Classifications

• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M161/00—Lubricating compositions characterised by the additive being a mixture of a macromolecular compound and a non-macromolecular compound, each of these compounds being essential
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
  • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
  • C10M2203/1006—Petroleum or coal fractions, e.g. tars, solvents, bitumen used as base material
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
  • C10M2207/02—Hydroxy compounds
  • C10M2207/023—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings
  • C10M2207/026—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings with tertiary alkyl groups
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
  • C10M2207/10—Carboxylix acids; Neutral salts thereof
  • C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
  • C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
  • C10M2207/28—Esters
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
  • C10M2207/28—Esters
  • C10M2207/281—Esters of (cyclo)aliphatic monocarboxylic acids
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
  • C10M2207/40—Fatty vegetable or animal oils
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
  • C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
  • C10M2209/08—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate type
  • C10M2209/084—Acrylate; Methacrylate
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
  • C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
  • C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
  • C10M2209/104—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing two carbon atoms only
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
  • C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
  • C10M2215/04—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms
  • C10M2215/042—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms containing hydroxy groups; Alkoxylated derivatives thereof
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2217/00—Organic macromolecular compounds containing nitrogen as ingredients in lubricant compositions
  • C10M2217/02—Macromolecular compounds obtained from nitrogen containing monomers by reactions only involving carbon-to-carbon unsaturated bonds
  • C10M2217/024—Macromolecular compounds obtained from nitrogen containing monomers by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to an amido or imido group
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
  • C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
  • C10M2223/04—Phosphate esters
  • C10M2223/041—Triaryl phosphates
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
  • C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
  • C10M2223/049—Phosphite
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
  • C10N2020/01—Physico-chemical properties
  • C10N2020/02—Viscosity; Viscosity index
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
  • C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
  • C10N2030/12—Inhibition of corrosion, e.g. anti-rust agents or anti-corrosives
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2040/00—Specified use or application for which the lubricating composition is intended
  • C10N2040/20—Metal working
  • C10N2040/24—Metal working without essential removal of material, e.g. forming, gorging, drawing, pressing, stamping, rolling or extruding; Punching metal
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2040/00—Specified use or application for which the lubricating composition is intended
  • C10N2040/20—Metal working
  • C10N2040/244—Metal working of specific metals
  • C10N2040/245—Soft metals, e.g. aluminum

Definitions

• the invention relates to a lubricating oil for use in hot-rolling oil for aluminum sheet.
• the invention also relates to a hot-rolling oil produced with the lubricating oil for use in hot-rolling oil.
• the invention also relates to a method for manufacturing a hot-rolled aluminum sheet with the hot-rolling oil. In the method for manufacturing a hot-rolled sheet, the hot-rolling oil is used, for example, in a rough rolling process in which strip rolling is performed.
• the term “aluminum sheet” of “for aluminum sheet”, which refers to use in an embodiment of the invention, is intended to include “pure aluminum sheet and/or aluminum alloy sheet.”
• an aluminum sheet is manufactured by a process including hot-rolling a slab, which has undergone melting, casting, facing, and homogenizing, into a sheet, then optionally subjecting the sheet to cold rolling, annealing, and conditioning steps (such as a step of slitting the sheet into a width of an appropriate product size and a reforming step for smooth flatness), and optionally performing a surface treatment process.
• the hot-rolling step is most important for the quality of the aluminum sheet product.
• the hot-rolling step is performed using a method including performing rough rolling with a reverse-type hot roughing mill (rougher) and then performing finish rolling with a tandem-type hot finish rolling mill (finisher) or a method including performing both rough rolling and finish rolling with a single rolling mill for both rough rolling and finish rolling.
• Hot-rolling oil is used in the form of an emulsion, because hot-rolling requires sufficient roll-cooling ability.
• Properties required of aluminum sheet hot-rolling oil include rolling lubricity, roll coating properties, sheet surface quality, emulsion stability, iron corrosion protection, etc.
• general aluminum sheet hot-rolling oil is used in the form of an emulsion which is prepared by mixing mineral oil as lubricating base oil with an oiliness improver such as a fatty acid, natural oil and fat, or a fatty acid ester, and other additives such as an extreme-pressure agent, an anticorrosive, and an antioxidant, and emulsifying the mixture generally with an anionic surfactant.
• Patent Document 1 a hot-rolling oil composition including a combination of a specific lubricating oil component and a specific water-soluble cationic polymer compound.
• Patent Document 2 a hot-rolling oil in which a specific lubricating oil component is used in combination with an anionic surfactant and an nonionic surfactant.
• Patent Document 1 JP No. 2869850
• Patent Document 2 JP No. 2990021
• a proper structure should be formed in the hot-rolling process so that a proper structure can be formed in final products.
• the hot-rolling conditions become severe, because high reduction techniques or high strain rate techniques or the like are required as compared with conventional techniques, and therefore surface anomalies such as seizing tend to be more likely to occur due to insufficient lubricity. Therefore, the hot-rolling oil to be used is required to have higher lubricity than conventional oils.
• the lubricity of hot-rolling oil can be improved, a reduction in the number of rough hot-rolling passes or an increase in productivity by increasing the rolling speed can be expected even using high-Mg aluminum alloy sheets (5xxx aluminum alloys such as 5182 aluminum alloy for beverage can lids), which have high deformation resistance and therefore conventionally make it difficult to reduce the number of rough hot-rolling passes due to insufficient lubricity.
• high-Mg aluminum alloy sheets 5xxx aluminum alloys such as 5182 aluminum alloy for beverage can lids
• the amount of a fatty acid which is one of the lubricating oil components and serves as an oiliness improver, may be increased.
• the content of the fatty acid in the hot-rolling oil composition is increased to 15 mass % or more, a problem will occur in which the fatty acid has considerably high corrosiveness, and there will be a further problem in which metal soap, which is a high-viscosity material, is produced as rolling proceeds, so that the area around the rolling mill is soiled with the metal soap.
• Patent Document 2 proposes a technique to improve rolling lubricity with no degradation in iron corrosion protection, in which hot-rolling oil with improved rolling lubricity is prepared using a relatively large amount of natural oil and fat and/or a synthetic ester so that the content of a fatty acid can be limited.
• hot-rolling oil with improved rolling lubricity is prepared using a relatively large amount of natural oil and fat and/or a synthetic ester so that the content of a fatty acid can be limited.
• an increase in rolling lubricity may lead to reductions in biting performance and operating performance.
• the proposed technique does not improve the surface quality of aluminum alloy sheets.
• An object of the invention is to provide a lubricating oil for use in hot-rolling oil for aluminum sheet, which provides a high level of rolling lubricity, iron corrosion protection and biting performance and makes it possible to obtain a rolled aluminum sheet with high sheet surface quality, even under severe hot-rolling conditions where the reduction and/or the strain rate is set high as compared with conventional processes.
• Another object of the invention is to provide a hot-rolling oil produced with the lubricating oil for use in hot-rolling oil.
• a further object of the invention is to provide a method for manufacturing a hot-rolled aluminum sheet with the hot-rolling oil.
• the invention is directed to a lubricating oil for use in hot-rolling oil for aluminum sheet, including:
• R 1 represents a hydrogen atom or a methyl group
• R 2 and R 3 represent the same or different alkyl groups of 1 to 3 carbon atoms
• A represents —NH—
• m represents an integer of 1 to 3
• the organic acid salt of the copolymer has a weight average molecular weight of 10,000 to 1,000,000
• the mass ratio of the component (c) to the component (d) is 1/0.6 to 1/1.
• the invention is also directed to an aluminum sheet hot-rolling oil including the above lubricating oil for use in hot-rolling oil and water.
• the invention is also directed to a method for manufacturing a hot-rolled sheet, including a step of hot-rolling an aluminum sheet in the presence of the above aluminum sheet hot-rolling oil.
• the hot-rolling oil produced with the lubricating oil for use in hot-rolling oil for aluminum sheet of the invention provides a high level of rolling lubricity and iron corrosion protection, maintains biting performance, and makes it possible to obtain a rolled aluminum sheet with high sheet surface quality, even under severe hot-rolling conditions where the reduction and/or the strain rate is set high as compared with conventional processes.
