JPH111693A - Lubricating oil composition for sliding guideway - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a lubricating oil composition for a sliding guide surface which has excellent lubricating properties on a sliding guide surface and separability from a water-soluble cutting fluid and does not adversely affect various properties of the water-soluble cutting fluid. Develop. SOLUTION: At least one kind selected from mineral oil, fat and oil and synthetic oil is used as a base oil, (A) a carboxylic acid and / or an ester, (B) a phosphate ester represented by the following formula (1), O = P- (OR ¹ ) ₃ (1)] [In the formula (1), R ¹ represents a hydrocarbon group having 1 to 24 carbon atoms. Or (C) a lubricating oil composition containing an organic acid salt of at least one metal selected from alkali metals, alkaline earth metals, zinc and lead.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating oil composition for a sliding guide surface, and more particularly to a lubricating oil composition for a sliding guide surface having excellent lubricating properties on the sliding guide surface and excellent separability from a water-soluble cutting fluid. About things.

[0002]

2. Description of the Related Art Many machine tools have a structure in which lubricating oil for a slide guide surface is mixed into a machining fluid of a workpiece. In particular, when a water-soluble cutting fluid is used as the machining fluid, the mixing of this sliding guide surface lubricant deteriorates the water-soluble cutting fluid (decreases cutting performance, accelerates rot, shortens the oil refining life, waste fluid treatment cost) Increase) is one of the causes. Therefore, the lubricating oil for the sliding guide surface has excellent lubricating properties on the sliding guide surface, and also has excellent separability from the water-soluble cutting fluid when mixed with the water-soluble cutting fluid. It is required that the performance of the water-soluble cutting fluid is not adversely affected.

[0003]

However, additives for improving the lubricating properties usually used for lubricating oils for sliding guide surfaces reduce the separability from a water-soluble cutting fluid, and the conventional lubricating properties It has been difficult to obtain a sliding guide surface lubricating oil that is excellent in both the separation properties from the water and the water-soluble cutting fluid. An object of the present invention is to provide excellent lubrication properties on a sliding guide surface, excellent separation from a water-soluble cutting fluid when mixed with a water-soluble cutting fluid, and do not adversely affect various properties of the water-soluble cutting fluid. An object of the present invention is to provide a lubricating oil composition for a sliding guide surface.

[0004]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to overcome the above-mentioned problems, and as a result, a lubricating oil composition having a specific composition has excellent lubricating properties and is separated from a water-soluble cutting fluid. The inventors have found that the present invention has excellent properties, and have completed the present invention.

[0005] That is, the first invention of the present invention comprises, as a base oil, at least one selected from mineral oils, fats and oils, and synthetic oils; (A) a carboxylic acid and / or an ester; and (B) a compound represented by the following formula (1): A phosphate ester represented by the formula: O = P- (OR ¹ ) ₃ (1) (In the above formula (1), R ¹ represents a hydrocarbon group having 1 to 24 carbon atoms.) And a lubricating oil composition for a sliding guide surface.

A second invention of the present invention provides a base oil comprising at least one selected from mineral oils, fats and oils and synthetic oils, wherein (A) a carboxylic acid and / or an ester (B) A phosphate ester represented by the formula: O = P- (OR ¹ ) ₃ (1) (in the above formula (1), R ¹ represents a hydrocarbon group having 1 to 24 carbon atoms); and (C) an alkali metal; An object of the present invention is to provide a lubricating oil composition for a sliding guide surface, comprising an organic acid salt of at least one metal selected from alkaline earth metals, zinc and lead.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail. The lubricating oil composition for a sliding guide surface of the present invention comprises at least one selected from mineral oil, fat and oil and synthetic oil as a base oil. Examples of the mineral base oil usable in the present invention include solvent removal, solvent extraction, hydrocracking, and solvent removal for lubricating oil fractions obtained by distilling crude oil under normal pressure and reduced pressure. And paraffinic or naphthenic mineral oils obtained by appropriately combining one or more purification means such as catalytic dewaxing, hydrorefining, sulfuric acid washing, and clay treatment.

The fats and oils include beef tallow, lard, soybean oil, rapeseed oil, rice bran oil, coconut oil, palm oil, palm kernel oil, and hydrogenated products thereof.

As synthetic oils, for example, poly-α-
Olefins (ethylene-propylene copolymer, polybutene, 1-octene oligomer, 1-decene oligomer,
And hydrides thereof), alkyl benzene, alkyl naphthalene, monoester (butyl stearate, octyl laurate), diester (ditridecyl glutarate, di-2-ethylhexyl adipate, diisodecyl adipate, ditridecyl adipate, di-
2-ethylhexyl sepacate, etc.), polyester (such as trimellitate), polyol ester (trimethylolpropane caprylate, trimethylolpropaneperargonate, pentaerythritol-2)
-Ethylhexanoate, pentaerythritol pelargonate, etc.), polyoxyalkylene glycol, polyphenyl ether, dialkyl diphenyl ether,
Phosphate esters (tricresyl phosphate, etc.),
Examples include fluorinated compounds (such as perfluoropolyethers and fluorinated polyolefins), silicone oils and the like.

As the base oil of the lubricating oil composition for a sliding guide surface of the present invention, the above-described base oil may be used alone,
More than one kind may be combined. The viscosity of the base oil used in the present invention is not particularly limited.
Preferably has kinematic viscosity in the range of 10 to 500 mm ² / s at ° C., it is more preferably in the range of 15~250mm ² / s. In the present invention, the content of the above base oil is arbitrary, but is usually used in the range of 50 to 99.98% by mass based on the total amount of the composition.

The component (A) of the present invention comprises a carboxylic acid (A-
1) and / or esters (A-2). (A-
1) As the carboxylic acid, one carboxyl group is contained in the molecule.
Or a polycarboxylic acid having two or more carboxyl groups in the molecule. As the monocarboxylic acid, a fatty acid having 6 to 24 carbon atoms is usually used. Further, it may be linear or branched, and may be a saturated fatty acid or an unsaturated fatty acid. As the fatty acid having 6 to 24 carbon atoms, specifically, for example, linear or branched hexanoic acid, linear or branched heptanoic acid, linear or branched octanoic acid, linear or Branched nonanoic acid, linear or branched decanoic acid, linear or branched undecanoic acid,
Linear or branched dodecanoic acid, linear or branched tridecanoic acid, linear or branched tetradecanoic acid, linear or branched pentadecanoic acid, linear or branched hexadecanoic acid, Linear or branched heptadecanoic acid, linear or branched octadecanoic acid, linear or branched nonadecanoic acid, linear or branched icosanoic acid, linear or branched hencicosanoic acid,
Saturated fatty acids such as linear or branched docosanoic acid, linear or branched tricosanoic acid, linear or branched tetracosanoic acid, or linear or branched hexenoic acid, linear or Branched heptenoic acid, linear or branched octenoic acid, linear or branched nonenic acid, linear or branched decenoic acid, linear or branched undecenoic acid, linear or Branched dodecenoic acid,
Linear or branched tridecenoic acid, linear or branched tetradecenoic acid, linear or branched pentadecenoic acid, linear or branched hexadecenoic acid, linear or branched heptadecenoic acid, Linear or branched octadecenoic acid, linear or branched nonadecenoic acid, linear or branched eicosenoic acid, linear or branched heicosenoic acid, linear or branched docosenic acid, Unsaturated fatty acids such as linear or branched tricosenoic acid and linear or branched tetracosenoic acid are exemplified.

Further, polycarboxylic acids include those having 2 carbon atoms.
Are preferably used, and specifically, for example,
Oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suvalic acid, azelaic acid, sebacic acid, methylmalonic acid, ethylmalonic acid, dimethylmalonic acid, methylsuccinic acid, 2,2-dimethylsuccinic acid, 2,
3-dimethylsuccinic acid, 2-ethyl-2-methylsuccinic acid, 2-methylglutaric acid, 3-methylglutaric acid, 3
-Saturated aliphatic dicarboxylic acids such as methyl adipic acid, unsaturated aliphatic dicarboxylic acids such as maleic acid, fumaric acid, itaconic acid, citraconic acid, and mesaconic acid; fragrances such as phthalic acid, terephthalic acid, isophthalic acid, and trimellitic acid Group polycarboxylic acids and the like.

The above (A-2) ester is an ester comprising an alcohol and / or phenol and a carboxylic acid. (A-2) The alcohol constituting the ester may be a monohydric alcohol or a dihydric or higher polyhydric alcohol. As the monohydric alcohol, an aliphatic alcohol having 1 to 24 carbon atoms is usually used. As the aliphatic alcohol having 1 to 24 carbon atoms, specifically, for example, methanol, ethanol, linear or branched propanol, linear or branched butanol, linear or branched pentanol, Linear or branched hexanol, linear or branched heptanol,
Linear or branched octanol, linear or branched nonanol, linear or branched decanol, linear or branched undecanol, linear or branched dodecanol, linear or branched Tridecanol, linear or branched tetradecanol, linear or branched pentadecanol, linear or branched hexadecanol, linear or branched heptadecanol, linear Linear or branched octadecanol, linear or branched nonadecanol, linear or branched icosenol, linear or branched henicocenol, linear or branched docosenol, linear or branched Tricocenol, linear or branched tetracocenol, and the like.

As the polyhydric alcohol, 2 to 10
Valent ones are preferably used. Specific examples of the polyhydric alcohol having 2 to 10 valences include ethylene glycol, diethylene glycol, polyethylene glycol (3 to 15 mer of ethylene glycol), propylene glycol, dipropylene glycol, and polypropylene glycol (3 to 15 propylene glycol). Monomer), 1,3-
Propanediol, 1,2-butanediol, 1,3-
Butanediol, 1,4-butanediol, 2-methyl-1,2-propanediol, 2-methyl-1,3-propanediol, 1,2-pentanediol, 1,3-
Pentanediol, 1,4-pentanediol, 1,5
-Dihydric alcohols such as pentanediol and neopentyl glycol; glycerin, polyglycerin (2- to 8-mer of glycerin such as diglycerin, triglycerin,
Tetraglycerin, etc.), trimethylolalkanes (trimethylolethane, trimethylolpropane, trimethylolbutane, etc.) and their 2- to 8-mers, pentaerythritol and their 2- to 4-mers, 1, 2, 2,
4-butanetriol, 1,3,5-pentanetriol, 1,2,6-hexanetriol, 1,2,3,4
Polyhydric alcohols such as butanetetrol, sorbitol, sorbitan, sorbitol glycerin condensate, adonitol, arabitol, xylitol, mannitol; xylose, arabinose, ribose, rhamnose, glucose, fructose, galactose, mannose, sorbose, cellobiose, maltose, and isobutyl Sugars such as maltose, trehalose and sucrose can be mentioned.

The (A-2) ester may be an ester composed of the above-mentioned alcohol, or an ester composed of a phenol compound. As the phenol compound used herein, those having 6 to 12 carbon atoms are usually used. Specifically, for example, phenol, methylphenol (also known as cresol) (including all substituted isomers), and ethylphenol (including all substituted isomers) Isomer), dimethylphenol (including all substituted isomers), propylphenol (including all substituted isomers), ethylmethylphenol (including all substituted isomers), trimethylphenol (including all substituted isomers) Isomers), butylphenol (including all substituted isomers),
Pentylphenol (including all substituted isomers), hexylphenol (including all substituted isomers) and the like can be mentioned.

As the carboxylic acid constituting the (A-2) ester, specifically, for example, the same ones as those exemplified as the (A-1) carboxylic acid can be used. In the case where a polyhydric alcohol is used as the alcohol constituting the (A-2) ester, a complete ester in which all of the hydroxyl groups are esterified may be used, and at least one of the hydroxyl groups may be a non-esterified hydroxyl group. It may be a partial ester which remains as it is, but is preferably a complete ester. In this case, only one carboxylic acid may be used, or two or more carboxylic acids may be used.

Similarly, when a polycarboxylic acid is used as the carboxylic acid constituting the ester (A-2), a complete ester in which all of the carboxyl groups are esterified may be used, and at least one of the carboxyl groups may be used. The above may be a partial ester remaining as a non-esterified carboxyl group, but is preferably a complete ester. In this case, only one kind of alcohol may be used, or two kinds of alcohols may be used.

In the present invention, the component (A) may be composed of one compound selected from the above (A-1) and (A-2), or may be a mixture of two or more compounds. It may be.

When (A-1) carboxylic acid is used as the component (A) of the present invention, the upper limit of the content of the component (A-1) is 40% by mass, preferably 20% by mass, based on the total amount of the composition. , More preferably 10% by weight, and most preferably 7% by weight. Even if the content of the component (A-1) exceeds 40% by mass, no further improvement in the effect is observed, and the storage stability may be deteriorated.

In the present invention, (A-
2) It is also possible to use an ester, in which case (A)
-2) The upper limit of the content of the ester corresponding to the ester is 99.9% by mass, preferably 90% by mass, based on the total amount of the composition.
%, More preferably 50% by weight.

The lower limit of the content of the component (A) is 0.01% by mass, preferably 0.05% by mass, more preferably 0.1% by mass, and most preferably 0.1% by mass, based on the total amount of the composition. 2% by mass. If the content of the component (A) is less than 0.01% by mass, the lubricity deteriorates, which is not preferable.

The component (B) of the present invention is a phosphite represented by the following formula (1).

O = P- (OR ¹ ) ₃ (1) (In the above formula (1), R ¹ represents a hydrocarbon group having 1 to 24 carbon atoms.)

In the above formula (1), R ¹ represents a hydrocarbon group having 1 to 24 carbon atoms.
Specifically, for example, methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, s
ec-butyl group, tert-butyl group, linear or branched pentyl group, linear or branched hexyl group, linear or branched heptyl group, linear or branched octyl group, linear or branched A nonyl group of a branch, a linear or branched decyl group,
Linear or branched undecyl group, linear or branched dodecyl group, linear or branched tridecyl group, linear or branched tetradecyl group, linear or branched pentadecyl group, linear or branched A hexadecyl group, a linear or branched heptadecyl group, a linear or branched octadecyl group,
Straight or branched nonadecyl group, straight or branched icosyl group, straight or branched henicosyl group, straight or branched docosyl group, straight or branched tricosyl group, straight or branched An alkyl group having 1 to 24 carbon atoms such as a tetracosyl group;

Vinyl, straight or branched propenyl, straight or branched butenyl, straight or branched pentenyl, straight or branched hexenyl, straight or branched heptenyl, Linear or branched octenyl group, linear or branched nonenyl group, linear or branched decenyl group, linear or branched undecenyl group, linear or branched dodecenyl group, linear or branched A tridecenyl group, a linear or branched tetradecenyl group, a linear or branched pentadecenyl group, a linear or branched hexadecenyl group, a linear or branched heptadecenyl group, a linear or branched octadecenyl group, A chain or branched nonadecenyl group, a straight or branched icosenyl group, a straight or branched henicocenyl group, a straight or branched docosenyl group,
An alkenyl group having 2 to 24 carbon atoms, such as a linear or branched tricosenyl group, a linear or branched tetracosenyl group;

A cycloalkyl group having 5 to 7 carbon atoms, such as a cyclopentyl group, a cyclohexyl group or a cycloheptyl group;
Methylcyclopentyl group, dimethylcyclopentyl group (including all structural isomers), methylethylcyclopentyl group (including all structural isomers), diethylcyclopentyl group (including all structural isomers), methylcyclohexyl group, dimethylcyclohexyl Group (including all structural isomers), methylethylcyclohexyl group (including all structural isomers), diethylcyclohexyl group (including all structural isomers), methylcycloheptyl group, dimethylcycloheptyl group (including all structural isomers) Alkylcycloalkyl groups having 6 to 11 carbon atoms, such as structural isomers), methylethylcycloheptyl group (including all structural isomers), and diethylcycloheptyl group (including all structural isomers);

6-1 carbon atoms such as phenyl and naphthyl
Aryl group 0: tolyl group (including all structural isomers), xylyl group (including all structural isomers), ethylphenyl group (including all structural isomers), linear or branched propylphenyl Groups (including all structural isomers),
Linear or branched butylphenyl groups (including all structural isomers), linear or branched pentylphenyl groups (including all structural isomers), linear or branched hexylphenyl groups (including all structural isomers) Linear or branched heptylphenyl group (including all structural isomers), linear or branched octylphenyl group (including all structural isomers), linear or branched A nonylphenyl group (including all structural isomers), a linear or branched decylphenyl group (including all structural isomers), a linear or branched undecylphenyl group (including all structural isomers) An alkylaryl group having 7 to 18 carbon atoms, such as a linear or branched dodecylphenyl group (including all structural isomers);

Benzyl, phenylethyl, phenylpropyl (including isomers of propyl), phenylbutyl (including isomers of butyl), phenylpentyl (including isomers of pentyl), phenyl An arylalkyl group having 7 to 12 carbon atoms such as a hexyl group (including isomers of a hexyl group);

R ¹ is preferably a phenyl group or an alkylaryl group having 7 to 18 carbon atoms, and more preferably a phenyl group or an alkylaryl group having 7 to 10 carbon atoms, from the viewpoint of excellent separability from a water-soluble cutting fluid. Alkylaryl groups are more preferred. R ¹ may be the same or different in the same molecule.

In the present invention, as the component (B), one kind selected from the above compounds may be used, or a mixture of two or more kinds may be used. (B)
The upper limit of the content of the component is 30% by mass, preferably 10% by mass, more preferably 5% by mass, based on the total amount of the composition.
Most preferably, it is 3% by mass. If the content of the component (B) exceeds 30% by mass, no further improvement in the effect can be seen and the cost increases, which is not preferable. The lower limit of the content of the component (B) is 0.01% by mass, preferably 0.05% by mass, more preferably 0.1% by mass, and most preferably 0.2% by mass based on the total amount of the composition. It is. If the content of the component (B) is less than 0.01% by mass, the lubricity is undesirably reduced.

In the present invention, the base oil (A)
When the component and the component (B) are contained, a sliding guide surface oil composition excellent in both lubricating properties and water-soluble cutting fluid can be obtained. In order to increase the content, it is desirable to further add, as the component (C), an organic acid salt of at least one metal selected from alkali metals, alkaline earth metals, zinc and lead.

In the component (C), specific examples of the alkali metal include sodium and potassium, and specific examples of the alkaline earth metal include magnesium, calcium and barium. In the component (C), as the organic acid salt,
Specifically, for example, (C-1) sulfonate, (C-
2) Phenates, (C-3) salicylates, and mixtures thereof.

(C-1) As the sulfonate, an alkyl aromatic sulfonic acid obtained by sulfonating an alkyl aromatic compound having a molecular weight of 100 to 1500, preferably 200 to 700, an alkali metal, an alkaline earth metal, So-called neutral sulfonates obtained by reacting zinc or lead bases (oxides or hydroxides); neutral sulfonates and excess alkali metal, alkaline earth metal, zinc or lead salts or bases (oxidized Products and hydroxides) in the presence of water.
So-called basic sulfonates; neutral sulfonates in the presence of carbon dioxide are converted to alkali metals, alkaline earth metals,
So-called carbonate overbased (ultrabasic) sulfonates obtained by reacting with zinc or lead bases (oxides or hydroxides); neutral sulfonates are converted to alkali metals, alkaline earth metals, zinc or lead. Reaction with a base (oxide or hydroxide) and a boric acid compound such as boric acid or boric anhydride, or a borate compound such as carbonate overbased (ultrabasic) sulfonate and boric acid or boric anhydride A so-called borate overbased (ultrabasic) sulfonate produced by reacting
And mixtures thereof.

Specific examples of the alkyl aromatic sulfonic acid include so-called petroleum sulfonic acid and synthetic sulfonic acid. As the petroleum sulfonic acid used herein, generally, a sulfonated alkyl aromatic compound of a lubricating oil fraction of a mineral oil, a so-called mahoganic acid which is a by-product of white oil production, and the like are used. In addition, as the synthetic sulfonic acid, for example, as a by-product from an alkylbenzene production plant used as a raw material for detergents,
A sulfonated alkylbenzene having a linear or branched alkyl group obtained by alkylating a polyolefin to benzene, or a sulfonated alkylnaphthalene such as dinonylnaphthalene is used. The sulfonating agent for sulfonating these alkyl aromatic compounds is not particularly limited, but fuming sulfuric acid or sulfuric anhydride is usually used.

Specific examples of the (C-2) phenate include, for example, an alkylphenol having 1 to 2 alkyl groups having 4 to 20 carbon atoms and an alkali metal or an alkali metal in the presence or absence of elemental sulfur. Neutral phenate obtained by reacting with an earth metal, zinc or lead base (oxide or hydroxide); salt or base of neutral phenate with excess alkali metal, alkaline earth metal, zinc or lead ( So-called basic phenates obtained by heating oxides and hydroxides in the presence of water; neutral phenates in the presence of carbon dioxide are converted to alkali metal, alkaline earth metal, zinc or lead bases (oxidation). So-called carbonate overbased (ultrabasic) phenate obtained by reacting a neutral phenate with an alkali metal or alkaline earth metal. With zinc or lead bases (oxides or hydroxides) and boric acid compounds such as boric acid or boric anhydride, or with carbonate overbased (ultrabasic) phenates and boric acid or boric anhydride And so-called borate overbased (ultra-basic) phenates produced by reacting a boric acid compound such as, for example, and a mixture thereof.

As the (C-3) salicylate, specifically, for example, an alkyl salicylic acid having 1 to 2 alkyl groups having 4 to 20 carbon atoms can be used in the presence or absence of elemental sulfur, with an alkali metal, A neutral salicylate obtained by reacting with an alkaline earth metal, zinc or lead base (oxide or hydroxide); neutral salicylate;
A so-called basic salicylate obtained by heating an excess alkali metal, alkaline earth metal, zinc or lead salt or base (oxide or hydroxide) in the presence of water;
Neutral salicylate in the presence of carbon dioxide, alkali metal,
So-called carbonate overbased (ultrabasic) salicylates obtained by reacting with alkaline earth metals, zinc or lead bases (oxides and hydroxides); neutral salicylates as alkali metals, alkaline earth metals With zinc or lead bases (oxides and hydroxides) and boric acid compounds such as boric acid or boric anhydride, or with carbonate overbased (ultrabasic) metal salicylates and boric acid or boric anhydride. So-called borate overbased (ultrabasic) produced by reacting boric acid compounds such as acids
Salicylates; and mixtures thereof.

As the component (C) of the present invention, among the above-mentioned compounds, an organic acid salt of an alkaline earth metal is preferred from the viewpoint of excellent lubricity and separability from a water-soluble cutting fluid. Overbased organic acid salts of 30-500 mg KOH / g are more preferred. In addition, the total base number mentioned here is JIS K2501 "Petroleum products and lubricating oil-neutralization test method" of 7. Means the total base number measured by the perchloric acid method in accordance with

In the present invention, as the component (C), only one compound selected from the above compounds may be used, or a mixture of two or more compounds may be used. The upper limit of the content of the component (C) is 20% by mass based on the total amount of the composition.
Preferably it is 10% by weight, more preferably 5% by weight, most preferably 3% by weight. If the content of the component (C) exceeds 20% by mass, no further improvement in the effect can be expected, and the cost may increase. Also,
When the component (C) is blended, the lower limit of the content is 0.01% by mass, preferably 0.05% by mass, more preferably 0.1% by mass, and most preferably 0.1% by mass, based on the total amount of the composition.
It is desirably 2% by mass. When the content of the component (C) is less than 0.01% by mass, the effect of improving the separation property from the water-soluble cutting fluid cannot be expected.

The lubricating oil composition for a sliding guide surface of the present invention comprises:
Furthermore, in order to enhance its excellent properties as needed, it may be used in a form in which other various additives are blended. Examples of such additives include phenol compounds such as di-tert-butyl-p-cresol and bisphenol A, phenyl-α-naphthylamine, N, N′-di (2-naphthyl) -p-phenylenediamine and the like. Antioxidants such as amine compounds; metal deactivators such as benzotriazole and alkyl thiadiazole; defoamers such as silicone oil and fluorosilicone oil; demulsifiers such as condensation products of ethylene oxide and propylene oxide; polymethacrylate Pour point depressants such as polymethacrylates, polybutenes, polyalkylstyrenes, olefin copolymers, styrene-diene copolymers, styrene-maleic anhydride copolymers, and other viscosity index improvers.

The sliding guide surface oil lubricating oil composition of the present invention comprises:
When these additives are blended, they may be used alone or in combination of two or more. The amount of addition of these known additives is arbitrary, but it is usually preferable to add an amount such that the total amount of these known additives is 15% by mass or less based on the total amount of the composition.

[0041]

EXAMPLES Hereinafter, the content of the present invention will be described more specifically with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples.

(Examples 1 to 9) Table 1 (Examples 1 to 6)
Lubricating oil compositions for sliding guide surfaces according to the present invention were prepared according to the compositions shown in Table 2 (Examples 7 to 9). With respect to these compositions, the positioning performance of a machine tool and the water-soluble cutting fluid separability were evaluated by the following methods. The results are shown in Table 1 (Examples 1 to 6) and Table 2 (Examples 7 to 9).

Comparative Examples 1 to 7 Compositions for comparison were prepared with the compositions shown in Table 3 (Comparative Examples 1 to 4) and Table 4 (Comparative Examples 5 to 7). For these compositions, the positioning performance of the machine tool and the water-soluble cutting fluid separation property were evaluated in the same manner as in Examples 1 to 9. The results are shown in Table 3 (Comparative Example 1).
4) and Table 4 (Comparative Examples 5 to 7).

The components used in the examples and comparative examples are as follows. Base oil Base 1: Highly paraffinic solvent refined mineral oil (68.0 mm ²
/ S (＠ 40 ° C.)) Group 2: 65:35 (volume ratio) mixed oil of poly α-olefin (number average molecular weight 650) and trimethylolpropane trilaurate (68.0 mm ² / s (＠ 40 ° C.) )

(A) Component A1: Oleic acid A2: Glycerin triolate

(B) Component B1: Tricresyl phosphate O = P- (OC ₆ H ₄ CH ₃ ) ₃ B2: Cresyl diphenyl phosphate B3: Xylenyl diphenyl phosphate

(C) Component C1: Overbased calcium sulfonate containing calcium carbonate (overbased calcium salt of petroleum sulfonic acid having a weight average molecular weight of 450, total base number (perchloric acid method) 160 mg KOH
/ G, calcium content 6.6% by mass) C2: overbased calcium salicylate containing calcium borate (overbased calcium of alkyl salicylic acid having an alkyl group derived from an α-olefin mixture having 12 to 20 carbon atoms) Salt, total base number (perchloric acid method) 170 mg KO
H / g, calcium content: 6.8% by mass) C3: calcium carbonate-containing overbased calcium phenate (an overbased calcium salt of an alkylphenol having an alkyl group derived from an α-olefin mixture having 9 to 18 carbon atoms) , Total base number (perchloric acid method) 125 mg KOH
/ G, calcium content 5.7% by mass) C4: overbased calcium salicylate containing calcium carbonate (overbased calcium of alkyl salicylic acid having an alkyl group derived from an α-olefin mixture having 12 to 20 carbon atoms) Salt, total base number (perchloric acid method) 160 mg KO
H / g, calcium content 6.2% by mass)

(Positioning Performance of Machine Tool) A roundness meter was installed on a processing table, and the circularity (μm) when the circular motion was performed on the XY plane was measured under the following test conditions. It is determined that the smaller this value is, the higher the positioning performance is. Test conditions Roundness measuring device: CMD (manufactured by Makino Milling) Machining center: UB-75-II (manufactured by Nissei Urawa) Measuring surface: XY plane Circular radius of motion: 200 mm Feeding speed: 300 mm / min Measurement points: 1258 point / 360deg

(Solution of Water-soluble Cutting Fluid) 30 mL of a sample oil and 70 mL of a water-soluble cutting fluid were collected in a 100-mL graduated measuring cylinder, shaken at room temperature for 1 minute, and the state of separation after a predetermined time had elapsed was observed. The following were used as the water-soluble cutting fluid. Emulsion type cutting fluid JIS K 2241 "Cutting oil" W1 class 1 equivalent, dilution ratio 10 times Soluble type cutting fluid JIS K 2241 "Cutting oil" W2 class 1 equivalent, dilution ratio 30 times Was determined as follows. Determination of Separation Conditions In observing the separation conditions, the names of the respective separation layers were determined as shown in FIG. 1, and the volume (mL) of each layer was measured.

[0050]

[Table 1]

[0051]

[Table 2]

[0052]

[Table 3]

[0053]

[Table 4]

Tables 1 and 2 show that the lubricating oil compositions for sliding guide surfaces of the present invention (Examples 1 to 6) have high positioning performance, excellent lubricating properties on the sliding guide surfaces, and when mixed with a water-soluble cutting fluid. It can be seen that it has excellent separability from water-soluble cutting fluid.
On the other hand, the compositions of Comparative Examples 1 to 7 from Tables 3 to 4 have low positioning performance and poor lubrication properties on the sliding guide surface, and when mixed with the water-soluble cutting fluid, It can be seen that the separability from the above is inferior.

[0055]

Industrial Applicability The lubricating oil composition for a sliding guide surface of the present invention has excellent lubricating properties on the sliding guide surface, and has excellent separability from a water-soluble cutting fluid when mixed with a water-soluble cutting fluid, and A lubricating oil composition for a sliding guide surface that does not adversely affect the performance of the water-soluble cutting fluid.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating names of respective separation layers in evaluation of water-soluble cutting fluid separation properties.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI C10M 129: 34 129: 42 129: 52 129: 70 129: 72 129: 74) C10N 30:00 40:00

Claims (2)

[Claims] 1. A base oil comprising at least one selected from mineral oils, fats and oils, and synthetic oils; (A) a carboxylic acid and / or an ester; and (B) a phosphate ester represented by the following formula (1): O = P- (OR ¹ ) ₃ (1) (In the formula (1), R ¹ represents a hydrocarbon group having 1 to 24 carbon atoms.) Composition. 2. A base oil comprising at least one selected from mineral oils, fats and oils and synthetic oils, wherein (A) a carboxylic acid and / or an ester (B) a phosphate ester represented by the following formula (1): = P- (OR ¹ ) ₃ (1) (In the above formula (1), R ¹ represents a hydrocarbon group having 1 to 24 carbon atoms.) And (C) an alkali metal, an alkaline earth metal, zinc and lead A lubricating oil composition for a sliding guide surface comprising at least one organic acid salt of a metal selected from the group consisting of: