M2209/084—Acrylate; Methacrylate
• • 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
  • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
  • C10N2020/01—Physico-chemical properties
  • C10N2020/02—Viscosity; Viscosity index
• • 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
  • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
  • C10N2020/01—Physico-chemical properties
  • C10N2020/04—Molecular weight; Molecular weight distribution
• • 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
  • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
  • C10N2020/01—Physico-chemical properties
  • C10N2020/065—Saturated Compounds
• • 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
  • C10N2030/02—Pour-point; Viscosity index
• • 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
  • C10N2040/04—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
• • 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
  • C10N2040/25—Internal-combustion engines

Definitions

• the present invention relates to a lubricating oil composition having a high viscosity index.
• lubricating oil compositions used as drive system oils such as automatic transmission oils (ATF), continuously variable transmission oils (CVTF), shock absorber oils (SAF), internal combustion engine oils, hydraulic fluids, etc.
• ATF automatic transmission oils
• CVTF continuously variable transmission oils
• SAF shock absorber oils
• internal combustion engine oils hydraulic fluids, etc.
• various properties are required depending on the application. For example, regarding the fuel efficiency of automobiles, the weight reduction of automobiles, the improvement of engines, etc., along with the improvement of automobiles themselves, the reduction of the viscosity of lubricating oils to prevent friction loss in drive system equipment and engines, etc., and various friction modifiers.
• Patent Document 1 discloses a lubricating oil composition using a mineral base oil that satisfies specific requirements.
• an object of the present invention is to provide a lubricating oil composition having a high viscosity index.
• a lubricating oil composition containing a base oil (A) satisfying specific requirements and a polymer (B) satisfying specific requirements can solve the above problems. rice field.
• Each embodiment of the present invention has been completed based on such findings. That is, according to each embodiment of the present invention, the following [1] to [14] are provided. [1] Containing a base oil (A) that satisfies the following requirements (A-1) to (A-4) and a polymer (B) that satisfies the following requirements (B-1) and (B-2): lubricating oil composition.
• ⁇ Requirement (A-1) The kinematic viscosity at 100°C is 2.0 mm 2 /s or more and less than 7.0 mm 2 /s.
• Requirement (A-2) The viscosity index is 100 or more.
• ⁇ Requirement (A-3) The content of cycloparaffins measured in accordance with ASTM D 2786-91 (2016) is 35.0% by volume or less based on 100% by volume of the total amount of base oil (A) be.
• Requirement (B-1) The ratio [Mw/Mn] of the mass average molecular weight (Mw) to the number average molecular weight (Mn) is 1.0 or more and less than 6.0.
• the lubricating oil composition according to any one of [1] to [9], which has a viscosity index of 300 or more.
• A-1 The kinematic viscosity at 100°C is 2.0 mm 2 /s or more and less than 7.0 mm 2 /s.
• Requirement (A-2) The viscosity index is 100 or more.
• ⁇ Requirement (A-3) The content of cycloparaffins measured in accordance with ASTM D 2786-91 (2016) is 35.0% by volume or less based on the total amount of base oil (A) 100% by volume. be.
• ⁇ Requirement (A-4) % CA is less than 1.0.
• Requirement (B-1) The ratio [Mw/Mn] between the mass average molecular weight (Mw) and the number average molecular weight (Mn) is 1.0 or more and less than 6.0.
• a lubricating method characterized by using the lubricating oil composition according to any one of [1] to [10] or the lubricating oil composition obtained by the production method according to [11].
• [13] Drive system equipment using the lubricating oil composition according to [1] to [10] or the lubricating oil composition obtained by the production method according to [11].
• a lubricating oil composition that is one embodiment of the present invention comprises a base oil (A) that satisfies the following requirements (A-1) to (A-4), and the following requirements (B-1) and (B-2): It contains a polymer (B) that satisfies the above conditions.
• A-1) The kinematic viscosity at 100°C is 2.0 mm 2 /s or more and less than 7.0 mm 2 /s.
• Requirement (A-2) The viscosity index is 100 or more.
• ⁇ Requirement (A-3) The content of cycloparaffins measured in accordance with ASTM D 2786-91 (2016) is 35.0% by volume or less based on the total amount of base oil (A) 100% by volume. be.
• ⁇ Requirement (A-4) % CA is less than 1.0.
• ⁇ Requirement (B-2) A peak integral value (I 10 ) at a chemical shift of 10.0 to 11.0 ppm obtained by 13 C-NMR analysis, and a peak integral value (I 14 ), the ratio [I 10 /I 14 ] is 0.05 or more.
• the lubricating oil composition does not contain the base oil (A) or the polymer (B), it becomes difficult to sufficiently improve the viscosity index.
• the lower limit values and upper limit values described stepwise for preferred numerical ranges can be independently combined.
• the description of the lower limit preferably 10 or more, more preferably 30 or more, more preferably 40 or more” and the upper limit "preferably 90 or less, more preferably 80 or less, more preferably 70 or less”
• a suitable range for example, "10 or more and 70 or less", “30 or more and 70 or less", “40 or more and 80 or less”.
• preferably 10 or more and 90 or less, more preferably 30 or more and 80 or less, still more preferably 40 or more and 70 or less "preferably 10 to 90, more preferably 30 to 80, more preferably 40 to The same applies to the preferred range that can be selected from the description such as "is 70".
• the description "10 to 90” is synonymous with “10 or more and 90 or less”.
• the term "hydrocarbon group” as used herein means a group composed only of carbon atoms and hydrogen atoms.
• the "hydrocarbon group” includes an "aliphatic group” composed of a straight or branched chain, an "alicyclic group” having one or more saturated or unsaturated carbon rings having no aromaticity, a benzene ring, etc. includes an "aromatic group” having one or more aromatic rings exhibiting the aromaticity of
• the number of ring-forming carbon atoms refers to the number of carbon atoms among atoms constituting the ring itself of a compound having a structure in which atoms are cyclically bonded. When the ring is substituted with a substituent, the carbon contained in the substituent is not included in the number of ring-forming carbon atoms.
• (meth)acrylate refers to both “acrylate” and “methacrylate”
• (meth)acryloyl group refers to both “acryloyl group” and “methacryloyl group”. and other similar terms.
• the base oil (A) (hereinafter also simply referred to as "component (A)") used in the lubricating oil composition is a base oil that satisfies the following requirements (A-1) to (A-4).
• ⁇ Requirement (A-1) The kinematic viscosity at 100°C is 2.0 mm 2 /s or more and less than 7.0 mm 2 /s.
• Requirement (A-2) The viscosity index is 100 or more.
• ⁇ Requirement (A-3) The content of cycloparaffins measured in accordance with ASTM D 2786-91 (2016) is 35.0% by volume or less based on the total amount of base oil (A) 100% by volume. be.
• the base oil (A) is a mixed oil in which two or more base oils are combined, the mixed oil may satisfy the above requirements.
• the requirement (A-1) stipulates the balance between the base oil evaporation loss and the fuel efficiency improvement effect. That is, if the 100° C. kinematic viscosity of the base oil (A) is less than 2.0 mm 2 /s, the evaporation loss increases, which is not preferable. On the other hand, if the 100° C. kinematic viscosity of the base oil (A) is 7.0 mm 2 /s or more, the power loss due to viscous resistance increases, which poses a problem in terms of the fuel efficiency improvement effect. Therefore, the 100° C.
• kinematic viscosity of the base oil (A) is preferably 2.1 mm 2 /s or more, more preferably 2.2 mm 2 /s or more, from the viewpoint of reducing the evaporation loss of the base oil (A). It is preferably 2.5 mm 2 /s or more, preferably 6.0 mm 2 /s or less, more preferably 5.5 mm 2 /s or less, still more preferably from the viewpoint of improving the fuel efficiency improvement effect of the base oil (A). is 5.0 mm 2 /s or less, more preferably 4.5 mm 2 /s or less.
• the 100° C as one aspect of the base oil (A), the 100° C.
• kinematic viscosity of the base oil (A) is preferably 2.1 to 6.0 mm 2 /s, more preferably 2.2 to 5.5 mm 2 /s. s, more preferably 2.5 to 5.0 mm 2 /s, even more preferably 2.5 to 4.5 mm 2 /s.
• the requirement (A-2) is a rule for making the base oil excellent in viscosity-temperature characteristics and fuel economy. That is, when the viscosity index of the base oil (A) is less than 100, viscosity-temperature characteristics and fuel efficiency decrease significantly, and the lubricating oil composition using the base oil (A) has excellent fuel efficiency. I have a problem with a point. From this point of view, the viscosity index of the base oil (A) is preferably 105 or higher, more preferably 110 or higher, and even more preferably 115 or higher.
• the lubricating oil composition contains the base oil (A) and the polymer (B) described later, even if the viscosity index of the base oil (A) itself is not high, the lubricating oil having a high viscosity index A composition may be provided. Therefore, the upper limit of the viscosity index of the base oil (A) is not particularly limited, but the viscosity index of the base oil (A) is preferably 145 or less, more preferably 140 or less, still more preferably 135 or less. In addition, as one aspect of the base oil (A), the viscosity index of the base oil (A) is preferably 105-145, more preferably 110-140, still more preferably 115-135.
• the base oil (A) used in the present invention has a cycloparaffin content measured in accordance with ASTM D 2786-91 (2016), as defined in requirement (A-3). Based on the total amount of 100% by volume, it is required to be 35.0% by volume or less.
• the requirement (A-3) is a provision for improving the viscosity index of the resulting lubricating oil composition.
• the lubricating oil composition contains a base oil (A) that satisfies the requirement (A-3) and a polymer (B) described later, so that it is compared with a lubricating oil composition that does not contain either component. and the viscosity index increases.
• the content of the cycloparaffins in the base oil (A) is preferably 34.0% by volume or less, more preferably 33.0% by volume or less, based on 100% by volume of the total amount of the base oil (A). More preferably, it is 32.0% by volume or less.
• the lower limit of the content of the cycloparaffins in the base oil (A) is not particularly limited, but the content of the cycloparaffins is, for example, preferably 0.1% by volume or more, more preferably 1.0% by volume. Above, more preferably at least 2.0% by volume.
• the content of the cycloparaffins in the base oil (A) is preferably 0.1 to 34.0% by volume, more preferably 1.0 to 33.0% by volume. %, more preferably 2.0 to 32.0% by volume.
• cycloparaffin content represents the ratio of molecules having a cycloparaffin skeleton, and includes single-ring cycloparaffins such as cyclopentane and cyclohexane, and single-ring cycloparaffins such as cyclopentane and cyclohexane. Those in which two or more rings of paraffin are bonded or condensed correspond.
• the cycloparaffin portion includes those in which the hydrogen atoms bonded to the ring-forming carbon atoms forming the cyclic structure are substituted with various substituents.
• the cycloparaffins include unsaturated alicyclic compounds such as cyclopentene and cyclohexene containing double bonds in their cyclic structures, but do not include aromatic compounds. Specifically, it is the content of cycloparaffins measured using the method described in Examples described later.
• the base oil (A) used in the present invention must have an aromatic content (% C A ) of less than 1.0, as specified in requirement (A-4).
• a lubricating oil composition containing a base oil (A) with an aromatic content (% C A ) adjusted to 1.0 or more is not preferable, for example, in terms of high-temperature detergency.
• the aromatic content (% C A ) of the base oil (A) is preferably 0.3 or less, more preferably 0.1 or less, and still more preferably 0.01 or less.
• the aromatic content (% C A ) of the base oil (A) is preferably 0 or more and less than 1.0, preferably 0 to 0.3, more preferably 0 to 0.1, still more preferably 0 ⁇ 0.01.
• the aromatic content (% C A ) indicates the ratio (percentage) of the aromatic content calculated by the ring analysis ndM method, and specifically, it is described in the examples described later. It is a value measured by a method measured using a method.
• the base oil (A) used in the lubricating oil composition preferably further satisfies the following requirement (A-5).
• the base oil (A) satisfies the requirement (A-5) from the viewpoint of improving the viscosity index.
• the content ratio [(R1)/(R2-6)] in the base oil (A) is more preferably 0.8 or less, still more preferably 0.7 or less in terms of volume ratio.
• the content ratio [(R1)/(R2-6)] is preferably 0.01 or more, more preferably 0.1 or more, and still more preferably 0.3 or more.
• the content ratio [(R1)/(R2-6)] in the base oil (A) is preferably 0.01 to 1.0 in terms of volume ratio. , more preferably 0.1 to 0.8, still more preferably 0.3 to 0.7.
• the base oil (A) for example, from the viewpoint of improving the viscosity index, the monocyclic cycloparaffin content in the base oil (A) measured according to ASTM D 2786-91 (2016)
• the content of (R1) is preferably 30.0% by volume or less, more preferably 0.1 to 20.0% by volume, still more preferably 1.0 to 20.0% by volume, based on 100% by volume of the total amount of the base oil (A) 13.0% by volume.
• the base oil (A) for example, from the viewpoint of improving the viscosity index, 2 to 6 rings in the base oil (A) measured according to ASTM D 2786-91 (2016)
• the content of the total cycloparaffin content (R2-6) below is preferably 0.1 to 25.0% by volume, more preferably 0.1 to 25.0% by volume, based on 100% by volume of the total amount of the base oil (A). 24.0% by volume, more preferably 1.0 to 23.0% by volume.
• the acyclic cycloparaffin content in the base oil (A) measured according to ASTM D 2786-91 (2016) The content of (R0) is preferably 60.0 to 100.0% by volume, more preferably 60.0 to 98.0% by volume, and still more preferably 65.0 to 90.0% by volume.
• the base oil (A) used in the lubricating oil composition preferably further satisfies the following requirement (A-6).
• A-6 The content of tricyclic cycloparaffins (R3) measured in accordance with ASTM D 2786-91 (2016) is 4. Less than 0% by volume.
• the base oil (A) satisfies the requirement (A-6) from the viewpoint of improving the viscosity index.
• the content of the tricyclic cycloparaffins (R3) in the base oil (A) is more preferably 3.8% by volume or less, still more preferably 3.5% by volume or less.
• the content of the tricyclic cycloparaffin (R3) in the base oil (A) is preferably 0 volume based on 100% by volume of the total amount of the base oil (A) % or more and less than 4.0% by volume, more preferably 0 to 3.8% by volume, still more preferably 0 to 3.5% by volume.
• the content of the base oil (A) is preferably 50.0% by mass or more, more preferably 60.0% by mass or more, based on 100% by mass of the total amount of the lubricating oil composition from the viewpoint of improving the viscosity index.
• the content of the base oil (A) is preferably 50.0 to 99.9% by mass, more preferably 50.0 to 99.9% by mass, based on the total amount of the lubricating oil composition 100% 60.0 to 99.5% by mass, more preferably 70.0 to 99.0% by mass, even more preferably 80.0 to 98.0% by mass, still more preferably 80.0 to 97.5% by mass is.
• the raw material of the base oil (A) for example, atmospheric residual oil obtained by atmospheric distillation of crude oil such as paraffinic crude oil, intermediate crude oil, naphthenic crude oil; lubricating oil fractions and mineral oil-based waxes obtained by the above processes; residue WAX in the GTL process (gas-to-liquid wax, hereinafter also referred to as "GTL wax”); and the like.
• the base oil (A) is, for example, the lubricating oil fraction subjected to solvent deasphalting treatment; at least one treatment of solvent extraction or hydrocracking; at least one dewaxing of solvent dewaxing or catalytic dewaxing oil refined by one or more, preferably all, of processing; hydrorefining; and the like; oil produced by isomerizing said mineral oil wax; GTL base oils produced by isomerization dewaxing;
• the base oil (A) is more preferably at least one selected from base oils classified into Group II and base oils classified into Group III of the American Petroleum Institute (API) base oil category. , Group III are more preferred.
• the base oil may be used alone or in combination of two or more.
• One aspect of the base oil (A) and its raw material includes those described above, and the base oil (A) that satisfies the requirements (A-1) to (A-4) is, for example, the following items: It can be prepared by taking appropriate considerations. The matters below are an example of the method for preparing the base oil (A), and the base oil (A) can also be prepared by considering matters other than these.
• the base oil (A) is preferably one obtained by refining a raw material oil.
• the raw material oil is preferably a raw material oil containing a petroleum-derived wax, and a raw material oil containing a petroleum-derived wax and a bottom oil.
• the content ratio of wax and bottom oil [wax/bottom oil] in the base oil is determined from the viewpoint of a base oil that satisfies the above requirements. The ratio is preferably 55/45 to 95/5, more preferably 70/30 to 95/5, still more preferably 80/20 to 95/5.
• bottom oil in a normal fuel oil production process using crude oil as a raw material, oil containing heavy fuel oil obtained from a vacuum distillation unit is hydrocracked to separate and remove naphtha and kerosene. The remaining bottoms fraction is mentioned.
• wax in addition to the wax separated by dewaxing the bottom fraction with a solvent, crude oil such as paraffinic crude oil, intermediate crude oil, and naphthenic crude oil may be distilled under atmospheric pressure to separate and remove naphtha and light oil.
• Wax obtained by solvent dewaxing the atmospheric residue remaining after dewaxing Wax obtained by solvent dewaxing the distillate obtained by vacuum distillation of the atmospheric residue; Solvent deasphalting the distillate, Wax obtained by solvent dewaxing after solvent extraction and hydrofinishing; GTL wax obtained by Fischer-Tropsch synthesis;
• the solvent-dewaxed oil includes the residual oil after solvent dewaxing the bottom fraction and the like and separating and removing the wax. Moreover, the solvent-dewaxed oil is subjected to a refining treatment of solvent dewaxing, and is different from the above-mentioned bottom oil.
• a method of obtaining the wax by solvent dewaxing for example, a method of mixing the bottom fraction with a mixed solvent of methyl ethyl ketone and toluene and removing precipitates while stirring in a low temperature environment is preferable.
• the specific temperature in the low-temperature environment in solvent dewaxing is preferably lower than the temperature in general solvent dewaxing. It is preferably 25°C or lower, more preferably -30°C or lower.
• the oil content of the feedstock is preferably 5 to 55% by mass, more preferably 7 to 45% by mass, even more preferably 10 to 35% by mass, and even more preferably 15 to 50% by mass, from the viewpoint of a base oil that satisfies the above requirements. 32% by mass, more preferably 21 to 30% by mass.
• the kinematic viscosity of the raw material oil at 100° C. is preferably 2.0 to 7.0 mm 2 /s, more preferably 2.3 to 6.5 mm, from the viewpoint of making the base oil satisfying the requirement (A-1). 2 /s, more preferably 2.5 to 6.0 mm 2 /s.
• the viscosity index of the raw material oil is preferably 100 or higher, more preferably 110 or higher, and still more preferably 120 or higher, from the viewpoint of obtaining a base oil that satisfies the above requirements.
• the refining treatment preferably includes at least one of hydroisomerization dewaxing treatment and hydrotreating.
• the type of refining treatment and refining conditions are preferably appropriately set according to the type of raw material oil used. More specifically, from the viewpoint of obtaining a base oil that satisfies the above requirements, it is preferable to select a refining treatment as follows according to the type of feedstock used.
• both hydroisomerization dewaxing treatment and hydrotreating are performed on the feedstock oil (a1) It is preferable to carry out a purification treatment including.
• the feedstock oil (a2) containing solvent dewaxed oil it is preferable that the feedstock oil (a2) is not subjected to hydroisomerization dewaxing treatment but is subjected to refining treatment including hydrotreating.
• the feedstock oil (a1) contains bottom oil, the contents of aromatics, sulfur, and nitrogen tend to increase. , and nitrogen can be removed to reduce their contents.
