JP3476942B2 - Lubricating oil composition - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to lubricating oil compositions. More specifically, the present invention is a novel lubricating oil which can be suitably used as a lubricating oil for an internal combustion engine, an automatic transmission, a shock absorber, a power steering, etc., which is excellent in low friction and low wear resistance, particularly as a lubricating oil for an internal combustion engine. It relates to an oil composition.

[0002]

2. Description of the Related Art Lubricating oil is used in internal combustion engines, automatic transmissions, shock absorbers, drive system devices such as power steering, gears, etc. in order to ensure smooth operation. In particular, lubricating oil for internal combustion engines is mainly used for piston rings and cylinder liners, bearings for crankshafts and connecting rods,
In addition to lubrication of various sliding parts such as valve mechanism including cam and valve lifter, it also functions to cool the engine, cleanly disperse combustion products, and prevent rust and corrosion.
As described above, lubricating oils for internal combustion engines are required to have various performances, and in recent years, high performances have been required as the performances, output power, and operating conditions of internal combustion engines have become more severe. . Therefore, various additives such as antiwear agents, metal detergents, ashless dispersants, and antioxidants are blended with lubricating oils for internal combustion engines in order to satisfy such required performance. As a basic function of a lubricating oil for an internal combustion engine, it is important to operate the engine smoothly under all conditions to prevent wear and seizure. Although most of the engine lubrication part is in fluid lubrication, boundary lubrication is likely to occur at valve operating systems and top and bottom dead centers of pistons, and wear resistance under such boundary lubrication is generally zinc dithiophosphate. And added by the addition of zinc dithiocarbamate. In an internal combustion engine, since a large amount of energy is lost in a friction portion where lubricating oil is involved, a lubricating oil in which various additives such as a friction modifier are combined is used as a measure for reducing friction loss and fuel consumption. As a friction modifier,
For example, molybdenum compounds, extreme pressure agents such as phosphoric acid esters, and oily agents such as fatty acid esters and alkylamines are generally used. However, while further improvement in fuel consumption is required in response to exhaust gas regulations, at present, the performance thereof is insufficient, and a lubricating oil composition having further low friction property is required in the market. On the other hand, from the viewpoint of energy saving, the weight reduction of the automobile body is promoted and the crankcase tends to be downsized for the purpose of improving fuel efficiency. Therefore, the amount of lubricating oil for the internal combustion engine in the crankcase is reduced, and the heat load per unit amount of oil is increased. Furthermore, the operating conditions of internal combustion engines have become more severe due to higher engine output and higher speeds. Therefore, for the purpose of further improving the heat resistance of the lubricating oil for internal combustion engines, a lubricating oil composition in which a poly-α-olefin is mixed with a polyol ester has been proposed (Japanese Patent Laid-Open No. 64-79299).
However, although this composition has improved cleanability at high temperatures, the effect of reducing friction is not sufficient.

[0003]

SUMMARY OF THE INVENTION The present invention has been made for the purpose of providing a lubricating oil composition having excellent low friction properties, which is suitable as a lubricating oil for internal combustion engines of automobiles.

[0004]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventor has found that a base oil composed of poly-α-olefin and a carbonic acid ester, dicarboxylic acid ester or alkylbenzene of a specific structure is obtained. On the other hand, a lubricating oil composition comprising a sulfurized oxymolybdenum dithiocarbamate having a specific hydrocarbon group and a zinc dialkyldithiophosphate having a specific alkyl group in a specific ratio is extremely effective in reducing friction. The present invention has been completed based on this finding. That is, the present invention provides (A) poly-α-olefins 15 to 9 having a kinematic viscosity at 100 ° C. of 2 to 20 cSt.
9.9% by weight, and (B) carbonate represented by the general formula [1]

