JP2000169865A - Oil composition for cold rolling of aluminum or the like - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an oil composition for cold rolling of aluminum or the like free from the risk of taking fire, capable of suppressing the occurrence of stain and suitable for rolling at a high speed under a high pressure by adding a mineral oil having an ignition point of a specific temperature or higher, and a boiling point in a specific range, as a base oil. SOLUTION: This oil composition contains a mineral oil having an ignition point of 120 deg.C or higher, preferably 125 deg.C or higher, more preferably 130 deg.C or higher, and having the difference between the 5%-running point and the 95%-running point of 30 deg.C or less, preferably 28 deg.C or less, more preferably 25 deg.C or less, which contains mainly paraffin, naphthene or the like as a base oil. Further, the composition preferably contains a poly-α-olefin, an alkylenenaphthalene, a polyol ester, a silicone oil or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cold rolling oil composition such as aluminum used for cold rolling of aluminum or an aluminum alloy (both are collectively referred to as aluminum or the like).

[0002]

2. Description of the Related Art In cold rolling of aluminum or the like, it is required to process aluminum or the like at a higher speed and a higher rolling reduction in order to improve productivity. However, rolling performed at a high speed and at a high rolling reduction (hereinafter, referred to as high speed / high rolling reduction) may increase the risk of fire. The main cause is that the rolled material becomes extremely hot due to the frictional heat generated by the high-speed rolling and the processing heat generated by the high-pressure rolling, so that a large amount of flammable rolling oil vapor (mist) is generated. Measures to reduce the risk of fire include:
Although it is conceivable to use high flash point oil as a base oil for rolling oil, the mere adoption of high flash point oil cannot be commended for the following reasons. High flash point oils usually contain a considerable amount of heavy components, but since these heavy components are less likely to evaporate than light components, when the rolling oil is used repeatedly, the heavy components are contained in the rolling oil. Is concentrated. Therefore, this heavy component is repeatedly exposed to high temperatures, which not only results in an increase in the viscosity of the rolling oil, but also promotes oxidative deterioration. In addition, when the oxidized and deteriorated rolling oil adheres to and remains on the material after the rolling process, there is an inconvenience of causing severe oil burning called stain. Under these circumstances, even during high-speed and high-pressure rolling, it is possible not only to avoid the danger of a fire, but also to suppress the heavy and oxidative deterioration of oil due to heat, and to substantially suppress the generation of stain. The development of rolling oil is required. An object of the present invention is to provide a cold rolling oil composition such as aluminum which can satisfy the above-mentioned requirements. The oil composition of the present invention exhibits particularly excellent effects when rolling aluminum or the like at a high speed and at a high rolling reduction.

[0003]

Means for Solving the Problems The inventors of the present invention have developed a cold-rolling method which meets the above-mentioned object by using a mineral oil having a flash point above a specific temperature and a specific boiling point range as a base oil. It has been found that an oil composition is obtained. That is,
The cold rolling oil composition such as aluminum provided by the present invention has a flash point of 120 ° C. or higher and a 5% distillation temperature of 9%.
It is characterized by containing as a base oil a mineral oil having a 5% distilling temperature difference of 30 ° C. or less.

