JP2001192691A - Oiling agent composition for fine amount oiling agent supply type cutting or grinding processing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oiling agent composition suitable for fine amount oiling agent supply type cutting or grinding processing in which a fine amount of an oiling agent is supplied to a cutting or grinding site together with air, especially to provide the oiling agent composition having low stickiness. SOLUTION: This oiling agent composition for fine amount oiling agent supply type cutting or grinding processing, containing an ester as a base agent and at least one antioxidant selected from ascorbic acid, ascorbic acid fatty acid esters, tocophenol, 2,6-di-t-butyl-p-cresol, 2,6-di-t-butyl-4-hydroxyanisole, 2-t-butyl-4-hydroxyanisole, 1,2-dihydro-6-ethoxy-2,2,4-trimethylquinoline, 2-(1,1- dimethyl)-1,4-benzenediol and 2,4,5-trihydroxybutylphenone. The content of the antioxidant is >=0.01 wt.% based on the total amount of the composition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil supply composition for cutting / grinding, which is suitable for cutting / grinding of a very small amount of oil supply system for supplying a very small amount of oil to a cutting / grinding point together with a compressed fluid. About things.

[0002]

2. Description of the Related Art Generally, in cutting and grinding,
Grinding oil is used. The purpose of the present invention is to improve the productivity in machining such as extending the life of tools such as drills, end mills, cutting tools, and grindstones, improving the surface roughness of a workpiece, and thereby increasing the machining efficiency. Cutting / grinding oils include water-soluble cutting / grinding oils which are used by diluting a surfactant and a lubricating component with water, and water-insoluble cutting / grinding oils which are used as raw liquids with mineral oil as a main component. Broadly classified into types. In conventional cutting / grinding, a relatively large amount of cutting / grinding oil is supplied to the processing location. The most basic and important functions of cutting and grinding fluids include lubrication and cooling. In general,
Water-insoluble cutting and grinding fluids have excellent lubrication performance, and water-soluble cutting and grinding fluids have excellent cooling performance. The cooling effect of a water-insoluble oil is inferior to that of a water-soluble oil.
A large amount of water-insoluble cutting / grinding oil is required from several liters to several tens of liters per minute.

[0003] Cutting and grinding oils that are effective for improving the machining efficiency are also unfavorable from another point of view, and a typical problem is an influence on the environment. Water-insoluble,
Regardless of water solubility, the oil gradually degrades during use and eventually becomes unusable. For example, in the case of a water-soluble oil, the stability of the liquid is reduced due to the generation of microorganisms, and the components are separated. Further, in the case of a water-insoluble oil agent, an acidic component generated by the progress of oxidation corrodes a metal material or causes a remarkable change in viscosity, making it impossible to use it. In addition, the oil agent adheres to the chips or the like and is consumed, thereby causing waste. In such a case, the deteriorated oil agent is discarded and a new oil agent is used. At this time, various treatments are required for the oil agent discharged as waste so as not to affect the environment. For example, cutting and grinding fluids that have been developed with a priority on improving work efficiency include many chlorine-based compounds that can generate toxic dioxins during incineration. Processing is required. For this reason, cutting and grinding fluids that do not contain chlorine-based compounds have been developed.However, even if such cutting and grinding fluids do not contain such harmful components, there is a problem that they affect the environment due to the large amount of waste. is there. In addition, in the case of a water-soluble oil agent, since there is a possibility of contaminating an environmental water area, it is necessary to perform advanced treatment at a high cost.

[0004]

In order to cope with the above-described problems, studies have recently been made to substitute a cutting / grinding oil agent by blowing cold air to the cutting / grinding portion to cool the portion. In this case, the lubricity required for the cutting / grinding oil cannot be obtained. In order to compensate for this point, a system has been developed in which a very small amount of oil, usually about 1 / 10,000 to 1 / 100,000, is supplied to a cutting / grinding site together with a compressed fluid (for example, compressed air).
In this system, the cooling effect by compressed air is obtained,
In addition, since a very small amount of oil is used, the amount of waste can be reduced, and therefore, the effect on the environment due to the large amount of waste can be improved. However, the performance required for the cutting / grinding process using this micro oil supply system, that is, it is possible to obtain a work with a good surface even with a very small amount, and there is little wear of tools etc. Cutting / grinding oils having high performance for efficient grinding have not been proposed yet, and their development is desired. Especially in the trace oil supply system, oil is supplied as oil mist,
There is a problem that it easily adheres to the inside of a machine tool, a work, a tool, a mist collector, and the like. In this case, if the adhered oil agent is easily sticky, it will cause a problem in handling property and cause a reduction in work efficiency. For this reason,
It is desirable that the oil agent is not sticky.

Accordingly, the present invention has been made in view of such circumstances, and it is an object of the present invention to supply an oil agent together with a compressed fluid to a cutting / grinding portion to minimize the amount of the oil agent to be used and to reduce waste. It is an object of the present invention to provide a cutting / grinding oil supply system which greatly reduces the amount of oil discharged as a cutting / grinding oil supply system, that is, an oil supply composition for cutting / grinding processing which is suitable for a very small amount of oil supply. In particular, an object of the present invention is to provide an oil agent composition that is less sticky (low stickiness).

[0006]

As a result of the study of the present inventors, an oil agent using an ester as a base oil of an oil agent composition for cutting / grinding supply with a trace amount of oil agent and further containing an antioxidant, It has been found that it is very effective in workability during cutting and grinding, the finished condition of a workpiece, and the like.
In particular, they have found that an oil agent that is less sticky can be obtained by adding an antioxidant.

[0007] The present invention relates to an oil composition for cutting / grinding, which comprises an ester as a base oil and contains an antioxidant.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to an oil composition for cutting / grinding using a trace amount of oil using an ester as a base oil. This refers to cutting / grinding that is performed while supplying a very small amount of oil (about 1 / 10,000 to 1 / 100,000) to the cutting / grinding location together with the compressed fluid as compared with cutting / grinding. In other words, the very small amount of oil supply system usually cuts a small amount of oil at a maximum of 1 ml / min or less together with a compressed fluid (for example, compressed air).
This is a method of supplying the material to the grinding location. In addition, it is also possible to use a compressed fluid such as nitrogen, argon, helium, carbon dioxide, and water alone or to mix these fluids in addition to the compressed air. The pressure of the compressed fluid in the minute amount oil supply type cutting / grinding process of the present invention is such a pressure that the oil agent does not scatter and contaminate the atmosphere, and the mixed fluid of the oil agent and gas or liquid is applied to the cutting / grinding point. The pressure is adjusted so that it can be reached sufficiently. The temperature of the compressed fluid is usually adjusted from room temperature (about 25 ° C.) or from room temperature to −50 ° C. from the viewpoint of cooling properties.

The ester used as a base oil in the oil composition for cutting / grinding (hereinafter simply referred to as oil composition or oil) of the present invention will be described. The ester as the base oil may be a natural product (usually contained in natural fats and oils such as animals and plants) or a synthetic product. In the present invention, a synthetic ester is preferable from the viewpoint of the stability of the obtained oil agent composition and the uniformity of the ester component.

As the alcohol constituting the ester,
A monohydric alcohol or a polyhydric alcohol may be used, and the acid may be a monobasic acid or a polybasic acid. The monohydric alcohol usually has 1 to 24 carbon atoms, preferably 1 to 1 carbon atoms.
2, and more preferably 1 to 8 alcohols are used. Such alcohols may be linear or branched, and may be saturated or unsaturated. As the 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, straight or branched heptanol, straight or branched octanol, straight or branched nonanol, straight or branched decanol, straight 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 hepta Decanol, linear or branched octadecanol, linear or branched nonadecanol, linear or branched icosanol, linear or branched henicosanol, linear or branched tricosanol,
Examples thereof include linear or branched tetracosanols and mixtures thereof.

The polyhydric alcohol is usually 2 to 10
Valent, preferably those having 2 to 6 valences are used. 2-10
Specific examples of the polyhydric alcohol include ethylene glycol, diethylene glycol, polyethylene glycol (3 to 15 mer of ethylene glycol), propylene glycol, dipropylene glycol, and polypropylene glycol (3 to 15 mer of propylene glycol). , 1,3-propanediol, 1,2-propanediol, 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-pentanediol, dihydric alcohols such as neopentyl glycol; glycerin, polyglycerin (glycerin dimer to octamer) For example, diglycerin,
Triglycerin, tetraglycerin, etc.), trimethylolalkanes (trimethylolethane, trimethylolpropane, trimethylolbutane, etc.) and their 2-8
Dimer, pentaerythritol and dimer and tetramer thereof,
1,2,4-butanetriol, 1,3,5-pentanetriol, 1,2,6-hexanetriol, 1,
2,3,4-butanetrol, sorbitol, sorbitan, sorbitol glycerin condensate, adonitol,
Polyhydric alcohols such as arabitol, xylitol, mannitol; sugars such as xylose, arabinose, ribose, rhamnose, glucose, fructose, galactose, mannose, sorbose, cellobiose, maltose, isomaltose, trehalose, sucrose, and mixtures thereof; Can be

Among them, ethylene glycol, diethylene glycol, polyethylene glycol (3 to 10 mer of ethylene glycol), propylene glycol, dipropylene glycol, polypropylene glycol (3 to 10 mer of propylene glycol),
1,3-propanediol, 2-methyl-1,2-propanediol, 2-methyl-1,3-propanediol, neopentyl glycol, glycerin, diglycerin, triglycerin, trimethylolalkane (trimethylolethane, trimethylolethane) Methylolpropane, trimethylolbutane, etc.) and dimers and tetramers thereof, pentaerythritol, dipentaerythritol, 1,2,4-butanetriol, 1,3,5-pentanetriol,
2,6-hexanetriol, 1,2,3,4-butane tetrol, sorbitol, sorbitan, sorbitol glycerin condensate, 2- to 6-valent polyhydric alcohols such as adonitol, arabitol, xylitol, mannitol and mixtures thereof Is preferred. Even more preferably, ethylene glycol, propylene glycol, neopentyl glycol, glycerin, trimethylolethane, trimethylolpropane, pentaerythritol,
Sorbitan, and mixtures thereof.

The alcohol constituting the ester may be a monohydric alcohol or a polyhydric alcohol, as described above, but it provides better lubricity in cutting and grinding, and provides a finished surface of the work. Improved precision and greater wear resistance of the tool edge, easier to obtain low pour point, better handling in winter and cold areas, and ester that contributes to lower stickiness It is preferably a polyhydric alcohol from the viewpoint of facilitation and the like.

As the monobasic acid, a fatty acid having 2 to 24 carbon atoms is usually used, and the fatty acid may be linear or branched, and may be saturated or unsaturated. Specifically, for example, acetic acid, propionic acid, linear or branched butanoic acid, linear or branched pentanoic acid, linear or branched hexanoic acid, linear or branched heptane 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 hydroxyoctadecanoic acid, linear or branched nonadecanoic acid Linear or branched icosanoic acid, linear or branched henicosanoic acid, linear or branched docosanoic acid, linear or branched tricosanoic acid, linear or branched tetracosanoic acid Such as saturated fatty acids, acrylic acid, linear or branched butenoic acid, linear or branched pentenoic acid, linear or branched hexenoic acid, linear or branched heptenoic acid, linear Or branched oct 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 hydroxyoctadecenoic acid, linear or branched nonadecenoic acid, linear or branched icosenic acid, linear or branched henicosenoic acid, linear or branched Docosenoic acid, linear or branched trichosenoic acid,
Unsaturated fatty acids such as linear or branched tetracosenoic acid,
And mixtures thereof. Among these,
Excellent lubrication in cutting and grinding,
In particular, the number of carbon atoms is 3 because the finished surface accuracy of the workpiece can be improved and the effect of preventing wear of the tool edge can be increased.
Preferred are saturated fatty acids having -20 to 20, saturated fatty acids having 3 to 22 carbon atoms and mixtures thereof, and more preferred are saturated fatty acids having 4 to 18 carbon atoms, unsaturated fatty acids having 4 to 18 carbon atoms and mixtures thereof.

Examples of the polybasic acid include dibasic acids having 2 to 16 carbon atoms and trimellitic acid. The dibasic acid having 2 to 16 carbon atoms may be linear or branched, and may be saturated or unsaturated. Specifically, for example, ethanedioic acid, propanedioic acid, linear or branched butanedioic acid, linear or branched pentanedioic acid,
Linear or branched hexanedioic acid, linear or branched heptanedioic acid, linear or branched octanedioic acid, linear or branched nonanedioic acid, linear or branched Decandioic acid, linear or branched undecandioic acid, linear or branched dodecandioic acid, linear or branched tridecandioic acid, linear or branched tetradecandioic acid, Chain or branched heptadecandioic acid, straight or branched hexadecandioic acid, straight or branched hexenedioic acid, straight or branched heptenedioic acid, straight or branched Octenedioic acid, linear or branched nonenedioic acid, linear or branched decenedioic acid, linear or branched undecenedioic acid, linear or branched dodecenedioic acid, linear -Or branched tridecene diacid, linear or branched tetradecene diacid, linear or Heptadecenoic diacid 岐状, such as linear or branched hexadecene diacids and mixtures thereof. The acid constituting the ester may be a monobasic acid or a polybasic acid as described above, but the one having a high viscosity index is more easily obtained and the mist property is better, and the excellent lubricating performance It is preferable to use a monobasic acid from the viewpoint that an ester contributing to a reduction in stickiness is easily obtained.

The combination of an alcohol and an acid forming an ester is arbitrary and not particularly limited. Examples of the ester usable in the present invention include the following esters. Ester of monohydric alcohol and monobasic acid Ester of polyhydric alcohol and monobasic acid Ester of monohydric alcohol and polybasic acid Ester of polyhydric alcohol and polybasic acid Mixture of monohydric alcohol and polyhydric alcohol Mixed ester of polyhydric alcohol and monobasic acid, mixture of polybasic acid Mixed ester of monohydric alcohol, mixture of polyhydric alcohol and monobasic acid, polybasic acid

Among them, a material having a low pour point, which provides more excellent lubricity in cutting and grinding, improves the finished surface accuracy of the workpiece and increases the effect of preventing wear of the tool edge, and is more easily obtained. Polyvalent from the viewpoint that the handleability in winter and cold regions is more improved, that having a higher viscosity index is easier to obtain, the mist property is better, and that the ester that contributes to lower stickiness is more easily obtained. It is preferably an ester of an alcohol and a monobasic acid.

The natural fats and oils that can be used are not particularly limited, but preferably, for example, palm oil, palm kernel oil,
Vegetable oils such as rapeseed oil, soybean oil, high oleic rapeseed oil, and high oleic sunflower oil, and animal oils such as lard can be mentioned.

In the present invention, the ester obtained when a polyhydric alcohol is used as the alcohol component may be a complete ester in which all of the hydroxyl groups in the polyhydric alcohol are esterified, or a part of the hydroxyl groups is not esterified. A partial ester remaining as a hydroxyl group may be used. Further, the organic acid ester obtained when a polybasic acid is used as the acid component may be a complete ester in which all of the carboxyl groups in the polybasic acid are esterified, or a part of the carboxyl group is not esterified and the carboxyl group is not esterified. A partial ester which remains as a group may be used.

By using the above ester as the base oil in the oil agent composition of the present invention, an oil agent having improved lubricating properties can be obtained. However, in order to obtain an oil agent exhibiting better lubricating performance, a hydroxyl value of 0.1 is required. It is preferred to use from 01 to 300 mg KOH / g ester. In order for the oil agent of the present invention to have higher lubricity, the upper limit of the hydroxyl value of the ester is more preferably 200 mgKOH / g, and most preferably 150 mgKOH / g, while the lower limit is more preferably. Is 0.1 mgKOH / g, more preferably 0.5 mgKOH / g, more preferably 1 mgKOH / g, and still more preferably 3 mgKOH / g.
OH / g, most preferably 5 mg KOH / g. Here, the hydroxyl value of the ester is determined according to JIS K 00
70 means a value measured by an indicator titration method of "Method for measuring acid value, saponification value, ester value, iodine value, hydroxyl value and unsaponified value of chemical product".

The hydroxyl value is 0.01 to 300 mgKOH /
The method for preparing the ester in the range of g is not particularly limited, and examples thereof include a method of selecting the raw materials and adjusting the reaction conditions in the ester preparation step, and a method of mixing two or more esters. . When an ester having a desired hydroxyl value is prepared by mixing two or more esters having different hydroxyl values, an ester having a relatively low hydroxyl value and an ester having a relatively high hydroxyl value are used in combination. Specifically, a hydroxyl value of 0 to 150 mg KOH
/ g, more preferably 0-100 mgKOH / g, more preferably 0-50 mgKOH / g, and most preferably 0-0
20 mg KOH / g of ester, and a hydroxyl value of more than 150 and 500 mg KOH / g or less, more preferably 200 to
400 mg KOH / g, most preferably 250-350
It is preferable to use in combination with an ester of mgKOH / g. Regarding the blending amount, the former ester is used in an amount of 50 to 99.9% by mass, more preferably 70 to 99.5% by mass, and most preferably 80 to 99.9% by mass based on the total amount of the ester.
To 99% by mass, and the latter ester may be used in an amount of 0.1 to 50% by mass, more preferably 0.5 to 30% by mass, and most preferably 1 to 20% by mass, based on the total amount of the ester. preferable. When the oil composition is constituted as a mixture of two or more kinds of esters, an ester having a relatively low hydroxyl value usually serves as a base oil of the oil composition, and an ester having a relatively high hydroxyl value serves as an additive. However, in the present invention, these are collectively treated as a base oil.

The saponification value of the ester is preferably in the range of 100 to 500 mgKOH / g from the viewpoint of further improving the lubricity of the oil agent. The upper limit of the saponification value of the ester is more preferably 400 mg KOH / g, while the lower limit is more preferably 200 mg KOH / g. Here, the saponification value of the ester is based on JIS K 25
03 means the value measured by the indicator titration method of “Aerospace Lubricating Oil Test Method”.

It is preferable that the oil composition having good lubricating properties is further less sticky, and for this purpose, an ester having an iodine value of 0 to 80 and / or a bromine value of 0 to 80 is preferred.
It is preferable to use the ester in the range of 50gBr ₂ / 100g. The iodine value of the ester is more preferably 0.
-60, more preferably 0-40, more preferably 0-20, most preferably 0-10. The bromine value of the ester is more preferably 0-3.
0 gBr2 / 100 g, more preferably 0 to ₂₀ g
Range of Br ₂ / 100g, most preferably 0~10gBr
It is in the range of ₂ / 100g. Here, the iodine value of the ester is a value measured by an indicator titration method of JIS K 0070 "Method for measuring acid value, saponification value, ester value, iodine value, hydroxyl value and unsaponifiable value of chemical products". means. The bromine value of the ester is determined according to JIS K 2605.
It means the value measured by "Chemical product-Bromine value test method-Electro titration method".

The kinematic viscosity of the ester is not particularly limited, but the upper limit of the kinematic viscosity at 40 ° C. is preferably 200 mm ² / s, and more preferably 100 mm ^2, from the viewpoint of easy supply to the processing site. ² / s, more preferably 75 mm ² / s, most preferably 50 mm ² / s.
mm ² / s. On the other hand, the lower limit is preferably 1 mm ² / s, more preferably 3 mm ² / s, and most preferably 5 mm ² / s. The pour point and viscosity index of the ester are not particularly limited, but the pour point is preferably −20 ° C. or lower, more preferably −20 ° C.
45 ° C. or less. The viscosity index is desirably 100 or more and 200 or less.

The content of the ester used as the base oil in the oil agent composition of the present invention is not particularly limited. However, from the viewpoint of biodegradability in which the oil component is easily decomposed by microorganisms such as bacteria and the surrounding environment is maintained, the content of the ester in the oil agent is 1 based on the total amount of the composition.
The content is preferably 0% by mass or more, more preferably 20% by mass or more, still more preferably 30% by mass or more, and most preferably 50% by mass or more.

The oil agent composition of the present invention contains an antioxidant in addition to the above ester as a base oil. Oxidation stability of the oil agent is ensured by adding the antioxidant, and stickiness can be suppressed. Antioxidants that can be used include those used for lubricants or as food additives, for example, 2,6-di-tert.
-Butyl-p-cresol (DBPC), 4,4′-methylenebis (2,6-di-tert-butylphenol),
4,4'-bis (2,6-di-tert-butylphenol), 4,4'-thiobis (6-tert-butyl-o-cresol), ascorbic acid (vitamin C), fatty acid ester of ascorbic acid, tocopherol (Vitamin E), 3,5-di-tert-butyl-4-hydroxyanisole, 2-tert-butyl-4-hydroxyanisole, 3-tert-butyl-4-hydroxyanisole,
1,2-dihydro-6-ethoxy-2,2,4-trimethylquinoline (ethoxyquin), 2- (1,1-dimethyl) -1,4-benzenediol (TBHQ), 2,
4,5-trihydroxybutyrophenone (THBP) can be mentioned.

Among them, ascorbic acid (vitamin C), fatty acid ester of ascorbic acid, tocopherol (vitamin E), 2,6-di-tert-butyl-p-
Cresol (DBPC), 3,5-di-tert-butyl-
4-hydroxyanisole, 2-tert-butyl-4-hydroxyanisole, 3-tert-butyl-4-hydroxyanisole, 1,2-dihydro-6-ethoxy-
2,2,4-trimethylquinoline (ethoxyquin), 2
-(1,1-dimethyl) -1,4-benzenediol (TBHQ) or 2,4,5-trihydroxybutyrophenone (THBP) is preferred, and more preferably, ascorbic acid (vitamin C) or a fatty acid of ascorbic acid Ester, tocopherol (vitamin E), 2,6-di-tert-butyl-p-cresol (DBPC), or 3,5-di-tert-butyl-4-hydroxyanisole. The content of the antioxidant is not particularly limited, but the content of the antioxidant in the oil agent is preferably 0.01% by mass or more based on the total amount of the composition in order to maintain good oxidation stability. , More preferably 0.05% by mass or more,
Most preferably, it is 0.1% by mass or more. The upper limit of the content is preferably 10% by mass or less, more preferably 5% by mass or less, and most preferably 3% by mass or less, since the effect cannot be expected to increase even if it is added more.

The oil composition of the present invention contains an ester and an antioxidant as a base oil.
Conventionally known base oils and additives other than the above oil agents can be contained as grinding oil. The base oil may be a mineral oil or a synthetic oil (excluding esters). As a mineral oil, for example, a lubricating oil fraction obtained by atmospheric distillation and vacuum distillation of crude oil is subjected to solvent removal, solvent extraction, hydrocracking, solvent dewaxing, catalytic dewaxing, hydrorefining, and sulfuric acid washing. And paraffinic and naphthenic oils that are purified by appropriately combining purification treatments such as clay treatment. Examples of the synthetic oil include poly-α-olefins (polybutene,
-Octene oligomer, 1-decene oligomer, etc.), alkylbenzene, alkylnaphthalene, polyoxyalkylene glycol, polyphenylether and the like can be used. The amount of these base oils is not particularly limited, but is preferably 90% by mass or less, more preferably 70% by mass or less, based on the total amount of the composition.
It is particularly preferred that the content is 0% by mass or less. In the present invention,
From the viewpoint of biodegradability, it is preferable that the base oil is composed of only the ester component (100% by mass).

Conventionally known additives include, for example, chlorine-based, sulfur-based, phosphorus-based, and organometallic-based extreme pressure additives; wetting agents such as diethylene glycol monoalkyl ether; acrylic polymers, paraffin wax, microwax, and slack. Film forming agents such as waxes and polyolefin waxes; water displacing agents such as fatty acid amine salts; solid lubricants such as graphite, fluorinated graphite, molybdenum disulfide, boron nitride, polyethylene powder; amines, alkanolamines;
Corrosion inhibitors such as amide, carboxylic acid, carboxylate, sulfonate, phosphoric acid and phosphate; benzotriazole,
Metal deactivators such as thiadiazole; antifoaming agents such as methyl silicone, fluorosilicone, and polyacrylate; ashless dispersants such as alkenyl succinimide, benzylamine, and polyalkenylamine aminoamide. The content of these known additives in combination is not particularly limited, but is added in such an amount that the total content of these known additives is 0.1 to 10% by mass based on the total amount of the composition. It is common to do.

The kinematic viscosity of the oil composition of the present invention is not particularly limited, but the upper limit of the kinematic viscosity at 40 ° C. is 200 mm ² / s from the viewpoint of easy supply to the processing site.
And more preferably 100 mm ² /
s, more preferably 75 mm ² / s, and most preferably 50 mm ² / s. On the other hand, the lower limit is preferably 1 mm ² / s, more preferably 3 mm ² / s, and most preferably 5 mm ² / s.

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 16 and Reference Example 1 Various oil compositions shown in Table 1 below using an ester α (natural oil or fat) or ester a (synthesis) as a base oil and an antioxidant. Was prepared. The stickiness was evaluated. Table 1 shows the evaluation results. The ester α as the base oil
An oil agent consisting only of (natural oils and fats) was similarly evaluated, and the evaluation results are shown in Table 1.

[Evaluation of stickiness] Aluminum plate (100 mm
5 ml of the oil agent composition was placed on the same and placed in a constant temperature bath at 70 ° C. for one month, and the degree of stickiness of the oil agent composition-attached portion was evaluated by finger touch in five stages. The mass average molecular weight before and after the test was measured by GPC, and the rate of change was determined. The five-grade evaluation of stickiness is as follows. A: There is no stickiness at all. B: No or no stickiness at all. C: There is slight stickiness. D: There is stickiness. E: Very sticky.

[0034]

[Table 1]

From the results shown in Table 1, the oil agent compositions containing an antioxidant in an ester as a base oil (Examples 1 to 18)
It can be seen that is less sticky than the oil composition comprising only the ester as the base oil of Reference Example 1.

[0036]

[Effect of the Invention] An oil agent composition suitable for cutting / grinding processing of a very small amount of oil agent supply system in which a trace amount of oil agent composition is supplied together with air to a cutting / grinding point by further containing an antioxidant with an ester as a base oil. Things can be provided. Since the oxidation stability of the oil composition is secured by the addition of the antioxidant, the oil composition is less sticky. Further, when an ester having a specific hydroxyl value is used as the base oil, the lubricity is improved, and when an ester having a specific iodine value and / or bromine value is used, the stickiness is further reduced. Can be.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) C10M 129/20 C10M 129/20 129/24 129/24 129/74 129/74 133/38 133/38 / / C10N 20:00 C10N 20:00 Z 30:10 30:10 40:22 40:22 50:04 50:04 (72) Inventor Yoshitaka Natsume 1 Nishiishicho, Kashiwazaki-shi, Niigata Japan Oil Processing Kashiwazaki Plant (72) Inventor Masanori Ibi 1 Nishiishi-cho, Kashiwazaki-shi, Niigata Nippon Oil Processing Co., Ltd.Kashiwazaki Plant (72) Inventor Minoru Okajima 2--10-10 Takanawa, Minato-ku, Tokyo Nippon Oil Processing Co., Ltd. 72) Inventor Ichiro Inazaki 3-47-3 Kamoi, Yokosuka City, Kanagawa Prefecture 8 Chidoricho, Ward Formula company lubricant part lubricating oil Institute in the F-term (reference) 4H104 BB05C BB06C BB08C BB10C BB12C BB32A BB33A BB34A BB34C BB36A BE26C EA22A EB09 LA05 PA22 QA09

Claims (8)

[Claims] 1. An oil agent composition for cutting / grinding, which comprises an ester as a base oil and contains an antioxidant. 2. An antioxidant comprising ascorbic acid (vitamin C), a fatty acid ester of ascorbic acid, tocopherol (vitamin E), 2,6-di-tert-butyl-p-
Cresol (DBPC), 3,5-di-tert-butyl-
4-hydroxyanisole, 2-tert-butyl-4-hydroxyanisole, 3-tert-butyl-4-hydroxyanisole, 1,2-dihydro-6-ethoxy-
2,2,4-trimethylquinoline (ethoxyquin), 2
The compound according to claim 1, which is at least one compound selected from the group consisting of-(1,1-dimethyl) -1,4-benzenediol (TBHQ) and 2,4,5-trihydroxybutyrophenone (THBP). Composition. 3. An antioxidant comprising ascorbic acid (vitamin C), a fatty acid ester of ascorbic acid, tocopherol (vitamin E), 2,6-di-tert-butyl-p-
The composition according to claim 1, which is at least one compound selected from the group consisting of cresol (DBPC) and 3,5-di-tert-butyl-4-hydroxyanisole. 4. An ester having a hydroxyl value of 0.01 to 300.
The composition according to any one of claims 1 to 3, wherein the composition is mgKOH / g. 5. The saponification value of the ester is from 100 to 500 m.
The composition according to any one of claims 1 to 4, wherein the composition is gKOH / g. 6. The composition according to claim 1, wherein the ester has an iodine value of 0 to 80. 7. esters bromine number of 0~50gBr _2/1
The composition according to any one of claims 1 to 6, which is 00 g. 8. The method according to claim 1, wherein the ester is a synthetic ester.
8. The composition according to any one of items 1 to 7.