[Chemical 2] (However, in the formula, R ¹ and R ² are alkyl groups having 8 to 22 carbon atoms, and they may be the same or different from each other.) Or, the kinematic viscosity at 100 ° C. is 3 to 40.
With respect to the base oil consisting of 85 to 0.1% by weight of alkylbenzene which is cSt, (C) a sulfurized oxymolybdenum dithiocarbamate having a hydrocarbon group having 8 to 18 carbon atoms, and (D) an alkyl group having 1 carbon atom A lubricating oil composition comprising:
Based on the total amount of the composition, the amount of molybdenum derived from sulfurized oxymolybdenum dithiocarbamate is 200 to 1200.
ppm (weight ratio), and the amount of phosphorus derived from zinc dialkyldithiophosphate is 400 to 1500 ppm (weight ratio), to provide a lubricating oil composition.

In the lubricating oil composition of the present invention, poly-α-olefin is used as the component (A) constituting the base oil. Examples of the α-olefin as a raw material for the poly-α-olefin include ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-heptene, and 1-heptene.
Examples include -octene, 1-nonene, 1-decene, 1-undecene, 1-dodecene, 1-tridecene, 1-tetradecene, 1-pentadecene and 1-hexadecene. These α-olefins can be homopolymerized by using one kind, or can be copolymerized by using two or more kinds. The method for polymerizing the α-olefin is not particularly limited, and for example, it can be carried out using a Ziegler catalyst or a radical polymerization catalyst. The poly-α-olefin used in the lubricating oil composition of the present invention has a kinematic viscosity of 2 at 100 ° C.
˜20 cSt, more preferably 3 to 8 cSt. The kinematic viscosity of various base oils such as poly-α-olefins and products can be measured according to JIS K 2283. If the kinematic viscosity of the poly-α-olefin at 100 ° C is less than 2 cSt, the effect of improving the friction coefficient may not be sufficiently exhibited. When the kinematic viscosity of the poly-α-olefin at 100 ° C. exceeds 20 cSt,
The coefficient of friction may increase.

In the lubricating oil composition of the present invention, the carbonate ester represented by the general formula [1] is used as the component (B) constituting the base oil.

[Chemical 5] (However, in the formula, R ¹ and R ² are alkyl groups having 8 to 22 carbon atoms, and they may be the same or different from each other.), The dicarboxylic acid ester represented by the general formula [2].

[Chemical 6] (However, in the formula, R ³ and R ⁴ are alkyl groups having 8 to 22 carbon atoms, and they may be the same or different from each other, and R ⁵ is an alkylene group having 4 to 16 carbon atoms.),
Also, one or more compounds selected from alkylbenzenes having a kinematic viscosity at 100 ° C. of 3 to 40 cSt are used. Examples of the alkyl group having 8 to 22 carbon atoms represented by R ¹ and R ² of the carbonic acid ester represented by the general formula [1] include an octyl group, a nonyl group, a decyl group, an undecyl group, a dodecyl group, a tridecyl group, Tetradecyl group, pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group, nonadecyl group, icosyl group, henicosyl group,
Examples thereof include docosyl group, and these alkyl groups may be linear or branched. General formula [1]
The carbon number of the alkyl group represented by R ¹ and R ² of the carbonic acid ester represented by is more preferably 12 to 22. If the carbon number of the alkyl groups R ¹ and R ² of the carbonic acid ester represented by the general formula [1] is less than 8, the viscosity of the base oil may be low and the effect of improving the friction characteristics may not be sufficiently exerted. When the carbon number of R ¹ and R ² exceeds 22,
The base oil may have a high viscosity and a high friction coefficient.