[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 composition according to the present invention has a flash point of 120 ° C. or higher. When the flash point is lower than 120 ° C., there is a possibility that ignition may occur at the time of high-speed / high-pressure reduction rolling. Therefore, the flash point of base oil is 125
C. or higher, more preferably 130.degree. C. or higher. The upper limit of the flash point of the base oil is not particularly limited, but if it is too high, it may cause the generation of stain. Therefore, it is preferably 170 ° C or lower, more preferably 165 ° C or lower. In the present invention, the flash point is defined as JIS K
2265 Refers to the value measured by the "Cleveland Open" test method of "Crude Oil and Petroleum Products-Flash Point Test Method". The base oil of the rolling oil composition of the present invention has a 5% distillation temperature (T
₅₎ that it is necessary that the difference is 30 ° C. or less and 95% distillation temperature (T _{9 5).} If this difference is too large, heat of friction,
The heaviness of the oil due to the processing heat becomes remarkable and causes stain, which is not preferable. From this viewpoint, the above temperature difference is preferably within 28 ° C., more preferably within 25 ° C. T for ₅ and T ₉₅ itself of value, there is no limit. However, T ₅ is preferably 190 ° C. or higher, and more preferably 200 ° C. or higher, since the risk of fire can be reduced. The upper limit of T ₅ is usually 320 ° C. or less, 31
It is preferably 0 ° C. or lower. Further, T ₉₅ is preferably 330 ° C. or lower, and more preferably 320 ° C. or lower, since generation of stain can be further prevented. The lower limit of T ₉₅ is usually 220 ° C. or higher, 2
The temperature is preferably 30 ° C. or higher. Furthermore, since it is possible to further reduce the risk of fire, T ₅ 27
The temperature is preferably 0 ° C or higher, more preferably 280 ° C or higher. For the same reason, _T95 is 28
The temperature is preferably 5 ° C. or higher, more preferably 295 ° C. or higher. In the rolling oil composition of the present invention, there is no limitation on the initial boiling point and end point of the base oil. However, the initial boiling point is preferably 180 ° C. or higher, more preferably 190 ° C. or higher, since the risk of fire can be further reduced. For the same reason, the end point is preferably at least 290 ° C.
It is more preferable that the temperature is not lower than 00 ° C. In addition, since the occurrence of stain can be further prevented, the initial boiling point is 3
It is preferably at most 05 ° C, more preferably at most 300 ° C. For the same reason, the end point is 340 ° C
Or less, more preferably 330 ° C. or less.

[0005] The mineral oil used as the base oil of the rolling oil composition of the present invention is not particularly limited in its composition. However,
In high-speed and high-pressure rolling, rolling oil mist is inevitably generated, and the presence of a large amount of polycyclic aromatics, which may cause carcinogenicity, in the mist deteriorates the working environment. I have to worry. In this sense, the mineral oil used in the base oil preferably has an aroma content of 20% by volume or less, more preferably 10% by volume or less, even more preferably 7% by volume or less, and 4% by volume. % Is most preferred. In the present invention, the aroma content refers to a value measured by applying the fluorescence indicator adsorption method of JIS K 2536 “Petroleum products-hydrocarbon type test method”. Further, the mineral oil used for the base oil preferably has a naphthene content of 10 to 90%, preferably 15 to 85%, more preferably 20 to 80% by mass spectrometry described below. The paraffin content by mass spectrometry described below is desirably 10 to 90%, preferably 15 to 85%, and more preferably 20 to 80%. The measurement of the naphthene component and the paraffin content is performed using molecular ion intensity data obtained by mass spectrometry by 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 surface of the sample solution reaches the upper end of the silica gel, 140 ml of n-pentane is injected to separate a saturated hydrocarbon component, and the eluate is collected 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. The FI ionization method using a glass reservoir is used as the ionization method in the mass spectrometry, and JMS-AX505H manufactured by JEOL Ltd. is used as the mass spectrometer. 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 Injection amount of sample: The molecular ions obtained by mass spectrometry of 1 μl are paraffins (C _n H _{2n + 2} ) and naphthenes (C _n H _2n , C _n H _{2n −} ) from the mass numbers after isotope correction. ₂ , C _n H _2n-4 …)), the fraction of each ionic strength is determined, and the content of each type with respect to the entire saturated hydrocarbon component is determined. 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. The details of the data processing by the type analysis method of the FI method mass spectrometry are described in “Nisseki Review”, Vol. 33, No. 4, pp. 135-142, particularly, “2.2.3 Data processing”. .

