JP2002088388A - Method for producing cold rolling oil for aluminum - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing an aluminum cold-rolling oil which can improve a working environment, can enhance the gloss value of the rolled product under severe rolling conditions and also under mild rolling conditions, can control the generation of irregular gloss, and has excellent anti-oxidative performance and excellent oxidation stability. SOLUTION: This method for producing the cold rolling oil for the aluminum is characterized by mixing (1) a base oil having an aromatic content of <=5 vol.% and a sulfur content of <=3 wt. ppm with (2) a base oil having an aromatic content of 10 to 30 vol.% and a sulfur content of 30 to 500 wt.ppm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a cold rolling oil for forming strips (plates) or foils of aluminum (including aluminum alloys, the same applies hereinafter), and more particularly to various rolling conditions. The present invention relates to a method for producing a cold rolling oil for aluminum, which is most suitable for aluminum.

[0002]

2. Description of the Related Art Cold rolling of aluminum is usually performed in an open system. When conventional aluminum cold rolling oil is used for high-speed, high-pressure reduction in order to improve productivity, a large amount of mist of rolling oil is generated in the workplace, which may cause odor or cause a worker's skin The work environment may be remarkably deteriorated, for example, the surface may be roughened by adhering to the surface. Therefore,
Aluminum cold rolling oil is required to have properties that do not impair the working environment.

Further, when rolling aluminum under rolling conditions in a relatively severe lubrication state, depending on the rolling oil used, the aluminum coating formed on the work roll may be enlarged, thereby causing the aluminum after rolling to be enlarged. The surface gloss of the plate is reduced. In addition, seizure or herringbone may occur on aluminum.

On the other hand, a rolling oil that can be used under severe lubrication conditions involves an increase in cost such as an increase in the content of an oily agent, and when the same rolling oil is used under relatively mild lubrication conditions, a work roll may not work. In some cases, slip occurs between the rolled material and the rolled material, and the surface of the aluminum plate after rolling may be damaged. If the slip is extremely severe, the operation may be hindered. Further, the roll coating may be non-uniform, causing uneven gloss in the width direction of the rolled material. In other words, the product after rolling needs to have a high gloss value and no uneven gloss, and if either of them is inferior, it may not be able to be shipped as a product. Therefore, there is a need for a rolling oil that can increase the gloss value of a rolled product and suppress the occurrence of uneven gloss.

[0005] Therefore, there is a need for a rolling oil that can be used under both severe and mild conditions.

[0006] Also, since the use of an antioxidant or an increase in the amount thereof increase the cost, a rolling oil having excellent antioxidant performance is required.

As described above, the rolling oil for aluminum includes:
Various properties are required, but it is difficult to obtain a rolling oil that satisfies all of these properties at the same time.

For this reason, it is conceivable to use different rolling oils depending on rolling conditions, product grades, and the like.
Preparing the rolling oil for each case complicates the work for changing the rolling oil, and is extremely difficult to implement in practice, as the number of tanks for storing the rolling oil is limited. Often difficult.

For example, a rolling oil optimal for rolling conditions in a relatively severe lubricating state and a rolling oil optimal for a rolling condition in a relatively mild lubricating state are prepared. It is possible to cope with various rolling conditions by mixing the above rolling oil, but no satisfactory results have yet been obtained.

[0010] In addition, since rolling oil having poor oxidation stability is liable to cause stains on the rolled material due to seizure of oil on the rolled material during the annealing process after rolling, the oxidation oil is added so that the cost due to the addition of an antioxidant can be minimized. There is a need for oils with excellent stability.

[0011]

SUMMARY OF THE INVENTION It is an object of the present invention to improve the working environment and to be able to use even under severe rolling conditions or mild conditions, that is, to increase the gloss value of a rolled product under any conditions and to generate uneven gloss. It is an object of the present invention to provide a method for producing an aluminum cold-rolling oil which can suppress the occurrence of oxidation and has excellent antioxidant performance and oxidation stability.

[0012]

Means for Solving the Problems The inventors of the present invention have made intensive studies to solve the above-mentioned problems, and as a result, by mixing two specific base oils, the optimum aluminum for various rolling conditions is obtained. It has been found that cold rolling oil can be obtained, and the present invention has been completed.

That is, the present invention relates to a method for producing a cold rolling oil for aluminum, wherein (1) an aromatic content is 5% by volume.
A base oil having a sulfur content of 3 mass ppm or less and a base oil having an aromatic content of 10 vol% to 30 vol% and a sulfur content of 30 mass ppm to 500 mass ppm. It is characterized by.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below.
The base oil used in the method for producing a cold rolling oil for aluminum of the present invention is the following two types. (1) The aromatic content is 5% by volume or less, and the sulfur content is 3 mass p.
pm or less base oil (2) A base oil having an aromatic content of 10% by volume or more and 30% by volume or less and a sulfur content of 30% by mass or more and 500% by mass or less The aromatic component of the base oil of (1) is obtained. When the rolling oil adheres to the worker's skin, the working environment conditions such as hardly causing skin roughness and weak odor are satisfied, so that the content is required to be 5% by volume or less, and 4% by volume or less. It is more preferably at most 3% by volume. As used herein, the term “aromatic component” refers to a value that is determined by applying the fluorescent indicator adsorption method of JIS K 2536 “Petroleum products-hydrocarbon type test method”.

The naphthene and paraffin components of the base oil (1) are not particularly limited, but the following are preferred. Naphthene content: From the viewpoint of improving the surface gloss of aluminum after rolling, preferably 30% by volume or more, more preferably 40% by volume.
% By volume or more, most preferably 50% by volume or more. From the viewpoint of reducing the friction coefficient during high-pressure rolling of aluminum, the volume is preferably 95% by volume or less, more preferably 90% by volume or less, and most preferably 80% by volume or less.

Paraffin content: preferably 10% by volume from the viewpoint of reducing the coefficient of friction during high-pressure rolling of aluminum.
Or more, more preferably 15% by volume or more, most preferably 20% by volume or more. From the viewpoint of improving the surface gloss of aluminum after rolling, it is preferably 50% by volume or less, more preferably 40% by volume or less, and most preferably 30% by volume or less.

In the present invention, the proportions of naphthene and paraffin are determined based on the molecular ion intensity obtained by mass spectrometry using FI ionization (using a glass reservoir). Hereinafter, the measurement method will be specifically described.

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 by drying at about 175 ° C. for 3 hours and having a nominal diameter of 74 to 149 μm. . 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 surface 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 eluate from is subjected to a rotary evaporator to distill off the solvent 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 ionization methods in mass spectrometry,
FI ionization 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 volume: 1 μl of molecular ions obtained by mass spectrometry
After body correction, the paraffins (C_n H_{2n + 2})
And naphthenes (C_n H_2n, C_n H_2n-2, C_n H _2n-4・ ・
・) Categorized and arranged into two types, and the ionic strength of each
Of each type for the entire saturated hydrocarbon component
Determine the content of Then, the saturated hydrocarbon obtained in
Based on the content of components, paraffin
And naphthene content.

The details of the data processing by the FI method mass spectrometry type analysis method are described in “Nisseki Review”, Vol. 33, No. 4,
No. 135-142, in particular, in the section "2.2.3 Data processing".

[0021] The sulfur content of the base oil (1) needs to be 3 mass ppm or less because it satisfies working environment conditions such as hardly causing rough skin even if it adheres to the skin of the worker and low odor. And preferably at most 2 mass ppm, more preferably at most 1.5 mass ppm. The sulfur content referred to in this specification is JIS K2541.
It means the value measured by "Crude oil and petroleum products-Sulfur content test method".

On the other hand, the aromatic component of the base oil (2) can suppress a decrease in the surface gloss of the aluminum plate after rolling due to enlargement of the roll coating even under severe lubricating rolling conditions, and the amount of the oil agent added It is necessary to be 10% by volume or more from the viewpoint that it is not necessary to increase the amount, to be able to suppress damage to the plate surface after rolling due to slip between the work roll and the rolled material, and to be excellent in antioxidant performance. And preferably at least 12% by volume.
More preferably, it is 5% by volume or more.

In addition, since the base oil (2) has an aromatic content of 30% by volume or less, it satisfies working environment conditions such as being less likely to become rough even when it adheres to the worker's skin and having a weak odor. It is necessary, and is preferably 25% by volume or less, more preferably 23% by volume or less.

The naphthene and paraffin components of the base oil (2) are not particularly limited, but the following are preferred. Naphthene content: preferably 30% by volume or more, more preferably 40% by volume, from the viewpoint of improving the gloss of the surface of the aluminum plate (foil) after rolling.
% By volume or more, most preferably 50% by volume or more. From the viewpoint of reducing the friction coefficient during high-pressure reduction rolling of aluminum, preferably 95% by volume or less, more preferably 90% by volume or less,
Most preferably 80% by volume or less.

Paraffin content: From the viewpoint of reducing the coefficient of friction at the time of aluminum high-pressure rolling, the content is preferably 10% by volume or more, more preferably 15% by volume or more, and most preferably 2% by volume or more.
0% by volume or more. From the viewpoint of improving the gloss of the surface of the aluminum plate (foil) after rolling, it is preferably 60% by volume or less, more preferably 55% by volume or less, and most preferably 50% by volume or less.

The sulfur content of the base oil (2) is required to suppress the decrease in the surface gloss of the aluminum plate after rolling due to the enlargement of the roll coating and the like even under severe lubricating rolling conditions, and it is necessary to increase the amount of the oiling agent added. It is necessary that the content be 30 ppm by mass or more, from the viewpoint of excellent antioxidation performance and the like, preferably 40% by mass or more, more preferably 50% by mass or more.

The base oil (2) needs to have a sulfur content of 500 ppm by mass or less because it satisfies working environment conditions such as being less likely to become rough even if it adheres to the skin of the worker and having a weak odor. And it is preferably at most 450 ppm by mass, more preferably at most 400 ppm by mass.

As an example of a mineral base oil which can be used as the base oil (1) or (2) in the present invention, a lubricating oil fraction obtained by subjecting crude oil to atmospheric distillation and, if necessary, vacuum distillation is used. On the other hand, solvent removal, solvent extraction, hydrocracking, solvent dewaxing,
Examples include paraffinic or naphthenic mineral oils obtained by appropriately combining one or more purification means such as catalytic dewaxing, hydrorefining, sulfuric acid washing, and clay treatment. As the base oils (1) and (2), any one of the above base oils may be used alone or in combination of two or more.

In the present invention, the base oil (1) and the base oil (2)
Is appropriately selected according to rolling conditions and the like when aluminum is actually rolled using the obtained rolling oil.
When it is desired to cope with more severe rolling conditions in a lubricated state, specifically in the case of rolling at a high pressure reduction or rolling of a hard material, the mixing amount of the base oil (2) is increased. Conversely, if you want to cope with milder lubricated rolling conditions (strict conditions from the viewpoint of slip generation), specifically, if you are rolling at a low rolling reduction or rolling a soft material, the base oil Increase the mixing amount of (1).

When the rolling speed increases, the oil film between the work roll and the rolled material increases, so that the lubricating state is generally mild. However, if the rolling speed exceeds 300 m / min, there is a possibility that the oil film may be broken due to the generation of frictional heat, and the lubrication conditions become severe.

The properties of the mixed base oil after mixing the base oil of (1) and the base oil of (2) are not particularly limited, but the following are preferred.

The aromatic component of the mixed base oil must be able to suppress a decrease in the surface gloss of the aluminum plate after rolling due to the enlargement of the roll coating and the like even under severe lubricating rolling conditions, and it is necessary to increase the amount of the oiling agent added. It is preferably not less than 1% by volume, more preferably not less than 2% by volume, because of the absence thereof and excellent antioxidation performance.
Even more preferably, it is at least 3% by volume.

Further, the mixed base oil preferably has an aromatic content of 20% by volume or less in order to satisfy working environment conditions such as being less likely to cause rough skin even if it adheres to the worker's skin and having a weak odor. It is more preferably 18% by volume or less, and even more preferably 16% by volume or less.

The naphthene content and paraffin content of the mixed base oil are not particularly limited, but the following are preferred. Naphthene content: 20% by volume or more, more preferably 25% by volume or more, most preferably 30% by volume or more, from the viewpoint of improving the gloss of the surface of the aluminum plate (foil) after rolling.
From the viewpoint of reducing the friction coefficient during high-pressure reduction rolling,
0 volume% or less, more preferably 75 volume% or less, most preferably 70 volume% or less.

Paraffin content: From the viewpoint of reducing the friction coefficient at the time of high-pressure rolling, the content is preferably 30% by volume or more, more preferably 35% by volume or more, and most preferably 40% by volume or more.
From the viewpoint of improving the gloss of the surface of the aluminum plate (foil) after rolling, it is preferably 75% by volume or less, more preferably 70% by volume or less, and most preferably 65% by volume or less.

The sulfur content of the mixed base oil can suppress a decrease in the gloss of the aluminum plate surface after rolling due to enlargement of the roll coating even under severe lubricating rolling conditions.
It is not necessary to increase the addition amount of the oil agent, and it is preferably 10 mass ppm or more, more preferably 50 mass ppm or more, and more preferably 70 mass ppm or more because it has excellent antioxidant performance. Is even more preferred.

Further, the mixed base oil preferably has a sulfur content of 300 mass ppm or less, because it satisfies working environment conditions such as being less likely to become rough even if it adheres to the worker's skin and having a weak odor. It is more preferably at most ppm by mass, and even more preferably at most 260 ppm by mass.

The viscosity of the base oil (1), the base oil (2) and the mixed oil thereof according to the present invention is not particularly limited.
Preferably has kinematic viscosity in the range of 1 to 10 mm ² / s at 40 ° C., respectively, is more preferable in the range of 1 to 8 mm ² / s, further preferably in a range of 1 to 6 mm ² / s . In the rolling process of aluminum, when forming a so-called foil having a thickness of 0.1 mm or less, an oil of 1 mm ² / s or more and 3 mm ² / s or less is preferable as a viscosity range in which lubricity and surface quality can be compatible. When forming a so-called strip having a thickness exceeding 0.1 mm (0.2 mm or more), 2 mm ² / s or more and 6 mm ² /
The following is preferred.

If the kinematic viscosity (40 ° C.) of the base oil (1), the base oil (2), or a mixed oil thereof is too low, the risk of fire due to ignition may increase. On the other hand, if it is too high, there is a risk that oil components called stains are easily seized on the surface of the material to be rolled during annealing, and damage called oil pits may occur on the surface of the material to be rolled and the surface gloss may deteriorate. There is a possibility that slip may occur due to excessive lubrication, the amount of abrasion powder generated may be increased, the surface of the material to be rolled may be damaged, and if the slip is excessive, processing may not be possible.

The rolling oil obtained by the production method of the present invention contains the two types of base oils described above, but may further contain any other additives. The mixing order of each component is arbitrary, and the additives are added after mixing the base oils (1) and (2), the base oil (2) is added after the additives are added to the base oil (1), Alternatively, any order of adding the additive to the base oil (2) and then adding the base oil (1) may be used.

In this case, the total content of the base oils (1) and (2) is usually preferably at least 50% by mass, more preferably at least 60% by mass, based on the total amount of the rolling oil. The content is even more preferably 70% by mass or more, and most preferably 80% by mass or more.

For example, the rolling oil according to the present invention may contain at least one oxygen-containing compound selected from the following.

(A1) The number average molecular weight is 200 or more and 100
Alkylene oxide adduct of polyhydric alcohol having 3 to 6 hydroxyl groups, which is less than 0 (A2) Hydrocarbyl ether of (A1) (A3) Polyalkylene glycol having a number average molecular weight of 120 or more and less than 1000 (A4) (A3 )) Hydrocarbyl ether (A5) Dihydric alcohol having 2 to 10 carbon atoms When such an oxygen-containing compound is added, it is possible to withstand aluminum rolling at a higher speed and a higher pressure and to improve the working environment. It is possible to obtain a rolling oil capable of suppressing the generation of metal soap and the generation of wear powder and suppressing the generation of stain.

The polyhydric alcohol constituting the component (A1) has 3 to 6 hydroxyl groups. Specific examples of such polyhydric alcohols include, for example, glycerin, polyglycerin (2 to tetramer of glycerin, for example, diglycerin, triglycerin, tetraglycerin), trimethylolalkane (trimethylolethane, trimethylolpropane , Trimethylol butane) and their dimers and tetramers, pentaerythritol, dipentaerythritol, 1,2,4-butanetriol, 1,3,5-
Such as pentanetriol, 1,2,6-hexanetriol, 1,2,3,4-butanetetrol, sorbitol, sorbitan, sorbitol glycerin condensate, adonitol, arabitol, xylitol, mannitol, iditol, talitol, dulcitol, and allitol Polyhydric alcohols; sugars such as xylose, arabinose, ribose, rhamnose, glucose, fructose, galactose, mannose, sorbose, cellobiose, maltose, isomaltose, trehalose, and sucrose; Glycerin, trimethylolalkane, sorbitol and the like are preferred from the viewpoint of excellent control of the amount of transfer (transfer).

