JP2003096481A - Lubricating oil composition for aluminum processing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a lubricating oil composition which does not pollute a working environment and can endure aluminum processing at a high speed and a high processing rate. SOLUTION: This lubricating oil composition for aluminum processing comprises (A) a mineral oil having <=10 vol.% aromatic component, (B) a 6-40C straight-chain olefin and (C) an oily agent.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a lubricating oil composition for processing aluminum (including aluminum alloys, the same applies hereinafter). Specifically, aluminum rolling (for example, cold rolling), aluminum drawing, aluminum ironing,
The present invention relates to a lubricating oil composition used for drawing aluminum, pressing aluminum and the like.

[0002]

2. Description of the Related Art In the processing of aluminum, it is necessary to process aluminum at a higher speed and a higher processing rate in order to improve productivity.

When machining at high speed and high machining rate,
Lubricant mist is likely to occur. Since the processing is usually performed in an open system, when a conventionally used mineral oil-based lubricating oil is used, the mist contains a large amount of aromatic compounds that cause odors. Significantly worse. Therefore, it is desired to use a low aromatic base oil in consideration of the working environment. However, when using a low-aromatic base oil considering the working environment,
It was found that, compared with the case of using the conventional base oil, the lubricity was adversely affected, the rolling load was increased, and the maximum reduction ratio capable of rolling, that is, the limit reduction ratio was decreased.

As measures against such problems, measures such as increasing the amount of the oily agent in the lubricating oil, in particular, increasing the amount of fatty acid added, and adding alkylbenzene to the lubricating oil have been taken. However, the increase in the amount of the oiliness agent causes problems such as the occurrence of slip and the increase in the amount of wear debris generated under relatively mild rolling conditions. Moreover, the addition of alkylbenzene leads to an increase in cost.

[0005]

The present invention has been completed in view of the above circumstances, and an object thereof is to endure aluminum machining at a high speed and a high machining rate without deteriorating the working environment. To provide a lubricating oil composition.

[0006]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventors have found that the combination of specific components does not deteriorate the working environment, and the high speed and high processing rate. It was found that a lubricating oil composition capable of withstanding aluminum processing in the above was obtained, and the present invention was completed.

That is, according to the present invention, (A) aromatic content is 10
The present invention relates to a lubricating oil composition for aluminum processing, which comprises a mineral oil in an amount of not more than% by volume, (B) a linear olefin having 6 to 40 carbon atoms, and (C) an oiliness agent.

The lubricating oil composition of the present invention is particularly suitable for use in the rolling of aluminum, especially the cold rolling of aluminum.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below.
The component (A) (base oil) of the lubricating oil composition of the present invention is a mineral oil having an aromatic content of 10% by volume or less. In the component (A) of the lubricating oil composition of the present invention, it is necessary that the aromatic content is 10% by volume or less, preferably 8% by volume or less, more preferably 6% by volume or less, from the viewpoint of working environment. is there. Aromatic content here means JIS K 2536 "Petroleum products-
It means a value that is measured by applying the fluorescent indicator adsorption method of "hydrocarbon type test method".

In the component (A) of the lubricating oil composition of the present invention, the naphthene content is not limited, but it is possible to increase the seizure resistance limit at the time of rolling at a high processing rate of aluminum.
It is desirable that the content is 0% by volume or more, preferably 25% by volume or more, more preferably 30% by volume or more. Further, it is desirable that the naphthene content is 90% by volume or less, preferably 85% by volume or less, and more preferably 80% by volume or less because the coefficient of friction of aluminum at a low working rate can be reduced.

In the component (A) of the lubricating oil composition of the present invention, the paraffin content is not limited, but it is 5% by volume or more, preferably 10% by volume because the friction coefficient at low working ratio of aluminum can be lowered. As described above, more preferably 15% by volume or more. Further, it is desirable that the content is 80% by volume or less, preferably 75% by volume or less, and more preferably 70% by volume or less because the seizure resistance limit at the time of high-working-rate rolling of aluminum can be increased.

In the present invention, the naphthene content and the paraffin content are used to determine their proportion based on the molecular ion intensity obtained by mass spectrometry by FI ionization (using a glass reservoir). The measuring method will be specifically described below. An adsorption tube for elution chromatography having a diameter of 18 mm and a length of 980 mm is filled with 120 g of silica gel having a nominal diameter of 74 to 149 μm (grade 923 manufactured by Fuji Devison Chemical Co., Ltd.) activated by drying at about 175 ° C. for 3 hours. Inject 75 ml of n-pentane and pre-wet the silica gel. About 2 g of a sample is precisely weighed, diluted with an equal volume of n-pentane, and the resulting sample solution is injected. When the liquid surface of the sample solution reached the upper end of silica gel, 140 ml of n-pentane was added to separate saturated hydrocarbon components.
Is injected and the eluate is collected from the lower end of the adsorption tube. The eluate of (1) is applied to a rotary evaporator to remove the solvent and obtain a saturated hydrocarbon component. Type analysis is performed on the saturated hydrocarbon component obtained in step 1 by a mass spectrometer. As the ionization method in mass spectrometry,
FI ionization method using a glass reservoir is used,
As the mass spectrometer, JMS-AX505H manufactured by JEOL Ltd. is used.

The measurement conditions are shown below. Accelerating voltage: 3.0kV Cathode voltage: -5 to -6 kV Resolution: about 500 Emitter: Carbon Emitter current: 5mA Measuring range: Mass number 35-700 Auxiliary oven temperature: 300 ° C Separator temperature: 300 ℃ Main oven temperature: 350 ℃ Sample injection volume: 1 μl

Molecular weight obtained by mass spectrometry
On indicates paraffins based on the mass number after isotope correction.
(C_n H_{2n + 2}) And naphthenes (C_n H_2n, C_n H_2n-2,
C_n H _2n-4・ ・ ・) Are classified and organized into two types.
Calculate the ionic strength fraction for all saturated hydrocarbon components
The content of each type is determined. Then obtained in
The entire sample based on the saturated hydrocarbon content.
Determine each content of paraffin and naphthene.

Details of data processing by the type analysis method of FI mass spectrometry are described in "Nisseki Review" Vol. 33, No. 4
No. 135-142, particularly in the section "2.2.3 Data Processing".

The kinematic viscosity of the component (A) of the lubricating oil composition of the present invention is not particularly limited, but the kinematic viscosity at 40 ° C. is 1 to
It is desirable that the range is 6 mm ² / s.

If the kinematic viscosity (40 ° C.) of the component (A) is too low, there is a risk that the risk of fire due to ignition will increase. On the other hand, if it is too high, seizure of the lubricating oil component called stain may easily occur after annealing,
There is a possibility that surface damage called oil pits will occur on the surface of the work material and the surface gloss will deteriorate, slip due to overlubrication will occur, the amount of abrasion powder will increase, scratches on the work material surface, slip will occur Since it becomes impossible to process in a remarkable case, it is preferably 6 mm ² / s or less, more preferably 5.5 mm ² / s or less.

As an example of the mineral oil base oil which can be used as the component (A) of the present invention, the crude oil is subjected to solvent distillation with respect to the lubricating oil fraction obtained by atmospheric distillation and, if necessary, vacuum distillation. Gravel, solvent extraction, hydrocracking, solvent dewaxing, catalytic dewaxing,
Examples thereof include paraffinic mineral oil, naphthenic mineral oil, and mixtures thereof obtained by appropriately combining one or more refining means such as hydrorefining, sulfuric acid washing, and clay treatment. (A) of the lubricating oil composition of the present invention
The above-mentioned oil may be used alone as a component, or 2
You may use it in combination of 2 or more types.

