JPH11286694A - Lubricating oil composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide lubricating oil compositions for cold rolling of aluminum or aluminum alloys which are excellent in rolling properties and can efficiently prevent formation of white rust on rolled plates after rolling. SOLUTION: A desired lubricating oil composition comprises (a) 15-99.48 mass% at least one member selected from mineral oils, fats and oils and synthetic oils; (b) 0.01-25 mass% nonionic emulsifier; (c) 0.5-50 mass% fatty acid; and (d) 0.01-10 mass% at least one member selected from an amine salt of carboxyethylthiosuccinic acid, an amine salt of a monoalkyl-amide compound of carboxyethylthiosuccinic acid and an amine salt of 2-benzothiazolethiosuccinic acid. Or (e) 0. 01-25 mass% alkanolamine is incorporated instead of component (b) in said composition.

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 used for cold rolling of aluminum or an aluminum alloy (hereinafter, simply referred to as aluminum). This has an effect of being excellent in prevention of occurrence.

[0002]

2. Description of the Related Art Conventionally, lubricating oils in which a higher alcohol and a fatty acid ester are blended with a low-viscosity mineral oil have been used for cold rolling of aluminum.

On the other hand, the use of aqueous aluminum cold rolling oil has been studied for the purpose of improving productivity, disaster prevention and work environment. Aqueous rolling oils are said to be advantageous for high-pressure rolling because of their excellent cooling properties and flame retardancy as compared with conventional mineral oil-based rolling oils. However, white rust may be generated on the aluminum surface after rolling, and when rust is generated, there is a disadvantage that the surface properties of the product are reduced and the value as a product is reduced.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above circumstances, and has been made in consideration of the above-mentioned circumstances, and has been made in consideration of the aluminum surface after rolling without impairing the rollability and flame retardancy of aqueous aluminum cold rolling oil. The purpose of the present invention is to suppress the occurrence of white rust and maintain the surface quality.

[0005]

Means for Solving the Problems The present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, have found that a specific nonionic emulsifier, a specific alkanolamine, a base oil, a fatty acid and a specific carboxyethyl Aluminum after rolling without impairing rollability and flame retardancy by incorporating amine salt of thiosuccinic acid, amine salt of monoalkylamide compound of carboxyethylthiosuccinic acid or amine salt of 2-benzothiazolethiosuccinic acid The present inventors have found that it is possible to provide an excellent processed surface and suppress generation of white rust, and have completed the present invention.

That is, the gist of the first invention is that (a) 15 to 99.48 mass% of one or more kinds selected from mineral oils, fats and oils, and (b) 0.01% of nonionic emulsifier. And (c) an amine salt of carboxyethylthiosuccinic acid, an amine salt of a monoalkylamide compound of carboxyethylthiosuccinic acid or 2-benzothiazole. A lubricating oil composition for cold rolling of aluminum or an aluminum alloy, which comprises one or more selected from amine salts of thiosuccinic acid in a ratio of 0.01 to 10% by mass; The gist of the second invention is that (a) 15 to 99.48% by mass of one or more selected from mineral oil, fat or oil, and (c) 0.5 to 50% by weight of fatty acid.
(D) one or two or more selected from amine salts of carboxyethylthiosuccinic acid amine salt, carboxyethylthiosuccinic acid monoalkylamide compound and 2-benzothiazolethiosuccinic acid amine salt, .
A lubricating oil composition for cold rolling of aluminum or an aluminum alloy, characterized in that the lubricating oil composition contains 0.01 to 10% by mass and (e) 0.01 to 25% by mass of an alkanolamine.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail. The base oil of the component (a) used in the lubricating oil compositions of the first and second inventions may be any of mineral oil, fat or synthetic oil, and may be used alone or in combination of two or more. Good. Here, mineral oil includes, for example, white kerosene, spindle oil, machine oil, turbine oil, cylinder oil, and the like.As fats and oils, for example, whale oil, beef tallow, pork oil, rapeseed oil, castor oil, nuka oil, palm oil And synthetic oils such as polyalphaolefin (PAO), polybutene, and esters, but are not limited thereto. It is considered that the fats and oils act as a base oil in the present invention and also act as an oil agent. Among these base oils, preferably, the viscosity is 0.5 to 200 mm ² /
s (40 ° C.), particularly preferably ^{2 to} 80 mm ²
/ S is used.