The alkylene oxide constituting the component (A1) has 2 to 6 carbon atoms, preferably 2 to 4 carbon atoms.
Is used. Specific examples of the alkylene oxide having 2 to 6 carbon atoms include ethylene oxide, propylene oxide, 1,2-epoxybutane (α-butylene oxide), 2,3-epoxybutane (β-butylene oxide), , 2-epoxy-1-
Methylpropane, 1,2-epoxyheptane and 1,
Among them, 2-epoxyhexane is preferable, and among these, ethylene oxide, propylene oxide, and the like are preferable from the viewpoint of excellent controllability of the amount of adhesion (transfer) of aluminum to the tool.

When two or more alkylene oxides are used, there is no particular limitation on the type of polymerization of the oxyalkylene group, and they may be random copolymerized or block copolymerized. When the alkylene oxide is added to a polyhydric alcohol having 3 to 6 hydroxyl groups, the alkylene oxide may be added to all the hydroxyl groups or only a part of the hydroxyl groups. Arrival (transfer)
Adducts added to all hydroxyl groups are preferred from the viewpoint of excellent control of the amount.

Further, the component (A1) used in the present invention must have a number average molecular weight of 200 or more and less than 1000, preferably 250 or more and less than 750. An adduct having a number average molecular weight of less than 200 is not preferred because its solubility in base oil is reduced. In addition, the number average molecular weight is 100
Additions of 0 or more are not preferable because they may remain on the surface of the workpiece at the time of annealing after processing and cause stain.

The component (A1) used in the present invention is obtained by reacting a polyhydric alcohol having 3 to 6 hydroxyl groups with an alkylene oxide so that the number average molecular weight becomes 200 or more and less than 1,000. Or a mixture of an alkylene oxide adduct of a polyhydric alcohol having 3 to 6 hydroxyl groups obtained by an arbitrary method or a commercially available alkylene oxide adduct of a polyhydric alcohol having 3 to 6 hydroxyl groups May be separated by distillation or chromatography so that the number average molecular weight is 200 or more and less than 1000.

The component (A2) according to the present invention has a number average molecular weight of 200 or more and less than 1000, preferably 250 or more and 7 or less.
An alkylene oxide adduct of a polyhydric alcohol having 3 to 6 hydroxyl groups, which is less than 50, is hydrocarbyl etherified. As the component (A2),
The component (A1) obtained by subjecting part or all of the terminal hydroxyl groups of the alkylene oxide adduct of the component to hydrocarbyl etherification can be used. Here, the hydrocarbyl group refers to a hydrocarbon group having 1 to 24 carbon atoms. Carbon number 1
Specific examples of the hydrocarbon group 24 include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, and an n-
Butyl group, isobutyl group, sec-butyl group, tert
-A butyl group, a linear or branched pentyl group, a linear or branched hexyl group, a linear or branched heptyl group, a linear or branched octyl group, a linear or branched nonyl group,
Linear 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 branched icosyl group, A C1-C24 alkyl group such as a chain or branched henicosyl group, a straight or branched docosyl group, a straight or branched tricosyl group, a straight or branched tetracosyl group; a vinyl group, a straight chain Or branched propenyl, straight or branched butenyl, straight or branched pentenyl, straight or branched hexenyl, straight or branched heptenyl, straight or branched octenyl Group, straight or branched nonenyl group, straight or branched decenyl group, straight or branched undecenyl group, straight or branched dodecenyl group, straight or branched tridecenyl group, straight or branched Branched tetradecenyl group, straight or branched pentadecenyl group, straight or branched hexadecenyl group, straight or branched heptadecenyl group, straight or branched octadecenyl group, straight or branched nonadecenyl group A carbon number 2 such as a linear or branched icosenyl group, a linear or branched henicocenyl group, a linear or branched docosenyl group, a linear or branched tricosenyl group, a linear or branched tetracosenyl group; ~
An alkenyl group of 24; a cycloalkyl group having 5 to 7 carbon atoms such as a cyclopentyl group, a cyclohexyl group, and a cycloheptyl group; a methylcyclopentyl group, a dimethylcyclopentyl group (including all structural isomers), and a methylethylcyclopentyl group (all Structural isomers), diethylcyclopentyl group (including all structural isomers), methylcyclohexyl group, dimethylcyclohexyl group (including all structural isomers), methylethylcyclohexyl group (including all structural isomers) , Diethylcyclohexyl group (including all structural isomers), methylcycloheptyl group, dimethylcycloheptyl group (including all structural isomers), methylethylcycloheptyl group (including all structural isomers), diethylcyclo Carbon such as heptyl group (including all structural isomers) 6 to 11 alkylcycloalkyl groups; aryl groups having 6 to 10 carbon atoms such as phenyl group and naphthyl group: tolyl group (including all structural isomers), xylyl group (including all structural isomers), ethyl A phenyl group (including all structural isomers), a linear or branched propylphenyl group (including all structural isomers), a linear or branched butylphenyl group (including all structural isomers), Linear or branched pentylphenyl group (including all structural isomers), linear or branched hexylphenyl group (including all structural isomers), linear or branched heptylphenyl group (including all structural isomers) Linear or branched octylphenyl group (including all structural isomers), linear or branched nonylphenyl group (including all structural isomers), linear or branched Decylfe (Including all structural isomers), linear or branched undecylphenyl group (including all structural isomers), linear or branched dodecylphenyl group (including all structural isomers) C7-18 alkylaryl groups such as benzyl group, phenylethyl group, phenylpropyl group (including propyl group isomer), phenylbutyl group (including butyl group isomer), phenylpentyl group (pentyl) And a phenylhexyl group (including a hexyl group isomer), and an arylalkyl group having 7 to 12 carbon atoms. Among them, a linear or branched alkyl group having 3 to 12 carbon atoms is preferable from the viewpoint of excellent controllability of the amount of aluminum adhesion (transfer) to the tool.

