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
  • 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
  • C10M169/044—Mixtures of base-materials and additives the additives being a mixture of non-macromolecular and macromolecular compounds
• • 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
  • 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
  • C10M169/041—Mixtures of base-materials and additives the additives being macromolecular compounds 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
  • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
  • C10M2207/28—Esters
  • C10M2207/283—Esters of polyhydroxy compounds
• • 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
  • C10M2207/283—Esters of polyhydroxy compounds
  • C10M2207/2835—Esters of polyhydroxy compounds 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
  • C10M2207/28—Esters
  • C10M2207/287—Partial esters
  • C10M2207/289—Partial esters containing free hydroxy 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
  • C10M2207/28—Esters
  • C10M2207/287—Partial esters
  • C10M2207/289—Partial esters containing free hydroxy groups
  • C10M2207/2895—Partial esters containing free hydroxy groups 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
  • C10M2207/40—Fatty vegetable or animal oils
  • C10M2207/401—Fatty vegetable or animal oils 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
  • 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
  • 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
  • C10N2020/04—Molecular weight; Molecular weight distribution
• • 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
  • C10N2030/02—Pour-point; 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
  • C10N2030/08—Resistance to extreme temperature
• • 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
  • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
  • C10N2030/64—Environmental friendly compositions
• • 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
  • C10N2040/08—Hydraulic fluids, e.g. brake-fluids

Definitions

• the present invention relates to a biodegradable lubricating oil composition having flame retardancy. More particularly, the present invention relates to a biodegradable lubricating oil composition having excellent flame retardancy and high biodegradability, which oil composition is employed as a lubricating oil such as a hydraulic oil or a door closer oil.
• Patent Documents 1 to 4 propose the following hydraulic oils: a self-extinguishing hydraulic oil containing a compound produced through condensation reaction between hexachlorophosphazene, and a perfluoroalkyl alcohol or the like (Patent Document 1); a flame-retardant hydraulic oil containing a polymer compound, the compound containing, as main components, a polyol and a polyol partial ester (Patent Document 2); a flame-retardant hydraulic oil produced by incorporating a high-molecular-weight polymer and a low-molecular-weight polymer into a base oil containing a fatty acid ester or a phosphoric acid ester (Patent Document 3); and a hydraulic fluid composition containing a polyalkylene glycol base fluid, and an alkylene-vinyl ester copolymer which serves as an anti-mist additive and can be dissolved in the base fluid
• a lubricating oil such as a hydraulic oil or a door closer oil employed in a machine may be ejected through a pinhole of the machine and may accelerate the fire. Therefore, demand has arisen for a lubricating oil—such as a hydraulic oil or a door closer oil—which exhibits flame retardancy even in the case of high-pressure spraying or oil leakage. Also, demand has arisen for a lubricating oil composition having higher flame retardancy for improvement of safety, as well as higher biodegradability for reduction of environmental load.
• lubricating oils have been required to achieve improvement of safety and reduction of environmental load. Therefore, demand has arisen for a lubricating oil composition—such as a hydraulic oil or a door closer oil—which exhibits excellent flame retardancy particularly in the case of leakage of the oil composition, and which has high biodegradability and thus less affects the environment.
• a lubricating oil composition such as a hydraulic oil or a door closer oil—which exhibits excellent flame retardancy particularly in the case of leakage of the oil composition, and which has high biodegradability and thus less affects the environment.
• an object of the present invention is to provide a lubricating oil composition exhibiting more excellent flame retardancy and biodegradability.
• the present invention provides:
• a biodegradable lubricating oil composition comprising:
• A a base oil containing (a) a plant-derived oil in an amount of 60 mass % or more, and (b) a polyol ester in an amount of 40 mass % or less;
• a door closer oil comprising a biodegradable lubricating oil composition as recited in any of [1] to [4] above.
• a lubricating oil composition exhibiting more excellent flame retardancy and biodegradability.
• the biodegradable lubricating oil composition of the present invention contains (A) a base oil containing (a) a plant-derived oil in an amount of 60 mass % or more, and (b) a polyol ester in an amount of 40 mass % or less; and (B) a polymethacrylate having a mass average molecular weight of 20,000 to 300,000 in an amount of 0.1 to 5 mass %.
