WO2011122568A1 - 金属加工用潤滑油組成物 - Google Patents
金属加工用潤滑油組成物 Download PDFInfo
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- WO2011122568A1 WO2011122568A1 PCT/JP2011/057658 JP2011057658W WO2011122568A1 WO 2011122568 A1 WO2011122568 A1 WO 2011122568A1 JP 2011057658 W JP2011057658 W JP 2011057658W WO 2011122568 A1 WO2011122568 A1 WO 2011122568A1
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- 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
- C10M129/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen
- C10M129/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of less than 30 atoms
- C10M129/68—Esters
- C10M129/72—Esters of polycarboxylic acids
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
- C10M169/04—Mixtures of base-materials and additives
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M101/00—Lubricating compositions characterised by the base-material being a mineral or fatty oil
- C10M101/02—Petroleum fractions
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
- C10M105/08—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing oxygen
- C10M105/22—Carboxylic acids or their salts
- C10M105/28—Carboxylic acids or their salts having only one carboxyl group bound to a carbon atom of a six-membered aromatic ring
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
- C10M105/08—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing oxygen
- C10M105/32—Esters
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
- C10M105/08—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing oxygen
- C10M105/32—Esters
- C10M105/34—Esters of monocarboxylic acids
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
- C10M105/08—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing oxygen
- C10M105/32—Esters
- C10M105/38—Esters of polyhydroxy compounds
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
- C10M105/08—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing oxygen
- C10M105/32—Esters
- C10M105/40—Esters containing free hydroxy or carboxyl groups
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
- C10M105/08—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing oxygen
- C10M105/32—Esters
- C10M105/42—Complex esters, i.e. compounds containing at least three esterified carboxyl groups and derived from the combination of at least three different types of the following five types of compound: monohydroxy compounds, polyhydroxy compounds, monocarboxylic acids, polycarboxylic acids and hydroxy carboxylic acids
- C10M105/44—Complex esters, i.e. compounds containing at least three esterified carboxyl groups and derived from the combination of at least three different types of the following five types of compound: monohydroxy compounds, polyhydroxy compounds, monocarboxylic acids, polycarboxylic acids and hydroxy carboxylic acids derived from the combination of monocarboxylic acids, dicarboxylic acids and dihydroxy compounds only and having no free hydroxy or carboxyl groups
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- C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
- C10M105/50—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing halogen
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- C10M129/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen
- C10M129/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of less than 30 atoms
- C10M129/04—Hydroxy compounds
- C10M129/06—Hydroxy compounds having hydroxy groups bound to acyclic or cycloaliphatic carbon atoms
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- 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
- C10M2203/102—Aliphatic fractions
- C10M2203/1025—Aliphatic fractions used as base material
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- 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
- C10M2207/021—Hydroxy compounds having hydroxy groups bound to acyclic or cycloaliphatic carbon atoms
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- 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
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- 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
- C10M2207/282—Esters of (cyclo)aliphatic oolycarboxylic acids
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- 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
- C10M2207/285—Esters of aromatic polycarboxylic acids
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- 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
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- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/08—Resistance to extreme temperature
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- 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
- C10N2040/243—Cold working
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- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/20—Metal working
- C10N2040/244—Metal working of specific metals
- C10N2040/246—Iron or steel
Definitions
- the present invention relates to a lubricating oil composition for metal working used for rolling or the like.
- the roll having a large surface roughness is replaced with a roll having a small surface roughness for finish rolling. Therefore, finish rolling is started from a state without roll coating, and the sheet gloss is low until roll coating is produced. Therefore, if the production
- the rolling oil is also required to be excellent in rolling properties, that is, to obtain a high pressure reduction rate under a low rolling load and not to cause seizure (heat scratch) under severe conditions.
- seizure heat scratch
- the material is hard, so seizure resistance to rolling oil is also required, and the design of the material surface is also important for its use, and high glossiness is strongly demanded. It has been.
- a cold rolling oil for stainless steel containing a diester composed of an aliphatic linear dicarboxylic acid having 6 to 10 carbon atoms and an alcohol having 3 to 5 carbon atoms has been proposed (see Patent Document 1). Further, 0.5 to 30% by mass of a diester obtained from an aliphatic dicarboxylic acid having a main skeleton of 12 to 28 carbon atoms and an aliphatic alcohol having 1 to 9 carbon atoms, and 0.01 to 5.0 of a phosphorus compound.