• the hot-rolling oil composition disclosed in Patent Document 1 also contains components similar to those of the lubricating oil for use in hot-rolling oil of the invention.
• the hot-rolling oil composition disclosed in Patent Document 1 does not completely satisfy the requirements for the recent demand for high quality and low cost products under severe hot-rolling conditions where the reduction and/or the strain rate is set high for the production of high quality and low cost products, although it can somewhat ensure both rolling lubricity and sheet surface quality under conventional aluminum sheet hot-rolling conditions.
• the amount of an oil and fat or a synthetic ester may be increased so that rolling lubricity can be improved.
• the phosphorus-containing extreme-pressure agent can increase the sheet surface quality with no increase in rolling lubricity, but the phosphorus-containing extreme-pressure agent is expensive and therefore cannot be used in a large amount.
• the fatty acid is effective for rolling lubricity and sheet surface quality, but it degrades iron corrosion protection when used in a large amount.
• the lubricating oil for use in hot-rolling oil of the invention contains components similar to those of the hot-rolling oil composition disclosed in Patent Document 1.
• the content of the oil and fat or the synthetic ester and the content of the phosphorus-containing extreme-pressure agent or the like are not increased, whereas the content of the oil and fat or the synthetic ester is controlled to be equal to or slightly higher than the content of the phosphorus-containing extreme-pressure agent, so that the lubricating oil for use in hot-rolling oil of the invention can ensure both rolling lubricity and sheet surface quality and further provide a satisfactory level of iron corrosion protection and biting performance even under severe hot-rolling conditions where the reduction and/or the strain rate is set high for the production of aluminum sheets with high level characteristics, which have been demanded in recent years.
• the mineral oil as the component (a) is typically a spindle oil, a machine oil, a turbine oil, a cylinder oil, a neutral oil, or the like. In view of heat resistance and rolling lubricity, these mineral oils are more preferably paraffinic mineral oils.
• the mineral oil to be used has a viscosity of 80 mm 2 /second or less at 40° C. If the viscosity exceeds 80 mm 2 /second, sheet surface quality may be reduced.
• the component (a) is a base oil of the lubricating oil for use in hot-rolling oil of the invention.
• the component (a) to be used may be a single oil or a combination of two or more oils.
• the content of the component (a) in the whole of the lubricating oil for use in hot-rolling oil is 88.8 mass % or less, it is preferably from 51 to 88.8 mass %, more preferably from 60 to 85 mass %, even more preferably from 65 to 80 mass % in view of rolling lubricity, iron corrosion protection, sheet surface quality, or biting performance.
• the fatty acid having 10 to 22 carbon atoms as the component (b) may be capric acid, lauric acid, stearic acid, isostearic acid, oleic acid, erucic acid, palm oil fatty acid, or the like.
• the fatty acid preferably has 10 to 20 carbon atoms, more preferably 13 to 20 carbon atoms, further the fatty acid is preferably an unsaturated or branched fatty acid having 13 to 20 carbon atoms.
• the component (b) acts as an oiliness improver, which may be a single fatty acid or a combination of two or more fatty acids.
• oleic acid and isostearic acid are preferred, and oleic acid is more preferred, because they are liquid and non-precipitable at room temperature.
• the content of the component (b) in the whole of the lubricating oil for use in hot-rolling oil of the invention is from 1 to 14 mass %, preferably from 2 to 12 mass %, more preferably from 4 to 10 mass %. Controlling the content of the component (b) in the above range is preferred in view of rolling lubricity, emulsion stability, iron corrosion protection, or sheet surface quality.
• the oil and fat and/or a synthetic ester is used as the component (c).
• the oil and fat is a naturally occurring ester, and the synthetic ester is an artificially produced ester.
• the oil and fat include animal and vegetable oils and fats such as whale oil, beef tallow, lard, rapeseed oil, castor oil, palm oil, and coconut oil.
