WO2018083533A1

WO2018083533A1 - Lubricant composition

Info

Publication number: WO2018083533A1
Application number: PCT/IB2017/001330
Authority: WO
Inventors: 貴史森; 剛久佐藤; 崇裕福水; 小川　仁志; 純一西ノ園
Original assignee: エクソンモービルリサーチアンドエンジニアリングカンパニー
Priority date: 2016-11-04
Filing date: 2017-11-06
Publication date: 2018-05-11
Also published as: JP6864461B2; EP3536767A1; SG11201903805VA; JP2018070845A; US20190284499A1

Abstract

A first purpose of the present invention is to provide a lubricant composition that achieves extended anti-shudder durability without causing a decrease in the metal-to-metal friction coefficient, even when the viscosity of the composition is reduced. A lubricant composition characterized by comprising (A) a lubricant base oil, (C) (C-1) a succinimide compound or boronated succinimide compound having a weight-average molecular weight of 4,000 to 7,000, (C-2) a succinimide compound or boronated succinimide compound having a weight-average molecular weight of more than 7,000 to 10,000, and (D) (D-1) an amide-based friction modifier.

Description

Specification

Title of invention: Lubricating oil composition

Technical field

[0001] The present invention relates to a lubricating oil composition, and more particularly to a lubricating oil composition suitably used for an automobile transmission. More specifically, the present invention relates to a lubricating oil composition for a continuously variable transmission.

Background art

[0002] Lubricating oil compositions are widely used in the automotive field such as for internal combustion engines, automatic transmissions, and gear oils. In recent years, there has been a demand for lowering the viscosity of lubricating oil compositions in order to achieve fuel economy. In addition, continuously variable transmissions (CTV) have been widely used instead of stepped automatic transmissions, and metal belt type CVT, which uses a metal belt and a pulley for power transmission, is common.

[0003] One method for improving the fuel efficiency of continuously variable transmission vehicles is to increase the operating conditions of the lock-up clutch, and it is required to extend the anti-shudder life of the lock-up clutch. However, if the amount of friction modifier is increased to extend the anti-shudder life, the friction coefficient between the metal belt and the pulley decreases, causing the problem that the bell grip performance decreases and the torque transmission capacity decreases. . Thus, the anti-shudder performance and the friction coefficient between metals are in a trade-off relationship, and there is a demand for achieving both a sufficient level of torque characteristics and anti-shudder performance at a high level. When the viscosity of the lubricating oil composition for a transmission is lowered, there is also a problem that a sufficient intermetallic friction coefficient cannot be obtained and a sufficiently large torque cannot be secured.

[0004] Conventional lubricating oil compositions for continuously variable transmissions are described in Patent Documents 1 to 5, for example. Patent Document 1 describes a lubricating oil composition in which a specific succinic acid imide compound not containing boron and a phosphorus compound are blended, and does not contain a zinc dialkyldithiophosphate. The friction coefficient between pulleys can be remarkably improved, and a high friction coefficient can be maintained over a long period. It states that it will not cause clogging. Patent Document 2 describes a lubricant composition containing a specific amount and a specific amount ratio of a sulfone monobasic detergent, a salicylate detergent and a boron-containing succinic acid imide additive, and has sufficient torque transmission capacity and speed change. It describes that it retains its characteristics and has excellent anti-shudder performance. Patent Document 3 describes a lubricating oil composition containing a specific amount of a boronated alkyl succinic acid imide having a specific weight average molecular weight and Z or a boronated alkenyl succinic acid imide, and a metal-based detergent having a linear alkyl group. It has a high coefficient of friction between metals, and is described as having excellent speed change characteristics and anti-shudder performance. Patent Document 4 describes a lubricating oil composition containing a specific amount of a specific sulfolane derivative, one or more selected from calcium sulfone and a total of calcium phenol, and a specific viscosity index improver. It describes that it has a metal friction coefficient and achieves both fuel saving and component durability through low viscosity. Patent Document 5 describes a high intermetallic friction coefficient by blending at least four types of additives as essential ingredients: calcium salicylate, phosphorus antiwear agent, friction modifier, and dispersion type viscosity index improver. And the ability to prevent shudder.

Prior art documents

Patent Literature

Patent Document 1: Japanese Patent Laid-Open No. 2006-056934

Patent Document 2: JP 2007-1 2654 1

Patent Document 3: Japanese Patent Publication No. 21 5395

Patent Document 4: Japanese Patent Laid-Open No. 201 0-1 80278

Patent Document 5: Japanese Unexamined Patent Publication No. 2000-355695

Summary of the Invention

Problems to be solved by the invention

[0006] In view of the above circumstances, the first object of the present invention is to provide a lubricating oil composition having an extended shudder prevention life without lowering the coefficient of friction between metals even when the viscosity is lowered. And Means for solving the problem

[0007] As a result of diligent investigations, the present inventors have found that by combining two types of succinimide compounds having a specific mass average molecular weight as an ashless dispersant, and further using a specific friction modifier in combination, It has been found that even when the viscosity is increased, the anti-shudder life can be extended without lowering the coefficient of friction between metals, and the present invention has been achieved.

That is, the present invention provides:

(A) Lubricating base oil,

(C) (C 1) Succinic acid imide compound or boronated succinimide compound having a weight average molecular weight of 4,000 to 7,000,

(C-2) Succinic acid imide compound or boronated succinic acid imide compound having a mass average molecular weight of more than 7,000 to 10,000

(D) (D-1) Amid friction modifier

It is a lubricating oil composition characterized by comprising.

[0009] Further, in order to improve fuel efficiency, the viscosity at a high temperature (for example, 100 ° C) is maintained as much as possible, and the viscosity at a low temperature (for example, 40 ° C) that affects the fuel efficiency is reduced. Although a high viscosity index is required, the conventional continuously variable transmission lubricating oil composition breaks the polymer chain of the base oil and viscosity index improver due to mechanical shearing, leading to a decrease in high-temperature viscosity with running. There's a problem.

[0010] The present inventors further specified the constitution of the lubricating base oil (A) and the viscosity index improver in the above lubricating oil composition, thereby preventing the anti-shudder life without lowering the coefficient of friction between metals. It was found that in addition to the effect of extending the shear strength, the shear stability can be improved.

That is, the lubricating oil composition of the present invention is preferably a poly α-age refin or α— having a kinematic viscosity of 6 to 80 mn ^ Zs at 100 ° C. as part or all of the component (A). The olefin copolymer is contained in an amount of 5 to 30% by mass based on the total mass of the lubricating oil composition,

(Ii) Polymethacrylate having a weight average molecular weight of 15,000-40,000 -Containing grit.

Furthermore, a preferred embodiment of the lubricating oil composition of the present invention has at least one feature of the following (1) to (1 1).

(1) (D-2) It further contains a friction modifier comprising a reaction product of boric acid or boron oxide and epoxide.

(2) A part or all of the component (C_1) and the component (C-2) is a boronated succinimide.

(3) The (C-1) component and / or the (C1-2) component are each boron in an amount of 0.1 to 3 masses relative to the mass of the (C-1) component or the (C1-2) component. % Content.

(4) The mass ratio of the (C 1 1) component to the (C 1 2) component is (C-2) / (C-1) = 1-10.

(5) The lubricating oil composition has a kinematic viscosity at 100 ° C of 3 to 10 mm ² Zs

(6) The lubricating oil composition has a viscosity index of 150 or more.

(7) (D-1) is selected from at least one amide compound derived from a fatty acid having an alkyl group or alkenyl group having 6 to 30 carbon atoms.

(8) The (D-2) is selected from at least one selected from a reaction product of an epoxide represented by the following general formula and boric acid or boron oxide, or a ring-opened product thereof.

[Chemical 1]

0

R1 one C * / \ I- mm f

瞧瞧

R2 R3 (R1, R2, R3, and R4 each independently represent a hydrogen atom or a hydrocarbon containing 1 to 30 carbon atoms, at least one of which is a hydrocarbon group.)

(9) The lubricating oil composition further comprises (E) a metal detergent.

(10) The lubricating oil composition further comprises (F) an ether sulfolane compound.

(1 1) The lubricating oil composition is for a continuously variable transmission.

[0012] In particular, the lubricating oil composition comprises 1 part or all of the component (A),

Contains poly α-year-old olefin or α-year-old olefin copolymer having a kinematic viscosity of 6 to 80 mm ² / s at 00 ° C in an amount of 5 to 30% by mass relative to the total mass of the lubricating oil composition. And (ii) it preferably contains an ether sulfolane compound. Compared to mineral oil, synthetic base oils have a lower affinity with the oilgogo called “Patsukinya gasket”, and the higher the molecular weight (high viscosity) base oil, the lower the affinity. If the affinity is low, the swelling of the seal rubber is reduced, and conversely, it tends to shrink. As a result, there is a problem that the sealing performance is lowered and oil leakage occurs. By making the lubricating oil composition of the present invention such a structure, the swelling property of the seal rubber can be further ensured.

Further, the lubricating oil composition is characterized by excellent initial shudder characteristics by containing a friction modifier made of a reaction product of (D-2) boric acid or boron oxide and epoxide. Have

The invention's effect

[0013] The lubricating oil composition of the present invention can extend the anti-shudder life without lowering the coefficient of friction between metals. This effect can be achieved even when the kinematic viscosity of the lubricating oil composition at 100 ° C is lowered to about 5.0. Moreover, according to the present invention, in addition to the effect, a lubricating oil composition having improved shear stability can be provided. Furthermore, the swelling property of the seal rubber can be ensured. Furthermore, the initial characteristics can be improved among the shudder characteristics. The lubricating oil composition of the present invention can be particularly suitably used as a lubricating oil composition for continuously variable transmissions. BEST MODE FOR CARRYING OUT THE INVENTION

[0014] Hereinafter, each component will be described.

[0015] (A) Lubricating base oil

As the lubricant base oil in the present invention, a conventionally known lubricant base oil can be used, and there are mineral oil, synthetic oil, or a mixed oil thereof. In particular, as a part or all of the lubricating base oil, a poly α-age refin or α-olefin copolymer having a kinematic viscosity of 6 to 80 mm ² / s at 100 ° C is used as a whole lubricating oil composition. The content is preferably 5 to 30% by mass, more preferably the lower limit is 6% by mass, more preferably 8% by mass, and the upper limit is 25% by mass, more preferably 20% by mass. If the content of the base oil is less than the lower limit value, a sufficient viscosity index, that is, fuel economy and protection performance to machine elements cannot be achieved at the same time. Deterioration of rubber (shrinking of rubber) may occur

[0016] Poly α-year-old refin and α-year-old refin copolymer have a kinematic viscosity at 100 ° C.