- a cold rolling oil composition containing mass% has been proposed (see Patent Document 2).
- the cold rolled oil for stainless steel described in Patent Document 1 not only has a long rolling distance for the production of roll coating, but also does not necessarily have sufficient seizure resistance. Moreover, in the cold-rolled oil composition described in Patent Document 2, seizure resistance is recognized, but a slightly rolling distance is required to generate roll coating.
- An object of the present invention is to provide a lubricating oil composition for metal working that can impart high gloss to a rolled sheet at a short rolling distance and is excellent in seizure resistance.
- a lubricating oil composition for metal working comprising a diester compound represented by the following formula (1) in a base oil.
- R 1 OCO-Z-COOR 2 (1) (In the formula, R 1 and R 2 are each independently an alkyl group having 1 to 18 carbon atoms, and Z is an alkylene group having 10 to 12 carbon atoms.)
- the blending amount of the diester compound of the formula (1) is 0.1% by mass or more and 30% by mass or less based on the total amount of the composition.
- Lubricating oil composition for metal working [4] A lubricating oil composition for metal working, wherein the lubricating oil composition for metal working is further blended with an oily agent. [5] A lubricating oil composition for metal working, wherein the composition is for cold rolling. [6] A lubricating oil composition for metalworking as described above, wherein the composition is for stainless steel.
- the lubricating oil composition for metalworking of the present invention is formed by blending a predetermined diester compound with a base oil, it has excellent seizure resistance and can impart high gloss to a rolled plate at a short rolling distance. Therefore, it is useful for cold rolling of hard metal materials such as stainless steel.
- the present composition either mineral oil or synthetic oil can be used as the base oil.
- mineral oil various things can be mentioned. For example, distillate obtained by atmospheric distillation of paraffinic crude oil, intermediate crude oil or naphthenic crude oil, or by distilling the residual oil of atmospheric distillation under reduced pressure, or by refining it by a conventional method
- the obtained refined oil include solvent refined oil, hydrorefined oil, dewaxed oil, and clay-treated oil.
- Synthetic oils include poly ⁇ -olefins (PAO) having 8 to 14 carbon atoms, olefin copolymers (OCP, such as ethylene-propylene copolymers), branched olefins such as polybutene and polypropylene, and hydrides thereof. Furthermore, ester compounds such as polyol esters (trimethylolpropane fatty acid ester, pentaerythritol fatty acid ester, etc.), alkylbenzene, and the like can be used.
- the base oil one kind of the above-described mineral oil or synthetic oil may be used, or two or more kinds may be used in combination. You may mix and use mineral oil and synthetic oil.
- Such a base oil preferably has a kinematic viscosity at 40 ° C. in the range of 1 mm 2 / s to 30 mm 2 / s, and more preferably in the range of 4 mm 2 / s to 20 mm 2 / s. If this kinematic viscosity is less than 1 mm 2 / s, the flash point is low, and there is a risk of increased risk of fire due to ignition. On the other hand, if it exceeds 30 mm 2 / s, oil pits are generated on the surface of the rolled plate, resulting in glossiness. There is also a possibility that problems such as a decrease in winding and a winding deviation occur.
- R 1 and R 2 are each independently an alkyl group having 1 to 18 carbon atoms.
- the carbon number of R 1 or R 2 is 19 or more, the gloss of the rolled plate may be lowered.
- the number of carbon atoms of R 1 or R 2 is preferably 4 or less, and in particular, the number of carbon atoms of R 1 and R 2 is preferably 4 or less.
- Examples of such an alkyl group include a methyl group, an ethyl group, a propyl group, and a butyl group.
- the propyl group and the butyl group may be linear or branched. Among these, the case where R 1 and R 2 are both methyl groups is most preferable in terms of seizure resistance.
- Z is an alkylene group having 10 to 12 carbon atoms.
- the carbon number of Z is an alkylene group in this range, the seizure resistance is good, and roll coating is easily generated during rolling, and the gloss of the rolled plate is also good.
- Z may be a straight chain or may be branched, but a straight chain is more preferable in terms of imparting gloss. Further, from the viewpoint of seizure resistance and roll coating formation, it is most preferable that the carbon number of Z is 10 and R 1 and R 2 are both methyl groups.