• the synthetic ester may be a synthetic ester (1) derived from a fatty acid and a monohydric or polyhydric alcohol.
• the fatty acid may be a fatty acid having 10 to 22 carbon atoms, examples of which include those listed for the component (b) and fatty acids derived from the oils and fats.
• the monohydric alcohol may be a monohydric fatty alcohol having 1 to 22 carbon atoms.
• a fatty alcohol having 1 to 15 carbon atoms is preferred, and a fatty alcohol having 1 to 8 carbon atoms is more preferred.
• the polyhydric alcohol include ethylene glycol, trimethylolpropane, pentaerythritol, and glycerin.
• the synthetic ester (1) is preferably a fatty acid monoester, examples of which include methyl caprate, butyl stearate, laurate oleate, 2-ethylhexyl erucate, pentaerythritol monooleate, and glycerin monooleate.
• the synthetic ester may also be a synthetic ester (2) derived from a fatty alcohol and a monobasic or polybasic acid.
• the fatty alcohol may be a fatty alcohol having the same number of carbon atoms as the fatty acid having 10 to 22 carbon atoms. In view of sheet surface quality, a fatty alcohol having 10 to 20 carbon atoms is preferred, and a fatty alcohol having 12 to 18 carbon atoms is more preferred.
• the polybasic acid include phthalic acid, trimellitic acid, adipic acid, and sebacic acid.
• Examples of the synthetic ester (2) include dilauryl phthalate, tri-2-ethylhexyl trimellitate, diisodecyl adipate, and dioleyl sebacate.
• the component (c) to be used may be a single ester or a combination of two or more esters.
• the component (c) is preferably the synthetic ester, more preferably the synthetic ester (1), even more preferably a fatty acid monoester, still more preferably butyl stearate.
• the component (c) acts as an oiliness improver, and the content of the component (c) in the whole of the lubricating oil for use in hot-rolling oil of the invention is preferably from 5 to 15 mass %, more preferably from 6 to 15 mass %. Controlling the content of the component (c) in the above range is preferred in view of rolling lubricity, sheet surface quality, or biting performance.
• An extreme-pressure agent provides rolling lubricity without reducing the coefficient of friction during rolling.
• the phosphorus-containing extreme-pressure agent as the component (d) include alkyl or alkenyl phosphates or alkyl or alkenyl phosphites.
• the phosphorus-containing extreme-pressure agent is preferably an alkyl or alkenyl phosphate or an alkyl or alkenyl phosphite.
• the alkyl or alkenyl group of the phosphate or the phosphite may have 4 to 18 carbon atoms, and examples of the phosphate and the phosphite include dibutyl phosphate, monooctyl phosphate, trioleyl phosphate, tricresyl phosphate, tributyl phosphite, diisooctyl phosphite, trioleyl phosphite, and triisooctyl phosphite.
• the number of the carbon atoms is preferably from 4 to 15, more preferably from 4 to 8.
• the phosphate or phosphite may be a monoester, diester or triester.
• an alkyl or alkenyl acid phosphate or an alkyl or alkenyl acid phosphite, which is a triester is preferred.
• the component (d) to be used may be a single agent or a combination of two or more agents.
• the content of the component (d) in the whole of the lubricating oil for use in hot-rolling oil of the invention is preferably from 5 to 10 mass %, more preferably from 6 to 10 mass %, even move preferably from 8 to 10 mass %. Controlling the content of the component (d) in the above range is preferred in view of rolling lubricity or sheet surface quality.
• the component (c) and the component (d) are used in a component (c)/component (d) mass ratio of 1/0.6 to 1/1.
• the mass ratio is preferably 1/0.7 to 1/1, more preferably 1/0.8 to 1/1. Controlling the ratio of the component (c) to the component (d) in the above range is preferred in view of sheet surface quality and biting performance.