• the hydroisomerization dewaxing process isomerizes the straight chain paraffins in the wax into branched chain isoparaffins, making it particularly easy to prepare a base oil that meets the above requirements.
• the aromatic content is ring-opened and converted to paraffin content, so the aromatic content (% CA) can be reduced, and a base oil that satisfies the above requirements can be prepared. becomes easier.
• the raw material oil (a2) contains wax, but since linear paraffin is separated and removed by precipitating and separating it in a low-temperature environment by solvent dewaxing treatment, linear paraffin that affects the value of the above requirement content is low. Therefore, the necessity of performing "hydroisomerization dewaxing treatment" is low.
• the hydroisomerization dewaxing process includes isomerization of straight-chain paraffins contained in the feedstock to branched-chain isoparaffins, conversion of aromatics to ring-opening paraffins, This is a refining process for the purpose of removing impurities such as nitrogen.
• the hydroisomerization dewaxing treatment is preferably carried out in the presence of a hydroisomerization dewaxing catalyst.
• hydroisomerization dewaxing catalysts include silica aluminophosphate (SAPO), zeolite, and other carriers containing nickel (Ni)/tungsten (W), nickel (Ni)/molybdenum (Mo), cobalt (Co), /Metal oxides such as molybdenum (Mo), and catalysts carrying noble metals such as platinum (Pt) and lead (Pd).
• SAPO silica aluminophosphate
• zeolite zeolite
• other carriers containing nickel (Ni)/tungsten (W), nickel (Ni)/molybdenum (Mo), cobalt (Co), /Metal oxides such as molybdenum (Mo), and catalysts carrying noble metals such as platinum (Pt) and lead (Pd).
• the hydrogen partial pressure in the hydroisomerization dewaxing treatment is preferably 2.0 to 220 MPa, more preferably 2.5 to 100 MPa, and still more preferably 3.0 to 50 MPa from the viewpoint of obtaining a base oil that satisfies the above requirements. , and more preferably 3.5 to 25 MPa.
• the reaction temperature in hydroisomerization dewaxing treatment is preferably set higher than the reaction temperature in general hydroisomerization dewaxing treatment from the viewpoint of obtaining a base oil that satisfies the above requirements. Specifically, it is preferably 320 to 480°C, more preferably 325 to 420°C, still more preferably 330 to 400°C, and even more preferably 340 to 370°C.
• the liquid hourly space velocity (LHSV) in the hydroisomerization dewaxing treatment is preferably 5.0 hr -1 or less, more preferably 2.0 hr -1 or less, from the viewpoint of a base oil that satisfies the above requirements. It is more preferably 1.0 hr -1 or less, still more preferably 0.6 hr -1 or less.
• the LHSV in the hydroisomerization dewaxing treatment is preferably 0.1 hr -1 or more, more preferably 0.2 hr -1 or more.
• the supply ratio of hydrogen gas in the hydroisomerization dewaxing process is preferably 100 to 1,000 Nm 3 , more preferably 200 to 800 Nm 3 , still more preferably 250 to 650 Nm per kiloliter of feedstock oil to be supplied. 3 .
• vacuum distillation may be applied to the oil that has been subjected to the hydroisomerization dewaxing treatment in order to remove light fractions.
• Hydrotreating is a refining process that is performed for the purpose of completely saturating the aromatics contained in the raw oil and removing impurities such as sulfur and nitrogen. Hydrotreating is preferably carried out in the presence of a hydrogenation catalyst.
• hydrogenation catalysts include silica/alumina, amorphous such as alumina, and crystalline carriers such as zeolite, nickel (Ni)/tungsten (W), nickel (Ni)/molybdenum (Mo), cobalt (Co )/metal oxides such as molybdenum (Mo), and catalysts supporting noble metals such as platinum (Pt) and lead (Pd).
• the hydrogen partial pressure in the hydrotreating is preferably set higher than the pressure in general hydrotreating from the viewpoint of obtaining a base oil that satisfies the above requirements, specifically, preferably 16 MPa or more. , more preferably 17 MPa or more, still more preferably 20 MPa or more, and preferably 30 MPa or less, more preferably 22 MPa or less.
• the reaction temperature in the hydrotreating is preferably 200 to 400°C, more preferably 250 to 350°C, still more preferably 280 to 330°C, from the viewpoint of obtaining a base oil that satisfies the above requirements.
• the liquid hourly space velocity (LHSV) in the hydrotreating is preferably 5.0 hr -1 or less, more preferably 2.0 hr -1 or less, still more preferably 1.0 hr, from the viewpoint of a base oil that satisfies the above requirements. ⁇ 1 or less, and from the viewpoint of productivity, it is preferably 0.1 hr ⁇ 1 or more, more preferably 0.2 hr ⁇ 1 or more, still more preferably 0.3 hr ⁇ 1 or more.
• the supply rate of hydrogen gas in hydrotreating is preferably 100 to 1,000 Nm 3 , more preferably 200 to 800 Nm 3 , still more preferably 250 to 650 Nm 3 per kiloliter of feed oil to be treated. be.
• the hydrotreated oil may be subjected to vacuum distillation in order to remove light fractions.
• Various conditions (pressure, temperature, time, etc.) for vacuum distillation are appropriately adjusted so that the kinematic viscosity of the base oil at 100° C. is within the desired range.
• the polymer (B) (hereinafter also simply referred to as "component (B)") used in the lubricating oil composition is a polymer that satisfies the following requirements (B-1) and (B-2).
• Requirement (B-1) The ratio [Mw/Mn] between the mass average molecular weight (Mw) and the number average molecular weight (Mn) is 1.0 or more and less than 6.0.
• the ratio [Mw/Mn] related to the requirement (B-1) is 1.0 or more, it is advantageous from the viewpoint of improving the viscosity index.
• the ratio [Mw/Mn] is usually less than 6.0.
• the ratio [Mw/Mn] of component (B) is preferably 1.2 or more, more preferably 1.5 or more, still more preferably 1.8 or more, and preferably 5.5. It is 5 or less, more preferably 5.0 or less, and still more preferably 3.0 or less.
• the ratio [Mw/Mn] of the component (B) is preferably 1.2 to 5.5, more preferably 1.5 to 5.5, still more preferably 1.5 to 5.0, more preferably 1.8 to 3.0.
• the component (B) preferably has a mass average molecular weight (Mw) of 1,000 or more, more preferably 5,000 or more, still more preferably 20,000 or more, and even more preferably 100,000 or more, and preferably 1,000,000 or less, more preferably 900,000 or less, even more preferably 800,000 or less, even more preferably 700,000 or less.
• Mw mass average molecular weight
• the mass average molecular weight (Mw) of the component (B) is preferably 1,000 to 1,000,000, more preferably 5,000 to 900,000, even more preferably is between 20,000 and 800,000, even more preferably between 100,000 and 700,000.
• mass average molecular weight (Mw) and number average molecular weight (Mn) of each component are values converted to standard polystyrene measured by gel permeation chromatography (GPC). It literally means a value measured by the method described in Examples.
• Component (B) used in the present invention as defined in requirement (B-2), has a peak integral value (I 10 ) at a chemical shift of 10.0 to 11.0 ppm obtained by 13 C-NMR analysis, and a chemical The ratio [I 10 /I 14 ] to the peak integrated value (I 14 ) of shift 13.5 to 14.5 ppm should be 0.05 or more.
• the requirement (B-2) is a requirement necessary to improve the viscosity index of the lubricating oil composition to be obtained.
• a lubricating oil composition that does not contain component (B) and contains a polymer that does not satisfy the requirement (B-2) has a viscosity of The index cannot be increased to the desired value.
• the lubricating oil composition which is one embodiment of the present invention, contains the above-described base oil (A) and the polymer (B) that satisfies the requirement (B-2), so that either component Viscosity index is increased compared to a lubricating oil composition without it.
• the ratio [I 10 /I 14 ] of component (B) is preferably 0.06 or more, more preferably 0.08 or more, and still more preferably 0.10 or more.
• the ratio [I 10 /I 14 ] of component (B) is preferably 5.00 or less, more preferably 2.50 or less, still more preferably 2.00 or less, from the viewpoint of improving the viscosity index. It is preferably 1.00 or less, and more preferably 0.60 or less.
• the ratio [I 10 /I 14 ] of component (B) is preferably 0.05 to 5.00, more preferably 0.06 to 5.00, and further It is preferably 0.08 to 2.50, more preferably 0.08 to 2.00, still more preferably 0.10 to 1.00, and still more preferably 0.10 to 0.60.
• the peak at the chemical shift of 10.0 to 11.0 ppm obtained by 13 C-NMR analysis indicates that the polymer has a high-molecular-weight side chain derived from a macromonomer described later as a side chain in its molecular structure. and represents that it has a carbon atom related to the terminal methyl group of the alkyl chain further branched from the high molecular weight side chain, and the peak integral value (I 10 ) is the total carbon atoms in the polymer molecule It represents the ratio of carbon atoms of the terminal methyl group contained therein.
• the term "macromonomer” means a high-molecular-weight monomer having a polymerizable functional group.
• Examples of the polymerizable functional group include a methacryloyl group, an acryloyl group, an ethenyl group, a vinyl ether group, an allyl group, etc. Among these, a methacryloyl group or an acryloyl group is preferable, and a methacryloyl group is more preferable. Further, in this specification, a partial structure derived from a high molecular weight chain in a macromonomer in a polymer is regarded as a side chain in the polymer even if the partial structure has a high molecular weight. That is, the partial structure may be referred to as a "high-molecular-weight side chain" as described above.
• the peak at the chemical shift of 13.5 to 14.5 ppm obtained by 13 C-NMR analysis indicates that the polymer has a branched structure having a linear alkyl group having 4 or more carbon atoms as a side chain in its molecular structure. and has a carbon atom related to the terminal methyl group of the linear alkyl group having 4 or more carbon atoms in the side chain, and the peak integral value (I 14 ) is the polymer molecule It represents the ratio of carbon atoms of the terminal methyl group of the linear alkyl group having 4 or more carbon atoms contained in all the carbon atoms in the above.
