JP5196726B2 - Lubricating oil composition for drive transmission device - Google Patents

Description

  The present invention relates to a lubricating oil composition for a drive transmission device.

  In recent years, energy savings for automobiles, construction machinery, agricultural machinery, etc., that is, fuel savings has become an urgent task in response to environmental issues such as reduction of carbon dioxide emissions, and drive transmission for transmissions, final reduction gears, etc. Devices are strongly required to contribute to energy saving.

  As a means for reducing fuel consumption in the above drive transmission device, there is a method of reducing the agitation resistance and frictional resistance on the sliding surface by reducing the viscosity of the lubricating oil. For example, among automatic transmissions, automatic transmissions for automobiles and continuously variable transmissions have torque converters, wet clutches, gear bearing mechanisms, oil pumps, heavy pressure control mechanisms, etc., and manual transmissions and final reduction gears have gear bearings. It has a mechanism, and by reducing the viscosity of the lubricating oil used for these to reduce the stirring resistance and frictional resistance, it is possible to improve power transmission efficiency and save fuel.

  However, lowering the viscosity of the lubricating oil is accompanied by a decrease in lubricity (abrasion resistance, anti-seizure property, fatigue life, etc.), which may cause problems in the transmission and the like. In addition, if a phosphorus-based extreme pressure agent is added in order to ensure the wear resistance of the lubricant whose viscosity has been reduced, the fatigue life is significantly deteriorated. In addition, sulfur-based extreme pressure agents are effective in improving fatigue life, but it is generally known that the influence of the viscosity of the lubricating base oil is greater in the low viscosity lubricating base oil than in the additive. .

Therefore, in order to reduce the viscosity of the lubricating oil for the purpose of reducing fuel consumption, as a means for ensuring lubricity, a combination of a phosphorus extreme pressure agent and a sulfur extreme pressure agent blended in the lubricating oil base oil is used. Optimization has been studied (see, for example, Patent Documents 1 and 2).
Japanese Patent Application Laid-Open No. 2004-262979 JP 2004-262980 A

  However, there is room for improvement in order to meet the increasing demand for fuel saving even with the conventional lubricating oil for drive transmission devices. That is, according to the study by the present inventors, even if the lubricating base oil used in the conventional lubricating oil for drive transmission devices is what is called a high performance base oil, its own lubricity and viscosity. -Temperature characteristics and thermal / oxidation stability are not always sufficient. Therefore, the method based on the optimization of the additive formulation as described in Patent Documents 1 and 2 described above reduces the viscosity within a range that does not impair the properties such as wear resistance, anti-seizure properties, and fatigue life. There is a limit. Furthermore, the conventional lubricating oil is not sufficient in terms of shear stability, and when a lubricating oil containing the lubricating base oil is used for a long period of time, the viscosity may decrease and the lubricating property may be impaired.

  The present invention has been made in view of such circumstances, and its purpose is to achieve high levels of wear resistance, anti-seizure properties and fatigue life over a long period of time even when the viscosity is lowered. Another object of the present invention is to provide a lubricating oil composition that can achieve both fuel saving and durability of the drive transmission device.

  In order to solve the above-described problems, the present invention provides a lubricating base oil containing 90% by mass or more of a saturated component and a cyclic saturated component in the saturated component of 10 to 40% by mass, a poly (meta And) a lubricant composition for a drive transmission device, comprising an acrylate viscosity index improver and a phosphorus-containing compound.

  Since the lubricating base oil contained in the lubricating oil composition for a drive transmission device according to the present invention satisfies the above conditions, the content of the saturated component and the ratio of the cyclic saturated component in the saturated component satisfy the above conditions, the viscosity grade is Compared with conventional lubricating base oils of the same level, they are excellent in viscosity-temperature characteristics, thermal / oxidative stability, and friction characteristics. Furthermore, the lubricating base oil, when an additive is blended, can exhibit its function at a higher level while stably dissolving and holding the additive. Then, a lubricating base oil having such excellent characteristics is added to a poly (meth) acrylate viscosity index improver (hereinafter referred to as “component (A)” in some cases) and a phosphorus-containing compound (hereinafter referred to as “( Even if the viscosity is reduced by incorporating B) component "), the effect of improving wear resistance, friction characteristics, seizure resistance and fatigue life by these synergistic effects, and shear stability The effect of improving sex can be maximized. Therefore, the fuel transmission performance and durability of the drive transmission device can both be achieved by the lubricating oil composition for the drive transmission device of the present invention.

  Furthermore, in the case of the conventional lubricating base oil, it has been difficult to achieve both the improvement of the low-temperature viscosity characteristics and the prevention of volatilization. However, according to the lubricating base oil of the present invention, the low-temperature viscosity characteristics and volatilization prevention Both can be achieved at a high level and in a well-balanced manner. Therefore, the lubricating oil composition for a drive device of the present invention is useful in terms of improving startability at low temperatures in addition to achieving both fuel saving and durability of the drive transmission device.

The present invention also includes a lubricant base oil that satisfies the condition represented by the following formula (1), a poly (meth) acrylate viscosity index improver, and a phosphorus-containing compound. A lubricating oil composition for a device is provided.
1.440 ≦ n ₂₀ −0.002 × kv100 ≦ 1.453 (1)
[Wherein n ₂₀ represents the refractive index of the lubricating base oil at 20 ° C., and kv100 represents the kinematic viscosity (mm ² / s) of the lubricating base oil at 100 ° C. ]

  The lubricating base oil that satisfies the condition represented by the above formula (1) is also excellent in viscosity-temperature characteristics, thermal / oxidative stability, and friction characteristics, and when an additive is blended, While the additive is stably dissolved and held, the function of the additive can be expressed at a higher level. Therefore, a lubricating oil composition for a drive transmission device comprising a lubricating base oil that satisfies the condition represented by the above formula (1), the specific poly (meth) acrylate viscosity index improver, and a phosphorus-containing compound. As a result, it is possible to achieve both fuel saving and durability of the drive transmission device, and further improve the startability at low temperatures.

  According to the present invention, a lubricating oil composition for a drive transmission device capable of achieving a high level of wear resistance, anti-seizure property and fatigue life over a long period of time even when the viscosity is lowered is realized. The By using the lubricating oil composition for a drive transmission device of the present invention, it is possible to achieve both fuel saving performance and durability of the drive transmission device, and further to improve startability at low temperatures. Become.

  Hereinafter, preferred embodiments of the present invention will be described in detail.

In the present invention, a lubricating base oil that satisfies at least one of the following conditions (a) or (b) (hereinafter simply referred to as “the lubricating base oil according to the present invention”) is used. The lubricating base oil according to the present invention only needs to satisfy at least one of the conditions (a) and (b), but it is more preferable to satisfy both the conditions (a) and (b).
(A) It contains 90 % by mass or more of the saturated component, and the ratio of the cyclic saturated component in the saturated component is 10 to 40 % by mass.
(B) The condition expressed by the following formula (1) is satisfied.
1.440 ≦ n ₂₀ −0.002 × kv100 ≦ 1.453 (1)
[Wherein n ₂₀ represents the refractive index of the lubricating base oil at 20 ° C., and kv100 represents the kinematic viscosity (mm ² / s) of the lubricating base oil at 100 ° C. ]

  The lubricating base oil according to the present invention is not particularly limited as long as it satisfies at least one of the above conditions (a) and (b). Specifically, a lubricating oil fraction obtained by atmospheric distillation and / or vacuum distillation of crude oil is subjected to solvent removal, solvent extraction, hydrocracking, solvent dewaxing, catalytic dewaxing, hydrorefining, sulfuric acid Of the paraffinic mineral oil, or the normal paraffinic base oil, the isoparaffinic base oil, etc. purified by combining one or more of the purification treatments such as washing and clay treatment alone or in combination of the above conditions (a) or Those satisfying at least one of (b) are mentioned. These lubricating base oils may be used alone or in combination of two or more.

As a preferable example of the lubricating base oil according to the present invention, the following base oils (1) to (8) are used as raw materials, and the raw oil and / or the lubricating oil fraction recovered from the raw oil is determined in advance. The base oil obtained by refine | purifying by the refining method of this, and collect | recovering lubricating oil fractions can be mentioned.
(1) Distilled oil by atmospheric distillation of paraffinic crude oil and / or mixed base crude oil (2) Distilled oil by vacuum distillation of atmospheric distillation residue of paraffinic crude oil and / or mixed base crude oil ( WVGO)
(3) Wax (such as slack wax) obtained by the lubricant dewaxing process and / or synthetic wax (Fischer-Tropsch wax, GTL wax, etc.) obtained by the gas-liquid (GTL) process, etc.
(4) One or two or more mixed oils selected from base oils (1) to (3) and / or mild hydrocracking treatment oils of the mixed oils (5) selected from base oils (1) to (4) 2 or more kinds of mixed oils (6) Base oil (1), (2), (3), (4) or (5) debris oil (DAO)
(7) Mild hydrocracking treatment oil (MHC) of base oil (6)
(8) Two or more mixed oils selected from base oils (1) to (7).

  The above-mentioned predetermined purification methods include hydrorefining such as hydrocracking and hydrofinishing; solvent refining such as furfural solvent extraction; dewaxing such as solvent dewaxing and catalytic dewaxing; acid clay and activated clay White clay purification; chemical (acid or alkali) cleaning such as sulfuric acid cleaning and caustic soda cleaning is preferable. In the present invention, one of these purification methods may be performed alone, or two or more may be combined. Moreover, when combining 2 or more types of purification methods, the order in particular is not restrict | limited, It can select suitably.

Furthermore, the lubricating base oil according to the present invention is obtained by subjecting a base oil selected from the above base oils (1) to (8) or a lubricating oil fraction recovered from the base oil to a predetermined treatment. The following base oil (9) or (10) is particularly preferred.
(9) The base oil selected from the base oils (1) to (8) or the lubricating oil fraction recovered from the base oil is hydrocracked and recovered from the product or the product by distillation or the like. Hydrocracked mineral oil obtained by performing dewaxing treatment such as solvent dewaxing or catalytic dewaxing on the lubricating oil fraction, or distillation after the dewaxing treatment (10) The above base oils (1) to (8) ) Or a lubricating oil fraction recovered from the base oil is hydroisomerized, and the product or the lubricating oil fraction recovered from the product by distillation or the like is subjected to solvent dewaxing or catalytic dewaxing. Hydroisomerized mineral oil obtained by performing a dewaxing process such as or by distillation after the dewaxing process.

  Moreover, when obtaining the lubricating base oil of (9) or (10) above, a solvent refining treatment and / or a hydrofinishing treatment step may be further provided as necessary at a convenient step.

  The catalyst used for the hydrocracking / hydroisomerization is not particularly limited, but a composite oxide having cracking activity (for example, silica alumina, alumina boria, silica zirconia, etc.) or one of the composite oxides. Hydrogenolysis with a combination of the above combined with a binder and supporting a metal having hydrogenation ability (for example, one or more metals such as Group VIa metal or Group VIII metal in the periodic table) Hydroisomerization catalyst in which a catalyst or a support containing zeolite (for example, ZSM-5, zeolite beta, SAPO-11, etc.) is loaded with a metal having a hydrogenation ability containing at least one of Group VIII metals Are preferably used. The hydrocracking catalyst and the hydroisomerization catalyst may be used in combination by stacking or mixing.

  The reaction conditions in the hydrocracking / hydroisomerization are not particularly limited, but the hydrogen partial pressure is 0.1 to 20 MPa, the average reaction temperature is 150 to 450 ° C., the LHSV is 0.1 to 3.0 hr-1, and the hydrogen / oil ratio. It is preferable to set it as 50-20000 scf / b.

  Preferable examples of the method for producing a lubricating base oil according to the present invention include production method A shown below.

That is, the manufacturing method A according to the present invention includes:
NH ₃ to the carrier desorption of the fraction of the NH ₃ is 80% or less at 300 to 800 ° C. relative to the total desorption of NH ₃ in the desorption temperature dependence evaluation, at least one of the periodic table Group VIa metals And a first step of preparing a hydrocracking catalyst on which at least one of the Group VIII metals is supported,
In the presence of a hydrocracking catalyst, a feed oil containing 50% by volume or more of slack wax, hydrogen partial pressure 0.1-14 MPa, average reaction temperature 230-430 ° C., LHSV 0.3-3.0 hr ⁻¹ , hydrogen oil ratio A second step of hydrocracking at 50-14000 scf / b;
A third step of obtaining a lubricating oil fraction by distilling and separating the cracked product oil obtained in the second step;
And a fourth step of dewaxing the lubricating oil fraction obtained in the third step.

  Hereinafter, the production method A will be described in detail.

(Raw oil)
In the production method A, a raw material oil containing 50% by volume or more of slack wax is used. The “raw oil containing 50% by volume or more of slack wax” as used in the present invention is a mixed oil of a raw oil consisting only of slack wax, slack wax and other raw material oil, and 50 volumes of slack wax. % And both raw material oils containing at least% are included.

Slack wax is a wax-containing component by-produced in the solvent dewaxing step when producing a lubricating base oil from a paraffinic lubricating oil fraction. In the present invention, the slack wax is obtained by further deoiling the wax-containing component. Included in wax. The main components of slack wax are n-paraffins and branched paraffins (isoparaffins) with few side chains, and are low in naphthenes and aromatics. The kinematic viscosity of the slack wax used for the preparation of the raw material oil can be appropriately selected according to the kinematic viscosity of the target lubricating base oil, but a low viscosity base oil is produced as the lubricating base oil according to the present invention. For this purpose, a relatively low viscosity slack wax having a kinematic viscosity at 100 ° C. of about ² to 25 mm ² / s, preferably about 2.5 to ²⁰ mm ² / s, more preferably about 3 to 15 mm ² / s. desirable. Moreover, although the other property of slack wax is also arbitrary, melting | fusing point becomes like this. Preferably it is 35-80 degreeC, More preferably, it is 45-70 degreeC, More preferably, it is 50-60 degreeC. The oil content of the slack wax is preferably 60% by mass or less, more preferably 50% by mass or less, further preferably 25% by mass or less, particularly preferably 10% by mass or less, and preferably 0.5% by mass. As mentioned above, More preferably, it is 1 mass% or more. The sulfur content of the slack wax is preferably 1% by mass or less, more preferably 0.5% by mass or less, and preferably 0.001% by mass or more.

  Here, the oil content of the fully deoiled slack wax (hereinafter referred to as “slack wax A”) is preferably 0.5 to 10% by mass, more preferably 1 to 8% by mass. The sulfur content of the slack wax A is preferably 0.001 to 0.2% by mass, more preferably 0.01 to 0.15% by mass, and still more preferably 0.05 to 0.12% by mass. On the other hand, the oil content of slack wax (hereinafter referred to as “slack wax B”) that is not deoiled or insufficiently deoiled is preferably 10 to 60% by mass, more preferably 12 to 50% by mass. More preferably, it is 15 to 25% by mass. The sulfur content of the slack wax B is preferably 0.05 to 1% by mass, more preferably 0.1 to 0.5% by mass, and still more preferably 0.15 to 0.25% by mass.

  In the production method A, by using the slack wax A as a raw material, the lubricating base oil according to the present invention satisfying at least one of the conditions (a) and (b) can be suitably obtained. In addition, according to the above production method A, even if slack wax B having a relatively high oil content and sulfur content, and relatively poor and inexpensive is used as a raw material, the viscosity index is high, and low temperature characteristics and thermal / oxidative stability are excellent. In addition, a lubricating base oil with high added value can be obtained.

  When the raw material oil is a mixed oil of slack wax and other raw material oil, the other raw material oil is not particularly limited as long as the ratio of slack wax to the total amount of the mixed oil is 50% by volume or more. A heavy oil-distilled distillate and / or a mixed oil of vacuum-distilled distillate is preferably used.