• the base oil (A) of the biodegradable lubricating oil composition of the present invention contains (a) a plant-derived oil in an amount of 60 mass % or more, and (b) a polyol ester in an amount of 40 mass % or less.
• the plant-derived oil (a) employed in the base oil may be, for example, rapeseed oil, sunflower oil, soybean oil, corn oil, or canola oil.
• sunflower oil or rapeseed oil is preferably employed, for improvement of, for example, the biodegradability and thermal stability of the lubricating oil composition.
• the present invention preferably employs a plant-derived oil having a high oleic acid content, for improvement of, for example, the biodegradability and thermal stability of the lubricating oil composition.
• the present invention preferably employs a plant-derived oil having an oleic acid content of 60 mass % or more, more preferably a plant-derived oil having an oleic acid content of 70 mass % or more.
• Examples of preferred plant-derived oils having a high oleic acid content include high oleic canola oil, high oleic rapeseed oil, high oleic sunflower oil, and high oleic soybean oil. High oleic rapeseed oil is particularly preferably employed.
• the amount of the aforementioned plant-derived oil contained in the base oil is 60 mass % or more, preferably 70 mass % or more for improvement of biodegradability, more preferably 75 to 99 mass % for improvement of biodegradability and thermal stability.
• the base oil (A) contains a polyol ester (b) for the purpose of improving the biodegradability and flame retardancy of the lubricating oil composition.
• a polyol ester employed.
• the polyol ester preferably contains, as a main component, a polyol partial ester produced through common esterification reaction between a single polyol and a single chain-form monocarboxylic acid or between two or more polyols and two or more chain-form monocarboxylic acids.
• the polyol partial ester is produced through esterification of at least a portion of the polyol(s).
• the percent esterification of the polyol partial ester is preferably 70 to 90%, for improvement of flame retardancy.
• percent esterification is obtained by dividing the number of esterified hydroxyl groups of a polyol ester by the number of all the hydroxyl groups, inclusive of the esterified hydroxyl groups, of the polyol ester, and is calculated by use of the following formula:
• Examples of the polyol employed for producing the polyol ester include C3 to C12 polyols having 3 to 6 hydroxyl groups. Specific examples include trivalent alcohols such as glycerin, trimethylolethane, trimethylolpropane, and trimethylolnonane; and polyhydric alcohols such as pentaerythritol, ditrimethylolpropane, dipentaerythritol, sorbitol, and mannitol. Of these, trimethylolpropane, pentaerythritol, and glycerin are preferably employed. These polyols may be employed singly or in combination of two or more species.
• chain-form monocarboxylic acid employed for producing the polyol ester examples include C6 to C22 chain-form monocarboxylic acids.
• Specific examples include straight-chain saturated fatty acids such as caproic acid, enanthic acid, caprylic acid, pelargonic acid, capric acid, undecanoic acid, lauric acid, tridecanoic acid, myristic acid, pentadecanoic acid, palmitic acid, heptadecanoic acid, stearic acid, nonadecanoic acid, arachic acid, and behenic acid; straight-chain unsaturated fatty acids such as undecenoic acid, oleic acid, elaidic acid, setoleic acid, erucic acid, and brassidic acid; and branched-chain saturated fatty acids such as isomyristic acid, isopalmitic acid, isostearic acid, 2,2-dimethylbutanoic acid, 2,2-dimethylpentanoic acid, 2,
• an intended polyol ester can be produced by appropriately regulating the respective amounts of the polyol and chain-form monocarboxylic acid employed. Preferably, light components are sufficiently removed so as not to lower the flash point of the resultant polyol ester.
• esterification reaction products may be employed as is, or the respective reaction products may be blended together so as to achieve an intended viscosity.
• the polyol ester employed in the base oil preferably has a hydroxyl value of 30 mg KOH/g or more, more preferably 35 mg KOH/g or more.
• a hydroxyl value of 30 mg KOH/g or more, more preferably 35 mg KOH/g or more.