• the ratio [I 10 /I 14 ] can be, for example, by increasing the amount of carbon atoms associated with (I 10 ), given a constant amount of the carbon atoms associated with (I 14 ). increased and can be reduced by reducing the amount of said carbon atoms associated with (I 10 ). Further, when the amount of the carbon atoms related to (I 10 ) is constant, the amount of the carbon atoms related to (I 14 ) is decreased by increasing the amount of the carbon atoms related to (I 14 ). can be increased by reducing the amount of That is, the ratio [I 10 /I 14 ] can also be adjusted by increasing or decreasing the amount of each carbon atom-forming monomer for the monomers constituting component (B).
• the content of the structural unit (p 10 ) containing carbon related to the chemical shift peak of 10.0 to 11.0 ppm in the component (B) constitutes the component (B).
• it is preferably 0.1 mol % or more, more preferably 0.5 mol % or more, still more preferably 0.7 mol % or more, and preferably 10.0 mol % or less, more preferably It is 5.0 mol % or less, more preferably 2.5 mol % or less.
• the content (p 14 ) of the structural unit containing carbon related to the chemical shift peak of 13.5 to 14.5 ppm in component (B) constitutes component (B).
• component (B) Based on the total amount of structural units of 100 mol%, preferably 50.0 mol% or more, more preferably 80.0 mol% or more, still more preferably 90.0 mol% or more, and preferably 99.9 mol% or less, more preferably It is 99.5 mol % or less, more preferably 99.0 mol % or less.
• the total content of the structural units (p 10 ) and (p 14 ) is preferably 50.0 mol % or more based on 100 mol % of the total amount of the structural units constituting the component (B). , more preferably 80.0 mol % or more, still more preferably 90.0 mol % or more, and preferably 100 mol % or less.
• the total amount of the structural units constituting the component (B) is 100 mol% does not include structural units derived from polymerization initiators and chain transfer agents, and monomers (monomers ) refers to the total amount of structural units derived from.
• Component (B) may be any polymer that satisfies the above requirements (B-1) and (B-2), For example, it is preferably a polyalkyl(meth)acrylate-based polymer (hereinafter also referred to as "PMA-based polymer”) containing structural units derived from alkyl(meth)acrylate.
• PMA-based polymer polyalkyl(meth)acrylate-based polymer
• the form of the copolymer may be, for example, a random addition polymer, an alternating copolymer, a graft copolymer, or a block copolymer. good.
• component (B) a polymer having a structure having many trigeminal branch points in the main chain from which high-molecular-weight side chains are present (hereinafter also referred to as a "comb-shaped polymer”), or a branched polymer. It may be a polymer having a specific structure such as a star polymer having a structure in which three or more chain polymers are bonded at one point.
• the component (B) may contain a comb-shaped polymer.
• a comb-shaped polymer for example, a polymer having at least a constitutional unit derived from the macromonomer having a polymerizable functional group as described above is preferably exemplified.
• the structural unit corresponds to the aforementioned "high molecular weight side chain".
• the component (B) includes alkyl (meth)acrylates, nitrogen atom-containing systems, halogen element-containing systems, hydroxyl group-containing systems, aliphatic hydrocarbon systems, alicyclic hydrocarbon systems, and aromatic hydrocarbon systems.
• Preferable examples include copolymers having side chains containing structural units derived from macromonomers having the above-mentioned polymerizable functional groups, with respect to main chains containing structural units derived from various vinyl monomers such as hydrogen-based vinyl monomers.
• the number average molecular weight (Mn) of the macromonomer is preferably 200 or more, more preferably 300 or more, still more preferably 400 or more, and preferably 100,000 or less, more preferably 50,000 or less, and still more preferably is less than or equal to 10,000.
• Component (B) is, as described above, a polymer having a partial structure associated with the chemical shift peak of 10.0 to 11.0 ppm and a partial structure associated with the chemical shift peak of 13.5 to 14.5 ppm.
• the monomer constituting the partial structure associated with the chemical shift peak of 10.0 to 11.0 ppm includes, for example, a macromonomer ( ⁇ ).
• the macromonomer ( ⁇ ) preferably has a (meth)acryloyl group at one end and a structural unit derived from a monomer ( ⁇ 1) selected from butadiene and hydrogenated butadiene.
• the polymer having the structural unit derived from the monomer ( ⁇ 1) in the macromonomer ( ⁇ ) corresponds to the above-mentioned "high molecular weight side chain".
• the main chain of component (B) preferably has a structural unit derived from the polymerizable functional group possessed by the macromonomer ( ⁇ ) and has a structural unit derived from a (meth)acryloyl group. , and a methacryloyl group.
• the number average molecular weight (Mn) of the macromonomer ( ⁇ ) is preferably 300 or more, more preferably 500 or more, still more preferably 1,000 or more, still more preferably 2,000 or more, and even more preferably 4,000 or more. is. Also, it is preferably 100,000 or less, more preferably 50,000 or less, even more preferably 20,000 or less, and even more preferably 10,000 or less.
• the macromonomer ( ⁇ ) has, in addition to the constituent units derived from the monomer ( ⁇ 1), one or more repeating units represented by the following general formulas (ci) to (c-iii). may be
• R c1 represents a linear or branched alkylene group having 1 to 10 carbon atoms. Specifically, methylene group, ethylene group, 1,2-propylene group, 1,3-propylene group, pentylene group, hexylene group, heptylene group, octylene group, nonylene group, decylene group, 2-ethylhexylene group, etc. are mentioned.
• R c2 represents a linear or branched alkylene group having 2 to 4 carbon atoms.
• R c3 represents a hydrogen atom or a methyl group.
• R c4 represents a linear or branched alkyl group having 1 to 10 carbon atoms.
• methyl group, ethyl group, n-propyl group, n-butyl group, n-pentyl group, n-hexyl group, n-heptyl group, n-octyl group, n-nonyl group, n-decyl group isopropyl group, isobutyl group, sec-butyl group, tert-butyl group, isopentyl group, tert-pentyl group, isohexyl group, tert-hexyl group, isoheptyl group, tert-heptyl group, 2-ethylhexyl group, isooctyl group, isononyl group, isodecyl group, and the like.
• each of the repeating units represented by the general formulas (ci) to (c-iii) has a plurality of repeating units
• each of R c1 , R c2 , R c3 and R c4 may be the same. , may be different from each other.
• the macromonomer ( ⁇ ) is a copolymer
• the form of copolymerization may be a block copolymer or a random copolymer.
• the content of structural units derived from the macromonomer ( ⁇ ) in component (B) is preferably 0.1 mol % or more, more preferably 0.1 mol % or more, based on 100 mol % of the total amount of structural units constituting component (B). 5 mol% or more, more preferably 0.7 mol% or more, and from the viewpoint of improving the viscosity index, preferably 10.0 mol% or less, more preferably 5.0 mol% or less, further preferably 2.5 mol% or less be.
• the structural unit derived from the macromonomer ( ⁇ ) contained in the component (B) may be of one type alone, or may be of two or more types.
• component (B) preferably contains a structural unit derived from the macromonomer ( ⁇ ) and a structural unit derived from the monomer (m1) represented by the following general formula (b1).
• R 11 is a hydrogen atom or a methyl group.
• R 12 represents a single bond, -O- or -NH-.
• R 13 represents a linear or branched alkylene group having 2 to 4 carbon atoms.
• n1 represents an integer of 0-20. When n1 is an integer of 2 or more, a plurality of R 13 may be the same or different, and the (R 13 O) n1 portion may be random copolymerized or block copolymerized.
• R 14 is a non-cyclic alkyl group having 4 to 9 carbon atoms or a group having 6 to 8 carbon atoms having a cyclic alkyl group. However, the case where n1 is an integer of 1 to 20 and R 14 is an acyclic alkyl group having 4 or 5 carbon atoms is excluded.
• the monomer in which R 14 is a straight-chain alkyl group having 4 to 9 carbon atoms is the above chemical It corresponds to the monomer constituting the partial structure related to the peak at the shift of 13.5-14.5 ppm.
• R 14 is preferably a C 6-8 group having a C 4 or C 5 acyclic alkyl group or a C 6-8 cyclic alkyl group.
• the number of carbon atoms in a group having a cyclic alkyl group means the total number of carbon atoms contained in the group having a cyclic alkyl group.
• Specific examples of the non-cyclic alkyl group having 4 or 5 carbon atoms include n-butyl group, isobutyl group, sec-butyl group, tert-butyl group, n-pentyl group, neopentyl group, isopentyl group and sec-pentyl group. , tert-pentyl group, 3-pentyl group and the like. Among these, an n-butyl group or an n-pentyl group is preferable, and an n-butyl group is more preferable.
• Specific examples of the group having 6 to 8 carbon atoms and having a cyclic alkyl group include a cyclohexyl group, a methylcyclohexyl group, an ethylcyclohexyl group, a dimethylcyclohexyl group, a cyclohexylmethyl group, a methylcyclohexylmethyl group, a cyclohexylethyl group, and the like. mentioned.
• R 11 is preferably a methyl group.
• R 12 is preferably —O—.
• R 13 is preferably a linear alkylene group having 2 to 3 carbon atoms, more preferably an ethylene group. That is, the monomer (m1) preferably has an acryloyl group or a methacryloyl group, more preferably a methacryloyl group, as a polymerizable functional group.
• n1 is preferably 0 to 5, more preferably 0 to 2, even more preferably 0. That is, n-butyl methacrylate is preferred as the monomer (m1).
• the content of the constituent units derived from the monomer (m1) is preferably 50.0 mol% based on 100 mol% of the total amount of the constituent units constituting the component (B) from the viewpoint of improving the viscosity index.
• the constituent units derived from the monomer (m1) in the component (B) may be of one type alone, or may be of two or more types.
• component (B) contains structural units derived from the monomer (m2), which is an alkyl (meth)acrylate having a linear alkyl group having 10 to 30 carbon atoms or a branched alkyl group having 10 to 30 carbon atoms. is preferred.
