JP2001192686A - 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 an improved lubrication performance. SOLUTION: This oiling agent composition for fine amount oiling agent supply type cutting or grinding processing, containing an ester having a hydroxyl group value of 0.01 to 300 mgKOH/g.

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 and is consumed and becomes 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. In addition, in the trace oil supply system, the 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 composition having excellent lubricity so that cutting and grinding can be performed efficiently.

[0006]

As a result of the research of the present inventors, the workability during cutting and grinding is improved by using an oil containing an ester as the oil composition for cutting and grinding with a trace amount of oil. It has been found that it is very effective in finishing the workpiece. It has been found that it is effective to use an ester having a hydroxyl value of 0.01 to 300 mgKOH / g in order to exhibit particularly excellent lubricating performance and perform efficient cutting and grinding. Furthermore, it has been found that when such an ester has a specific iodine value and / or bromine value, an oil agent which is less sticky can be obtained.

According to the present invention, the hydroxyl value is 0.01 to 300 m.
It is an oil agent composition for cutting / grinding which supplies a trace amount of oil agent containing gKOH / g ester. Here, the hydroxyl 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.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to an oil composition for cutting / grinding which supplies an extremely small amount of oil, which contains an ester. -This refers to cutting / grinding that is performed while supplying a very small amount of oil, about 1 / 10,000 to 1 / 100,000, together with the compressed fluid to the cutting / grinding location compared to grinding. That is, the trace amount oil supply method is a method of supplying a small amount of oil, usually at most 1 ml / min or less, together with a compressed fluid (for example, compressed air) toward a cutting / grinding portion. 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 room temperature (about 25 ° C.) from the viewpoint of cooling properties.
Alternatively, the temperature is adjusted from room temperature to −50 ° C.

The oil composition for cutting / grinding (hereinafter simply referred to as oil composition or oil) of the present invention comprises an ester having a hydroxyl value of 0.01 to 300 mgKOH / g. However, the ester 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 of the present invention may be a monohydric alcohol or a polyhydric alcohol as described above. Ester that improves the finishing surface accuracy and the effect of preventing wear of the tool edge is greater, the one with a low pour point is easier to obtain, the handleability in winter and cold regions is more improved, and the ester that further contributes to the reduction of stickiness It is preferable to use a polyhydric alcohol from the viewpoint of easily obtaining

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 of the present invention may be a monobasic acid or a polybasic acid as described above. A monobasic acid is preferred from the viewpoint that an ester contributing to improved lubrication performance and further contributing to a reduction in stickiness is easily obtained.

The combination of the alcohol and the acid forming the ester of the present invention is optional 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.

The use of an ester as the oil agent composition of the present invention provides an oil agent having improved lubricity, but the use of an ester having a hydroxyl value of 0.01 to 300 mgKOH / g provides an oil agent exhibiting better lubricating performance. Can be obtained. 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 preferably 2
00 mg KOH / g, more preferably 150 mg KOH / g.
KOH / g, while its lower limit is preferably 0.
1 mgKOH / g, more preferably 0.5 mgK
OH / g, more preferably 1 mg KOH / g, more preferably 3 mg KOH / g, and most preferably 5 mg KOH / g.

The hydroxyl value is 0.01 to 300 mgKOH /
The method for preparing the ester in the range of g is not particularly limited. For example, a method of adjusting the selection of raw materials and reaction conditions in the ester preparation step, or a method of mixing two or more esters having different hydroxyl values is used. Can be mentioned. When two or more esters having different hydroxyl values are mixed to prepare an ester having a desired hydroxyl value, an ester having a relatively low hydroxyl value and an ester having a relatively high hydroxyl value are used in combination. Specifically, the hydroxyl value is 0
~ 150mgKOH / g, more preferably 0 ~ 100m
gKOH / g, more preferably 0 to 50 mgKOH / g,
Most preferably from 0 to 20 mg KOH / g ester;
It is preferable to use a combination of an ester having a hydroxyl value of more than 150 and not more than 500 mgKOH / g, more preferably 200 to 400 mgKOH / g, and most preferably 250 to 350 mgKOH / g. In addition, the amount of these compounds is 50 to 9 based on the total amount of the ester.
9.9% by mass, more preferably 70 to 99.5% by mass,
Most preferably 80 to 99% by mass, and the latter ester in an amount of 0.1 to 50% by mass, more preferably 0.5 to 30% by mass, most preferably 1 to 20% by mass based on the total amount of the ester. It is preferred to use. 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 of the present invention is not particularly limited, but is preferably 4 from the viewpoint of easy supply to the processing site.
The upper limit of the kinematic viscosity at 0 ° C. is preferably 200 mm ² / s, 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 1m
m ² / s, more preferably 3 mm ² / s
/ S, and most preferably 5 mm ² / s. The pour point and viscosity index of the ester of the present invention are not particularly limited, but the pour point is preferably −20 ° C. or lower, more preferably −45 ° C. or lower. The viscosity index is desirably 100 or more and 200 or less.