• the polyol ester employed in the base oil preferably has a flash point of 300° C. or higher. This is because when the flash point is excessively low, ignition is likely to occur.
• the polyol ester employed in the present invention preferably has a number average molecular weight of 600 to 1,500, more preferably 600 to 1,000, much more preferably 650 to 950.
• the resultant composition may exhibit low viscosity and flash point, and may be readily burned.
• the molecular weight is excessively high, the resultant composition may exhibit very high viscosity, and power transmission performance may be lowered.
• No particular limitation is imposed on the kinematic viscosity of the polyol ester, so long as the viscosity falls within a range corresponding to the intended use of, for example, a hydraulic oil.
• the polyol ester preferably exhibits a kinematic viscosity at 40° C.
• the polyol ester whose viscosity falls within the aforementioned range is preferably a diester of trimethylolpropane wherein the fatty acid is a mixture of oleic acid and isostearic acid.
• the aforementioned polyol ester is incorporated into the base oil in an amount of 40 mass % or less on the basis of the entirety of the base oil.
• the amount of the polyol ester is preferably 30 mass % or less, more preferably 25 mass % or less, much more preferably 1 to 25 mass %, for improvement of, for example, the flame retardancy, biodegradability, and thermal stability of the lubricating oil composition.
• the polymethacrylate (B) is employed for the purpose of preventing transformation of the base oil into mist.
• the polymethacrylate encompasses a methacrylate homopolymer and a methacrylate copolymer. From this viewpoint, the mass average molecular weight of the polymethacrylate is 20,000 to 300,000, preferably 30,000 to 300,000, more preferably 35,000 to 200,000.
• the mass average molecular weight of the polymethacrylate may be determined through GPC (gel permeation chromatography) on the basis of the mass average molecular weight as reduced to polystyrene.
• the polymethacrylate is incorporated into the lubricating oil composition in an amount of 0.1 to 5 mass %.
• the amount of the polymethacrylate is smaller than this range, the effects of the present invention may be lowered, whereas when the amount of the polymethacrylate exceeds this range, the resultant composition is likely to be degraded through shearing, which is not preferred.
• the amount of the component (B) incorporated into the lubricating oil composition is preferably 0.1 to 4 mass %, more preferably 0.2 to 3.5 mass %, much more preferably 0.3 to 3.3 mass %.
• the base oil (A) employed in the biodegradable lubricating oil composition of the present invention contains the aforementioned plant-derived oil (a) and the aforementioned polyol ester (b). According to the present invention, there can be provided a lubricating oil composition exhibiting more excellent flame retardancy and biodegradability by employing the aforementioned plant-derived oil and polyol ester, and an optimal compound serving as the polymethacrylate; i.e., component (B).
• the biodegradable lubricating oil composition of the present invention preferably contains, an additional additive, at least one species selected from among an antioxidant, a dispersant, a rust-preventive agent, a metal inactivating agent, an oily agent, an extreme pressure agent, a demulsifier, a fluidity-improving agent, and an antifoaming agent, which are generally employed as lubricating oil additives.
• an additional additive at least one species selected from among an antioxidant, a dispersant, a rust-preventive agent, a metal inactivating agent, an oily agent, an extreme pressure agent, a demulsifier, a fluidity-improving agent, and an antifoaming agent, which are generally employed as lubricating oil additives.
• antioxidants such as 2,6-di-t-butyl-4-methylphenol and 4,4′-methylenebis(2,6-di-t-butyl-4-methylphenol); amine antioxidants such as N-phenyl- ⁇ -naphthylamine, N-phenyl- ⁇ -naphthylamine, phenothiazine, and monooctyldiphenylamine; sulfur-containing antioxidants such as alkyl disulfide and benzothiazole; and zinc dialkyldithiophosphate.
• phenolic antioxidants such as 2,6-di-t-butyl-4-methylphenol and 4,4′-methylenebis(2,6-di-t-butyl-4-methylphenol)
• amine antioxidants such as N-phenyl- ⁇ -naphthylamine, N-phenyl- ⁇ -naphthylamine, phenothiazine, and monooctyldiphenylamine
• the dispersant employed may be an ashless dispersant and/or a metal-containing detergent.
