JP2001348588A - Lubricating oil composition for plastic working - Google Patents

Abstract

(57) [Problem] To provide a lubricating oil for plastic working such as press working and cold forging, which has excellent lubricity and can be used even under severe lubricating conditions. SOLUTION: As a component (A), 5-99% by mass of zinc dithiophosphate having an alkyl group having 5 or more carbon atoms,
And as component (B), (b1) a divalent or trivalent metal salt of a carboxylic acid having 6 or more carbon atoms, (b2) a base number of 500
One or two kinds selected from divalent or trivalent metal salts of sulfonic acid of mgKOH / g or more, (b3) a specific polyarylene sulfide, and (b4) a sulfur compound such as a mercaptan compound having 8 or more carbon atoms. A lubricating oil composition for plastic working, comprising 1 to 95% by mass of the above and 0 to 80% by mass of a base oil as a component (C).

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 plastic working, and more particularly, to a plastic working lubricating oil composition which can be used under severe conditions such as cold forging and pressing of various metals such as iron alloys and non-ferrous alloys. It relates to a lubricating oil composition.

[0002]

2. Description of the Related Art In a lubricating oil for plastic working, which is used in press working, drawing, ironing, bending, rolling, cold forging, etc., a metal is exposed to severe lubricating conditions. Is done. Therefore, the lubricating oil for plastic working is required to have lubricating properties such as extremely high seizure resistance. Therefore, various types of extreme pressure agents have been used in this type of lubricating oil.

However, recently, there has been an increasing demand for labor saving in processing steps for improving production efficiency, and a lubricating oil for plastic working having higher lubricity is required for realizing the demand. For example, in the cold forging of an iron alloy, a metal surface film treatment for forming a phosphate film such as a bond treatment has been conventionally performed before forging in order to ease the working conditions. However, in the case of bonding, etc., not only the waste liquid treatment involves environmental problems, but also by eliminating this step, it is possible to improve the production efficiency and reduce the cost by shortening the step. However, on the other hand, there is a problem that if the bonding treatment is simply omitted, the lubricating property is insufficient, so that the processing cannot be performed.

[0004] Even in the conventional processing step, a lubricating oil for plastic working having higher lubricity is required due to an increase in processing conditions and the like. Furthermore, difficult-to-machine materials such as iron alloys such as steel, stainless steel and surface-treated steel, aluminum alloys, and non-ferrous alloys such as copper have emerged. However, a higher lubricating oil for plastic working is required.

As a lubricating oil for plastic working which can be used even under severe lubrication conditions as described above, for example, Japanese Unexamined Patent Publication No.
JP-A-118682, JP-A-10-245579, and JP-A-10-273885 each disclose a composition in which a sulfur-based extreme pressure agent such as zinc dithiophosphate and sulfurized fat is mixed with a base oil. .

However, even with the above-mentioned lubricating oil for plastic working, there have been many cases where the lubricating properties are not sufficient, for example, the seizure resistance is actually insufficient or the friction coefficient is large.

[0007]

DISCLOSURE OF THE INVENTION The present invention has been made from the above viewpoint, and has excellent lubricating properties such as extremely high seizure resistance and a small coefficient of friction. An object of the present invention is to provide a lubricating oil for plastic working such as press working, drawing, ironing, bending, rolling, and cold forging.

Another object of the present invention is to provide a lubricating oil for plastic working that can perform cold forging without performing a metal surface film treatment for forming a phosphate film such as a bond treatment before working. I do.

[0009]

Means for Solving the Problems The present inventors have conducted intensive studies to achieve the above object, and as a result, it has been unexpectedly found that a specific zinc dithiophosphate and a metal salt of a specific carboxylic acid are used in combination. The inventors have found that they have high lubricity, and have completed the present invention based on such findings. That is, the gist of the present invention is as follows. [1] As the component (A), the following general formula (1)

[0010]

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(Wherein R ¹ , R ² , R ³ and R ⁴ each independently represent an alkyl group or an alkenyl group having 5 or more carbon atoms) 5-99 mass% of zinc dithiophosphate;
As the component (B), (b1) a divalent or trivalent metal salt of a carboxylic acid having 6 or more carbon atoms, (b2) a base number of 500 mgK
A divalent or trivalent metal salt of sulfonic acid of OH / g or more,
(B3) The following general formula (2)

[0012]

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(Wherein, Ar represents a phenylene group or a naphthylene group which may be substituted with an alkyl group;
Is a positive number such that the compound has a number average molecular weight of 300 to 500,000. And (b4) the following general formula (3):

[0014]

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(Wherein R ⁵ and R ⁶ are each independently a hydrogen atom,
Each represents an alkyl group, an alkenyl group or an alkylphenyl group having 1 to 30 carbon atoms, in which the total number of carbon atoms of R ⁵ and R ⁶ is 8 or more, and x is a positive number of 1 or 2 . 1) to 95% by mass of one or more selected from sulfur compounds represented by
A lubricating oil composition for plastic working containing 80% by mass. [2] The lubricating oil composition for plastic working according to [1], wherein R ¹ , R ² , R ³ and R ^{4 in the} general formula (1) are each independently an alkyl group or an alkenyl group having 8 or more carbon atoms. object. [3] The above-mentioned [1] or [2], wherein the component (b1) is one or more selected from a magnesium salt, a calcium salt, a zinc salt, and an aluminum salt of a carboxylic acid having 8 to 40 carbon atoms. The lubricating oil composition for plastic working according to the above. [4] The lubricating oil composition for plastic working according to any of the above [1] to [3], wherein the component (b2) is a calcium salt of sulfonic acid. [5] The lubricating oil composition for plastic working according to any of the above [1] to [4], wherein the component (b3) is polyphenylene sulfide. [6] As the component (B), (b1) a divalent or trivalent metal salt of a carboxylic acid having 6 or more carbon atoms, and (b2) a divalent or trivalent metal of a sulfonic acid having a base number of 500 mgKOH / g or more Salt, (b3) the following general formula (2)

[0016]

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(Wherein, Ar represents a phenylene group or a naphthylene group which may be substituted with an alkyl group;
Is a positive number such that the compound has a number average molecular weight of 300 to 500,000. And (b4) the following general formula (3):

[0018]

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(Wherein R ⁵ and R ⁶ are each independently a hydrogen atom,
Or a group having 1 to 30 carbon atoms, an alkyl group, an alkenyl group or an alkylphenyl group, wherein the total number of carbon atoms of R ⁵ and R ⁶ is 8 or more, and x is a positive number of 1 or 2. )
The lubricating oil composition for plastic working according to any one of the above [1] to [5], containing one or more selected from sulfur compounds represented by [7] The lubricating oil composition for plastic working according to any one of [1] to [6], wherein the compounding ratio of the component (A) is 5 to 50% by mass. [8] The lubricating oil composition for plastic working according to any one of [1] to [7], wherein the lubricating oil for plastic working is a lubricating oil for cold forging.

[9] The above-mentioned [1] to [7], wherein the lubricating oil for plastic working is a lubricating oil for press working, a lubricating oil for drawing, lubricating oil for ironing, lubricating oil for bending or lubricating oil for rolling. The lubricating oil composition for plastic working according to any one of the above.

[0020]

Embodiments of the present invention will be described below. In the lubricating oil composition for plastic working of the present invention,
As the component (A), the composition contains the zinc dithiophosphate represented by the general formula (1).

In the formula, R ¹ , R ² , R ³ and R ⁴ each independently represent an alkyl group or an alkenyl group having 5 or more carbon atoms. The number of carbon atoms is more preferably 8 or more, still more preferably 10 or more, and particularly preferably 12 or more. If the number of carbon atoms is less than 5, it is difficult to ensure sufficient lubricity of the lubricating oil for plastic working. In other words, when the number of carbon atoms is 6 or more, the lubricating property can be enhanced, and when the number of carbon atoms is 8 or more, the effect is higher.
The above is particularly remarkable. On the other hand, the upper limit of the carbon number is not particularly limited, but is preferably 30 and more preferably 24 from the viewpoint of easy production and handling.