  Further, when the raw material oil is a mixed oil of slack wax and another raw material oil, the ratio of slack wax in the mixed oil is more preferably 70% by volume or more from the viewpoint of producing a base oil having a high viscosity index. 75% by volume or more is even more preferable. When the ratio is less than 50% by volume, the oil base such as aromatics and naphthenes in the obtained lubricating base oil tends to increase and the viscosity index of the lubricating base oil tends to decrease.

  On the other hand, the heavy atmospheric distillation distillate and / or vacuum distillation distillate of crude oil used in combination with slack wax has a distillation temperature of 300 to 570 ° C. in order to keep the viscosity index of the lubricating base oil produced high. A fraction having a distillate component of 60% by volume or more in the range is preferable.

(Hydrocracking catalyst)
In the manufacturing method A, the carrier desorption of the fraction of the NH ₃ is 80% or less at 300 to 800 ° C. relative to the total desorption of NH ₃ in the NH ₃ desorption temperature dependence evaluation, periodic table Group VIa A hydrocracking catalyst in which at least one of the metals and at least one of the Group VIII metals is supported is used.

Here, “NH ₃ desorption temperature dependency evaluation” refers to literature (Sawa M., Niwa M., Murakami Y., Zeolites 1990, 10, 532, Karge HG, Dondur V., J. Phys. Chem., 1990, 94, 765, etc.) and is performed as follows. First, the catalyst carrier is pretreated at a temperature of 400 ° C. or higher for 30 minutes or more under a nitrogen stream to remove adsorbed molecules, and then adsorbs NH ₃ at 100 ° C. until saturation. Then, the catalyst support to 100 to 800 ° C. 10 ° C. / min was heated by the following heating rate desorbed NH _3, to monitor the NH ₃ separated at every predetermined temperature by desorption. Then, the fraction of the NH ₃ desorption amount at 300 ° C. to 800 ° C. with respect to the total NH ₃ desorption amount (desorption amount at 100 to 800 ° C.) is obtained.

The catalyst carrier used in the production method A are those desorption of the fraction of NH ₃ at 300 to 800 ° C. relative to the total desorption of NH ₃ in the NH ₃ desorption temperature dependence evaluation of the following 80% , Preferably 70% or less, more preferably 60% or less. By constituting a hydrocracking catalyst using such a carrier, the acid properties that govern the cracking activity are sufficiently suppressed, so that the high molecular weight n-paraffin derived from slack wax or the like in the raw oil by hydrocracking. The production of isoparaffin by decomposition isomerization can be performed efficiently and reliably, and excessive decomposition of the produced isoparaffin compound can be sufficiently suppressed. As a result, a sufficient amount of molecules having a moderately branched chemical structure and a high viscosity index can be provided in an appropriate molecular weight range.

  As such a support, a binary oxide which is amorphous and has an acid property is preferable. For example, it is exemplified in the literature ("Metal oxide and its catalytic action", Tetsuro Shimizu, Kodansha, 1978). And binary oxides.

Among them, an amorphous composite oxide which is an acid composed of two kinds of oxides of elements selected from Al, B, Ba, Bi, Cd, Ga, La, Mg, Si, Ti, W, Y, Zn and Zr. It is preferable to contain a property binary oxide. By adjusting the ratio of each oxide of these acid property binary oxides, a support having an acid property suitable for this purpose can be obtained in the NH ₃ adsorption / desorption evaluation. In addition, the acid property binary oxide constituting the carrier may be one of the above or a mixture of two or more. Further, the carrier may be composed of the above-mentioned acid property binary oxide, or may be a carrier obtained by binding the acid property binary oxide with a binder.

  Further, the carrier is amorphous silica / alumina, amorphous silica / zirconia, amorphous silica / magnesia, amorphous silica / titania, amorphous silica / boria, amorphous alumina / zirconia, amorphous alumina / magnesia, amorphous At least one selected from alumina / titania, amorphous alumina / boria, amorphous zirconia / magnesia, amorphous zirconia / titania, amorphous zirconia / boria, amorphous magnesia / titania, amorphous magnesia / boria and amorphous titania / boria It is preferable to contain two kinds of acid nature binary oxides. The acidic binary oxide constituting the carrier may be one of the above or a mixture of two or more. Further, the carrier may be composed of the above-mentioned acid property binary oxide, or may be a carrier obtained by binding the acid property binary oxide with a binder. The binder is not particularly limited as long as it is generally used for catalyst preparation, but is preferably selected from silica, alumina, magnesia, titania, zirconia, clay, or a mixture thereof.

  In the production method A described above, the carrier is composed of at least one of group VIa metals (molybdenum, chromium, tungsten, etc.) of the periodic table and group VIII metal (nickel, cobalt, palladium, platinum, etc.). At least one of them is supported to form a hydrocracking catalyst. These metals are responsible for hydrogenation ability, terminate the reaction in which the paraffinic compound is decomposed or branched by the acidic carrier, and play an important role in producing isoparaffin having an appropriate molecular weight and branched structure.

  As the amount of metal supported in the hydrocracking catalyst, the supported amount of Group VIa metal is 5 to 30% by mass per one type of metal, and the supported amount of Group VIII metal is 0.2 to 10% by mass per one type of metal. % Is preferred.

  Further, in the hydrocracking catalyst used in the production method A, molybdenum is contained in the range of 5 to 30% by mass as one or more metals of the Group VIa metal, and one or more of the Group VIII metals is contained. More preferably, the metal contains nickel in the range of 0.2 to 10% by mass.

  The hydrocracking catalyst composed of the above support and one or more metals of Group VIa metal and one or more metals of Group VIII metal is preferably used for hydrocracking in a sulfurized state. The sulfurization treatment can be performed by a known method.

(Hydrolysis process)
In the production method A, a raw material oil containing 50% by volume or more of slack wax in the presence of the hydrocracking catalyst has a hydrogen partial pressure of 0.1 to 14 MPa, preferably 1 to 14 MPa, more preferably 2 to 2. 7 MPa; average reaction temperature of 230 to 430 ° C., preferably 330 to 400 ° C., more preferably 350 to 390 ° C .; LHSV of 0.3 to 3.0 hr ⁻¹ , preferably 0.5 to 2.0 hr ⁻¹ ; Hydrogenolysis is performed at a hydrogen oil ratio of 50 to 14,000 scf / b, preferably 100 to 5000 scf / b.

  In such a hydrocracking process, isomerization to isoparaffin progresses in the process of cracking n-paraffin derived from slack wax in the raw material oil, thereby producing an isoparaffin component having a low pour point and a high viscosity index. At the same time, it breaks down aromatic compounds, which are inhibitors of high viscosity index contained in the feedstock, into monocyclic aromatic compounds, naphthene compounds and paraffin compounds, and inhibits high viscosity index. The polycyclic naphthene compound as a factor can be decomposed into a monocyclic naphthene compound or a paraffin compound. From the viewpoint of increasing the viscosity index, it is preferable that the raw material oil contains fewer compounds having a high boiling point and a low viscosity index.

Further, the decomposition rate for evaluating the progress of the reaction is expressed by the following formula:
(Decomposition rate (volume%)) = 100− (ratio of the fraction having a boiling point of 360 ° C. or more in the product (volume%))
In this way, the decomposition rate is preferably 3 to 90% by volume. When the decomposition rate is less than 3% by volume, isoparaffins are generated by decomposition and isomerization of high-molecular-weight n-paraffins having a high pour point contained in the feedstock, and hydrocracking of aromatics and polycyclic naphthenes with poor viscosity index. When the decomposition rate exceeds 90% by volume, the yield of the lubricating oil fraction decreases, which is not preferable.

(Distillation separation process)
Next, the lubricating oil fraction is distilled and separated from the cracked product oil obtained by the hydrocracking step. At this time, a fuel oil fraction may be obtained as a light component.

  The fuel oil fraction is a fraction obtained as a result of sufficient desulfurization and denitrogenation, and sufficient aromatic hydrogenation. Among these, the naphtha fraction has a high isoparaffin content, the kerosene fraction has a high smoke point, and the light oil fraction has a high cetane number.

  On the other hand, when hydrocracking in the lubricating oil fraction is insufficient, a part of it may be subjected to the hydrocracking process again. Further, in order to obtain a lubricating oil fraction having a desired kinematic viscosity, the lubricating oil fraction may be further distilled under reduced pressure. This vacuum distillation separation may be performed after the dewaxing treatment described below.

  In the evaporative separation step, a lubricant base oil called 70 Pale, SAE10, or SAE20 can be suitably obtained by distilling the cracked product oil obtained in the hydrocracking step under reduced pressure.

  A system that uses slack wax with lower viscosity as the feedstock is suitable for producing a large amount of 70 Pale and 10 SAE fractions, and a system that uses slack wax with a high viscosity within the above range as feedstock produces a lot of SAE20. Suitable for doing. However, even if a high-viscosity slack wax is used, conditions for generating a considerable amount of 70 Pale and SAE 10 can be selected depending on the progress of the decomposition reaction.

(Dewaxing process)
In the above-described distillation separation step, since the lubricating oil fraction fractionated from the cracked product oil has a high pour point, it is dewaxed to obtain a lubricating base oil having a desired pour point. The dewaxing treatment can be performed by a usual method such as a solvent dewaxing method or a contact dewaxing method. Among these, the solvent dewaxing method generally uses a mixed solvent of MEK and toluene, but may use a solvent such as benzene, acetone, MIBK or the like. In order to make the pour point of the dewaxed oil not more than −10 ° C., the solvent / oil ratio is 1 to 6 times, and the filtration temperature is −5 to −45 ° C., preferably −10 to −40 ° C. The wax removed here can be used again as a slack wax in the hydrocracking step.

  In the said manufacturing method, you may add a solvent refinement | purification process and / or a hydrorefining process to a dewaxing process. These additional treatments are performed in order to improve the ultraviolet stability and oxidation stability of the lubricating base oil, and can be carried out by a method used in a normal lubricating oil refining process.

  In the solvent purification, furfural, phenol, N-methylpyrrolidone or the like is generally used as a solvent, and a small amount of aromatic compounds, particularly polycyclic aromatic compounds remaining in the lubricating oil fraction are removed.

In addition, hydrorefining is performed to hydrogenate olefin compounds and aromatic compounds, and the catalyst is not particularly limited. However, at least one of Group VIa metals such as molybdenum, cobalt, nickel, etc. Using an alumina catalyst supporting at least one of the Group VIII metals, the reaction pressure (hydrogen partial pressure) is 7 to 16 MPa, the average reaction temperature is 300 to 390 ° C., and the LHSV is 0.5 to 4.0 hr ⁻¹ . Can be done below.

  Moreover, as a preferable example of the manufacturing method of the lubricating base oil according to the present invention, the following manufacturing method B can be mentioned.

That is, the production method B according to the present invention is:
A fifth step of hydrocracking and / or hydroisomerizing a feedstock containing paraffinic hydrocarbons in the presence of a catalyst;
A sixth step of dewaxing the product obtained in the fifth step or the lubricating oil fraction recovered from the product by distillation or the like;
Is provided.

  Hereinafter, the production method B will be described in detail.

(Raw oil)
In the production method B, a raw material oil containing paraffinic hydrocarbon is used. The “paraffinic hydrocarbon” referred to in the present invention means a hydrocarbon having a paraffin molecule content of 70% by mass or more. The carbon number of the paraffinic hydrocarbon is not particularly limited, but usually about 10 to 100 is used. The paraffinic hydrocarbon production method is not particularly limited, and various paraffinic hydrocarbons such as petroleum and synthetic can be used. Particularly preferable paraffinic hydrocarbons include a gas-liquid (GTL) process and the like. Synthetic waxes obtained (Fischer-Tropsch wax (FT wax), GTL wax, etc.) can be mentioned, among which FT wax is preferred. The synthetic wax is preferably a wax containing, as a main component, a normal paraffin having 15 to 80 carbon atoms, more preferably 20 to 50 carbon atoms.

The kinematic viscosity of the paraffinic hydrocarbon used in the preparation of the raw material oil can be appropriately selected according to the kinematic viscosity of the target lubricating base oil, but the low viscosity base oil is used as the lubricating base oil according to the present invention. To produce a relatively low viscosity paraffin having a kinematic viscosity at 100 ° C. of about ² to 25 mm ² / s, preferably about 2.5 to ²⁰ mm ² / s, more preferably about 3 to 15 mm ² / s. Series hydrocarbons are desirable. In addition, other properties of the paraffinic hydrocarbon are optional, but when the paraffinic hydrocarbon is a synthetic wax such as FT wax, the melting point is preferably 35 to 80 ° C, more preferably 50 to 80 ° C, More preferably, it is 60-80 degreeC. The oil content of the synthetic wax is preferably 10% by mass or less, more preferably 5% by mass or less, and further preferably 2% by mass or less. Further, the sulfur content of the synthetic wax is preferably 0.01% by mass or less, more preferably 0.001% by mass or less, and still more preferably 0.0001% by mass or less.

  When the raw material oil is a mixed oil of the above synthetic wax and another raw material oil, the other raw material oil is not particularly limited as long as the ratio of the synthetic wax to the total amount of the mixed oil is 50% by volume or more. A heavy atmospheric distillation oil and / or a mixed oil of reduced pressure distillation oil is preferably used.

  Further, when the raw material oil is a mixed oil of the above synthetic wax and other raw material oils, the proportion of the synthetic wax in the mixed oil is more than 70% by volume from the viewpoint of producing a base oil having a high viscosity index. Preferably, 75% by volume or more is even more preferable. If the ratio is less than 70% by volume, the lubricating base oil to be obtained tends to increase the oil content such as aromatics and naphthenes and decrease the viscosity index of the lubricating base oil.

  On the other hand, heavy crude pressure distillation distillate and / or vacuum distillation distillate of crude oil used in combination with synthetic wax is used at a distillation temperature of 300 to 570 ° C. in order to keep the viscosity index of the lubricating base oil to be produced high. A fraction having a distillate component of 60% by volume or more in the range is preferable.

(catalyst)
The catalyst used in production method B is not particularly limited, but a catalyst in which at least one selected from Group VI metal and Group VIII metal of the periodic table as an active metal component is supported on a support containing aluminosilicate. Preferably used.

  Aluminosilicate refers to a metal oxide composed of three elements of aluminum, silicon, and oxygen. Further, other metal elements can be allowed to coexist within a range that does not hinder the effects of the present invention. In this case, the amount of the other metal element is preferably 5% by mass or less, and more preferably 3% by mass or less of the total amount of alumina and silica as the oxide. Examples of metal elements that can coexist include titanium, lanthanum, manganese, and the like.

The crystallinity of aluminosilicate can be estimated by the proportion of tetracoordinate aluminum atoms in all aluminum atoms, and this proportion can be measured by ²⁷ Al solid state NMR. As the aluminosilicate used in the present invention, the ratio of tetracoordinated aluminum to the total amount of aluminum is preferably 50% by mass or more, more preferably 70% by mass or more, and further preferably 80% by mass or more. Hereinafter, an aluminosilicate having a ratio of tetracoordinated aluminum to the total amount of aluminum of 50% by mass or more is referred to as “crystalline aluminosilicate”.

  As the crystalline aluminosilicate, so-called zeolite can be used. Preferable examples include Y-type zeolite, ultra-stable Y-type zeolite (USY-type zeolite), β-type zeolite, mordenite, ZSM-5, etc. Among them, USY zeolite is particularly preferable. In the present invention, one type of crystalline aluminosilicate may be used alone, or two or more types may be used in combination.