• the polyoxyethylene alkyl amine as the component (e) may be a compound represented by formula (3): R 5 —NH-(EO) n —H or formula (4): H-(EO) n1 —NR 6 -(EO) n2 —H, wherein R 5 and R 6 each represent an alkyl group of 10 to 18 carbon atoms, preferably an alkyl group of 10 to 16 carbon atoms, more preferably an alkyl group of 12 to 14 carbon atoms in view of emulsion stability and iron corrosion protection, EO represents an oxyethylene group, n, n1, and n2 each represent an average addition mole number of EO, n is preferably from 2 to 10, more preferably from 2 to 8, even more preferably from 2 to 5 in view of emulsion stability and iron corrosion protection, n1 and n2 are each 1 or more, and n1+n2 is preferably from 2 to 10, more preferably from 2 to 8, even more preferably from 2 to 5 in view of emulsion stability
• the component (e) acts as an anticorrosive.
• the component (e) to be used may be a single compound or a combination of two or more compounds.
• the component (e) is preferably polyoxyethylene lauryl amine.
• the content of the component (e) in the whole of the lubricating oil for use in hot-rolling oil of the invention is from 0.1 to 1 mass %, preferably from 0.2 to 1 mass %, more preferably from 0.4 to 1 mass %. Controlling the content of the component (e) in the above range is preferred in view of emulsion stability or iron corrosion protection.
• the component (e) preferably has an HLB of 6 to 13, more preferably 10 to 13.
• the organic acid salt of the copolymer as the component (f) is an organic salt composed of a copolymer of an amine monomer represented by formula (1), (meth)acrylamide, and a (meth)acrylic acid salt.
• (meth)acrylamide refers to acrylamide and/or methacrylamide
• (meth)acrylic acid salt refers to acrylic acid salt and/or methacrylic acid salt.
• (meth) has the same meaning as mentioned above.
• the molar ratio (amine monomer:(meth)acrylamide:(meth)acrylic acid salt) is preferably 50-90:0.1-20:10-50, more preferably 59-90:1-10:10-30, even more preferably 69-90:1-5:10-25 in view of emulsion stability.
• Examples of the amine monomer represented by formula (1) include dimethylaminoethyl(meth)acrylamide, dimethylaminopropyl(meth)acrylamide, and diethylaminomethyl(meth)acrylamide.
• dimethylaminopropylmethacrylamide and diethylaminopropylacrylamide are preferred in view of emulsion stability.
• Examples of the (meth)acrylic acid salt include (meth)acrylic acid alkali metal salt such as sodium salt of (meth)acrylic acid and potassium salt of (meth)acrylic acid; and (meth)acrylic acid organic amine salts, such as monoethanolamine salt of (meth)acrylic acid, diethanolamine salt of (meth)acrylic acid, and triethanolamine salt of (meth)acrylic acid.
• (meth)acrylic acid alkali metal salt such as sodium salt of (meth)acrylic acid and potassium salt of (meth)acrylic acid
• (meth)acrylic acid organic amine salts such as monoethanolamine salt of (meth)acrylic acid, diethanolamine salt of (meth)acrylic acid, and triethanolamine salt of (meth)acrylic acid.
• the organic acid used to form the organic acid salt of the copolymer as the component (f) includes a compound represented by formula (2): R 4 COOH, which provides R 4 COO ⁇ to form an organic acid salt with the amino group of the amine monomer represented by formula (1).
• R 4 in the formula include an alkyl group of 1 to 5 carbon atoms, a hydroxyalkyl group of 1 to 5 carbon atoms, a carboxyalkyl group with an alkyl moiety of 1 to 5 carbon atoms, and a carboxyl group.
• R 4 is preferably a methyl group or a hydroxyalkyl group of 1 to 5 carbon atoms.
• R 4 COO— examples include acetate ion, propionate ion, butyrate ion, valerate ion, caproate ion, glycolate ion, lactate ion, hydroacrylate ion, oxalate ion, malonate ion, succinate ion, glutarate ion, and adipate ion.
• acetate ion, glycolate ion, lactate ion, and hydroacrylate ion are preferred, and acetate ion and glycolate ion are more preferred in view of emulsion stability.
• the organic acid salt of the copolymer as the component (f) preferably has a weight average molecular weight in the range of 10,000 to 1,000,000, more preferably in the range of 30,000 to 300,000.
• the weight average molecular weight may be determined by a process including adding 10 ml of 0.5 M sodium hydroxide to 1 g of the organic acid salt of the copolymer, allowing the mixture to stand at 95° C. for 2 hours to perform hydrolysis, then measuring the molecular weight by GPC (gel permeation chromatography), and calculating the molecular weight before the hydrolysis based on the result.
• GPC gel permeation chromatography
• the organic acid salt of the copolymer as the component (f) may be obtained by neutralizing the produced copolymer with the organic acid of formula (2) or by previously neutralizing the amine monomer represented by formula (1) with the organic acid of formula (2) in the production of the copolymer.
• the component (f) to be used may be a single salt or a combination of two or more salts.
• the content of the component (f) in the whole of the lubricating oil for use in hot-rolling oil of the invention is from 0.1 to 10 mass %, preferably from 0.4 to 5 mass %, more preferably from 0.6 to 3 mass %. Controlling the content of the component (f) in the above range is preferred in view of rolling lubricity or sheet surface quality.
• the lubricating oil for use in hot-rolling oil of the invention may further contain known additives such as an anticorrosive, an antioxidant, and an emulsifying agent for improving initial emulsifiability.
• anticorrosive examples include alkenyl succinate and derivatives thereof, fatty acids such as oleic acid, esters such as sorbitan monooleate, and other amines.
• the content of the anticorrosive in the whole of the lubricating oil for use in hot-rolling oil of the invention is preferably from 0.2 to 2 mass %, more preferably from 0.5 to 1.5 mass %.
• antioxidants examples include phenolic compounds such as 2,4-di-tert-butyl-p-cresol and aromatic amines such as phenyl- ⁇ -naphthylamine.
• the antioxidant is preferably added in an amount of 0.2 to 5 mass %, more preferably 0.5 to 1.5 mass %, based on the total mass of the lubricating oil for use in hot-rolling oil of the invention.
• emulsifying agent examples include anionic surfactants such as triethanolamine salt of oleic acid and sodium petroleum sulfonate and nonionic surfactants such as polyoxyethylene lauryl ether.
• anionic surfactants such as triethanolamine salt of oleic acid and sodium petroleum sulfonate
• nonionic surfactants such as polyoxyethylene lauryl ether.
• the content of the emulsifying agent is preferably 2 mass % or less, more preferably 1 mass % or less, based on the total mass of the lubricating oil for use in hot-rolling oil of the invention.
• the lubricating oil for use in hot-rolling oil of the invention is diluted with water when used to form a hot-rolling oil.
• the water dilution is a hot-rolling oil emulsion (O/W type emulsion) containing the lubricating oil for use in hot-rolling oil of the invention dispersed in water.
• the dilution rate with water to form the water dilution is not restricted.
• the concentration of the lubricating oil for use in hot-rolling oil of the invention in the water dilution is preferably from 1 to 30 mass %, more preferably from 2 to 15 mass %.
• the emulsion particles preferably has a volume average particle size of 1 to 20 ⁇ m, more preferably 5 to 15 ⁇ m in view of rolling lubricity and emulsion stability.
• the hot-rolling oil of the invention is to be used in the process of rolling an aluminum sheet with a hot-rolling mill in a method for manufacturing a hot-rolled sheet.
• the rolling process may be performed using conventional methods (see for example “Keikinzoku no Kenkyu to Gijutsu no Ayumi,” (History of Research and Technology of Light Metals) published on Nov. 30, 1991 by The Japan Institute of Light Metals), examples of which include a rough rolling process in which strip rolling is performed, and a finish rolling process in which coil rolling is performed.
• a conventionally-used rolling oil supply system see for example “Keikinzoku no Kenkyu to Gijutsu no Ayumi,” (History of Research and Technology of Light Metals) published on Nov.
• the method of the invention for manufacturing a hot-rolled sheet includes the step of hot-rolling an aluminum sheet in the presence of the aluminum sheet hot-rolling oil of the invention.
• the method described above may be used to supply the aluminum sheet hot-rolling oil of the invention to the hot-rolling step.
• Hot-rolling oils (O/W type emulsions) with a concentration of 2 mass % were prepared under the conditions described below using water and different lubricating oils for use in hot-rolling oil with the compositions shown in Table 1 for hot-rolling oils.
• the hot-rolling oil of Comparative Example 3 corresponds to the No. 3 blend in Examples according to the invention disclosed in Patent Document 1.
• M-type homomixer manufactured by PRIMIX Corporation
• Measuring instrument Coulter Counter Multisizer (manufactured by Beckman Coulter, Inc.)
• Dilution conditions 30 ⁇ l was taken from each of the prepared hot-rolling oils and diluted to 100 ml with a dilution solution for blood (manufactured by Wako Pure Chemical Industries, Ltd.), when the volume average particle size was measured.
• the hot-rolling oils were subjected to the test examples described below in which lubricity in rolling of an aluminum alloy sheet, sheet surface quality, iron corrosion protection, and biting performance were evaluated.
• the hot-rolling oil emulsion was supplied to the hot-rolling process by spraying it on the rolling mill roll.
• Aluminum alloy material (A5182, 40 mm wide ⁇ 700 mm long ⁇ 3.3 mm thick)
• Pre-rolling A pure aluminum material (A1100, 40 mm wide ⁇ 700 mm long ⁇ 3.5 mm thick) was previously rolled at a rolling reduction of 70%.
• Spray rate 2 L/minute ⁇ one for each of the upper and lower parts, 200 kPa
• the rolling load at a rolling reduction of 45% was used to evaluate the rolling lubricity.
• the test was performed four times using each hot-rolling oil, and the average was used as an index of the rolling lubricity. When the rolling load is 430 MPa or less, the rolling lubricity is good.
• the results are shown in Table 1.
• the rolling load indicates the surface pressure calculated from: the average of loads measured with a load cell in the two-high rolling mill during the rolling; and the contact area calculated from the sheet thicknesses before and after the rolling.
• the coefficient of friction was determined by a process including performing a rolling process using a work roll with projection marks, measuring the transferred mark pitch (the distance between the marks) on the rolled material (the surface of the rolled sheet), calculating a forward slip from the distance L1 between the specific projection marks on the rolling mill roll, and calculating the coefficient of friction from the formulae below.
• ⁇ 0.5 ⁇ [( h 1 ⁇ h 2)/ R 2] 0.5 / ⁇ 1 ⁇ 2 ⁇ [(1 ⁇ r ) ⁇ / r] 0.5 ⁇ ,
• ⁇ represents the coefficient of friction
• h1 the sheet thickness (mm) before rolling
• h2 the sheet thickness (mm) after rolling
• R2 the flattened roll diameter (mm)
• r the rolling reduction and ⁇ the forward slip.
• R 2 R ⁇ 1+16 ⁇ (1 ⁇ 2 ) ⁇ P/[ ⁇ E ⁇ b ⁇ ( h 1 ⁇ h 2)] ⁇ ,
• R represents the roll diameter, ⁇ the Poisson's ratio, P the rolling load, E the Young's modulus, and b the sheet width.
• ⁇ (L1 ⁇ L2)/L1
• L1 represents the distance (mm) between the projections (marks) on the rolling mill roll
• L2 represents the distance (mm) between the marks transferred onto the rolled sheet.
• ⁇ and E are 0.3 and 20,000, respectively, which are values specific to iron.
• Test Example 1 The rolled sheet obtained in Test Example 1 was subjected to an alumite treatment under the conditions shown below, and the surface of the rolled sheet after the alumite treatment was measured for whiteness degree, when the sheet surface quality was evaluated.
• the test was performed four times using each hot-rolling oil, and the average was used as an index of the sheet surface quality. When the whiteness degree shown below is evaluated to be 4 or more, the sheet surface quality is good.
• Table 1 The results are shown in Table 1.
• Treatment solution An aqueous 15 w/v % sulfuric acid solution
• Treatment temperature 20° C.
• Measuring equipment spectroscopic colorimeter SE-2000 (manufactured by NIPPON DENSHOKU INDUSTRIES CO., LTD.)
• Each prepared hot-rolling oil was subjected to a corrosion test under the conditions shown below, and the corrosion rate (mg/m 2 ⁇ day) was used to evaluate the iron corrosion protection.
• the test was performed four times using each hot-rolling oil, and the average was used as an index of the iron corrosion protection. When the corrosion rate is 200 mg/m 2 ⁇ day or less, the iron corrosion protection is good.
• Table 1 The corrosion rate was determined by a process including measuring the mass of the test piece with a precision balance before and after the test and calculating the corrosion rate from the reduction in the mass and the area of the test piece.
• Test piece SS-400 sheet (3 mm thick ⁇ 50 mm ⁇ 50 mm)
• Pretreatment The test piece was polished with #240 polishing paper and then degreased with a solvent.
• test piece was entirely immersed in each hot-rolling oil under stirring with an M-type homomixer at 6,000 r/minute.
• Mineral oil A paraffinic mineral oil (with a kinematic viscosity of 30 mm 2 /second at 40° C.) (Super Oil K32 manufactured by Nippon Oil Corporation)
• Mineral oil B Naphthene-based mineral oil (with a kinematic viscosity of 30 mm 2 /second at 40° C.) (Diana Fresia N-28 manufactured by Idemitsu Kosan Co., Ltd.)
• Fatty acid A Oleic acid (LUNAC O-P manufactured by Kao Corporation)
• Oil and fat A Palm oil (RPO ACE manufactured by UEDA OILS AND FATS MFG CO., LTD.)
• Oil and fat B Lard (reagent manufactured by Kishida Chemical Co., Ltd.)
• Ester A Butyl stearate (EXCEPARL BS manufactured by Kao Corporation)
• Ester B Dilaurly phthalate (VINYCIZER 124 manufactured by Kao Corporatoin)
• Ester C Trimethylolpropane coconut oil fatty acid triester (ADDLUBE E-124 manufactured by Kao Corporation)
• Extreme-pressure agent A Tricresyl phosphate (DURAD TCP manufactured by AJINOMOTO CO., INC.)
• Extreme-pressure agent B Triisooctyl phosphite (JP-308E manufactured by Johoku Chemical Co., Ltd.)
• Organic acid salt of copolymer A A product of neutralization of a copolymer of dimethylaminopropylacrylamide/acrylamide/sodium salt of acrylic acid (80/5/15) with acetic acid (with a weight average molecular weight of 100,000 synthesized in laboratory at a reaction temperature of 50° C. using a polymerization initiator and monomers manufactured by Wako Pure Chemical Industries, Ltd.)
• Organic acid salt of copolymer B A product of neutralization of a copolymer of dimethylaminopropylmethacrylamide/acrylamide/sodium salt of acrylic acid (84/1/15) with glycolic acid (with a weight average molecular weight of 50,000 synthesized in laboratory at a reaction temperature of 50° C. using a polymerization initiator and monomers manufactured by Wako Pure Chemical Industries, Ltd.)
• Rust-preventive agent hexadecenyl succinate
• L-ASA manufactured by Kao Corporation
• Additive B Antioxidant (2,6-di-tert-butyl-p-cresol) (YOSHINOX BHT manufactured by API Corporation)
• Additive D Triethanolamine (reagent manufactured by Wako Pure Chemical Industries, Ltd.)
• Additive E Coconut oil-reduced alcohol (KALCOL 2455 manufactured by Kao Corporation)
• Table 1 shows that hot-rolling oil emulsions prepared using lubricating oils for use in hot-rolling oil of the invention provide a satisfactory level of lubricity, sheet surface quality and iron corrosion protection in rolling of aluminum alloy sheets and a satisfactory level of performance in biting pure aluminum sheets and that comparative products that do not satisfy the features of the invention have a problem with at least one of the performances. Therefore, the lubricating oil for use in hot-rolling oil of the invention would also be effective for lubricity, sheet surface quality and iron corrosion protection in rolling of pure aluminum sheets and effective for performance in biting aluminum alloy sheets.

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• 2009
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