[0008] viscosity of 0.5 mm ² / s smaller than lubrication is not adequate low, reducing the quality of the aluminum plate surface after rolling will poor lubricity is less than 2mm ² / s, 200mm ² If it exceeds / s, the amount of adhesion to the aluminum plate surface after rolling increases, which is not preferable.

As the fatty acid which is the component (c) used in the lubricating oil compositions of the first and second inventions, fatty acids having 10 to 22 carbon atoms are suitable, such as capric acid, undecanoic acid and lauric acid. , Tridecanoic acid, myristic acid, palmitic acid, stearic acid, undecylenic acid, lauroleic acid, erucic acid, lindelic acid, tuzunic acid,
Fisthenic acid, myristoleic acid, palmitoleic acid, petroselinic acid, oleic acid, elaidic acid, asclepic acid, paxenoic acid, linoleic acid, hiragoic acid, eleostearic acid, punicic acid, linolenic acid, moloctic acid,
Stearidonic acid, Talilic acid, Stearolic acid, Crepenic acid, Ximenic acid, Malvanic acid, Hydnocarpinic acid, Shoalmoog acid, Gollic acid, Savininic acid,
Examples include iprolic acid, yarapinolic acid, uniperic acid, ambrettolic acid, aluritic acid, ricinoleic acid, camroleic acid, and ricanoic acid. Among these fatty acids, fatty acids having 14 to 20 carbon atoms are generally used. In view of lubricity and solubility in a base oil, unsaturated fatty acids, especially oleic acid, are preferable. These fatty acids may be used alone or in combination of two or more.

The content of the component (c) is 0.5 to 50% by mass, preferably 1 to 30% by mass. When the content of the component (c) is less than 0.5% by mass, the lubricating property is insufficient and the lubricating property is insufficient. In addition, when the content of the component (c) exceeds 50% by mass, the effect of suppressing metal corrosion of piping and the like becomes low, which is not preferable.

The component (d) used in the lubricating oil compositions of the first and second inventions is an amine salt of carboxyethylthiosuccinic acid, an amine salt of a monoalkylamide compound of carboxyethylthiosuccinic acid or 2-amine. It is an amine salt of benzothiazole thiosuccinic acid.

The structural formulas of carboxyethylthiosuccinic acid, a monoalkylamide compound of carboxyethylthiosuccinic acid, and 2-benzothiazolethiosuccinic acid are described below with just in mind.

[0013]

Embedded image

The alkyl of the monoalkylamide compound of carboxyethylthiosuccinic acid is a linear or branched alkyl group having 1 to 20, preferably 6 to 15 carbon atoms. Specifically, monoamides such as hexyl monoamide, heptyl monoamide, octyl monoamide, nonyl monoamide, decyl monoamide, undecyl monoamide, dodecyl monoamide, tridecyl monoamide, tetradecyl monoamide, and pentadecyl monoamide of the above carboxyethylthiosuccinic acid. And carbon number 8
To 12-ethylhexylmonoamide, dodecylmonoamide and the like are more preferred.

Examples of the amine compound used as the amine of the amine salt include alkanolamines. Examples of the alkanolamine include monoethanolamine, diethanolamine, triethanolamine, N-methylethanolamine, N, N-dimethylethanolamine, N-ethylethanolamine, N,
Ethanolamines such as N-diethylethanolamine, N-isopropylethanolamine, N, N-diisopropylethanolamine; monoisopropanolamine, diisopropanolamine, triisopropanolamine, N-methylisopropanolamine, N, N
-Dimethylisopropanolamine, N-ethylisopropanolamine, N, N-diethylisopropanolamine, N-isopropylisopropanolamine,
Isopropanolamines such as N, N-diisopropylisopropanolamine; mono-n-propanolamine, di-n-propanolamine, tri-n-propanolamine, N-methyl-n-propanolamine,
N, N-dimethyl-n-propanolamine, N-ethyl-n-propanolamine, N, N-diethyl-n-
N-propanolamines such as propanolamine, N-isopropyl-n-propanolamine, N, N-diisopropyl-n-propanolamine; monobutanolamine, dibutanolamine, tributanolamine, N-methylbutanolamine, N-dimethylbutanolamine, N-ethylbutanolamine, N, N
Butanolamines such as -diethylbutanolamine, N-isopropylbutanolamine, N, N-diisopropylbutanolamine and the like, preferably ethanolamines, that is, monoethanolamine;
Diethanolamine and triethanolamine.

The method for producing each amine salt is not particularly limited. For example, it can be produced by sufficiently mixing a compound such as carboxyethylthiosuccinic acid, a monoalkylamide compound of carboxyethylthiosuccinic acid or 2-benzothiazolethiosuccinic acid with an amine, and two components.

The preferred compounding ratio of the various compounds to the amine is not particularly limited, but it is generally preferred that the molar ratio of amine per carboxyl group is in the range of 0.2 to 3, and more preferably in the range of 0.5 to 2. Is usually used. However, the mixing ratio of the two is not limited to the above range. When both are mixed and the salt thereof is converted into an 8% aqueous solution,
The mixing ratio is pH 7 to 11, preferably pH 7
It is sufficient that the compounding ratio is up to 9. If the ratio is out of this range, if the pH is lower than 7, it is difficult to stably exist in water, and p
If it exceeds H11, the aluminum surface may be discolored, which is not preferable.

The nonionic emulsifier, which is the component (b) used in the lubricating oil composition of the first invention, is a compound having both a lipophilic group and a hydrophilic group. Oleyl ether, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, polyoxyethylene lauryl ether, polyoxyethylene tridecyl ether, etc.Alkyl phenol types such as polyoxyethylene nonyl phenyl ether, polyoxyethylene octyl phenyl ether , And as the ester type,
Polyoxyethylene monolaurate, polyoxyethylene monostearate, polyoxyethylene monooleate, polyethylene glycol tallow fatty acid ester, etc.
In addition, as the sorbitan ester type, sorbitan monocaprylate, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan monooleate, sorbitan sesquiolate, sorbitan trisiolate, etc. Examples thereof include oxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monopalmitate, polyoxyethylene sorbitan monostearate, and polyoxyethylene sorbitan monooleate.

Among these nonionic emulsifiers, the ester type is preferable, and for example, polyoxyethylene monolaurate, polyoxyethylene monostearate, polyoxyethylene monooleate and polyethylene glycol tallow fatty acid ester are preferable. These emulsifiers may be used alone or in a combination of two or more.

In the lubricating oil composition of the first invention,
The compounding amount of the nonionic emulsifier (b) is 0.0
The content is 1 to 25% by mass, and preferably 0.1 to 10% by mass.

When the blending ratio of the component (b) is less than 0.01% by mass, the emulsion is weak and unstable as an emulsion, and when it exceeds 25% by mass, the emulsion is too strong and the emulsion becomes too strong. Is too small, and it is difficult to obtain a particle size excellent in rollability, which is not preferable.

The alkanolamine which is the component (e) used in the lubricating oil composition of the second invention is the alkanolamine exemplified as the alkanolamine used for producing the amine salt of the component (d). Can be used. Among them, particularly preferred are ethanolamines, that is, monoethanolamine, diethanolamine, and triethanolamine. These alkanolamines may be used alone or as a mixture.

In the second invention, the alkanolamine of the component (e) reacts with the fatty acid of the component (c) to form an alkanolamine salt of the fatty acid, which contributes to the emulsification of the lubricating oil composition as an anionic emulsifier. It is.
Since the fatty acid of the component (c) is a weak acid and the alkanolamine is a weak base, there is an equilibrium between the two reactions, and the fatty acid and the alkanolamine used do not all react. Also, since fatty acids themselves act as oil agents, the ratio of fatty acid to alkanolamine can vary over a wide range rather than the ratio required to form a salt.

Therefore, the content of the component (e) is 0.0%
1 to 25% by mass, preferably 0.1 to 15% by mass
It is. When the content of the component (e) is less than 0.01% by mass, the emulsification is weak and the emulsion is unstable.
If it exceeds 5% by mass, the emulsion is too strong and the emulsion has too small an oil droplet particle size, making it difficult to obtain a particle size excellent in rollability, which is not preferable.