Further, R ¹ , R ² , R in the general formula (1)
The alkyl group and alkenyl group of ³ and R ⁴ may be linear or branched. Further, the alkyl group and alkenyl group may be a primary (primary) alkyl group or alkenyl group, and may be a secondary (secondary) alkyl group or alkenyl group, or a tertiary (tertiary) alkyl group or alkenyl group. It may be a group.

In the general formula (1), R ¹ ,
Specific examples of R ² , R ³ and R ⁴ include, for example, pentyl group (including various isomers; the same applies hereinafter), hexyl group, heptyl group, octyl group, nonyl group, decyl group, undecyl group, dodecyl group (lauryl) Group), tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, eicosyl, heneicosyl, docosyl, tricosyl, tetracosyl, pentacosyl, hexacosyl, heptacosyl, optacosyl Such as an alkyl group, a pentenyl group, a hexenyl group, a heptenyl group, an octenyl group,
Nonenyl group, decenyl group, undecenyl group, dodecenyl group, tridecenyl group, tetradecenyl group, pentadecenyl group, hexadecenyl group, heptadecenyl group, octadecenyl group (such as oleyl group), nonadecenyl group, eicosenyl group, heenaicosenyl group, docosenyl group, trichosenyl group Tetracosenyl group, heptacosenyl group, pentacosenyl group, hexacosenyl group, heptacosenyl group,
An alkenyl group such as an octacosenyl group is exemplified.

In the general formula (1), R ¹ , R ² , R
³ and R ⁴ are independent of each other, and may be the same or different. The zinc dithiophosphate of the present invention represented by the general formula (1) may be used alone or in a combination of two or more.

In the lubricating oil for plastic working of the present invention, the component (A), zinc dithiophosphate, is used in an amount of 5 parts by weight based on the composition.
９９99% by mass. The mixing ratio of dithiophosphoric acid is 5
If it is less than mass%, the desired lubricity cannot be obtained. More preferably, the mixing ratio of the zinc dithiophosphate is 10% by mass or more.

On the other hand, the upper limit of the mixing ratio of the zinc dithiophosphate of the component (A) is 99% by mass. This is to leave room for mixing the component (B) exhibiting a synergistic effect. About the upper limit of this compounding ratio, 95 mass% is more preferable, and 90 mass% is especially preferable.

In the lubricating oil composition for plastic working in the present invention, one or more kinds selected from (b1) to (b4) are blended as the component (B) described later together with the component (A). When a divalent or trivalent metal salt of a carboxylic acid having 6 or more carbon atoms, which is the component (b1), is used as the component (B), that is, as the component (B), (b1) or (b)
When a mixture of the component (B) other than the component (1) and the component (b1) is used, the mixing ratio of the zinc dithiophosphate of the component (A) is 5
The desired lubricity can be obtained even when the content is 50% by mass. In this case, the mixing ratio of the zinc dithiophosphate of the component (A) is more preferably 10% by mass or more, and particularly preferably 15% by mass or more. In this case, the upper limit of the mixing ratio of zinc dithiophosphate is more preferably 45% by mass, and more preferably 40% by mass.
Is particularly preferred.

In the lubricating oil composition for plastic working of the present invention, the component (B) is used as the component (B) together with the component (A).
A divalent or trivalent metal salt of a carboxylic acid having 6 or more carbon atoms,
(B2) a divalent or trivalent metal salt of sulfonic acid having a base number of 500 mgKOH / g or more, and (b3) a general formula (2)
And (b4) one or more selected from sulfur compounds represented by the general formula (3).

As the component (b1), a divalent or trivalent metal salt of a carboxylic acid having 6 or more carbon atoms is used. When the carboxylic acid constituting the salt has less than 6 carbon atoms, the effect of enhancing the lubricity of the lubricating oil for plastic working is not sufficient.
Therefore, a carboxylic acid having 8 or more carbon atoms is more preferable, and a carboxylic acid having 12 or more carbon atoms is particularly preferable. The upper limit of the number of carbon atoms of the carboxylic acid is not particularly limited, but is preferably 40 from the viewpoint of easy handling.
0 is more preferable, and 24 is particularly preferable.

Examples of the type of the carboxylic acid include fatty acids, dimer acids and trimer acids of fatty acids, aliphatic dicarboxylic acids, and aromatic dicarboxylic acids. Specifically, for example, as fatty acids, straight chain of caproic acid, enanthic acid, caprylic acid, capric acid, pelargonic acid, lauric acid, myristic acid, palmitic acid, stearic acid, arachinic acid, behenic acid, cerotic acid, etc. Fatty acids, or 2,2-dimethylbutane, 2-methylhexanoic acid,
5-methylhexanoic acid, 2,2-dimethylheptanoic acid,
2-ethyl-2-methylbutane, 2-ethylhexanoic acid (octylic acid), dimethylhexanoic acid, 2-n-propyl-pentanoic acid, 3,5,5-trimethylhexanoic acid,
Dimethyloctanoic acid, isotridecanoic acid, isomyristic acid, isostearic acid, branched fatty acids such as isoarachinic acid, and further, unsaturated fatty acids such as palmitoleic acid, oleic acid, elaidic acid, linoleic acid, linolenic acid, and ricinoleic acid, These dimer acids and trimer acids are also included. Examples of the dicarboxylic acid include adipic acid, azelaic acid, and sebacic acid. Examples of the aromatic dicarboxylic acid include phthalic acid, isophthalic acid, and terephthalic acid.

On the other hand, examples of the metal constituting the divalent or trivalent metal salt of a carboxylic acid include divalent metals such as alkaline earth metals such as magnesium, calcium and strontium, and zinc group metals such as zinc and cadmium. , Aluminum, indium, titanium and other trivalent metals (aluminum group metals). Of these, magnesium, calcium, zinc, and aluminum are preferred,
Particularly, zinc is preferable.

(B2) which is one of the components (B) of the present invention
As the component, an alkaline earth metal salt of sulfonic acid (sulfonate) having a base number of 500 mgKOH / g or more is used.

This is a so-called superbasic sulfonate. The sulfonic acid constituting the sulfonate is obtained by sulfonating an alkyl aromatic compound, for example, petroleum sulfonic acid, alkylbenzene by-produced from a detergent plant, polyolefin which is alkylated to benzene, dinonylnaphthalene And the like, and synthetic sulfonic acids obtained by sulfonating alkylnaphthalene. The molecular weight of these alkyl aromatic compounds is usually from 100 to 2,000,
Those having a size of from 1,000 to 1,000 are used. For specific examples of the divalent or trivalent metal constituting the sulfonate,
The same metals as those used in the divalent or trivalent metal salt of the carboxylic acid of the component (b1) can be mentioned. Of these metals, magnesium, calcium, zinc, and aluminum are preferable because of their excellent effect, and calcium is particularly preferable.

The superbasic sulfonate can be usually obtained by reacting the above sulfonic acid with a salt of a divalent or trivalent metal in the presence of carbon dioxide gas. In the present invention, the degree of basicity of the superbasic sulfonate needs to be 500 mgKOH / g or more. If the basicity is less than 500 mgKOH / g, the effect of improving lubricity cannot be achieved. Here, the base number is a value measured by a hydrochloric acid method specified in JIS K2501.