- the blending amount of the diester represented by the formula (1) is 0.1% by mass or more and 40% by mass or less based on the total amount of the composition from the viewpoints of seizure resistance and ease of forming a roll coating. It is preferable.
- a more preferable blending amount of the diester is 1% by mass or more and 30% by mass or less, more preferably 1% by mass or more and 20% by mass or less, and further preferably 3% by mass or 20% by mass based on the total amount of the composition. % Or less.
- an oily agent is further added to the composition.
- Monoesters and higher alcohols are preferably used as the oily agent blended in the present composition.
- the monoester is preferably a monoester having 13 to 48 carbon atoms.
- R 3 represents an alkyl group having 11 to 22 carbon atoms
- R 4 represents an alkyl group having 1 to 25 carbon atoms
- the total carbon number of R 3 and R 4 is 12 to 47.
- the more preferable carbon number of the monoester represented by the formula (2) is in the range of 13 or more and 36 or less.
- Specific examples of the monoester include methyl stearate, butyl stearate, octyl stearate, octyl palmitate and the like. Among these, from the viewpoint of contribution to seizure resistance and availability Most preferred is butyl stearate.
- one type of the above monoester may be used, or two or more types may be used in combination.
- the blending amount of the monoester in the rolling oil composition is preferably in the range of 0.5% by mass or more and 40% by mass or less, more preferably in the range of 3% by mass or more and 30% by mass or less based on the total amount of the composition. In particular, the range of 5% by mass or more and 20% by mass or less is most preferable. When the compounding amount of the monoester exceeds 40% by mass, roll slip may occur, and low temperature fluidity may be deteriorated.
- the higher alcohol is preferably an alcohol having 12 to 18 carbon atoms from the viewpoint of seizure resistance.
- Specific examples include various saturated alcohols or unsaturated alcohols, and both saturated alcohols and unsaturated alcohols can be used favorably.
- saturated alcohols include linear or branched dodecanol (eg, lauryl alcohol), linear or branched tridecanol, linear or branched tetradecanol, linear or branched pentadecanol, Examples thereof include linear or branched hexadecanol, and a mixture thereof.
- the unsaturated alcohol includes linear or branched decenol, linear or branched undecenol, linear or branched dodecenol, linear or branched tridecenol, linear or branched And tetradecenol, linear or branched pentadecenol, linear or branched hexadecenol, linear or branched heptadecenol, and linear or branched octadecenol.
- the proportion in the case where the above-mentioned higher alcohol is blended with the present composition is not particularly limited. More preferably, it is 3 mass% or more and 12 mass% or less.
- composition various additives shown below may be blended within a range that does not impair the effects of the invention. Specifically, surfactants, extreme pressure agents, antiwear agents, antioxidants, rust inhibitors, metal deactivators, antifoaming agents, and the like can be appropriately blended and used.
- Surfactant is used when the composition is dispersed in water and used as an emulsion.
- the surfactant include an anionic surfactant, a cationic surfactant, a nonionic surfactant, and an amphoteric surfactant.
- the anionic surfactant include alkylbenzene sulfonate and alpha olefin sulfonate.
- the cationic surfactant include quaternary ammonium salts such as alkyltrimethylammonium salts and dialkyldimethylammonium salts.
- the nonionic surfactant include ethers such as polyoxyalkylene alkyl ether and polyoxyalkylene alkylphenyl ether.
- the blending amount is preferably selected in the range of 0.01% by mass or more and 10% by mass or less based on the total amount of the composition.
- extreme pressure agents include sulfur compounds such as sulfurized olefins, dialkyl polysulfides, diarylalkyl polysulfides, diaryl polysulfides, phosphate esters, thiophosphate esters, phosphite esters, alkyl hydrogen phosphites, phosphate amine amine salts, Phosphorus compounds such as phosphoric ester amine salts are included.
- the blending amount is preferably 0.01% by mass or more and 10% by mass or less, more preferably 0.05% by mass or more and 5% by mass or less based on the total amount of the composition.
- antiwear agent examples include zinc dithiophosphate (ZnDTP), zinc dithiocarbamate (ZnDTC), molybdenum sulfide oxydithiophosphate (MoDTP), and molybdenum sulfide oxydithiocarbamate (MoDTC).
- ZnDTP zinc dithiophosphate
- ZnDTC zinc dithiocarbamate
- MoDTP molybdenum sulfide oxydithiophosphate
- MoDTC molybdenum sulfide oxydithiocarbamate
- antioxidants examples include amines such as alkylated diphenylamine, phenyl- ⁇ -naphthylamine, and alkylated- ⁇ -naphthylamine, phenols such as 2,6-di-t-butyl-p-cresol, and 2,6 -Sulfur-based compounds such as di-t-butyl-4- [4,6-bis (octylthio) -1,3,5-triazin-2-ylamino] phenol and dilaurylthiodipropionate.
- the compounding quantity is 0.05 mass% or more and 3 mass% or less on the basis of the total amount of the composition, and more preferably 0.2 mass% or more and 2 mass% or less.
- rust inhibitor examples include alkanolamines such as triethanolamine, petroleum sulfonates, alkylbenzene sulfonates, dinonylnaphthalene sulfonates, alkenyl succinic acid esters, and polyhydric alcohol esters.
- alkanolamines such as triethanolamine
- petroleum sulfonates such as triethanolamine
- alkylbenzene sulfonates such as triethanolamine
- alkylbenzene sulfonates such as triethanolamine
- dinonylnaphthalene sulfonates examples of the rust inhibitor
- alkenyl succinic acid esters examples include alkenyl succinic acid esters, and polyhydric alcohol esters.
- the blending amount of these rust preventives is preferably 0.01% by weight or more and 1% by weight or less, more preferably 0.05% by weight or more and 0.5% by weight, based on the total amount of the composition from the viewpoint of
- the metal deactivator examples include benzotriazole, tolyltriazole, thiadiazole, and imidazole compounds.
- the blending amount is preferably 0.01% by weight or more and 1% by weight or less, more preferably 0.01% by weight or more and 0.5% by weight or less, based on the total amount of the composition, from the viewpoint of blending effects. You can select a range.
- the antifoaming agent examples include silicone, fluorosilicol, and fluoroalkyl ether.
- the antifoaming agent is preferably selected in the range of 0.005% by mass or more and 0.1% by mass or less on the basis of the total amount of the composition from the viewpoint of balance between the defoaming effect and economy.
- the lubricating oil composition for metal working of the present invention can impart high gloss to a rolled sheet at a short rolling distance and is excellent in seizure resistance. It can be suitably used as a cold rolling oil.
- each component used for preparation of sample oil is as follows.
- Base Oil 40 ° C. kinematic viscosity using a paraffinic mineral oil two 7 mm 2 / s and 30 mm 2 / s, as 40 ° C. kinematic viscosity is 8 mm 2 / s adjusting the mixing ratio of these mineral oils did.
- Diester 1 In the diester of formula (1), R 1 and R 2 are both methyl groups, and Z is a linear alkylene group having 10 carbon atoms (dimethyl dodecanedioate).
- Diester 2 In the diester of formula (1), R 1 and R 2 are both methyl groups, and Z is a linear alkylene group having 12 carbon atoms (dimethyl tetradecandioate).