• the ashless dispersant include succinimides, boron-containing succinimides, benzylamines, and boron-containing benzylamines.
• the metal-containing detergents include neutral, basic, and perbasic metal sulfonates, metal phenates, metal salicylates, and metal phosphonates.
• the metal forming such a metal sulfonate, metal phenate, metal salicylate, or metal phosphonate is preferably, for example, an alkaline earth metal such as Ca or Mg.
• Examples of the rust-preventive agent include alkenylsuccinic acid, sorbitan monooleate, pentaerythritol monooleate, and amine phosphate.
• Examples of the metal inactivating agent include benzotriazole, benzothiazole, triazole, dithiocarbamate, imidazole, and derivatives thereof.
• oily agent examples include alcohols, fatty acids, and fatty acid esters.
• fatty acid esters include esters formed of a C6 to C22 aliphatic carboxylic acid and a C1 to C18 aliphatic alcohol.
• preferred alcohols include C8 to C18 monovalent aliphatic saturated and unsaturated alcohols.
• extreme pressure agent examples include zinc dialkyldithiophosphate, dialkyl polysulfide, triaryl phosphate, and trialkyl phosphate.
• demulsifier examples include polyoxyalkylene glycol, polyoxyalkylene alkyl ether, polyoxyalkylene alkylamide, and polyoxyalkylene fatty acid ester.
• Examples of the fluidity-improving agent include polyalkyl acrylate, alkyl aromatic compounds, and ethylene-vinyl acetate copolymers.
• Examples of the antifoaming agent include dimethylpolysiloxane, diethyl silicate, and ester polymers.
• the amount of such an additive incorporated into the lubricating oil composition may be determined in consideration of the intended use of the composition.
• the total amount of the additive(s) is preferably 5.0 mass % or less, more preferably 3.0 mass % or less, much more preferably 0.5 to 2.5 mass %, on the basis of the entirety of the lubricating oil composition.
• the biodegradable lubricating oil composition of the present invention contains the base oil (A) containing the plant-derived oil (a) in an amount of 60 mass % or more and the polyol ester (b) in an amount of 40 mass % or less; and the polymethacrylate (B) having a mass average molecular weight of 20,000 to 300,000 in an amount of 0.1 to 5 mass %.
• the details, amounts, etc. of the respective components have been described above.
• the “biodegradability” of the biodegradable lubricating oil composition of the present invention is evaluated through the biodegradability test of chemicals by microorganisms according to OECD Test Guideline 301C.
• the lubricating oil composition has excellent biodegradability; specifically, the composition exhibits a percent biodegradation of 60% or more, preferably 70% or more, more preferably 80% or more.
• the composition When the lubricating oil composition is subjected to the acute toxicity test for Japanese killifish according to JIS K 0102, the composition generally exhibits a 96-hour LC 50 of 100 mg/L or more; i.e., the composition less affects living organisms.
• the lubricating oil composition is a very environmentally friendly lubricating oil.
• the biodegradable lubricating oil composition of the present invention preferably exhibits a kinematic viscosity at 40° C. of 120 mm 2 /s or less, more preferably 20 to 80 mm 2 /s, from the viewpoints of pump efficiency and pipe resistance.
• the lubricating oil composition preferably exhibits a viscosity index of 130 or more, more preferably 140 or more, for prevention of an increase in viscosity at low temperature.
• the lubricating oil composition generally exhibits a pour point of ⁇ 20° C. or lower, preferably ⁇ 30° C. or lower, more preferably ⁇ 35° C. or lower, for improvement of low-temperature fluidity.
• the lubricating oil composition generally exhibits a flash point of 250° C. or higher, preferably 260° C. or higher, more preferably 300° C. or higher, for improvement of flame retardancy.
• the lubricating oil composition preferably exhibits an acid value of 0.05 to 0.5 mg KOH/g, for
• the lubricating oil composition exhibits a low pour point. Therefore, when the lubricating oil composition is employed as a hydraulic oil, a door closer oil, or a sliding surface oil, the machine employed exhibits favorable startability at low temperature. Since the lubricating oil composition exhibits a high flash point, it exhibits high flame retardancy.