The alkaline earth metal salt of sulfonic acid may be used alone or in combination of two or more. As the component (b3) which is one of the components (B) of the present invention, a polyarylene sulfide compound represented by the general formula (2) is used. In the formula, Ar represents a phenylene group or a naphthylene group. These may be substituted with an alkyl group. In this case, the optionally substituted alkyl group usually has 1 to 20 carbon atoms and may be linear or branched, and may be saturated or unsaturated. Further, a plurality of the substituents may be substituted on a phenylene group or a naphthylene group. m is a molecular weight (number average molecular weight) of the compound of the general formula (2) of 300 to 300.
It is a positive number of 500,000. The lower limit of the molecular weight is more preferably 500, and particularly preferably 1,000. On the other hand, the upper limit of the molecular weight is more preferably 200,000,
100,000 is particularly preferred. Among them, polyphenylene sulfide in which Ar is a phenylene group is particularly preferable in terms of availability and economy.

Next, as the component (b4) which is one of the components (B) of the present invention, a sulfur compound represented by the general formula (3) is used. In the general formula (3), R ⁵ and R ⁶ are each independently a hydrogen atom, and each has 1 to 30 carbon atoms, preferably 4 to 30 carbon atoms.
20 alkyl groups, alkenyl groups or alkylphenyl groups, wherein the total number of carbon atoms of R ⁵ and R ⁶ is 8 or more, preferably 12 or more, and x is a positive number of 1 or 2. Therefore, the sulfur compound represented by the general formula (3) includes a mercaptan compound, a monosulfide, and a disulfide. Compounds in which the total number of carbon atoms of R ⁵ and R ⁶ in the general formula (3) is less than 8 have an insufficient effect of improving seizure resistance and the like in the presence of the component (A) and are not suitable. On the other hand, the upper limit of the total number of carbon atoms of R ⁵ and R ⁶ is not particularly limited, but is preferably 50 or less, and more preferably about 40 or less from the viewpoint of availability.
Of the sulfur compounds represented by the general formula (3) used in the present invention, preferred specific examples of the mercaptan compound include, for example, octyl mercaptan, decyl mercaptan, dodecyl mercaptan, tetradecyl mercaptan, hexadecyl mercaptan, octadecyl mercaptan (stearyl) Mercaptans), straight-chain saturated alkyl mercaptans such as eicosyl mercaptan, and corresponding branched saturated alkyl mercaptans and alkenyl mercaptans which are unsaturated groups.

Specific examples of the monosulfide compound among the sulfur compounds represented by the general formula (3) used in the present invention include dibutyl monosulfide, dihexyl monosulfide, diheptyl monosulfide, dioctyl monosulfide, dinonyl. Monosulfide, didecyl monosulfide, diundecyl monosulfide, didodecyl monosulfide (dilauryl monosulfide), ditetradecyl monosulfide, dihexadecyl monosulfide and the like can be mentioned. Further, specific examples of the disulfide compound include a disulfide compound corresponding to the above-described monosulfide compound. In the present invention, among these sulfur compounds represented by the general formula (3), a mercaptan compound is particularly preferable in terms of an effect of enhancing lubricity.

These sulfur compounds may be used alone or as a mixture of two or more. (B1)-
All of the components (B) in (b4) have a remarkable effect of increasing seizure resistance and reducing the coefficient of friction in the presence of the component (A), and are also excellent in stability (thermal stability).

In the lubricating oil composition for plastic working of the present invention, the component (B) is used in a total amount of 1 to 95 based on the composition.
% By mass. If the blending ratio of the component (B) is less than 1% by mass, remarkable improvements in seizure resistance and friction coefficient cannot be realized even in the presence of the component (A). The lower limit of the mixing ratio of the component (B) is more preferably 3% by mass, further preferably 5% by mass, and particularly preferably 10% by mass. On the other hand, the upper limit of the blending ratio of the component (B) is more preferably 80% by mass, further preferably 60% by mass, and particularly preferably 50% by mass. Both are for keeping the blend balance with the component (A).

In the lubricating oil composition for plastic working of the present invention, (b1), (b)
2) One or more components selected from the components (b3) and (b4) are blended. Therefore, in the method of blending the component (B), the component (b1), the component (b2), the component (b3), and the component (b4) may be blended.

In the composition containing one kind of the component (B), it is one of the preferable embodiments to mix the component (b1) as the component (B). In this embodiment, there is an effect that the seizure resistance becomes particularly high, and even if the mixing ratio of the component (A) is relatively small, an improvement in lubricity can be achieved.

As the component (B), (b1) to (b)
In a case where two or more of the components (4) are blended, it is preferable to blend the component (b1) and further blend one or more of the components (b2) to (b4). One. As described above, in the presence of the component (A), the composition containing the component (b1) and one or more other components (b2) to (b4) is more effective than the composition containing only one component (B). This has the effect of maintaining high seizure resistance and further reducing the coefficient of friction. As described above, when the component (b1) is included,
As described above, the effect of the present invention can be exhibited even when the mixing ratio of the component (A) is 50% by mass or less. In addition, when the compounding ratio of the component (A) is set to 50% by mass or less, it is a preferable embodiment that the composition usually contains a base oil (component C).

Further, as the component (B), (b2) to (b)
4) An embodiment in which two or more types selected from the components are used in combination is also one of the preferred embodiments. In the presence of the component (A), for example, the components (b2) and (b3), the components (b2) and (b)
Also in the case of the composition containing the component (4) and the components (b3) and (b4), there is an effect that the seizure resistance is kept high and the friction coefficient is further reduced.

The components (B) (b1) to (b)
4) (b1) to when two or more components are blended
The mixing ratio of each component (b4) is not particularly limited as long as the sum is within the mixing ratio of the component (B), but may be any value, but each component is mixed in the range of 5 to 30% by mass. Is preferred.

In the present invention, a base oil may be blended as the component (C). Base oils that may be included in the present invention include all mineral and / or synthetic oils. As a preferable mineral oil, for example, a lubricating fraction obtained by distilling crude oil under normal pressure and reduced pressure can be used, and this is usually desolvated by solvent, solvent extraction, hydrocracking, solvent dewaxing, catalytic dewaxing,
A paraffinic or naphthenic mineral oil obtained by refining by hydrorefining, washing with sulfuric acid, clay treatment or the like is used. Examples of the synthetic oil include poly-α-olefins such as polybutene and 1-decene oligomer, alkylbenzene, alkylnaphthalene, various esters, polyoxyalkylene glycol, and polyphenylether. The kinematic viscosity of these base oils is not particularly limited, but usually the kinematic viscosity at 40 ° C. is 1 to 2,000 mm ^2.
/ S, preferably ^{2 to} 1,000 mm ² / s, more preferably 10 to 500 mm ² / s. One type of these mineral oils and synthetic oils may be used alone, or two or more types may be used in combination. In the present invention, the above base oil is blended usually in the range of 0 to 80% by mass, preferably 0 to 70% by mass based on the composition. In particular, in a composition containing (b1) as the component (B) and in which the mixing ratio of the component (A) is 50% by mass or less, the mixing ratio of the base oil is 20 to 8%.
It is preferable to mix 0 mass%.

In the present invention, various additives such as an antioxidant, an extreme pressure agent, a degreasing agent, a defoaming agent and the like may be added, if desired, in addition to the above components. Among the various additives, antioxidants include, for example, phenol (di-t)
tert-butyl paracresol, etc.) amine-based (dioctyldiphenylamine, etc.) compounds, as extreme pressure agents, phosphate esters (tricresyl phosphate, trioleyl phosphate, etc.), acidic phosphate esters (monooleyl acid phosphate, dioleyl) Acid phosphate amines), acidic phosphoric acid ester amine salts (eg, oleylamine salt of monooleyl acid phosphate), phosphites (eg, dioleyl acid phosphite, tridecyl phosphite, trisnonyl phenyl phosphite), fats and oils (tallow, pork) Fat, soybean oil, rapeseed oil, rice bran oil, coconut oil, palm oil, etc.), sulfurized oil, olefin polysulfide, esters (hindered ester, polyhydric alcohol ester, polyhydric alcohol partial ester, etc.), fatty acid ( Gaulin acid, palmitic acid, behenic acid), and carboxylic acids, sulfonic acids, phenols, and metal salts and amine salts such as salicylic acid. Alkenyl sulfosuccinic acid is used as a degreasing agent, and silicone oil is used as a defoaming agent.