The content of the component (A) contained in the lubricating oil composition of the present invention is arbitrary, but from the viewpoint of working environment, the lower limit value is preferably 60% by mass or more, and 65% by mass based on the total amount of the composition. The above is more preferable, and 70% by mass or more is still more preferable. On the other hand, from the viewpoint of improving the lubricity of the composition, the upper limit value is preferably 99% by mass or less, and more preferably 98% by mass or less, based on the total amount of the composition.

The component (B) of the lubricating oil composition of the present invention is a linear olefin having 6 to 40 carbon atoms. A carbon number of less than 6 is not suitable because it has a low flash point, and a carbon number of 8 or more is preferable in consideration of the flash point of an appropriate height.
Those having 10 or more are more preferable, and those having 12 or more are even more preferable. Further, those having a carbon number of more than 40 are not suitable because they become solid and are difficult to use, and it is difficult to mix and dissolve with other components (base oil and additives) and the like. Furthermore, those having a carbon number of more than 40 are not common and are difficult to obtain. Considering such inconvenience,
Those having 30 or less carbon atoms are preferable.

Such a linear olefin may have one double bond or two or more double bonds in the molecule, but it may have a double bond. The one having one is preferable.

The position of the double bond is also not particularly limited, but since the resulting lubricating oil composition is more excellent in lubricity, it has a double bond at the terminal, that is, the above-mentioned linear olefin. Is preferably n-α-olefin.

Specific examples of these linear olefins include 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1
-Icocene or a mixture of two or more thereof.

As these linear olefins, those obtained by various production methods can be used. For example, an ethylene oligomer obtained by polymerizing ethylene by an ordinary means can be used.

Further, as a matter of course, (B) of the present invention
As the component, the linear olefins may be used alone, or two or more kinds of the linear olefins may be mixed and used.

The content of the component (B) contained in the lubricating oil composition of the present invention is arbitrary, but from the viewpoint of improving the lubricity of the composition, the lower limit is preferably 1% by mass or more based on the total amount of the composition. 3 mass% or more is more preferable, and 5 mass% or more is still more preferable. On the other hand, the upper limit is preferably 30 mass% or less based on the total amount of the composition, and 25 mass% from the viewpoint that an effect commensurate with the added amount can be obtained. The following is more preferable, 20% by mass
The following is even more preferable.

The component (C) of the lubricating oil composition of the present invention is an oiliness agent. The component (C) used in the present invention includes those usually used as an oiliness agent for lubricating oil. However, in order to further improve the processability, it is preferable to use at least one compound selected from the following as the component (C). (1) Ester (2) Monohydric alcohol (3) Carboxylic acid

As the above-mentioned (1) ester, the constituent alcohol may be a monohydric alcohol or a polyhydric alcohol, and the carboxylic acid may be a monobasic acid or a polybasic acid.

The monohydric alcohol usually has 1 carbon atom.
-24 are used, and such alcohol may be linear or branched. 1 to 24 carbon atoms
Specific examples of the alcohol include, for example, methanol, ethanol, linear or branched propanol,
Linear or branched butanol, linear or branched octanol, linear or branched nonanol, linear or branched decanol, linear or branched undecanol, linear or branched Dodecanol,
Straight-chain or branched tridecanol, straight-chain or branched tetradecanol, straight-chain or branched pentadecanol, straight-chain or branched hexadecanol,
Linear or branched heptadecanol, linear or branched octadecanol, linear or branched nonadecanol, linear or branched eicosanol, linear or branched heneicosa Mention may be made of norls, linear or branched tricosanols, linear or branched tetracosanols and mixtures thereof.

