JPH08253786A - Metal working oil composition - Google Patents

Abstract

PURPOSE: To obtain a metal working oil composition which has satisfactory removability, can dispense with the subsequent cleaning step in various working operations such as plastic forming, cutting, and grinding, and is especially suited for use in the working of stainless-steel materials, surface-treated steel plates, and aluminum materials. CONSTITUTION: The composition comprises a base oil having a 90% distillation temp. of 150-450 deg.C, a 6-30C linear olefin, a carboxylic acid ester of a monohydric aliphatic alcohol, and a phosphorus compound, the amounts of the olefin and the ester and that of the phosphorus compound in terms of phosphorus being 0.05-99.9wt.%, 0.01-20wt.%, and 10-1,000ppm, respectively, based on the whole composition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal working oil composition, and more specifically, it has a good degreasing property, and in a wide range of processing such as plastic working and cutting / grinding, a post-process cleaning treatment is omitted. The present invention relates to a metalworking oil composition which is capable of improving productivity as a result, and is particularly suitable for working stainless materials, surface-treated steel sheets and aluminum materials.

[0002]

2. Description of the Related Art Metal working oils such as press oils conventionally used for metal working such as plastic working, cutting, grinding, etc. have various extreme pressure agents and oil-based agents for the purpose of improving workability. Is included. On the other hand, users who use metalworking oils, from the viewpoint of labor saving in the post process and environmental problems,
There is a demand for a type of oil agent that can omit the cleaning process in the subsequent process. As a metalworking oil that meets the needs of such users, for example, an oil agent in which an α-olefin and a small amount of an oiliness agent are mixed with a base oil is commercially available. However, although this oil agent has excellent degreasing properties and is suitable for processing aluminum materials and surface-treated steel sheets, there is a problem in that it cannot be applied to the processing of stainless materials and the like in terms of lubricity. A non-volatile oil agent is usually used for the processing of stainless materials, and therefore, a cleaning treatment after the processing is performed. Therefore, there has been a demand for the development of a metal working oil that can be applied to the processing of stainless materials and that does not require a cleaning process in the subsequent process.

[0003]

Under the circumstances, the present invention can be applied not only to the processing of aluminum materials and surface-treated steel sheets but also to the processing of stainless steel materials, and also has good degreasing property and plasticity. In a wide range of processing such as processing and cutting / grinding, the cleaning process in the post process can be omitted,
As a result, it is an object of the present invention to provide a metalworking oil composition that improves productivity.

[0004]

DISCLOSURE OF THE INVENTION As a result of intensive studies to develop a metalworking oil composition having the above-mentioned preferable properties, the present inventors have found that a specific base oil having a specific distillation property has a specific distillation property. It has been found that the object can be achieved by blending a linear olefin having a carbon number, a carboxylic acid ester whose alcohol component is a monohydric aliphatic alcohol, and a phosphorus-containing compound in a predetermined ratio. The present invention
It was completed based on this knowledge. That is,
The present invention relates to (A) a base oil having a 90% distillation temperature of 150 to 450 ° C., based on the total weight of the composition, and (B) having 6 to 6 carbon atoms.
30 linear olefins in an amount of 0.05 to 99.9% by weight,
(C) 0.01 to 20% by weight of a carboxylic acid ester whose alcohol component is a monohydric alcohol and (D) a phosphorus-containing compound in a proportion of 10 to 1000 ppm as a phosphorus atom, a metalworking oil composition. It is to provide things.

In the metalworking oil composition of the present invention,
The base oil used as the component (A) needs to have a 90% distillation temperature in the range of 150 to 450 ° C. If the 90% distillation temperature is lower than 150 ° C, the flash point is low, and the handling risk is high, and the workability may be deteriorated. If the 90% distillation temperature is higher than 450 ° C, the degreasing property is poor, and the cleaning process is performed in the subsequent step. Is required. From the viewpoint of flash point, processability and degreasing property, the 90% distillation temperature is preferably in the range of 150 to 350 ° C, particularly preferably 170 to 270 ° C. The 90% distillation temperature was measured according to JIS K-225.
It is the value measured according to 4. The kinematic viscosity at 40 ° C. is preferably in the range of 0.5 to 50 cSt.
If the kinematic viscosity is less than 0.5 cSt, the flash point is low, the handling risk is high, and the workability may be deteriorated.
Not preferred. Further, if it exceeds 50 cSt, the degreasing property is poor, and a cleaning treatment in a later step may be required, which is not preferable. From the viewpoint of flash point, workability and degreasing property, the kinematic viscosity is more preferably in the range of 0.8 to 30 cSt, particularly preferably in the range of 0.8 to 10 cSt. Further, the sulfur content is preferably 500 ppm or less. This sulfur content is 500
If it exceeds ppm, stains and rust may occur on the processed product, which is not preferable. From the viewpoint of suppressing the generation of stains and rust on the processed product, the sulfur content is 100 p
It is preferably pm or less.