  Examples of a method for preparing a carrier containing crystalline aluminosilicate include a method of molding a mixture of crystalline aluminosilicate and a binder and firing the molded body. The binder to be used is not particularly limited, but alumina, silica, silica alumina, titania and magnesia are preferable, and alumina is particularly preferable. The use ratio of the binder is not particularly limited, but is usually preferably 5 to 99% by mass and more preferably 20 to 99% by mass based on the total amount of the molded body. 430-470 degreeC is preferable, as for the baking temperature of the molded object containing a crystalline aluminosilicate and a binder, 440-460 degreeC is more preferable, and 445-455 degreeC is more preferable. The firing time is not particularly limited, but is usually 1 minute to 24 hours, preferably 10 minutes to 20 hours, more preferably 30 minutes to 10 hours. Firing may be performed in an air atmosphere, but is preferably performed in an oxygen-free atmosphere such as a nitrogen atmosphere.

  Examples of the Group VI b metal supported on the carrier include chromium, molybdenum, tungsten, and the like. Specific examples of the Group VIII metal include cobalt, nickel, rhodium, palladium, iridium, platinum, and the like. It is done. These metals may be used individually by 1 type, or may be used in combination of 2 or more types. When two or more kinds of metals are combined, noble metals such as platinum and palladium may be combined, base metals such as nickel, cobalt, tungsten and molybdenum may be combined, or a noble metal and a base metal may be combined.

  Further, the loading of the metal on the carrier can be performed by information such as impregnation of the carrier into a solution containing the metal, ion exchange, and the like. The amount of the metal supported can be appropriately selected, but is usually 0.05 to 2% by mass, preferably 0.1 to 1% by mass based on the total amount of the catalyst.

(Hydrolysis / Hydroisomerization process)
In the production method B, the feedstock oil containing paraffinic hydrocarbon is hydrocracked / hydroisomerized in the presence of the catalyst. Such hydrocracking / hydroisomerization step can be performed using a fixed bed reactor. As conditions for hydrocracking / hydroisomerization, for example, the temperature is preferably 250 to 400 ° C., the hydrogen pressure is preferably 0.5 to 10 MPa, and the liquid space velocity (LHSV) of the feedstock is preferably 0.5 to 10 h ^−1. .

(Distillation separation process)
Next, the lubricating oil fraction is distilled and separated from the cracked product oil obtained by the hydrocracking / hydroisomerization step. In addition, since the distillation separation process in the manufacturing method B is the same as the distillation separation process in the manufacturing method A, the overlapping description is abbreviate | omitted here.

(Dewaxing process)
Next, the lubricating oil fraction fractionated from the cracked product oil in the distillation separation step is dewaxed. Such a dewaxing step can be performed using a conventionally known dewaxing process such as solvent dewaxing or catalytic dewaxing. Here, if the substance having a boiling point of 370 ° C. or less present in the cracked / isomerized product oil is not separated from the high boiling point substance prior to dewaxing, depending on the use of the cracked / isomerized product oil, The compound may be dewaxed or a fraction having a boiling point of 370 ° C. or higher may be dewaxed.

  In solvent dewaxing, the hydroisomerized product is contacted with chilled ketone and acetone, and other solvents such as MEK, MIBK, and further cooled to precipitate the high pour point material as a waxy solid, which is precipitated with raffinate. Separate from a solvent-containing lubricating oil fraction. Further, the raffinate can be cooled with a scraped surface chiller to remove wax solids. Low molecular weight hydrocarbons such as propane can also be used for dewaxing. In this case, the cracked / isomerized product oil and the low molecular weight hydrocarbon are mixed and at least a part thereof is vaporized to decompose / isomerize. The product oil is further cooled to precipitate the wax. The wax is separated from the raffinate by filtration, membrane or centrifugation. Thereafter, the solvent is removed from the raffinate, and the raffinate is fractionally distilled to obtain the target lubricating base oil.

  In the case of catalytic dewaxing (catalyst dewaxing), the cracked / isomerized product oil is reacted with hydrogen in the presence of a suitable dewaxing catalyst under conditions effective to lower the pour point. In catalytic dewaxing, some of the high-boiling substances in the cracking / isomerization product are converted to low-boiling substances, the low-boiling substances are separated from the heavier base oil fraction, and the base oil fraction is fractionated. Two or more kinds of lubricating base oils are obtained. The low-boiling substances can be separated before obtaining the target lubricating base oil or during fractional distillation.

  The dewaxing catalyst is not particularly limited as long as it can lower the pour point of the cracked / isomerized product oil, but the desired lubricating base oil is obtained from the cracked / isomerized product oil in a high yield. Those that can be used are preferred. As such a dewaxing catalyst, a shape selective molecular sieve (molecular sieve) is preferable. Specifically, ferrierite, mordenite, ZSM-5, ZSM-11, ZSM-23, ZSM-35, ZSM-22 ( And theta aluminophosphates (SAPO) and the like. These molecular sieves are preferably used in combination with a catalytic metal component, and more preferably in combination with a noble metal. A preferable combination includes, for example, a composite of platinum and H-mordenite.

The dewaxing conditions are not particularly limited, but the temperature is preferably 200 to 500 ° C., and the hydrogen pressure is preferably 10 to 200 bar (1 MPa to 20 MPa). In the case of a flow-through reactor, the H ₂ treatment rate is preferably 0.1 to 10 kg / l / hr, and the LHSV is preferably 0.1 to 10 ^{−1 and} more preferably 0.2 to 2.0 h ^−1. . Dewaxing refers to a substance having an initial boiling point of 350 to 400 ° C., usually 40% by mass or less, preferably 30% by mass or less, contained in the cracked / isomerized product oil, having a boiling point lower than the initial boiling point. It is preferable to carry out the conversion to a substance having the same.

  As mentioned above, although the manufacturing method A and the manufacturing method B which are the preferable manufacturing methods of the lubricant base oil concerning this invention were demonstrated, the manufacturing method of the lubricant base oil concerning this invention is not limited to these. For example, in the above production method A, synthetic waxes such as FT wax and GTL wax may be used instead of slack wax. In the production method B, a raw material oil containing slack wax (preferably slack wax A, B) may be used. Furthermore, in each of the production methods A and B, slack wax (preferably slack wax A and B) and synthetic wax (preferably FT wax and GTL wax) may be used in combination.

  In addition, when the raw material oil used when manufacturing the lubricating base oil according to the present invention is a mixed oil of the above-described slack wax and / or synthetic wax and a raw material oil other than these waxes, slack wax The content of the synthetic wax is preferably 50% by mass or more based on the total amount of the raw material oil.

  Further, when producing a lubricating base oil satisfying the above condition (a), the raw oil is a raw oil containing slack wax and / or synthetic wax, and the oil content is 0 to 60% by mass, preferably A raw material oil containing 10 to 50% by mass is preferred; a raw material oil containing slack wax A and / or slack wax B, wherein the oil content is 0.5 to 60% by mass, preferably 10 to 50%. More preferably; a raw material oil containing slack wax B, in which the oil content is 5 to 60% by mass, preferably 10 to 50% by mass, is particularly preferable.

  In addition, when the lubricating base oil according to the present invention satisfies the above condition (a), the saturated content in the lubricating base oil is 90 mass as described above based on the total amount of the lubricating base oil. % Or more, preferably 95% by mass or more, more preferably 96% by mass or more, and still more preferably 97% by mass or more. Moreover, the ratio of the cyclic | annular saturated part which occupies for the said saturated part is 10-40 mass% as above-mentioned, Preferably it is 10.5-30 mass%, More preferably, it is 11-25 mass%, More preferably, it is 12-21. % By mass. Viscosity-temperature characteristics and thermal / oxidative stability can be achieved by satisfying the above conditions for the content of the saturated component and the ratio of the cyclic saturated component in the saturated component, respectively. When the additive is blended, the function of the additive can be expressed at a higher level while the additive is sufficiently stably dissolved and held in the lubricating base oil. Furthermore, when the content of the saturated component and the ratio of the cyclic saturated component in the saturated component satisfy the above conditions, the friction characteristics of the lubricating base oil itself can be improved, and as a result, the friction reducing effect is improved. As a result, energy saving can be improved.

  If the saturated content is less than 95% by mass, the viscosity-temperature characteristics, thermal / oxidation stability, and friction characteristics are insufficient. In addition, when the ratio of the cyclic saturated component in the saturated component is less than 0.1% by mass, the solubility of the additive may be insufficient when the additive is blended with the lubricating base oil. Since the effective amount of the additive dissolved and retained in the lubricating base oil is reduced, the function of the additive cannot be effectively obtained. Furthermore, when the ratio of the cyclic saturated component in the saturated component exceeds 10% by mass, the effectiveness of the additive is reduced when the additive is blended with the lubricating base oil.

  When the lubricating base oil according to the present invention satisfies the above condition (a), the proportion of the cyclic saturated component in the saturated component is 10 to 40% by mass. Is equivalent to 60 to 90% by mass. Here, the non-cyclic saturated component includes both a linear paraffin component and a branched paraffin component. The proportion of each paraffin component in the lubricating base oil according to the present invention is not particularly limited, but the proportion of the branched paraffin component is preferably 55 to 99 mass%, more preferably 57. It is 5-95 mass%, More preferably, it is 60-95 mass%, More preferably, it is 70-90 mass%, Most preferably, it is 80-90 mass%. When the ratio of the branched paraffin content in the lubricating base oil satisfies the above conditions, the viscosity-temperature characteristics and thermal / oxidative stability can be further improved, and an additive is added to the lubricating base oil. In this case, the function of the additive can be expressed at a higher level while the additive is sufficiently stably dissolved and held.

  In addition, content of the saturated part said by this invention means the value (unit: mass%) measured based on ASTM D 2007-93.

  Moreover, the ratio of the cyclic saturated component and the non-cyclic saturated component in the saturated component referred to in the present invention is a naphthene component measured according to ASTM D 2786-91, respectively (measuring object: 1-ring to 6-ring naphthene, unit : Mass%) and alkane content (unit: mass%).

In addition, the linear paraffin content in the lubricating base oil referred to in the present invention is the gas chromatographic analysis of the saturated content separated and separated by the method described in ASTM D 2007-93 under the following conditions. The value obtained by converting the measured value when the linear paraffin content in the saturated content is identified and quantified based on the total amount of the lubricating base oil is meant. In the identification and quantification, a mixed sample of straight-chain paraffin having 5 to 50 carbon atoms is used as a standard sample, and the straight-chain paraffin content in the saturated portion is the total peak area value of the chromatogram (in the diluent). It is determined as the ratio of the sum of peak area values corresponding to each linear paraffin to (excluding the peak area value derived from).
(Gas chromatography conditions)
Column: non-polar liquid phase column (length 25 mm, inner diameter 0.3 mmφ, liquid phase film thickness 0.1 μm)
Temperature rising condition: 50 ° C. to 400 ° C. (temperature rising rate: 10 ° C./min)
Carrier gas: helium (linear velocity: 40 cm / min)
Split ratio: 90/1
Sample injection amount: 0.5 μL (injection amount of sample diluted 20 times with carbon disulfide)

  The ratio of branched paraffin in the lubricating base oil is the difference between the non-cyclic saturated content in the saturated content and the linear paraffin content in the saturated content, converted based on the total amount of the lubricating base oil. Means the value.

  In the case of a method for separating saturated components, or a compositional analysis of cyclic saturated components, non-cyclic saturated components, etc., a similar method can be used in which similar results can be obtained. For example, in addition to the above, a method described in ASTM D 2425-93, a method described in ASTM D 2549-91, a method using high performance liquid chromatography (HPLC), a method obtained by improving these methods, and the like can be given.

Further, when the lubricating base oil according to the present invention satisfies the above condition (b), n ₂₀ −0.002 × kv100 is 1.440 to 1.453 as described above, preferably 1. 441 to 1.453, more preferably 1.443 to 1.452, and still more preferably 1.444 to 1.450. _By setting n ₂₀ −0.002 × kv100 within the above range, excellent viscosity-temperature characteristics and thermal / oxidative stability can be achieved, and an additive is blended in the lubricating base oil. In this case, the function of the additive can be expressed at a higher level while the additive is sufficiently stably dissolved and held in the lubricating base oil. Furthermore, by setting n ₂₀ −0.002 × kv100 within the above range, the friction characteristics of the lubricating base oil itself can be improved, and as a result, an improvement in friction reduction effect and an improvement in energy saving can be achieved. can do.

When n ₂₀ −0.002 × kv100 exceeds the upper limit, the viscosity-temperature characteristics, thermal / oxidation stability, and friction characteristics become insufficient, and further, an additive is blended in the lubricating base oil. In some cases, the effectiveness of the additive is reduced. Further, when n ₂₀ −0.002 × kv100 is less than the lower limit, when an additive is blended in the lubricating base oil, the solubility of the additive becomes insufficient, and the lubricating base oil contains Since the effective amount of the additive that is dissolved and held is lowered, the function of the additive cannot be effectively obtained.

In addition, the refractive index (n20) in ₂₀ degreeC said by this invention means the refractive index measured in 20 degreeC based on ASTMD1218-92. The kinematic viscosity (kv100) at 100 ° C. in the present invention means a kinematic viscosity measured at 100 ° C. in accordance with JIS K 2283-1993.

  The aromatic content in the lubricating base oil according to the present invention is not particularly limited as long as the lubricating base oil satisfies at least one of the above conditions (a) or (b), but based on the total amount of the lubricating base oil. The content is preferably 10% by mass or less, more preferably 0.1 to 5% by mass, still more preferably 0.2 to 4.5% by mass, and particularly preferably 0.3 to 3% by mass. If the aromatic content exceeds the above upper limit, the viscosity-temperature characteristics, thermal / oxidative stability, friction characteristics, volatilization prevention characteristics and low-temperature viscosity characteristics tend to decrease. When an additive is blended with the additive, the effectiveness of the additive tends to decrease. Moreover, the lubricating base oil according to the present invention may not contain an aromatic component, but by further increasing the solubility of the additive by setting the aromatic content to the above lower limit or more. Can do.

  In addition, content of an aromatic content here means the value measured based on ASTM D 2007-93. In general, the aromatic component includes alkylbenzene, alkylnaphthalene, anthracene, phenanthrene and alkylated products thereof, as well as compounds in which four or more benzene rings are condensed, pyridines, quinolines, phenols and naphthols. Aromatic compounds having atoms are included.

Further, the% C _p of the lubricating base oil according to the present invention is not particularly limited as long as the lubricating base oil satisfies at least one of the above conditions (a) or (b), but is preferably 80 or more. Preferably it is 82-99, More preferably, it is 85-98, Most preferably, it is 90-97. If the% C _p of the lubricating base oil is less than 80, the viscosity-temperature characteristics, thermal / oxidative stability, and friction characteristics tend to be reduced, and when the additive is added to the lubricating base oil The effectiveness of the additive tends to decrease. Further, when the% C _p value of the lubricating base oil exceeds 99, the additive solubility will tend to be lower.

Moreover,% C _N of the lubricating base oil according to the present invention is a lubricating oil base oil is not particularly limited so long as it satisfies at least one of the conditions (a) or (b), preferably 19 or less, more Preferably it is 5-15, More preferably, it is 7-13, Most preferably, it is 8-12. If the% C _N value of the lubricating base oil exceeds the upper limit value, the viscosity - temperature characteristic, heat and oxidation stability and frictional properties will tend to be reduced. Moreover, when% _CN is less than the said lower limit, it exists in the tendency for the solubility of an additive to fall.

Moreover,% C _A of the lubricating base oil according to the present invention is a lubricating oil base oil is not particularly limited so long as it satisfies at least one of the conditions (a) or (b), preferably 5 or less, more Preferably it is 2 or less, more preferably 1.5 or less, particularly preferably 1 or less. When% C _A of the lubricating base oil exceeds the upper limit value, the viscosity - temperature characteristic, heat and oxidation stability and frictional properties will tend to be reduced. Moreover,% C _A of the lubricating base oil according to the present invention may be 0% by 0.1 or more C _A, it is possible to further increase the solubility of additives.