• the component (B) further contains a structural unit derived from the monomer (m2), the solubility in the base oil can be easily improved, and the effect of the present invention can be exhibited more easily.
• Alkyl methacrylate is preferable as the monomer (m2).
• the number of carbon atoms in the alkyl group of the monomer (m2) is preferably 10-24, more preferably 11-22, still more preferably 12-20.
• the alkyl group is preferably a linear alkyl group.
• the alkyl (meth)acrylate monomer having a straight-chain alkyl group having 10 to 30 carbon atoms has the chemical shift 13.1 in the component (B). It corresponds to the monomer constituting the partial structure related to the peak of 5 to 14.5 ppm.
• the content of the structural unit derived from the monomer (m2) is preferably 0.1 mol based on 100 mol% of the total amount of the structural units constituting the component (B) from the viewpoint of improving the viscosity index.
• % or more more preferably 1.0 mol% or more, still more preferably 2.5 mol% or more, still more preferably 5.0 mol% or more, still more preferably 6.0 mol% or more, still more preferably 7.0 mol% or more and is preferably 50.0 mol% or less, more preferably 40.0 mol% or less, still more preferably 30.0 mol% or less, even more preferably 20.0 mol% or less, still more preferably 15.0 mol% or less is.
• the constituent units derived from the monomer (m2) in the component (B) may be of one type alone, or may be of two or more types.
• component (B) may further contain structural units derived from the monomer (m3) represented by the following general formula (b3).
• R 21 is a hydrogen atom or a methyl group.
• R 22 represents a single bond, -O- or -NH-.
• R 23 represents a linear or branched alkylene group having 2 to 4 carbon atoms.
• n2 represents an integer of 1-20. When n2 is an integer of 2 or more, multiple R 23 may be the same or different, and the (R 23 O) n2 moiety may be random copolymerized or block copolymerized.
• R 24 is a linear alkyl group having 1 to 12 carbon atoms or a branched alkyl group having 1 to 12 carbon atoms.
• the monomer in which R 24 is a straight-chain alkyl group having 4 to 12 carbon atoms is the above chemical It corresponds to the monomer constituting the partial structure related to the peak at the shift of 13.5-14.5 ppm.
• the component (B) further contains a structural unit derived from the monomer (m3) represented by the general formula (b3), since the viscosity index of the obtained lubricating oil composition can be more easily improved.
• R 21 is preferably a methyl group.
• R 22 is preferably -O-. That is, the monomer (m3) preferably has an acryloyl group or a methacryloyl group, more preferably a methacryloyl group, as a polymerizable functional group.
• n2 is preferably 1 to 5, more preferably 1 to 2, even more preferably 1.
• R 23 is preferably a linear alkylene group having 2 to 3 carbon atoms, more preferably an ethylene group.
• R 24 is preferably a linear alkyl group having 1 to 12 carbon atoms, more preferably a linear alkyl group having 2 to 8 carbon atoms, and a linear alkyl group having 2 to 6 carbon atoms.
• a straight-chain alkyl group is more preferred, and an n-butyl group is even more preferred.
• the content of the structural unit derived from the monomer (m3) in the component (B) is, from the viewpoint of improving the viscosity index, Preferably 0.1 mol% or more, more preferably 1.0 mol% or more, still more preferably 3.0 mol% or more, still more preferably 5.0 mol% based on 100 mol% of the total amount of structural units constituting component (B) and is preferably 15.0 mol % or less, more preferably 14.0 mol % or less, still more preferably 13.0 mol % or less, and even more preferably 12.0 mol % or less.
• the constituent units derived from the monomer (m3) contained in the component (B) may be of one type alone, or may be of two or more types.
• the above-described macromonomer ( ⁇ ), monomer (m1), monomer (m2), and monomer Structural units derived from monomers other than body (m3) may also be included.
• the other monomers include alkyl (meth)acrylates having a linear alkyl group having 1 to 3 carbon atoms or a branched alkyl group having 1 to 3 carbon atoms, such as methyl (meth)acrylate; styrene; One or more selected from N-alkyl(meth)acrylamides and the like can be mentioned.
• the total content of the structural units derived from the macromonomer ( ⁇ ) and the structural units derived from the monomers (m1) to (m3) is the structural units constituting the component (B) from the viewpoint of improving the viscosity index. Based on the total amount of 100 mol%, preferably 85 to 100 mol%, more preferably 90 to 100 mol%, still more preferably 95 to 100 mol%.
• the structural units derived from other monomers contained in the component (B) may be of one type alone, or may be of two or more types.
• the component (B) is preferably a PMA polymer having a PSSI of 30 or less.
• PSSI means Permanent Shear Stability Index, and indicates the ability of a polymer to resist decomposition. The lower the PSSI, the more shear stable the polymer and the less likely it is to degrade. PSSI indicates the percentage of viscosity reduction due to shear derived from the polymer, and is calculated by the following formula defined in ASTM D6022-06 (2012).
• Kv 0 is the 100° C. kinematic viscosity of a mixture of base oil and polymer.
• Kv 1 is the 100° C. kinematic viscosity value after passing a mixture of base oil plus polymer through a high shear Bosch diesel injector for 30 cycles according to the procedure of ASTM D6278.
• Kv oil is the 100° C. kinematic viscosity of the base oil.
• a Group II base oil having a kinematic viscosity of 5.35 mm 2 /s at 100° C. and a viscosity index of 105 is used as the base oil.
• the PSSI is preferably 10 or less, more preferably 5.0 or less, even more preferably 3.0 or less, and even more preferably 2.0 or less. Also, the lower limit of the PSSI is not particularly limited, but is 0 or more, for example.
• the content of the component (B) can be appropriately adjusted in order to set the kinematic viscosity of the lubricating oil composition to a desired value.
• Based on the total amount (100% by mass) of the product preferably 0.1% by mass or more, more preferably 0.5% by mass or more, still more preferably 1.0% by mass or more, and even more preferably 2.0% by mass or more , More preferably 2.5% by mass or more, and preferably 30.0% by mass or less, more preferably 20.0% by mass or less, still more preferably 15.0% by mass or less, still more preferably 10% by mass 0 mass % or less, more preferably 5.0 mass % or less.
• the content of component (B) is preferably 0.1 to 30.0% by mass, more preferably 0, based on the total amount of 100% by mass of the lubricating oil composition. .5 to 20.0% by mass, more preferably 1.0 to 15.0% by mass, even more preferably 2.0 to 10.0% by mass, still more preferably 2.0 to 5.0% by mass, Even more preferably, it is 2.5 to 5.0% by mass.
• Component (B) can be prepared using known polymerization methods. For example, in order to satisfy the requirements (B-1) and (B-2) described above, select monomers that constitute the polymer so as to contain monomers that are raw materials for each of the structural units described above, and It can be obtained by radically polymerizing a monomer.
• the polymerization method conventionally known methods such as solution polymerization method, emulsion polymerization method, suspension polymerization method, reverse phase suspension polymerization method, thin film polymerization method, and spray polymerization method can be used.
• a solution polymerization method is preferred, and it can be obtained by radically polymerizing monomers, which are raw materials for the respective structural units, in a solvent.
• the component (B) when the component (B) is produced by solution polymerization, in a solvent, using a polymerization initiator, the structural units (p 10 ) and (p 14 ), and, if necessary, other structural units. It can be obtained by radically polymerizing a polymer.
• the solvent may be any solvent as long as it dissolves the monomer.
• Aromatic hydrocarbon solvents such as toluene, xylene, alkylbenzene having 9 to 10 carbon atoms; Aliphatic hydrocarbon solvents having a number of 5 to 18; Alcohol solvents having 3 to 8 carbon atoms such as 2-propanol, 1-butanol, 2-butanol and 1-octanol; Ketone solvents such as methyl isobutyl ketone and methyl ethyl ketone; Amide solvents such as N,N-dimethylformamide and N-methylpyrrolidone; and base oils; and the like can be used.
• the base oil is preferred, and among the base oils, the base oil (A) is more preferred.
• polymerization initiator examples include one or more selected from the group consisting of azo initiators, peroxide initiators, redox initiators, and organic halogen compound initiators.
• the polymerization initiator used for the polymerization of component (B) is preferably one or more selected from azo initiators and peroxide initiators, more preferably one selected from azo initiators and organic peroxides. More than one species, more preferably an azo initiator, can be used.
• azo polymerization initiators examples include 2,2′-azobis(isobutyronitrile) (abbreviation: AIBN), 2,2′-azobis(2-methylbutyronitrile) (abbreviation: AMBN), 2, 2′-azobis(2,4-dimethylvaleronitrile) (abbreviation: ADVN), 4,4′-azobis(4-cyanovaleric acid) (abbreviation: ACVA) and salts thereof (for example, hydrochloride etc.), dimethyl 2, 2'-azobis isobutyrate, 2,2'-azobis(2-amidinopropane) hydrochloride, 2,2'-azobis[2-methyl-N-(2-hydroxyethyl)propionamide] and the like. .
• AIBN 2,2′-azobis(isobutyronitrile)
• AMBN 2,2′-azobis(2-methylbutyronitrile)
• ADVN 2, 2′-azobis(2,4-dimethylvaleronitrile)
• peroxide-based initiators include inorganic peroxides and organic peroxides.
• inorganic peroxides include hydrogen peroxide, ammonium persulfate, potassium persulfate, and sodium persulfate.
• organic peroxides include benzoyl peroxide, di-tert-butyl peroxide, cumene hydroperoxide, succinic peroxide, di(2-ethoxyethyl)peroxydicarbonate, and tert-butyl peroxypivalate.
• tert-hexyl peroxypivalate tert-butyl peroxyneoheptanoate, tert-butyl peroxyneodecanoate, tert-butyl peroxy 2-ethylhexanoate, tert-butyl peroxyisobutyrate, tert-amylperoxy 2-ethylhexanoate, 1,1,3,3-tetramethylbutylperoxy 2-ethylhexanoate, dibutylperoxytrimethyladipate, lauryl peroxide and the like.
• redox initiators include alkali metal sulfites or bisulfites (e.g., ammonium sulfite, ammonium bisulfite, etc.), reducing agents such as ferrous chloride, ferrous sulfate, and ascorbic acid, and alkali metal persulfates.
• alkali metal sulfites or bisulfites e.g., ammonium sulfite, ammonium bisulfite, etc.
• reducing agents such as ferrous chloride, ferrous sulfate, and ascorbic acid
• alkali metal persulfates examples include a combination with an oxidizing agent such as a salt, ammonium persulfate, hydrogen peroxide, or an organic peroxide.
• chain transfer agent In the radical polymerization, if necessary, a known chain transfer agent may be used for the purpose of adjusting physical properties of the polymer such as molecular weight.
• chain transfer agents include mercaptans, thiocarboxylic acids, secondary alcohols such as isopropanol, amines such as dibutylamine, hypophosphites such as sodium hypophosphite, chlorine-containing compounds, and alkylbenzene compounds.
• Mercaptans include, for example, alkyl groups having 2 to 20 carbon atoms such as n-butyl mercaptan, isobutyl mercaptan, n-octyl mercaptan, n-dodecyl mercaptan, sec-butyl mercaptan, tert-butyl mercaptan, tert-dodecyl mercaptan.
• Alkyl mercaptan compounds having a Examples of thiocarboxylic acids include thioglycolic acid and thiomalic acid.
• the amount of the polymerization initiator and the chain transfer agent to be used can be appropriately selected in consideration of the physical properties of the desired polymer (for example, adjustment of molecular weight, etc.).
• Polymerization control methods include an adiabatic polymerization method and a temperature control polymerization method.
• the reaction temperature during polymerization is preferably 30 to 140°C, more preferably 50 to 130°C, still more preferably 70 to 120°C.
• a method of initiating polymerization by irradiation with radiation, electron beams, ultraviolet rays, or the like can also be employed.
• Preferred is a temperature-controlled solution polymerization method.
• Component (B) can be suitably used as a viscosity index improver for lubricating oil compositions.
• the viscosity index improver may consist of component (B), and may be dissolved and diluted in a diluent to be used as a viscosity index improver composition.
• a diluent the solvent that can be used in the polymerization described above can be used, preferably the base oil, and more preferably the base oil (A). These diluents may be used singly or in combination of two or more from those mentioned above.
• the content of the component (B) in the viscosity index improver composition is preferably 5% in 100% by mass of the total viscosity index improver composition. ⁇ 80% by mass, more preferably 10 to 70% by mass, still more preferably 15 to 60% by mass.
• the content of the diluent in the viscosity index improver composition is preferably 20 to 95% by mass, more preferably 30 to 90% by mass, and still more preferably 100% by mass of the total amount of the viscosity index improver composition. is 40 to 85% by mass.
• the total content of the base oil (A) and the component (B) is preferably 70.0% by mass or more based on 100% by mass of the total amount of the lubricating oil composition, from the viewpoint of making it easier to exhibit the effects of the present invention. , more preferably 75.0% by mass or more, still more preferably 80.0% by mass or more, still more preferably 85.0% by mass or more, and preferably 100% by mass or less.
• the total content of the base oil (A) and the component (B) is based on 100% by mass of the total amount of the lubricating oil composition, preferably 70.0 to 100% by mass , more preferably 75.0 to 100% by mass, still more preferably 80.0 to 100% by mass, even more preferably 85.0 to 100% by mass, and may be 100% by mass.
• the lubricating oil composition which is one embodiment of the present invention further contains other components other than the base oil (A) and the component (B), if necessary, within a range that does not impair the effects of the present invention. It may be Other components include base oils other than base oil (A) and lubricating oil additives other than component (B).
• Base oils other than the base oil (A) described above that can be used as other components are not particularly limited as long as they do not impair the effects of the present invention, and conventionally used as base oils for lubricating oils and synthetic Any oil can be appropriately selected and used from among the oils.
• the mineral oil for example, the lubricating oil fraction obtained by vacuum distillation of the atmospheric residue obtained by atmospheric distillation of crude oil is subjected to at least one treatment of solvent deasphalting treatment; solvent extraction or hydrocracking. at least one dewaxing treatment of solvent dewaxing or catalytic dewaxing; hydrorefining treatment; oil produced by converting; and the like.
• Synthetic oils include, for example, polybutene; poly- ⁇ -olefins such as ⁇ -olefin homopolymers and ⁇ -olefin copolymers (e.g., ethylene- ⁇ -olefin copolymers); polyol esters, dibasic acid esters, phosphorus various esters such as acid esters; various ethers such as polyphenyl ethers; polyglycols; alkylbenzenes; alkylnaphthalenes; GTL base oil; and the like.
• GTL base oils are preferred. These base oils may be used singly or in combination of two or more from those mentioned above.
• the base oil contained in the lubricating oil composition is the case where the base oil is used as the solvent used when polymerizing the polymer (B) described above, and the base oil used as the solvent is used as it is.
• the base oil used as the solvent can be regarded as one type of base oil contained in the lubricating oil composition.
• the viscosity index improver composition contains a base oil as the diluent, and the base oil used as the diluent is added as it is to the lubricating oil composition, the diluent
• the base oil used as can also be regarded as one type of base oil contained in the lubricating oil composition.
• the content of these base oils other than base oil (A) can be adjusted as appropriate within a range that does not impair the effects of the present invention.
• the content of each base oil other than the base oil (A) is, for example, the lubricating oil composition Based on the total amount (100% by mass) of, preferably 0.01 to 30.0% by mass, more preferably 0.1 to 25.0% by mass, still more preferably 0.5 to 20.0% by mass, still more It is preferably 1.0 to 15.0% by mass.
• Lubricating oil additives other than the component (B) used as other components include commonly used lubricating oil additives.
• antiwear agent, ashless dispersant, viscosity index improver, extreme pressure agent, pour point depressant, antioxidant, antifoaming agent, surfactant, demulsifier, friction modifier, oiliness improver, anti One or more selected from the group consisting of rust agents and metal deactivators can be used.
• a compound having multiple functions as an additive for lubricating oil for example, a compound having functions as an anti-wear agent and an extreme pressure agent
• These lubricating oil additives other than component (B) may be used alone or in combination of two or more.
• each of these lubricating oil additives other than component (B) can be appropriately adjusted within a range that does not impair the effects of the present invention.
• the content of each of the lubricating oil additives other than the component (B) is , For example, based on the total amount (100% by mass) of the lubricating oil composition, preferably 0.001 to 15.0% by mass, more preferably 0.005 to 10.0% by mass, still more preferably 0.01 to 8 .0% by mass.
• the total content thereof is the total amount of the lubricating oil composition (100% by mass ) basis, preferably more than 0% by mass and 30.0% by mass or less, more preferably 0.001 to 25.0% by mass, still more preferably 0.001 to 20.0% by mass, still more preferably 0.001 ⁇ 15.0% by mass.
• metal-based detergents include organic acid metal salt compounds containing metal atoms selected from alkali metals and alkaline earth metals, and specifically, metal atoms selected from alkali metals and alkaline earth metals. containing metal salicylates, metal phenates, and metal sulfonates.
• alkali metal refers to lithium, sodium, potassium, rubidium, cesium, and francium.
• alkaline earth metal refers to beryllium, magnesium, calcium, strontium, and barium.
• the metal atom contained in the metallic detergent is preferably sodium, calcium, magnesium, or barium, more preferably calcium, from the viewpoint of improving detergency at high temperatures.
• the metal salicylate is preferably a compound represented by the following general formula (1)
• the metal phenate is preferably a compound represented by the following general formula (2)
• the metal sulfonate is preferably a compound represented by the following general formula (3 ) are preferred.
• M is a metal atom selected from alkali metals and alkaline earth metals, preferably sodium, calcium, magnesium or barium, more preferably calcium.
• M E is an alkaline earth metal, preferably calcium, magnesium or barium, more preferably calcium.
• p is the valence of M and is 1 or 2; R 31 and R 32 are each independently a hydrogen atom or a hydrocarbon group having 1 to 18 carbon atoms.
• S represents a sulfur atom.
• q is an integer of 0 or more, preferably an integer of 0-3.
• Hydrocarbon groups that can be selected as R 31 and R 32 include, for example, alkyl groups having 1 to 18 carbon atoms, alkenyl groups having 1 to 18 carbon atoms, cycloalkyl groups having 3 to 18 ring carbon atoms, and ring carbon atoms. Examples include aryl groups having 6 to 18 carbon atoms, alkylaryl groups having 7 to 18 carbon atoms, arylalkyl groups having 7 to 18 carbon atoms, and the like.
• these metallic detergents may be used alone or in combination of two or more.
• one or more selected from calcium salicylate, calcium phenate, and calcium sulfonate is preferable from the viewpoint of improvement of detergency at high temperatures and solubility in base oil.
• these metallic detergents may be neutral salts, basic salts, overbased salts and mixtures thereof.
• the total base number of the metallic detergent is preferably 0 to 600 mgKOH/g.
• the total base number of the metallic detergent is preferably 10 to 600 mgKOH/g, more preferably is 20-500 mg KOH/g.
• base number refers to 7. of JIS K2501:2003 “Petroleum products and lubricating oils—neutralization value test method”. Means the base number by the perchloric acid method measured in accordance with.
• the content of the metallic detergent is preferably based on the total amount (100% by mass) of the lubricating oil composition. is 0.01 to 10.0% by mass.
• the said metallic detergent may be used individually and may use 2 or more types together. A suitable total content when using two or more kinds is also the same as the content described above.
• antiwear agents include sulfur-containing compounds such as zinc dialkyldithiophosphate (ZnDTP), zinc phosphate, disulfides, sulfurized olefins, sulfurized oils and fats, sulfurized esters, thiocarbonates, thiocarbamates, and polysulfides.
• sulfur-containing compounds such as zinc dialkyldithiophosphate (ZnDTP), zinc phosphate, disulfides, sulfurized olefins, sulfurized oils and fats, sulfurized esters, thiocarbonates, thiocarbamates, and polysulfides.
• phosphorus-containing compounds such as phosphites, phosphates, phosphonates, and their amine salts or metal salts; thiophosphites, thiophosphates, thiophosphonates, and these sulfur- and phosphorus-containing antiwear agents such as amine salts or metal salts of Among these, zinc dialkyldithiophosphate (ZnDTP
• the content of the anti-wear agent is based on the total amount (100% by mass) of the lubricating oil composition, preferably It is 0.05 to 5.0% by mass.
• the said anti-wear agent may be used individually and may use 2 or more types together. A suitable total content when using two or more kinds is also the same as the content described above.
• the ashless dispersant includes, for example, succinimide, benzylamine, succinic acid ester, boron-modified products thereof, and the like, and alkenylsuccinimide and boron-modified alkenylsuccinimide are preferred.
• alkenylsuccinimides examples include alkenylsuccinic acid monoimides represented by the following general formula (i) and alkenylsuccinic acid bisimides represented by the following general formula (ii).
• the alkenylsuccinimide is a compound represented by the following general formula (i) or (ii), and one or more selected from alcohols, aldehydes, ketones, alkylphenols, cyclic carbonates, epoxy compounds, organic acids, and the like. may be used as a modified alkenylsuccinimide reacted with.
• boron-modified alkenylsuccinimides examples include boron-modified compounds represented by the following general formula (i) or (ii).
• R A , R A1 and R A2 each independently have a mass average molecular weight (Mw) of 500 to 3,000 (preferably 1,000 to 3,000). It is an alkenyl group, preferably a polybutenyl group or a polyisobutenyl group.
• R B , R B1 and R B2 are each independently an alkylene group having 2 to 5 carbon atoms.
• x1 is an integer of 1-10, preferably an integer of 2-5, more preferably 3 or 4.
• x2 is an integer of 0-10, preferably an integer of 1-4, more preferably 2 or 3.
• the ratio [B/N] of boron atoms and nitrogen atoms constituting the boron-modified alkenylsuccinimide is preferably 0.5 or more, more preferably 0.6 or more, and still more preferably 0.6 or more, from the viewpoint of improving cleanliness. is greater than or equal to 0.8, more preferably greater than or equal to 0.9.
• the content of the ashless dispersant is based on the total amount (100% by mass) of the lubricating oil composition. and preferably 0.1 to 20.0% by mass.
• viscosity index improver examples include polymers other than the component (B) described above, such as PMA-based polymers such as non-dispersed polyalkyl (meth)acrylates and dispersed-type polyalkyl (meth)acrylates; olefin-based copolymers; Copolymers (e.g., ethylene-propylene copolymers, etc.), OCP systems such as dispersed olefin-based copolymers; styrene-based copolymers (e.g., styrene-diene copolymers, styrene-isoprene copolymers, etc.), etc.
• PMA-based polymers such as non-dispersed polyalkyl (meth)acrylates and dispersed-type polyalkyl (meth)acrylates
• olefin-based copolymers Copolymers (e.g., ethylene-propylene copolymers, etc.), OCP systems
• other viscosity index improvers preferably have a weight average molecular weight (Mw) of 5,000 or more and 1,500,000 or less; 000 or more, preferably 1,000,000 or less, more preferably 800,000 or less. In the case of an OCP system, it is preferably 10,000 or more, more preferably 20,000 or more, and preferably 800,000 or less, more preferably 500,000 or less.
• Mw weight average molecular weight
• Mw mass average molecular weight
• the other viscosity index improver is preferably a polyalkyl (meth)acrylate having a PSSI of 30 or less.
• the monomer constituting the polyalkyl (meth) acrylate is an alkyl (meth) acrylate, preferably an alkyl (meth) acrylate having a linear alkyl group having 1 to 18 carbon atoms or a branched alkyl group having 3 to 34 carbon atoms. is.
• the polystyrene-equivalent mass average molecular weight (Mw) of the polyalkyl (meth)acrylate is preferably 10,000 or more and 1,000,000 or less, more preferably 30,000 or more and 500,000 or less.
• the weight average molecular weight of the polyalkyl (meth)acrylate By setting the weight average molecular weight of the polyalkyl (meth)acrylate within this range, the PSSI value can be easily adjusted to 30 or less.
• the said mass average molecular weight (Mw) is measured by the method as described in the Example mentioned later.
• the other viscosity index improver is, for example, the above-described polymer other than the component (B) as a resin component, but as described above, considering the handleability and the solubility in the base oil, the polymer It is often marketed in the state of a viscosity index improver composition in which a resin component containing is diluted with a diluent oil such as a base oil.
• the content of the viscosity index improver is preferably 0.00%, based on the total amount (100% by mass) of the lubricating oil composition, in terms of resin content. 001% by mass or more, more preferably 0.05% by mass or more, still more preferably 0.5% by mass or more, and preferably 10.0% by mass or less, more preferably 5.0% by mass or less, and still more preferably is 2.5% by mass or less.
• extreme pressure agents include sulfur-based extreme-pressure agents such as sulfides, sulfoxides, sulfones and thiophosphinates, halogen-based extreme-pressure agents such as chlorinated hydrocarbons, and organic metal-based extreme-pressure agents. be done. Further, among the antiwear agents described above, a compound having a function as an extreme pressure agent can also be used. These extreme pressure agents may be used alone or in combination of two or more. When the lubricating oil composition of one embodiment of the present invention contains an extreme pressure agent as another component, the content of the extreme pressure agent is based on the total amount (100% by mass) of the lubricating oil composition, preferably It is 0.1 to 10.0% by mass.
• antioxidant any of known antioxidants conventionally used as antioxidants for lubricating oils can be appropriately selected and used. Examples include antioxidants, molybdenum-based antioxidants, sulfur-based antioxidants, phosphorus-based antioxidants, and the like.
• amine-based antioxidants include diphenylamine-based antioxidants such as diphenylamine and alkylated diphenylamine having an alkyl group of 3 to 20 carbon atoms; naphthylamine-based antioxidants such as substituted phenyl- ⁇ -naphthylamine having a group; Phenolic antioxidants include, for example, 2,6-di-tert-butylphenol, 2,6-di-tert-butyl-4-methylphenol, 2,6-di-tert-butyl-4-ethylphenol, Monophenol antioxidants such as isooctyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate agent; diphenol antioxidants such as 4,4'-methylenebis(2,6-di-tert-butylphenol) and 2,2'-m
• Molybdenum-based antioxidants include, for example, molybdenum amine complexes obtained by reacting molybdenum trioxide and/or molybdic acid with an amine compound.
• sulfur-based antioxidants include dilauryl-3,3'-thiodipropionate and the like.
• the phosphorus antioxidant include phosphite and the like.
• a phosphorus-based antioxidant it is preferable that the content of the phosphorus atom satisfies the suitable phosphorus atom content of the lubricating oil composition described later.
• These antioxidants may be contained alone or in any combination of two or more, preferably phenolic antioxidants and/or amine antioxidants.
• the lubricating oil composition of one embodiment of the present invention contains an antioxidant as another component, the content of the antioxidant is based on the total amount (100% by mass) of the lubricating oil composition, preferably 0.05 to 7.0% by mass.
• pour point depressant examples include ethylene-vinyl acetate copolymers, condensates of chlorinated paraffin and naphthalene, condensates of chlorinated paraffin and phenol, polymethacrylates (PMA; polyalkyl (meth) acrylate, etc.), polyvinyl acetate, polybutene, polyalkylstyrene, etc., and polymethacrylates are preferably used. These pour point depressants may be used alone or in combination of two or more.
• the content of the pour point depressant is based on the total amount (100% by mass) of the lubricating oil composition, It is preferably 0.01 to 10.0% by mass.
• Antifoaming agents include, for example, silicone oils such as dimethylpolysiloxane, fluorosilicone oils, and fluoroalkyl ethers. These antifoaming agents may be used alone or in combination of two or more.
• the content of the antifoaming agent is based on the total amount (100% by mass) of the lubricating oil composition, preferably It is 0.05 to 5.0% by mass.
• surfactant or demulsifiers include polyalkylene glycol-based nonionic surfactants such as polyoxyethylene alkyl ethers, polyoxyethylene alkylphenyl ethers and polyoxyethylene alkylnaphthyl ethers. These surfactants or demulsifiers may be contained alone or in any combination of two or more.
• the content of the surfactant or demulsifier is each independently the total amount of the lubricating oil composition (100% by mass), preferably 0.01 to 3.0% by mass.
• friction modifiers examples include molybdenum-based friction modifiers such as molybdenum dithiocarbamate (MoDTC), molybdenum dithiophosphate (MoDTP), and amine salts of molybdic acid; Ashless friction modifiers such as fatty amines, fatty acid esters, fatty acid amides, fatty acids, fatty alcohols, and fatty ethers having at least one; , phosphate amine salts and the like.
• MoDTC molybdenum dithiocarbamate
• MoDTP molybdenum dithiophosphate
• Ashless friction modifiers such as fatty amines, fatty acid esters, fatty acid amides, fatty acids, fatty alcohols, and fatty ethers having at least one
• phosphate amine salts and the like are examples of friction modifiers.
• Oiliness improvers include aliphatic saturated or unsaturated monocarboxylic acids such as stearic acid and oleic acid; polymerized fatty acids such as dimer acid and hydrogenated dimer acid; hydroxy fatty acids such as ricinoleic acid and 12-hydroxystearic acid; lauryl alcohol , aliphatic saturated or unsaturated monoalcohols such as oleyl alcohol; aliphatic saturated or unsaturated monoamines such as stearylamine and oleylamine; aliphatic saturated or unsaturated monocarboxylic acid amides such as lauric acid amide and oleic acid amide; glycerin, partial esters of polyhydric alcohols such as sorbitol and aliphatic saturated or unsaturated monocarboxylic acids; When the lubricating oil composition of one embodiment of the present invention contains an oiliness improver as another component, the content of the oiliness improver is based on the total amount (100% by mass)
• ⁇ anti-rust ⁇ Rust inhibitors include, for example, fatty acids, alkenylsuccinic acid half esters, fatty acid soaps, alkylsulfonates, polyhydric alcohol fatty acid esters, fatty acid amines, paraffin oxide, and alkylpolyoxyethylene ethers.