Further, in the lubricating oil composition of the present invention,
In addition to the above components, components used in conventional metalworking oils or rolling oil compositions, such as oiliness agents, extreme pressure agents, antioxidants,
Various additives such as a rust inhibitor, a bactericide, and an antifoaming agent can be appropriately added as desired.

The oily agent includes, for example, fats and oils and fatty acid esters. The extreme pressure agent includes, for example, phosphorus compounds such as tricresyl phosphate. The antioxidant includes, for example, 2,4. -Di-tert
Phenol compounds such as -butyl-p-cresol and the like; rust preventives such as 1,2,3-benzotriazole and derivatives thereof; and bactericides such as triazine and thiazoline And morpholine-based, glutaraldehyde-based and the like, and examples of the antifoaming agent include modified silicone.

The lubricating oil composition of the present invention generally has a viscosity (40 ° C.) of usually 20 to 150 mm ² / s and a total acid value of usually 5 to 40 mg KOH / g. Is preferred.

In the lubricating oil composition of the present invention, the mixing method and addition method of various essential components and various additives are not particularly limited, and can be carried out by various methods. It can be performed in various mixing and addition orders.

The lubricating oil composition of the present invention is used as an oil-in-water emulsion. The oil-in-water emulsion is prepared by mixing a lubricating oil composition with water and emulsifying the mixture.

The concentration of the oil component in the oil-in-water emulsion is preferably from 2 to 20% by volume, particularly preferably from 4 to 15% by volume. If the oil content is too small, the lubricity decreases, and if the oil content is too large, it is difficult to bite the rolled material,
In some cases, the cooling of the rolls to be kept at 0 ° C. is not sufficiently cooled.

The oil-in-water emulsion can be prepared by various methods of a conventional emulsion preparation method. For example, a method in which a lubricating oil composition is gradually added to water and then circulated by a pump to prepare the emulsion. No. The circulation condition of the pump is not particularly limited.

[0032]

Next, the present invention will be described more specifically with reference examples, examples and comparative examples. The present invention is not limited by these examples. (A) Various compounds used in Examples and Comparative Examples are shown below.

(A) Component (base oil) As the base oil, a mineral oil having a viscosity of 30 mm ² / s at 40 ° C was used. Lard oil having a viscosity of 40 mm ² / s at 40 ° C. was used as the fat.

(B) Component (Nonionic emulsifier) As a nonionic emulsifier, polyoxyethylene monooleate was used.

(C) Component (fatty acid) As the fatty acid, oleic acid having 18 carbon atoms was used.

(D) Component As the component (d), one produced by the method described in Reference Examples 1 to 9 below was used.

Reference Examples 1 to 3 The component (d) used in Examples and Comparative Examples was obtained as follows. Carboxyethylthiosuccinic acid and the following amine compound were sufficiently mixed at room temperature at the following mixing ratio (mass) to prepare an amine salt of carboxyethylthiosuccinic acid to obtain d-1 to d-3.

[0038] Reference Example Raw material Product 1 Karuho Bu carboxyethyl thio succinic acid 5 parts Triethanolamine 5 parts d-1 2 Karuho Bu carboxyethyl thio succinic acid 5 parts Bu ethanolamine 4 parts d-2 3 Karuho Bu carboxyethyl thio succinic acid 5 parts Monoethanolamine 3 parts d-3

The above d-1, d-2, and d-3 correspond to d-1, d-2, and d-3 in Examples and Comparative Examples described later. This relationship is the same in the following.

Reference Examples 4 to 6 The component (d) used in Examples and Comparative Examples was obtained as follows. Mono-2-ethylhexylamide of carboxyethylthiosuccinic acid and the following amine compound are sufficiently mixed at room temperature at the following mixing ratio (mass) to obtain an amine salt of mono-2-ethylhexylamide of carboxyethylthiosuccinic acid. It prepared and d-4-6 was obtained.

[0041] Reference Example Raw material Product 4 Karuho Bu carboxyethyl mono-2-ethylhexyl amine preparative Bu 5 parts mono-2-ethylhexyl amine preparative Bu 5 parts Bu ethanolamine 4 parts of triethanolamine, 5 parts d-4 5 Karuho Bu carboxyethyl thio succinic thio succinic acid d-5 6 Mono-2-ethylhexyl amide of carboxyethylthiosuccinic acid 5 parts Monoethanolamine 3 parts d-6

Reference Examples 7 to 9 The component (d) used in Examples and Comparative Examples was obtained as follows. 2-Benzothiazolethiosuccinic acid and the following amine compound are sufficiently mixed at the following mixing ratio (mass) at room temperature to prepare an amine salt of 2-benzothiazolethiosuccinic acid to obtain d-7 to 9. Was.

[0043] Reference Example raw material product 7 2-benzo Chiaso Bu Ruchiokohaku acid 5 parts Triethanolamine 5 parts d-7 8 2-benzo Chiaso Bu Ruchiokohaku acid 5 parts Bu ethanolamine 4 parts d-8 9 2-benzo Chiaso Bu Ruchiokohaku Acid 5 parts Monoethanolamine 3 parts d-9

The pH when each of the amine salts d-1 to 9 prepared in Reference Examples 1 to 9 was converted to an 8% aqueous solution was as follows:
It was confirmed that each was in the range of about 7-9.

(E) Component (alkanolamine) Triethanolamine, diethanolamine and monoethanolamine were used as alkanolamines.

Other Additives As an extreme pressure agent, tricresyl phosphate was used.
Modified silicone was used as an antifoaming agent.

(B) Method for preparing emulsion The method for preparing an oil-in-water emulsion is as follows.
Liter), 3.2 kg of the lubricating oil composition was gradually added, and then the temperature was maintained at 40 ° C. and the mixture was circulated by a pump for 24 hours. The circulation condition of the pump is as follows: circulation amount 70 l / mi
n to give an 8% emulsion.

(C) Evaluation Method Using the above-described 8% oil-in-water emulsion, a rolling experiment was carried out with the apparatus schematically shown in FIG. 1 under the following rolling conditions.
The surface of the aluminum plate after the rolling was observed, and the rollability and white rust prevention were evaluated.

In the drawing, 1 is an aluminum plate, 2 and 2 'are backup rolls, 3 is an upper work roll, 3' is a lower work roll, 4, 4 'are air wipers, and 5, 5'.
Denotes a roll for supporting the aluminum plate, and 6, 6 'denote supply positions of the lubricating oil. The air wiper is a facility for removing the lubricating oil adhering to the rolled plate after the rolling by blowing compressed air.

Rolling Conditions Backup Roll Dimension: φ152 mm × W200 mm Material: SUJ2 Hardness: HS91 Work Roll Dimension: φ65 mm × W200 mm Material: SUJ2 Hardness: Upper Roll; HS91 Lower Roll; HS91 Surface Roughness: Ra = 0.16 μm Rmax = 1.56μm Rz = 1.28μm Lower roll; Ra = 0.18μm Rmax = 2.30μm Rz = 1.80μm Above, Ra is arithmetic average roughness, Rmax is maximum roughness, and Rz is ten point average roughness. These are factors that affect the finish of the rolled sheet. Rolling speed: 100 m / min Reduction rate: 40% Tension: Inlet; 1.25 kg / cm ² Outlet; 3.00 kg / cm ² Rolled aluminum material Dimensions: W75 mm × T0.5 mm coil Material: A1050H Lubricating oil: 8 % Emulsion tank capacity: 40L 4.8L / min

"Condition 1" in Tables 1 to 6 below is a case where no air wiper was used, and "Condition 2" means a case where an air wiper was used.

(1) Rollability Immediately after the rolling test, the aluminum test coil was unwound and the surface condition of the plate was observed. Rating ○: Good surface quality without damage such as seizure on the aluminum surface after rolling. ×: Damage such as seizure was observed on the aluminum surface after rolling, and the surface quality was poor.

(2) White Rust Prevention After the rolling test, the aluminum test coil was left in the laboratory for one week, and then the aluminum test coil was unwound and the state of white rust on the surface was observed. Rating ：: No rust was generated. Δ: A small amount of rust is observed. ×: Many rusts are observed.

Examples 1 to 10 The above components (a), (b), (c) and (d)
Using the components and other additives, lubricating oil compositions were prepared at the mixing ratios (% by mass) shown in Tables 1 to 3. The viscosity of the obtained lubricating oil composition is 25 to 35 mm ² / s (40 ° C.)
Met. Further, the obtained lubricating oil composition was converted into an 8% emulsion by the above-mentioned method for preparing an emulsion, and using it, aluminum was rolled under the above-described conditions to evaluate the rollability and white rust prevention. The results are shown in the lower part of the table.

[0055]

[Table 1]

[0056]

[Table 2]

[0057]

[Table 3]

Comparative Examples 1 to 5 The above-mentioned components (a), (b), (c) and (d)
Using the components and other additives, a lubricating oil composition was prepared at the mixing ratio (% by mass) shown in Table 4, and the obtained lubricating oil composition was converted into an 8% emulsion by the above-mentioned emulsion preparation method. An evaluation test was performed under the conditions described above. The results are shown in the lower part of the table.

[0059]

[Table 4]

Examples 11 to 15 The above components (a), (c), (d) and (e)
Using the components and other additives, lubricating oil compositions were prepared at the mixing ratios (% by mass) shown in Table 5. The viscosity of the obtained lubricating oil composition was 25 to 35 mm ² / s (40 ° C.). Further, the obtained lubricating oil composition was made into an 8% emulsion by the above-mentioned emulsion preparation method, and an evaluation test was conducted under the above-mentioned conditions. The results are shown in the lower part of the table.

[0061]

[Table 5]

Comparative Examples 6 to 10 The above components (a), (c), (d) and (e)
Using the components and other additives, lubricating oil compositions were prepared at the mixing ratios (% by mass) shown in Table 6. The obtained lubricating oil composition was made into an 8% emulsion by the above-mentioned emulsion preparation method, and an evaluation test was conducted under the above-mentioned conditions. The results are shown in the lower part of the table.

[0063]

[Table 6]

[0064]

Industrial Applicability The lubricating oil composition of the present invention retains the cooling property and flame retardancy characteristic of an aqueous emulsion and is excellent in both rollability and white rust prevention performance when used for cold rolling of aluminum. ing. Therefore, the oil-in-water emulsion is
By using for cold rolling of aluminum and aluminum alloy, a processed product excellent in surface quality, for example, a rolled aluminum and aluminum alloy plate can be obtained. The present invention is extremely useful in practice.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of an apparatus used for a rolling test of an example and a comparative example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Aluminum plate 2, 2 'Backup roll 3, 3' Work roll 4, 4 'Air wiper 5, 5' Aluminum plate support roll 6, 6 'Lubricating oil supply position

Continuing from the front page (72) Inventor Teruaki Onishi 1134-2 Gongendo, Satte City, Saitama Prefecture Cosmo Research Institute R & D Center

Claims (6)

[Claims] 1. (a) 15 to 99.48 mass% of one or more kinds selected from mineral oil, fat or oil, or synthetic oil,
(B) 0.01 to 25% by mass of a nonionic emulsifier,
(C) 0.5 to 50% by mass of a fatty acid, and (d) amine salt of carboxyethylthiosuccinic acid, amine salt of monoalkylamide compound of carboxyethylthiosuccinic acid or amine of 2-benzothiazolethiosuccinic acid A lubricating oil composition for cold rolling of aluminum or an aluminum alloy, comprising one or more selected from salts at a ratio of 0.01 to 10% by mass. 2. The fatty acid of component (c) has 10 to 2 carbon atoms.
2. The composition of claim 1 which is a fatty acid of 2. 3. The composition according to claim 1, wherein the amine salt of the component (d) is an alkanolamine salt. 4. (a) 15 to 99.48% by mass of one or more kinds selected from mineral oils, fats and oils or synthetic oils,
(C) 0.5 to 50% by mass of a fatty acid, and (d) an amine salt of carboxyethylthiosuccinic acid, an amine salt of a monoalkylamide compound of carboxyethylthiosuccinic acid or an amine salt of 2-benzothiazolethiosuccinic acid. One to two or more selected from 0.01 to 10% by mass, and
(E) A lubricating oil composition for cold rolling of aluminum or an aluminum alloy, comprising an alkanolamine in a ratio of 0.01 to 25% by mass. 5. The method according to claim 1, wherein the fatty acid of component (c) has 10 to 2 carbon atoms.
The composition of claim 4 which is a fatty acid of 2. 6. The composition according to claim 4, wherein the amine salt of the component (d) is an alkanolamine salt.