The content of the ester used 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 is preferably 10% by mass or more based on the total amount of the composition.
%, More preferably at least 30% by mass, and most preferably at least 50% by mass.
That is all.

When components other than the above-mentioned ester are blended into the oil agent composition of the present invention, conventionally known base oils and additives can be used as cutting and grinding oils. 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. ,
Examples of the oil include paraffinic and naphthenic oils which are appropriately combined with a refining treatment such as a clay treatment. As the synthetic oil, for example, poly-α-olefin (polybutene, 1-octene oligomer, 1-decene oligomer and the like), alkylbenzene, alkylnaphthalene, polyoxyalkylene glycol, polyphenylether and the like can be used. The blending amount when these base oils are used is not particularly limited, but is preferably 90% by mass or less, more preferably 70% by mass or less, and more preferably 50% by mass or less based on the total amount of the composition. Is particularly preferred.
In the present invention, from the viewpoint of biodegradability, it is preferable that the base oil is composed of only the ester component having the above characteristics (100% by mass).

Conventionally known additives include, for example, 2,
6-di-tert-butyl-p-cresol, 4,4′-methylenebis (2,6-di-tert-butylphenol),
Antioxidants represented by 4,4'-bis (2,6-di-tert-butylphenol), 4,4'-thiobis (6-tert-butyl-o-cresol), etc .; oils such as fatty acids and alcohols Agents; chlorine, sulfur, phosphorus, and organometallic extreme pressure additives; wetting agents such as diethylene glycol monoalkyl ether; film-forming agents such as acrylic polymers, paraffin wax, microwax, slack wax, and polyolefin wax; Aqueous displacement agents such as amine salts; solid lubricants such as graphite, graphite fluoride, molybdenum disulfide, boron nitride, and polyethylene powder; amines;
Corrosion inhibitors such as alkanolamines, amides, carboxylic acids, carboxylate salts, sulfonates, phosphoric acids, phosphates;
Metal deactivators such as benzotriazole and thiadiazole; defoamers such as methylsilicone, fluorosilicone and polyacrylate; ashless dispersants such as alkenylsuccinimide, benzylamine and polyalkenylamineaminoamide. The content when these known additives are used in combination is not particularly limited, but the total content of these known additives is 0.1 to 10 based on the total amount of the composition.
It is generally added in such an amount as to give a mass%.

The kinematic viscosity of the oil agent 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, its lower limit is
It is preferably 1 mm ² / s, more preferably 3 mm ² / s.
mm ² / s, most preferably 5 mm ² / s.

Hereinafter, the contents 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 11 Using the following synthetic esters and / or natural fats and oils, various oil compositions shown in Table 1 below were prepared, and evaluated for lubricity and stickiness by a tapping test. went. Table 1 shows the evaluation results. In the tapping test, an example in which only air was blown without using the oil agent composition was evaluated as Comparative Example 1, and the evaluation results are shown in Table 1. (Synthetic ester) a: trimethylolpropane, nC ₆ acid, nC ₈
Of acid and a mixture of nC ₁₀ acid (mixing molar ratio 7: 5)
9:34) b: tetraester of pentaerythritol with nC ₈ acid c: trimethylolpropane with nC ₈ acid and nC
Tetraester of ₁₈ mixture of the acid (mixing molar ratio 40:60) d: diester of neopentyl glycol and oleic acid e: diesters of acid trimethylol propane and n-C ₁₀ f: pentaerythritol and oleic acid G: Monoester of glycerin and oleic acid (hydroxyl value 315 mg KOH / g, saponification value 157 mg KOH /
g, iodine value 72, bromine number 45gBr ₂ / 100g)