[0006] The mineral oil used as the base oil of the rolling oil composition of the present invention is not particularly limited in viscosity, but the kinematic viscosity at 40 ° C can be further reduced because the risk of fire due to ignition can be further reduced. Is preferably at least 1.1 mm ² / s, more preferably at least 1.3 mm ² / s, and most preferably at least 1.5 mm ² / s. On the other hand, if the viscosity is too high, surface damage called oil pits may occur on the material after rolling, and the surface gloss may be deteriorated, stain may be caused, and the rolling speed may be increased. It can be difficult. From these points, the kinematic viscosity at 40 ° C. is 6.5 m
m ² / s or less, more preferably 6.3 mm ² / s or less, and most preferably 6.0 mm ² / s or less. The mineral oil serving as the base oil of the rolling oil composition of the present invention can be obtained by any method. Typically, solvent removal, solvent extraction, hydrocracking, and solvent removal are performed on lubricating oil fractions obtained by atmospheric and vacuum distillation of paraffinic, naphthenic, or mixed crude oils. Wax, catalytic dewaxing, hydrorefining, sulfuric acid washing,
Mineral oil obtained by appropriately combining one or more refining means such as clay treatment can be used as the base oil of the present invention. Mineral oils obtained by further subjecting these mineral oils to a low aromatic treatment can also be used as the base oil of the present invention. The base oil in the rolling oil composition of the present invention may be composed of one or more of the above-described mineral oils.

[0007] The rolling oil composition of the present invention uses the above-mentioned mineral oil as a base oil. However, to the extent that its excellent performance is not impaired, the synthetic oil used as a base oil for general lubricating oils is used. May be included. Examples of such synthetic oils include poly-α-olefins (ethylene-propylene copolymer, polybutene, 1-octene oligomer,
-Decene oligomers and hydrides thereof),
Alkyl naphthalene, monoester (butyl stearate, octyl laurate), diester (ditridecyl glutarate, di-2-ethylhexyl adipate, diisodecyl adipate, ditridecyl adipate, di-
2-ethylhexyl sepacate, etc.), polyester (such as trimellitate), polyol ester (trimethylolpropane caprylate, trimethylolpropaneperargonate, pentaerythritol-2)
-Ethylhexanoate, pentaerythritol pelargonate, etc.), polyoxyalkylene glycol, polyphenyl ether, dialkyl diphenyl ether,
Phosphate esters (tricresyl phosphate, etc.),
Examples thereof include fluorinated compounds (such as perfluoropolyether and fluorinated polyolefin) and silicone oils (excluding alkylbenzene).

[0008] Usually, rolling oil is used in the form of a base oil mixed with an oily agent. The oily agent that can be blended with the rolling oil composition of the present invention is not particularly limited, but from the viewpoint that the rollability can be further improved and that various properties required for the rolling oil are not adversely affected, etc. It is desirable to blend at least one oily agent selected from the group consisting of: (1) Ester (2) Alcohol (3) Carboxylic acid The alcohol constituting the ester of the above (1) may be a monohydric alcohol or a polyhydric alcohol, 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, linear or branched pentadecanol, linear or branched hexadecanol, linear or branched heptadecanol, linear Linear or branched octadecanol, linear or branched nonadecanol, linear or branched eicosanol, linear or branched heineicosanol, linear or branched tricosanol, linear And branched tetracosanols and mixtures thereof. As the polyhydric alcohol, 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, etc.), trimethylolalkanes (trimethylolethane, trimethylolpropane, trimethylolbutane, etc.) and their 2- to 8-mers, pentaerythritol and their 2- to 2-mer
Tetramer, 1,2,4-butanetriol, 1,3,5-
Polyhydric alcohols such as pentanetriol, 1,2,6-hexanetriol, 1,2,3,4-butanetetrol, sorbitol, sorbitan, sorbitol glycerin condensate, adonitol, arabitol, xylitol, mannitol; xylose, arabinose, Examples include saccharides such as ribose, rhamnose, glucose, fructose, galactose, mannose, 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 dimers and tetramers, pentaerythritol, dipentaerythritol 1,2,4-butanetriol,
3,5-pentanetriol, 1,2,6-hexanetriol, 1,2,3,4-butanetetrol, sorbitol, sorbitan, sorbitol glycerin condensate,
Divalent to hexavalent polyhydric alcohols such as adonitol, arabitol, 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 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 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 Saturated fatty acids such as linear or branched heneicosanoic acid, 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 undecenoic acid, linear or branched dodecenoic acid, linear or branched tridecenoic acid,
Linear or branched tetradecenoic acid, linear or branched pentadecenoic acid, linear or branched hexadecenoic acid, linear or branched octadecenoic acid, linear or branched hydroxyoctadecene Acid, linear or branched nonadecenoic acid, linear or branched eicosenoic acid, linear or branched heneicosenoic acid, linear or branched docosenoic acid, linear or branched trichocene Acids, unsaturated fatty acids such as linear or branched tetracosenoic acids, and mixtures thereof.
Among these, a saturated fatty acid having 8 to 20 carbon atoms, an unsaturated fatty acid having 8 to 20 carbon atoms, and a mixture thereof are particularly preferable. Examples of the polybasic acid include dibasic acids having 2 to 16 carbon atoms and trimellitic acid. 2 carbon atoms
The 16 dibasic acids 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 decandioic acid, 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, straight Jo or branched tridecenoic acid, straight-chain or branched tetradecene diacid, linear or branched heptadecenoic acid, include linear or branched hexadecene diacid, and mixtures thereof.