6~80mm ² Zs may have a, preferably 8 to 80 mm ² Zs, more preferably 8~60mm ² Zs, more good is preferably 9~ 40 mm 2 / s. If the kinematic viscosity at 100 ° C is less than the above lower limit value, the viscosity index, that is, fuel saving performance and protection performance to machine elements cannot be achieved at all. If the kinematic viscosity at 100 ° C exceeds the above upper limit value, It is not preferable because it deteriorates shear stability and rubber compatibility (rubber shrinkage).

[0017] The poly α-year-old refin or α-year-old refin copolymer is a (co) polymer or (co) oligomer of α-year-old refin, and may have any of the above kinematic viscosities. Conventionally known oils can be used. The α-old olefin is, for example, selected from linear or branched olefin hydrocarbons having 2 to 14 carbon atoms, preferably 4 to 12 carbon atoms. Examples include 1-year-old kuten oligomers, 1-decene oligomers, ethylene monopropylene oligomers, isoptene oligomers and their hydrides. Poly α-year-old refin or α-year-old refin copolymer is produced using a meta-octane catalyst. It may be. The (co) polymer or (co) oligomer may have a mass average molecular weight as long as the kinematic viscosity at 10 ° C. satisfies the above range. For example, it has a mass average molecular weight of 1,000 to 10,000, preferably 1,100 to 7,000. The poly α-olefin or α-age olefin copolymer may be used alone or in combination of two or more.

[0018] The lubricating oil composition of the present invention may contain another lubricating base oil in combination with the poly α-age refin or α-age refin copolymer. These lubricating base oils are not particularly limited, and conventionally known mineral base oils and synthetic base oils other than the above poly α-olefin and α-age olefin copolymers can be used.

[0019] As the mineral oil base oil, a lubricating oil fraction obtained by subjecting crude oil to atmospheric distillation and vacuum distillation is subjected to solvent desorption, solvent extraction, hydrocracking, solvent dewaxing, catalytic dewaxing, hydrogenation. Lubricating oils obtained by isomerizing and dewaxing wax base oils such as paraffinic and naphthenic oils, and waxes obtained by solvent dewaxing, which are refined by appropriate combination of refining, washing with sulfuric acid, purification of clay, etc. Base oils. The kinematic viscosity of the mineral oil base oil is not particularly limited, but is preferably 1 to 5 mm ² Zs in order to obtain a lubricating oil composition having a low viscosity.

[0020] Synthetic base oils include isoparaffin, alkylbenzene, alkylnaphthalene, monoester, diester, polyol ester, polyoxyalkylene glycol, dialkyldiphenyl ether, polyphenyl ether, and GT L base oil. Can be used. The kinematic viscosity of the synthetic base oil is not particularly limited. It is also possible to use a poly α-age refin or α-age refin copolymer having a kinematic viscosity at 100 ° C. of less than 6 mm ² Zs or more than 80 mm ² Z s. In order to obtain a lubricating oil composition having a low viscosity, the kinematic viscosity of the synthetic base oil is preferably 1 to 6 mm ² Zs.

[0021] The base oils that can be used in combination may be used singly or in combination of two or more. When using two or more types, use two or more mineral base oils, use two or more synthetic base oils, and use one or more mineral base oils and one or more synthetic base oils. Can be used. Among them, the use of mineral base oil alone, the use of two or more mineral base oils Use, 1 00 C kinematic viscosity of single use of synthetic base oils is less than 1~6mm ² Zs, 1 00 ° ² or more synthetic base oils kinematic viscosity of C is less than 1 to 6 mm ² Zs The use of is preferred.

[0022] Further, in order to obtain a lubricating oil composition having a low viscosity, the entire lubricating base oil has a kinematic viscosity at 100 ° C of 2 to 7 mm ² Zs, preferably 2.3 to 6 mm ^2. It is preferred to have no s, in particular ^{2.5 to} 5.6 mm ² / s.

[0023] (B) Viscosity index improver

The lubricating oil composition of the present invention can contain a conventionally known viscosity index improver. Preferably, polymethacrylate having a weight average molecular weight of 15,000 to 40,000 is preferably included as a viscosity index improver. The lower limit of the mass average molecular weight is preferably 17,000, more preferably 18,000. The upper limit of the mass average molecular weight is preferably 38,000, more preferably 36,000. When the mass average molecular weight is less than the lower limit, the effect of improving the viscosity index is insufficient. When the mass average molecular weight exceeds the upper limit, the effect of improving the viscosity index is obtained, but the shear stability is improved. Is not preferable because of worsening. Although the content of the polymethacrylic monomer is not limited, it is preferably 0.1 to 20% by mass, more preferably 1 to 15% by mass, and further preferably 2 to 10% by mass in the lubricating oil composition.

[0024] The polymethacrylate may be used alone or in combination of two or more.

[0025] The lubricating oil composition of the present invention may contain other viscosity index improvers in addition to the polymethacrylate relay. Other viscosity index improvers include polymethacrylates having a weight average molecular weight of less than 15,000, polymethacrylates having a weight average molecular weight of more than 40,000, polyisobutylene and its hydrogenated products, styrene And styrene monomaleic anhydride copolymer and polyalkylstyrene. When other viscosity index improvers are included, the blending amount thereof is preferably 0.1 to 15% by mass in the lubricating oil composition.

[0026] (C) Succinic acid imide compound The lubricating oil composition of the present invention is characterized by containing two kinds of specific succinic acid compounds as an ashless dispersant. That is, the present invention provides a succinimide compound wherein the lubricating oil composition has (C-1) a weight average molecular weight of 4,000-7,000, preferably 5,000 to 7,000, and (C-2) It is characterized by being combined with a succinic acid imide compound having a mass average molecular weight of more than 7,000 to 10,000, preferably 7,100-9,600. In the following, the component (C-1) is sometimes referred to as a first succinic acid imide compound, and the component (C1-2) is sometimes referred to as a second succinimide compound.

Although not limited, a part or all of the component (C-1) and the component (C-2) may be fluorinated succinimide.

Component (C) is preferably contained in an amount of 0.5 to 3.0% by mass, more preferably 0.6 to 2.5% by mass, and still more preferably 0.9 to 2.0% by mass, based on the entire composition. In the composition. If it is less than the lower limit, it may not be possible to secure anti-shudder. Above the upper limit, the viscosity at low temperatures may be high.

[0027] The mass ratio of the component (C-1) to the component (C-2) is not limited, but (C-2) / (C-1) = 1 -1 0 is preferable, and 1.5 -8 are more preferable, and 2-6 are more preferable. In the ratio in the above range, it is possible to achieve a better balance between the friction coefficient and the shudder characteristic. When the amount of (C-1) is insufficient, the shudder prevention property is insufficient at a low temperature, for example, 40 ° C, and this insufficiency is manifested early in the durability test. If there is a problem and the amount of (C-2) is insufficient, the anti-shuddering property at high temperatures, eg, 120 ° C, is insufficient. There is a problem of manifestation.

[0028] The first and second succinimide compounds in the present invention may be succinimide compounds known as ashless dispersants.

[0029] More specifically, the succinimide compound is a compound obtained by adding succinic anhydride to a polyamine. There are mono-type succinic acid imide compounds and bis-type succinic acid imide compounds, both of which can be used. Monotai The succinic acid imide compound can be represented, for example, by the following formula (1). The bis-type succinic acid imide compound can be represented, for example, by the following formula (2).

[Chemical 2]

[Chemical 3]

In the above formula, R ¹ is independently an alkyl or alkenyl group having 40 to 40 carbon atoms, m is an integer of 1 to 20 and n is an integer of 0 to 20; A bis-type succinic acid imide compound is particularly preferable. The boronated succinic acid imide compound may be a combination of monotype and bistype, a combination of two or more monotypes, or a combination of two or more bistypes. Nitrogen content of succinic acid imide compound include, but are not limited to, 0. 3 to preferably 1 0 mass ^_0/0 relative to the weight of compounds, further 0. Preferably 5 to 5 wt%, in particular Is preferably 0.8 to 2.5% by mass.

More specifically, the boronated succinic acid imide compound is a compound obtained by reacting a succinic acid imide compound represented by the above formula and a boron compound. Boron compounds include boric acid, boric anhydride, boric acid ester, boron oxide, and boron halide. A boronated succinimide compound has at least one alkyl group or alkenyl group in the molecule. And a succinimide compound modified with boric acid or borate (borated). Examples of the alkyl group or alkenyl group include monovalent groups derived from oligomers of olefins such as propylene, 1-pentene, isoptylene, and co-oligomers of ethylene and propylene.

[0031] (C-1) The first succinic acid imide compound has a mass average molecular weight of 4,000 to

Has 7,000. The mass average molecular weight is preferably 5,000 to 7,000, more preferably 5,200 to 6,800. When the molecular weight of the first succinic acid imide compound is less than the above lower limit, the shudder characteristic deteriorates.

In the present invention, the mass average molecular weight of the first boronated succinimide compound is as follows: solvent: THF (tetrahydrofuran), packed column: styrene′divinylbenzene copolymer, set temperature: 40 ° C., set Flow rate 1. Om l Z minutes, measured by I (differential refraction) detector, in terms of polystyrene.

[0032] The boron content in the case of using a boronated succinimide compound as the first succinimide compound is not limited, but is preferably 0.1 to 3% by mass with respect to the mass of the compound. Further, it is preferably 0.2 to 2.5% by mass, more preferably 0.2 to 2% by mass, and particularly preferably 0.2 to 1.5% by mass.

[0033] The content of the first succinimide compound in the lubricating oil composition is not limited, but is preferably 0.05 to 2.00 mass% with respect to the total mass of the lubricating oil composition. 08 to 1.80 mass% is more preferable, 0.1 to 0 to 1.50 mass% is more preferable. If the content is less than the lower limit, sufficient cleanliness may not be ensured. If the content exceeds the upper limit, sludge may be generated.

In addition, as the first succinic acid imide compound, one selected from at least one selected from a non-borated succinic acid imide compound and a boronated succinic acid imide compound can be used. Therefore, one or more non-borated succinimide compounds, boronated succinimide Either a single compound or two or more compounds, or a combination of one or more non-borated succinic acid imide compounds and one or more boronated succinic acid imide compounds may be used.

(C1-2) The second succinimide compound has a mass average molecular weight of more than 7,000 to 10,000. The mass average molecular weight is preferably 7,100-9,600, more preferably 7,500-9,200. When the molecular weight of the second succinic acid imide compound exceeds the above upper limit, the low temperature viscosity of the composition is undesirably increased.

In the present invention, the mass average molecular weight of the second succinic acid imide compound is as follows: solvent: TH F (tetrahydrofuran), packed column: styrene-divinylbenzene copolymer, set temperature: 40 ° C, set flow rate 1. It is a polystyrene equivalent value measured by RI (differential refraction) detector in Om l Z minutes.

[0035] When a boronated succinimide compound is used as the second succinic acid imide compound, the boron content is not limited, but is preferably 0.1 to 3% by mass relative to the mass of the compound, Further, it is preferably 0.2 to 2.5% by mass, more preferably 0.2 to 2% by mass, and particularly preferably 0.2 to 1.5% by mass. The nitrogen content in the succinic acid imide compound is not limited, but is preferably 0.2 to 5.0% by mass, more preferably 0.3 to 2.5% by mass, and particularly preferably 0.5 to 2.0 mass ^_0/0 are preferred.

[0036] The content of the second succinimide compound in the lubricating oil composition is not limited, but is preferably 0.2 to 3.0 mass% with respect to the total mass of the lubricating oil composition. 0.4 to 2.5% by mass is more preferable, and 0.6 to 2.0% by mass is even more preferable. If it is less than the lower limit, sufficient cleanliness may not be ensured. If the upper limit is exceeded, the low-temperature viscosity of the composition is undesirably increased.

As the second succinic acid imide compound, one selected from at least one selected from a non-borated succinic acid imide compound and a boronated succinic acid imide compound can be used. Therefore, one or more non-borated succinimide compounds, boronated succinimide Either a single compound or two or more compounds, or a combination of one or more non-borated succinic acid imide compounds and one or more boronated succinic acid imide compounds may be used.

[0037] The lubricant composition of the present invention may further contain another ashless dispersant in combination with the component (C1-1) and the component (C-2). Other ashless dispersants typically include succinic acid amide compounds.

[0038] In addition to the components (A) to (C) described above, the lubricating oil composition of the present invention further comprises (D) (D-1) an amide friction modifier, and if necessary (D — 2) Use a friction modifier consisting of the reaction product of boric acid or fluorine oxide and epoxide.

(D) Friction modifier

Friction modifiers must be (D-1) amide friction modifiers, and (D-2) friction modifiers consisting of reaction products of fluoric acid or fluorine oxides and epoxides as required. used.

(D-1) The amide friction modifier is not limited, but a fatty acid amide compound is preferably used, and in particular, a linear fatty acid and an aliphatic monoamine or aliphatic polyamine. Amides can be used, and among these, fatty acid amide compounds having an alkyl group or an alkenyl group having 6 to 30 carbon atoms can be suitably used. More specifically, for example, lauric acid amide, lauric acid diethanol amide, lauric acid monopropanol amide, myristic acid amide, myristic acid diethanol amide, myristic acid monopropanol amide, norylremitic acid amide, palmitic acid Acid diethanolamide, palmitic acid monopropanolamide, stearic acid amide, isostearic acid amide, stearic acid dimethanol amide, isostearic acid dimethanol amide, stearic acid diethanolamide, isostearic acid diethanolamide, stearic acid monopropanolamide, isostearic acid Acid monopropanol amide, isostearic acid tris (hydroxymethyl) methylene amide, maleic acid amide, oleic acid dimethanol Amide, diethanol oleate Amide, oleic acid monopropanolamide, coconut oil fatty acid amide, coconut oil fatty acid diethanolamide, coconut oil fatty acid monopropanolamide, carbon number

1 Synthetic mixed fatty acid amide having 1 to 3 carbon atoms, synthetic mixed fatty acid diethanol amide having 1 to 1 to 3 carbon atoms, synthetic mixed fatty acid monopropanolamide having 1 to 1 to 3 carbon atoms, and mixtures thereof are particularly preferable. Preferably used.

This (D-1) amide friction modifier is an essential component.

[0039] The lubricating oil composition of the present invention does not prevent other friction modifiers from being included as long as it contains (D-1) an amide friction modifier as an essential component. For example, other friction modifiers such as other ester friction modifiers, amine friction modifiers, alcohol friction modifiers, and molypden friction modifiers can be included.

Among these, (D-2) The use of a friction modifier comprising a reaction product of boric acid or boron oxide and epoxide improves the initial shudder characteristics and is therefore preferably used.

[0040] (D-2) A friction modifier comprising a reaction product of boric acid or boron oxide and epoxide. The friction modifier made of the reaction product is known per se and is described, for example, in JP-A-2000-87068. Boric acid includes various forms of boric acid (including metaboric acid, H B0 ₂ , orthoboric acid, H ₃ B0 ₃ , and tetraboric acid, H ₂ B ₄ 0 ₇ ), and the formula (RO) _X B (OH) _y (where x is 1 to 3, and y is 0 to 2, and the sum of X and y is 3, where R is 1 to 6 Alkyl borate), which is an alkyl group containing a carbon atom of The epoxide itself, or its reaction equivalent, such as diols and halohydrins. U.S. Pat. No. 4,584,115 is described in detail and is generally prepared by reacting an epoxide (preferably a hydrocarbyl epoxide) with boric acid or boron trioxide. Epoxides can be represented by the following general formula: [Chemical 4]

O

/ \

I I

R2, R2, 3 and! ^ 4 are each independently a hydrogen atom or a hydrocarbon group containing 1 to 30 carbon atoms, and at least one of them. Is a hydrocarbon group. Any two of R 1, R 2, R 3 and R 4 together with the atoms to which they are attached form a cyclic group (which can be alicyclic or heterocyclic). Also good.

Although not limited, it is preferable that any one of R 1, R 2, R 3 and R 4 is a hydrocarbon group having 6 to 30 carbon atoms and the remainder is a hydrogen atom.

Examples of the hydrocarbon group having 6 to 30 carbon atoms include, but are not limited to, an alkyl group, an alkenyl group, an alkynyl group, an aryl group, and the like, and a saturated or unsaturated fatty acid residue. Can do.

For example, saturated fatty acid residues include: cabronic acid residue, strong prillic acid residue, strong purine acid residue, lauric acid residue, myristic acid residue, palmitic acid residue, stearyl acid residue and isostearic acid residue Is mentioned.

In addition, as unsaturated fatty acid residues, linoleic acid residues, α-linolenic acid residues, arinolic acid residues, arachidonic acid residues, docosapentahydrochloride residues, palmitoleic acid residues, paxenoic acid residues, Examples thereof include a bauric acid residue, an oleic acid residue (olyl group), an elaidic acid residue, an erucic acid residue, and a nervonic acid residue.

These epoxides, C ₁₄ - ₁₆ or C ₁₄ - _{l 8} give a巿販mixture of epoxides which, ELF- ATOCH EM or U nion C ARBID It can be purchased from e and can be prepared from the corresponding refin by known methods. Mix boric acid or boron oxide (hereinafter sometimes simply referred to as boric acid) with epoxide or its equivalent (hereinafter sometimes simply referred to as epoxide) and mix with the appropriate temperature (typically The reaction is prepared by heating at 80 ° C to 250 ° C. The molar ratio of boric acid and epoxide is generally 4: 1 to 1: 4. A ratio of 1: 1 to 1: 3 is preferred, and 1: 2 is a particularly preferred ratio. In carrying out this reaction, an inert liquid can be used as the reaction medium. This liquid may be toluene, xylene, black benzene, dimethylformamide, and the like. The reaction forms water and is typically distilled off during the reaction procedure. Hydroxides can be used to facilitate this reaction. In the reaction product, the epoxy ring may be opened. A method for preparing the reactive organism is also described in Japanese Patent Application Publication No. 57-200496.

The compound thus obtained is effectively used as a friction modifier and provides good shudder properties.

[0042] Examples of (D-2) include, but are not limited to, borate chlorides of fatty acid epoxy esters or ring-opened products thereof, such as borate chlorides of glycidyl power prillate. , Glycidyl caprate borate, glycidyl myristate, glycidyl palmitate, glycidyl palmitate, borate chloride of oleic acid, boric acid chloride of ethylene oxyleate, stearin Examples thereof include boric acid chloride of glycidyl acid, boric acid chloride of glycidyl isostearate, boric acid chloride of glycidyl laurate, and the like.

[0043] The amount of (D-1) added is not limited, but per total mass of the lubricating oil composition

The content is preferably 0.01 to 5% by mass, more preferably 0.02 to 4% by mass, and still more preferably 0.1 to 3% by mass.

(D-2) is not essential, but when added, it is preferably 0.01 to 5% by mass, and 0.02 to 4% by mass, based on the total mass of the lubricating oil composition. More preferably, the content is 0.1 to 3% by mass.

[0044] The lubricating oil composition of the present invention preferably further comprises (E) a metal detergent and Z or (F) an ether sulfolane compound in addition to the components (A) to (D).

[0045] (E) Metal detergent

Examples of the metal detergent include detergents having Al-strength metal or al-strength earth metal. Examples include sulfonates containing alkali metals or alkaline earth metals, salicylates containing alkali metals or alkaline earth metals, and phenates containing alkali metals or alkaline earth metals. It is not limited to this. Examples of the alkali metal or alkaline earth metal include magnesium, sodium, sodium, and calcium, but are not limited thereto.

[0046] The sulphonone containing the ar strength metal or the ar force earth metal is not limited, but calcium sulfate and magnesium sulfate are preferably used.

[0047] The salicylate containing an alkali metal or alkaline earth metal is not limited, but calcium salicylate and magnesium salicylate are preferably used.

[0048] The phenate containing an alkali metal or an alkaline earth metal is not particularly limited, but calcium phenate and magnesium phenate are preferably used.

[0049] The amount of the alkali metal or alkaline earth metal contained in the metal detergent is not limited, but is preferably 0.1 to 20 mass% per mass of the metal detergent, and 0.5 to 15 mass%. % Is more preferable, and 1.0 to 15% by mass is more preferable.

[0050] The metal detergent preferably has, but is not limited to, a total base number of 10 to 500 mg KOHZg, more preferably 50 to 4 O Omg KOHZg, and 150 to 400 mg KOH / g. Further preferred. In particular, when 200 to 4 O Omg KOH / g, even more preferably 300 to 4 O Omg KOH / g If it is the most preferable, if it is 3 10-400 mg KOHZg, the cleaning effect is high and the generation of sludge can be suppressed, so the most preferable

[0051] The metal detergent is contained in the lubricating oil composition in an arbitrary ratio. For example, it is 0 to 5% by mass based on the total mass of the lubricating oil composition, more preferably 0.1 to 2% by mass, and still more preferably 0.2 to 1% by mass.

[0052] As the metal detergent, one kind may be used alone, or two or more kinds may be used in combination. Even if they are used together, there is no limitation on the type. For example, sulfonate compounds, salicylate compounds, and phenate compounds may be used. A combination of soot compounds may be used.

[0053] (F) Ether sulfolane compound

By containing the ether sulfolane compound, the lubricating oil composition of the present invention can further ensure appropriate seal rubber swelling. The ether sulfolane compound is the following compound.