Examples of the alkyl group having 8 to 22 carbon atoms represented by R ³ and R ⁴ of the dicarboxylic acid ester represented by the general formula [2] include an octyl group, a nonyl group, a decyl group, an undecyl group and a dodecyl group. , Tridecyl group, tetradecyl group,
Examples thereof include a pentadecyl group, a hexadecyl group, a heptadecyl group, an octadecyl group, a nonadecyl group, an icosyl group, a henicosyl group, and a docosyl group, and these alkyl groups may be linear or branched. The carbon number of the alkyl group represented by R ³ and R ⁴ of the dicarboxylic acid ester represented by the general formula [2] is more preferably 12-22. When the number of carbon atoms of the alkyl groups R ³ and R ⁴ of the dicarboxylic acid ester represented by the general formula [2] is less than 8, the viscosity of the base oil may be low and the effect of improving the friction characteristics may not be sufficiently exhibited. If the alkyl groups R ¹ and R ² have more than 22 carbon atoms, the viscosity of the base oil may be high and the friction coefficient may be high. Examples of the alkylene group having 4 to 16 carbon atoms represented by R ⁵ of the dicarboxylic acid ester represented by the general formula [2] include butylene group, pentylene group, hexylene group, heptylene group, octylene group, nonylene group and decylene group. , Undecylene group, dodecylene group, tridecylene group, tetradecylene group, pentadecylene group, hexadecylene group, and these alkylene groups may be linear or branched. When the number of carbon atoms of the general formula [2] alkylene group of the dicarboxylic acid ester R ⁵ represented by is less than 4, there is a possibility that the effect of improving the frictional properties low viscosity of the base oil is not sufficiently exhibited, an alkylene group R ⁵ If the number of carbon atoms in the base oil exceeds 16, the viscosity of the base oil may be high and the friction coefficient may be high. The alkylbenzene used in the lubricating oil composition of the present invention has a viscosity index of -50 to 8
It is 0, and preferably −45 to −20 (from the viewpoint of oxidation stability). Kinematic viscosity at 100 ° C is 2-30
cSt, more preferably 3 to 20 cSt. When the viscosity index of alkylbenzene is less than -50, it may be difficult to maintain an appropriate viscosity over the entire temperature range used. Also, 100 of alkylbenzene
If the kinematic viscosity at 0 ° C is less than 2 cSt, the viscosity of the base oil may be low, and the effect of improving the frictional properties may not be sufficiently exhibited. If the kinematic viscosity of alkylbenzene at 100 ° C exceeds 30 cSt, the viscosity of the base oil will be high. The coefficient of friction may increase. In the lubricating oil composition of the present invention,
The weight ratio of the component (A) and the component (B) constituting the base oil is 1
5:85 to 99.9: 0.1, preferably 50: 5
It is 0-99.5: 0.5. When the weight ratio of the component (A) and the component (B) is larger than 99.9: 0.1 and the amount of the component (B) is small, the synergistic effect with the additive for reducing friction is not exhibited, and the component (A) and If the weight ratio of the component (B) is smaller than 15:85 and the amount of the component (B) is large, the effect of inhibiting the adsorption of the additive is increased, and in any case, the friction coefficient is the same as when the component (B) is not added. The result is not so different. Further, the viscosity of the mixed base oil is 2 to 10 cSt, preferably wear characteristics,
It is 3 to 7 cSt from the viewpoint of viscous resistance.

The sulfurized oxymolybdenum dithiocarbamate used as the component (C) in the lubricating oil composition of the present invention has the general formula [3]