Esters having different combinations of alcohol and carboxylic acid include esters of monohydric alcohol and monobasic acid, esters of polyhydric alcohol and monobasic acid, and esters of monohydric alcohol and polybasic acid. Ester with polybasic acid Monoester, mixed ester with polyhydric alcohol and mixed ester with polybasic acid Polyester with monobasic acid, mixed ester with mixed with polybasic acid Monohydric alcohol, polyhydric alcohol and And a mixed ester of a monobasic acid and a polybasic acid, and the like, and any of these can be used as the oil agent of the present invention. 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, 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. The ester used in the present invention may be any of the above-mentioned ones, and among them, the rollability can be further improved and the adverse effect on various properties required as a rolling oil is small, so that the monovalent ester is used. Esters of alcohols and monobasic acids are preferred. 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 of 9 or more is more preferable from the viewpoint of more excellent workability improving effect. , 11
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 carbon number of 22 or less is more preferable since the generation of stain and corrosion can be further prevented.

The alcohol of the above (2) may be a monohydric alcohol or a polyhydric alcohol. Specifically, for example,
The compounds listed as the alcohol constituting the ester of the above (1) are exemplified. Among these, monohydric alcohols are preferred because they can further improve the rollability and have less adverse effects on various properties required as rolling oil. 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, since generation of stain and corrosion can be further prevented.

The carboxylic acid (3) may be a monobasic acid or a polybasic acid. Specifically, for example, the compounds listed as the carboxylic acid constituting the ester of the above (1) can be mentioned. Among these, monocarboxylic acids are preferred because they can further improve the rollability and have less adverse effects on various properties required as a rolling oil. 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 effect of improving the rolling property. In addition, a carboxylic acid having 20 or less carbon atoms is preferable, and a carboxylic acid having 18 or less carbon atoms is more preferable because generation of stain and corrosion can be further prevented. The oily agent of the rolling oil composition of the present invention is selected from the oily agents described in (1) to (3) above.
Only a species may be used, or a mixture of two or more species may be used. However, since the rolling property can be further improved, and the adverse effects on various properties required as the rolling oil are smaller, the oil agent to be blended in the rolling oil composition of the present invention includes:
(1 ′) an ester having a total of 7 to 26 carbon atoms obtained from a monohydric alcohol and a monobasic acid, and (2 ′) an ester having a carbon number of 6 to 20.
It is preferable to use a polyhydric alcohol, (3 ′) a monobasic acid having 6 to 20 carbon atoms, and a mixture thereof. Furthermore, by using a dihydric alcohol in combination with these,
Rollability can be further improved. The content of the above oil agent is not particularly limited, but if it is too small, the effect of addition may not be exhibited. Therefore, the content is preferably 0.1% by mass or more based on the total amount of the composition (as the total amount of the oil agent). , 0.
It is more preferably at least 2% by mass, most preferably at least 0.5% by mass. Further, since the generation of stain and corrosion can be further prevented, the content is preferably 15% by mass or less.
It is more preferably at most 2% by mass, most preferably at most 10% by mass.

