JPH0517794A - Lubricant composition - Google Patents

Abstract

PURPOSE:To obtain a lubricant composition excellent in abrasion resistance and hydrolysis resistance by blending a base oil mainly composed of an ester- based compound with a specified phosphorus-based compound and an amine compound. CONSTITUTION:A lubricant composition obtained by blending (A) a base oil mainly composed of an ester-based compound such as trimethylolpropane tert-2- ethylhexanoate, pentaerythritol tetra-2-ethylhexanoate or dioctyl adipate with (B) a phosphorus-based compound of formula I, II or III [R<1> and R<2> are 3-30C (cyclo)alkyl or 6-30C aryl; R<3>-R<5>, R<9>, R<10>, R<12> and R<13> are H or 3-30C (cyclo) or 6-30C aryl; R<6>-R<8> and R'' are 2-4C alkylene;), (q) and (r) are 0-2; X is 1-20], e.g. dilaurylhydrogen phosphite and (C) an amine compound of formula IV (R<14>-R<16> are same as the above-mentioned R<3>) e.g. cyclohexyldodecylamine.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating oil composition, and more specifically, to a base oil containing an ester compound as a main component, a specific phosphorus compound and an amine compound are blended to obtain abrasion resistance and hydrolysis resistance. The present invention relates to a lubricating oil composition having excellent properties.

[0002]

2. Description of the Related Art Conventionally, the problems to be solved by the invention
As the lubricating oil, a mineral lubricating oil made of mineral oil, a chemically synthesized synthetic lubricating oil, a fatty lubricating oil made of animal and vegetable fats and oils, and a mixed lubricating oil made by mixing mineral oil and animal and vegetable fats and oils and synthetic oils are used. Various things such as mixed mixed lubricating oil are used. Among these, the use of synthetic lubricating oils that can be chemically modified in various ways is increasing, and in particular,
A wide variety of ester-based lubricating oils are available. However,
Ester-based lubricating oils have poor wear resistance when used alone as an ester, and have a drawback that the sliding members are significantly worn even when used in a compressor for a refrigerator. As an antiwear agent to prevent it, tricresyl phosphate (TCP) is usually used.
Although triphenyl phosphite (TPP) and the like are used, their anti-wear effect is not as high as expected. Further, the ester is susceptible to hydrolysis in the presence of water, and has a drawback that a fatty acid or a fatty acid metal salt is formed to cause corrosion in the system and clogging of capillaries.

[0003]

Therefore, the present inventors have
In view of the above situation, the base oil containing an ester compound as a main component has been earnestly studied in order to obtain a lubricating oil having more excellent performance. As a result, they have found that the above object can be achieved by blending a specific phosphorus compound and an amine compound. The present invention has been completed based on such findings.

That is, the present invention provides (A) a base oil containing an ester compound as a main component, (B) general formulas (I) and (II).
Or (III)

[0005]

[Chemical 5]

[0006]

[Chemical 6]

[0007]

[Chemical 7]

[Wherein R¹And R²Each has 3 carbons
To 30 alkyl groups, C6 to C30 aryl groups, or
Represents a cycloalkyl group having 3 to 30 carbon atoms, R³, R^Four
And R ^FiveAre hydrogen and alkyl having 3 to 30 carbon atoms, respectively.
Group, an aryl group having 6 to 30 carbon atoms or an aryl group having 3 to 30 carbon atoms
R represents a cycloalkyl group⁶, R⁷And R⁸Is that
Represents an alkylene group having 2 to 4 carbon atoms, p, q and r are
R is 0 to 20 respectively⁹, R^Ten, R¹²And R¹³Is
Hydrogen, an alkyl group having 3 to 30 carbon atoms, and 6 carbon atoms, respectively
To 30 aryl groups or C3 to C30 cycloalkyls
R group¹¹Represents an alkylene group having 2 to 4 carbon atoms
However, x shows 1-20. ] Of the phosphorus compound represented by
At least one and (C) general formula (IV)

[0009]

[Chemical 8]

[In the formula, R ¹⁴ , R ¹⁵ and R ¹⁶ represent hydrogen, an alkyl group having 3 to 30 carbon atoms, an aryl group having 6 to 30 carbon atoms or a cycloalkyl group having 3 to 30 carbon atoms. However,
At least one of R ¹⁴ , R ¹⁵ and R ¹⁶ is a group other than hydrogen, and the total number of carbon atoms in one molecule is 6 or more. ] The present invention provides a lubricating oil composition comprising an amine compound represented by

First, in the present invention, the ester compound as the main component of the base oil (A) is a monovalent or polyvalent fatty acid ester. The kinematic viscosity is not particularly limited, but is usually 1 to 500 cSt (40 ° C), preferably 10 to 100 cSt (40 ° C). Kinematic viscosity is 1 cSt
If the temperature is lower than (40 ° C.), the lubricity becomes insufficient and abnormal wear or seizure occurs, which is not preferable. Also, 500cSt (40 ℃)
If it exceeds, the oil return at a low temperature becomes worse, and the oil supply becomes insufficient, causing seizure, which is not preferable. Specific examples having these characteristics include trimethylolpropane tri-2-ethylhexanoate, pentaerythritol tetra-2-ethylhexanoate, dioctyl adipate and the like.