Furthermore, the ratio of the% C _P and% C _N of the lubricating base oil according to the present invention is a lubricating oil base oil is not particularly limited so long as it satisfies at least one of the conditions (a) or (b) % preferably C P _/% C _N is 5 or more, more preferably 6 or more, more preferably 7 or more. When% C _P /% _CN is less than the above lower limit value, viscosity-temperature characteristics, thermal / oxidative stability and friction characteristics tend to decrease, and further, when an additive is blended in the lubricating base oil In addition, the effectiveness of the additive tends to decrease. _{Moreover,% C} P /% C _N is preferably 35 or less, more preferably 20 or less, further preferably 14 or less, and particularly preferably 13 or less. % Of C P _/% C _N by the above-described upper limit or less, it is possible to further increase the solubility of additives.

Incidentally, _say% C P in the present invention,% _C A _N and% _{C A,} obtained by a method in accordance with ASTM D 3238-85, respectively (n-d-M ring analysis), the total carbon number of the paraffin carbon number The percentage of the total number of naphthene carbons to the total number of carbons, and the percentage of the total number of aromatic carbons to the total number of carbons. That is, the preferred ranges of% C _P ,% C _N and% C _A described above are based on the values obtained by the above method. For example, even a lubricating base oil containing no naphthene is obtained by the above method. is% C _N may indicate a value greater than zero.

  Further, the content of sulfur in the lubricating base oil according to the present invention depends on the content of sulfur in the raw material. For example, when a raw material that does not substantially contain sulfur such as a synthetic wax component obtained by a Fischer-Tropsch reaction or the like is used, a lubricating base oil that does not substantially contain sulfur can be obtained. In addition, when using raw materials containing sulfur such as slack wax obtained in the refining process of the lubricating base oil and microwax obtained in the refining process, the sulfur content in the obtained lubricating base oil is usually 100 mass ppm. That's it. In the lubricating base oil according to the present invention, the content of sulfur is preferably 100 ppm by mass or less, more preferably 50 ppm by mass or less, from the viewpoint of further improvement in thermal and oxidation stability and low sulfur content. More preferably, it is more preferably 10 ppm by mass or less, and particularly preferably 5 ppm by mass or less.

  Further, from the viewpoint of cost reduction, it is preferable to use slack wax or the like as a raw material. In that case, the sulfur content in the obtained lubricating base oil is preferably 50 ppm by mass or less, and preferably 10 ppm by mass or less. More preferred. In addition, the sulfur content as used in the field of this invention means the sulfur content measured based on JISK2541-1996.

  The nitrogen content in the lubricating base oil according to the present invention is not particularly limited, but is preferably 5 ppm by mass or less, more preferably 3 ppm by mass or less, and further preferably 1 ppm by mass or less. If the nitrogen content exceeds 5 ppm by mass, the thermal and oxidation stability tends to decrease. In addition, the nitrogen content as used in the field of this invention means the nitrogen content measured based on JISK2609-1990.

The kinematic viscosity of the lubricating base oil according to the present invention is not particularly limited as long as the lubricating base oil satisfies at least one of the above conditions (a) or (b). , Preferably 1.5 to ²⁰ mm ² / s, more preferably 2.0 to 11 mm ² / s. When the kinematic viscosity at 100 ° C. of the lubricating base oil is less than 1.5 mm ² / s, it is not preferable in terms of evaporation loss. In addition, when trying to obtain a lubricating base oil having a kinematic viscosity at 100 ° C. exceeding 20 mm ² / s, the yield decreases, and the decomposition rate can be increased even when heavy wax is used as a raw material. Since it becomes difficult, it is not preferable.

In the present invention, it is preferable to use a lubricating base oil having a kinematic viscosity at 100 ° C. in the following range by distillation or the like.
(I) less than the kinematic viscosity at 100 ° C. is 1.5 mm ² / s or more 3.5 mm ² / s, more preferably kinematic viscosity at 2.0 to 3.0 mm ² / s lubricating base oils (II) 100 ° C. There 3.0 mm ² / s or more 4.5mm less than ² / s, more preferably a kinematic viscosity at 3.5~4.1mm ² / s lubricating base oil (III) 100 ℃ 4.5~20mm ² / s, more preferably 4.8 to 11 mm ² / s, particularly preferably 5.5 to 8.0 mm ² / s.

Moreover, the kinematic viscosity at 40 ° C. of the lubricating base oil according to the present invention is preferably 6.0 to 80 mm ² / s, more preferably 8.0 to 50 mm ² / s. In the present invention, it is preferred that a lubricating oil fraction having a kinematic viscosity at 40 ° C. in the following range is fractionated by distillation or the like and used.
(IV) less than the kinematic viscosity at 40 ° C. is 6.0 mm ² / s or more 12 mm ² / s, more preferably 8.0~12mm ² / s lubricating base oil (V) kinematic viscosity at 40 ° C. is 12 mm ² / More than s and less than 28 mm < ² > / s, more preferably 13-19 mm < ² > / s lubricating base oil (VI) The kinematic viscosity at 40 [deg.] C. is 28-50 mm < ² > / s, more preferably 29-45 mm < ² > / s, particularly preferred. Is a lubricating base oil of 30 to 40 mm ² / s.

  The lubricating base oils (I) and (IV) satisfy at least one of the above conditions (a) or (b), and in particular, have a low temperature viscosity as compared with conventional lubricating base oils having the same viscosity grade. It has excellent characteristics and can significantly reduce viscosity resistance and stirring resistance. Moreover, the BF viscosity in -40 degreeC can be 2000 mPa * s or less by mix | blending the (A) component in this invention. The BF viscosity at −40 ° C. means the viscosity measured according to JPI-5S-26-99.

  In addition, the lubricating base oil (II) and (V) satisfy at least one of the above conditions (a) or (b), in particular, compared with the conventional lubricating base oil having the same viscosity grade, Excellent low-temperature viscosity characteristics, volatilization prevention and lubricity. For example, in the lubricating base oils (II) and (V), the CCS viscosity at −35 ° C. can be set to 3000 mPa · s or less.

  The lubricating base oils (III) and (VI) satisfy at least one of the above conditions (a) or (b), so that the low temperature viscosity is lower than that of conventional lubricating base oils having the same viscosity grade. Excellent properties, volatilization prevention, thermal / oxidation stability and lubricity.

  The viscosity index of the lubricating base oil according to the present invention depends on the viscosity grade of the lubricating base oil. For example, the viscosity index of the lubricating oils (I) and (IV) is preferably 105 to 130, more preferably. Is 110 to 125, more preferably 120 to 125. The viscosity index of the lubricating base oils (II) and (V) is preferably 125 to 160, more preferably 130 to 150, and still more preferably 135 to 150. Further, the viscosity index of the lubricating base oils (III) and (VI) is preferably 135 to 180, more preferably 140 to 160. When the viscosity index is less than the lower limit, viscosity-temperature characteristics, thermal / oxidation stability, and further volatilization prevention properties tend to decrease.

  In addition, the viscosity index as used in the field of this invention means the viscosity index measured based on JISK2283-1993.

  Further, the refractive index at 20 ° C. of the lubricating base oil according to the present invention depends on the viscosity grade of the lubricating base oil. Is preferably 1.440 to 1.460, more preferably 1.442 to 1.458, and still more preferably 1.445 to 1.455. Moreover, the refractive index at 20 ° C. of the lubricating base oils (II) and (V) is preferably 1.450 to 1.465, more preferably 1.452 to 1.460, still more preferably 1.453 to 1.458. Further, the refractive index of the lubricating base oils (III) and (VI) at 20 ° C. is preferably 1.455 to 1.468, more preferably 1.458 to 1.466, and still more preferably 1.457 to 1.465. If the refractive index exceeds the above upper limit, the viscosity-temperature characteristics and thermal / oxidative stability of the lubricating base oil tend to be reduced, and further, the volatilization preventing properties and low-temperature viscosity characteristics tend to deteriorate. When an additive is blended with the additive, the effectiveness of the additive tends to decrease.

  Further, the pour point of the lubricating base oil according to the present invention depends on the viscosity grade of the lubricating base oil. For example, the pour point of the lubricating base oils (I) and (IV) is preferably −10. ° C or lower, more preferably -12.5 ° C or lower, still more preferably -15 ° C or lower. The pour points of the lubricating base oils (II) and (V) are preferably −10 ° C. or lower, more preferably −15 ° C. or lower, and still more preferably −17.5 ° C. or lower. The pour point of the lubricating base oils (III) and (VI) is preferably −10 ° C. or lower, more preferably −12.5 ° C. or lower, and still more preferably −15 ° C. or lower. When the pour point exceeds the upper limit, the low temperature fluidity of the entire lubricating oil using the lubricating base oil tends to decrease. In addition, the pour point as used in the field of this invention means the pour point measured based on JISK2269-1987.

  Further, the CCS viscosity of the lubricating base oil according to the present invention at −35 ° C. depends on the viscosity grade of the lubricating base oil, but for example, the lubricating base oils (I) and (IV) at −35 ° C. The CCS viscosity is preferably 1000 mPa · s or less. The CCS viscosity at −35 ° C. of the lubricating base oils (II) and (V) is preferably 3000 mPa · s or less, more preferably 2400 mPa · s or less, still more preferably 2200 mPa · s or less, and particularly preferably 2000 mPa · s. -S or less. Further, the CCS viscosity of the lubricating base oils (III) and (VI) at −35 ° C. is preferably 15000 mPa · s or less, more preferably 10000 mPa · s or less, and further preferably 8000 mPa · s or less. When the CCS viscosity at −35 ° C. exceeds the upper limit, the low-temperature fluidity of the entire lubricating oil using the lubricating base oil tends to decrease. In addition, the CCS viscosity at −35 ° C. in the present invention means a viscosity measured according to JIS K 2010-1993.

Further, the density (ρ ₁₅ , unit: g / cm ³ ) of the lubricating base oil according to the present invention at 15 ° C. depends on the viscosity grade of the lubricating base oil, but the value of ρ represented by the following formula (2) It is preferable that ρ ₁₅ ≦ ρ.
ρ = 0.0025 × kv100 + 0.820 (2)
[Wherein, kv100 represents the kinematic viscosity (mm ² / s) of the lubricating base oil at 100 ° C. ]

When ρ ₁₅ > ρ, the viscosity-temperature characteristics and thermal / oxidation stability, volatilization prevention properties and low-temperature viscosity characteristics tend to decrease, and additives are added to the lubricating base oil. In some cases, the effectiveness of the additive tends to decrease.

For example, ρ ₁₅ of the lubricating base oils (I) and (IV) is preferably 0.830 g / cm ³ or less, more preferably 0.825 g / cm ³ or less, and still more preferably 0.820 g / cm ³ or less. It is. The ρ ₁₅ of the lubricating base oils (II) and (V) is preferably 0.835 g / cm ³ or less, more preferably 0.830 g / cm ³ or less. The ρ ₁₅ of the lubricating base oils (III) and (VI) is preferably 0.840 g / cm ³ or less, more preferably 0.835 g / cm ³ or less.

  In addition, the density in 15 degreeC said by this invention means the density measured in 15 degreeC based on JISK2249-1995.

Further, the aniline point (AP (° C.)) of the lubricating base oil according to the present invention depends on the viscosity grade of the lubricating base oil, but is not less than the value of A represented by the following formula (3). It is preferable that ≧ A.
A = 4.1 × kv100 + 97 (3)
[Wherein, kv100 represents the kinematic viscosity (mm ² / s) of the lubricating base oil at 100 ° C. ]

  When AP <A, viscosity-temperature characteristics and thermal / oxidative stability, volatilization prevention properties and low-temperature viscosity characteristics tend to decrease, and when additives are added to the lubricating base oil In addition, the effectiveness of the additive tends to decrease.

  For example, the AP of the lubricating base oils (I) and (IV) is preferably 108 ° C. or higher, more preferably 110 ° C. or higher, and still more preferably 112 ° C. or higher. The AP of the lubricating base oils (II) and (V) is preferably 113 ° C. or higher, more preferably 116 ° C. or higher, still more preferably 118 ° C. or higher, and particularly preferably 120 ° C. or higher. The AP of the lubricating base oils (III) and (VI) is preferably 125 ° C. or higher, more preferably 127 ° C. or higher, and still more preferably 128 ° C. or higher. In addition, the aniline point as used in the field of this invention means the aniline point measured based on JISK2256-1985.

  Further, the NOACK evaporation amount of the lubricating base oil according to the present invention is not particularly limited. For example, the NOACK evaporation amount of the lubricating base oils (I) and (IV) is preferably 20% by mass or more, more preferably. Is 25 mass% or more, more preferably 30 or more, preferably 50 mass% or less, more preferably 45 mass% or less, and still more preferably 42 mass% or less. The NOACK evaporation amount of the lubricating base oils (II) and (V) is preferably 6% by mass or more, more preferably 8% by mass or more, still more preferably 10% by mass or more, and preferably 20%. It is not more than mass%, more preferably not more than 16 mass%, still more preferably not more than 15 mass%, particularly preferably not more than 14 mass%. Further, the NOACK evaporation amount of the lubricating base oils (III) and (VI) is preferably 1% by mass or more, more preferably 2% by mass or more, and preferably 8% by mass or less, more preferably 6%. It is at most 4% by mass, more preferably at most 4% by mass. When the NOACK evaporation amount is the lower limit value, it tends to be difficult to improve the low temperature viscosity characteristics. Further, when the NOACK evaporation amount exceeds the upper limit value, when the lubricating base oil is used as the lubricating oil for an internal combustion engine, the evaporation loss amount of the lubricating oil increases, and accordingly, catalyst poisoning is promoted. Therefore, it is not preferable. In addition, the NOACK evaporation amount as used in the field of this invention means the evaporation loss amount measured based on ASTM D 5800-95.

  Further, the distillation properties of the lubricating base oil according to the present invention are preferably gas chromatography distillation, wherein the initial boiling point (IBP) is 290 to 440 ° C. and the end point (FBP) is 430 to 580 ° C., and such a distillation range. The base oils (I) to (III) and (IV) to (VI) having the preferred viscosity ranges described above are obtained by rectifying one or more fractions selected from the fractions in be able to.

  For example, regarding the distillation properties of the lubricating base oils (I) and (IV), the initial boiling point (IBP) is preferably 260 to 360 ° C, more preferably 300 to 350 ° C, and still more preferably 310 to 350 ° C. It is. Moreover, 10% distillation temperature (T10) becomes like this. Preferably it is 320-400 degreeC, More preferably, it is 340-390 degreeC, More preferably, it is 350-380 degreeC. The 50% distillation point (T50) is preferably 350 to 430 ° C, more preferably 360 to 410 ° C, and still more preferably 370 to 400 ° C. Moreover, 90% distillation point (T90) becomes like this. Preferably it is 380-460 degreeC, More preferably, it is 390-450 degreeC, More preferably, it is 400-440 degreeC. Moreover, an end point (FBP) becomes like this. Preferably it is 420-520 degreeC, More preferably, it is 430-500 degreeC, More preferably, it is 440-480 degreeC. Moreover, T90-T10 becomes like this. Preferably it is 50-100 degreeC, More preferably, it is 55-85 degreeC, More preferably, it is 60-70 degreeC. Moreover, FBP-IBP becomes like this. Preferably it is 100-250 degreeC, More preferably, it is 110-220 degreeC, More preferably, it is 120-200 degreeC. Moreover, T10-IBP becomes like this. Preferably it is 10-80 degreeC, More preferably, it is 15-60 degreeC, More preferably, it is 20-50 degreeC. Moreover, FBP-T90 becomes like this. Preferably it is 10-80 degreeC, More preferably, it is 15-70 degreeC, More preferably, it is 20-60 degreeC.