In order to further improve the rolling property of the rolling oil composition of the present invention, it is desirable to incorporate alkylbenzene. In particular, when a mineral oil having a low aroma content is used as the base oil of the rolling oil composition of the present invention, the effect of adding the oil agent due to the addition of alkylbenzene becomes remarkable.
The alkylbenzene used in the present invention preferably has a kinematic viscosity at 40 ° C. in the range of 1 to 60 mm ² / s. From the viewpoint of the effect of improving the rolling property, the kinematic viscosity at 40 ° C. is preferably 1 mm ² / s or more. In addition, the kinematic viscosity at 40 ° C. is preferably 60 mm ² / s or less, more preferably 40 mm ² / s or less, and 20 mm ² / s or less, since generation of stain can be further prevented. Is even more preferred. 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. Is preferred, more preferably an alkyl group having 1 to 40 carbon atoms, and most preferably an alkyl group having 1 to 20 carbon atoms. Specific examples of the alkyl group having 1 to 20 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 A 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, a 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 Ikoshi Such as a group, and the like. The number of alkyl groups in the alkylbenzene is usually 1 to 4. However, from the viewpoint of stability and availability, an alkylbenzene having one or two alkyl groups, that is, a monoalkylbenzene, a dialkylbenzene, or a mixture thereof is used. Most preferably used. In addition, as the alkylbenzene, not only an alkylbenzene having a single structure but also a mixture of alkylbenzenes having different structures may be used. The number average molecular weight of the alkylbenzene used in the present invention is not particularly limited, but is preferably 100 or more, and more preferably 130 or more, from the viewpoint of the effect of improving the rolling property. In addition, the number average molecular weight is preferably 360 or less, and more preferably 340 or less, since generation of stain can be further prevented. The method for producing the above-mentioned alkylbenzene is arbitrary and is not limited at all. For example, the alkylbenzene can be produced by the following synthesis method. As the aromatic compound as a raw material,
Specifically, for example, benzene, toluene, xylene, ethylbenzene, methylethylbenzene, diethylbenzene, a mixture thereof and the like are used. As the alkylating agent, specifically, for example, lower monoolefins such as ethylene, propylene, butene, and isobutylene, preferably linear or branched olefins having 6 to 60 carbon atoms obtained by polymerization of propylene; Linear or branched olefins having 6 to 60 carbon atoms obtained by pyrolysis of wax, heavy oil, petroleum fraction, polyethylene, polypropylene, etc .; separating n-paraffins from petroleum fractions such as kerosene and gas oil And linear olefins having 9 to 60 carbon atoms obtained by olefination thereof with a catalyst; and mixtures thereof. Known alkylation catalysts 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 catalyst is used.