Mineral oil or synthetic oil can be used as the base oil having such properties. Various types of mineral oil can be used. For example, a paraffin-based crude oil, an intermediate-based crude oil, or a naphthene-based crude oil is distilled under atmospheric pressure, or a distillate obtained by distilling the residual oil of atmospheric distillation under reduced pressure, or purifying it according to a conventional method The refined oil obtained by the above method may include, for example, solvent refined oil, hydrogenated refined oil, dewaxed treated oil, and clay treated oil. The synthetic oil may be a hydrocarbon-based synthetic oil, for example, an α-olefin oligomer having 8 to 14 carbon atoms, a low molecular weight olefin copolymer (eg, ethylene-propylene copolymer), or a branched olefin such as low molecular weight polybutene or low molecular weight polypropylene. And hydrides of these and alkylbenzenes can be preferably used. In the present invention, as the base oil, only one kind selected from the above mineral oil and synthetic oil may be used, or two or more kinds may be used in combination, but in view of improving processability and oxidation stability. Therefore, it is preferable to use mineral oil.

In the metalworking oil composition of the present invention,
As the component (B), a linear olefin having 6 to 30 carbon atoms is used. A linear olefin having less than 6 carbon atoms is not suitable because it has a low flash point and a high risk of handling. If the carbon number exceeds 30, it becomes solid,
In addition to being difficult to use, it is difficult to mix and dissolve with base oil and other additives, and it is also difficult to obtain. Among the above-mentioned linear olefins, those having one double bond in the molecule are preferable, and particularly linear α-olefins having 8 to 20 carbon atoms are easy to handle, easy to obtain, base oil and others. It is preferable from the viewpoints of mixing with the additives and solubility. Specific examples of the linear olefin include 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, and the like. These may be used alone or in combination of two or more kinds. May be. As the linear olefin, those produced by various methods can be used, and for example, an ethylene oligomer obtained by polymerizing ethylene by a usual means can be used.

In the composition of the present invention, the linear olefin as the component (B) is 0.05 based on the total weight of the composition.
It is blended in a proportion of 99.9% by weight. This blended amount is 0.0
If it is less than 5% by weight, sufficient workability cannot be obtained. Also, 9
If it exceeds 9.9% by weight, the amount of other additives compounded relatively decreases, so that a metalworking oil composition having desired performance cannot be obtained. From the standpoint of performance such as processability, the preferable blending amount of the linear olefin is in the range of 1 to 50% by weight, particularly 5 to 30% by weight.

In the metalworking oil composition of the present invention,
As the component (C), a carboxylic acid ester whose alcohol component is a monohydric aliphatic alcohol is used. Examples of the acid component in this ester include monovalent carboxylic acids such as fatty acids and polyvalent carboxylic acids such as dibasic acids, and these carboxylic acids may be either saturated or unsaturated.

Examples of these carboxylic acid residues (groups excluding carboxyl groups) include monovalent hydrocarbon groups having 1 to 20 carbon atoms and polyvalent hydrocarbon groups such as divalent hydrocarbon groups. Examples of the monovalent hydrocarbon group include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, t-butyl group, amyl group, isoamyl group, various hexyl groups, various octyl groups, Various decyl groups, various dodecyl groups, various tetradecyl groups, various hexadecyl groups, various octadecyl groups and other alkyl groups having 1 to 20 carbon atoms, cyclopentyl groups, cyclohexyl groups and other cycloalkyl groups having 5 to 20 carbon atoms, propenyl groups,
C2-C20 alkenyl group such as allyl group and oleyl group, C6-C20 aryl group such as phenyl group, naphthyl group, tolyl group, xylyl group, etc., C7-C20 such as benzyl group and phenethyl group And the aralkyl group of. Examples of the polyvalent hydrocarbon group include alkylene groups having 1 to 20 carbon atoms such as methylene group, ethylene group, trimethylene group, tetramethylene group and pentamethylene group, and alkenylene groups having 2 to 20 carbon atoms such as vinylene group. And so on.