Each of these additives is usually 0% based on the composition.
-20% by mass, preferably 0.01-10% by mass. The lubricating oil composition for plastic working of the present invention obtained by blending the above-mentioned components (A) and (B), blending the component () if necessary, and further blending other additives, The kinematic viscosity is not particularly limited, but from the viewpoint of handleability and economy, the kinematic viscosity at 40 ° C. is preferably 1 to 2,000 mm ² / s,
1,000 mm ² / s is more preferable, and 10-5
Those having a thickness of 00 mm ² / s are particularly preferably used.

The lubricating oil composition for plastic working according to the present invention comprises:
Can be used as a lubricating oil for any plastic working, especially, for example, steel, stainless steel, iron alloys such as surface-treated steel,
It is suitable as a lubricating oil for press working, drawing, ironing, bending, rolling, cold forging, and the like of non-ferrous alloys such as aluminum alloys and copper. Further, when used for cold forging, forging can be performed without performing a metal surface coating treatment such as a bond treatment for forming a phosphate coating before the working.

[0049]

EXAMPLES Next, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples. [Examples 1 to 21 and Comparative Examples 1 to 3] Lubricating oil compositions for plastic working according to the present invention were produced according to the compositions shown in Tables 1 to 3. Further, as shown in Table 4, for comparison, a composition was also prepared for a compound in which the component (B) did not satisfy the requirements. In addition, each component used is as follows. (A component) A1: Zinc dilauryl dithiophosphate (R in general formula (1)
¹ to R ⁴ is a linear alkyl group of 12 carbon atoms) A2: Di n- octyl zinc dithiophosphate (general formula (1)
Linear alkyl group R ¹ to R ⁴ is a carbon number 8) (B component) b11: zinc stearate b12: Zinc octoate (zinc 2-ethylhexanoate) b21: sulfonate (base number 520MgKOH /
g) b22: sulfonate (base number 400 mgKOH /
g) b31: polyphenylene sulfide (number average molecular weight 3,000) b41: stearyl mercaptan b51: sulfurized oil (sulfur content: 11% by mass) (C component) C1: paraffinic mineral oil (kinematic viscosity at 40 ° C. 92
mm ² / s) C 2: Naphthenic mineral oil (kinematic viscosity 102 at 40 ° C.
mm ² / s) The compositions of Examples and Comparative Examples were evaluated for the performance shown below, and the results are shown in Tables 1 to 3. [Evaluation method] Seizure load was evaluated by a Falex seizure test. The test conditions are specified pin (AISI C-1137) and block (AIS
Using IC-3135), a step-up load method at a rotation speed of 600 rpm and a load of 222 N / min, and a lubrication method was performed by applying 0.02 ml to a pin. The coefficient of friction was measured in accordance with JASO M314-88. Oil temperature is 5
0 ° C. According to the thermal stability test JIS K 2540, the appearance of the sample after observation at 170 ° C. for 24 hours was observed.

[0050]

[Table 1]

[0051]

[Table 2]

[0052]

[Table 3]

[0053]

[Table 4]

From the evaluation results in Tables 1, 2 and 3, the lubricating oil composition for plastic working of the present invention has excellent seizure resistance, a small friction coefficient, and is stable in a thermal stability test. On the other hand, as shown in Table 4, as the component (B), the basicity was 400%.
When the sulfonate of mgKOH / g was used (Comparative Example 1), and when the sulfurized fat was added (Comparative Examples 2 and 3), the seizure resistance was poor and the coefficient of friction was large. Further, the compositions containing the sulfurized fats and oils as the B component (Comparative Examples 2 and 3) all solidify in the thermal stability test.

[0055]

The lubricating oil composition for plastic working according to the present invention is excellent in lubricity such as high seizure resistance and small friction coefficient. Further, thermal stability is also good. Therefore, it can be used as a lubricating oil for plastic working such as pressing, drawing, ironing, bending, rolling, and cold forging that can be used even under severe lubrication conditions. Further, the lubricating oil composition for plastic working according to the present invention is a lubricating oil that can be cold forged without performing a metal surface film treatment for forming a phosphate film such as a bond treatment before working.

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Claims (9)

[Claims] 1. Component (A) represented by the following general formula (1): (Wherein R ¹ , R ² , R ³ and R ⁴ each independently represent an alkyl group or an alkenyl group having 5 or more carbon atoms) 5 to 99% by mass of zinc dithiophosphate, (B) As an ingredient,
(B1) a divalent or trivalent metal salt of a carboxylic acid having 6 or more carbon atoms, (b2) a divalent or trivalent metal salt of sulfonic acid having a base number of 500 mgKOH / g or more, (b3) a general formula represented by the following general formula ( 2) (In the formula, Ar represents a phenylene group or a naphthylene group which may be substituted with an alkyl group, and m is a positive number such that the compound has a number average molecular weight of 300 to 500,000.) Polyarylene sulfide, and (b
4) The following general formula (3) (In the formula, R ⁵ and R ⁶ are each independently a hydrogen atom, each is an alkyl group, an alkenyl group or an alkylphenyl group having 1 to 30 carbon atoms, and the total number of carbon atoms of R ⁵ and R ⁶ is 8 And x is a positive number of 1 or 2.) One or two or more sulfur compounds selected from the group consisting of 1 to 95
A lubricating oil composition for plastic working, which contains 0 to 80% by mass of a base oil as a component (C) by mass. 2. R ¹ , R ² , R ³ and R in the general formula (1)
^The lubricating oil composition for plastic working according to claim 1, wherein ⁴ is independently an alkyl group or an alkenyl group having 8 or more carbon atoms. 3. The composition according to claim 1, wherein the component (b1) is one or more selected from a magnesium salt, a calcium salt, a zinc salt, and an aluminum salt of a carboxylic acid having 8 to 40 carbon atoms. The lubricating oil composition for plastic working according to the above. 4. The lubricating oil composition for plastic working according to claim 1, wherein the component (b2) is a calcium salt of sulfonic acid. 5. The lubricating oil composition for plastic working according to claim 1, wherein the component (b3) is polyphenylene sulfide. 6. The component (B) includes (b1) a divalent or trivalent metal salt of a carboxylic acid having 6 or more carbon atoms, and (b)
2) a divalent or trivalent metal salt of sulfonic acid having a base number of 500 mgKOH / g or more; (b3) a following general formula (2): (In the formula, Ar represents a phenylene group or a naphthylene group which may be substituted with an alkyl group, and m is a positive number such that the compound has a number average molecular weight of 300 to 500,000.) Polyarylene sulfide, and (b
4) The following general formula (3) (Wherein, R ⁵ and R ⁶ each independently represent a hydrogen atom or a carbon atom
~ 30 alkyl groups, alkenyl groups or alkylphenyl groups, wherein the total number of carbon atoms of R ⁵ and R ⁶ is 8 or more, and x is a positive number of 1 or 2. The lubricating oil composition for plastic working according to any one of claims 1 to 5, comprising one or more selected from sulfur compounds represented by the formula (1). 7. The compounding ratio of the component (A) is 5 to 50% by mass.
The lubricating oil composition for plastic working according to any one of claims 1 to 6, wherein 8. The lubricating oil composition for plastic working according to claim 1, wherein the lubricating oil for plastic working is a lubricating oil for cold forging. 9. The lubricating oil for plastic working is lubricating oil for press working, lubricating oil for drawing, lubricating oil for ironing, lubricating oil for bending or lubricating oil for rolling. The lubricating oil composition for plastic working according to any one of the above.