An antioxidant can be added to the rolling oil composition of the present invention for the purpose of further improving the heat deterioration preventing property. In particular, when a base oil having a high flash point is used to prevent the risk of fire as in the present invention, it is preferable to add an antioxidant. Examples of the antioxidant include a phenolic antioxidant and an aromatic amine antioxidant. As phenolic antioxidants,
Examples thereof include an alkylphenol having one or more alkyl groups having 1 to 18 carbon atoms, and more specifically, 2,6-ditert-butyl-p-cresol (DB
PC) and 2,6-di-tert-butylphenol. Specific examples of the aromatic amine antioxidant include, for example, diphenylamine, dialkyldiphenylamine (the alkyl group has 1 to 18 carbon atoms),
Phenyl-α-naphthylamine, alkylphenyl-α
-Naphthylamine (the alkyl group has 1 to 18 carbon atoms),
Phenothiazine, N-alkylphenothiazine (the alkyl group has 1 to 18 carbon atoms) and the like. The amount of the antioxidant in the rolling oil composition of the present invention is not particularly limited, but is usually 0.1 to 5% by mass based on the total amount of the composition. However, when a base oil having a high flash point is used to prevent the risk of fire as in the present invention, the oil component that has undergone thermal degradation remains in the material after rolling, and stains are likely to occur. , 0.3% by mass or more. Further, since the effect corresponding to the added amount cannot be obtained even if the amount is too large, 3% by mass or less is preferable, 2.5% by mass or less is more preferable, and 2% by mass or less is more preferable. In the rolling oil composition of the present invention, in order to further improve its excellent effects, if necessary, an extreme pressure additive, a rust inhibitor, a corrosion inhibitor, an antifoaming agent, or the like, alone or in combination of two or more. Can be added. Examples of the extreme pressure additive include phosphorus compounds such as tricresyl phosphate 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 Can be exemplified. Examples of the corrosion inhibitor include benzotriazole. Examples of the antifoaming agent include silicone-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 viscosity of the rolling oil composition of the present invention is not particularly limited, but the kinematic viscosity at 40 ° C. is 1.1 mm ² because the risk of fire due to ignition can be further reduced.
/ S or more, more preferably 1.3 mm ² / s or more, and most preferably 1.5 mm ² / s or more. However, if the viscosity is too high, surface damage called oil pits occurs on the material after rolling, and the surface gloss may be deteriorated, stain may be generated, and it is difficult to increase the rolling speed. The kinematic viscosity at 40 ° C. is preferably 6.5 mm ² / s or less from the viewpoint that
mm ² / s or less, more preferably 6 mm ² / s
It is most preferred that:

[0015]

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 5 Table 1 shows the properties of the base oil used in the examples and comparative examples.

[Table 1] With respect to the base oils 1 and 2 shown in Table 1, the degree of heavy conversion was measured by the following method. Heavy Weight Measurement Method A steel ball having a volume of 145 mL heated to 150 ° C. was put into a 5 L sample oil, and the steel ball was taken out after 5 minutes. This operation was repeated 5 times after the temperature of the sample oil reached room temperature to cause thermal deterioration. The kinematic viscosity at 40 ° C. before thermal degradation (V1) and the kinematic viscosity at 40 ° C. of the sample oil after thermal degradation (V2) were measured, and the rate of change in kinematic viscosity before and after thermal degradation represented by the following formula (heavy weight) Conversion rate)
Was calculated. The results are shown in Table 1. Weight ratio (%) = 100 × (V2−V1) / V1 Using the above base oils, sample oils having the compositions shown in Table 2 were prepared. Each of these compositions was subjected to a stain generation test, an oxidation stability test, and a rollability test. Table 2 shows the results. The oil agent is industrial alcohol (a mixture of straight-chain alcohols having 12 to 16 carbon atoms), the antioxidant is DBPC, and the alkylbenzene has a kinematic viscosity (ｍｍ40 ° C.) of 5.5 mm ² / s and a number average molecular weight. 246
Was used. Stain generation test The stain generation test was performed by applying CanTest described in J. Inst. Metals. 88 (1959) 481. That is, 0.05 ml of sample oil was dropped into an aluminum cup, heated from room temperature to 350 ° C. over 45 minutes, kept at 350 ° C. for 240 minutes, taken out, and visually evaluated for stain generation. Even when no stain occurs, ◎ indicates that a very small amount occurs, △ indicates a slight occurrence, and X indicates an entire surface. Oxidation stability test For each sample oil, an oxidation stability test was conducted based on the “Rotating cylinder type oxidation stability test (RBOT)” of JIS K 2514 “Lubricating oil-Oxidation stability test method” to evaluate the oxidation deterioration due to heat. The degree was observed. Rolling test A test rolling was performed under the following conditions, and the rolling reduction was gradually increased from 50% until seizure or herringbone occurred and rolling became impossible. Table 2 shows the rolling reduction (critical rolling reduction) before seizure or herringbone occurs and rolling becomes impossible. Rolled material JIS A1050 0.8mm thickness Reduction rate 30% ~ Rolling speed 100m / min

[Table 2]

Claims (1)

[Claims] 1. A flash point of not lower than 120 ° C. and 5%
A composition for a cold rolling oil such as aluminum using a mineral oil as a base oil, wherein a difference between a distillation temperature and a 95% distillation temperature is 30 ° C. or less.