The polyhydric alcohol is usually 2 to 10
Valence, preferably divalent to hexavalent, is used. 2-10
Specific examples of the polyhydric alcohol include ethylene glycol, diethylene glycol, polyethylene glycol (ethylene glycol 3 to 15 mer), propylene glycol, dipropylene glycol, polypropylene glycol (propylene glycol 3 to 15 mer). 1,3-propanediol, 1,2-propanediol, 1,3-butanediol, 1,4-butanediol, 2-methyl-1,2-propanediol, 2-methyl-1,3-propanediol Dihydric alcohols such as 1,2-pentanediol, 1,3-pentanediol, 1,4-pentanediol, 1,5-pentanediol and neopentyl glycol; glycerin, polyglycerin (glycerin dimer to octamer) , For example diglycerin,
(Triglycerin, tetraglycerin), trimethylolalkane (trimethylolethane, trimethylolpropane, trimethylolbutane, etc.)
Octamer, pentaerythritol and 2- to 4-mer thereof, 1,2,4-butanetriol, 1,3,5-pentanetriol, 1,2,6-hexanetriol,
Polyhydric alcohols such as 1,2,3,4-butane tetrol, sorbitol, sorbitan, sorbitol glycerin condensate, adonitol, arabitol, xylitol, mannitol; xylose, arabinose, ribose, rhamnose, glucose, fructose, galactose, mannose, Examples include sugars such as sorbose, cellobiose, maltose, isomaltose, trehalose, sucrose, and mixtures thereof.

Among these, ethylene glycol, diethylene glycol, polyethylene glycol (ethylene glycol 3- to 10-mer), propylene glycol, dipropylene glycol, polypropylene glycol (propylene glycol 3- to 10-mer), among others,
1,3-propanediol, 2-methyl-1,2-propanediol, 2-methyl-1,3-propanediol, neopentyl glycol, glycerin, diglycerin, triglycerin, trimethylolalkane (trimethylolethane, trimethyol) Methylolpropane, trimethylolbutane, etc.) and their 2- to 4-mer, pentaerythritol, dipentaerythritol, 1,2,4-
Butanetriol, 1,3,5-pentanetriol,
1,2,6-hexanetriol, 1,2,3,4-butane tetrol, sorbitol, sorbitan, sorbitol glycerin condensate, adonitol, arabitol,
Polyhydric alcohols having 2 to 6 valences such as xylitol and mannitol and mixtures thereof are more preferable. More preferred are ethylene glycol, propylene glycol, neopentyl glycol, glycerin, trimethylolethane, trimethylolpropane, pentaerythritol, sorbitan, and mixtures thereof.

The monobasic acid constituting the ester oiliness agent used as the component (C) in the present invention usually has 6 carbon atoms.
The fatty acids of up to 24 may be straight-chain or branched, and may be saturated or unsaturated. Specifically, for example, linear or branched hexanoic 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 octadecanoic acid, linear or branched hydroxyoctadecanoic acid, linear or branched nonadecanoic acid, linear or branched eicosanoic acid, linear Or branched heneicosanoic acid, linear or branched docosanoic acid, linear or branched tricosanoic acid,
Saturated fatty acids such as linear or branched tetracosanoic acid; linear or branched hexenoic acid, linear or branched heptenoic acid, linear or branched octenoic 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 octadecenoic acid, linear or branched hydroxyoctadecene acid,
Linear or branched nonadecenoic acid, linear or branched eicosenoic acid, linear or branched heneicosenoic acid, linear or branched docosenoic acid, linear or branched tricosenoic acid, Unsaturated fatty acids such as linear or branched tetracosenoic acids, and mixtures thereof. Among these, saturated fatty acids having 8 to 20 carbon atoms, unsaturated fatty acids having 8 to 20 carbon atoms, and mixtures thereof are particularly preferable.

Examples of the polybasic acid constituting the ester oiliness agent include dibasic acids having 2 to 16 carbon atoms and trimellitic acid. As the dibasic acid having 2 to 16 carbon atoms,
It may be linear or branched, and 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 octanedioic acid, linear or branched nonanedioic acid, linear or branched Decanedioic acid, linear or branched undecanedioic acid, linear or branched dodecanedioic acid, linear or branched tridecanedioic acid, linear or branched tetradecanedioic acid, direct Chain or branched heptadecanedioic acid,
Linear or branched hexadecanedioic acid; linear or branched hexenedioic acid, linear 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 tridecenedioic acid, linear or branched tetradecenedioic acid, direct Chain or branched heptadecenedioic acid, linear or branched hexadecenedioic acid; and mixtures thereof.

As the ester oiliness agent, ester of monohydric alcohol and monobasic acid ester of polyhydric alcohol and monobasic acid ester of monohydric alcohol and polybasic acid polyhydric alcohol and polybasic acid Ester monohydric alcohol, mixed ester with polyhydric alcohol and polybasic acid mixed ester monohydric alcohol with monobasic acid, mixed ester with polybasic acid monohydric alcohol, mixed with polyhydric alcohol Esters of any combination of alcohol and carboxylic acid such as a mixed ester of a basic acid and a mixture of a polybasic acid can be used, and are not particularly limited.

When a polyhydric alcohol is used as the alcohol component, it indicates a complete ester in which all the hydroxyl groups in the polyhydric alcohol are esterified. When a polybasic acid is used as the carboxylic acid component, a complete ester obtained by esterifying all the carboxyl groups in the polybasic acid may be used,
A partial ester in which a part of the carboxyl group is not esterified and remains as a carboxyl group may be used.

As the ester used as the component (C) of the composition of the present invention, any of the above-mentioned ones can be used. Among them, a monohydric alcohol and a monobasic acid are used because of their excellent processability. Are preferred.

The total carbon number of the ester used as the component (C) of the composition of the present invention is not particularly limited, but an ester having a total carbon number of 7 or more is preferable from the viewpoint of excellent processability improving effect, and 9 The above esters are more preferable, and 1
Most preferred is one or more esters. Further, when the carbon number is too large, the possibility of increasing the occurrence of stain or corrosion increases, so an ester having a total carbon number of 26 or less is preferable, an ester having a total carbon number of 24 or less is more preferable, and an ester having 22 or less is most preferable.

(2) 1 used as the component (C)
Examples of the polyhydric alcohol include the compounds listed as the alcohol constituting the ester (1). A monohydric alcohol having 6 or more carbon atoms is preferable, an alcohol having 8 or more carbon atoms is more preferable, and an alcohol having 10 or more carbon atoms is most preferable in terms of more excellent processability. Further, if the carbon number is too large, the possibility of increasing the occurrence of stain or corrosion increases, so an alcohol having 20 or less carbon atoms is preferable, an alcohol having 18 or less carbon atoms is more preferable, and an alcohol having 16 or less carbon atoms is preferable. Most preferred.

The (3) carboxylic acid may be a monobasic acid or a polybasic acid. Specifically, for example, the above (1)
The compounds listed as the carboxylic acid constituting the ester can be mentioned. Of these, monovalent carboxylic acids are preferable because they are more processable. Further, from the viewpoint of more excellent processability, a carboxylic acid having 6 or more carbon atoms is preferable, a carboxylic acid having 8 or more carbon atoms is more preferable, and a carboxylic acid having 10 or more carbon atoms is most preferable. Further, if the carbon number is too large, the possibility of increasing the occurrence of stain or corrosion increases. Therefore, a carboxylic acid having 20 or less carbon atoms is preferable, a carboxylic acid having 18 or less carbon atoms is more preferable, and a carboxylic acid having 16 or less carbon atoms is preferable. Carboxylic acids are most preferred.

The component (C) of the lubricating oil composition of the present invention is selected from the above-mentioned various oiliness agents as described above.
Only one kind may be used, or a mixture of two or more kinds may be used, but since the workability can be further improved, (1) 1
Total carbon number of 7 to 2 obtained from polyhydric alcohol and monobasic acid
6 ester, (2) monohydric alcohol having 6 to 20 carbon atoms, (3) monobasic acid having 6 to 20 carbon atoms, and a mixture thereof are preferable.

The total content of the component (C) is arbitrary, but from the viewpoint of processability, the lower limit is 0.1 based on the total amount of the composition.
It may be at least mass%, preferably at least 0.2 mass%, more preferably at least 0.5 mass%. In addition, since the content of too much may increase the occurrence of stains and corrosion, the upper limit of the content is 1 based on the total amount of the composition.
It may be 5% by mass or less, preferably 12% by mass or less, more preferably 10% by mass or less.

The lubricating oil composition of the present invention also contains 40 ° C.
Alkylbenzene having a kinematic viscosity of 1 to 60 mm ² / s may be blended. By using the alkylbenzene together with the component (C), the effect of the component (C) can be further increased.

Alkylbenzene 4 used in the present invention
Kinematic viscosity at 0 ° C is 1 to 60 mm ² Be / s
preferable. Kinematic viscosity at 40 ° C is 1mm² </ S
In some cases, the effect of addition may not be expected. Also,
Kinematic viscosity at 40 ° C is 60 mm² When / s is exceeded
Can increase the occurrence of stains and corrosion,
Preferably 40 mm² / S or less, more preferably 20 m
m² / S or less.

The alkyl group bonded to the benzene ring of the alkylbenzene used in the present invention may be linear or branched, and the number of carbon atoms is not particularly limited. However, an alkyl group having 1 to 40 carbon atoms is preferable.

Specific examples of the alkyl group having 1 to 40 carbon atoms include methyl group, ethyl group, linear or branched propyl group, linear or branched butyl group, linear or Branched pentyl group, straight-chain or branched hexyl group, straight-chain or branched heptyl group, straight-chain or branched octyl group, straight-chain or branched nonyl group, straight-chain or Branched decyl group, linear or branched undecyl group, linear or branched dodecyl group, linear or branched tridecyl group, linear or branched tetradecyl group, linear or Branched pentadecyl group, linear or branched hexadecyl group, linear or branched heptadecyl group, linear or branched octadecyl group, linear or branched nonadecyl group, linear or Branch Icosyl group, straight-chain or branched henicosyl group, straight-chain or branched docosyl group, straight-chain or branched tricosyl group, straight-chain or branched tetracosyl group, straight-chain or branched Pentacosyl group, linear or branched hexacosyl group, linear or branched heptacosyl group, linear or branched octacosyl group, linear or branched nonacosyl group, linear or branched , A straight-chain or branched hentriacontyl group, a straight-chain or branched dotriacontyl group, a straight-chain or branched tritriacontyl group, a straight-chain or branched tetratriacontyl group , Linear or branched pentatriacontyl group, linear or branched hexatriacontyl group, linear or branched heptatriacontyl group , Straight-chain or branched oct triacontyl group, straight or branched nonadecyl triacontyl group include linear or branched tetracontyl group.

The number of alkyl groups in alkylbenzene is usually 1 to 4, but it is 1 from the viewpoint of stability and availability.
Alkylbenzenes having one or two alkyl groups,
That is, monoalkylbenzene, dialkylbenzene,
Alternatively, mixtures of these are most preferably used. The alkylbenzene used may of course be not only an alkylbenzene having a single structure, but also a mixture of alkylbenzenes having different structures.

There is no limitation on the number average molecular weight of the alkylbenzene that can be added to the composition of the present invention.
From the viewpoint of the effect of addition, 100 or more is preferable, and 130 or more is more preferable. Further, if the molecular weight is too large, the possibility of increasing the occurrence of stain or corrosion increases, so the upper limit of the number average molecular weight is preferably 340 or less, 32
0 or less is more preferable.

Any conventional method can be applied to the method for producing the alkylbenzene, and it is not limited at all, but the alkylbenzene can be produced, for example, by the alkylation synthesis method using the following substances.

Specific examples of the aromatic compound as a raw material include benzene, toluene, xylene, ethylbenzene, methylethylbenzene, diethylbenzene, and mixtures thereof. Specific examples of the alkylating agent include lower monoolefins such as ethylene, propylene, butene and isobutylene, preferably 6 to 40 carbon atoms obtained by polymerization of propylene.
Linear or branched olefins; waxes, heavy oils, petroleum fractions, polyethylene, polypropylene and other linear or branched olefins having 6 to 40 carbon atoms; kerosene, gas oil N- from petroleum fractions such as
A linear olefin having 9 to 40 carbon atoms obtained by separating paraffin and subjecting it to olefin conversion with a catalyst; and a mixture thereof can be used.

As the alkylation catalyst for the alkylation, there are Friedel-Crafts type catalysts such as aluminum chloride and zinc chloride; acidic catalysts such as sulfuric acid, phosphoric acid, silicotungstic acid, hydrofluoric acid and activated clay. A known catalyst is used.

The kinematic viscosity at 40 ° C. is 1 to 60 mm ² /
In order to prepare the alkylbenzene of s, for example, an alkylbenzene mixture obtained by the method as exemplified above or a commercially available alkylbenzene mixture is separated by distillation or chromatography to obtain a kinematic viscosity of 1 to 60 mm ² / s.
It is practically convenient to obtain the alkylbenzene fraction of

The lubricating oil composition of the present invention may contain the above-mentioned alkylbenzene in an amount of 0.1 to 50% by mass based on the total amount of the composition. From the viewpoint of the effect of addition, the lower limit of the content is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, and further preferably 1% by mass or more. Further, if the content is too large, the possibility of increasing the occurrence of stains and corrosion increases, so the upper limit value is 50.
It is preferably not more than 40% by mass, more preferably not more than 40% by mass, further preferably not more than 30% by mass.

The lubricating oil composition of the present invention may further contain a synthetic lubricating base oil (synthetic oil), if necessary, in order to further improve its excellent effects. The synthetic oil to be blended here usually has a kinematic viscosity of 0.5 to 5 at 40 ° C.
00mm ² / s, is suitably used especially 0.5 to 30 mm ² / s.

As the synthetic oil, olefins other than the straight-chain olefin (B) (for example, branched olefins such as polybutene and polypropylene), hydrides of these olefins and the like can be used. Particularly, low molecular weight polypropylene, α-olefin oligomer having 8 to 14 carbon atoms, or a mixture thereof is preferable. When these synthetic oils are blended, the odor during use is small, the working environment is improved, and the degreasing property of the surface of the processed product is improved. The blending amount of these synthetic oils is usually 20% by mass or less, and preferably 15% by mass or less, based on the total amount of the composition.

In the lubricating oil composition of the present invention, in order to further improve its excellent effect, an extreme pressure additive, an antioxidant, a rust inhibitor, a corrosion inhibitor, an antifoaming agent, etc. may be added, if necessary. Furthermore, you may add individually or in combination of 2 or more types.

Examples of the extreme pressure additive include phosphorus compounds such as tricresyl phosphate and organic metal compounds such as zinc dialkyldithiophosphate.

Examples of the antioxidant include phenol compounds such as 2,6-ditertiarybutyl-p-cresol (DBPC), aromatic amines such as phenyl-α-naphthylamine, and organometallic compounds such as zinc dialkyldithiophosphate. Can be illustrated.

As the rust preventive, salts of fatty acids such as oleic acid, sulfonates such as dinonylnaphthalene sulfonate, partial esters of polyhydric alcohols such as sorbitan monooleate, amines and their derivatives, phosphates and the like. Examples thereof include derivatives. Benzotriazole etc. are mentioned as a corrosion inhibitor. Examples of the defoaming agent include silicon-based defoaming agents.

The total content of these additives is usually 15
It is desirable that the content is not more than 10% by mass, preferably not more than 10% by mass (all based on the total amount of the composition).

The lubricating oil composition for aluminum processing of the present invention is not particularly limited in its viscosity, but it is generally 40
Those having a kinematic viscosity at 0 ° C. in the range of 0.5 to 500 mm ² / s are preferable, and those in the range of 1 to 200 mm ² / s are more preferable. In particular, when the lubricating oil composition of the present invention is used in the rolling process of aluminum, it is 1 to 10
It is preferably in the range of mm ² / s, 1 to 8 mm
Those in the range of ² / s are more preferable. In the rolling process of aluminum, a lubricating oil composition of 1 mm ² / s or more and 3 mm ² / s or less is used in the case of forming a so-called foil having a thickness of 0.1 mm or less as a viscosity range in which both lubricity and surface quality are compatible. 2 is preferable when forming a so-called strip having a thickness of more than 0.1 mm (more than 0.2 mm).
It is preferably mm ² / s or more and 6 mm ² / s or less.

The lubricating oil composition of the present invention is used for processing aluminum and aluminum alloys, but also for processing various metals such as steel, stainless steel, special steel, copper and copper alloys and alloys of these metals. Can also be used.

The lubricating oil composition of the present invention exerts an excellent effect mainly when used for cold rolling, but is also used for drawing, ironing, drawing and pressing. Further, it can be used for cutting, grinding, etc. other than plastic working.

[0063]

EXAMPLES The contents of the present invention will be described more specifically below with reference to Examples and Comparative Examples, but the present invention is not limited thereto.

Examples 1 to 7 and Comparative Examples 1 to 4 Various lubricating oil compositions having compositions as shown in each example of the table (numerical units of each component represent mass% based on the total amount of the composition) were prepared. Various tests were performed on these compositions by the methods described below. The components (A) to (C) and rolling materials used are as follows.

(A) Component A1: Mineral oil having a kinematic viscosity of 4.8 mm ² / s at 40 ° C. (34% by volume of paraffin, 65% by volume of naphthene, 1% by volume of aromatic) A2: 40 ° C. kinematic viscosity of 1.9 mm ² / s Mineral oil (39% paraffin, 61% naphthene, 0% aromatic)

(B) Component B1: Equal weight mixture of 1-hexadecene and 1-octadecene

(C) Component C1: Lauryl alcohol C2: Butyl stearate C3: Oleic acid

Rolled material a) JIS A-1050 H18 (0.5 mm thickness) b) JIS 1N30 H18 (0.1 mm thickness)

Rollability test 1 Test rolling was performed under the following conditions, and the reduction ratio ((initial thickness of material-remaining thickness of rolled material) / initial thickness of material ×
(100%) was gradually increased to measure the rolling reduction (critical rolling reduction) before seizure or herringbone occurred and rolling became impossible. The results are also shown in the table. Rolling rate: 20% ~ Rolling speed: 100 m / min

Rollability Test 2 Test rolling was performed under the following conditions, the outgoing strip speed of the rolled material was measured, and the advanced rate was calculated as follows. In addition, when the advance rate is a negative value, it indicates that slip has occurred. The results are also shown in the table. Rolling rate: 25% Advanced rate (%): 100 x (output side plate speed-roll peripheral speed) /
Roll speed

[0071]

[Table 1]

[0072]

As described above, as described above,
The lubricating oil composition of the present invention containing the component (C) has the above-mentioned (A).
~ Compared to the lubricating oil composition lacking any of the (C) component,
It has an excellent effect that it can withstand aluminum machining at high speed and high machining rate without deteriorating the working environment. Thus, it can be seen that the lubricating oil composition of the present invention is particularly suitable for use in processing aluminum and aluminum alloys.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C10M 129/26 C10M 129/26 // C10N 20:00 C10N 20:00 Z 30:02 30:02 40: 24 40:24 AF term (reference) 4H104 BA02C BB02C BB04C BB14C BB31C DA02A EA21A LA01 PA23 PA33

Claims (2)

[Claims] 1. A lubricating oil composition for aluminum processing, comprising (A) a mineral oil having an aromatic content of 10% by volume or less, (B) a linear olefin having 6 to 40 carbon atoms, and (C) an oiliness agent. 2. The lubricating oil composition for aluminum processing according to claim 1, which is used for cold rolling of aluminum.