• the lubricating oil composition which exhibits VG32 or more, is classified as a flammable liquid according to the Japanese Fire Services Act, and exhibits excellent safety.
• the biodegradable lubricating oil composition of the present invention exhibits excellent biodegradability, less affects living organisms, and exhibits excellent flame retardancy.
• the lubricating oil composition is suitable for use as, for example, a hydraulic oil employed as a power transmission fluid in a hydraulic system of, for example, a hydraulic machine or apparatus for power transmission, power control, power buffering, etc.; a door closer oil employed for a door closer; i.e., a device which is mounted on a door (hinged door) and automatically closes the opened door; or a sliding surface oil which is applied to various sliding surfaces for imparting lubricity thereto.
• a base oil was prepared by mixing a plant-derived oil and a polyol ester in proportions as shown in Table 1. Thereafter, as shown in Table 1, a polymethacrylate and additional additives were added to the base oil, to thereby produce a lubricating oil composition.
• the thus-produced lubricating oil composition was evaluated in terms of general properties, lubricity, combustibility, and biodegradability as described below. The results are shown in Table 1. Next will be described details of the employed plant-derived oil, polyol esters, and polymethacrylates.
• High oleic rapeseed oil amount of oleic acid: 73 mass %, amount of a fatty acid having 16 or less carbon atoms: 4 mass %, amount of a C18 fatty acid (exclusive of oleic acid): 22 mass %
• Acid value was determined through the potential difference method according to the “lubricating oil neutralization test method” specified by JIS K 2501.
• Hydroxyl value was determined through the pyridine-acetyl chloride method according to JIS K 0070.
• Flash point was determined by means of a Cleveland open cup (COC) tester according to JIS K 2274.
• the corrosiveness of a sample was evaluated through the test tube method according to JIS K 2513 “Petroleum Products—Corrosiveness to Copper—Copper Strip Test.” The test was carried out at 100° C. for three hours. The sample copper strip was observed for tarnish with reference to “Copper Strip Corrosion Standards,” and a classification number from 1a to 4c was assigned to indicate the degree of corrosiveness. A smaller number represents lower corrosiveness, and corrosiveness increases in alphabetical order.
• test was carried out according to JIS K 2510. Specifically, a sample was mixed with water at 60° C., and a test piece of steel round rod was immersed in the mixture for 24 hours. Thereafter, the test piece was observed for determining the presence or absence of rust on the test piece.
• Load wear index was determined from last non-seizure load (LNL) and weld load (WL). The greater the LWI, the better the load bearing.
• test conditions are as follows: spraying pressure: 70 kg/cm 2 G (nitrogen pressurization), sample oil temperature: 60° C., nozzle: Monarch 60° PL 2.25 (hollow cone type), distance between nozzle and burner: 10 cm, preliminary combustion time: 10 seconds, autoclave capacity: 1 L.
• Percent biodegradation is determined according to the modified MITI test method “OECD 301C.” According to the Eco-mark certification revised in July, 1998, percent biodegradation is required to be 60% or more.
• test is carried out according to JIS K 0102.
• Japanese killifish is employed as a test fish, and 96-hour LC 50 is determined.
• 96-hour LC 50 is required to be 100 mg/L or more.
• the biodegradable lubricating oil composition of the present invention exhibits excellent flame retardancy and biodegradability. Therefore, the lubricating oil composition is suitable for use as, for example, a hydraulic oil employed as a power transmission fluid in a hydraulic system of, for example, a hydraulic machine or apparatus for power transmission, power control, power buffering, etc.; or a door closer oil employed for a door closer.

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• 2010
  • 2010-03-31 JP JP2010084472A patent/JP5764298B2/ja active Active
• 2011
  • 2011-03-29 WO PCT/JP2011/057904 patent/WO2011125679A1/ja active Application Filing
  • 2011-03-29 EP EP11765579.5A patent/EP2554646B1/en active Active
  • 2011-03-29 CN CN2011800145217A patent/CN102812114A/zh active Pending
  • 2011-03-29 US US13/637,659 patent/US20130017984A1/en not_active Abandoned
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