The component (A3) is a polyalkylene glycol having a number average molecular weight of 120 or more and less than 1000, and is obtained by homopolymerizing or copolymerizing an alkylene oxide having 2 to 6 carbon atoms, preferably 2 to 4 carbon atoms. Specific examples of the alkylene oxide having 2 to 6 carbon atoms include those listed as the alkylene oxide constituting the component (A1). Among them, ethylene oxide, propylene oxide, and the like are preferable from the viewpoint of excellent controllability of the amount of aluminum adhesion (transfer) to the tool.

When two or more alkylene oxides are used for the preparation of the polyalkylene glycol, the polymerization form of the oxyalkylene group is not particularly limited, and may be a random copolymer or a block copolymer. .

Further, the component (A3) has a number average molecular weight of 120 to less than 1,000, preferably 120 to 5
It must be less than 00. Number average molecular weight is 12
If the polyalkylene glycol is less than 0, the solubility in the base oil decreases, which is not preferable. The number average molecular weight is 1000
The above-mentioned polyalkylene glycol is not preferred because it may remain on the surface of the workpiece during annealing after processing and cause stain.

As the component (A3), those which are reacted so that the number average molecular weight becomes 120 or more and less than 1000 when polymerizing the alkylene oxide may be used, or the polyalkylene obtained by any method may be used. A glycol mixture or a commercially available polyalkylene glycol mixture is distilled or chromatographed to have a number average molecular weight of 120.
It is also possible to use one separated so as to be less than 1000.

The component (A4) is obtained by hydrocarbyl etherifying a polyalkylene glycol having a number average molecular weight of 120 to less than 1,000, preferably 120 to less than 500. As the component (A4), (A3)
A part of or all of the terminal hydroxyl groups of the component polyalkylene glycol can be hydrocarbyl etherified. The term “hydrocarbyl group” as used herein refers to a hydrocarbon group having 1 to 24 carbon atoms, and specifically, for example, (A
Each group listed in the description of 2) can be mentioned. Among them, a linear or branched alkyl group having 3 to 12 carbon atoms is preferable from the viewpoint of excellent controllability of the amount of aluminum adhesion (transfer) to the tool.

The component (A5) is a dihydric alcohol having 2 to 10 carbon atoms, preferably 5 or 6 carbon atoms. The term "dihydric alcohol" used herein means a compound having no ether bond in the molecule. . As such a dihydric alcohol having 2 to 10 carbon atoms, specifically, for example, ethylene glycol, 1,3-propanediol, propylene glycol, 1,4-butanediol, 1,2-butanediol, 2- Methyl-1,3-propanediol, 1,5-
Pentanediol, neopentyl glycol, 1,6-
Hexanediol, 2-ethyl-2-methyl-1,3-
Propanediol, 2-methyl-2,4-pentanediol, 1,7-heptanediol, 2-methyl-2-propyl-1,3-propanediol, 2,2-diethyl-1,3-propanediol, , 8-octanediol, 1,9-nonanediol, 2-butyl-2-ethyl-1,3-propanediol, and 1,10-decanediol. Among these, 1,5-pentanediol, neopentyl glycol, 1,6-hexanediol, 2-methyl-2,4-pentanediol are excellent in the ability to adjust the amount of aluminum adhesion (transfer) to the tool. ,
2-ethyl-2-methyl-1,3-propanediol and the like are preferred.

In the present invention, (A1) and (A1)
2) One kind of oxygenates selected from (A3), (A4) and (A5) may be used alone, or a mixture of two or more kinds of oxygenates having different structures may be used. Is also good.

In the present invention, the content of the oxygen-containing compound is not particularly limited, but the upper limit of the content (total amount) based on the total amount of rolling oil is preferably 2% by mass, and
More preferably, the lower limit is 0.01% by mass.
%, More preferably 0.03% by mass. Oxygen compounds exceeding 2% by mass
The solubility in the base oil may be reduced, or the performance as a rolling oil may be adversely affected. If the oxygen-containing compound is less than 0.01% by mass, the effect of adjusting the amount of aluminum adhesion (transfer) to the tool may be reduced.

The rolling oil according to the present invention may contain an oil agent. The oil agent used in the present invention includes those usually used as an oil agent for rolling oil. However, in order to further improve the processability, it is preferable to use at least one oil agent selected from the following.

(1) Ester (2) Monohydric 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.

The monohydric alcohol usually has 1 to 1 carbon atoms.
Twenty-four alcohols are used, and such alcohols 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, linear or branched pentadecanol, linear or Branched hexadecanol, linear or branched heptadecanol, linear or branched octadecanol, linear or branched nonadecanol, linear or branched eicosanol, linear Or branched heneicosanol, linear or branched tricosanol, linear or branched tetracosanol and the like Mixtures thereof.

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

Among them, ethylene glycol, diethylene glycol, polyethylene glycol (3 to 10 mer of ethylene glycol), propylene glycol, dipropylene glycol, polypropylene glycol (3 to 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, trimethylolethane) Methylolpropane, trimethylolbutane, etc.) and their dimers and tetramers, 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 preferred are ethylene glycol, propylene glycol, neopentyl glycol, glycerin, trimethylolethane, trimethylolpropane, pentaerythritol, sorbitan, and mixtures thereof.

The monobasic acid constituting the ester oily agent usable in the present invention is usually a fatty acid having 6 to 24 carbon atoms,
It 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 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 Saturated fatty acids such as linear or branched docosanoic acid, linear or branched tricosanoic acid, 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 undecene 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 hydroxyoctadecenoic 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,
Examples include unsaturated fatty acids such as linear or branched tetracosenoic acids, and mixtures thereof. Among them, especially saturated fatty acids having 8 to 20 carbon atoms, 8 to 20 carbon atoms
Of unsaturated fatty acids, and mixtures thereof.

The polybasic acids constituting the ester oily agent 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,
Propane diacid, linear or branched butane diacid, linear or branched pentanedioic acid, linear or branched hexane diacid, linear or branched octane diacid, linear Linear or branched nonanedioic acid, linear or branched undecandioic acid, linear or branched undecandioic acid, linear or branched dodecanedioic acid, linear or branched tridecane Diacid, 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 tetradecenedioic acid, linear or branched heptadecenedioic acid, linear or branched Of hexadecenedioic acid; and mixtures thereof.

Examples of the ester oil agent include esters of monohydric alcohol and monobasic acid, esters of polyhydric alcohol and monobasic acid, esters of monohydric alcohol and polybasic acid, and esters of polyhydric alcohol and polybasic acid. Ester Mixed ester of monohydric alcohol, mixture of polyhydric alcohol and polybasic acid Mixed ester of polyhydric alcohol, monobasic acid, mixture of polybasic acid and monobasic alcohol, mixture of polyhydric alcohol and monobasic An ester obtained by combining an arbitrary alcohol and a carboxylic acid, such as a mixed ester with an acid or a mixture with a polybasic acid, can be used, and is not particularly limited.

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, and a part of the hydroxyl group which is not esterified but remains as a hydroxyl group may be used. Esters may be used. When a polybasic acid is used as the carboxylic acid component, a complete ester in which all of the carboxyl groups in the polybasic acid are esterified may be used, and a part of the carboxyl group remains unesterified and remains as a carboxyl group. It may be a partial ester.

As the ester used in the present invention, any of the above-mentioned esters can be used. Among them, esters of a monohydric alcohol and a monobasic acid are preferred from the viewpoint of more excellent workability.

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, and an ester having 9 or more is more preferable in view of an excellent effect of improving processability. Preferably, 11 or more esters are most preferred. Further, if the number of carbon atoms is too large, the possibility of increasing the occurrence of stain and corrosion increases. Therefore, an ester having a total carbon number of 26 or less is preferable, an ester of 24 or less is more preferable, and an ester of 22 or less is most preferable.

Examples of the above-mentioned (2) monohydric alcohol used as the oil agent include the compounds listed as the above-mentioned (1) alcohol constituting the ester. In terms of more excellent processability, a monohydric alcohol having 6 or more carbon atoms is preferable, and an alcohol having 8 or more carbon atoms is more preferable.
Alcohols having 10 or more carbon atoms are most preferred. Also, if the carbon number is too large, the possibility of increasing the occurrence of stain and corrosion increases, so 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 preferable. Most preferred.

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. Of these, monovalent carboxylic acids are preferred from the viewpoint of more excellent workability. Further, from the viewpoint of more excellent workability, 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 number of carbon atoms is too large, the possibility of increasing the occurrence of stain and corrosion increases, and therefore, carboxylic acids having 20 or less carbon atoms are preferable, carboxylic acids having 18 or less carbon atoms are more preferable, and carbon atoms having 16 or less carbon atoms are preferable. Carboxylic acids are most preferred.

As the oily agent of the rolling oil according to the present invention, as described above, only one kind selected from the above various oily agents may be used, or a mixture of two or more kinds may be used. Since the processability can be further improved, (1) an ester having 7 to 26 carbon atoms obtained from a monohydric alcohol and a monobasic acid, (2) a monohydric alcohol having 6 to 20 carbon atoms,
(3) Monobasic acids having 6 to 20 carbon atoms and mixtures thereof are preferred.

The total content of the above oil agent is not particularly limited, but is preferably 0.1 to 15% by mass based on the total amount of the rolling oil. From the viewpoint of processability, the lower limit of the content is 0.1% by mass.
It is preferably at least 0.2 mass%, more preferably at least 0.5 mass%. If the content is too large, the upper limit of the content is 15% by mass or less from the viewpoint that the occurrence of stain and corrosion may be increased, and that slip and uneven gloss may be caused. Preferably, it is 12% by mass or less, more preferably 10% by mass or less.

The rolling oil according to the present invention may contain an alkylbenzene having a kinematic viscosity at 40 ° C. of 1 to 60 mm ² / s. By using the alkylbenzene and the oily agent together, the effect of adding the oily agent can be further increased.

The alkylbenzene 4 used in the present invention
Kinematic viscosity at 0 ° C is 1 to 60 mm ^Two / S
preferable. Kinematic viscosity at 40 ° C is 1mm^Two Less than / s
In some cases, the effect of addition cannot be expected. Also,
Kinematic viscosity at 40 ° C is 60mm^Two / S
May increase the occurrence of stains and corrosion,
Preferably 40 mm^Two / S or less, more preferably 20 m
m^Two / 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 a methyl group, an ethyl group, a linear or branched propyl group, a linear or branched butyl group, a linear or branched butyl group. A branched pentyl group, a straight or branched hexyl group, a straight or branched heptyl group, a straight or branched octyl group, a straight or branched nonyl group, a straight or branched 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, linear or branched henicosyl group, linear or branched docosyl group, linear or branched tricosyl group, linear or branched tetracosyl group, linear 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 linear or branched hentriacontyl group, a linear or branched dotriacontyl group, a linear or branched tritriacontyl group, a linear or branched tetratriacontyl group , Linear or branched pentatriacontyl group, linear or branched hexatriacontyl group, linear or branched heptatriacontyl , 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 the alkylbenzene is usually 1 to 4, but from the viewpoint of stability and availability.
Alkylbenzene having one or two alkyl groups,
That is, monoalkylbenzene, dialkylbenzene,
Alternatively, a mixture thereof is most preferably used.

Further, as the alkylbenzene to be used,
Of course, not only alkylbenzene with a single structure,
A mixture of alkylbenzenes having different structures may be used.

The number average molecular weight of the alkylbenzene according to the present invention is not particularly limited, but is preferably 100 or more, more preferably 130 or more, from the viewpoint of the effect of addition. Further, if the molecular weight is too large, the possibility of increasing the occurrence of stain and corrosion increases, so the upper limit of the number average molecular weight is preferably 340 or less, more preferably 320 or less.

The above-mentioned alkylbenzene can be produced by any conventional method and is not limited at all. For example, the alkylbenzene can be produced by an alkylation synthesis method using the following substances.

As the aromatic compound as a raw material, specifically, for example, benzene, toluene, xylene, ethylbenzene, methylethylbenzene, diethylbenzene, and a mixture thereof are used. Specific examples of the alkylating agent include lower monoolefins such as ethylene, propylene, butene, and isobutylene, and preferably have 6 to 40 carbon atoms obtained by polymerization of propylene.
Linear or branched olefins having 6 to 40 carbon atoms obtained by pyrolysis of wax, heavy oil, petroleum fraction, polyethylene, polypropylene, etc .; kerosene, gas oil N-
A linear olefin having 9 to 40 carbon atoms, which is obtained by separating paraffin and subjecting it to olefination with a catalyst, and a mixture thereof can be used.

Examples of the alkylation catalyst for the alkylation include 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 /
To prepare an alkylbenzene of s, for example, an alkylbenzene mixture obtained by the method exemplified above or a commercially available alkylbenzene mixture is separated by distillation or chromatography, and the kinematic viscosity is 1 to 60 mm ² / s.
It is practically convenient to obtain an alkylbenzene fraction of

The rolling oil according to 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 rolling oil. The lower limit of the content is preferably 0.1% by mass or more, more preferably 0.1% by mass, from the viewpoint of the effect of addition.
It is at least 5% by mass, more preferably at least 1% by mass.
Further, when the content is too large, the possibility of increasing the occurrence of stain and corrosion becomes large. Therefore, the upper limit is preferably 50% by mass or less, more preferably 40% by mass or less, and still more preferably 30% by mass or less. is there.

The rolling oil according to the present invention may further contain an extreme pressure additive, if necessary, in order to further improve its excellent effects.
Antioxidants, rust inhibitors, corrosion inhibitors, defoamers, etc. 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 organic metal compounds such as zinc dialkyldithiophosphate. Can be exemplified.

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 salts thereof. Derivatives can be exemplified. Examples of the corrosion inhibitor include benzotriazole. Examples of the antifoaming agent include silicone-based ones. The total content of these additives is usually 15% by mass or less, preferably 10% by mass or less (all based on the total amount of rolling oil).

Base oil (1) and base oil (2) according to the present invention
Rolling oil obtained by mixing additives and the like as necessary,
The viscosity is not particularly limited, but preferably has a kinematic viscosity at 40 ° C. in the range of 1 to 10 mm ² / s.
Those in the range of ８8 mm ² / s are more preferable.
Those having a range of 6 mm ² / s are more preferable. In addition, in the rolling process of aluminum, when forming a so-called foil having a thickness of 0.1 mm or less, the viscosity range is 1 mm ² / s or more and 3 m or more as a viscosity range in which lubricity and surface quality can be compatible.
A rolling oil of m ² / s or less is preferable, and when a so-called strip having a thickness of more than 0.1 mm (0.2 mm or more) is formed, a rolling oil of 2 mm ² / s or more and 6 mm ² / s or less is preferable.

If the kinematic viscosity (40 ° C.) of the rolling oil is too low, the risk of fire due to ignition may increase. On the other hand, if it is too high, there is a concern that the rolling oil component called stain may easily stick to the surface of the workpiece during annealing, and damage called oil pits occurs on the surface of the workpiece and the surface gloss deteriorates There is a danger that slip may occur due to over-lubrication, the amount of abrasion powder generated may be increased, the surface of the workpiece may be damaged, and if the slip is excessive, processing may not be possible.

The rolling oil produced by the method of the present invention comprises:
Used for cold rolling of aluminum and aluminum alloys, other steel, stainless steel, special steel,
It can also be used for rolling various metals such as copper and alloys of these metals.

The rolling oil according to the present invention exerts excellent effects mainly when used in cold rolling, but can also be used in general plastic working such as drawing, ironing, drawing, and pressing. Further, it can be used for cutting, grinding, and the like other than plastic working.

[0093]

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. Examples 1 to 10 and Comparative Examples 1 to 7 Various rolling oils having the following compositions were prepared, and various tests were performed on these by the methods shown below. The test results are shown in Tables 1 and 2.

Rolling oil (% by mass of base oil A and base oil B is based on the total amount of mixed base oil, and the other mass% is based on total amount of rolling oil). Example 1: 60% by mass of base oil A + 40% by mass of base oil B + mixed Oil agent A Example 2: 60% by mass of base oil A + 40% by mass of base oil B + mixed oil agent B Example 3: 70% by mass of base oil A + 30% by mass of base oil B + mixed oil agent A Example 4: Example 1 Example 5: Rolling oil of Example 1 + 0.5% by mass of polyethylene glycol monostearate (average number of oxyethylene groups polymerized) + 5% by mass of rolling oil of styrene + alkylbenzene (kinematic viscosity: 8.3 mm ² / s @ 40 ° C.) n = 25) Example 6: Rolling oil of Example 1 + 0.5% by mass of polyethylene glycol monononylphenyl ether (average polymerization number of oxyethylene groups n = 25) Example 7: Rolling oil of Example 1 + polyethylene Glycol monolauryl 0.5% by mass of ether (average number of polymerization of oxyethylene groups n = 25) Example 8: Rolling oil of Example 1 + 0.5% by mass of tripropylene glycol Example 9: Rolling oil of Example 1 + Hexylene 0.5% by mass of glycol Example 10: 80% by mass of base oil A + 20% by mass of base oil B + mixed oil agent A Comparative Example 1: 100% by mass of base oil A + mixed oil agent A Comparative Example 2: 100% by mass of base oil A + Mixed oil agent B Comparative Example 3: 100% by mass of base oil B + mixed oil agent A Comparative Example 4: 100% by mass of base oil A + mixed oil agent C