  Moreover, regarding the distillation properties of the lubricating base oils (II) and (V), the initial boiling point (IBP) is preferably 300 to 380 ° C, more preferably 320 to 370 ° C, still more preferably 330 to 360 ° C. It is. Moreover, 10% distillation temperature (T10) becomes like this. Preferably it is 340-420 degreeC, More preferably, it is 350-410 degreeC, More preferably, it is 360-400 degreeC. The 50% distillation point (T50) is preferably 380 to 460 ° C, more preferably 390 to 450 ° C, and still more preferably 400 to 460 ° C. Moreover, 90% distillation point (T90) becomes like this. Preferably it is 440-500 degreeC, More preferably, it is 450-490 degreeC, More preferably, it is 460-480 degreeC. Moreover, an end point (FBP) becomes like this. Preferably it is 460-540 degreeC, More preferably, it is 470-530 degreeC, More preferably, it is 480-520 degreeC. Moreover, T90-T10 becomes like this. Preferably it is 50-100 degreeC, More preferably, it is 60-95 degreeC, More preferably, it is 80-90 degreeC. Moreover, FBP-IBP becomes like this. Preferably it is 100-250 degreeC, More preferably, it is 120-180 degreeC, More preferably, it is 130-160 degreeC. Moreover, T10-IBP becomes like this. Preferably it is 10-70 degreeC, More preferably, it is 15-60 degreeC, More preferably, it is 20-50 degreeC. Moreover, FBP-T90 becomes like this. Preferably it is 10-50 degreeC, More preferably, it is 20-40 degreeC, More preferably, it is 25-35 degreeC.

  Further, regarding the distillation properties of the lubricating base oils (III) and (VI), the initial boiling point (IBP) is preferably 320 to 480 ° C, more preferably 350 to 460 ° C, still more preferably 380 to 440 ° C. It is. Moreover, 10% distillation temperature (T10) becomes like this. Preferably it is 420-500 degreeC, More preferably, it is 430-480 degreeC, More preferably, it is 440-460 degreeC. The 50% distillation point (T50) is preferably 440 to 520 ° C, more preferably 450 to 510 ° C, and still more preferably 460 to 490 ° C. Moreover, 90% distillation point (T90) becomes like this. Preferably it is 470-550 degreeC, More preferably, it is 480-540 degreeC, More preferably, it is 490-520 degreeC. Moreover, an end point (FBP) becomes like this. Preferably it is 500-580 degreeC, More preferably, it is 510-570 degreeC, More preferably, it is 520-560 degreeC. Moreover, T90-T10 becomes like this. Preferably it is 50-120 degreeC, More preferably, it is 55-100 degreeC, More preferably, it is 55-90 degreeC. Moreover, FBP-IBP becomes like this. Preferably it is 100-250 degreeC, More preferably, it is 110-220 degreeC, More preferably, it is 115-200 degreeC. Moreover, T10-IBP becomes like this. Preferably it is 10-100 degreeC, More preferably, it is 15-90 degreeC, More preferably, it is 20-50 degreeC. Moreover, FBP-T90 becomes like this. Preferably it is 10-50 degreeC, More preferably, it is 20-40 degreeC, More preferably, it is 25-35 degreeC.

  In each of the lubricating base oils (I) to (VI), IBP, T10, T50, T90, FBP, T90-T10, FBP-IBP, T10-IBP, and FBP-T90 are set to the above preferable ranges. Further, it is possible to further improve the low temperature viscosity and further reduce the evaporation loss. In addition, about each of T90-T10, FBP-IBP, T10-IBP, and FBP-T90, when the distillation range is made too narrow, the yield of lubricating base oil is deteriorated, which is not preferable in terms of economy. .

  In the present invention, IBP, T10, T50, T90 and FBP mean distillate points measured in accordance with ASTM D 2887-97, respectively.

  Further, the residual metal content in the lubricating base oil according to the present invention is derived from the metal content contained in the catalyst and raw materials that are inevitably mixed in the manufacturing process, but it is preferable that the residual metal content be sufficiently removed. . For example, the contents of Al, Mo, and Ni are each preferably 1 mass ppm or less. If the content of these metals exceeds the above upper limit, the function of the additive blended with the lubricating base oil tends to be inhibited.

  In addition, the residual metal content as used in the field of this invention means the metal content measured based on JPI-5S-38-2003.

  Moreover, according to the lubricating base oil of the present invention, excellent thermal and oxidation stability can be achieved by satisfying at least one of the above conditions (a) or (b). Accordingly, it is preferable to show the RBOT life shown below. For example, the BROT life of the lubricating base oils (I) and (IV) is preferably 290 min or more, more preferably 300 min or more, and further preferably 310 min or more. The RBOT life of the lubricating base oils (II) and (V) is preferably 350 min or more, more preferably 360 min or more, and further preferably 370 min or more. The RBOT life of the lubricating base oils (III) and (VI) is preferably 400 min or more, more preferably 410 min or more, and further preferably 420 min or more. When the RBOT life is less than the lower limit, the viscosity-temperature characteristics and thermal / oxidative stability of the lubricating base oil tend to decrease. Further, when an additive is blended in the lubricating base oil, The effectiveness of the additive tends to decrease.

  The RBOT life as used herein refers to a composition in which 0.2% by mass of a phenolic antioxidant (2,6-di-tert-butyl-p-cresol; DBPC) is added to a lubricating base oil. It means the RBOT value measured according to JIS K 2514-1996.

  In the lubricating oil composition for a drive transmission device of the present invention, the lubricating base oil according to the present invention may be used alone, and the lubricating base oil according to the present invention may be one of other base oils or You may use together with 2 or more types. When the lubricating base oil according to the present invention is used in combination with another base oil, the ratio of the lubricating base oil according to the present invention in the mixed base oil is preferably 30% by mass or more. 50% by mass or more is more preferable, and 70% by mass or more is still more preferable.

Although it does not restrict | limit especially as another base oil used together with the lubricating base oil concerning this invention, As a mineral oil type | system | group base oil, solvent refined mineral oil whose kinematic viscosity in 100 degreeC is 1-100 mm < ² > / s, for example, hydrogen Examples include hydrocracked mineral oil, hydrorefined mineral oil, and solvent dewaxing base oil.

  Synthetic base oils include poly α-olefins or hydrides thereof, isobutene oligomers or hydrides thereof, isoparaffins, alkylbenzenes, alkylnaphthalenes, diesters (ditridecyl glutarate, di-2-ethylhexyl adipate, diisodecyl adipate, ditridec Decyl adipate, di-2-ethylhexyl sebacate, etc.), polyol ester (trimethylolpropane caprylate, trimethylolpropane pelargonate, pentaerythritol 2-ethylhexanoate, pentaerythritol pelargonate, etc.), polyoxyalkylene glycol, dialkyl Examples thereof include diphenyl ether and polyphenyl ether, and among them, poly α-olefin is preferable. As the poly α-olefin, typically, an oligomer or co-oligomer (1-octene oligomer, decene oligomer, ethylene-propylene co-oligomer, etc.) having 2 to 32 carbon atoms, preferably 6 to 16 carbon atoms, and those. Of the hydrides.

  The production method of the poly-α-olefin is not particularly limited. For example, Friedel-Crafts catalyst containing a complex of aluminum trichloride or boron trifluoride with water, alcohol (ethanol, propanol, butanol, etc.), carboxylic acid or ester. And a method of polymerizing α-olefin in the presence of a polymerization catalyst such as

  Moreover, the lubricating oil composition for a drive transmission device of the present invention contains a poly (meth) acrylate viscosity index improver as the component (A). By combining the poly (meth) acrylate viscosity index improver and the lubricating base oil according to the present invention, the viscosity index is improved in addition to the excellent viscosity-temperature characteristics inherently possessed by the lubricating base oil. The effect, the suppression effect of thickening at low temperature, the pour point depressing action, and the like are effectively exhibited, so that a high level of low temperature characteristics can be achieved.

  The poly (meth) acrylate viscosity index improver used in the present invention is not particularly limited, and non-dispersed or dispersed poly (meth) acrylate compounds used as viscosity index improvers for lubricating oils can be used. It is. Non-dispersed poly (meth) acrylate viscosity index improvers include polymers of compounds represented by the following general formula (4).

In the general formula (4), R ¹ represents an alkyl group having 1 to 30 carbon atoms. The alkyl group represented by R ¹ may be linear or branched. Specifically, methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, heptyl group, octyl group, nonyl group, decyl group, decyl group, undecyl group, dodecyl group, tridecyl group, tetradecyl group, Pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group, nonadecyl group, icosyl group, heicosyl group, docosyl group, tricosyl group, tetracosyl group, pentacosyl group, hexacosyl group, heptacosyl group, octacosyl group, nonacosyl group, triacontyl group, etc. Examples of the alkyl group may be linear or branched.

  In addition, as the dispersion type poly (meth) acrylate viscosity index improver, specifically, for example, one or more monomers selected from the compounds represented by the general formula (4), Preferred examples include copolymers obtained by copolymerizing one or more nitrogen-containing monomers selected from the compounds represented by the following general formula (5) or (6).

In the general formulas (5) and (6), R ² and R ⁴ each independently represent a hydrogen atom or a methyl group. R ³ represents an alkylene group having 1 to 30 carbon atoms, specifically, methylene group, ethylene group, propylene group, butylene group, pentylene group, hexylene group, heptylene group, octylene group, nonylene group, decylene group, Undecylene group, dodecylene group, tridecylene group, tetradecylene group, pentadecylene group, hexadecylene group, heptadecylene group, octadecylene group, nonadecylene group, icosylene group, heicosylene group, docosylene group, tricosylene group, tetracosylene group, pentacosylene group, hexacosylene group And a heptacosylene group, an octacosylene group, a nonacosylene group, a triacontylene group and the like (these alkylene groups may be linear or branched). a represents an integer of 0 or 1, and X ¹ and X ² each independently represent an amine residue or a heterocyclic residue containing 1 to 2 nitrogen atoms and 0 to 2 oxygen atoms. Yes. Specific examples of X ¹ and X ² include dimethylamino group, diethylamino group, dipropylamino group, dibutylamino group, anilino group, toluidino group, xylidino group, acetylamino group, benzoylamino group, morpholino group, Preferred examples include pyrrolyl group, pyrrolino group, pyridyl group, methylpyridyl group, pyrrolidinyl group, piperidinyl group, quinonyl group, pyrrolidonyl group, pyrrolidono group, imidazolino group and pyrazino group.

  Specific examples of preferred nitrogen-containing monomers represented by the general formula (5) or (6) include dimethylaminomethyl methacrylate, diethylaminomethyl methacrylate, dimethylaminoethyl methacrylate, diethylaminoethyl methacrylate, 2-methyl-5- Examples thereof include vinylpyridine, morpholinomethyl methacrylate, morpholinoethyl methacrylate, N-vinylpyrrolidone, and mixtures thereof.

The poly (meth) acrylate viscosity index improver used in the present invention may be either a dispersion type or non-dispersion type as described above, but a non-dispersion type poly (meth) acrylate viscosity index improver. Are preferably used, and those shown in the following (A-1) to (A-3) are more preferable.
(A-1) Polymer (A-2) in general formula (1) whose main component is a monomer in which R ¹ in general formula (1) is a methyl group or a linear alkyl group having 12 to 15 carbon atoms Polymer (A-3) whose main component is a monomer in which R ¹ is a methyl group or a linear alkyl group having 12 to 15, 16, or 18 carbon atoms, R ¹ in general formula (1) is a methyl group or a carbon number a monomer as a straight-chain alkyl group of 12～15,16,18, polymers of ^{R 1} in the general formula (1) is a monomer that is a linear or branched alkyl group having 20 to 30 carbon atoms.

Further, among the polymers (A-1) to (A-3), the polymers (A-2) and (A-3) are particularly preferable from the viewpoint of improving the fatigue life. In addition, the polymer (A-3) includes a monomer in which R ¹ in the general formula (1) is a branched alkyl group having 22 to 28 carbon atoms (more preferably a 2-decyltetradecyl group) as a structural unit. It is preferable.

  The weight average molecular weight of the poly (meth) acrylate viscosity index improver used in the present invention is not particularly limited, but is preferably 5,000 to 100,000, more preferably 10,000 to 60,000, and further Preferably it is 15,000-24,000. If the weight average molecular weight of the poly (meth) acrylate-based viscosity index improver is less than 5,000, the effect of thickening due to the addition of the viscosity index improver is insufficient, and if it exceeds 100,000, fatigue life, Abrasion and shear stability are insufficient. In addition, the weight average molecular weight as used herein means that two Tosoh columns GMHHR-M (7.8 mm ID × 30 cm) are set in series on a Wotaz 150-C ALC / GPC apparatus, and tetrahydrofuran is detected as a solvent. This means a polystyrene-reduced weight average molecular weight measured under the conditions of a suggested refractometer (RI) as a vessel, a temperature of 23 ° C., a flow rate of 1 mL / min, a sample concentration of 1 mass%, and a sample injection amount of 75 μL.

  The content of the poly (meth) acrylate viscosity index improver in the lubricating oil composition for a drive transmission device of the present invention is preferably 0.1 to 20% by mass, more preferably 1 to 15 based on the total amount of the composition. % By mass. When the content of the poly (meth) acrylate viscosity index improver is less than 0.1% by mass, the effect of increasing the viscosity and the effect of improving the low temperature fluidity tend to be insufficient, and 20% by mass. If it exceeds 1, the viscosity of the lubricating oil composition will increase, making it difficult to save fuel, and shear stability will tend to be reduced. When a poly (meth) acrylate viscosity index improver is added to the lubricating base oil, the poly (meth) acrylate viscosity index improver is diluted by 5 to 95% by mass in order to improve lubricity and handling properties. Generally, the mixture is dissolved in a lubricant and the mixture is added to the lubricating base oil. The content of the poly (meth) acrylate viscosity index improver here is the poly (meth) acrylate viscosity index It means the total amount of improver and diluent.

  The lubricating oil composition for a drive transmission device of the present invention contains a phosphorus-containing compound as the component (B). As the phosphorus-containing compound, a phosphorus extreme pressure agent and a phosphorus-sulfur extreme pressure agent are preferably used.

  Examples of the phosphorous extreme pressure agent include phosphoric acid, phosphorous acid, phosphoric acid esters having 1 to 30 carbon atoms, preferably 3 to 20 carbon atoms, phosphorous acid esters, and salts thereof. Can be mentioned. Examples of the phosphorus-sulfur extreme pressure agent include thiophosphoric acid, thiophosphorous acid, thiophosphoric acid esters having 1 to 30 carbon atoms, preferably 3 to 20 carbon atoms, and thiophosphorous acid esters. And salts thereof, and zinc dithiophosphate.

  Examples of the hydrocarbon group having 1 to 30 carbon atoms include an alkyl group, a cycloalkyl group, an alkylcycloalkyl group, an alkenyl group, an aryl group, an alkylaryl group, and an arylalkyl group.

  Examples of the alkyl group include ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl And alkyl groups such as a group, a heptadecyl group, and an octadecyl group (these alkyl groups may be linear or branched).

As a cycloalkyl group, C5-C7 cycloalkyl groups, such as a cyclopentyl group, a cyclohexyl group, and a cycloheptyl group, can be mentioned, for example.
Examples of the alkylcycloalkyl group include a methylcyclopentyl group, a dimethylcyclopentyl group, a methylethylcyclopentyl group, a diethylcyclopentyl group, a methylcyclohexyl group, a dimethylcyclohexyl group, a methylethylcyclohexyl group, a diethylcyclohexyl group, a methylcycloheptyl group, a dimethylcyclopentyl group, and the like. Examples thereof include an alkylcycloalkyl group having 6 to 11 carbon atoms such as a heptyl group, a methylethylcycloheptyl group, and a diethylcycloheptyl group (the substitution position of the alkyl group with the cycloalkyl group is also arbitrary).