[Chemical 7] (However, in the formula, each of R ⁶ and R ⁷ has 8 to 18 carbon atoms.
, Which may be the same or different, and m and n are positive integers such that their sum is 4. ) Is a compound represented by.
Examples of the hydrocarbon group having 8 to 18 carbon atoms represented by R ⁶ and R ⁷ in the general formula [3] include, for example, 8 to 1 carbon atoms.
Hydrocarbon groups such as an alkyl group having 8 to 18 carbon atoms, an alkenyl group having 8 to 18 carbon atoms, a cycloalkyl group having 8 to 18 carbon atoms, an aryl group having 8 to 18 carbon atoms, an alkylaryl group, and an arylalkyl group can be exemplified. . The alkyl group or alkenyl group may be linear or branched. Examples of the hydrocarbon group represented by R ⁶ and R ⁷ in the general formula [3] include, for example, an octyl group, a nonyl group,
Decyl group, undecyl group, dodecyl group, tridecyl group,
Octenyl, nonenyl, decenyl, undecenyl, dodecenyl, tridecenyl, tetradecenyl, hexadecenyl, octadecenyl, dimethylcyclohexyl, ethylcyclohexyl, methylcyclohexylmethyl, cyclohexylethyl, propylcyclohexyl, butylcyclohexyl Group, heptylcyclohexyl group, dimethylphenyl group, methylbenzyl group, phenethyl group, naphthyl group, dimethylnaphthyl group and the like. In the composition of the present invention, the hydrocarbon group represented by R ⁶ and R ⁷ has 8 carbon atoms.
Is particularly preferable. In the lubricating oil composition of the present invention, the sulfurized oxymolybdenum dithiocarbamate is 1
One kind or a combination of two or more kinds can be used. Further, the sulfurized oxymolybdenum dithiocarbamate has an amount of molybdenum derived from the sulfurized oxymolybdenum dithiocarbamate of 200 to 12 based on the total weight of the composition.
It is preferably 300 to 8 so as to be 00 ppm (weight ratio)
Blend so that it will be 00 ppm (weight ratio). When the amount of sulfurized oxymolybdenum dithiocarbamate is less than 200 ppm (weight ratio) of molybdenum derived from sulfurized oxymolybdenum dithiocarbamate based on the total weight of the composition, the effect of improving the friction characteristics is sufficiently exhibited. The amount of molybdenum derived from sulfurized oxymolybdenum dithiocarbamate is 1200 pp based on the total weight of the composition.
If the amount exceeds m (weight ratio), the effect of improving the friction characteristics will not be sufficiently exerted, and sludge, etc., may be easily caused.

The zinc dialkyldithiophosphate used in the lubricating oil composition of the present invention has the general formula [4]

[Chemical 8] (However, in the formula, R ⁸ and R ⁹ are alkyl groups having 1 to 18 carbon atoms, and they may be the same or different from each other.). The alkyl group represented by R ⁸ and R ⁹ in the general formula [4] is
Methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, heptyl group, octyl group, nonyl group,
Decyl group, undecyl group, dodecyl group, tridecyl group,
Examples thereof include a tetradecyl group, a pentadecyl group, a hexadecyl group, a heptadecyl group, and an octadecyl group. These may be linear or branched, but the lubricating oil composition of the present invention has a carbon number of It is more preferable to use zinc dialkyldithiophosphate having 3 to 12 alkyl groups. In the lubricating oil composition of the present invention, zinc dialkyldithiophosphate may be used alone or in combination of two or more. The zinc dialkyldithiophosphate contains 400 to 1500 ppm of phosphorus derived from the zinc dialkyldithiophosphate based on the total weight of the composition.
(Weight ratio), preferably 600 to 1200 pp
Blend so that it will be m (weight ratio). When the amount of zinc dialkyldithiophosphate mixed is such that the amount of phosphorus derived from zinc dialkyldithiophosphate is less than 400 ppm based on the total weight of the composition, the abrasion resistance may be insufficient, resulting in dialkyl When the amount of zinc dithiophosphate mixed is more than 1500 ppm based on the total weight of the composition, the amount of phosphorus derived from zinc dialkyldithiophosphate does not sufficiently bring about the effect of improving the friction characteristics.