Specific examples of such a carboxylic acid include:
Acetic acid, propionic acid, butyric acid, caproic acid, caprylic acid,
Capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, acrylic acid, methacrylic acid, oleic acid, malonic acid, succinic acid, glutaric acid, adipic acid,
Examples include sebacic acid, decanedioic acid, maleic acid, fumaric acid, benzoic acid and phenylacetic acid. On the other hand, the monohydric aliphatic alcohol as the alcohol component may be either saturated or unsaturated. The monohydric aliphatic alcohol has 1 to 20 carbon atoms, such as methyl alcohol,
Ethyl alcohol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, isobutyl alcohol, sec-butyl alcohol, t-butyl alcohol, amyl alcohol, isoamyl alcohol, hexyl alcohol, octyl alcohol, nonyl alcohol, decyl alcohol, lauryl alcohol, Examples thereof include myristyl alcohol, palmityl alcohol, stearyl alcohol, cyclohexanol, allyl alcohol, and oleyl alcohol.

From the viewpoint of processability, the carboxylic acid ester as the component (C) is a linear or branched, saturated or unsaturated fatty acid having 6 to 18 carbon atoms and a monohydric aliphatic alcohol having 1 to 4 carbon atoms. And an ester thereof are particularly preferable, and a methyl ester is particularly preferable. Preferred examples thereof include methyl caproate, methyl caprylate, methyl caprate, methyl laurate, methyl palmitate, and the like. In the composition of the present invention,
The carboxylic acid ester as the component (C) may be used alone or in combination of two or more kinds. Further, the blending amount is 0.01 to 20% by weight based on the total weight of the composition.
It is selected in the range of. If the blending amount is less than 0.01% by weight, sufficient processability cannot be obtained, and if it exceeds 20% by weight, degreasing property is deteriorated and a cleaning treatment is required in a subsequent step, and the object of the present invention cannot be achieved. . From the viewpoint of the balance of processability and degreasing property, the preferable amount of the carboxylic acid ester is 0.1-
It is in the range of 10% by weight, particularly preferably in the range of 0.5 to 5% by weight.

In the metalworking oil composition of the present invention,
A phosphorus-containing compound is used as the component (D). Examples of the phosphorus-containing compound include phosphoric acid ester, phosphorous acid ester, phosphoric acid ester amine salt, phosphorous acid ester amine salt, phosphoric acid metal salt, acidic phosphoric acid ester, acidic phosphorous acid ester, thiophosphoric acid ester, Examples thereof include thiophosphate ester amine salt, dithiophosphate ester amine salt, and trithiophosphate ester. Of these, phosphoric acid esters and phosphoric acid ester amine salts are particularly preferable from the viewpoint of processability.

Examples of the organic group in the ester of the phosphorus-containing compound include methyl group, ethyl group, n-
Such as propyl group, isopropyl group, n-butyl group, isobutyl group, t-butyl group, amyl group, isoamyl group, hexyl group, octyl group, decyl group and the like, alkyl groups having 1 to 20 carbon atoms, cyclopentyl group, cyclohexyl group, etc. Cycloalkyl group having 5 to 20 carbon atoms, alkenyl group having 2 to 20 carbon atoms such as propenyl group, allyl group and oleyl group, aryl group having 6 to 20 carbon atoms such as phenyl group, naphthyl group, tolyl group and xylyl group And aralkyl groups having 7 to 20 carbon atoms such as benzyl group and phenethyl group. Examples of the organic group in the amine that constitutes the amine salt include an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 5 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, and an aryl group having 6 to 20 carbon atoms. Base, carbon number 7-2
Examples thereof include the aralkyl group of 0, and specific examples thereof include the same groups as those exemplified in the above description of the organic group of ester.

In the composition of the present invention, the phosphorus-containing compound as the component (D) may be used alone or in combination of two or more kinds. Further, the blending amount thereof is selected so that the phosphorus atomic weight is in the range of 10 to 1000 ppm based on the total weight of the composition. If this amount is less than 10 ppm, sufficient processability cannot be obtained, and if it exceeds 1000 ppm, the degreasing property deteriorates. From the viewpoint of the balance between workability and degreasing property, the preferable amount of the phosphorus-containing compound is in the range of 20 to 100 ppm as a phosphorus atom, particularly 30.
A range of -80 ppm is preferred. The metalworking oil composition of the present invention contains the above-mentioned components (A), (B), (C) and (D) as essential components, but the object of the present invention is not impaired. Range, as needed,
As the component (E), various additives usually used in metalworking oils can be appropriately blended. Here, as the additive of the component (E) which is used as necessary, an antioxidant, a viscosity index improver, a rust preventive, a corrosion inhibitor, a defoaming agent, an emulsifier and the like can be mentioned. For example, specific examples of the antioxidant include alkylated diphenylamine and phenyl-α-
Amine-based antioxidants such as naphthylamine and alkylated-α-naphthylamine, 2,6-di-t-butyl-4-
Methylphenol; 4,4'-methylenebis (2,6-
Di-t-butylphenol); 4,4'-bis (2,6
-Di-t-butylphenol); 4,4'-bis (2-
Methyl-6-t-butylphenol); 2,2'-methylenebis (4-ethyl-6-t-butylphenol);
2,2'-methylenebis (4-methyl-6-t-butylphenol); 4,4'-butylidenebis (3-methyl-6-t-butylphenol); 4,4'-thiobis (2-methyl-6-t) -Butylphenol); 4,4 '
Examples thereof include phenolic antioxidants such as -thiobis (3-methyl-6-t-butylphenol); 2,2'-thiobis (4-methyl-6-t-butylphenol).