Next, the phosphorus compound (B) blended with the base oil (A) containing an ester compound as a main component is represented by the above-mentioned general formula (I), (II) or (III). I can give you things. These phosphorus compounds are mixed alone or in combination of two or more. The blending ratio of the phosphorus compound as the component (B) is not particularly limited and may be appropriately selected depending on the situation, but is usually 0 with respect to the base oil (A) containing the ester compound as a main component. 0.001 to 10% by weight
And preferably 0.01 to 2% by weight. Compounding amount is 0.
If it is less than 001% by weight, the effect of preventing wear is not sufficient, which is not preferable. On the other hand, if it exceeds 10% by weight, the wear preventing effect reaches the saturation point and the effect corresponding to the blending amount cannot be obtained, which is not preferable.

In the above general formulas (I), (II) and (III), each symbol is as described above. That is, R ¹
And R ² are each an alkyl group having 3 to 30 carbon atoms, preferably an alkyl group having 6 to 20 carbon atoms (eg, hexyl group, octyl group, decyl group, lauryl group, stearyl group, oleyl group), 6 carbon atoms 30 aryl group, preferably 6 to 20 carbon aryl group (eg phenyl group, tolyl group, xylyl group, nonylphenyl group, dodecylphenyl group, etc.) or 3 to 30 carbon atom cycloalkyl group, preferably carbon number 5 to 15 cycloalkyl groups (for example, cyclopentyl group, cyclohexyl group, trimethylcyclohexyl group, etc.), R ³ , R ⁴ , R ⁵ ,
R ⁹ , R ¹⁰ , R ¹² and R ¹³ are each hydrogen and 3 to 3 carbon atoms.
30 alkyl groups, preferably alkyl groups having 6 to 20 carbon atoms (for example, hexyl group, octyl group, decyl group, lauryl group, stearyl group, oleyl group), 6 to 3 carbon atoms
0 aryl group, preferably an aryl group having 6 to 20 carbon atoms (eg, phenyl group, tolyl group, xylyl group, nonylphenyl group, etc.) or a cycloalkyl group having 3 to 30 carbon atoms, preferably 5 to 15 carbon atoms A cycloalkyl group (eg, cyclopentyl group, cyclohexyl group, trimethylcyclopentyl group, etc.) is shown. In addition, R ⁶ , R ⁷ , and R ⁸
And R ¹¹ each represent an alkylene group having 2 to 4 carbon atoms (for example, ethylene, propylene group, butylene group). Note that p, q, and r are each 0 to 20 (not limited to an integer, including a real number), preferably 2 to 10, and x is 1 to 2.
0 (not limited to integers, including real numbers), preferably 1 to 10
Indicates. Specific examples of the phosphorus compound represented by the general formula (I) include dilauryl hydrogen phosphite,
There are dioleyl hydrogen phosphite, diphenyl hydrogen phosphite, and the like. Specific examples of the phosphorus-based compound represented by the general formula (II) include tris-polyoxyethylene decyl ether phosphate and dipolyoxyethylene nonyl phenyl ether phosphate. And the like. Specific examples of the phosphorus compound represented by the general formula (III) include tetraphenyldipropylene glycol diphosphite and tetratridecyl diethylene glycol diphosphite.

A group containing an ester compound as a main component
The amine compound (C) blended in the oil (A) is the above-mentioned general compound.
It is represented by formula (IV). Where R¹⁴, R¹⁵Over
And R ¹⁶Are hydrogen, an alkyl group having 3 to 30 carbon atoms,
Aryl group having 6 to 30 carbon atoms or siku having 3 to 30 carbon atoms
Alkyl group, preferably alkyl having 6 to 24 carbon atoms
A group, an aryl group, and a cycloalkyl group. However, R
¹⁴, R¹⁵And R¹⁶At least one of the groups is a group other than hydrogen.
And the total number of carbon atoms in one molecule must be 6 or more.
It is important. Here, the alkyl group has a straight chain, a branched chain, or a saturated chain.
It may be either saturated or unsaturated. However, dissolution in base oil
A branched or unsaturated alkyl group is preferred for stability. This
There is no particular limitation on the amount of the amine compound (C) compounded.
No, but usually a base oil mainly composed of ester compounds
It is preferably 0.001 to 10% by weight with respect to (A).
Is 0.01 to 2% by weight. Compounding amount is 0.001 weight
If it is less than%, the hydrolysis preventing effect is insufficient, which is preferable.
Absent. Further, if it exceeds 10% by weight, the effect of preventing hydrolysis is obtained.
The saturation point is reached, and the effect is
Absent. Moreover, it has a negative effect on wear prevention and thermal stability.
Is not preferable. Specific examples of such an amine compound (C)
For example, tri (2-ethylhexyl) amine, di
(2-Ethylhexyl) amine, tert-dodecylami
Amine, tert-octadecylamine, tert-behenylamine
, Oleylamine, dioleylamine, isostearia
Luamine, dimethyl oleylamine, dodecyl anili
Amine, dibenzylamine, cyclohexylamine, 2-me
Cylcyclohexylamine, cyclohexyldodecylure
Min, etc. can be mentioned.

Of course, the lubricating oil composition of the present invention can also be used as a refrigerating machine oil using various refrigerants (CFC refrigerant, alternative CFC refrigerant, etc.) and hydraulic oil for hydraulic devices. Then, if necessary, an antioxidant, an oiliness agent, a copper deactivator, a defoaming agent and the like can be optionally mixed.

[0016]

The present invention will be described in more detail with reference to Examples and Comparative Examples. Examples 1 to 6 and Comparative Examples 1 to 8 The base oils shown in Table 1 were used, and the components were blended at the blending ratios shown in Table 2 to obtain lubricating oil compositions, and the compositions were used as sample oils. As a result, the following test was performed. The wear test evaluated the wear amount of the pin by the Falex tester under the following conditions. Further, the hydrolysis test was conducted under the following conditions according to ASTM D-
According to the hydrolysis test method of 2619-88, the total acid value of the oil layer after the test was measured. Further, a shield tube test was conducted under the following conditions. Abrasion test conditions Blowing of Freon 134a 10 liters / hour load 300 LBS, time 60 minutes Test piece material pin SAE3135 (AST
MD 2670-81 standard material) Block AISI 1137 (ASTM D 267
0-81 standard material) Load under air atmosphere 300LBS, time 60 minutes Test piece material pin SAE3135 (AST
MD 2670-81 standard material) Block AISI 1137 (ASTM D 267
0-81 standard material) Hydrolysis test condition temperature 93 ℃, time 240 hours Catalyst copper piece (13 x 51 x 1 mm) Oil 75g, water 25g Shield tube test condition temperature 175 ℃, time 720 hours, refrigerant Freon 134a

[0017]

[Table 1]

[0018]

[Table 2]

Furthermore, the result of each test item carried out is shown in the third
Shown in the table.

[0020]

[Table 3]

As can be seen from the test results in Table 3, according to the present invention, the shield tube test is satisfactory without any problems.
Moreover, it is understood that the amount of wear is small and the total acid value after hydrolysis is not increased, which is excellent. On the other hand, in the comparative example,
Although the cold tube test was satisfactory without any problems, it was found that both of them lacked the wear resistance and the hydrolysis resistance.

【The invention's effect】

As described above, according to the present invention, the shield tube test is satisfactory without any problem, and the abrasion resistance and the hydrolysis resistance under the fluorocarbon atmosphere are also very excellent, and the refrigerator lubrication is excellent. The effect exhibited when used as oil can be expected sufficiently, and the effect of use can be extremely large. Further, the lubricating oil composition of the present invention has excellent wear resistance even in an air atmosphere and extremely excellent hydrolysis resistance, and its action and effect are extremely large even when used as other lubricating oil such as hydraulic oil.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location C10M 137: 02) C10N 30:06 40:30

Claims (2)

[Claims] 1. A main component of (A) an ester compound
Base oil, (B) General formula (I), (II) or (III) [Chemical 1] [Chemical 2] [Chemical 3] [In the formula, R¹And R²Is an alkane having 3 to 30 carbon atoms
Kill group, aryl group having 6 to 30 carbon atoms or 3 to 3 carbon atoms
Represents a cycloalkyl group of 0, R³, R^FourAnd R ^FiveHaso
Hydrogen, an alkyl group having 3 to 30 carbon atoms, and 6 to 6 carbon atoms, respectively
30 aryl groups or cycloalkyl having 3 to 30 carbon atoms
Group, R⁶, R⁷And R⁸Has 2 to 4 carbon atoms
Is an alkylene group, and p, q and r are each 0 to 2
0, R⁹, R^Ten, R¹²And R¹³Are hydrogen,
C3-C30 alkyl group, C6-C30 aryl
Group or a cycloalkyl group having 3 to 30 carbon atoms, R
¹¹Represents an alkylene group having 2 to 4 carbon atoms, and x is 1 to 20.
Indicates. ] At least one phosphorus compound represented by
(C) General formula (IV) [Chemical 4] [In the formula, R¹⁴, R¹⁵And R¹⁶Is hydrogen, having 3 to 30 carbon atoms
Alkyl group, aryl group having 6 to 30 carbon atoms or 3 carbon atoms
~ 30 cycloalkyl groups are shown. However, R¹⁴, R¹⁵Over
And R¹⁶At least one of the groups is a group other than hydrogen, and 1
The total number of carbon atoms in the molecule is 6 or more. ] Ami
A lubricating oil composition. 2. A refrigerating machine oil comprising the lubricating oil composition according to claim 1.