[Chemical 5]

In the above formula, R is an alkyl group having 1 to 20 carbon atoms, preferably an alkyl group having 8 to 16 carbon atoms.

[0054] The blending amount of the ether sulfolane compound is preferably 0 to 5% by mass, more preferably 0.1 to 2% by mass, and more preferably 0.2 to 1% by mass based on the total mass of the lubricating oil composition.

[0055] In the lubricating oil composition of the present invention, other additives other than the above (B) to (F) An agent may further be included. For example, oiliness agents, antiwear agents, extreme pressure agents, rust inhibitors, other friction modifiers, antioxidants, corrosion inhibitors, metal deactivators, pour point depressants, antifoaming agents, colorants , And package additives for automatic transmission fluids. Various package additives for lubricating oils containing at least one of these can also be added.

[0056] In particular, the extreme pressure agent is not limited, but a phosphorous extreme pressure agent can be used, such as acidic phosphate ester, acidic phosphate phosphite ester, phosphate ester or phosphorous acid. It is preferable that at least one selected from esters, and their amine salts, phosphoric acid or phosphorous acid.

In addition, but not limited to, at least one selected from acidic phosphoric acid ester, acidic phosphorous acid phosphite ester, phosphoric acid ester or phosphite ester, and their amine salts, and phosphoric acid Alternatively, at least one selected from phosphorous acid is preferably selected.

Further, at least one selected from, but not limited to, acidic phosphate ester, acidic phosphate phosphite ester, phosphate ester or phosphite ester, and amine salts thereof, and phosphoric acid or Preferably, at least one selected from phosphorous acid is selected.

In addition, a combination of an acidic phosphate ester and one or more compounds selected from phosphoric acid or phosphorous acid is also preferable, and among acidic phosphate esters, acidic phosphoric acid butyl ester, acidic phosphoric acid hexyl ester, acidic acid Use of phosphoric acid cutyl ester and acidic phosphoric acid dodecyl ester is preferred.

The amount of these phosphorus-based extreme pressure agent, but are not limited to, lubricating oil composition total weight equivalents or from 0.01 to 2.5 mass ^_0/0 are preferred, 0.02 to 1.5 mass ^_0/0 Is more preferably 0.02 to 1.0% by mass.

The kinematic viscosity at 100 ° C. of the lubricating oil composition of the present invention is not limited, but is preferably 3 to 10 mm ² Zs, and is 3 to 8 mm ² Z s. more preferably, 4-7. more preferably from 5 mm ² / s, and still more preferably 4-6 m m ² / s. The kinematic viscosity at 100 ° C of the lubricating oil composition is high. If the value is below the lower limit, it may not be possible to secure a sufficient friction coefficient. Further, if it exceeds the above upper limit value, the shudder characteristic may be deteriorated.

[0058] The viscosity index of the lubricating oil composition of the present invention is not limited, but is preferably 150 or more, and more preferably 160 or more. If the viscosity index of the lubricating oil composition is less than the above lower limit, fuel efficiency characteristics at 40 ° C may not be sufficiently secured. The upper limit is not limited, but is preferably 250.

[0059] The lubricating oil composition of the present invention has the effect of having a sufficiently large coefficient of friction between metals and ensuring the shudder characteristics even though the viscosity is reduced. Further, as described above, shear stability can be ensured by further specifying the composition of the base oil and the viscosity index improver according to the present invention. Furthermore, by containing an ether sulfolane compound, it is possible to ensure an appropriate seal rubber swelling property. Furthermore, by using a metal cleansing agent having a total base number of 200 to 400 mg KO H / g, generation of sludge can be suppressed while ensuring cleanliness. The lubricating oil composition of the present invention can be suitably used for a continuously variable transmission.

Example

[0060] Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples.

[0061] Each component used in Examples and Comparative Examples is as follows. Each component shown below was mixed in the composition shown in Table 1 or Table 2 to prepare a lubricating oil composition. In the following, KV 100 means kinematic viscosity at 100 ° C, V I means viscosity index, and PMA means polymethacrylate. The coefficient of friction is the ratio of the coefficient of friction when the composition of Comparative Example 8 (commercially available product) is 1.

(A) Lubricating base oil,

■ Mineral oil 1: Highly hydrorefined ball fin base oil (KV 1 00 = 3.1 mm2 / s, V I = 1 1 2)

-Mineral oil 2: Highly hydrorefined paraffinic base oil (KV 1 00 = 4.2 rnrn s , VI = 1 22)

-Mineral oil 3: Highly hydrorefined paraffinic base oil (KV 1 00 = 4.2 mm ² / s, VI = 1 34)

-Mineral oil 4: Hydrorefined paraffinic base oil (KV 1 00 = 2.2 mm 2 / s, V 1 = 1 09)

-Mineral oil 5: Hydrorefined base fin base oil (KV 1 00 = ^2.5 mm ² Zs, V 1 = 99)

■ Synthetic base oil 1: Poly _α—aged refin (KV 1 00 = 10 mm ² 5, VI =

1 3 7)

■ Synthetic base oil 2: Poly 1 α-year-old olefin (KV 1 00 = 40 mm ² Zs, VI =

1 47)

■ Synthetic base oil 3: Ethylene mono α-age olefin copolymer (KV 1 00 = 10 mm ² / s VI = 1 50)

-Synthetic base oil 4: Ethylene mono α-age olefin copolymer (KV 1 00 = 40 mm ² / s, VI = 1 55)

[0062] (B) Viscosity index improver

■ PMA based viscosity index improver 1 (Mw = 30, 000) , - (CH 2 -C (CH 3) (COOR)) n - has the structure.

[0063] (C) Boronated succinic acid imide compound

(C 1 1)

■ Boronated succinic acid imide compound 1 (Mw = 5,600, B: 0.34 w ΐ%, Ν = 1.58 wt%, in formula (2), R 1 is a polyisobutenyl group, n = 4 to 1 Mixture of 2)

-Boronated succinimide compound 3 (Mw = 4,600, B: 1.8 wt%, N = 2.35 wt%, in the formula (2), R 1 is a polyisobutenyl group, n = 4 to 12 blend)

(C-2)

-Fluorinated succinic acid imide compound 2 (Mw = 8, 500, B: 0.23 wt %, N = 0.88 wt% _{s In the} formula (2), R 1 is a polyisoptenyl group and a mixture of n = 4 to 1 2))

[0064] (D) Friction modifier

(D-1) Component Amid friction modifier

-(D— 1 a) Reaction product of isostearic acid and squirrel (hydroxymethyl) aminomethan

'(D- 1 b) Isostearic acid diethanolamide

-(D— 1 c) Diethanolamide stearate

■ (D— 1 d) Oleic acid diethanolamide

-(D— 1 e) Lauric acid diethanolamide

(D-2) Component Friction modifier comprising boron chloride epoxide or ring-opened product thereof-(D-2 a) Borate of ethylene oxide oleate

■ (D-2b) Boride of stearic acid ethylene oxide

-(D — 2 c) Fluoride glycidyl oleate

-(D-2 d) Boride of glycidyl laurate

(E) Metal detergent

-C a sulfonate (total base number 350 mg KO HZg)

■ C a salicylate (total base number 30 Om g KOHZg)

■ Mg salicylate (total base number 40 Omg KOHZg)

[0065] (F) Ether sulfolane compound

■ LUBR I ZOL 730 (compound with R ¹ = C, ₀ H ₂ in the following formula)

[0066] (F) Other additives

Antiwear agent, friction modifier, antioxidant, antifoam agent, metal deactivator, and colorant

[0067] [Table 1-1] Table 1 1 1

[0068] [Table 1-2]

Table 1 1 2

Composition performance

[0069] 2]

Table 2

Claims

The scope of the claims

[Claim 1] (A) Lubricating base oil,

(C) (C 1) succinimide compound or boronated succinimide compound having a weight average molecular weight of 4,000 to 7,000,

(C—2) succinimide compound or boronated succinimide compound having a weight average molecular weight of more than 7,000 to 10,000

(D) (D— 1) Amid friction modifier

A lubricating oil composition comprising:

[Claim 2] (D) (D—2) A friction modifier comprising a reaction product of boric acid or fluorine oxide and epoxide.

The lubricating oil composition according to claim 1, further comprising:

[Claim 3] As part or all of the component (A), a kinematic viscosity at 100 ° C.

Containing from 5 to 30% by weight of poly α-age olefin or α-olefin copolymer having a thickness of 80 mm ² / s with respect to the total weight of the lubricating oil composition; and

(I) The lubricating oil composition according to claim 1 or 2, further comprising polymethacrylate having a weight average molecular weight of 15,000 to 40,000.

[Claim 4] A part or all of the component (C-1) and the component (C1-2)

The lubricating oil composition according to any one of claims 1 to 3, wherein the lubricating oil composition is a boronated succinic acid imide.

[Claim 5] The component (C-1) and the soot or the component (C-2) are each boron in terms of the mass of the component (C-1) or the component (C-2). The lubricating oil composition according to claim 4, which is contained in an amount of 1 to 3% by mass.

[Claim 6] The mass ratio of the (C-1) component to the (C-2) component is (C1-2) /

6. The lubricating oil composition according to claim 1, wherein (C 1 1) = 1 to 10.

[Claim 7] The lubricating oil composition according to any one of claims 6 to 6, wherein the succinimide compound is represented by the following formula (1) or (2). [Chemical 1]

[Chemical 2]

In the above formula, R ¹ is independently an alkyl group or alkenyl group having 40 to 40 carbon atoms, m is an integer of 1 to 20 and n is an integer of 0 to 20.

The lubricating oil composition according to any one of claims 1 to 7, which has a kinematic viscosity of 3 to 10 mm ² Z s at 100 ° C.

The lubricating oil composition according to claim 1, having a viscosity index of 1550 or higher.

10. The method according to claim 1, wherein (D-1) is selected from at least one amide compound derived from a fatty acid having an alkyl group or alkenyl group having 6 to 30 carbon atoms. The lubricating oil composition according to claim 1.

The (D-2) is at least one selected from a reaction product of an epoxide represented by the following general formula with boric acid or boron oxide, or a ring-opened product thereof. The lubricating oil composition according to any one of 2 to 10. [Chemical 3]

one

C-one R4

瞧薩

R2 R3

(R1, R2, R3, R4 are each independently hydrogen atom or 1

Refers to a hydrocarbon group containing up to 30 carbon atoms, of which at least one is a hydrocarbon group. )

[Claim 12] The method further comprises (E) a metal detergent.

1 The lubricating oil composition according to any one of 1 above.

[Claim 13] The lubricating oil composition according to any one of claims 1 to 12, further comprising (F) an ether sulfolane compound.

[Claim 14] The lubricating oil composition according to any one of claims 1 to 13, wherein the lubricating oil composition is used for a continuously variable transmission.