The metalworking oil composition of the present invention is particularly suitable for use when a stainless steel material, a surface-treated steel sheet or an aluminum material is used as a material to be processed. Further, although it can be applied to a wide range of plastic working and cutting / grinding, it is particularly advantageous to apply it to plastic working. Further, if necessary, the composition of the present invention can be dispersed in water and used as an emulsion-type metalworking oil composition.

[0017]

EXAMPLES Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. The performance of the metalworking oil composition was evaluated by the following tests. (1) Bowden-Lowen friction test Test ball: 1/2 inch SUJ-2 ball, test plate: SUS3
A 04 plate, speed: 10 mm / sec, a Bowden-Leben friction test was performed to measure the friction coefficient and the galling load. (2) Degreasing test test piece: SPCC plate (100 × 200 mm), sample oil amount: 0.5 g, degreasing test was performed under the conditions of a temperature of 20 ° C. and 1
It was observed every 0 hours, and the time until the sample oil was completely degreased was measured. Examples 1 to 3 and Comparative Examples 1 to 7 Metalworking oil compositions were prepared at the blending ratios shown in Table 1 and their performances were evaluated. The results are shown in Table 2.

[0018]

[Table 1]

[0019]

[Table 2]

[0020]

[Table 3]

Note 1) 90% distillation temperature: 230 ° C., sulfur content: 5 ppm or less 2) 90% distillation temperature: 465 ° C., sulfur content: 5 ppm or less 3) n-α-olefin having 12 carbon atoms 4) oleyl phosphorus Acid ester amine salt 5) Ester of caprylic acid and pentaerythritol 0.1% by weight is 50 ppm as a phosphorus atom.

[0022]

[Table 4]

The compositions of Comparative Examples 1 and 6 are not preferable because they have a high coefficient of friction and may easily scratch the work piece during processing.

[0024]

The metalworking oil composition of the present invention can be applied not only to the processing of aluminum materials and surface-treated steel sheets, but also to the processing of stainless steel materials. Moreover, it has good degreasing properties,
In a wide range of processing such as plastic working and cutting / grinding, it is possible to omit the post-process cleaning treatment, resulting in an improvement in productivity.

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Claims (5)

[Claims] 1. (A) 90% distillation temperature is 150-450
(B) a straight chain olefin having 6 to 30 carbon atoms in an amount of 0.05 to 99.9% by weight, based on the total weight of the composition, relative to the base oil at 0 ° C.
(C) 0.01 to 20% by weight of a carboxylic acid ester in which the alcohol component is a monohydric aliphatic alcohol, and (D) a metal-working oil composition prepared by blending a phosphorus-containing compound in a proportion of 10 to 1000 ppm as a phosphorus atom. . 2. The metal working oil composition according to claim 1, wherein the carboxylic acid ester as the component (C) is an ester of a fatty acid having 6 to 18 carbon atoms and a monohydric aliphatic alcohol having 1 to 4 carbon atoms. 3. The phosphorus-containing compound as the component (D) is a phosphoric acid ester, a phosphorous acid ester, a phosphoric acid ester amine salt, a phosphorous acid ester amine salt, a phosphoric acid metal salt, an acidic phosphoric acid ester, an acidic phosphorous acid. The metalworking oil composition according to claim 1, which is at least one selected from acid esters, thiophosphoric acid esters, thiophosphoric acid ester amine salts, dithiophosphoric acid ester amine salts, and trithiophosphoric acid esters. 4. A material to be processed by metal processing is a stainless steel material,
The metalworking oil composition according to claim 1, which is a surface-treated steel sheet or an aluminum material. 5. The metalworking oil composition according to claim 1, wherein the metalworking is plastic working.