- Diester 3 Dimethyl ester of aliphatic dicarboxylic acid represented by the following chemical formula
- Diester 4 Diisononyl adipate (1.6) Diester 5: Diisodecyl adipate (1.7) Triester: Trimellitic acid and octanol triester (1.8) Oiliness agent: lauryl alcohol, butyl stearate (butyl stearate)
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Abstract
Description
そこで、炭素数6~10の脂肪族直鎖ジカルボン酸と、炭素数3~5のアルコールとから構成されるジエステルを含むステンレス用冷間圧延油が提案されている(特許文献1参照)。また、主骨格が炭素数12~28の脂肪族ジカルボン酸と、炭素数1~9の脂肪族アルコールとから得られたジエステル0.5~30質量%およびリン系化合物0.01~5.0質量%を含む冷間圧延油組成物が提案されている(特許文献2参照)。
〔1〕基油に、下記式(1)で示されるジエステル化合物を配合してなることを特徴とする金属加工用潤滑油組成物。
R1OCO-Z-COOR2 (1)
(式中、R1、R2は各々独立に炭素数1以上18以下のアルキル基であり、Zは炭素数が10以上12以下のアルキレン基である。)
〔2〕上述の金属加工用潤滑油組成物において、前記式(1)におけるZが直鎖構造であることを特徴とする金属加工用潤滑油組成物。
〔3〕上述の金属加工用潤滑油組成物において、前記式(1)のジエステル化合物の配合量が組成物全量基準で、0.1質量%以上、30質量%以下であることを特徴とする金属加工用潤滑油組成物。
〔4〕上述の金属加工用潤滑油組成物において、さらに油性剤を配合してなることを特徴とする金属加工用潤滑油組成物。
〔5〕上述の金属加工用潤滑油組成物において、該組成物が冷間圧延用であることを特徴とする金属加工用潤滑油組成物。
〔6〕上述の金属加工用潤滑油組成物において、該組成物がステンレス用であることを特徴とする金属加工用潤滑油組成物。
鉱油としては、種々のものを挙げることができる。例えば、パラフィン基系原油、中間基系原油あるいはナフテン基系原油を常圧蒸留するか、あるいは常圧蒸留の残渣油を減圧蒸留して得られる留出油、またはこれを常法により精製して得られる精製油、例えば、溶剤精製油、水素化精製油、脱ロウ処理油、および白土処理油等を挙げることができる。
本発明においては、基油として、前記した鉱油や合成油を1種用いてもよいし、2種以上組み合わせて用いてもよい。鉱油と合成油を混合して使用してもよい。
R1OCO-Z-COOR2 (1)
ここで、式中、R1、R2は各々独立に炭素数1以上18以下のアルキル基である。R1あるいはR2の炭素数が19以上であると、圧延板の光沢が低下するおそれがある。また、耐焼付性の観点より、R1あるいはR2の炭素数は4以下であることが好ましく、特にR1およびR2の炭素数がともに4以下であることが好ましい。このようなアルキル基としては、メチル基、エチル基、プロピル基、ブチル基があげられるが、プロピル基やブチル基は直鎖状であっても分枝状であってもよい。これらの中で、耐焼き付き性の点で最も好ましいのは、R1およびR2がともにメチル基の場合である。
モノエステルとしては、炭素数13以上48以下のモノエステルが好ましい。このモノエステルを、上述の式(1)のジエステルと組み合わせて用いることにより、耐焼き付き性と圧延板の光沢をさらに向上させることできる。また、このモノエステルを配合することにより、上述のジエステルの使用量を低減させることもできる。
このようなモノエステルとしては、例えば下記式(2)で示される脂肪族モノカルボン酸エステルを挙げることができる。
R3COOR4 (2)
式(2)で示されるモノエステルのより好ましい炭素数は13以上36以下の範囲である。該モノエステルの具体例としては、ステアリン酸メチル、ステアリン酸ブチル、ステアリン酸オクチル、パルミチン酸オクチルなどが好ましく挙げられるが、これらの中で、耐焼き付き性への寄与の点と入手性の観点から、ステアリン酸ブチルが最も好ましい。
本組成物においては、上述のモノエステルを1種用いてもよく、2種以上組み合わせて用いてもよい。また、圧延油組成物における該モノエステルの配合量は、組成物全量基準で0.5質量%以上、40質量%以下の範囲が好ましく、3質量%以上、30質量%以下の範囲がより好ましく、特に5質量%以上、20質量%以下の範囲が最も好ましい。該モノエステルの配合量が40質量%を超えると、ロールスリップが発生するおそれがあり、また、低温流動性が悪化するおそれもある。