(Natural fats and oils) α: Commercial palm kernel oil β: Commercial lard oil γ: Commercial high oleic sunflower oil δ: Commercial rapeseed oil

[Evaluation of Lubricity (Tapping Test)] A tapping test was carried out under the following conditions by using each oil composition and a comparative standard oil (DIDA: diisodecyl adipate) alternately. The tapping energy in each case was measured, and the tapping energy efficiency (%) was calculated by the following equation. The higher the value of% tapping energy efficiency, the higher the lubricity. Tapping energy efficiency (%) = (Tapping energy when using DIDA) / (Tapping energy when using oil agent composition) Tapping conditions Tool: Nut tap M8 (P = 1.25 mm) Pilot hole diameter: φ6. 8 mm Work: S25C (t = 10 mm) Cutting speed: 9.0 m / min Oil supply system Each oil composition: compressed air 0.2 MPa, oil composition 25
Spraying at a flow rate of 4.3 mL / min without using compressed air

[Evaluation of stickiness] Aluminum plate (100 mm
× 70 mm), the oil composition was placed in a constant temperature bath at 70 ° C. for 168 hours, and the degree of stickiness of the oil solution composition-attached portion was judged by five steps. 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 hydroxyl value was 0.01 to 3
It can be seen that the oil composition containing 00 mg KOH / g ester shows high lubricating performance. In addition, iodine value 0
Oil agent composition containing 80 and esters of bromine number 0~50gBr ₂ / 100g It can be seen that also combines a low stickiness. Even when the oil agent composition was constituted as a mixture of two types of esters as in Example 11, the oil composition was 0.1%.
The oil composition adjusted to a hydroxyl value in the range of 01 to 300 mgKOH / g shows high lubricating performance.

[0036]

According to the present invention, by using an ester as a base oil, it is possible to provide an oil agent composition suitable for a cutting / grinding process of a very small amount of oil agent supply system for supplying a trace amount of oil agent composition to a cutting / grinding portion together with air. it can. Particularly, a hydroxyl value of 0.01 to
By using an ester in the range of 300 mgKOH / g, an oil composition having improved lubricating performance can be obtained. When the ester has a specific iodine value and / or bromine value, it is possible to obtain an oil composition having low stickiness and lubricity.

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Yoshitaka Natsume 1 Nishiishi-cho, Kashiwazaki-shi, Niigata Japan Oil Processing Co., Ltd. Kashiwazaki Plant (72) Inventor Masanori Ibi 1 Nishiishi-cho, Kashiwazaki-shi, Niigata Japan Oil Processing Stock (72) Inventor Minoru Okajima 2-18-10 Takanawa, Minato-ku, Tokyo Japan Oil Processing Co., Ltd. (72) Inventor Ichiro Inazaki 3-47-3 Kamoi, Yokosuka City, Kanagawa Prefecture (72) Inventor Toshiaki Wakabayashi 1239-2, Ikedo, Miki-cho, Kida-gun, Kagawa Prefecture I-Oike Todoruku C101 (72) Inventor Satoshi Suda 8th Chidori-cho, Naka-ku, Yokohama-shi, Kanagawa Nishiishi Mitsui Co., Ltd. Reference) 4H104 BB32A BB33A BB34A BB36A EA22A PA22 QA09

Claims (5)

[Claims] (1) a hydroxyl value of 0.01 to 300 mg KOH;
/ g ester containing micro trace oil supply type cutting
Oil solution composition for grinding. 2. The saponification value of the ester is 100 to 500 m.
2. The composition according to claim 1, wherein the composition is gKOH / g. 3. The composition according to claim 1, wherein the ester has an iodine value of 0 to 80. 4. esters bromine number of 0~50gBr _2/1
The composition according to any one of claims 1 to 3, which is 00 g. 5. The method according to claim 1, wherein the ester is a synthetic ester.
5. The composition according to any one of items 4 to 4.