• the content of the rust inhibitor is based on the total amount (100% by mass) of the lubricating oil composition, preferably It is 0.01 to 3.0% by mass.
• metal deactivators include benzotriazole-based compounds, tolyltriazole-based compounds, thiadiazole-based compounds, imidazole-based compounds, and pyrimidine-based compounds.
• the content of the metal deactivator is based on the total amount (100% by mass) of the lubricating oil composition. and preferably 0.01 to 5.0% by mass.
• the 100° C. kinematic viscosity of the lubricating oil composition is preferably 1.0 to 15.0 mm 2 /s, more preferably 4.0 to 15.0 mm 2 /s, still more preferably 5.0 to 12.0 mm 2 /s, more preferably 6.0 to 10.0 mm 2 /s.
• the 40° C. kinematic viscosity of the lubricating oil composition is preferably 10.0 to 40.0 mm 2 /s, more preferably 15.0 to 30.0 mm 2 /s, still more preferably 20.0 to 25.0 mm 2 /s. 0 mm 2 /s.
• the viscosity index of the lubricating oil composition is preferably 300 or higher, more preferably 305 or higher, still more preferably 310 or higher, and even more preferably 315 or higher.
• Each of the above kinematic viscosities and viscosity indices is a value measured by the method described in the examples below.
• a method for producing a lubricating oil composition which is one embodiment of the present invention, comprises a base oil (A) that satisfies the following requirements (A-1) to (A-4), the following requirements (B-1) and (B- A viscosity index improver (B) that satisfies 2) is blended.
• a base oil (A) that satisfies the following requirements (A-1) to (A-4), the following requirements (B-1) and (B- A viscosity index improver (B) that satisfies 2) is blended.
• A-1) The kinematic viscosity at 100°C is 2.0 mm 2 /s or more and less than 7.0 mm 2 /s.
• Requirement (A-2) The viscosity index is 100 or more.
• ⁇ Requirement (A-3) The content of cycloparaffins measured in accordance with ASTM D 2786-91 (2016) is 35.0% by volume or less based on 100% by volume of the total amount of base oil (A) be.
• ⁇ Requirement (A-4) % CA is less than 1.0.
• the base oil (A) may further contain other components other than the component (B).
• the base oil (A), component (B), and other components are the same as those described for the lubricating oil composition, and the preferred aspects of each are also the same. Since the oil composition is also as described above, the description thereof is omitted.
• the base oil (A), component (B), and other components added as necessary may be mixed by any method, and the method is not limited.
• the lubricating oil composition of one embodiment of the present invention has a high viscosity index. Therefore, the lubricating oil composition, which is one embodiment of the present invention, includes, for example, gear oil (manual transmission oil, differential oil, etc.), automatic transmission oil (automatic transmission oil, etc.), continuously variable transmission oil (belt CVT oil, drive system oils such as toroidal CVT oil, power steering oil, shock absorber oil, and electric motor oil; oil for internal combustion engines (engines) such as gasoline engine, diesel engine, and gas engine oil; hydraulic oil; Turbine oil; compressor oil; fluid bearing oil; rolling bearing oil; can be preferably used as.
• gear oil manual transmission oil, differential oil, etc.
• automatic transmission oil automatic transmission oil, etc.
• continuously variable transmission oil continuously variable transmission oil
• drive system oils such as toroidal CVT oil, power steering oil, shock absorber oil, and electric motor oil
• oil for internal combustion engines (engines) such as gasoline engine, diesel engine, and gas engine oil
• hydraulic oil Turbine oil
• compressor oil fluid
• the lubricating oil composition which is one embodiment of the present invention is more suitable as a lubricating oil composition used in a wider temperature range due to the characteristic that it has a high viscosity index.
• automobiles such as four-wheeled vehicles, transportation equipment such as trains, ships and airplanes, generators, gears mounted on various machine tools, automatic transmissions, continuously variable transmissions, shock absorbers, power steering, electric motors lubricating oil for drive system equipment such as; lubricating oil for internal combustion engines such as gasoline engine, diesel engine and gas engine;
• the lubricating method using the lubricating oil composition preferably includes filling the lubricating oil composition into an apparatus used in each of the applications described above. , a method of lubricating between each part related to each device. And, as a lubricating method using the lubricating oil composition which is one embodiment of the present invention, it is more preferable to use the lubricating oil composition, for example, automobiles such as two-wheeled vehicles and four-wheeled vehicles, trains, ships, and airplanes.
• Driving equipment such as gears, automatic transmissions, continuously variable transmissions, shock absorbers, power steering, and electric motors mounted on transportation equipment, generators, and various machine tools; gasoline engines, diesel engines, gas engines, etc. internal combustion engine; and the like, and lubricate between each part related to the drive train equipment or between each part related to the internal combustion engine.
• Another embodiment of the present invention includes a drive system device using the lubricating oil composition of one embodiment of the present invention, preferably a drive system device using the lubricating oil composition as a drive system oil.
• the drive system equipment include automobiles such as two-wheeled vehicles and four-wheeled vehicles, transportation equipment such as trains, ships, and airplanes, generators, and gears mounted on various machine tools, automatic transmissions, and continuously variable transmissions. machine, shock absorber, power steering, electric motor, etc.
• Another embodiment of the present invention includes an internal combustion engine using the lubricating oil composition of one embodiment of the present invention, preferably an internal combustion engine (engine) using the lubricating oil composition as an engine oil.
• the internal combustion engine include gasoline engines, diesel engines, gas engines, etc., which are mounted on automobiles such as two-wheeled vehicles and four-wheeled vehicles, trains, ships, and transportation equipment such as airplanes.
• each raw material used in each example and each comparative example and each physical property of the lubricating oil composition of each example and each comparative example were obtained according to the following procedures.
• ⁇ Kinematic viscosity 40°C kinematic viscosity, 100°C kinematic viscosity
• ⁇ Viscosity index It is a value calculated according to JIS K2283:2000.
• Mass average molecular weight (Mw), number average molecular weight (Mn), Mw/Mn of component (B) was obtained by gel permeation chromatography (GPC) according to the following measurement methods.
• Solvent deuterated chloroform
• Reference material tetramethylsilane (TMS) Resonance frequency: 100MHz
• Measurement mode Decoupling method with gate Accumulation times: 2,000 to 5,000 Pulse delay time: 25s Pulse width: 9.25 ⁇ s x-angle: 90°
• Examples 1 to 5, Comparative Examples 1 to 8 So that the composition of the lubricating oil composition shown in Table 3 below (Examples 1 to 5 and Comparative Examples 1 to 5) and Table 4 (Examples 1 and 4 and Comparative Examples 6 to 8), After preparing the lubricating oil composition by blending the polymer with the base oil, the lubricating oil composition of each example and each comparative example was evaluated according to the evaluation method described above. The results obtained are shown in Tables 3 and 4 below. In the lubricating oil composition of each example and comparative example, the formulation of each component was adjusted so that the kinematic viscosity at 100° C. was about 7.5 mm 2 /s.
• the lubricating oil composition is prepared and used so as to exhibit a specific kinematic viscosity at the temperature at which it is assumed to be used. This is because it is necessary to compare Therefore, the comparison was not made by unifying the content of the polymer blended in the base oil, but by unifying the 100° C. kinematic viscosity of the obtained lubricating oil composition.
• each component used in the following examples and comparative examples represents the following compounds.
• ⁇ Base oil 2: Feedstock oil containing slack wax and bottom oil obtained by hydrocracking heavy fuel oil (slack wax/bottom oil 30/70 (mass ratio)) is hydroisomerized Mineral oil obtained by performing wax treatment and then hydrofinishing treatment, followed by distillation under reduced pressure to collect fractions having kinematic viscosities at 100 ° C. shown in Table 1 below. Details of the properties of No. 2 are shown in Table 1 below.
• C12-18 straight-chain alkyl methacrylate includes alkyl methacrylates having a straight-chain alkyl group with 12 to 14 carbon atoms in the side chain that overlaps with "C12-14 straight-chain alkyl methacrylate”.
• the lubricating oil compositions of Examples 1 to 5 consist of base oil 1, which is base oil (A), and polymer (B) that satisfies the requirements (B-1) and (B-2). and therefore contains the same base oil 1, but the requirements for the polymer (B), especially the lubricating oils of Comparative Examples 1 to 5 containing a polymer that does not satisfy the requirement (B-2) It was confirmed that the viscosity index was improved compared to the composition.
• the lubricating oil compositions of Examples 1 and 4 consisted of a base oil 1, which is the base oil (A), and a polymer satisfying the requirements (B-1) and (B-2) ( B), so each contains the same polymer (B), but as a base oil, a base oil that does not satisfy the requirements for base oil (A), especially the above requirement (A-3) It was confirmed that the viscosity index was improved over the lubricating oil compositions of Comparative Examples 6 and 7 containing 2.
• the lubricating oil composition of Comparative Example 8 contains a base oil 2 that does not satisfy the requirements for the base oil (A) and a polymer E1 that does not satisfy the requirements for the polymer (B). It was confirmed that the viscosity index was significantly lower than that of the lubricating oil composition of the example.
• the lubricating oil composition of one embodiment of the present invention has a higher viscosity index than conventional lubricating oil compositions. Therefore, the lubricating oil composition which is one embodiment of the present invention is suitably used as a lubricating oil composition used in a wide temperature range, such as drive system oil and lubricating oil for internal combustion engines, as described above. can.

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