摩耗防止剤としては、例えばジチオリン酸亜鉛(ZnDTP)、ジチオカルバミン酸亜鉛(ZnDTC)、硫化オキシジチオリン酸モリブデン(MoDTP)、硫化オキシジチオカルバミン酸モリブデン(MoDTC)などが挙げられる。また、その配合量は、組成物全量基準で、0.1質量%以上、5質量%以下の範囲で選定することが好ましい。
防錆剤としては、例えば、トリエタノールアミンのようなアルカノールアミン、石油スルホネート、アルキルベンゼンスルホネート、ジノニルナフタレンスルホネート、アルケニルコハク酸エステル、および多価アルコールエステル等が挙げられる。これら防錆剤の配合量は、配合効果の点から、組成物全量基準で、好ましくは0.01質量%以上、1質量%以下、より好ましくは0.05質量%以上、0.5質量%以下の範囲で選定すればよい。
消泡剤としては、例えば、シリコーン、フルオロシリコール、およびフルオロアルキルエーテル等が挙げられる。消泡剤は、消泡効果および経済性のバランスなどの点から、組成物全量基準で、0.005質量%以上、0.1質量%以下の範囲で選定することが好ましい。
〔実施例1から7まで、比較例1から5まで〕
(1)試料油の調製
表1、表2に示す配合組成を有する圧延油(試料油)を調製して、圧延機による圧延実験を行った。
(1.1)基油:40℃動粘度が7mm2/sと30mm2/sのパラフィン系鉱油2種類を用い、40℃動粘度が8mm2/sになるようにこれらの鉱油の混合比率を調整した。
(1.2)ジエステル1:式(1)のジエステルにおいて、R1、R2がともにメチル基であり、Zは、炭素数10の直鎖アルキレン基である(ドデカン二酸ジメチル)。
(1.3)ジエステル2:式(1)のジエステルにおいて、R1、R2がともにメチル基であり、Zは、炭素数12の直鎖アルキレン基である(テトラデカン二酸ジメチル)。
(1.4)ジエステル3:以下の化学式で示される脂肪族ジカルボン酸のジメチルエステル
(1.5)ジエステル4:ジイソノニルアジペート
(1.6)ジエステル5:ジイソデシルアジペート
(1.7)トリエステル:トリメリット酸とオクタノールとのトリエステル
(1.8)油性剤:ラウリルアルコール、ブチルステアレート(ステアリン酸ブチル)
(2.1)耐焼き付き性(耐ヒートスクラッチ性)の評価
表3に示す圧延条件で、圧延実験を行った。具体的には、厚さ1.5mmのSUS304(2B)材を4パスで0.67mmに圧延し,5パス目で圧下率を14.9%から徐々に上げて圧延板表面にヒートスクラッチが発生し始める圧下率を求めた。
表4に示すパススケジュールで圧延実験を行った。具体的には、3パス目の圧延後に板サンプルを5m毎に採取した。そしてサンプル板の光沢が20度グロス(ASTM D523準拠)で850を超えたときの圧延距離を求めた。この圧延距離が短いほど、ロールコーティングの生成が速いと見なせる。
なお、本実験では、実験で使用した圧延板の厚みが1mmであり、ワークロールの表面粗さRaが0.03μmである点が(2.1)の実験と異なる。
表1からわかるように、実施例1から7までの試料油は、所定のジエステルを配合してなるので、短い圧延距離で優れた光沢を発揮でき、しかも耐焼き付き性(耐ヒートスクラッチ性)にも優れる。これに対して比較例1から4までの試料油は、配合されているジエステルの構造が本発明のジエステルとは異なるため、良光沢を得るためにはかなり長い圧延距離が必要となる。また、比較例5では配合されているエステルがトリエステルであるため、同様に、良光沢を得るためにはかなり長い圧延距離が必要となる。
Claims (6)
- 基油に、下記式(1)で示されるジエステル化合物を配合してなる
ことを特徴とする金属加工用潤滑油組成物。
R1OCO-Z-COOR2 (1)
(式中、R1、R2は各々独立に炭素数1以上18以下のアルキル基であり、Zは炭素数が10以上12以下であるアルキレン基である。) - 請求項1に記載の金属加工用潤滑油組成物において、
前記式(1)におけるZが直鎖構造である
ことを特徴とする金属加工用潤滑油組成物。 - 請求項1または請求項2に記載の金属加工用潤滑油組成物において、
前記式(1)のジエステル化合物の配合量が組成物全量基準で、0.1質量%以上、30質量%以下である
ことを特徴とする金属加工用潤滑油組成物。 - 請求項1から請求項3までのいずれか1項に記載の金属加工用潤滑油組成物において、
さらに油性剤を配合してなる
ことを特徴とする金属加工用潤滑油組成物。 - 請求項1から請求項4までのいずれか1項に記載の金属加工用潤滑油組成物において、
該組成物が冷間圧延用である
ことを特徴とする金属加工用潤滑油組成物。 - 請求項5に記載の金属加工用潤滑油組成物において、
該組成物がステンレス用である
ことを特徴とする金属加工用潤滑油組成物。
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JPS63220906A (ja) * | 1987-03-09 | 1988-09-14 | Idemitsu Kosan Co Ltd | 金属箔圧延方法 |
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