In the lubricating oil composition of the present invention, a boron-containing succinimide can be blended if necessary. The boron-to-nitrogen atom ratio in the boron-containing succinimide to be blended is 0.05 to 1.5, preferably 0.0 to 1.5.
It is 1 to 0.8. Boron / nitrogen atomic ratio of 0.05
If it is less than 1.5 or more than 1.5, sufficient improvement in frictional properties may not be obtained. In the lubricating oil composition of the present invention, an overbased metal sulfonate can be blended if necessary. Examples of the metal include calcium, barium, magnesium, etc. Among them, overbased calcium sulfonate is preferable. Overbased calcium sulfonate has a good cleansing and dispersing effect. Further, the range of overbasing is preferably 280 mgKOH / g or more in terms of total base number. In the lubricating oil composition of the present invention, an antioxidant can be added if necessary. Examples of the antioxidant include amine-based antioxidants such as alkylated diphenylamine, phenyl-α-naphthylamine and alkylated-α-naphthylamine, 2,6-di-t-butyl-4-methylphenol, 4,4 Examples thereof include phenolic antioxidants such as'-methylenebis (2,6-di-t-butylphenol), and usually 0.05
Used at a rate of ~ 2% by weight. In the lubricating oil composition of the present invention, an antifoaming agent can be added if necessary. Examples of the defoaming agent include dimethylpolysiloxane and polyacrylic acid, which are usually 0.0
It is used in a proportion of 01 to 0.05% by weight. In the lubricating oil composition of the present invention, a viscosity index improver can be blended if necessary. Examples of the viscosity index improver include polymethacrylate-based, polyisobutylene-based, ethylene-propylene copolymer system, styrene-butadiene hydrogenated copolymer system and the like, and these are usually 0.5-0.5.
Used in a proportion of 35% by weight.

The lubricating oil composition of the present invention contains various additives conventionally used in lubricating oils, such as other metallic detergents and other friction modifiers, as long as the object of the present invention is not impaired.
Pour point depressants, other anti-wear agents, rust preventives, corrosion inhibitors and the like can be appropriately added. As a metallic detergent,
For example, calcium sulfonate, magnesium sulfonate, barium sulfonate, calcium phenate, barium phenate, calcium salicylate, magnesium salicylate and the like can be mentioned, and these are usually used in a proportion of 0.1 to 5% by weight. As the friction modifier, for example, polyhydric alcohol partial ester, amine,
Examples include amides and sulfurized esters. Examples of the pour point depressant include polyalkylmethacrylate, chlorinated paraffin-naphthalene condensate, alkylated polystyrene and the like. Examples of the antiwear agent include metal salts of thiophosphoric acid, metal salts of thiocarbamic acid, sulfur compounds, phosphoric acid esters, phosphorous acid esters, etc., and these are usually 0.05 to 5.0% by weight. Used in proportion. Examples of the rust preventive include fatty acid, alkenyl succinic acid half ester, fatty acid soap, alkyl sulfonate, fatty acid polyhydric alcohol ester, fatty acid amine, oxidized paraffin, alkyl polyoxyethylene ether and the like. Examples of the corrosion inhibitor include benzotriazole and benzimidazole. The product containing the base oil and the additive has a kinematic viscosity of 2 to 20 cSt, preferably 4 to 12 cSt from the viewpoint of wear characteristics and viscous resistance.

[0012]

The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples. The coefficient of friction of the lubricating oil composition was measured using an LFW-1 friction tester with a sliding speed of 1400.
It was measured at rpm, load 40 pounds, oil temperature 80 ° C., test time 20 minutes. Examples 1 to 3 (however, Example 2 is a reference example) and Comparative Example 1
-3 The base oil and additive shown in Table 1 were blended to prepare a lubricating oil composition having a kinematic viscosity at 100 ° C of 8.8 cSt. A friction test was conducted on these lubricating oil compositions to obtain the friction coefficient values shown in Table 1. The components of the base oil and the additives shown in each table below are as follows. Poly-α-olefin: 10 containing 1-decene as a main component
0 kinematic viscosity at ° C. is 4 cSt _{C 14} - carbonate: di -n- tetradecyl carbonate _{C 18} - dicarboxylic acid esters: di -n- octadecyl sebacate alkylbenzene: kinematic viscosity at a viscosity index of 100 ° C. at -40 Is 4.8 cSt (Example 3 and Comparative Example 5) and viscosity index is 42 and kinematic viscosity at 100 ° C. is 4.4 cSt (Example 6) C ₈ -trimethylolpropane ester: trimethylolpropane Tricaprylate _C18 -trimethylolpropane ester: ester of trimethylolpropane and mixed acid (65% by weight of mixed acid stearic acid / 35% by weight of oleic acid) _C18- pentaerythritol ester: of pentaerythritol and mixed acid Ester (mixed acid is stearic acid 86 weight / Oleic acid 14 wt%) MoDTC: sulfurized oxymolybdenum -N, N-di -n-
Octyldithiocarbamate ZnDTP: Di-2-ethylhexyl zinc dithiophosphate Boron-containing succinimide: Boron / nitrogen atom ratio of 0.5 Overbased calcium sulfonate:
Antioxidant with a total base number of 305 mgKOH / g: 4,4'-methylenebis (2,6-di-t
-Butylphenol) Defoaming agent: Dimethylpolysiloxane Viscosity index improver: Polymethacrylate

[0013]

[Table 1]

The lubricating oil compositions of the present invention of Examples 1-3 are
Both of them have a low friction coefficient, but the lubricating oil compositions of Comparative Examples 1 to 3 using trimethylolpropane ester or pentaerythritol ester instead of the component (B) of the composition of the present invention have additives of Examples 1 to 1. Even if it is exactly the same as 3, the coefficient of friction is high. Examples 4 to 5 and Comparative Examples 4 to 5 The base oils and additives shown in Table 2 were blended to prepare a lubricating oil composition having a kinematic viscosity at 100 ° C. of 8.8 cSt. A friction test was conducted on these lubricating oil compositions to obtain the friction coefficient values shown in Table 2.

[0015]

[Table 2]

The weight ratio of the components (A) and (B) is 90:
The lubricating oil compositions of Example 4 which is 10 and Example 5 which is 50:50 have low friction coefficients, but when the weight ratio of the component (A) and the component (B) is 10:90, the component (B) is As C
The lubricating oil composition of Comparative Example 4 using ₁₄ -carbonate also
The lubricating oil composition of Comparative Example 5 using alkylbenzene as the component (B) also has a high friction coefficient. Example 6 and Comparative Examples 6 to 7 The base oils and additives shown in Table 3 were blended to prepare a lubricating oil composition having a kinematic viscosity at 100 ° C. of 8.8 cSt. A friction test was conducted on these lubricating oil compositions to obtain the friction coefficient values shown in Table 3.

[0017]

[Table 3]

The lubricating oil composition of Example 6 of the present invention has a low friction coefficient, but the lubricating oil composition of Comparative Example 6 in which the base oil consists only of poly-α-olefin and does not contain the component (B). The lubricating oil composition of Comparative Example 7 in which the base oil consisted only of C ₁₄ -carbonic acid ester and did not contain the component (A) also had a high friction coefficient. Examples 7 to 8 and Comparative Examples 8 to 11 The base oils and additives shown in Table 4 were blended to prepare lubricating oil compositions having a kinematic viscosity at 100 ° C of 8.8 cSt. A friction test was conducted on these lubricating oil compositions, and the friction coefficient values shown in Table 4 were obtained.

[0019]

[Table 4]

The lubricating oil compositions of the present invention of Examples 7-8 were:
The lubricating oil composition of Comparative Example 8 which has a low friction coefficient but does not contain the sulfurized oxymolybdenum dithiocarbamate which is the component (C) also has the lubricating oil of Comparative Example 9 which does not contain the zinc dialkyldithiophosphate which is the component (D). The composition also has an extremely high coefficient of friction. Further, the lubricating oil composition of Comparative Example 10 in which the amount of sulfurized oxymolybdenum dithiocarbamate was too small and the lubricating oil composition of Comparative Example 11 in which the amount of sulfurized oxymolybdenum dithiocarbamate was too large had a high friction coefficient. Examples 9 to 10 and Comparative Examples 12 to 13 The base oils and additives shown in Table 5 were blended to prepare a lubricating oil composition having a kinematic viscosity at 100 ° C of 8.8 cSt. A friction test was conducted on these lubricating oil compositions, and the friction coefficient values shown in Table 5 were obtained.

