JP2017031269A - Lubricant base oil for fluid bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ester-based lubricant base oil for fluid bearing excellent in hydrolysis resistance, high in viscosity index and good in low temperature fluidity.SOLUTION: Mixed ester by blending a specific aliphatic monocarboxylic acid ester compound and a 3-methyl-1,5-pentanediol diester compound at a specific ratio is used as a lubricant base oil for fluid bearing.SELECTED DRAWING: None

Description

The present invention relates to a lubricating base oil for fluid bearings.

In motors mounted on HDDs (hard disk drives) and the like, ball bearings and roller bearings were used as bearings. However, in recent years, fluid bearings have been developed in response to demands for motor miniaturization, low vibration and low noise. As hydrodynamic bearings, hydrodynamic bearings and sintered oil-impregnated bearings have been put into practical use.

The hydrodynamic bearing supports the rotating shaft by the oil film pressure of the lubricating oil interposed in the gap between the outer peripheral surface of the shaft and the inner peripheral surface of the sleeve, and has a dynamic pressure groove on at least one of the outer peripheral surface of the shaft and the inner peripheral surface of the sleeve. The sliding surface of the rotating shaft is levitated and supported by a lubricating oil film formed by the dynamic pressure effect. The sintered oil-impregnated bearing is provided with a lubricating oil on a porous body made of sintered metal or the like. Alternatively, a self-lubricating function is provided by impregnation with lubricating grease.

Spindle motors equipped with fluid dynamic bearings have been used with higher performance AV / OA devices and the widespread use of portable devices. In recent years, there has been a strong demand for higher speeds and smaller sizes. There is a request. In order to meet the demand for lowering the torque, a lubricating base oil having a relatively low viscosity has been selected. Low-viscosity lubricant base oils include synthetic hydrocarbon base oils such as poly-α-olefins, ester base oils such as aliphatic dibasic acid diesters, neopentyl polyol esters, and fatty acid monoesters. Lubricating base oils for fluid bearings used have been proposed (Patent Documents 1 to 8).

Among them, ester-based lubricant base oils that are excellent in viscosity characteristics, low-temperature fluidity, and the like are often used as lubricant base oils for fluid bearings.

However, ester-based lubricating base oils contain ester groups in their molecular structure, so that hydrolysis occurs due to moisture, which may be a problem when the spindle motor is used for a long time.

Japanese National Patent Publication No. 11-514778 Japanese National Patent Publication No. 11-51479 JP 2000-500908 A JP 2003-119482 A International Publication WO2004 / 018595 Pamphlet JP 2004-084839 A JP 2005-290256 A JP 2008-007741 A

An object of the present invention is to provide a lubricating base oil for a fluid bearing that has excellent hydrolysis stability, a high viscosity index, and good low-temperature fluidity.

As a result of intensive studies to achieve the above-mentioned problems, the mixed ester compound obtained by mixing a specific fatty acid monoester compound and a diol ester compound at a specific ratio has excellent hydrolysis stability, a high viscosity index, The present invention has been completed by finding that it is a lubricant base oil for fluid bearings having good low temperature fluidity.

That is, the present invention provides a lubricating base oil for fluid bearings having the following items.

[Claim 1]
General formula (1)
[Wherein, R ¹ represents a residue obtained by removing a carboxyl group from a linear aliphatic saturated monocarboxylic acid having 7 to 17 carbon atoms. n and m are the same or different and each represents an integer of 2 to 12. ]
One or more of aliphatic saturated monocarboxylic acid ester compounds represented by:
General formula (2)
[Wherein, R ² and R ³ are the same or different and each represents a residue obtained by removing a carboxyl group from a linear aliphatic saturated monocarboxylic acid having 7 to 11 carbon atoms. ]
1 or 2 or more types of methylpentanediol diester compounds represented by the formula (1), wherein the weight ratio of the aliphatic saturated monocarboxylic acid ester compound to the methylpentanediol diester compound is 30:70 to 80:20. Lubricating base oil for fluid bearings.

[Section 2]
The lubricating base oil for fluid bearings according to [Item 1], wherein the difference between n and m described in the general formula (1) is 2.

[Section 3]
The lubricating base oil for fluid bearings according to [Item 1] or [Item 2], wherein the aliphatic saturated monocarboxylic acid ester compound has a total carbon number of 26 to 40.

[Claim 4]
The lubricating base oil for fluid bearings according to any one of [Item 1] to [Item 3], wherein n in the general formula (1) is an integer of 7 to 11.

[Section 5]
[Item 1] to [Item 4] wherein R ¹ described in the general formula (1) is a residue obtained by removing a carboxyl group from a linear aliphatic saturated monocarboxylic acid having 7 to 13 carbon atoms. The lubricating base oil for fluid bearings according to any one of the above.

[Claim 6]
The fluid according to any one of [Item 1] to [Item 5], wherein the total of the aliphatic saturated monocarboxylic acid ester compound and the methylpentanediol diester compound in the lubricating base oil for fluid bearings is 90% by weight or more. Lubricating base oil for bearings.

[Claim 7]
[Claim 1] to [Claim 6], wherein the fluid bearing lubricant base oil is a hydrodynamic bearing lubricant base oil or a sintered oil-impregnated lubricant base oil. Lubricating base oil.

[Section 8]
A lubricating oil composition for fluid bearings, comprising the lubricating oil base oil for fluid bearings according to any one of [Item 1] to [Item 7] and an antioxidant.

[Claim 9]
The lubricating oil composition for fluid bearings according to [Item 8], wherein the antioxidant is a phenol-based antioxidant and / or an amine-based antioxidant.

The lubricant base oil for fluid bearings of the present invention is a lubricant base oil for fluid bearings having excellent hydrolysis stability, a high viscosity index, and good low-temperature fluidity.

<Lubricating base oil for fluid bearings>
The lubricating base oil for fluid bearings of the present invention comprises an aliphatic monocarboxylic acid ester compound represented by the following general formula (1) and a methylpentanediol diester compound represented by the following general formula (2) in a weight ratio. It is contained in the range of 80:20 to 30:70.

(Aliphatic monocarboxylic acid ester compound)
The aliphatic monocarboxylic acid ester compound used in the present invention has the following general formula (1):
[Wherein, R ¹ represents a residue obtained by removing a carboxyl group from a linear aliphatic saturated monocarboxylic acid having 7 to 17 carbon atoms. n and m are the same or different and each represents an integer of 2 to 12. ]
It is 1 type, or 2 or more types of the aliphatic monocarboxylic acid ester compound represented by these.

The aliphatic monocarboxylic acid ester compound according to the present invention includes a linear aliphatic saturated monocarboxylic acid and the following general formula (3):
[Wherein, n and m are the same or different and each represents an integer of 2 to 12. ]
An aliphatic monocarboxylic acid ester compound obtained by, for example, esterifying the branched aliphatic saturated alcohol represented by the formula:

[Linear aliphatic saturated monocarboxylic acid]
In the present specification and claims, the description of “residue obtained by removing a carboxyl group from a linear aliphatic saturated monocarboxylic acid having 7 to 17 carbon atoms” in the general formula (1) is a residue Means 7 to 17 carbon atoms, and the linear aliphatic saturated monocarboxylic acid corresponds to the linear aliphatic saturated monocarboxylic acid having 8 to 18 carbon atoms.

The straight chain aliphatic monocarboxylic acid having 8 to 18 carbon atoms is preferably a straight chain aliphatic monocarboxylic acid having 8 to 14 carbon atoms, and particularly preferably a straight chain aliphatic monocarboxylic acid having 8 to 12 carbon atoms. . When the carbon number is less than 8, the viscosity of the base oil becomes very low and the evaporation amount becomes large. Moreover, since the viscosity of a base oil will become high when this carbon number exceeds 18, it is unpreferable. Specific examples of the linear aliphatic monocarboxylic acid having 8 to 18 carbon atoms include n-octanoic acid, n-nonanoic acid, n-decanoic acid, n-undecanoic acid, n-dodecanoic acid, n-tridecanoic acid, Examples include n-tetradecanoic acid, n-pentadecanoic acid, n-hexadecanoic acid, n-heptadecanoic acid, and n-octadecanoic acid. Among these, n-octanoic acid, n-nonanoic acid, n-decanoic acid, n-undecanoic acid, n-dodecanoic acid, n-tridecanoic acid, and n-tetradecanoic acid are preferable.

If the structure of the linear aliphatic saturated monocarboxylic acid is a branched chain structure, the viscosity index is lowered, which is not preferable.

[Branched aliphatic saturated alcohol]
In the general formula (3), n and m are the same or different and are an integer of 2 to 12, preferably an integer of 3 to 11. When it is 2 or less, the base oil is easily evaporated, and when it is 12 or more, the viscosity of the base oil is increased.

The difference between n and m is preferably 2, and in particular, the value of (nm) is preferably 2. When the difference between n and m is 2, n is preferably an integer of 5 to 11, more preferably an integer of 6 to 10, and particularly preferably an integer of 7 to 9.

Specific examples of the branched aliphatic saturated alcohol include 2-butyloctanol, 2-pentylnonanol, 2-hexyldecanol, 2-heptylundecanol, 2-octyldodecanol, 2-nonyltridecanol, 2- Examples include decyltetradecanol. Among these, 2-butyloctanol, 2-pentylnonanol, 2-hexyldecanol, 2-heptylundecanol, and 2-octyldodecanol are preferable, and 2-hexyldecanol and 2-octyldodecanol are particularly preferable.

The total number of carbon atoms of the aliphatic monocarboxylic acid ester compound according to the present invention is preferably 20 to 36, and particularly preferably 22 to 32.

Specific examples of the aliphatic monocarboxylic acid ester compound according to the present invention include n-octanoic acid (2-butyloctyl), n-octanoic acid (2-pentylnonyl), n-octanoic acid (2-hexyldecyl), n-octanoic acid (2-heptylundecyl), n-octanoic acid (2-octyldodecyl), n-octanoic acid (2-nonyltridecyl), n-octanoic acid (2-decyltetradecyl), n-nonanoic acid ( 2-butyloctyl), n-nonanoic acid (2-pentylnonyl), n-nonanoic acid (2-hexyldecyl), n-nonanoic acid (2-heptylundecyl), n-nonanoic acid (2-octyldodecyl) , N-nonanoic acid (2-nonyltridecyl), n-nonanoic acid (2-decyltetradecyl), n-decanoic acid (2-butyloctyl), n-decanoic acid (2-pentyl) Nonyl), n-decanoic acid (2-hexyldecyl), n-decanoic acid (2-heptylundecyl), n-decanoic acid (2-octyldodecyl), n-decanoic acid (2-nonyltridecyl), n-decane Acid (2-decyltetradecyl), n-undecanoic acid (2-butyloctyl), n-undecanoic acid (2-pentylnonyl), n-undecanoic acid (2-hexyldecyl), n-undecanoic acid (2-heptyl) Undecyl), n-undecanoic acid (2-octyldodecyl), n-undecanoic acid (2-nonyltridecyl), n-undecanoic acid (2-decyltetradecyl), n-dodecanoic acid (2-butyloctyl), n- Dodecanoic acid (2-pentylnonyl), n-dodecanoic acid (2-hexyldecyl), n-dodecanoic acid (2-heptylundecyl), n-dodecanoic acid 2-octyldodecyl), n-dodecanoic acid (2-nonyltridecyl), n-dodecanoic acid (2-decyltetradecyl), n-tridecanoic acid (2-butyloctyl), n-tridecanoic acid (2-pentylnonyl), n-tridecanoic acid (2-hexyldecyl), n-tridecanoic acid (2-heptylundecyl), n-tridecanoic acid (2-octyldodecyl), n-tridecanoic acid (2-nonyltridecyl), n-tridecanoic acid (2 -Decyltetradecyl), n-tetradecanoic acid (2-butyloctyl), n-tetradecanoic acid (2-pentylnonyl), n-tetradecanoic acid (2-hexyldecyl), n-tetradecanoic acid (2-heptylundecyl) , N-tetradecanoic acid (2-octyldodecyl), n-tetradecanoic acid (2-nonyltridecyl), n-teto Radecanoic acid (2-decyltetradecyl), n-pentadecanoic acid (2-butyloctyl), n-pentadecanoic acid (2-pentylnonyl), n-pentadecanoic acid (2-hexyldecyl), n-pentadecanoic acid (2- Heptylundecyl), n-pentadecanoic acid (2-octyldodecyl), n-pentadecanoic acid (2-nonyltridecyl), n-pentadecanoic acid (2-decyltetradecyl), n-hexadecanoic acid (2-butyloctyl), n -Hexadecanoic acid (2-pentylnonyl), n-hexadecanoic acid (2-hexyldecyl), n-hexadecanoic acid (2-heptylundecyl), n-hexadecanoic acid (2-octyldodecyl), n-hexadecanoic acid (2 -Nonyltridecyl), n-hexadecanoic acid (2-decyltetradecyl), n-heptadecane (2-butyloctyl), n-heptadecanoic acid (2-pentylnonyl), n-heptadecanoic acid (2-hexyldecyl), n-heptadecanoic acid (2-heptylundecyl), n-heptadecanoic acid (2-octyldodecyl) ), N-heptadecanoic acid (2-nonyltridecyl), n-heptadecanoic acid (2-decyltetradecyl), n-octadecanoic acid (2-butyloctyl), n-octadecanoic acid (2-pentylnonyl), n-octadecanoic acid (2-hexyldecyl), n-octadecanoic acid (2-heptylundecyl), n-octadecanoic acid (2-octyldodecyl), n-octadecanoic acid (2-nonyltridecyl), n-octadecanoic acid (2-decyltetradecyl) ). Among them, n-octanoic acid (2-butyloctyl), n-octanoic acid (2-pentylnonyl), n-octanoic acid (2-hexyldecyl), n-octanoic acid (2-heptylundecyl), n- Octanoic acid (2-octyldodecyl), n-octanoic acid (2-nonyltridecyl), n-octanoic acid (2-decyltetradecyl), n-nonanoic acid (2-butyloctyl), n-nonanoic acid (2-pentyl) Nonyl), n-nonanoic acid (2-hexyldecyl), n-nonanoic acid (2-heptylundecyl), n-nonanoic acid (2-octyldodecyl), n-nonanoic acid (2-nonyltridecyl), n-nonane Acid (2-decyltetradecyl), n-decanoic acid (2-butyloctyl), n-decanoic acid (2-pentylnonyl), n-decanoic acid (2-hexyldecyl), n- Canic acid (2-heptylundecyl), n-decanoic acid (2-octyldodecyl), n-decanoic acid (2-nonyltridecyl), n-decanoic acid (2-decyltetradecyl), n-undecanoic acid (2- Butyloctyl), n-undecanoic acid (2-pentylnonyl), n-undecanoic acid (2-hexyldecyl), n-undecanoic acid (2-heptylundecyl), n-undecanoic acid (2-octyldodecyl), n -Undecanoic acid (2-nonyltridecyl), n-undecanoic acid (2-decyltetradecyl), n-dodecanoic acid (2-butyloctyl), n-dodecanoic acid (2-pentylnonyl), n-dodecanoic acid (2- Hexyldecyl), n-dodecanoic acid (2-heptylundecyl), n-dodecanoic acid (2-octyldodecyl), n-dodecanoic acid (2-nonyl) Ridecyl), n-dodecanoic acid (2-decyltetradecyl), n-tridecanoic acid (2-butyloctyl), n-tridecanoic acid (2-pentylnonyl), n-tridecanoic acid (2-hexyldecyl), n- Tridecanoic acid (2-heptylundecyl), n-tridecanoic acid (2-octyldodecyl), n-tridecanoic acid (2-nonyltridecyl), n-tetradecanoic acid (2-butyloctyl), n-tetradecanoic acid (2-pentyl) Nonyl), n-tetradecanoic acid (2-hexyldecyl), n-tetradecanoic acid (2-heptylundecyl), n-tetradecanoic acid (2-octyldodecyl), n-pentadecanoic acid (2-butyloctyl), n- Pentadecanoic acid (2-pentylnonyl), n-pentadecanoic acid (2-hexyldecyl), n-pentadecanoic acid (2 -Heptylundecyl), n-pentadecanoic acid (2-octyldodecyl), n-hexadecanoic acid (2-butyloctyl), n-hexadecanoic acid (2-pentylnonyl), n-hexadecanoic acid (2-hexyldecyl), n-hexadecanoic acid (2-heptylundecyl), n-heptadecanoic acid (2-butyloctyl), n-heptadecanoic acid (2-pentylnonyl), n-heptadecanoic acid (2-hexyldecyl), n-heptadecanoic acid ( 2-heptylundecyl), preferably n-octanoic acid (2-pentylnonyl), n-octanoic acid (2-hexyldecyl), n-octanoic acid (2-heptylundecyl), n-octanoic acid ( 2-octyldodecyl), n-octanoic acid (2-nonyltridecyl), n-nonanoic acid (2-pentylnonyl), n- Nanoic acid (2-hexyldecyl), n-nonanoic acid (2-heptylundecyl), n-nonanoic acid (2-octyldodecyl), n-nonanoic acid (2-nonyltridecyl), n-decanoic acid (2-butyl) Octyl), n-decanoic acid (2-pentylnonyl), n-decanoic acid (2-hexyldecyl), n-decanoic acid (2-heptylundecyl), n-decanoic acid (2-octyldodecyl), n- Undecanoic acid (2-butyloctyl), n-undecanoic acid (2-pentylnonyl), n-undecanoic acid (2-hexyldecyl), n-undecanoic acid (2-heptylundecyl), n-dodecanoic acid (2- Butyloctyl), n-dodecanoic acid (2-pentylnonyl), and n-dodecanoic acid (2-hexyldecyl) are preferred.

[Methylpentanediol diester compound]
The methylpentanediol diester compound used in the present invention has the following general formula (2):
[Wherein, R ² and R ³ are the same or different and represent a residue obtained by removing a carboxyl group from a linear saturated aliphatic monocarboxylic acid having 7 to 11 carbon atoms. ]
It is 1 type (s) or 2 or more types of the methylpentanediol diester compound represented by these.

The methylpentanediol diester compound according to the present invention is a methylpentanediol diester compound obtained by esterification of 3-methyl-1,5-pentanediol and a linear aliphatic saturated monocarboxylic acid. .

[Linear aliphatic saturated monocarboxylic acid]
In the present specification and claims, the description of “residue obtained by removing a carboxyl group from a linear aliphatic saturated monocarboxylic acid having 7 to 11 carbon atoms” in the general formula (2) is a residue Means 7 to 17 carbon atoms, and the linear aliphatic saturated monocarboxylic acid corresponds to a linear aliphatic saturated monocarboxylic acid having 8 to 12 carbon atoms. Specific examples include n-octanoic acid, n-nonanoic acid, n-decanoic acid, n-undecanoic acid, and n-dodecanoic acid. These can be used alone or in combination of two or more.

In the methylpentanediol diester compound represented by the above general formula (2) according to the present invention, specific examples of the case where R ² and R ³ are the same include 3-methyl-1,5-pentanediol di ( n-octanoate), 3-methyl-1,5-pentanediol di (n-nonanoate), 3-methyl-1,5-pentanediol di (n-decanoate), 3-methyl-1,5-pentanediol di (N-undecanoate), 3-methyl-1,5-pentanediol di (n-dodecanoate) is exemplified. Among them, particularly preferred are 3-methyl-1,5-pentanediol di (n-nonanoate), 3-methyl-1,5-pentanediol di (n-decanoate), 3-methyl-1,5- Pentanediol di (n-undecanoate).

Specific examples of the case where R ² and R ³ are different include diesters of 3-methyl-1,5-pentanediol, n-octanoic acid and n-nonanoic acid, and 3-methyl-1,5-pentanediol. And n-octanoic acid and n-decanoic acid diester, 3-methyl-1,5-pentanediol and n-octanoic acid and n-undecanoic acid diester, 3-methyl-1,5-pentanediol and n Diesters with octanoic acid and n-dodecanoic acid, diesters with 3-methyl-1,5-pentanediol and n-nonanoic acid and n-decanoic acid, 3-methyl-1,5-pentanediol and n-nonane Diester of acid and n-undecanoic acid, diester of 3-methyl-1,5-pentanediol with n-nonanoic acid and n-dodecanoic acid, 3-methyl-1,5-pen Diester of diol and n-decanoic acid and n-undecanoic acid, diester of 3-methyl-1,5-pentanediol and n-decanoic acid and n-dodecanoic acid, 3-methyl-1,5-pentanediol and and diesters with n-undecanoic acid and n-dodecanoic acid. Among them, particularly preferred are diesters of 3-methyl-1,5-pentanediol with n-octanoic acid and n-nonanoic acid, 3-methyl-1,5-pentanediol with n-octanoic acid and n- Diester with decanoic acid, diester with 3-methyl-1,5-pentanediol and n-octanoic acid and n-undecanoic acid, 3-methyl-1,5-pentanediol with n-nonanoic acid and n-decanoic acid Diester of 3-methyl-1,5-pentanediol with n-nonanoic acid and n-undecanoic acid, 3-methyl-1,5-pentanediol with n-decanoic acid and n-undecanoic acid Diesters may be mentioned.

A combination of the aliphatic monocarboxylic acid ester compound and the methylpentanediol diester compound can be used as a lubricant base oil for a fluid bearing by using one set or two or more sets as appropriate. As a preferred combination, specifically, in an aliphatic monocarboxylic acid ester compound, n-octanoic acid (2-butyloctyl), n-octanoic acid (2-pentylnonyl), n-octanoic acid (2-hexyldecyl) , N-octanoic acid (2-heptylundecyl), n-octanoic acid (2-octyldodecyl), n-octanoic acid (2-nonyltridecyl), n-octanoic acid (2-decyltetradecyl), n-nonanoic acid (2-butyloctyl), n-nonanoic acid (2-pentylnonyl), n-nonanoic acid (2-hexyldecyl), n-nonanoic acid (2-heptylundecyl), n-nonanoic acid (2-octyldodecyl) ), N-nonanoic acid (2-nonyltridecyl), n-nonanoic acid (2-decyltetradecyl), n-decanoic acid (2-butyloctyl), n-decane (2-pentylnonyl), n-decanoic acid (2-hexyldecyl), n-decanoic acid (2-heptylundecyl), n-decanoic acid (2-octyldodecyl), n-decanoic acid (2-nonyltridecyl) , N-decanoic acid (2-decyltetradecyl), n-undecanoic acid (2-butyloctyl), n-undecanoic acid (2-pentylnonyl), n-undecanoic acid (2-hexyldecyl), n-undecanoic acid (2-heptylundecyl), n-undecanoic acid (2-octyldodecyl), n-undecanoic acid (2-nonyltridecyl), n-undecanoic acid (2-decyltetradecyl), n-dodecanoic acid (2-butyloctyl) ), N-dodecanoic acid (2-pentylnonyl), n-dodecanoic acid (2-hexyldecyl), n-dodecanoic acid (2-heptylundecyl), -Dodecanoic acid (2-octyldodecyl), n-dodecanoic acid (2-nonyltridecyl), n-dodecanoic acid (2-decyltetradecyl), n-tridecanoic acid (2-butyloctyl), n-tridecanoic acid (2- Pentylnonyl), n-tridecanoic acid (2-hexyldecyl), n-tridecanoic acid (2-heptylundecyl), n-tridecanoic acid (2-octyldodecyl), n-tridecanoic acid (2-nonyltridecyl), n- Tetradecanoic acid (2-butyloctyl), n-tetradecanoic acid (2-pentylnonyl), n-tetradecanoic acid (2-hexyldecyl), n-tetradecanoic acid (2-heptylundecyl), n-tetradecanoic acid (2- Octyldodecyl), n-pentadecanoic acid (2-butyloctyl), n-pentadecanoic acid (2-pentylnonyl) , N-pentadecanoic acid (2-hexyldecyl), n-pentadecanoic acid (2-heptylundecyl), n-pentadecanoic acid (2-octyldodecyl), n-hexadecanoic acid (2-butyloctyl), n-hexadecanoic acid (2-pentylnonyl), n-hexadecanoic acid (2-hexyldecyl), n-hexadecanoic acid (2-heptylundecyl), n-heptadecanoic acid (2-butyloctyl), n-heptadecanoic acid (2-pentylnonyl) ), At least one selected from the group consisting of n-heptadecanoic acid (2-hexyldecyl) and n-heptadecanoic acid (2-heptylundecyl), and a methylpentanediol diester compound, Pentanediol di (n-octanoate), 3-methyl-1,5-pentanediol di n-nonanoate), 3-methyl-1,5-pentanediol di (n-decanoate), 3-methyl-1,5-pentanediol di (n-undecanoate), 3-methyl-1,5-pentanediol di (N-dodecanoate), diester of 3-methyl-1,5-pentanediol with n-octanoic acid and n-nonanoic acid, 3-methyl-1,5-pentanediol with n-octanoic acid and n-decanoic acid Diester of 3-methyl-1,5-pentanediol with n-octanoic acid and n-undecanoic acid, 3-methyl-1,5-pentanediol with n-octanoic acid and n-dodecanoic acid Diester, diester of 3-methyl-1,5-pentanediol with n-nonanoic acid and n-decanoic acid, 3-methyl-1,5-pentanedioe Diester of n-nonanoic acid and n-undecanoic acid, diester of 3-methyl-1,5-pentanediol and n-nonanoic acid and n-dodecanoic acid, 3-methyl-1,5-pentanediol and n Diesters of decanoic acid and n-undecanoic acid, diesters of 3-methyl-1,5-pentanediol and n-decanoic acid and n-dodecanoic acid and 3-methyl-1,5-pentanediol and n-undecane A combination with at least one selected from the group consisting of an acid and a diester with n-dodecanoic acid is recommended, and more preferable combinations include n-octanoic acid (2-pentylnonyl) and n-octanoic acid (2-hexyl). Decyl), n-octanoic acid (2-heptylundecyl), n-octanoic acid (2-octyldodecyl), n-octanoic acid (2-nonyl) Tridecyl), n-nonanoic acid (2-pentylnonyl), n-nonanoic acid (2-hexyldecyl), n-nonanoic acid (2-heptylundecyl), n-nonanoic acid (2-octyldodecyl), n- Nonanoic acid (2-nonyltridecyl), n-decanoic acid (2-butyloctyl), n-decanoic acid (2-pentylnonyl), n-decanoic acid (2-hexyldecyl), n-decanoic acid (2-heptylunyl) Decyl), n-decanoic acid (2-octyldodecyl), n-undecanoic acid (2-butyloctyl), n-undecanoic acid (2-pentylnonyl), n-undecanoic acid (2-hexyldecyl), n-undecane Acid (2-heptylundecyl), n-dodecanoic acid (2-butyloctyl), n-dodecanoic acid (2-pentylnonyl) and n-dodecanoic acid (2-hexyldecyl) And at least one selected from the group consisting of 3-methyl-1,5-pentanediol di (n-nonanoate) and 3-methyl-1,5-pentanediol di (n-decanoate) ), 3-methyl-1,5-pentanediol di (n-undecanoate), diesters of 3-methyl-1,5-pentanediol with n-octanoic acid and n-nonanoic acid, 3-methyl-1,5 A diester of pentanediol with n-octanoic acid and n-decanoic acid, a diester of 3-methyl-1,5-pentanediol with n-octanoic acid and n-undecanoic acid, 3-methyl-1,5-pentane Diesters of diol with n-nonanoic acid and n-decanoic acid, 3-methyl-1,5-pentanediol with n-nonanoic acid and n Combination of at least one selected from the group consisting of diesters of diesters of undecanoic acid and 3-methyl-1,5-pentanediol and n- decanoic acid and n- undecanoic acid is recommended.

More specific examples of the combination of the aliphatic monocarboxylic acid ester compound and the methylpentanediol diester compound include n-octanoic acid (2-butyloctyl) and 3-methyl-1,5-pentanediol di (n- Octanoate), n-octanoic acid (2-butyloctyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-octanoic acid (2-butyloctyl) and 3-methyl-1,5- Pentanediol di (n-decanoate), n-octanoic acid (2-butyloctyl) and 3-methyl-1,5-pentanediol di (n-undecanoate), n-octanoic acid (2-butyloctyl) and 3- Methyl-1,5-pentanediol di (n-dodecanoate), n-octanoic acid (2-pentylnonyl) and 3-methyl 1,5-pentanediol di (n-octanoate), n-octanoic acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-octanoic acid (2-pentylnonyl) ) And 3-methyl-1,5-pentanediol di (n-decanoate), n-octanoic acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (n-undecanoate), n-octane Acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-octanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n- Octanoate), n-octanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-octanoic acid (2 Hexyldecyl) and 3-methyl-1,5-pentanediol di (n-decanoate), n-octanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n-undecanoate), n -Octanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-octanoic acid (2-heptylundecyl) and 3-methyl-1,5-pentanediol di (N-octanoate), n-octanoic acid (2-heptylundecyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-octanoic acid (2-heptylundecyl) and 3-methyl -1,5-pentanediol di (n-decanoate), n-octanoic acid (2-heptylundecyl) and 3-methyl-1,5-pentanediol Di (n-undecanoate), n-octanoic acid (2-heptylundecyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-octanoic acid (2-octyldodecyl) and 3-methyl 1,5-pentanediol di (n-octanoate), n-octanoic acid (2-octyldodecyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-octanoic acid (2-octyl) Dodecyl) and 3-methyl-1,5-pentanediol di (n-decanoate), n-octanoic acid (2-octyldodecyl) and 3-methyl-1,5-pentanediol di (n-undecanoate), n- Octanoic acid (2-octyldodecyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-octanoic acid (2-nonyl) Ridecyl) and 3-methyl-1,5-pentanediol di (n-octanoate), n-octanoic acid (2-nonyltridecyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-octane Acid (2-nonyltridecyl) and 3-methyl-1,5-pentanediol di (n-decanoate), n-octanoic acid (2-nonyltridecyl) and 3-methyl-1,5-pentanediol di (n-undecanoate) N-octanoic acid (2-nonyltridecyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-octanoic acid (2-decyltetradecyl) and 3-methyl-1,5-pentanediol Di (n-octanoate), n-octanoic acid (2-decyltetradecyl) and 3-methyl-1,5-pentanediol di n-nonanoate), n-octanoic acid (2-decyltetradecyl) and 3-methyl-1,5-pentanediol di (n-decanoate), n-octanoic acid (2-decyltetradecyl) and 3-methyl- 1,5-pentanediol di (n-undecanoate), n-octanoic acid (2-decyltetradecyl)) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-nonanoic acid (2- Butyloctyl) and 3-methyl-1,5-pentanediol di (n-octanoate), n-nonanoic acid (2-butyloctyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n Nonanoic acid (2-butyloctyl) and 3-methyl-1,5-pentanediol di (n-decanoate), n-nonanoic acid (2-butyloctyl) and 3-methyl Til-1,5-pentanediol di (n-undecanoate), n-nonanoic acid (2-butyloctyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-nonanoic acid (2- Pentylnonyl) and 3-methyl-1,5-pentanediol di (n-octanoate), n-nonanoic acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n Nonanoic acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (n-decanoate), n-nonanoic acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di ( n-undecanoate), n-nonanoic acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-nonanoic acid (2-hexanoic acid) Ludecyl) and 3-methyl-1,5-pentanediol di (n-octanoate), n-nonanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n- Nonanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n-decanoate), n-nonanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n -Undecanoate), n-nonanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-nonanoic acid (2-heptylundecyl) and 3-methyl-1, 5-pentanediol di (n-octanoate), n-nonanoic acid (2-heptylundecyl) and 3-methyl-1,5-pentanediol di (n-nonanoate) n-nonanoic acid (2-heptylundecyl) and 3-methyl-1,5-pentanediol di (n-decanoate), n-nonanoic acid (2-heptylundecyl) and 3-methyl-1,5-pentane Diol di (n-undecanoate), n-nonanoic acid (2-heptylundecyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-nonanoic acid (2-octyldodecyl) and 3- Methyl-1,5-pentanediol di (n-octanoate), n-nonanoic acid (2-octyldodecyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-nonanoic acid (2- Octyldodecyl) and 3-methyl-1,5-pentanediol di (n-decanoate), n-nonanoic acid (2-octyldodecyl) and 3-methyl-1,5-penta Didiol (n-undecanoate), n-nonanoic acid (2-octyldodecyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-nonanoic acid (2-nonyltridecyl) and 3-methyl-1 , 5-pentanediol di (n-octanoate), n-nonanoic acid (2-nonyltridecyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-nonanoic acid (2-nonyltridecyl) and 3 -Methyl-1,5-pentanediol di (n-decanoate), n-nonanoic acid (2-nonyltridecyl) and 3-methyl-1,5-pentanediol di (n-undecanoate), n-nonanoic acid (2- Nonyltridecyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-nonanoic acid (2-decyltetra) Syl) and 3-methyl-1,5-pentanediol di (n-octanoate), n-nonanoic acid (2-decyltetradecyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n Nonanoic acid (2-decyltetradecyl) and 3-methyl-1,5-pentanediol di (n-decanoate), n-nonanoic acid (2-decyltetradecyl) and 3-methyl-1,5-pentanediol Di (n-undecanoate) n-nonanoic acid (2-decyltetradecyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-decanoic acid (2-butyloctyl) and 3-methyl- 1,5-pentanediol di (n-octanoate), n-decanoic acid (2-butyloctyl) and 3-methyl-1,5-pentanediol di (n-nonanoate) N-decanoic acid (2-butyloctyl) and 3-methyl-1,5-pentanediol di (n-decanoate), n-decanoic acid (2-butyloctyl) and 3-methyl-1,5-pentanediol Di (n-undecanoate), n-decanoic acid (2-butyloctyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-decanoic acid (2-pentylnonyl) and 3-methyl- 1,5-pentanediol di (n-octanoate), n-decanoic acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-decanoic acid (2-pentylnonyl) ) And 3-methyl-1,5-pentanediol di (n-decanoate), n-decanoic acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (n- Undecanoate), n-decanoic acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-decanoic acid (2-hexyldecyl) and 3-methyl-1,5- Pentanediol di (n-octanoate), n-decanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-decanoic acid (2-hexyldecyl) and 3- Methyl-1,5-pentanediol di (n-decanoate), n-decanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n-undecanoate), n-decanoic acid (2- (Hexyldecyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-decanoic acid (2-heptylundecyl) and 3-methyl-1,5- N-dioldiol (n-octanoate), n-decanoic acid (2-heptylundecyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-decanoic acid (2-heptylundecyl) and 3- Methyl-1,5-pentanediol di (n-decanoate), n-decanoic acid (2-heptylundecyl) and 3-methyl-1,5-pentanediol di (n-undecanoate), n-decanoic acid (2 -Heptylundecyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-decanoic acid (2-octyldodecyl) and 3-methyl-1,5-pentanediol di (n-octanoate) N-decanoic acid (2-octyldodecyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-decanoic acid (2-o Tildodecyl) and 3-methyl-1,5-pentanediol di (n-decanoate), n-decanoic acid (2-octyldodecyl) and 3-methyl-1,5-pentanediol di (n-undecanoate), n- Decanoic acid (2-octyldodecyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-decanoic acid (2-nonyltridecyl) and 3-methyl-1,5-pentanediol di (n- Octanoate), n-decanoic acid (2-nonyltridecyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-decanoic acid (2-nonyltridecyl) and 3-methyl-1,5-pentanediol Di (n-decanoate), n-decanoic acid (2-nonyltridecyl) and 3-methyl-1,5-pentanediol di (n-undecano) Ate), n-decanoic acid (2-nonyltridecyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-decanoic acid (2-decyltetradecyl) and 3-methyl-1,5- Pentanediol di (n-octanoate), n-decanoic acid (2-decyltetra)
Decyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-decanoic acid (2-decyltetradecyl) and 3-methyl-1,5-pentanediol di (n-decanoate), n Decanoic acid (2-decyltetradecyl) and 3-methyl-1,5-pentanediol di (n-undecanoate) n-decanoic acid (2-decyltetradecyl) and 3-methyl-1,5-pentanediol di (N-dodecanoate), n-undecanoic acid (2-butyloctyl) and 3-methyl-1,5-pentanediol di (n-octanoate), n-undecanoic acid (2-butyloctyl) and 3-methyl-1 , 5-pentanediol di (n-nonanoate), n-undecanoic acid (2-butyloctyl) and 3-methyl-1,5-pentanediol di (n-decano) N-undecanoic acid (2-butyloctyl) and 3-methyl-1,5-pentanediol di (n-undecanoate), n-undecanoic acid (2-butyloctyl) and 3-methyl-1,5 -Pentanediol di (n-dodecanoate), n-undecanoic acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (n-octanoate), n-undecanoic acid (2-pentylnonyl) and 3 -Methyl-1,5-pentanediol di (n-nonanoate), n-undecanoic acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (n-decanoate), n-undecanoic acid (2 -Pentylnonyl) and 3-methyl-1,5-pentanediol di (n-undecanoate), n-undecanoic acid (2-pentylnonyl) and 3- Til-1,5-pentanediol di (n-dodecanoate), n-undecanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n-octanoate), n-undecanoic acid (2- Hexyldecyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-undecanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n-decanoate), n -Undecanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n-undecanoate), n-undecanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di ( n-dodecanoate), n-undecanoic acid (2-heptylundecyl) and 3-methyl-1,5-pentanediol di (n-octanoate) ), N-undecanoic acid (2-heptylundecyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-undecanoic acid (2-heptylundecyl) and 3-methyl-1,5 -Pentanediol di (n-decanoate), n-undecanoic acid (2-heptylundecyl) and 3-methyl-1,5-pentanediol di (n-undecanoate), n-undecanoic acid (2-heptylundecyl) And 3-methyl-1,5-pentanediol di (n-dodecanoate), n-undecanoic acid (2-octyldodecyl) and 3-methyl-1,5-pentanediol di (n-octanoate), n-undecanoic acid (2-octyldodecyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-undecanoic acid (2-octyldode) And 3-methyl-1,5-pentanediol di (n-decanoate), n-undecanoic acid (2-octyldodecyl) and 3-methyl-1,5-pentanediol di (n-undecanoate), n- Undecanoic acid (2-octyldodecyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-undecanoic acid (2-nonyltridecyl) and 3-methyl-1,5-pentanediol di (n- Octanoate), n-undecanoic acid (2-nonyltridecyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-undecanoic acid (2-nonyltridecyl) and 3-methyl-1,5-pentanediol Di (n-decanoate), n-undecanoic acid (2-nonyltridecyl) and 3-methyl-1,5-pentanediol di n-undecanoate), n-undecanoic acid (2-nonyltridecyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-undecanoic acid (2-decyltetradecyl) and 3-methyl-1, 5-pentanediol di (n-octanoate), n-undecanoic acid (2-decyltetradecyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-undecanoic acid (2-decyltetradecyl) ) And 3-methyl-1,5-pentanediol di (n-decanoate), n-undecanoic acid (2-decyltetradecyl) and 3-methyl-1,5-pentanediol di (n-undecanoate) n-undecane Acid (2-decyltetradecyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-dodecane Acid (2-butyloctyl) and 3-methyl-1,5-pentanediol di (n-octanoate), n-dodecanoic acid (2-butyloctyl) and 3-methyl-1,5-pentanediol di (n- Nonanoate), n-dodecanoic acid (2-butyloctyl) and 3-methyl-1,5-pentanediol di (n-decanoate), n-dodecanoic acid (2-butyloctyl) and 3-methyl-1,5- Pentanediol di (n-undecanoate), n-dodecanoic acid (2-butyloctyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-dodecanoic acid (2-pentylnonyl) and 3- Methyl-1,5-pentanediol di (n-octanoate), n-dodecanoic acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (n Nonanoate), n-dodecanoic acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (n-decanoate), n-dodecanoic acid (2-pentylnonyl) and 3-methyl-1,5- Pentanediol di (n-undecanoate), n-dodecanoic acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-dodecanoic acid (2-hexyldecyl) and 3- Methyl-1,5-pentanediol di (n-octanoate), n-dodecanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-dodecanoic acid (2- (Hexyldecyl) and 3-methyl-1,5-pentanediol di (n-decanoate), n-dodecanoic acid (2-hexyldecyl) and 3-methyl-1 5-pentanediol di (n-undecanoate), n-dodecanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-dodecanoic acid (2-heptylundecyl) And 3-methyl-1,5-pentanediol di (n-octanoate), n-dodecanoic acid (2-heptylundecyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-dodecane Acid (2-heptylundecyl) and 3-methyl-1,5-pentanediol di (n-decanoate), n-dodecanoic acid (2-heptylundecyl) and 3-methyl-1,5-pentanediol di ( n-undecanoate), n-dodecanoic acid (2-heptylundecyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-dodecanoic acid (2-octyldodecyl) and 3-methyl-1,5-pentanediol di (n-octanoate), n-dodecanoic acid (2-octyldodecyl) and 3-methyl-1,5-pentanediol di (N-nonanoate), n-dodecanoic acid (2-octyldodecyl) and 3-methyl-1,5-pentanediol di (n-decanoate), n-dodecanoic acid (2-octyldodecyl) and 3-methyl-1 , 5-pentanediol di (n-undecanoate), n-dodecanoic acid (2-octyldodecyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-dodecanoic acid (2-nonyltridecyl) 3-methyl-1,5-pentanediol di (n-octanoate), n-dodecanoic acid (2-nonyltridecyl) and 3-methyl-1, -Pentanediol di (n-nonanoate), n-dodecanoic acid (2-nonyltridecyl) and 3-methyl-1,5-pentanediol di (n-decanoate), n-dodecanoic acid (2-nonyltridecyl) and 3-methyl 1,5-pentanediol di (n-undecanoate), n-dodecanoic acid (2-nonyltridecyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-dodecanoic acid (2-decyltetra) Decyl) and 3-methyl-1,5-pentanediol di (n-octanoate), n-dodecanoic acid (2-decyltetradecyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n -Dodecanoic acid (2-decyltetradecyl) and 3-methyl-1,5-pentanediol di (n-decanoate), n-dode Acid (2-decyltetradecyl) and 3-methyl-1,5-pentanediol di (n-undecanoate) n-dodecanoic acid (2-decyltetradecyl) and 3-methyl-1,5-pentanediol di ( n-dodecanoate), n-tridecanoic acid (2-butyloctyl) and 3-methyl-1,5-pentanediol di (n-octanoate), n-tridecanoic acid (2-butyloctyl) and 3-methyl-1, 5-pentanediol di (n-nonanoate), n-tridecanoic acid (2-butyloctyl) and 3-methyl-1,5-pentanediol di (n-decanoate), n-tridecanoic acid (2-butyloctyl) 3-methyl-1,5-pentanediol di (n-undecanoate), n-tridecanoic acid (2-butyloctyl) and 3-methyl-1,5-pe N-dioldiol (n-dodecanoate), n-tridecanoic acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (n-octanoate), n-tridecanoic acid (2-pentylnonyl) and 3-methyl- 1,5-pentanediol di (n-nonanoate), n-tridecanoic acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (n-decanoate), n-tridecanoic acid (2-pentylnonyl) ) And 3-methyl-1,5-pentanediol di (n-undecanoate), n-tridecanoic acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-tridecane Acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n-octanoate), n-tridecanoic acid 2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-tridecanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n-decanoate) N-tridecanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n-undecanoate), n-tridecanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol Di (n-dodecanoate), n-tridecanoic acid (2-heptylundecyl) and 3-methyl-1,5-pentanediol di (n-octanoate), n-tridecanoic acid (2-heptylundecyl) and 3- Methyl-1,5-pentanediol di (n-nonanoate), n-tridecanoic acid (2-heptylundecyl) and 3-methyl-1,5-pe Tandiol di (n-decanoate), n-tridecanoic acid (2-heptylundecyl) and 3-methyl-1,5-pentanediol di (n-undecanoate), n-tridecanoic acid (2-heptylundecyl) and 3- Methyl-1,5-pentanediol di (n-dodecanoate), n-tridecanoic acid (2-octyldodecyl) and 3-methyl-1,5-pentanediol di (n-octanoate), n-tridecanoic acid (2- Octyldodecyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-tridecanoic acid (2-octyldodecyl) and 3-methyl-1,5-pentanediol di (n-decanoate), n Tridecanoic acid (2-octyldodecyl) and 3-methyl-1,5-pentanediol di (n-undecanoate), n -Tridecanoic acid (2-octyldodecyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-tridecanoic acid (2-nonyltridecyl) and 3-methyl-1,5-pentanediol di (n -Octanoate), n-tridecanoic acid (2-nonyltridecyl)
And 3-methyl-1,5-pentanediol di (n-nonanoate), n-tridecanoic acid (2-nonyltridecyl) and 3-methyl-1,5-pentanediol di (n-decanoate), n-tridecane Acid (2-nonyltridecyl) and 3-methyl-1,5-pentanediol di (n-undecanoate), n-tridecanoic acid (2-nonyltridecyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate) N-tetradecanoic acid (2-butyloctyl) and 3-methyl-1,5-pentanediol di (n-octanoate), n-tetradecanoic acid (2-butyloctyl) and 3-methyl-1,5-pentanediol Di (n-nonanoate), n-tetradecanoic acid (2-butyloctyl) and 3-methyl-1,5-pentanediol di ( -Decanoate), n-tetradecanoic acid (2-butyloctyl) and 3-methyl-1,5-pentanediol di (n-undecanoate), n-tetradecanoic acid (2-butyloctyl) and 3-methyl-1,5 -Pentanediol di (n-dodecanoate), n-tetradecanoic acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (n-octanoate), n-tetradecanoic acid (2-pentylnonyl) and 3 -Methyl-1,5-pentanediol di (n-nonanoate), n-tetradecanoic acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (n-decanoate), n-tetradecanoic acid (2 -Pentylnonyl) and 3-methyl-1,5-pentanediol di (n-undecanoate), n-tetradecanoic acid (2 Pentylnonyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-tetradecanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n-octanoate), n -Tetradecanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-tetradecanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di ( n-decanoate), n-tetradecanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n-undecanoate), n-tetradecanoic acid (2-hexyldecyl) and 3-methyl-1, 5-pentanediol di (n-dodecanoate), n-tetradecanoic acid (2-heptylundecyl) and 3-methyl-1,5-pe Ntandioldi (n-octanoate), n-tetradecanoic acid (2-heptylundecyl) and 3-methyl-1,5-pentanedioldi (n-nonanoate), n-tetradecanoic acid (2-heptylundecyl) and 3- Methyl-1,5-pentanediol di (n-decanoate), n-tetradecanoic acid (2-heptylundecyl) and 3-methyl-1,5-pentanediol di (n-undecanoate), n-tetradecanoic acid (2 -Heptylundecyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-tetradecanoic acid (2-octyldodecyl) and 3-methyl-1,5-pentanediol di (n-octanoate) N-tetradecanoic acid (2-octyldodecyl) and 3-methyl-1,5-pentanediol di (n-no Noate), n-tetradecanoic acid (2-octyldodecyl) and 3-methyl-1,5-pentanediol di (n-decanoate), n-tetradecanoic acid (2-octyldodecyl) and 3-methyl-1,5- Pentanediol di (n-undecanoate), n-tetradecanoic acid (2-octyldodecyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-pentadecanoic acid (2-butyloctyl) and 3- Methyl-1,5-pentanediol di (n-octanoate), n-pentadecanoic acid (2-butyloctyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-pentadecanoic acid (2- Butyloctyl) and 3-methyl-1,5-pentanediol di (n-decanoate), n-pentadecanoic acid (2-butyloctyl) Luoctyl) and 3-methyl-1,5-pentanediol di (n-undecanoate), n-pentadecanoic acid (2-butyloctyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n- Pentadecanoic acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (n-octanoate), n-pentadecanoic acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (n -Nonanoate), n-pentadecanoic acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (n-decanoate), n-pentadecanoic acid (2-pentylnonyl) and 3-methyl-1,5 -Pentanediol di (n-undecanoate), n-pentadecanoic acid (2-pentylnonyl) and 3-methyl-1,5-pentane Diol di (n-dodecanoate), n-pentadecanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n-octanoate), n-pentadecanoic acid (2-hexyldecyl) and 3-methyl- 1,5-pentanediol di (n-nonanoate), n-pentadecanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n-decanoate), n-pentadecanoic acid (2-hexyldecyl) ) And 3-methyl-1,5-pentanediol di (n-undecanoate), n-pentadecanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-pentadecane Acid (2-heptylundecyl) and 3-methyl-1,5-pentanediol di (n-octanoate), n-pe Tadecanoic acid (2-heptylundecyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-pentadecanoic acid (2-heptylundecyl) and 3-methyl-1,5-pentanediol di (N-decanoate), n-pentadecanoic acid (2-heptylundecyl) and 3-methyl-1,5-pentanediol di (n-undecanoate), n-pentadecanoic acid (2-heptylundecyl) and 3-methyl 1,5-pentanediol di (n-dodecanoate), n-pentadecanoic acid (2-octyldodecyl) and 3-methyl-1,5-pentanediol di (n-octanoate), n-pentadecanoic acid (2-octyl) Dodecyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-pentadecanoic acid (2-octyl) Decyl) and 3-methyl-1,5-pentanediol di (n-decanoate), n-pentadecanoic acid (2-octyldodecyl) and 3-methyl-1,5-pentanediol di (n-undecanoate), n- Pentadecanoic acid (2-octyldodecyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-hexadecanoic acid (2-butyloctyl) and 3-methyl-1,5-pentanediol di (n -Octanoate), n-hexadecanoic acid (2-butyloctyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-hexadecanoic acid (2-butyloctyl) and 3-methyl-1,5 -Pentanediol di (n-decanoate), n-hexadecanoic acid (2-butyloctyl) and 3-methyl-1,5-pentanedio Aldehyde (n-undecanoate), n-hexadecanoic acid (2-butyloctyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-hexadecanoic acid (2-pentylnonyl) and 3-methyl- 1,5-pentanediol di (n-octanoate), n-hexadecanoic acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-hexadecanoic acid (2-pentylnonyl) ) And 3-methyl-1,5-pentanediol di (n-decanoate), n-hexadecanoic acid (2-pentylnonyl), 3-methyl-1,5-pentanediol di (n-undecanoate), n-hexadecane Acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-hexade Acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n-octanoate), n-hexadecanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n -Nonanoate), n-hexadecanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n-decanoate), n-hexadecanoic acid (2-hexyldecyl) and 3-methyl-1,5 -Pentanediol di (n-undecanoate), n-hexadecanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-hexadecanoic acid (2-heptylundecyl) 3-methyl-1,5-pentanediol di (n-octanoate), n-hexadecanoic acid (2-heptylundecyl) and 3-methyl 1,5-pentanediol di (n-nonanoate), n-hexadecanoic acid (2-heptylundecyl) and 3-methyl-1,5-pentanediol di (n-decanoate), n-hexadecanoic acid (2 -Heptylundecyl) and 3-methyl-1,5-pentanediol di (n-undecanoate), n-hexadecanoic acid (2-heptylundecyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate) ), N-heptadecanoic acid (2-butyloctyl) and 3-methyl-1,5-pentanediol di (n-octanoate), n-heptadecanoic acid (2-butyloctyl) and 3-methyl-1,5-pentane Diol di (n-nonanoate), n-heptadecanoic acid (2-butyloctyl) and 3-methyl-1,5-pentanediol di (n -Decanoate), n-heptadecanoic acid (2-butyloctyl) and 3-methyl-1,5-pentanediol di (n-undecanoate), n-heptadecanoic acid (2-butyloctyl) and 3-methyl-1,5 -Pentanediol di (n-dodecanoate), n-heptadecanoic acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (n-octanoate), n-heptadecanoic acid (2-pentylnonyl) and 3 -Methyl-1,5-pentanediol di (n-nonanoate), n-heptadecanoic acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (n-decanoate), n-heptadecanoic acid (2 -Pentylnonyl) and 3-methyl-1,5-pentanediol di (n-undecanoate), n-heptadecanoic acid (2- N-thyl nonyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-heptadecanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n-octanoate), n- Heptadecanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-heptadecanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n -Decanoate), n-heptadecanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n-undecanoate), n-heptadecanoic acid (2-hexyldecyl) and 3-methyl-1,5 -Pentanediol di (n-dodecanoate), n-heptadecanoic acid (2-heptylundecyl) and 3-methyl-1,5-pe Tandiol di (n-octanoate), n-heptadecanoic acid (2-heptylundecyl) and 3-methyl-1,5-pentanedioldi (n-nonanoate), n-heptadecanoic acid (2-heptylundecyl) and 3- Methyl-1,5-pentanediol di (n-decanoate), n-heptadecanoic acid (2-heptylundecyl) and 3-methyl-1,5-pentanediol di (n-undecanoate), n-heptadecanoic acid (2 -Heptylundecyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate). Among them, particularly preferred are n-octanoic acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (n-octanoate), n-octanoic acid (2-pentylnonyl) and 3-methyl. 1,5-pentanediol di (n-nonanoate), n-octanoic acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (n-decanoate), n-octanoic acid (2-pentyl) Nonyl) and 3-methyl-1,5-pentanediol di (n-undecanoe)
N-octanoic acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-octanoic acid (2-hexyldecyl) and 3-methyl-1,5 -Pentanediol di (n-octanoate), n-octanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-octanoic acid (2-hexyldecyl) and 3 -Methyl-1,5-pentanediol di (n-decanoate), n-octanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n-undecanoate), n-octanoic acid (2 -Hexyldecyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-octanoic acid (2-heptylundecyl) and 3-methyl-1,5 Pentanediol di (n-octanoate), n-octanoic acid (2-heptylundecyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-octanoic acid (2-heptylundecyl) 3-methyl-1,5-pentanediol di (n-decanoate), n-octanoic acid (2-heptylundecyl) and 3-methyl-1,5-pentanediol di (n-undecanoate), n-octanoic acid (2-heptylundecyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-octanoic acid (2-octyldodecyl) and 3-methyl-1,5-pentanediol di (n- Octanoate), n-octanoic acid (2-octyldodecyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-o Tanic acid (2-octyldodecyl) and 3-methyl-1,5-pentanediol di (n-decanoate), n-octanoic acid (2-octyldodecyl) and 3-methyl-1,5-pentanediol di (n -Undecanoate), n-octanoic acid (2-octyldodecyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-octanoic acid (2-nonyltridecyl) and 3-methyl-1,5- Pentanediol di (n-octanoate), n-octanoic acid (2-nonyltridecyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-octanoic acid (2-nonyltridecyl) and 3-methyl- 1,5-pentanediol di (n-decanoate), n-octanoic acid (2-nonyltridecyl) and 3-methyl-1,5-penta Didiol (n-undecanoate), n-octanoic acid (2-nonyltridecyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-nonanoic acid (2-pentylnonyl) and 3-methyl-1 , 5-pentanediol di (n-octanoate), n-nonanoic acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-nonanoic acid (2-pentylnonyl) And 3-methyl-1,5-pentanediol di (n-decanoate), n-nonanoic acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (n-undecanoate), n-nonanoic acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-nonanoic acid (2-hexyldecyl) and 3 Methyl-1,5-pentanediol di (n-octanoate), n-nonanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-nonanoic acid (2- Hexyldecyl) and 3-methyl-1,5-pentanediol di (n-decanoate), n-nonanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n-undecanoate), n Nonanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-nonanoic acid (2-heptylundecyl) and 3-methyl-1,5-pentanediol di (N-octanoate), n-nonanoic acid (2-heptylundecyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-nonanoic acid ( -Heptylundecyl) and 3-methyl-1,5-pentanediol di (n-decanoate), n-nonanoic acid (2-heptylundecyl) and 3-methyl-1,5-pentanediol di (n-undecanoate) ), N-nonanoic acid (2-heptylundecyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-nonanoic acid (2-octyldodecyl) and 3-methyl-1,5- Pentanediol di (n-octanoate), n-nonanoic acid (2-octyldodecyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-nonanoic acid (2-octyldodecyl) and 3- Methyl-1,5-pentanediol di (n-decanoate), n-nonanoic acid (2-octyldodecyl) and 3-methyl-1,5-pentanediol di (n -Undecanoate), n-nonanoic acid (2-octyldodecyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-nonanoic acid (2-nonyltridecyl) and 3-methyl-1,5- Pentanediol di (n-octanoate), n-nonanoic acid (2-nonyltridecyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-nonanoic acid (2-nonyltridecyl) and 3-methyl- 1,5-pentanediol di (n-decanoate), n-nonanoic acid (2-nonyltridecyl) and 3-methyl-1,5-pentanediol di (n-undecanoate), n-nonanoic acid (2-nonyltridecyl) 3-methyl-1,5-pentanediol di (n-dodecanoate), n-decanoic acid (2-butyloctyl) and 3-methyl 1,5-pentanediol di (n-octanoate), n-decanoic acid (2-butyloctyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-decanoic acid (2-butyloctyl) ) And 3-methyl-1,5-pentanediol di (n-decanoate), n-decanoic acid (2-butyloctyl) and 3-methyl-1,5-pentanediol di (n-undecanoate), n-decane Acid (2-butyloctyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-decanoic acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (n- Octanoate), n-decanoic acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-decanoic acid (2-pentylnoni) ) And 3-methyl-1,5-pentanediol di (n-decanoate), n-decanoic acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (n-undecanoate), n-decane Acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-decanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n- Octanoate), n-decanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-decanoic acid (2-hexyldecyl) and 3-methyl-1,5- Pentanediol di (n-decanoate), n-decanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n-undecanoate), n-decanoic acid ( 2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-decanoic acid (2-heptylundecyl) and 3-methyl-1,5-pentanediol di (n-octanoate) ), N-decanoic acid (2-heptylundecyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-decanoic acid (2-heptylundecyl) and 3-methyl-1,5 -Pentanediol di (n-decanoate), n-decanoic acid (2-heptylundecyl) and 3-methyl-1,5-pentanediol di (n-undecanoate), n-decanoic acid (2-heptylundecyl) And 3-methyl-1,5-pentanediol di (n-dodecanoate), n-decanoic acid (2-octyldodecyl) and 3-methyl-1,5-pentanediol (N-octanoate), n-decanoic acid (2-octyldodecyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-decanoic acid (2-octyldodecyl) and 3-methyl-1 , 5-pentanediol di (n-decanoate), n-decanoic acid (2-octyldodecyl) and 3-methyl-1,5-pentanediol di (n-undecanoate), n-decanoic acid (2-octyldodecyl) And 3-methyl-1,5-pentanediol di (n-dodecanoate), n-undecanoic acid (2-butyloctyl) and 3-methyl-1,5-pentanediol di (n-octanoate), n-undecanoic acid (2-butyloctyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-undecanoic acid (2-butyloctyl) -Methyl-1,5-pentanediol di (n-decanoate), n-undecanoic acid (2-butyloctyl) and 3-methyl-1,5-pentanediol di (n-undecanoate), n-undecanoic acid (2 -Butyloctyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-undecanoic acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (n-octanoate), n-undecanoic acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-undecanoic acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (N-decanoate), n-undecanoic acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (n-undecanoate) ), N-undecanoic acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-undecanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentane Diol di (n-octanoate), n-undecanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-undecanoic acid (2-hexyldecyl) and 3-methyl 1,5-pentanediol di (n-decanoate), n-undecanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n-undecanoate), n-undecanoic acid (2-hexyl) Decyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-undecanoic acid (2-heptylundecyl) and 3-methyl 1,5-pentanediol di (n-octanoate), n-undecanoic acid (2-heptylundecyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-undecanoic acid (2- Heptylundecyl) and 3-methyl-1,5-pentanediol di (n-decanoate), n-undecanoic acid (2-heptylundecyl) and 3-methyl-1,5-pentanediol di (n-undecanoate) N-undecanoic acid (2-heptylundecyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-dodecanoic acid (2-butyloctyl) and 3-methyl-1,5-pentane Diol di (n-octanoate), n-dodecanoic acid (2-butyloctyl) and 3-methyl-1,5-pentanediol di (n-nonanoe) G), n-dodecanoic acid (2-butyloctyl) and 3-methyl-1,5-pentanediol di (n-decanoate), n-dodecanoic acid (2-butyloctyl) and 3-methyl-1,5- Pentanediol di (n-undecanoate), n-dodecanoic acid (2-butyloctyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-dodecanoic acid (2-pentylnonyl) and 3- Methyl-1,5-pentanediol di (n-octanoate), n-dodecanoic acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-dodecanoic acid (2- Pentylnonyl) and 3-methyl-1,5-pentanediol di (n-decanoate), n-dodecanoic acid (2-pentylnonyl) and 3-methyl-1,5-penta Didiol (n-undecanoate), n-dodecanoic acid (2-pentylnonyl) and 3-methyl-1,5-pentanediol di (n-dodecanoate), n-dodecanoic acid (2-hexyldecyl) and 3-methyl- 1,5-pentanediol di (n-octanoate), n-
Dodecanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n-nonanoate), n-dodecanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n -Decanoate), n-dodecanoic acid (2-hexyldecyl) and 3-methyl-1,5-pentanediol di (n-undecanoate), n-dodecanoic acid (2-hexyldecyl) and 3-methyl-1,5 -Pentanediol di (n-dodecanoate).

The lubricating base oil of the present invention is a lubricating base oil containing the above aliphatic monocarboxylic acid ester compound and methylpentanediol diester compound in a weight ratio of 30:70 to 80:20, preferably weight. The ratio is 30:70 to 60:40, and 45:55 to 55:45 is particularly preferable.

In the lubricating base oil for fluid bearings, the total of the aliphatic monocarboxylic acid ester compound and the methylpentanediol diester compound is preferably 90% by weight or more, more preferably 95% by weight or more, particularly 98%. % By weight or more is preferred.

The kinematic viscosity at 40 ° C. of the lubricating base oil of the present invention is preferably in the range of 5 to 15 mm ² / s, more preferably in the range of 6 to 14 mm ² / s, and particularly in the range of 7 to 13 mm ² / s. The When the kinematic viscosity at 40 ° C. is less than 5 mm ² / s, a tendency to decrease the lubricating performance is recognized, and when it exceeds 15 mm ² / s, a tendency to increase the energy loss is recognized. In addition, the said kinematic viscosity is a value obtained by the method described in the postscript Example.

The viscosity index of the lubricating base oil of the present invention is preferably 140 or more, more preferably 145 or more, and particularly preferably 150 or more. The higher the viscosity index, the better the viscosity-temperature characteristics. In addition, the said viscosity index is a value obtained by the method described in the postscript Example.

The low temperature characteristics of the lubricating base oil of the present invention can be evaluated by, for example, the pour point by a low temperature fluidity test. The pour point of the lubricating base oil of the present invention is preferably −10 ° C. or less, more preferably −15 ° C. or less, and particularly preferably −20 ° C. or less. The lower the pour point, the better the low temperature fluidity. The pour point is a value obtained by a low temperature fluidity test described in Examples below.

The hydrolysis stability of the lubricating base oil of the present invention can be evaluated by, for example, the amount of increase in acid value after the hydrolysis test. The amount of increase in acid value after the hydrolysis test of the lubricating base oil of the present invention is preferably 0.70 KOH mg / g or less, more preferably 0.65 KOH mg / g or less, and particularly preferably 0.60 KOH mg / g or less. It is evaluated that the smaller the increase in acid value after the hydrolysis test, the better the hydrolysis stability. In addition, the amount of increase in acid value after the hydrolysis test is a value obtained in the hydrolysis stability test described in the Examples below.

The lubricating oil base oil for fluid bearings of the present invention is suitably used as a lubricating oil base oil for hydrodynamic bearings or sintered oil-impregnated bearings.

[Method for producing ester compound]
Examples of the method for producing the aliphatic monocarboxylic acid ester compound represented by the general formula (1) according to the lubricating base oil of the present invention include a linear aliphatic saturated monocarboxylic acid and a branched aliphatic saturated alcohol. Is produced by an esterification reaction. The manufacturing method is not particularly limited, and a conventionally known manufacturing method can be used.

In carrying out the esterification reaction, after subjecting the linear aliphatic saturated monocarboxylic acid and the branched aliphatic saturated alcohol to an esterification reaction in the presence of an esterification catalyst, post-treatment / purification treatment is carried out, thereby The process of obtaining the aliphatic monocarboxylic acid ester compound which concerns on this is illustrated.

In the esterification reaction, the linear aliphatic saturated monocarboxylic acid is usually 1.0 to 2.0, preferably 1.02 to 1.1, based on 1 mol of the hydroxyl group of the branched aliphatic saturated alcohol. 5 moles are used.

Examples of esterification catalysts include Lewis acids and sulfonic acid derivatives. More specifically, examples of the Lewis acid include aluminum derivatives, tin derivatives, and titanium derivatives. Examples of the sulfonic acid derivative include p-toluenesulfonic acid, methanesulfonic acid, sulfuric acid and the like. The amount used is usually about 0.01 to 5.0% by weight with respect to the total weight of the linear aliphatic saturated monocarboxylic acid and the branched aliphatic saturated alcohol, for example.

The esterification reaction is preferably carried out at a reaction temperature of usually 120 to 250 ° C., preferably 140 to 230 ° C. in the presence of an inert gas. The reaction time is usually about 3 to 30 hours. If necessary, the produced water may be distilled off azeotropically outside the system using a water entraining agent such as benzene, toluene, xylene, cyclohexane and the like.

After completion of the esterification reaction, excess raw material (linear aliphatic saturated monocarboxylic acid) is distilled off under reduced pressure or normal pressure. Subsequently, an aliphatic monocarboxylic acid ester compound can be obtained by a conventional purification method such as neutralization, washing with water, liquid extraction, vacuum distillation, purification of an adsorbent such as activated carbon.

The methylpentanediol diester compound represented by the general formula (2) according to the lubricating base oil of the present invention is converted into 3-methyl-1,5 in the above ester production method by using a branched aliphatic saturated alcohol as 3-methyl-1,5. -A methylpentanediol diester compound can be obtained by performing esterification instead of pentanediol. The production conditions and the like are the same as the conditions and method for producing the aliphatic monocarboxylic acid ester compound.

The lubricating base oil for fluid bearings of the present invention includes mineral oil (hydrocarbon oil obtained by refining petroleum), poly-α-olefin, polybutene, alkylbenzene, alkylnaphthalene, alicyclic hydrocarbon oil, Synthetic hydrocarbon oils such as isomerized oils of synthetic hydrocarbons obtained by the Fischer-Tropsch process, animal and vegetable oils, organic acid esters other than the present ester (aliphatic monocarboxylic acid ester compound, methylpentanediol diester compound), polyalkylene glycol, At least one kind of combined base oils such as polyvinyl ether, polyphenyl ether, alkylphenyl ether, and silicone oil can be used in combination as appropriate.

Examples of the mineral oil include solvent refined mineral oil, hydrorefined mineral oil, and wax isomerized oil. Usually, the kinematic viscosity at 100 ° C. is 1.0 to 25 mm ² / s, preferably 2.0 to 20.0 mm ^2. Those in the range of / s are used.

Examples of the poly-α-olefin include α-olefins having 2 to 16 carbon atoms (for example, ethylene, propylene, 1-butene, 1-hexene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, etc. ) And a copolymer having a kinematic viscosity at 100 ° C. of 1.0 to 25 mm ² / s and a viscosity index of 100 or more, particularly a kinematic viscosity at 100 ° C. of 1.5 to 20 Those having a viscosity index of 120 mm or more at 0.0 mm ² / s are preferable.

Examples of polybutene include those obtained by polymerizing isobutylene and those obtained by copolymerizing isobutylene with normal butylene, and generally include a wide range of those having a kinematic viscosity at 100 ° C. of 2.0 to 40 mm ² / s.

Examples of the alkyl benzene include monoalkyl benzene, dialkyl benzene, trialkyl benzene, and tetraalkyl benzene having a molecular weight of 200 to 450, which are substituted with a linear or branched alkyl group having 1 to 40 carbon atoms.

Examples of the alkyl naphthalene include monoalkyl naphthalene and dialkyl naphthalene substituted with a linear or branched alkyl group having 1 to 30 carbon atoms.

Examples of animal and vegetable oils include beef tallow, lard, palm oil, coconut oil, rapeseed oil, castor oil, sunflower oil and the like.

Examples of organic acid esters include fatty acid monoesters (excluding aliphatic monocarboxylic acid ester compounds according to the present invention), aliphatic dibasic acid diesters, polyol esters (excluding methylpentanediol diester compounds according to the present invention), and other Examples are esters.

As the fatty acid monoester (excluding the aliphatic monocarboxylic acid ester compound according to the present invention), an aliphatic linear or branched monocarboxylic acid having 5 to 22 carbon atoms and a linear chain having 3 to 22 carbon atoms or Examples include esters with branched saturated or unsaturated aliphatic alcohols.

Aliphatic dibasic acid diesters include oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, 1,9-nonamethylenedicarboxylic acid, 1,10-deca And a diester of an aliphatic dibasic acid such as methylenedicarboxylic acid or an anhydride thereof and a linear or branched saturated or unsaturated aliphatic alcohol having 3 to 22 carbon atoms.

Examples of polyol esters include neopentyl glycol, 2,2-diethylpropanediol, 2-butyl-2-ethylpropandiol, trimethylolethane, trimethylolpropane, pentaerythritol, ditrimethylolpropane, dipentaerythritol and the like. Polyol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,7-heptanediol, 1,8-octanediol, 1,9-nonane Diol, 1,10-decanediol, 1,2-propanediol, 2-methyl-1,3-propanediol, 1,3-butanediol, 2-methyl-1,4-butanediol, 1,4-pentane Diol, 2-methyl-1,5-pentanedioe 1,5-hexanediol, 2-methyl-1,6-hexanediol, 3-methyl-1,6-hexanediol, 1,6-heptanediol, 2-methyl-1,7-heptanediol, 3- Methyl-1,7-heptanediol, 4-methyl-1,7-heptanediol, 1,7-octanediol, 2-methyl-1,8-octanediol, 3-methyl-1,8-octanediol, 4 -Methyl-1,8-octanediol, 1,8-nonanediol, 2-methyl-1,9-nonanediol, 3-methyl-1,9-nonanediol, 4-methyl-1,9-nonanediol, Polyols having a non-neopentyl structure such as 5-methyl-1,9-nonanediol, 2-ethyl-1,3-hexanediol, glycerin, polyglycerin, sorbitol, etc. And it is possible to use the full esters of linear and / or branched, saturated or aliphatic monocarboxylic acids unsaturated having 3 to 22 carbon atoms.

Other esters include polymerized fatty acids such as dimer acid and hydrogenated dimer acid, or hydroxy fatty acids such as condensed castor oil fatty acid and hydrogenated condensed castor oil fatty acid, and linear or branched chain having 3 to 22 carbon atoms. And esters with saturated or unsaturated fatty alcohols.

Examples of the polyalkylene glycol include a ring-opening polymer of alcohol and a linear or branched alkylene oxide having 2 to 4 carbon atoms. Examples of the alkylene oxide include ethylene oxide, propylene oxide, and butylene oxide. A polymer using one of these or a copolymer using a mixture of two or more can be used. A compound in which one or both hydroxyl groups are etherified or esterified can also be used. The kinematic viscosity of the polymer is 5.0 to 1,000 mm ² / s (40 ° C.), preferably 5.0 to 500 mm ² / s (40 ° C.).

Polyvinyl ether is a compound obtained by polymerization of vinyl ether monomers, and monomers include methyl vinyl ether, ethyl vinyl ether, isopropyl vinyl ether, n-butyl vinyl ether, isobutyl vinyl ether, sec-butyl vinyl ether, tert-butyl vinyl ether, n-pentyl vinyl ether. N-hexyl vinyl ether, 2-methoxyethyl vinyl ether, 2-ethoxyethyl vinyl ether, and the like. The kinematic viscosity of the polymer is 5.0 to 1,000 mm ² / s (40 ° C.), preferably 5.0 to 500 mm ² / s (40 ° C.).

Examples of polyphenyl ether include compounds having a structure in which meta positions of two or more aromatic rings are connected by an ether bond or a thioether bond. Specifically, bis (m-phenoxyphenyl) ether, m-bis ( m-phenoxyphenoxy) benzene, and thioethers (commonly referred to as C-ether) in which one or more of these oxygens are substituted with sulfur.

Examples of the alkyl phenyl ether include compounds in which polyphenyl ether is substituted with a linear or branched alkyl group having 6 to 18 carbon atoms, and alkyl diphenyl ether substituted with one or more alkyl groups is particularly preferable.

Examples of the silicone oil include dimethyl silicone and methylphenyl silicone, and modified silicones such as long-chain alkyl silicone and fluorosilicone.

The content of the combined base oil in the lubricating base oil for fluid bearings of the present invention is recommended to be less than 10% by weight, but in order to improve the balance of physical properties, the content is preferably less than 5% by weight. preferable.

<Lubricating oil composition for fluid bearings>
In order to improve the performance of the above-described fluid base oil for a fluid bearing, the lubricant composition for a fluid bearing according to the present invention includes a lubricant base oil (that is, only an aliphatic monocarboxylic acid ester compound and a methylpentanediol diester compound). In addition to a lubricating base oil composed of an aliphatic monocarboxylic acid ester compound, a methylpentanediol diester compound, and a combined base oil).

Examples of the antioxidant include a phenolic antioxidant, an amine antioxidant, and a sulfur antioxidant. Of these, phenolic antioxidants and amine antioxidants are recommended.

As the phenolic antioxidant, a known one used in this field can be used without any particular limitation. Among these phenolic antioxidants, those having 6 to 100 carbon atoms, preferably 10 to 80 carbon atoms that do not contain sulfur in the molecule are particularly preferable.

Specifically, 2,6-di-t-butylphenol, 2,6-di-t-butyl-p-cresol, 4,4′-methylenebis (2,6-di-t-butylphenol), 4,4 '-Butylidenebis (3-methyl-6-t-butylphenol), 2,2'-methylenebis (4-ethyl-6-t-butylphenol), 2,2'-methylenebis (4-methyl-6-t-butylphenol) 4,4′-isopropylidenebisphenol, 2,4-dimethyl-6-tert-butylphenol, tetrakis [methylene-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate] methane, 1, 1,3-tris (2-methyl-4-hydroxy-5-tert-butylphenyl) butane, 1,3,5-trimethyl-2,4,6-tris (3,5-di-t- Til-4-hydroxybenzyl) benzene, 2,2′-dihydroxy-3,3′-di (α-methylcyclohexyl) -5,5′-dimethyl-diphenylmethane, 2,2′-isobutylidenebis (4 6-dimethylphenol), 2,6-bis (2′-hydroxy-3′-t-butyl-5′-methylbenzyl) -4-methylphenol, 1,1′-bis (4-hydroxyphenyl) cyclohexane, 2,5-di-t-amylhydroquinone, 2,5-di-t-butylhydroquinone, 1,4-dihydroxyanthraquinone, 3-t-butyl-4-hydroxyanisole, 2-t-butyl-4-hydroxyanisole 2,4-dibenzoylresorcinol, 4-t-butylcatechol, 2,6-di-t-butyl-4-ethylphenol, 2-hydro Xyl-4-methoxybenzophenone, 2,4-dihydroxybenzophenone, 2,2′-dihydroxy-4-methoxybenzophenone, 2,4,5-trihydroxybenzophenone, α-tocopherol, bis [2- (2-hydroxy-5 -Methyl-3-t-butylbenzyl) -4-methyl-6-t-butylphenyl] terephthalate, triethylene glycol-bis [3- (3-t-butyl-5-methyl-4-hydroxyphenylpropionate] 1,6-hexanediol-bis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate] etc. Among them, in particular, 2,6-di-t-butylphenol 2,6-di-t-butyl-p-cresol, 4,4′-methylenebis (2,6-di-t-butylphenol) 4,4′-butylidenebis (3-methyl-6-tert-butylphenol), 2,2′-methylenebis (4-ethyl-6-tert-butylphenol), 2,2′-methylenebis (4-methyl) -6-tert-butylphenol), 4,4'-isopropylidenebisphenol, 2,4-dimethyl-6-tert-butylphenol, tetrakis [methylene-3- (3,5-di-tert-butyl-4-hydroxyphenyl) ) Propionate] methane, 1,1,3-tris (2-methyl-4-hydroxy-5-tert-butylphenyl) butane, 1,3,5-trimethyl-2,4,6-tris (3,5- Di-t-butyl-4-hydroxybenzyl) benzene, 2,6-di-t-butyl-4-ethylphenol, bis [2- (2-hydroxy-5-methyl-3-tert-butyl) Tilbenzyl) -4-methyl-6-t-butylphenyl] terephthalate, triethylene glycol-bis [3- (3-t-butyl-5-methyl-4-hydroxyphenylpropionate], 1,6-hexanediol- Bis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate] is preferable, and 2,6-di-t-butyl-p-cresol, 4,4′-methylenebis (2 , 6-di-t-butylphenol) and 2,6-di-t-butyl-4-ethylphenol are most preferred.

The phenolic antioxidants may be used alone or in combination of two or more, and the amount added is usually 0.01 to 5% by weight based on the lubricating base oil for fluid bearings. It is preferably 0.1 to 2% by weight.

As the amine-based antioxidant, a known one used in this field can be used without any particular limitation. Among these amine-based antioxidants, those having 6 to 60 carbon atoms that do not contain sulfur in the molecule, and more preferably those having 10 to 40 carbon atoms are recommended.

Specifically, diphenylamine, monobutyl (including linear and branched) diphenylamine, monopentyl (including linear and branched) diphenylamine, monohexyl (including linear and branched) diphenylamine, monoheptyl (linear and branched) A monoalkyldiphenylamine such as diphenylamine, including mono-chain (including straight chain and branched) diphenylamine, particularly mono (C ₄ -C ₉ alkyl) diphenylamine (ie, one of the two benzene rings of diphenylamine is an alkyl group) In particular monosubstituted by C ₄ -C ₉ alkyl groups, ie monoalkyl-substituted diphenylamine), p, p′-dibutyl (including straight and branched) diphenylamine, p, p′-dipentyl Diphenylamine (including linear and branched), p, '-Dihexyl (including linear and branched) diphenylamine, p, p'-diheptyl (including linear and branched) diphenylamine, p, p'-dioctyl (including linear and branched) diphenylamine, p, p'dinonyl (including linear and branched) di such diphenylamine (alkylphenyl) amine, especially p, p'-di _(C 4 -C ₉ alkylphenyl) amine (i.e., two benzene rings of diphenylamine each an alkyl group, in particular C ₄ -C ₉ diphenylamine dialkyl substitution with an alkyl group is mono-substituted, those two alkyl groups are identical), di (mono-C ₄ -C ₉ alkylphenyl) an amine, which alkyl groups on one benzene ring is different from the alkyl group on the other benzene ring, di (-C ₄ -C ₉ alkyl Diphenylamines such as at least one of the four alkyl groups on the two benzene rings differing from the remaining alkyl groups; N-phenyl-1-naphthylamine, N-phenyl-2-naphthylamine Naphthylamines such as 4-octylphenyl-1-naphthylamine and 4-octylphenyl-2-naphthylamine; p-phenylenediamine, N-phenyl-N′-isopropyl-p-phenylenediamine, N-phenyl-N ′-( Examples thereof include phenylenediamines such as 1,3-dimethylbutyl) -p-phenylenediamine. Among these, p, p′-dioctyl (including linear and branched) diphenylamine, p, p′-dinonyl (including linear and branched) diphenylamine, and N-phenyl-1-naphthylamine are particularly preferable. In the present specification and claims, “(including straight chain and branched chain)” includes one or both of straight chain alkyl and branched chain alkyl.

The amine antioxidant is used alone or in combination of two or more, and the amount added is usually 0.01 to 5% by weight, preferably 0 based on the lubricating base oil for fluid bearings. .1 to 2% by weight.

A phenolic antioxidant and an amine antioxidant can be used individually by 1 type or in combination of 2 or more types, respectively. The ratio of the two is not particularly limited and can be appropriately selected from a wide range, but the weight ratio of the phenolic antioxidant (I) to the amine antioxidant (II) is (I) :( II) = 1: 0. It is preferable to use together so that it may become 0.05 to 20, especially 1: 0.2 to 5.

Preferred combinations include 2,6-di-t-butyl-p-cresol, 4,4′-methylenebis (2,6-di-t-butylphenol) and 2,6-di-t-butyl-4-ethyl. One or more selected from the group consisting of phenol, p, p′-dioctyl (including linear and branched) diphenylamine, p, p′-dinonyl (including linear and branched) diphenylamine, and Examples thereof include a combination of one or more selected from the group consisting of N-phenyl-1-naphthylamine.

Specifically, the following combinations are preferable. 2,6-di-t-butyl-p-cresol and p, p′-dioctyl (including straight and branched) diphenylamine, 2,6-di-t-butyl-p-cresol and p, p '-Dinonyl (including straight and branched) diphenylamine, 2,6-di-t-butyl-p-cresol and N-phenyl-1-naphthylamine, 4,4'-methylenebis (2,6 -Di-t-butylphenol) and p, p'-dioctyl (including linear and branched) diphenylamine, 4,4'-methylenebis (2,6-di-t-butylphenol) and p, p'- Combination of dinonyl (including linear and branched) diphenylamine, 4,4′-methylenebis (2,6-di-tert-butylphenol) and N-phenyl-1-naphthyla 2,6-di-t-butyl-4-ethylphenol and p, p'-dioctyl (including straight and branched) diphenylamine, 2,6-di-t-butyl-4- Examples include combinations of ethylphenol and p, p′-dinonyl (including straight and branched chains) diphenylamine, combinations of 2,6-di-t-butyl-4-ethylphenol and N-phenyl-1-naphthylamine, and the like. The Among them, 4,4′-methylenebis (2,6-di-t-butylphenol) and p, p′-dioctyl (including straight chain and branched chain) diphenylamine are more effective combinations in terms of excellent heat resistance. 4,4′-methylenebis (2,6-di-t-butylphenol) and p, p′-dinonyl (including straight and branched) diphenylamine, 4,4′-methylenebis (2,6 -Di-t-butylphenol) and N-phenyl-1-naphthylamine are recommended.

The amount of the phenolic antioxidant combined with the amine antioxidant is usually 0.01 to 5% by weight, preferably 0.1 to 2% by weight based on the lubricating base oil for fluid bearings. %.

In order to further improve the performance of the above lubricating oil composition for fluid bearings, metal detergent, ashless dispersant, oiliness agent, antiwear agent, extreme pressure agent, metal deactivator, rust inhibitor, viscosity index improver In addition, at least one additive such as a pour point depressant, an antifoaming agent, and a hydrolysis inhibitor can be appropriately blended. Although these compounding quantities are not specifically limited as long as there exists an effect of this invention, The specific example is shown below.

 Metal detergents include Ca-petroleum sulfonate, overbased Ca-petroleum sulfonate, Ca-alkyl benzene sulfonate, overbased Ca-alkyl benzene sulfonate, Ba-alkyl benzene sulfonate, over-based Ba-alkyl benzene sulfonate. Phonate, Mg-alkylbenzenesulfonate, overbased Mg-alkylbenzenesulfonate, Na-alkylbenzenesulfonate, overbased Na-alkylbenzenesulfonate, Ca-alkylnaphthalenesulfonate, overbased Ca- Metal sulfonates such as alkyl naphthalene sulfonates, Ca-phenates, overbased Ca-phenates, Ba-phenates, overbased Ba-phenates and other metal phenates, Ca-salicylate, overbased Ca- Metal salicylates such as resylate, Ca-phosphonates, overbased Ca-phosphonates, Ba-phosphonates, overbased Ba-phosphonates and other metal phosphonates, overbased Ca-carboxylates, etc. Can be used. When used, these metal detergents are usually added in an amount of about 1 to 10% by weight, preferably about 2 to 7% by weight, based on the lubricating base oil for fluid bearings.

Examples of the ashless dispersant include polyalkenyl succinimide, polyalkenyl succinamide, polyalkenyl benzylamine, polyalkenyl succinate and the like. These ashless dispersants may be used alone or in combination, and when used, they are usually added in an amount of 1 to 10% by weight, preferably 2 to 7% by weight, based on the lubricating base oil for fluid bearings. It is desirable to do.

Examples of oily agents include aliphatic saturated and unsaturated monocarboxylic acids such as stearic acid and oleic acid, polymerized fatty acids such as dimer acid and hydrogenated dimer acid, hydroxy fatty acids such as ricinoleic acid and 12-hydroxystearic acid, lauryl alcohol, Aliphatic saturated and unsaturated monoalcohols such as oleyl alcohol, aliphatic saturated and unsaturated monoamines such as stearylamine and oleylamine, aliphatic saturated and unsaturated monocarboxylic amides such as lauric acid amide, oleic acid amide, batyl alcohol, Glycerol ethers such as chimyl alcohol and ceralkyl alcohol, alkyl or alkenyl polyglyceryl ethers such as lauryl polyglyceryl ether and oleyl polyglyceryl ether, di (2-ethylhexyl) monoethanolamine , Poly (alkylene oxide) alkyl or alkenyl amines such as diisotridecyl monoethanolamine adduct and the like. These oil-based agents may be used alone or in combination, and when used, they are usually 0.01 wt% to 5 wt%, preferably 0.1 wt% with respect to the lubricating base oil for fluid bearings. It is desirable to add from 3% to 3% by weight.

Antiwear / extreme pressure agents include tricresyl phosphate, cresyl diphenyl phosphate, alkylphenyl phosphates, phosphate esters such as tributyl phosphate, dibutyl phosphate, tributyl phosphate, dibutyl phosphate, triisopropyl phosphate, etc. Phosphorous esters of these and their amine salts such as phosphorus, sulfurized fats and oils, sulfurized fatty acids such as sulfurized oleic acid, sulfur such as dibenzyl disulfide, sulfurized olefin, dialkyl disulfide, Zn-dialkyldithiophosphate, Zn- Examples thereof include organometallic compounds such as dialkyldithiophosphate, Mo-dialkyldithiophosphate, and Mo-dialkyldithiocarbamate. These antiwear agents may be used alone or in combination, and when used, they are usually 0.01 to 10% by weight, preferably 0.1 to 0.1% with respect to the lubricating base oil for fluid bearings. It is desirable to add 5% by weight.

Examples of the metal deactivator include benzotriazole-based, thiadiazole-based, and gallic acid ester-based compounds. These metal deactivators may be used alone or in combination, and when used, they are usually 0.01 to 0.4% by weight, preferably 0, based on the lubricating base oil for fluid bearings. It is desirable to add 0.01 to 0.2% by weight.

Antirust agents include alkyl or alkenyl succinic acid derivatives such as dodecenyl succinic acid half ester, octadecenyl succinic anhydride, dodecenyl succinic acid amide, sorbitan monooleate, glycerin monooleate, pentaerythritol monooleate Partial alcohol ester, Ca-petroleum sulfonate, Ca-alkyl benzene sulfonate, Ba-alkyl benzene sulfonate, Mg-alkyl benzene sulfonate, Na-alkyl benzene sulfonate, Zn-alkyl benzene sulfonate, Ca-alkyl naphthalene sulphate Examples thereof include metal sulfonates such as phonates, amines such as rosinamine and N-oleylsarcosine, dialkyl phosphiteamine salts, and the like. These rust inhibitors may be used alone or in combination, and when used, they are usually 0.01 to 5% by weight, preferably 0.05 to 5%, based on the lubricating base oil for fluid bearings. It is desirable to add 2% by weight.

Examples of the viscosity index improver include olefin copolymers such as polyalkyl methacrylate, polyalkyl styrene, polybutene, ethylene-propylene copolymer, styrene-diene copolymer, and styrene-maleic anhydride ester copolymer. . These viscosity index improvers may be used alone or in combination, and when used, they are usually 0.1 to 15% by weight, preferably 0.5 to the lubricating base oil for fluid bearings. It is desirable to add ~ 7% by weight.

Examples of the pour point depressant include a condensate of chlorinated paraffin and alkylnaphthalene, a condensate of chlorinated paraffin and phenol, polyalkyl methacrylate, polyalkylstyrene, polybutene and the like as the viscosity index improvers described above. These pour point depressants may be used alone or in combination, and when used, they are generally 0.01 to 5% by weight, preferably 0.1%, based on the lubricating base oil for fluid bearings. It is desirable to add ~ 3% by weight.

As the antifoaming agent, liquid silicone is suitable, and when it is used, the amount added is usually 0.0005 to 0.01% by weight based on the lubricating base oil for fluid bearings.

Hydrolysis inhibitors include alkyl glycidyl ethers, alkyl glycidyl esters, alkylene glycol glycidyl ethers, cycloaliphatic epoxies, epoxy compounds such as phenyl glycidyl ether, di-tert-butylcarbodiimide, 1,3-di- A carbodiimide compound such as p-tolylcarbodiimide can be used, and it is usually desirable to add 0.05 to 2% by weight to the lubricating base oil for fluid bearings.

EXAMPLES The present invention will be described in detail below with reference to examples, but the present invention is not limited to these examples. Further, the physical properties and chemical properties of the lubricating base oil and lubricating oil composition in each example were evaluated by the following methods.

(A) Acid value It measured based on JIS-K-2501 (1992). The detection limit is 0.01 KOHmg / g.

(B) Kinematic viscosity Kinematic viscosity at 40 ° C and 100 ° C was measured according to JIS-K-2283 (2000). However, the 0 ° C. kinematic viscosity was calculated from the viscosity-temperature relationship defined in JIS-K-2283 (2000).
When the kinematic viscosity at 40 ° C. is in the range of 5 to 15 mm ² / s, it is evaluated as good in terms of lubrication performance and energy saving.

(C) Viscosity index It calculated based on JIS-K-2283 (2000). When the viscosity index is 140 or more, it is evaluated that the viscosity-temperature characteristics are excellent.

(D) Low temperature fluidity test (pour point)
The pour point was measured according to JIS-K-2269 (1987). When the pour point is −10 ° C. or lower, it is evaluated that the low temperature fluidity is excellent.

(E) Hydrolysis stability test As a hydrolysis test, 10 g of lubricating base oil or lubricating oil composition and 1.2 g of ion-exchanged water were weighed into a test tube, and the test tube was sealed while degassing under reduced pressure. The sealed test tube was allowed to stand in a fine oven at 165 ° C. for 24 hours, and then the test solution was taken out from the test tube. The test liquid was allowed to stand, the oil layer was taken out by separation, and the acid value of the oil layer was measured. As an index of hydrolysis stability, the increase in acid value before and after the hydrolysis test was calculated. It is evaluated that the hydrolysis stability is excellent when the acid value increase is 0.70 KOHmg / g or less.

[Production Example 1]
A 1-liter four-necked flask equipped with a stirrer, a thermometer, and a water fraction receiver with a condenser tube was charged with 1.40 mol of 2-hexyldecanol (SASOL product: ISOFOL 16) and 1.47 mol of n-nonanoic acid ( OXEA product: pelargonic acid), xylene (5% by weight with respect to the total amount of raw materials) and tin oxide catalyst (0.025% by weight with respect to the total amount of raw materials) as a catalyst, and after nitrogen substitution, gradually increase to 220 ° C The temperature rose. The esterification reaction is carried out while adjusting the degree of pressure reduction so that reflux occurs while removing the produced water distilled off with the water fraction receiver with the theoretically produced water amount (25.2 g) as the target. The reaction was carried out until water distilled off. After completion of the reaction, xylene and the remaining raw material linear aliphatic saturated monocarboxylic acid were removed by distillation to obtain an esterified crude product. Subsequently, after neutralizing with 1.2 equivalent of caustic soda aqueous solution with respect to the acid value of the obtained esterified crude product, it was repeatedly washed with water until the washing water became neutral. Furthermore, after the obtained esterified crude product was subjected to adsorption treatment with activated carbon, the activated carbon was removed by filtration to obtain n-nonanoic acid (2-hexyldecyl). The acid value was less than 0.01 KOH mg / g. Hereinafter, the obtained n-nonanoic acid (2-hexyldecyl) is abbreviated as “nC9 acid / C16a”.

[Production Example 2]
N-nonane having an acid value of less than 0.01 KOH mg / g was prepared in the same manner as in Production Example 1 except that 1.40 mol of 2-octyldodecanol (product of SASOL: ISOFOL 20) was used instead of 2-hexyldecanol. The acid (2-octyldodecyl) was obtained. Hereinafter, the obtained n-nonanoic acid (2-octyldodecyl) is abbreviated as “nC9 acid / C20a”.

[Production Example 3]
Instead of 2-hexyldecanol, 1.40 mol of 2-butyloctanol (product of SASOL: ISOFOL 12) and 1.47 mol of n-decanoic acid (product of Shin Nippon Chemical Co., Ltd .: capric acid) are used instead of n-nonanoic acid. Except that, n-decanoic acid (2-butyloctyl) having an acid value of less than 0.01 KOH mg / g was obtained in the same manner as in Production Example 1. Hereinafter, the obtained n-decanoic acid (2-butyloctyl) is abbreviated as “nC10 acid / C12a”.

[Production Example 4]
n having an acid value of less than 0.01 KOHmg / g was produced in the same manner as in Production Example 1 except that 1.47 mol of n-decanoic acid (manufactured by Shin Nippon Chemical Co., Ltd .: capric acid) was used instead of n-nonanoic acid. -Decanoic acid (2-hexyldecyl) was obtained. Hereinafter, the obtained n-decanoic acid (2-hexyldecyl) is abbreviated as “nC10 acid / C16a”.

[Production Example 5]
An acid value of less than 0.01 KOHmg / g was obtained in the same manner as in Production Example 1 except that 1.47 mol of n-dodecanoic acid (Shin Nippon Rika Co., Ltd. product: lauric acid P) was used instead of n-nonanoic acid. n-dodecanoic acid (2-hexyldecyl) was obtained. Hereinafter, the obtained n-dodecanoic acid (2-hexyldecyl) is abbreviated as “nC12 acid / C16a”.

[Production Example 6]
In a 1 liter four-necked flask equipped with a stirrer, a thermometer, and a water fraction receiver with a condenser tube, 3.06 mol of n-octanoic acid (Shin Nippon Rika Co., Ltd. product: caprylic acid), 3-methyl-1, 5-pentanediol (Kuraray product: MPD) 1.50 mol, xylene (5% by weight based on the total amount of raw materials) and tin oxide (0.1% by weight based on the total amount of raw materials) as a catalyst were charged and the atmosphere was replaced with nitrogen. Thereafter, the temperature was gradually raised to 220 ° C. The esterification reaction is carried out while adjusting the degree of vacuum so that reflux occurs while removing the produced water distilled off with the moisture fraction receiver with the theoretical amount of water (54.0 g) as the target. The reaction was carried out until water distilled off. After completion of the reaction, xylene and the remaining raw material aliphatic monocarboxylic acid were removed by distillation to obtain a crude esterified product. Subsequently, after neutralizing with 1.2 equivalent of caustic soda aqueous solution with respect to the acid value of the obtained esterified crude product, it was repeatedly washed with water until the washing water became neutral. Furthermore, after the obtained esterified crude product was subjected to adsorption treatment with activated carbon, the activated carbon was removed by filtration, and 3-methyl-1,5-pentanediol-di (n--) having an acid value of less than 0.01 KOH mg / g. Octanoate) was obtained. Hereinafter, 3-methyl-1,5-pentanediol-di (n-octanoate) obtained is abbreviated as “MPD / nC8 acid”.

[Production Example 7]
3-methyl having an acid value of less than 0.01 KOH mg / g was prepared in the same manner as in Production Example 7 except that 3.06 mol of n-nonanoic acid (product of OXEA: pelargonic acid) was used instead of n-octanoic acid. -1,5-pentanediol-di (n-nonanoate) was obtained. Hereinafter, 3-methyl-1,5-pentanediol-di (n-nonanoate) obtained is abbreviated as “MPD / nC9 acid”.

[Production Example 8]
3 An acid value of less than 0.01 KOHmg / g was obtained in the same manner as in Production Example 7 except that 3.06 mol of n-decanoic acid (manufactured by Shin Nippon Chemical Co., Ltd .: capric acid) was used instead of n-octanoic acid. -Methyl-1,5-pentanediol-di (n-decanoate) was obtained. Hereinafter, 3-methyl-1,5-pentanediol-di (n-decanoate) obtained is abbreviated as “MPD / nC10 acid”.

[Production Example 9]
3 An acid value of less than 0.01 KOHmg / g was obtained in the same manner as in Production Example 7, except that 3.06 mol of n-undecanoic acid (product of Tokyo Chemical Industry: undecanoic acid) was used instead of n-octanoic acid. -Methyl-1,5-pentanediol-di (n-undecanoate) was obtained. Hereinafter, 3-methyl-1,5-pentanediol-di (n-undecanoate) obtained is abbreviated as “MPD / nC11 acid”.

[Examples 1 to 12]
The aliphatic saturated monocarboxylic acid ester compound and methylpentanediol ester compound obtained in the above Production Examples 1 to 9 are mixed so as to have the mixing ratio shown in Table 1, and the lubricating base oil for fluid bearings of the present invention Was prepared. Measurement of kinematic viscosity and viscosity index of each prepared base oil, low temperature fluidity test (pour point) and hydrolysis stability test were conducted, and the results are shown in Table 1.

[Comparative Examples 1 to 9]
The aliphatic saturated monocarboxylic acid ester compound or methylpentanediol ester compound prepared in the above Production Examples 1 to 9 was independently evaluated as a lubricant base oil for fluid bearings. The kinematic viscosity and viscosity index of these base oils, low temperature fluidity test (pour point) and hydrolysis stability test were conducted, and the results are shown in Table 1.

[Examples 13 to 16]
As shown in Table 2, 1 part by weight of an antioxidant (product of BASF: IRGANOX L57 (diphenylamine derivative)) is added to 100 parts by weight of the lubricating base oil for fluid bearings of the present invention. A lubricating oil composition was prepared. Measurements of kinematic viscosity and viscosity index of each of the prepared lubricating oil compositions, low temperature fluidity test (pour point) and hydrolysis stability test were performed, and the results are shown in Table 2.

[Comparative Examples 10 to 11]
As described in Table 2, an antioxidant was added to the aliphatic saturated monocarboxylic acid ester compound or methylpentanediol ester compound to evaluate as a lubricating oil composition for fluid bearings. Measurements of kinematic viscosity and viscosity index of these lubricating oil compositions, low temperature fluidity test (pour point) and hydrolysis stability test were conducted, and the results are shown in Table 2.

From Table 1, when compared with the case where the lubricant base oil for fluid bearings of the present invention and the esters prepared in Production Examples 1 to 9 are used alone, the lubricant base oil is excellent in hydrolysis resistance and has a viscosity index. It can be seen that this is an excellent lubricating base oil having a high low temperature fluidity. Table 2 also shows that the lubricating oil composition for hydrodynamic bearings of the present invention is also an excellent lubricating oil composition having excellent hydrolysis resistance, a high viscosity index, and good low-temperature fluidity.

The lubricant base oil for fluid bearings of the present invention is excellent in hydrolysis resistance, has a high viscosity index, and has good low-temperature fluidity. Can be used stably for a long period of time.

Claims (9)

General formula (1)
[Wherein, R ¹ represents a residue obtained by removing a carboxyl group from a linear aliphatic saturated monocarboxylic acid having 7 to 17 carbon atoms. n and m are the same or different and each represents an integer of 2 to 12. ]
One or more of aliphatic saturated monocarboxylic acid ester compounds represented by:
General formula (2)
[Wherein, R ² and R ³ are the same or different and each represents a residue obtained by removing a carboxyl group from a linear aliphatic saturated monocarboxylic acid having 7 to 11 carbon atoms. ]
1 or 2 or more types of methylpentanediol diester compounds represented by the formula (1), wherein the weight ratio of the aliphatic saturated monocarboxylic acid ester compound to the methylpentanediol diester compound is 30:70 to 80:20. Lubricating base oil for fluid bearings. The lubricating base oil for fluid bearings according to claim 1, wherein a difference between n and m described in the general formula (1) is two. The lubricating base oil for fluid bearings according to claim 1 or 2, wherein the aliphatic saturated monocarboxylic acid ester compound has a total carbon number of 26 to 40. The lubricating base oil for fluid bearings according to any one of claims 1 to 3, wherein n in the general formula (1) is an integer of 7 to 11. The R ¹ described in the general formula (1) is a residue obtained by removing a carboxyl group from a linear aliphatic saturated monocarboxylic acid having 7 to 13 carbon atoms. Lubricating base oil for fluid bearings. The lubricating oil for fluid bearings according to any one of claims 1 to 5, wherein the total of the aliphatic saturated monocarboxylic acid ester compound and the methylpentanediol diester compound in the lubricating base oil for fluid bearings is 90% by weight or more. Base oil. The lubricant base oil for fluid bearings according to any one of claims 1 to 6, wherein the lubricant base oil for fluid bearings is a lubricant base oil for hydrodynamic bearings or a lubricant base oil for sintered oil-impregnated bearings. . A lubricating oil composition for a hydrodynamic bearing, comprising the lubricating base oil for a hydrodynamic bearing according to any one of claims 1 to 7 and an antioxidant. The lubricating oil composition for fluid bearings according to claim 8, wherein the antioxidant is a phenol-based antioxidant and / or an amine-based antioxidant.