Base oil A: Aromatic content 0.5% by volume, sulfur content 1.2 mass ppm, paraffin content 28.5% by volume, naphthene content 71% by volume, kinematic viscosity 2.58 mm ² / s @ 40 ° C. B : Aromatic content 18% by volume, sulfur content 348 mass ppm, paraffin content 36% by volume, naphthene content 46% by volume, kinematic viscosity 2.49 mm ² / s @ 40 ° C

Mixed oil agent (% by mass is based on the total amount of rolling oil): A: 7% by mass of lauryl alcohol + 1.5% by mass of butyl stearate + 0.05% by mass of oleic acid B: 2% by mass of lauryl alcohol + stearin 1.0% by mass of butyl acrylate + 0.05% by mass of oleic acid C: 10% by mass of lauryl alcohol + 2.5% by mass of butyl stearate + 0.05% by mass of oleic acid

[0097] limit rolling reduction test material A: JIS A1050,0.5mm thickness material B: JIS 1N30 H18,0.1mm thickness work roll: diameter 51 mm, surface roughness: Ra = 0.04
μm Rolling speed: 30 m / min Reduction ratio% = 100 × (initial thickness of material−remaining thickness of rolled material) / initial thickness of material Using each rolling oil, material A or B is placed between two work rolls. Through the rolling, the rolling reduction was gradually increased from 45%, and the maximum rolling reduction that could be rolled without causing damage such as seizure or herringbone on the material surface was obtained.

Slip test material C: JIS A5182, 1.0 mm thick Work roll: diameter 51 mm, surface roughness: Ra = 0.04
μm Rolling speed: 30 m / min, rolling reduction: 40% Advance rate% = 100 × (discharge side plate speed-work roll peripheral speed)
/ Work roll peripheral speed The material C was rolled in an atmosphere of a temperature of 27 ° C. and a humidity of 49% using each rolling oil, and a degree of slip generated between the work roll and the material at that time was determined by measuring an advanced rate. . When the advance rate is negative, it indicates that a slip has occurred.

However, only the rolling oil of Example 10 (in which the mixing ratio of the base oil was changed as compared with Example 1) had a high rolling speed of 7 mm.
The test was performed at 0 m / min.

Stainability test Inst. Metals. , 88, 481 (195
According to CanTest described in 9), 0.1 ml of each rolling oil (a filtrate obtained by passing the rolling oil after the slip test through a filter having a pore size of 1 μm) was dropped into an aluminum cup, and the resulting mixture was cooled from room temperature over 150 minutes. The temperature was raised to 350 ° C., and further kept at 350 ° C. for 60 minutes, then taken out, and the degree of generation of stain on the inner surface of the cup was visually evaluated. Evaluation,
1: No stain, 2: Slight, 3: Small, 4: Medium
5: Large, the average value was obtained in five tests. The average was rated as ◎ when it was less than 1.5, ○ when it was 1.5 or more and less than 2.5, and Δ when it was 2.5 or more and less than 3.5.

Oxidation stability test The oxidation stability of each rolling oil was determined by JIS K2514 "Rotating cylinder type oxidation stability test". RBOT the result
Shown by value.

Odor Judgment Test 30 g of each rolling oil of Examples 1, 3 and 10 and Comparative Examples 1 and 3 was collected in a 100 mL screw bottle without containing an oil agent, and heated in a water bath at 40 ° C. for 30 minutes. Then, the odor was judged by 20 persons. Very worried (5 points), worried (4 points), slightly worried (3
Points), scored in 5 steps of almost unnoticeable (2 points) and not bothered (1 point), and the average score was less than 2.5 points as ○, 2.5 points or more as x, and odor judgment was made. did.

Roughness determination test A commercially available patch test bandage was impregnated with 0.3 mL of each of the rolling oils of Examples 1, 3 and 10 and Comparative Examples 1 and 3 without containing an oily agent. It was stuck to five places and after one hour, the condition of the peeled skin was visually observed. The number of subjects was 20 and scored in three stages: red (3 points), faint red (2 points), and no change (1 point). And two or more points were judged as x.

[0104]

[Table 1]

[0105]

[Table 2] As is apparent from the results in Table 1, the rolling oil produced by the method of the present invention can be used under various rolling conditions and does not impair the working environment, and the rolled product has excellent gloss and less occurrence of uneven gloss. I understand.

Further, as is apparent from the results of Examples 1 and 10, by increasing the ratio of the base oil A (base oil (1)), the rolling conditions in a milder lubricated state (from the viewpoint of slip generation, It can be understood that it can cope with severe conditions).

[0107]

According to the method of the present invention, since two specific base oils are mixed at different mixing ratios, it is possible to produce an aluminum cold rolling oil that is optimal for various rolling conditions.

Specifically, the obtained rolling oil can be used under severe rolling conditions or mild rolling conditions, can increase the gloss value of the rolled product, suppress the occurrence of uneven gloss, and improve the odor and the workability. The skin of the person is less rough, and the antioxidant performance and the oxidation stability are excellent.

Claims (1)

[Claims] 1. A method for producing a cold rolling oil for aluminum, comprising: (1) a base oil having an aromatic content of 5% by volume or less and a sulfur content of 3 mass ppm or less; 10
30% by volume or more and 30% by mass of sulfur
A method for producing a cold-rolled oil for aluminum, comprising mixing a base oil of at least m and not more than 500 mass ppm.