  Examples of alkenyl groups include butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, undecenyl, dodecenyl, tridecenyl, tetradecenyl, pentadecenyl, hexadecenyl, heptadecenyl, and An alkenyl group such as an octadecenyl group (these alkenyl groups may be linear or branched, and the position of the double bond is also optional).

  As an aryl group, aryl groups, such as a phenyl group and a naphthyl group, can be mentioned, for example.

  As the alkylaryl group, for example, tolyl group, xylyl group, ethylphenyl group, propylphenyl group, butylphenyl group, pentylphenyl group, hexylphenyl group, heptylphenyl group, octylphenyl group, nonylphenyl group, decylphenyl group, And an alkylaryl group having 7 to 18 carbon atoms such as undecylphenyl group and dodecylphenyl group (the alkyl group may be linear or branched, and the substitution position on the aryl group is arbitrary). it can.

  Examples of the arylalkyl group include arylalkyl groups having 7 to 12 carbon atoms such as benzyl group, phenylethyl group, phenylpropyl group, phenylbutyl group, phenylpentyl group, and phenylhexyl group (these alkyl groups may be linear). It may be branched).

  In the present invention, at least one selected from phosphorous acid, phosphorous acid monoesters, phosphorous acid diesters, phosphorous acid triesters, and salts thereof may be used as the phosphorus extreme pressure agent. preferable. As the phosphorus-sulfur extreme pressure agent, thiophosphorous acid, thiophosphorous acid monoesters, thiophosphorous diesters, thiophosphorous triesters, dithiophosphorous acid, dithiophosphorous acid Monoesters, dithiophosphite diesters, dithiophosphite triesters, trithiophosphite, trithiophosphite monoesters, trithiophosphite diesters, trithiophosphite triesters, and these It is preferable to use at least one selected from salts.

  Preferable examples of the phosphorus-based extreme pressure agent include monobutyl phosphate, monooctyl phosphate, monolauryl phosphate, dibutyl phosphate, dioctyl phosphate, dilauryl phosphate, diphenyl phosphate, tributyl phosphate, trioctyl phosphate, trilauryl. Phosphate, triphenyl phosphate; monobutyl phosphite, monooctyl phosphite, monolauryl phosphite, dibutyl phosphite, dioctyl phosphite, dilauryl phosphite, diphenyl phosphite, tributyl phosphite, trioctyl phosphite, trilauryl phosphite Phosphite, triphenyl phosphite; and salts thereof, among others, phosphite-based extreme pressure agents, particularly phosphorous acid It is preferably an ester-based extreme pressure agent.

  Further, preferred examples of the phosphorus-sulfur extreme pressure agent include, specifically, monobutylthiophosphate and monooctylthio having 1 to 3, preferably 2 or 3, particularly 3 sulfur atoms in the molecule. Phosphate, monolauryl thiophosphate, dibutyl thiophosphate, dioctyl thiophosphate, dilauryl thiophosphate, diphenyl thiophosphate, tributyl thiophosphate, trioctyl thiophosphate, triphenyl thiophosphate, trilauryl thiophosphate; monobutyl thiophosphate, mono Octyl thiophosphite, monolauryl thiophosphite, dibutyl thiophosphite, dioctyl thiophosphite, dilauryl thiophosphite, diphenyl thiophosphate, tributyl thiophosphite, Examples include thiooctyl thiophosphite, triphenyl thiophosphite, trilauryl thiophosphite; and salts thereof. Among them, thiophosphite extreme pressure agent, particularly trithiophosphite extreme pressure agent. It is preferable.

  Examples of salts of (thio) phosphate esters and (thio) phosphite esters include (thio) phosphate monoester, (thio) phosphate diester, (thio) phosphorous acid monoester, ( (Thio) Phosphorous acid diester, etc., ammonia, nitrogen compounds such as amine compounds containing only 1 to 8 hydrocarbon groups or hydroxyl group-containing hydrocarbon groups in the molecule, or metal bases such as zinc oxide and zinc chloride The salt etc. which made it act and neutralize some or all of the remaining acidic hydrogen can be mentioned.

  Specific examples of the nitrogen compound include ammonia; monomethylamine, monoethylamine, monopropylamine, monobutylamine, monopentylamine, monohexylamine, monoheptylamine, monooctylamine, dimethylamine, methylethylamine, diethylamine, Alkylamines such as methylpropylamine, ethylpropylamine, dipropylamine, methylbutylamine, ethylbutylamine, propylbutylamine, dibutylamine, dipentylamine, dihexylamine, diheptylamine, dioctylamine (the alkyl group may be linear or branched) Monomethanolamine, monoethanolamine, monopropanolamine, monobutanolamine, monopentanolamine, monohexanolamine, mono Butanolamine, monooctanolamine, monononanolamine, dimethanolamine, methanolethanolamine, diethanolamine, methanolpropanolamine, ethanolpropanolamine, dipropanolamine, methanolbutanolamine, ethanolbutanolamine, propanolbutanolamine, dibutanolamine, And alkanolamines such as dipentanolamine, dihexanolamine, diheptanolamine and dioctanolamine (the alkanol group may be linear or branched); and mixtures thereof.

  As the phosphorus-containing compound used in the present invention, it is preferable to use a phosphite diester extreme pressure agent such as di-2-ethylhexyl phosphite in terms of improving fatigue life and heat / oxidation stability. Use of a trithiophosphite triester extreme pressure agent such as lauryl trithiophosphite is preferred from the viewpoint of improving fatigue life, and use of zinc dialkyldithiophosphate is preferred from the viewpoint of improving wear resistance.

  The content of the phosphorus-containing compound in the present invention is not particularly limited, but from the viewpoint of fatigue life, extreme pressure, wear resistance, oxidation stability, and the like, it is preferably 0.01 in terms of phosphorus element, based on the total amount of the composition. It is -0.2 mass%, More preferably, it is 0.02-0.15 mass%. When the content of the phosphorus-containing compound is less than the lower limit value, the lubricity tends to be insufficient. Further, when the lubricating oil composition is used as a lubricating oil for a manual transmission, there is a tendency that the synchro characteristics (lubricating so that gears with different reduction ratios can mesh well and perform their functions) are insufficient. On the other hand, when the content of the phosphorus-containing compound exceeds the upper limit, the fatigue life tends to be insufficient. Further, when the lubricating oil composition is used as a lubricating oil for manual transmission, the thermal / oxidation stability tends to be insufficient.

  The lubricating oil composition for a drive transmission device of the present invention may be composed only of the above lubricating base oil, a poly (meth) acrylate viscosity index improver, and a phosphorus-containing compound, but if necessary You may further contain the various additives shown below.

  The lubricating oil composition for a drive transmission device according to the present invention further contains a sulfur-based extreme pressure agent other than the above-described phosphorus-sulfur extreme pressure agent from the viewpoint of further improving fatigue life, extreme pressure property and wear resistance. Is preferred. Examples of sulfur-based extreme pressure agents include sulfurized oils and fats, sulfurized olefins, dihydrocarbyl polysulfides, dithiocarbamates, thiadiazoles, and benzothiazoles. Among them, sulfurized oils and fats, sulfurized olefins, and dihydrocarbyl polysulfides. , At least one sulfur-based extreme pressure agent selected from dithiocarbamates, thiadiazoles, and benzothiazoles is preferable.

  Examples of sulfurized fats and oils include sulfurized lard, sulfurized rapeseed oil, sulfurized castor oil, sulfurized soybean oil, and sulfurized rice bran oil; disulfide fatty acids such as sulfurized oleic acid; and sulfurized esters such as methyl sulfide oleate. .

Examples of the sulfurized olefin include compounds represented by the following general formula (7).
R ⁵ -S _x -R ⁶ (7)

In the general formula (7), R ⁵ represents an alkenyl group having 2 to 15 carbon atoms, R ⁶ represents an alkyl group or alkenyl group having 2 to 15 carbon atoms, and x represents an integer of 1 to 8. This compound can be obtained by reacting an olefin having 2 to 15 carbon atoms or a dimer or tetramer thereof with a sulfurizing agent such as sulfur or sulfur chloride. As the olefin, for example, propylene, isobutene, diisobutene and the like are preferably used.

Dihydrocarbyl polysulfide is a compound represented by the following general formula (8).
R ⁷ -S _y -R ⁸ (8)

In General Formula (8), R ⁷ and R ⁸ are each independently an alkyl group having 1 to 20 carbon atoms (including a cycloalkyl group), an aryl group having 6 to 20 carbon atoms, or an aryl having 7 to 20 carbon atoms. Represents an alkyl group, which may be the same or different from each other, and y represents an integer of 2 to 8; Specific examples of R ⁷ and R ⁸ include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, and various pentyl groups. Groups, various hexyl groups, various heptyl groups, various octyl groups, various nonyl groups, various decyl groups, various dodecyl groups, cyclohexyl groups, phenyl groups, naphthyl groups, tolyl groups, xylyl groups, benzyl groups, and phenethyl groups. be able to.

  Specific examples of preferred dihydrocarbyl polysulfides include dibenzyl polysulfide, di-tert-nonyl polysulfide, didodecyl polysulfide, di-tert-butyl polysulfide, dioctyl polysulfide, diphenyl polysulfide, and dicyclohexyl polysulfide. It is done.

  Specific examples of dithiocarbamates include compounds represented by the following general formula (9) or (10).

In the general formulas (9) and (10), R ⁹ , R ¹⁰ , R ¹¹ , R ¹² , R ¹³ and R ¹⁴ each independently represent a hydrocarbon group having 1 to 30 carbon atoms, preferably 1 to 20 carbon atoms. , R ¹⁵ represents a hydrogen atom or a hydrocarbon group having 1 to 30 carbon atoms, preferably a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms, b represents an integer of 0 to 4, and c represents an integer of 0 to 6. . Examples of the hydrocarbon group having 1 to 30 carbon atoms include an alkyl group, a cycloalkyl group, an alkylcycloalkyl group, an alkenyl group, an aryl group, an alkylaryl group, and an arylalkyl group.

  Examples of the thiadiazoles include a 1,3,4-thiadiazole compound represented by the following general formula (11), a 1,2,4-thiadiazole compound represented by the general formula (12), and a general formula (13). Mention may be made of 1,4,5-thiadiazole compounds.

In the general formulas (11) to (13), R ¹⁶ , R ¹⁷ , R ¹⁸ , R ¹⁹ , R ²⁰ and R ²¹ may be the same or different, and each independently represents a hydrogen atom or a carbon number of 1 to 30. D, e, f, g, h, and i each independently represents an integer of 0-8. Examples of the hydrocarbon group having 1 to 30 carbon atoms include an alkyl group, a cycloalkyl group, an alkylcycloalkyl group, an alkenyl group, an aryl group, an alkylaryl group, and an arylalkyl group.

  The content of the sulfur-based extreme pressure agent in the lubricating oil composition for a drive transmission device of the present invention is not particularly limited, but based on the total amount of the composition in terms of fatigue life, extreme pressure properties, wear resistance, oxidation stability, etc. In terms of sulfur element, it is preferably 0.01 to 3% by mass, more preferably 0.1 to 3% by mass, still more preferably 0.5 to 2.5% by mass, and particularly preferably 1 .5 to 2.5% by mass. When the content of the sulfur-based extreme pressure agent is less than the lower limit value, the lubricity tends to be insufficient. Further, when the lubricating oil composition is used as a lubricating oil for a manual transmission, there is a tendency that the synchro characteristics (lubricating so that gears with different reduction ratios can mesh well and perform their functions) are insufficient. On the other hand, when the content of the sulfur-based extreme pressure agent exceeds the upper limit, the fatigue life tends to be insufficient. Further, when the lubricating oil composition is used as a lubricating oil for manual transmission, the thermal / oxidation stability tends to be insufficient. In addition, when using the lubricating oil composition for a drive transmission device of the present invention, particularly as a lubricating oil for a final reduction gear, since it is necessary to further increase the extreme pressure, the content of the sulfur-based extreme pressure agent, Based on the total amount of the composition, it is preferably 0.5 to 3% by mass and more preferably 1.5 to 2.5% by mass in terms of elemental sulfur.

  In addition, the lubricating oil composition for a drive transmission device of the present invention contains a poly (meth) acrylate viscosity index improver as described above, but other than the poly (meth) acrylate viscosity index improver. You may further contain a viscosity index improver. Such viscosity index improvers include dispersed ethylene-α-olefin copolymers or hydrogenated products thereof, polyisobutylene or hydrogenated products thereof, styrene-diene hydrogenated copolymers, styrene-maleic anhydride ester copolymers, and poly Examples thereof include alkyl styrene.

  When using these viscosity index improvers, the content thereof is usually selected from the range of 0.1 to 10% by mass based on the total amount of the composition.

Moreover, it is preferable that the lubricating oil composition for a drive transmission device of the present invention further contains an ashless dispersant from the viewpoint of further improving wear resistance, heat / oxidation stability, and friction characteristics. Examples of the ashless dispersant include the following nitrogen compounds (D-1) to (D-3). These can be used alone or in combination of two or more.
(D-1) Succinimide having at least one alkyl group or alkenyl group having 40 to 400 carbon atoms in the molecule, or a derivative thereof (D-2) An alkyl group or alkenyl group having 40 to 400 carbon atoms in the molecule Or a derivative thereof (D-3) a polyamine having at least one alkyl group or alkenyl group having 40 to 400 carbon atoms in the molecule, or a derivative thereof.

  More specifically, examples of (D-1) succinimide include compounds represented by the following general formula (14) or (15).

In the general formula (14), R ²² represents an alkyl group or alkenyl group having 40 to 400 carbon atoms, preferably 60 to 350 carbon atoms, and j represents an integer of 1 to 5, preferably 2 to 4.

In the general formula (15), R ²³ and R ²⁴ each independently represents an alkyl group or an alkenyl group having 40 to 400 carbon atoms, preferably 60 to 350, and k is 0 to 4, preferably 1 to 3. Indicates an integer.

  In the succinimide, a so-called monotype succinimide represented by the general formula (14) in which succinic anhydride is added to one end of the polyamine is added by imidization, and succinic anhydride is added to both ends of the polyamine. The so-called bis-type succinimide represented by the general formula (15) in the form is included, and any of them or a mixture thereof can be used in the composition of the present invention.

  (D-2) More specifically, examples of benzylamine include compounds represented by the following general formula (16).

In the general formula (16), R ²⁵ represents an alkyl or alkenyl group having 40 to 400 carbon atoms, preferably 60 to 350, and m represents an integer of 1 to 5, preferably 2 to 4.

  The benzylamine is obtained by reacting, for example, polyolefin (for example, propylene oligomer, polybutene, ethylene-α-olefin copolymer) with phenol to form alkylphenol, and then adding formaldehyde and polyamine (for example, diethylenetriamine, triethylenetetramine). , Tetraethylenepentamine, pentaethylenehexamine, etc.) can be obtained by reacting them by Mannich reaction.

More specific examples of the polyamine (F-3) include compounds represented by the following general formula (17).
^{_{R 26 -NH- (CH 2 CH 2}} NH) n -H (17)

In the general formula (17), R ²⁶ represents an alkyl group or an alkenyl group having 40 to 400 carbon atoms, preferably 60 to 350, and m represents an integer of 1 to 5, preferably 2 to 4.

  The polyamine is, for example, chlorinated polyolefin (for example, propylene oligomer, polybutene, ethylene-α-olefin copolymer, etc.) and then ammonia or polyamine (for example, ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepenta). Min, pentaethylenehexamine, etc.).

  Although the nitrogen content in the nitrogen compound is arbitrary, from the viewpoints of wear resistance, oxidation stability, friction characteristics, etc., the nitrogen content is usually preferably 0.01 to 10% by mass, more preferably. It is desirable to use 0.1 to 10% by mass.

  Examples of the derivative of the nitrogen compound include those having 2 to 30 carbon atoms such as monocarboxylic acid having 2 to 30 carbon atoms (fatty acid, etc.), oxalic acid, phthalic acid, trimellitic acid, and pyromellitic acid. A so-called acid-modified compound in which a part or all of the remaining amino group and / or imino group is neutralized or amidated by the action of polycarboxylic acid; A so-called boron-modified compound obtained by neutralizing or amidating a part or all of the amino group and / or imino group; a sulfur-modified compound obtained by allowing a sulfur compound to act on the nitrogen compound; and an acid on the nitrogen compound And a modified compound in which two or more kinds of modifications selected from modification, boron modification, and sulfur modification are combined.

  When the ashless dispersant is included in the lubricating oil composition for a drive transmission device of the present invention, the content is not particularly limited, but is preferably 0.5 to 10.0% by mass based on the total amount of the composition, It is more preferably 1 to 8.0% by mass. When the content of the ashless dispersant is less than 0.5% by mass, the effect of improving fatigue life and extreme pressure is insufficient, and when it exceeds 10.0% by mass, the low-temperature fluidity of the composition is greatly increased. Since it deteriorates, each is not preferable. Further, when the lubricating oil composition for a drive transmission device of the present invention is used as a lubricating oil for an automatic transmission or a continuously variable transmission, the content of the ashless dispersant is 1 on the basis of the total amount of the composition. It is preferable to set it as -6 mass%. Further, when the lubricating oil composition for a drive transmission device of the present invention is used particularly as a lubricating oil for a manual transmission, the content of the ashless dispersant is 0.5 to 6% by mass based on the total amount of the composition. It is preferable to set it as 0.5 to 2 mass%.

  Moreover, it is preferable that the lubricating oil composition for a drive transmission device of the present invention further contains a metallic detergent from the viewpoint of further improving the friction characteristics. Specific examples of the metallic detergent include alkaline earth metal sulfonate, alkaline earth metal phenate and alkaline earth metal salicylate, and one or more kinds of metallic detergents selected from these can be mentioned. An agent can be used.

  More specifically, the alkaline earth metal sulfonate is an alkaline earth metal salt of an alkyl aromatic sulfonic acid obtained by sulfonating an alkyl aromatic compound having a molecular weight of 100 to 1500, preferably 200 to 700, for example. Can be mentioned. Particularly preferred are magnesium salts and / or calcium salts. Specific examples of the alkyl aromatic sulfonic acid include so-called petroleum sulfonic acid and synthetic sulfonic acid.

  As the petroleum sulfonic acid, those obtained by sulfonating an alkyl aromatic compound of a lubricating oil fraction of mineral oil or so-called mahoganic acid which is produced as a by-product when white oil is produced is used. As the synthetic sulfonic acid, for example, an alkylbenzene having a linear or branched alkyl group obtained as a by-product from an alkylbenzene production plant that is a raw material for detergents or by alkylating polyolefin with benzene is used as a raw material. , Sulfonated ones thereof, sulfonated ones of dinonylnaphthalene, and the like are used. Further, as the sulfonating agent for these alkyl aromatic compounds, for example, fuming sulfuric acid or sulfuric acid is used.

  More specifically, the alkaline earth metal phenate is an alkylphenol having at least one linear or branched alkyl group having 4 to 30 carbon atoms, preferably 6 to 18 carbon atoms, and reacting the alkylphenol with sulfur. Or an alkaline earth metal salt of a Mannich reaction product of alkylphenol obtained by reacting the alkylphenol with formaldehyde. Particularly preferred are magnesium salts and / or calcium salts.

  More specifically, the alkaline earth metal salicylate is an alkaline earth metal salt of an alkyl salicylic acid having at least one linear or branched alkyl group having 4 to 30 carbon atoms, preferably 6 to 18 carbon atoms. Can be mentioned. Particularly preferred are magnesium salts and / or calcium salts.

  The alkaline earth metal sulfonate, alkaline earth metal phenate and alkaline earth metal salicylate have alkyl aromatic sulfonic acid, alkylphenol, alkylphenol sulfide, alkylphenol as long as the total base number is in the range of 20 to 450 mgKOH / g. The Mannich reaction product, alkylsalicylic acid, or the like directly reacts with an alkaline earth metal base such as an alkaline earth metal oxide or hydroxide of magnesium and / or calcium, or once such as sodium salt or potassium salt. Not only neutral salts (normal salts) obtained by replacing alkali metal salts with alkaline earth metal salts, but also neutral salts (normal salts) and excess alkaline earth metal salts or alkaline earths. Metal bases (alkali earth metal hydroxides and oxidations) ) In the presence of water, or an overbased salt obtained by reacting a neutral salt (normal salt) with an alkaline earth metal base in the presence of carbon dioxide ( Superbasic salts) are also included. These reactions are usually performed in a solvent (an aliphatic hydrocarbon solvent such as hexane, an aromatic hydrocarbon solvent such as xylene, a light lubricant base oil, or the like). In addition, metallic detergents are usually marketed in a state diluted with a light lubricating base oil or the like, and are also available, but generally the metal content is 1.0 to 20% by mass, It is desirable to use 2.0 to 16% by mass.

  When the metal detergent is contained in the lubricating oil composition for a drive transmission device of the present invention, the content thereof is not particularly limited, but is preferably 0.005 to 0.00 on a metal element basis on the basis of the total amount of the composition. 5 mass%, More preferably, it is 0.008-0.3 mass%, More preferably, it is 0.01-0.2 mass%. When the content of the metal detergent is less than 0.005% by mass in terms of metal element, the effect of improving the friction characteristics tends to be insufficient, whereas when the content exceeds 0.5% by mass, it becomes a friction material for wet clutches. There are concerns about the adverse effects of Further, when the lubricating oil composition for a drive transmission device of the present invention is used as a lubricating oil for an automatic transmission or a continuously variable transmission, the content of the metallic detergent is based on the total amount of the composition. In terms of a metal element, the content is preferably 0.005 to 0.2% by mass, and more preferably 0.008 to 0.02% by mass. In addition, when using the lubricating oil composition for a drive transmission device of the present invention, particularly as a lubricating oil for a manual transmission, the content of the metal-based detergent, based on the total amount of the composition, in terms of metallic elements, It is preferable to set it as 0.05-0.5 mass%, It is more preferable to set it as 0.1-0.4 mass%, It is still more preferable to set it as 0.2-0.35 mass%.

  Moreover, it is preferable that the lubricating oil composition for a drive transmission device of the present invention contains an antioxidant from the viewpoint that the thermal and oxidation stability can be further improved. As the antioxidant, any one generally used in the lubricating oil field can be used, but it is preferable to use a phenol-based antioxidant and / or an amine-based antioxidant, and a phenol-based antioxidant. It is particularly preferable to use an agent and an amine-based antioxidant in combination.

  Specific examples of the antioxidant include alkylphenols such as 2-6-di-tert-butyl-4-methylphenol, methylene-4,4-bisphenol (2,6-di-tert-butyl-4- Bisphenols such as methylphenol), naphthylamines such as phenyl-α-naphthylamine, dialkyldiphenylamines, (3,5-di-tert-butyl-4-hydroxyphenyl) fatty acid (propionic acid etc.) or (3-methyl- 5-tertbutyl-4-hydroxyphenyl) fatty acid (propionic acid, etc.) and mono- or polyhydric alcohols such as methanol, octanol, octadecanol, 1,6 hexadiol, neopentyl glycol, thiodiethylene glycol, triethylene glycol, Process with pentaerythritol, etc. Tel and the like. Further, zinc dialkyldithiophosphates such as zinc di-2-ethylhexyldithiophosphate may be used as an antioxidant.

  In the present invention, one kind or two or more kinds of compounds arbitrarily selected from the above antioxidants can be contained in any amount. The content of the antioxidant is not particularly limited, but is preferably 0.01 to 5.0% by mass based on the total amount of the composition.

  Moreover, it is preferable that the lubricating oil composition for a drive transmission device of the present invention further contains a friction modifier from the viewpoint that the friction characteristics of the wet clutch in the transmission can be further improved. As the friction modifier, any compound usually used as a friction modifier in the lubricating oil field can be used, but an alkyl group or alkenyl group having 6 to 30 carbon atoms, particularly a linear alkyl group having 6 to 30 carbon atoms. Alternatively, amine compounds, imide compounds, fatty acid esters, fatty acid amides, fatty acid metal salts, and the like having at least one linear alkenyl group in the molecule are preferably used.

  Examples of the amine compound include linear or branched, preferably linear aliphatic monoamines having 6 to 30 carbon atoms, linear or branched, preferably linear aliphatic polyamines, or fatty acids thereof. An alkylene oxide adduct of a group amine can be exemplified. Examples of the imide compound include a succinimide having a linear or branched alkyl group or alkenyl group having 6 to 30 carbon atoms and / or a modified compound thereof using carboxylic acid, boric acid, phosphoric acid, sulfuric acid, or the like. . Examples of fatty acid esters include esters of linear or branched, preferably linear, fatty acids having 7 to 31 carbon atoms with aliphatic monohydric alcohols or aliphatic polyhydric alcohols. Examples of fatty acid amides include amides of linear or branched, preferably linear fatty acids having 7 to 31 carbon atoms, and aliphatic monoamines or aliphatic polyamines. Examples of the fatty acid metal salt include an alkaline earth metal salt (magnesium salt, calcium salt, etc.) or zinc salt of a linear or branched, preferably linear fatty acid having 7 to 31 carbon atoms.

  In the present invention, among these, it is preferable to contain one or two selected from amine-based friction modifiers, ester-based friction modifiers, amide-based friction modifiers, fatty acid-based friction modifiers, and fatigue. It is particularly preferable to contain one or more selected from amine-based friction modifiers, fatty acid-based friction modifiers, and amide-based friction modifiers in that the life can be further improved. Further, when the lubricating oil composition for a drive transmission device of the present invention is used as a lubricating oil for an automatic transmission or a continuously variable transmission, an imide-based friction modifier can be remarkably improved in a shudder prevention life. It is particularly preferable to contain.

  In the present invention, one or two or more compounds arbitrarily selected from the above friction modifiers can be contained in an arbitrary amount. The content of the friction modifier is preferably 0.01 to 5.0% by mass, more preferably 0.03 to 3.0% by mass, based on the total amount of the composition. Further, when the lubricating oil composition for a drive transmission device of the present invention is used as a lubricating oil for an automatic transmission or a continuously variable transmission, it is necessary to further improve the friction characteristics. Is preferably 0.5 to 5% by mass, more preferably 2 to 4% by mass, based on the total amount of the composition. Further, when the lubricating oil composition for a drive transmission device of the present invention is used, particularly as a lubricating oil composition for a manual transmission, the content of the friction modifier is 0.1 to 3 based on the total amount of the composition. It is preferable to set it as mass%, and it is more preferable to set it as 0.5-1.5 mass%.

  In the lubricating oil composition for a drive transmission device of the present invention, for the purpose of further improving its performance, if necessary, in addition to the above additives, a corrosion inhibitor, a rust inhibitor, a demulsifier, a metal deactivation You may mix | blend various additives, such as an agent, a pour point depressant, a rubber swelling agent, an antifoamer, and a coloring agent, individually or in combination.

  Examples of the corrosion inhibitor include benzotriazole, tolyltriazole, thiadiazole, and imidazole compounds.

  Examples of the rust inhibitor include petroleum sulfonate, alkylbenzene sulfonate, dinonylnaphthalene sulfonate, alkenyl succinic acid ester, and polyhydric alcohol ester.

  Examples of the demulsifier include polyalkylene glycol nonionic surfactants such as polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, and polyoxyethylene alkyl naphthyl ether.

  Examples of metal deactivators include imidazoline, pyrimidine derivatives, alkylthiadiazoles, mercaptobenzothiazoles, benzotriazoles or derivatives thereof, 1,3,4-thiadiazole polysulfide, 1,3,4-thiadiazolyl-2,5-bis. Examples include dialkyldithiocarbamate, 2- (alkyldithio) benzimidazole, and β- (o-carboxybenzylthio) propiononitrile.

  As the pour point depressant, a known pour point depressant can be arbitrarily selected according to the lubricating base oil. As the pour point depressant, for example, a poly (meth) acrylate pour point having a weight average molecular weight of 50,000 to 300,000, preferably 60,000 to 300,000, particularly preferably 100,000 to 250,000. A depressant is preferably used.

  As the antifoaming agent, any compound usually used as an antifoaming agent in the lubricating oil field can be used, and examples thereof include silicones such as dimethyl silicone and fluorosilicone. One or two or more compounds arbitrarily selected from these can be blended in any amount.

  As the colorant, any compound that is usually used can be used, and any amount can be blended. Usually, the blending amount is 0.001 to 1.0% by mass based on the total amount of the composition. is there.

  When these additives are contained in the lubricating oil composition of the present invention, the content is based on the total amount of the composition, and 0.005 to 5% by mass for each of the corrosion inhibitor, rust inhibitor, and demulsifier, metal 0.005-1 mass% for deactivator, 0.05-1 mass% for pour point depressant, 0.0005-1 mass% for antifoaming agent, 0.001-1.0 mass for colorant. Usually selected in the range of%.

  According to the lubricating oil composition for a drive transmission device of the present invention having the above-described configuration, even when the viscosity is lowered, the wear resistance, seizure resistance and fatigue life can be achieved at a high level over a long period of time. This makes it possible to achieve both fuel saving and durability in the drive transmission device, and further improve the startability at low temperatures. The driving force transmission device to which the lubricating oil composition for the drive transmission device of the present invention can be applied is not particularly limited, but specifically, transmissions such as automatic transmissions, continuously variable transmissions, manual transmissions, and final decelerations. Machine, power distribution / adjustment mechanism, etc. Hereinafter, as preferred embodiments of the present invention, (I) a lubricating oil composition for an automatic transmission or a continuously variable transmission, (II) a lubricating oil composition for a manual transmission, and (III) a lubricating oil for a final reduction gear The composition will be described in detail.

(I) In the lubricating oil composition for automatic transmission or continuously variable transmission, the kinematic viscosity at 100 ° C. of the lubricating base oil according to the present invention is preferably ² to 8 mm ² / s, more preferably 2.6. It is -4.5 mm < ² > / s, More preferably, it is 2.8-4.3 mm < ² > / s, Most preferably, it is 3.3-3.8 mm < ² > / s. When the kinematic viscosity is less than the lower limit, the lubricity tends to be insufficient, and when the upper limit is exceeded, the low temperature fluidity tends to be insufficient.

Moreover, (I) In the lubricating oil composition for automatic transmission or continuously variable transmission, the kinematic viscosity of the lubricating base oil according to the present invention at 40 ° C. is preferably 15 to 50 mm ² / s, more preferably 20 It is -40 mm < ² > / s, More preferably, it is 25-35 mm < ² > / s. When the kinematic viscosity is less than the lower limit value, the lubricity tends to be insufficient, and when the kinematic viscosity exceeds the upper limit value, fuel economy tends to be insufficient due to an increase in stirring resistance.

  In the lubricating oil composition for (I) automatic transmission or continuously variable transmission, the viscosity index of the lubricating base oil according to the present invention is preferably 120 to 160, more preferably 125 to 150, still more preferably. 130-145. When the viscosity index is within the above range, the viscosity-temperature characteristics can be further improved.

  Further, (I) Phosphorus-containing compounds contained in the lubricating oil composition for automatic transmissions or continuously variable transmissions include phosphoric acid, phosphoric esters, phosphorous acid, phosphites, thiophosphoric acid, thiophosphorus It is preferably at least one selected from acid esters, thiophosphorous acid and thiophosphite esters and salts thereof, and phosphoric acid, phosphate esters, phosphorous acid and phosphite esters and the like It is more preferable that it is at least one selected from these salts, and it is even more preferable that it is at least one selected from phosphoric esters and phosphites and salts thereof.

  Further, (I) the content of the phosphorus-containing compound in the lubricating oil composition for automatic transmission or continuously variable transmission is preferably 0.005 to 0.1 mass in terms of phosphorus element based on the total amount of the composition. %, More preferably 0.01-0.05 mass%, still more preferably 0.02-0.04 mass%. When the content of the phosphorus-containing compound is less than the lower limit, the lubricity tends to be insufficient, and when the content exceeds the upper limit, the wet friction characteristics and the fatigue life tend to be insufficient.

  Further, (I) the BF viscosity at −40 ° C. of the lubricating oil composition for automatic transmission or continuously variable transmission is preferably 20,000 mPa · s or less, more preferably 15,000 mPa · s or less, and still more preferably. It is 10,000 mPa · s or less, more preferably 8,000 mPa · s or less, and particularly preferably 7,000 mPa · s or less. If the BF viscosity exceeds the upper limit, the startability at low temperatures tends to be insufficient.

  The viscosity index of the lubricating oil composition for (I) automatic transmission or continuously variable transmission is preferably 100 to 250, more preferably 150 to 250, and still more preferably 170 to 250. If the viscosity index is less than the lower limit, fuel economy tends to be insufficient. Moreover, the composition which exceeds the said upper limit has too much content of a poly (meth) acrylate type viscosity index improver, and exists in the tendency for shear stability to become inadequate.

Further, in the lubricating oil composition for manual transmission (II), the kinematic viscosity at 100 ° C. of the lubricating base oil according to the present invention is preferably 3.0 to ²⁰ mm ² / s, more preferably 3.3 to 15 mm. ² / s, more preferably 3.3 to 8 mm ² / s, still more preferably 3.8 to ⁶ mm ² / s, and particularly preferably 4.3 to 5.5 mm ² / s. When the kinematic viscosity is less than the lower limit, the lubricity tends to be insufficient, and when the upper limit is exceeded, the low temperature fluidity tends to be insufficient.

(II) In the lubricating oil composition for manual transmission, the kinematic viscosity of the lubricating base oil according to the present invention at 40 ° C. is preferably 10 to 200 mm ² / s, more preferably 15 to 80 mm ² / s, More preferably, it is 20-70 mm < ² > / s, Most preferably, it is 23-60 mm < ² > / s. When the kinematic viscosity is less than the lower limit value, the lubricity tends to be insufficient, and when the kinematic viscosity exceeds the upper limit value, fuel economy tends to be insufficient due to an increase in stirring resistance.

  In the lubricating oil composition for manual transmission (II), the viscosity index of the lubricating base oil according to the present invention is preferably 130 to 170, more preferably 135 to 165, and still more preferably 140 to 160. When the viscosity index is within the above range, the viscosity-temperature characteristics can be further improved.

  (II) The phosphorus-containing compound contained in the lubricating oil composition for manual transmission is at least one selected from thiophosphoric acid, thiophosphoric acid esters, thiophosphorous acid, and thiophosphorous acid esters. It is more preferable that it is at least one selected from thiophosphates and thiophosphites, and zinc dithiophosphate is particularly preferable.

  In addition, the content of the phosphorus-containing compound in the (II) lubricating oil composition for manual transmission is preferably 0.01 to 0.2% by mass, more preferably 0, in terms of phosphorus element, based on the total amount of the composition. 0.05 to 0.15 mass%, more preferably 0.09 to 0.14 mass%. If the content of the phosphorus-containing compound is less than the lower limit, lubricity and synchro properties tend to be insufficient, and if the upper limit is exceeded, thermal / oxidative stability and fatigue life tend to be insufficient. It is in.

  Further, (II) BF viscosity at −40 ° C. of the lubricating oil composition for manual transmission is preferably 20,000 mPa · s or less, more preferably 15,000 mPa · s or less, and still more preferably 10,000 mPa · s or less. More preferably, it is 9,000 mPa · s or less, particularly preferably 8,000 mPa · s or less. If the BF viscosity exceeds the upper limit, the startability at low temperatures tends to be insufficient.

  Moreover, (II) The viscosity index of the lubricating oil composition for manual transmission is preferably 100 to 250, more preferably 140 to 250, and still more preferably 150 to 250. If the viscosity index is less than the lower limit, fuel economy tends to be insufficient. Moreover, the composition which exceeds the said upper limit has too much content of a poly (meth) acrylate type viscosity index improver, and exists in the tendency for shear stability to become inadequate.

Moreover, (III) In the lubricating oil composition for a final reduction gear, the kinematic viscosity at 100 ° C. of the lubricating base oil according to the present invention is preferably 3.0 to ²⁰ mm ² / s, more preferably 3.3 to 15 mm. ² / s, more preferably 3.3 to 8 mm ² / s, still more preferably 3.8 to ⁶ mm ² / s, and particularly preferably 4.3 to 5.5 mm ² / s. When the kinematic viscosity is less than the lower limit, the lubricity tends to be insufficient, and when the upper limit is exceeded, the low temperature fluidity tends to be insufficient.

Moreover, in the lubricating oil composition for (III) final reduction gears, the kinematic viscosity of the lubricating base oil according to the present invention at 40 ° C. is preferably 15 to ²⁰⁰ mm ² / s, more preferably 20 to 150 mm ² / s, More preferably, it is 23-80 mm < ² > / s. When the kinematic viscosity is less than the lower limit value, the lubricity tends to be insufficient, and when the kinematic viscosity exceeds the upper limit value, fuel economy tends to be insufficient due to an increase in stirring resistance.

  Moreover, (III) In the lubricating oil composition for a final reduction gear, the viscosity index of the lubricating base oil according to the present invention is preferably 130 to 170, more preferably 135 to 165, and still more preferably 140 to 160. When the viscosity index is within the above range, the viscosity-temperature characteristics can be further improved.

  (III) The phosphorus-containing compound contained in the lubricating oil composition for the final reduction gear is selected from phosphoric esters, phosphites, thiophosphates, thiophosphites, and salts thereof. At least one selected from phosphoric esters, phosphites and amine salts thereof, and more preferably phosphites, amine salts and phosphoric acid thereof More preferably, it is at least one selected from esters.

  In addition, the content of the phosphorus-containing compound in the (III) lubricating oil composition for the final reduction gear is preferably 0.01 to 0.2% by mass, more preferably 0, in terms of phosphorus element, based on the total amount of the composition. 0.05 to 0.15 mass%, more preferably 0.1 to 0.14 mass%. When the content of the phosphorus-containing compound is less than the lower limit, the lubricity tends to be insufficient, and when the content exceeds the upper limit, the fatigue life tends to be insufficient.

  Further, (III) the BF viscosity at −40 ° C. of the lubricating oil composition for the final reduction gear is preferably 100,000 mPa · s or less, more preferably 50,000 mPa · s or less, and further preferably 20,000 mPa · s or less. More preferably, it is 10,000 mPa · s or less. If the BF viscosity exceeds the upper limit, the startability at low temperatures tends to be insufficient.

  The viscosity index of the lubricating oil composition for (III) automatic transmission or continuously variable transmission is preferably 100 to 250, more preferably 120 to 250, and still more preferably 125 to 250. If the viscosity index is less than the lower limit, fuel economy tends to be insufficient. Moreover, the composition which exceeds the said upper limit has too much content of a poly (meth) acrylate type viscosity index improver, and exists in the tendency for shear stability to become inadequate.

  EXAMPLES Hereinafter, although this invention is demonstrated more concretely based on an Example and a comparative example, this invention is not limited to a following example at all.

[Manufacture of lubricating base oil]
(Base oils 1-3)
The fraction separated by vacuum distillation in the step of refining the solvent refined base oil was subjected to hydrogenation after solvent extraction with furfural and then dewaxed with a methyl ethyl ketone-toluene mixed solvent. The wax removed during the solvent dewaxing (hereinafter referred to as “WAX1”) was used as a raw material for the lubricating base oil. Table 1 shows the properties of WAX1.

Next, hydrocracking of WAX1 was performed under the conditions of a hydrogen partial pressure of 5 MPa, an average reaction temperature of 350 ° C., and LHSV1hr ⁻¹ in the presence of a hydrocracking catalyst. As the hydrocracking catalyst, a catalyst in which 3% by mass of nickel and 15% by mass of molybdenum were supported on an amorphous silica / alumina carrier (silica: alumina = 20: 80 (mass ratio)) was used in a sulfurized state.

  Next, 26% by volume of the lubricating oil fraction was obtained by distillation under reduced pressure of the decomposition product obtained by the above hydrocracking. This lubricating oil fraction was subjected to solvent dewaxing using a methyl ethyl ketone-toluene mixed solvent under the conditions of a solvent / oil ratio of 4 times and a filtration temperature of -25 ° C. to obtain lubricating base oils having different viscosity grades (base oil 1, Base oil 2 and base oil 3) were obtained. Table 2 shows various properties and performance evaluation test results for each lubricating base oil.

[Example 1, Reference Example 1 , Comparative Examples 1-3: Preparation of lubricating oil composition for automatic transmission]
In Example 1 and Reference Example 1 , a lubricating oil composition having the composition shown in Table 3 was prepared using the above base oils 1 and 2, and the following base oil 4 and additives A1, A2, B1, and C1. did. In Comparative Examples 1 to 3, lubricating oil compositions having the compositions shown in Table 4 were prepared using the following base oils 4 to 6 and additives A1, A2, B1, and C1. Table 2 shows various properties and evaluation test results of the base oils 5 and 6. Tables 3 and 4 show the kinematic viscosity, viscosity index, and phosphorus content at 40 ° C. of the obtained lubricating oil composition.
(Base oil)
Base oil 4: paraffinic solvent refined base oil (saturated content: 60.1% by mass, aromatic content: 35.7% by mass, resin content: 4.2% by mass, sulfur content: 0.51% by mass, 100 ° C. Kinematic viscosity at 32 m
m ² / s, viscosity index: 95)
Base oil 5: Paraffin hydrocracking base oil base 6: Paraffin hydrocracking base oil (viscosity index improver)
A1: Non-dispersed polymethacrylate (R ¹ in the general formula (4) is a methyl group and has 12 carbon atoms)
A copolymer of a monomer mixture mainly comprising a monomer having a linear alkyl group of ˜15, weight average molecular weight: 20,000)
A2: Dispersed polymethacrylate (R ¹ in the general formula (4) is a methyl group, has 12 carbon atoms,
A monomer having a linear alkyl group of 14, 16, 18 as a main component, and represented by the general formula (5) or (6
A copolymer of a monomer mixture containing a nitrogen-containing monomer represented by the formula:
000)
(Phosphorus-containing compound)
B1: Mixture of phosphorous acid and phosphite (package additive)
C1: Package additive (addition amount to lubricating oil composition 12.0% by mass, in lubricating oil composition, ashless dispersant: 4.0% by mass, alkaline earth metal sulfonate: 0.01% by mass (alkaline earth Metal element equivalent value), corrosion inhibitor: 0.1% by mass, antioxidant: 0.2% by mass, friction modifier: 3.5% by mass, rubber swelling agent: 1.0% by mass, antifoaming agent : 0.003 mass%, diluent: balance).

Next, the following evaluation tests were performed using the lubricating oil compositions for automatic transmissions of Example 1, Reference Example 1 and Comparative Examples 1 to 3.

[Low temperature fluidity test]
In accordance with ASTM D 2983, the BF viscosity at −40 ° C. of each lubricating oil composition was measured. The obtained results are shown in Tables 3 and 4. In this test, the smaller the value of the BF viscosity, the better the low temperature fluidity.

[Shear stability test]
In accordance with JASO M347-95, an ultrasonic shear test was performed under the following conditions, and the kinematic viscosity at 100 ° C. of each lubricating oil composition after the test was measured. The obtained results are shown in Tables 3 and 4. In this test, the smaller the decrease in viscosity after being subjected to ultrasonic shearing, the higher the kinematic viscosity at 100 ° C., the better the shear stability.
(Test conditions)
Test oil volume: 30ml
Ultrasonic frequency: 10 kHz
Test oil temperature: 40 ° C
Test time: 1 hour.

[Abrasion resistance test]
In accordance with JPI-5S-32-90, a quaternary test was performed under the following conditions, and the wear scar diameter after the test was measured. The obtained results are shown in Tables 3 and 4. In this test, the smaller the wear scar diameter, the better the wear resistance.
(Test conditions)
Rotation speed: 1800rpm
Load: 392N
Test oil amount: 75 ° C
Test time: 1 hour.

[Thermal and oxidation stability test]
First, the acid value of each lubricating oil composition was measured. Next, in accordance with JIS K 2514, each lubricating oil composition was forcibly deteriorated under conditions of 150 ° C. and 144 hours at ISOT, and the acid value thereof was measured. The increase was determined. The obtained results are shown in Tables 3 and 4. In this test, the smaller the increase in acid value, the better the thermal and oxidation stability.

[Example 2 , Comparative Examples 4, 5: Preparation of lubricating oil composition for manual transmission]
In Example 2 , a lubricating oil composition having the composition shown in Table 5 was prepared using the above base oils 2 and 3 and additive A1, and the following additives A3, B2 and C2. In Comparative Examples 4 and 5, the composition shown in Table 5 using the base oil 6 and additive A1 shown in Table 2 and the base oil 7 and additives A3, B2 and C2 shown in Table 2 above. A lubricating oil composition having was prepared. Table 5 shows the kinematic viscosity, viscosity index, and phosphorus content of the obtained lubricating oil composition at 40 ° C.
(Viscosity index improver)
A3: Non-dispersed polymethacrylate (a copolymer of a monomer mixture mainly composed of a monomer in which R ¹ in the general formula (4) is a methyl group and a linear alkyl group having 12, 14, 16, 18 carbon atoms, weight (Average molecular weight: 50,000)
(Phosphorus-containing compound)
B2: zinc dialkyldithiophosphate (mixture of Pri-ZDTP and Sec-ZDTP) (package additive)
C2: Package additive (amount added to lubricant composition: 6.8% by mass, in lubricating oil composition, alkaline earth metal sulfonate: 0.25% by mass (converted to alkaline earth metal element), corrosion prevention Agent: 0.1% by mass, Antioxidant: 0.5% by mass, Friction modifier: 1.0% by mass, Rubber swelling agent: 0.5% by mass, Antifoaming agent: 0.001% by mass, Diluent : The rest).

Next, the lubricating oil compositions for manual transmissions of Example 2 and Comparative Examples 4 and 5 are the same as those of the lubricating oil compositions for automatic transmissions of Example 1, Reference Example 1 and Comparative Examples 1 to 3. Tests were conducted to evaluate low-temperature fluidity, shear stability, and wear resistance. The results obtained are shown in Table 5.

Claims (2)

A lubricating base oil containing 90% by mass or more of a saturated component and having a cyclic saturated component in the saturated component of 10 to 40% by mass and satisfying the condition represented by the following formula (1);
A poly (meth) acrylate viscosity index improver;
A lubricating oil composition for a drive transmission device, comprising a phosphorus-containing compound.
1.440 ≦ n ₂₀ −0.002 × kv100 ≦ 1.453 (1)
[Wherein n ₂₀ represents the refractive index of the lubricating base oil at 20 ° C., and kv100 represents the kinematic viscosity (mm ² / s) of the lubricating base oil at 100 ° C. ] The lubricating oil composition for a drive transmission device according to claim 1, wherein the aromatic base oil has an aromatic content of 2.4 to 5 mass%.