[0021]

[Table 5]

The lubricating oil compositions of Examples 9 to 10 according to the present invention have a low friction coefficient, but the lubricating oil compositions of Comparative Example 12 having a too small amount of zinc dialkyldithiophosphate as the component (D) are also included. The lubricating oil composition of Comparative Example 13 in which the amount of sulfurized oxymolybdenum dithiocarbamate is too large also has a high friction coefficient. The lubricating oil compositions of Examples 3 and 6 were subjected to an oxidation stability test (JIS K2514 ISOT).
165 ° C. × 120 Hrs) was performed. As a result, with respect to the increase in the total acid value, Example 3 was 3.5 mgKOH / g, and Example 6 was
Is 4.6 mgKOH / g, and the viscosity increase rate is 10 in Example 3.
% In Example 6 is 25%, and it is understood that the alkylbenzene having a lower viscosity index is superior in oxidation stability.

[0023]

INDUSTRIAL APPLICABILITY The lubricating oil composition of the present invention is excellent in low friction and wear resistance, and is suitable as a lubricating oil for internal combustion engines, automatic transmissions, shock absorbers, power steerings, etc., especially as an internal combustion engine lubricating oil. Can be used for.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI C10M 137: 10) C10M 105: 48 (C10M 169/04 C10N 10:04 105: 48 10:12 107: 02 20:02 135: 18 30:06 137: 10) 40:04 C10N 10:04 40:25 10:12 20:02 30:06 40:04 40:25 (56) References JP-A-5-279686 (JP, A) Kaihei 5-163497 (JP, A) JP 6-336592 (JP, A) JP 7-331269 (JP, A) JP 8-73878 (JP, A) JP 8-253785 ( JP, A) JP-A-5-331483 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C10M 169/04 C10M 105/04-105/06 C10M 105/36 C10M 105 / 48 C10M 107/02-107/18 C10M 135/18 C10M 137/10 C10N 10:04 C10N 10:12 C10N 20:02 C10N 30:06 C10N 40:04 C10N 40:25-40:28

Claims (2)

(57) [Claims] 1. (A) The kinematic viscosity at 100 ° C. is 2 to 2.
Poly-α-olefin having 0 cSt 15 to 99.9 weight
amount%,as well as, (B) Carbonic acid ester represented by the general formula [1] [Chemical 1] (However, in the formula, R¹And R^TwoIs an alkane having 8 to 22 carbon atoms
Kill groups, which may be the same or different
Good. ), 85 to 0.1% by weight of base oil, (C) Oxidized sulfide having a hydrocarbon group with 8 to 18 carbon atoms
Budendithiocarbamate, and (D) Dialkyldithio having 1 to 18 carbon atoms in the alkyl group
Zinc ophosphate, A lubricating oil composition containing
Derived from oxymolybdenum dithiocarbamate sulfide
The amount of molybdenum used is 200 to 1200 ppm (weight
Ratio) and is derived from zinc dialkyldithiophosphate.
The amount of cancer is 400-1500ppm (weight ratio)
A lubricating oil composition comprising: 2. (A) The kinematic viscosity at 100 ° C. is 2 to 2.
Poly-α-olefin having 0 cSt 15 to 99.9 weight
amount%,as well as, (B) The kinematic viscosity at 100 ° C. is 3 to 40 cSt.
For base oil consisting of 85-0.1% by weight of alkylbenzene
Then (C) Oxidized sulfide having a hydrocarbon group with 8 to 18 carbon atoms
Budendithiocarbamate, and (D) Dialkyldithio having 1 to 18 carbon atoms in the alkyl group
Zinc ophosphate, A lubricating oil composition containing
Derived from oxymolybdenum dithiocarbamate sulfide
The amount of molybdenum used is 200 to 1200 ppm (weight
Ratio) and is derived from zinc dialkyldithiophosphate.
The amount of cancer is 400-1500ppm (weight ratio)
A lubricating oil composition comprising: