JP2000119679A - Cold rolling oil composition for aluminum foil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cold rolling oil composition capable of standing rolling under a high speed and a high rolling reduction ratio, preventing deterioration in working environment, suppressing generation of abrasion dust and improving qualities of products by incorporating a specific amount of an alkylbenzene and an oily agent into a specific mineral oil and/or a synthetic oil. SOLUTION: Into a base oil comprising a mineral oil and/or a synthetic oil having a kinetic viscosity at 40 deg.C of 1.1-3 mm2/s, preferably 1.2-2.9 mm2/s, an aromatic component content of 20 vol % or less, preferably 10 vol % or less, a naphthene content of 10-900%, preferably 15-85%, and a paraffin content of 10-90%, preferably 15-85%, are incorporated 0.1-50 mass %, preferably 1-40 mass %, of an alkylbenzene having a kinetic viscosity at 40 deg.C of 1-60 mm2/s, preferably 40 mm2/s or less, a number average mol.wt. of 100-340, preferably 130-320 and 0.1-5 mass %, preferably 0.2-5 mass % of at least one oily agent selected from esters, alcohols and carboxylic acids.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a cold rolling oil composition for aluminum foil.

[0002]

2. Description of the Related Art In recent years, in the production of aluminum foil, it is required to perform rolling at a higher speed and a higher reduction rate in order to improve productivity.
However, when rolling is performed at a high speed and a high reduction rate, mist of the rolling oil is likely to be generated. When a conventionally used rolling oil is used, the mist contains a polycyclic aromatic substance which is concerned with carcinogenicity and the like, and there is a problem that the working environment is deteriorated. Further, when aluminum foil is used as a product without annealing after rolling, a small amount of rolling oil remains on the foil surface, but when polycyclic aromatics are contained, the safety of the product may be significantly reduced. Therefore, it is desired to use a low aromatic base oil. Furthermore, when rolling an aluminum foil at a high speed and a high pressure reduction rate, defects of the aluminum foil called pinholes tend to increase. This pinhole is considered to be caused by abrasion powder at the time of rolling. However, when the base oil of the rolling oil is reduced in aromaticity, the generation of the abrasion powder may be significant. In addition, since aluminum foil produced by rolling is used for foods and pharmaceuticals, cleanliness of its surface is strongly required. However, when the amount of the oil agent is increased in order to improve the rolling property at a high speed and a high pressure reduction rate,
Usually, stains are generated during annealing, and in the case of non-annealing, the quality of the product is usually impaired because oily agent components easily remain or cause corrosion. Therefore, there is a need for a rolling oil that exhibits good rolling properties even when the amount of the oil agent is reduced. Furthermore, it was found that when the base oil of the rolling oil was reduced in aromaticity, the effect of adding the oil agent was reduced. The present invention has been made in view of such circumstances, and its purpose is a rolling oil that can withstand rolling at a high speed and high reduction rate, and suppresses the deterioration of the working environment and the generation of wear powder, Another object of the present invention is to provide a cold rolling oil for aluminum foil that can further improve the quality of a product.

[0003]

Means for Solving the Problems The present inventors have found that all of the above-mentioned problems can be solved by blending a specific base oil with a specific amount of an alkylbenzene having a specific kinematic viscosity and a specific amount of an oil agent, The present invention has been completed. That is, the cold rolling oil composition for an aluminum foil of the present invention has a kinematic viscosity at 40 ° C. of 1 to 60 mm ² / s based on a mineral oil and / or a synthetic oil having an aromatic component of 20% by volume or less. Alkylbenzene is contained in an amount of 0.1 to 50% by mass based on the total amount of the composition, and an oil agent is contained in an amount of 0.1 to 50% by mass based on the total amount of the composition.
5% by mass.

[0004]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the contents of the present invention will be described in more detail. The base oil of the rolling oil of the present invention has an aromatic component of 2%.
0% by volume or less of mineral oil and / or synthetic oil. The mineral oil having an aromatic component of 20% by volume or less is not particularly limited in its production method, but a lubricating oil fraction obtained by atmospheric distillation and vacuum distillation of paraffinic, naphthenic or mixed crude oil. Solvent removal, solvent extraction, hydrocracking,
One obtained by appropriately combining one or more kinds of purification means such as solvent dewaxing, contact dewaxing, hydrorefining, sulfuric acid washing, and clay treatment, or those obtained by subjecting them to low aromatic treatment, etc. No. When mineral oil is used as the base oil of the rolling oil of the present invention, the aromatic component is 20% by volume or less, preferably 10% by volume or less, more preferably 5% by volume or less, and most preferably 2% by volume or less. It is necessary. When there are many aromatic components, there is a possibility that the working environment will be degraded or the quality of the product will be degraded. In the present invention,
The aromatic component refers to a value measured by applying the fluorescent indicator adsorption method of JIS K 2536 “Petroleum products-hydrocarbon type test method”. Further, the naphthene content by mass spectrometry described below is 10 to 90%, preferably 15 to 85%.
%, More preferably 20 to 80%. The paraffin content by mass spectrometry described below is desirably 10 to 90%, preferably 15 to 85%, and more preferably 20 to 80%. The ratios of the naphthene component and the paraffin component are determined based on the molecular ion intensities obtained by mass spectrometry using FI ionization (using a glass reservoir). The measurement method is 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 (grade 923, manufactured by Fuji Devison Chemical Co., Ltd.) activated at about 175 ° C. for 3 hours and dried 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 obtained sample solution is injected. When the liquid level of the sample solution reaches the upper end of silica gel, 140 ml of n-pentane is used to separate saturated hydrocarbon components.
And collect the eluate from the lower end of the adsorption tube. The solvent is distilled off from the eluate by a rotary evaporator to obtain a saturated hydrocarbon component. The type analysis of the saturated hydrocarbon component obtained in the above is performed by a mass spectrometer. As an ionization method in mass spectrometry, an FI ionization method using a glass reservoir is used,
The mass spectrometer uses JMS-AX505H manufactured by JEOL Ltd. The measurement conditions are shown below. Acceleration voltage: 3.0 kV Cathode voltage: -5 to -6 kV Resolution: about 500 Emitter: carbon Emitter current: 5 mA Measurement range: Mass number 35 to 700 Sub Oven temperature: 300 ° C Separator temperature: 300 ° C Main Oven temperature: 350 ° C Sample injection amount: 1 μl of molecular ions obtained by mass spectrometry, paraffins (C _n H _{2n + 2} ) were obtained from their mass numbers after isotope correction.
And naphthenes (C _n H _2n , C _n H _2n-2 , C _n H _2n-4 ...)
Classify and organize into types, determine the fraction of each ionic strength, and determine the content of each type with respect to the entire saturated hydrocarbon component. Next, based on the content of the saturated hydrocarbon component obtained in the above, the respective contents of the paraffin component and the naphthene component with respect to the entire sample are determined. For details of data processing by FI method mass spectrometry type analysis, see “Nisseki Review”.
Vol. 33, No. 4, pp. 135-142, particularly “2.2.3
Data processing ”.

[0005] Examples of the synthetic oils include, for example, poly-α-olefins (ethylene-propylene copolymer, polybutene, 1-octene oligomer, 1-decene oligomer, and hydrides thereof), alkylnaphthalene , Monoester (butyl stearate, octyl laurate), diester (ditridecyl glutarate, di-2-ethylhexyl adipate, diisodecyl adipate, ditridecyl adipate, di-2-ethylhexyl sepate, etc.), polyester (trimellitic ester) Etc.), polyol esters (trimethylolpropane caprylate, trimethylolpropaneperargonate, pentaerythritol-2-ethylhexanoate, pentaerythritol pelargonate, etc.), polyoxyalkylenes Call, polyphenyl ether, dialkyl diphenyl ether, phosphate ester (tricresyl phosphate, etc.), fluorine-containing compound (perfluoropolyether, fluorinated polyolefin and the like), silicone oils and the like can be exemplified (however, excluding alkylbenzene).

[0006] As the base oil of the cold-rolling oil composition for aluminum foil of the present invention, the above-described base oil may be used alone or 2
More than one kind may be combined. The base oil used in the present invention is
The viscosity is not particularly limited, but the kinematic viscosity at 40 ° C. is preferably 1.1 mm ² / s or more, and 1.2 mm ² / s, since the danger such as fire due to ignition can be reduced. More preferably,
Most preferably, it is 1.3 mm ² / s or more. On the other hand, if the viscosity is too high, surface damage called oil pits may occur on the aluminum foil and the surface gloss may deteriorate,
The kinematic viscosity at 40 ° C. is 3 m from the viewpoint that the lubricating oil component called “stain” may occur after annealing and that the rolling speed may be difficult to increase.
preferably m is ² / s or less, more preferably at most 2.9 mm ² / s, and most preferably not more than 2.8 mm ² / s

[0007] The alkylbenzene 4 used in the present invention
Kinematic viscosity at 0 ° C is 1 to 60 mm ^Two/ S
is necessary. Kinematic viscosity at 40 ° C is 1mm^TwoLess than / s
In this case, the effect of reducing the generation of wear powder cannot be expected, and
The effect of improving rollability cannot be expected. Also at 40 ° C
Kinematic viscosity is 60mm^Two/ S
And may increase the occurrence of corrosion.
0mm^Two/ S or less, more preferably 20 mm^Two/ S or less
is there. In addition, the base of the alkylbenzene used in the present invention.
The alkyl group bonded to the benzene ring is linear
May also be branched, and the number of carbon atoms is
The alkyl having 1 to 60 carbon atoms is not limited to
Preferably an alkyl group having 1 to 40 carbon atoms
And more preferably an alkyl having 1 to 20 carbon atoms.
Most preferably, it is a hydroxyl group. Al having 1 to 20 carbon atoms
As the kill group, specifically, for example, a methyl group, ethyl
Group, linear or branched propyl group, linear or branched
Butyl group, linear or branched pentyl group, linear or
Is a branched hexyl group, linear or branched heptyl
Group, linear or branched octyl group, linear or branched
A nonyl group, a linear or branched decyl group, a 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
Branched heptadecyl group, linear or branched octadecyl group
Group, linear or branched nonadecyl group, linear or branched
Examples include a branched icosyl group. In alkylbenzene
The number of the alkyl group is usually 1 to 4, stability,
Has one or two alkyl groups from the viewpoint of availability
Alkylbenzene, i.e., monoalkylbenzene, dialkyl
Alkylbenzene, or a mixture thereof, is most preferred.
Used. In addition, as alkylbenzene,
Not only a single structure alkylbenzene, but also different
It can be a mixture of alkylbenzenes having a structure
No. Number average molecule of alkylbenzene used in the present invention
There is no restriction on the amount, but the generation of abrasion powder is reduced.
In view of the effect and the effect of improving the rolling property, 100 or more is preferable.
And 130 or more is more preferable. Also, stains and rot
Because the likelihood of increasing the occurrence of food is greater,
The average molecular weight is preferably 340 or less, more preferably 320 or less.
preferable. The above alkylbenzene production method is optional.
The following methods can be applied and are limited
No, but for example, alkylation synthesis using the substances shown below
It can be manufactured by a method or the like. Aromatic raw material
As the compound, specifically, for example, benzene, toluene
, Xylene, ethylbenzene, methylethylbenzene
, Diethylbenzene, and mixtures thereof are used.
It is. As the alkylating agent, specifically, for example,
Lower grades such as ethylene, propylene, butene, isobutylene
By polymerization of a monoolefin, preferably propylene
The resulting linear or branched olefin having 6 to 60 carbon atoms
Wax, heavy oil, petroleum fraction, polyethylene, poly
6 to 60 carbon atoms obtained by thermal decomposition of propylene or the like
Linear or branched olefins; petroleum such as kerosene and light oil
The n-paraffin is separated from the fraction, and this is
Having 9 to 60 carbon atoms obtained by refining
Linear olefins; and mixtures thereof can be used.
You. As the alkylation catalyst for the alkylation, salts such as salts
Friedel Crafts type touch of aluminum chloride, zinc chloride, etc.
Medium: sulfuric acid, phosphoric acid, silicotungstic acid, hydrogen fluoride
A known catalyst such as an acid or an acid catalyst such as activated clay is used.
You. The alkylbenzene of the present invention has a kinematic viscosity at 40 ° C.
Is 1 to 60 mm^Two/ S, for example,
Alkylbenzene mixture obtained by such a method
Or commercially available alkylbenzene mixtures by distillation or chromatography.
Separated by mat, kinematic viscosity is 1-60mm^Two/ S
It is practically convenient to obtain an alkylbenzene fraction
You.

[0008] The cold rolling oil composition for aluminum foil of the present invention comprises:
The above-mentioned alkylbenzene was used in an amount of 0.1% based on the total amount of the composition.
About 50% by mass. The lower limit of the content is
From the viewpoint of suppressing the generation of abrasion powder that causes pinholes, and from the viewpoint of the effect of improving the rollability, it is necessary that the content be 0.1% by mass or more, and 0.5% by mass or more. More preferably, it is 1% by mass or more. Further, the upper limit of the content is required to be 50% by mass or less, and is preferably 40% by mass or less, since the possibility of increasing the occurrence of stain and corrosion during annealing increases. It is more preferable that the content is not more than mass%.

As the oil agent in the present invention, any agent can be used, but since it is possible to further improve the rolling property, it is desirable to mix at least one oil agent selected from the following. . (1) Ester (2) Alcohol (3) Carboxylic acid As the above (1) ester, the constituent alcohol is 1
The polyhydric alcohol or polyhydric alcohol may be used, and the carboxylic acid may be a monobasic acid or a polybasic acid. As the monohydric alcohol, one having 1 to 24 carbon atoms is usually used, and such an alcohol may be linear or branched. As the alcohol having 1 to 24 carbon atoms, specifically, for example, methanol, ethanol, linear or branched propanol, linear or branched butanol, linear or branched octanol, linear Or branched nonanol, linear or branched decanol, linear or branched undecanol, linear or branched dodecanol, linear or branched tridecanol, linear or branched tetradecanol Decanol, linear or branched pentadecanol, linear or branched hexadecanol, linear or branched heptadecanol, linear or branched octadecanol, linear Or branched nonadecanol, straight or branched eicosanol, straight or branched hen eicosanol, straight or branched tricosanol, straight or branched And the like in tetracosanol, and mixtures thereof. The polyhydric alcohol is generally divalent to 10-valent, preferably 2
Those having a valence of 6 to 6 are used. Specific examples of the di- to polyhydric alcohols include, for example, ethylene glycol, diethylene glycol, polyethylene glycol (3 to 15 mer of ethylene glycol), propylene glycol, dipropylene glycol, and polypropylene glycol (3 to 15 of propylene glycol). Monomer), 1,3-
Propanediol, 1,2-propanediol, 1,3
-Butanediol, 1,4-butanediol, 2-methyl-1,2-propanediol, 2-methyl-1,3-
Propanediol, 1,2-pentanediol, 1,3
-Pentanediol, 1,4-pentanediol, 1,
2 such as 5-pentanediol and neopentyl glycol
Polyhydric alcohols; glycerin, polyglycerin (2 to octamer of glycerin, such as diglycerin, triglycerin, tetraglycerin, etc.), trimethylolalkane (trimethylolethane, trimethylolpropane, trimethylolbutane, etc.) and these 2 to 2 Octamer, pentaerythritol and their dimers and tetramers, 1,2,4
-Butanetriol, 1,3,5-pentanetriol, 1,2,6-hexanetriol, 1,2,3,4
Polyhydric alcohols such as butanetetrol, sorbitol, sorbitan, sorbitol glycerin condensate, adonitol, arabitol, xylitol, mannitol;
Xylose, arabinose, ribose, rhamnose, glucose, fructose, galactose, mannose,
Examples thereof include saccharides such as sorbose, cellobiose, maltose, isomaltose, trehalose, and sucrose, and mixtures thereof. Among these, ethylene glycol, diethylene glycol, polyethylene glycol (3-10 mer of ethylene glycol), propylene glycol, dipropylene glycol, polypropylene glycol (3-10 mer of propylene glycol), 1,3-propanediol, 2-methyl-1,2
-Propanediol, 2-methyl-1,3-propanediol, neopentyl glycol, glycerin, diglycerin, triglycerin, trimethylolalkane (trimethylolethane, trimethylolpropane, trimethylolbutane, etc.) and their 2-4 Dimer, pentaerythritol, dipentaerythritol 1,2,4-butanetriol, 1,3,5-pentanetriol,
1,2,6-hexanetriol, 1,2,3,4-butanetetrol, sorbitol, sorbitan, sorbitol glycerin condensate, adonitol, arabitol,
Divalent to hexavalent polyhydric alcohols such as xylitol and mannitol, and mixtures thereof are more preferred. More preferably, ethylene glycol, propylene glycol,
Neopentyl glycol, glycerin, trimethylolethane, trimethylolpropane, pentaerythritol, sorbitan, and mixtures thereof.

The monobasic acid is usually a fatty acid having 6 to 24 carbon atoms, which may be linear 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, linear or branched tetracosanoic acid Such as saturated fatty acids, linear or branched hexenoic acid, linear or branched heptenic 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, straight Jo or branched hexadecene acid,
Linear or branched octadecenoic acid, linear or branched hydroxyoctadecenoic acid, linear or branched nonadecenoic acid, linear or branched eicosenoic acid, linear or branched heneicosene Unsaturated fatty acids such as acid, linear or branched docosenoic acid, linear or branched tricosenoic acid, linear or branched tetracosenoic acid, and mixtures thereof. Among them, especially those having 8 carbon atoms
Preferred are saturated fatty acids having up to 20 or unsaturated fatty acids having 8 to 20 carbon atoms, and mixtures thereof. Examples of the polybasic acid include dibasic acids having 2 to 16 carbon atoms and trimellitic acid. The dibasic acid having 2 to 16 carbon atoms may be linear or branched, and may be saturated or unsaturated. Specifically, for example, ethanedioic acid, propanedioic acid, linear or branched butanedioic acid, linear or branched pentanedioic acid, linear or branched hexanedioic acid, linear Or a branched or octane diacid, a straight or branched nonanedioic acid, a straight or branched decane diacid, a straight or branched undecandioic acid, a straight or branched dodecane diacid Acid, linear or branched tridecandioic acid, linear or branched tetradecandioic acid, linear or branched heptadecandioic acid, linear or branched hexadecandioic 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 tetradecene diacid, linear or branched heptadecenoic acid,
Examples include linear or branched hexadecenedioic acids and mixtures thereof.

[0011] Further, as a combination of an alcohol and a carboxylic acid, an ester of a monohydric alcohol and a monobasic acid, an ester of a polyhydric alcohol and a monobasic acid, an ester of a monohydric alcohol and a polybasic acid, Ester with basic acid Monoester, mixed ester with polyhydric alcohol and mixed ester with polybasic acid Polyester with monobasic acid, mixed ester with polybasic acid and mixed ester Monohydric alcohol, polyhydric alcohol Any combination, such as a mixed ester of a mixture with a monobasic acid or a polybasic acid, is possible. When a polyhydric alcohol is used as the alcohol component, a complete ester in which all of the hydroxyl groups in the polyhydric alcohol are esterified may be used, or a partial ester in which some of the hydroxyl groups remain unesterified and remain as hydroxyl groups may be used. . When a polybasic acid is used as the carboxylic acid component, the carboxyl group in the polybasic acid may be a complete ester in which all the carboxyl groups are esterified,
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 in the present invention, any of the above-mentioned esters can be used. Among them, an ester of a monohydric alcohol and a monobasic acid is preferred from the viewpoint of more excellent effect of improving the rolling property. The total carbon number of the ester used as the oil agent in the present invention is not particularly limited, but an ester having a total carbon number of 7 or more is preferable, an ester of 9 or more is more preferable, and an ester having an excellent effect of improving the rolling property is 11 or more. The above esters are most preferred. Further, 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 a total of 22 or less is most preferable since the possibility of increasing the occurrence of stain and corrosion increases.

The alcohol (2) may be a monohydric alcohol or a polyhydric alcohol. Specifically, for example, the compounds listed as (1) the alcohol constituting the ester are mentioned. Of these, monohydric alcohols are preferred because they are more excellent in the effect of improving the rollability. In addition, alcohols having 6 or more carbon atoms are preferable, alcohols having 8 or more carbon atoms are more preferable, and alcohols having 10 or more carbon atoms are most preferable from the viewpoint of more excellent rolling effect. In addition, alcohols having 20 or less carbon atoms are preferable, alcohols having 18 or less carbon atoms are more preferable, and alcohols having 16 or less carbon atoms are most preferable because the possibility of increasing the occurrence of stain and corrosion is increased.

The carboxylic acid (3) 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 are exemplified. Among these, monovalent carboxylic acids are preferable from the viewpoint of more excellent effect of improving the rolling property. In addition, 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, from the viewpoint of more excellent rollability improving effect.
Further, 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 most preferable, since the possibility of increasing the occurrence of stain and corrosion is increased.

The oily agent of the cold-rolling oil composition for aluminum foil of the present invention is selected from the various oily agents described above.
Although only a seed or a mixture of two or more kinds may be used, the effect of improving the rolling property can be further improved (1).
Total carbon number 7 to 7 obtained from monohydric alcohol and monobasic acid
Preferred are esters of 26, (2) monohydric alcohols having 6 to 20 carbon atoms, (3) monobasic acids having 6 to 20 carbon atoms, and mixtures thereof. Furthermore, by using a dihydric alcohol in combination with these, the effect of improving the rollability can be further improved. The cold-rolling oil composition for aluminum foil of the present invention contains the above-mentioned oily agent in an amount of 0.1 to 5% by mass on the basis of the total amount of the composition (as the total amount of the oily agent). From the point that the lower limit of the content is more excellent in the effect of improving rollability,
It is necessary to be 0.1% by mass or more, preferably 0.2% by mass or more, more preferably 0.5% by mass or more.
Further, the upper limit of the content is required to be 5% by mass or less from the viewpoint of increasing the possibility of increasing the occurrence of stain and corrosion and making it difficult to increase the rolling speed. When an ester is used as the base oil, it is necessary to mix the ester so that the total amount of the ester does not exceed 99.9% by mass based on the total amount of the composition.

In the cold rolling oil composition for aluminum foil of the present invention, if necessary, extreme pressure additives, antioxidants, rust inhibitors, corrosion inhibitors, A foaming agent or the like may be further added alone or in combination of two or more. Examples of the extreme pressure additive include phosphorus compounds such as tricresyl phosphate, and organometallic compounds such as zinc dialkyldithiophosphate.
Examples of the antioxidant include phenolic compounds such as 2,6-di-tert-butyl-p-cresol (DBPC), aromatic amines such as phenyl-α-naphthylamine,
And organometallic compounds such as zinc dialkyldithiophosphate. Examples of the rust inhibitor include salts of fatty acids such as oleic acid, sulfonates such as dinonylnaphthalene sulfonate, partial esters of polyhydric alcohols such as sorbitan monooleate, amines and derivatives thereof, phosphate esters and derivatives thereof, and the like. Can be exemplified. Examples of the corrosion inhibitor include benzotriazole. Examples of the defoaming agent include silicon-based ones. The content of these additives is usually 15% by mass or less, preferably 10% by mass or less (all based on the total amount of the composition; the total amount).

The cold rolling oil composition for aluminum foil of the present invention comprises:
The viscosity is not particularly limited, but the kinematic viscosity at 40 ° C. is preferably 1.1 mm ² / s or more, and 1.2 mm ² / s, since the danger such as fire due to ignition can be reduced. More preferably,
Most preferably, it is 1.3 mm ² / s or more. On the other hand, if the viscosity is too high, surface damage called oil pits may occur on the aluminum foil and the surface gloss may deteriorate,
The kinematic viscosity at 40 ° C. is 3 m from the viewpoint that the lubricating oil component called “stain” may occur after annealing and that the rolling speed may be difficult to increase.
preferably m is ² / s or less, more preferably at most 2.9 mm ² / s, and most preferably not more than 2.8 mm ² / s

[0018]

EXAMPLES Hereinafter, the content of the present invention will be described more specifically with reference to Examples and Comparative Examples, but the present invention is not limited to these.

Various compositions having the compositions shown in Examples 1 to 11, Comparative Examples 1 to 5 and Reference Examples Table 1 were prepared, and these compositions were subjected to various tests by the following methods. Was. The results are shown in Table 1. The used base oil, alkylbenzene, and oiliness agent are as follows. Base oil 140 Kinematic viscosity at 140 ° C .: 1.85 mm ² / s, paraffin content: 63%, naphthene content: 37%, aromatic component: 0% by volume 240 Kinematic viscosity at 40 ° C .: 1.93 mm ² / s, Paraffin content: 48%, naphthene content: 27%, aromatic component: 25% by volume Alkylbenzene 140 Kinematic viscosity at 140 ° C .: 4.3 mm ² / s, number average molecular weight: 242 2 Kinematic viscosity at 40 ° C .: 7.6 mm ² / s, number average molecular weight: 264 3 Kinematic viscosity at 40 ° C .: 68 mm ² / s, number average molecular weight: 346 oily agent 1 n-dodecanol 2 butyl stearate 3 oleic acid

Rolling test 1 Test rolling was performed under the following conditions, and the rolling reduction was gradually increased from 50% until the rolling was impossible due to the occurrence of seizure and herringbone. Table 1 shows the reduction ratio (critical reduction ratio) before seizure or herringbone occurs and rolling becomes impossible. Rolled material: JIS 1N30 H18 0.1mm thickness Rolling reduction: 50% ~ Rolling speed: 100m / min Rolling test 2 Test rolling is performed under the following conditions, and the amount of wear in oil after rolling and adhesion to the foil surface The total amount of wear powder was measured.
Table 1 shows the results. Rolled material: JIS 1N30 H18 0.1mm thickness Rolling reduction: 60% Rolling speed: 150m / min In addition, for abrasion powder in oil, a certain amount of rolling oil after the test is sampled,
The solution was filtered through a 0.1 micron filter, and the supplement was dissolved in an acid, and the aluminum content was measured by an atomic absorption method. The amount of abrasion powder adhering to the foil surface was determined by setting absorbent cotton impregnated with n-hexane on a wiper, sandwiching the foil after rolling, and wiping a fixed length. After the wear powder adhering to the absorbent cotton was dissolved in acid, the aluminum content was measured by an atomic absorption method. Rolled material 1m ^{2 in} oil and foil surface
The amount of aluminum wear powder per unit was determined by calculation, and the total was defined as the amount of wear powder generated when rolling the rolled material by 1 m ² (hereinafter referred to as the amount of wear powder generation). Stain generation test Stain generation was tested based on CanTest described in J. Inst. Metals. 88 (1959) 481. That is, 0.3 ml of the sample oil was dropped into an aluminum cup, the temperature was raised from room temperature to 350 ° C. over 150 minutes, and the temperature was kept at 350 ° C. for 60 minutes, and the sample was taken out and visually evaluated for the generation of stain. ○ indicates that no stain is generated, △ indicates slightly generated, and X indicates that generated entirely.

[0021]

[Table 1]

As is clear from the results shown in Table 1, the compositions according to the present invention (Examples 1 to 11) are all excellent in rollability, generate a small amount of abrasion powder, and do not generate stain. It exhibited the same performance as the conventionally used rolling oil (reference example). On the other hand, Comparative Example 1, which does not contain alkylbenzene, has poor rolling properties and generates a large amount of wear powder. In Comparative Example 2 in which the content of alkylbenzene exceeded the specified value and in Comparative Example 3 in which the content of the oil agent exceeded the specified value, stain was generated on the entire surface. In Comparative Example 4 containing no alkylbenzene and containing the oily agent in excess of the specified value, a large amount of abrasion powder was generated and stain was generated on the entire surface. In Comparative Example 5 containing an alkylbenzene having a too high viscosity, stain was generated on the entire surface.

[0023]

In summary, according to the present invention, an alkylbenzene having a kinematic viscosity at 40 ° C. of 1 to 60 mm ² / s based on a mineral oil and / or a synthetic oil having an aromatic component of 20% by volume or less is used. A rolling oil that can withstand high-speed and high-pressure reduction by containing 0.1 to 50% by mass based on the total amount of the composition and 0.1 to 5% by mass based on the total amount of the oily agent. Further, a cold rolling oil for aluminum foil can be obtained which can suppress the deterioration of the working environment and the generation of abrasion powder and can further improve the quality of the product.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) C10N 30:06 40:24)

Claims (1)

[Claims] 1. A kinematic viscosity at 40 ° C. of 1 based on mineral oil and / or synthetic oil having an aromatic component of 20% by volume or less.
~60mm ² / s alkylbenzene with containing 0.1 to 50 wt% of the total amount of the composition of a cold Aluminum foil, characterized in that it contains 0.1 to 5 wt% of an oily agent of the total amount of the composition Hot rolling oil composition.