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
  • C10M163/00—Lubricating compositions characterised by the additive being a mixture of a compound of unknown or incompletely defined constitution 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
  • 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
• • 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
  • C10M2207/02—Hydroxy compounds
  • C10M2207/023—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings
  • C10M2207/028—Overbased salts 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
  • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
  • C10M2207/26—Overbased carboxylic acid salts
  • C10M2207/262—Overbased carboxylic acid salts derived from hydroxy substituted aromatic acids, e.g. salicylates
• • 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
  • C10M2215/06—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to carbon atoms of six-membered aromatic rings
• • 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
  • C10M2215/28—Amides; Imides
• • 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
  • C10M2223/045—Metal containing thio derivatives
• • 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
  • C10N2030/40—Low content or no content compositions
  • C10N2030/42—Phosphor free or low phosphor content 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
  • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
  • C10N2030/40—Low content or no content compositions
  • C10N2030/43—Sulfur free or low sulfur content 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
  • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
  • C10N2030/40—Low content or no content compositions
  • C10N2030/45—Ash-less or low ash content
• • 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
  • C10N2030/50—Emission or smoke controlling properties
• • 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
  • C10N2030/74—Noack Volatility
• • 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
  • C10N2040/25—Internal-combustion engines
  • C10N2040/252—Diesel engines
• • 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
  • C10N2040/25—Internal-combustion engines
  • C10N2040/252—Diesel engines
  • C10N2040/253—Small diesel engines
• • 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
  • C10N2060/00—Chemical after-treatment of the constituents of the lubricating composition
  • C10N2060/14—Chemical after-treatment of the constituents of the lubricating composition by boron or a compound containing boron

Definitions

• the present invention relates to a lubricant composition for a diesel engine equipped with a regenerative DPF, a diesel engine system equipped with a regenerative accumulation of depositing components on a regenerative DPF in such a system.
• DPFs which are used for capturing and removing PM in exhaust gas with a filter
• a wall-flow type DPF has a structure wherein the two ends of a honeycomb monolith are alternately plugged.
• this type of a DPF has problems in that the captured PM accumulates to increase pressure loss, lower engine power, or deteriorate fuel efficiency.
• a DPF per se is replaced after a certain mileage, or detached and regenerated to remove PM by oxidization and combustion.
• continuous regenerative DPFs have been developed that are intended for mounting on vehicles and continuously regenerated while driving.
• Lubricants for diesel engines contain lubricant base oil and various additives blended therein, which include various active components, such as metals, sulfur, and phosphorus.
• various active components such as metals, sulfur, and phosphorus.
• JP-6-49476-A, JP-7-10273-A, JP-8-48989-A, JP-2000-119680-A, JP-2000 -256690-A, and JP-3-62893-A propose low-ash lubricants for diesel engines with lowered metal contents for reducing PM accumulation on a DPF.
• Low-ash lubricants for diesel engines proposed so far are effective in reducing ash settlement on a DPF.
• deposition of ash on a DPF cannot be inhibited merely by lowering the ash content.
• Such deposited ash cannot be removed easily by back flushing operation by means of air blow in the regeneration.
• the deposited ash has severe impact on the life span of a DPF, particularly of a continuous regenerative DPF.
• control of formation of the depositing ash is essential.
• details of the depositing ash formation has not been fully investigated so far, and little report has been made to date on actual evaluation and optimization of the impact of fuel and lubricant on diesel engines equipped with a regenerative DPF.
• the present inventors have made intensive researches for solving the above problems, to find out that, in a diesel engine equipped with a regenerative DPF, when diesel fuel with not more than 10 mass ppm sulfur is used as fuel, a lubricant composition containing particular components at a ratio in a particular range, is capable of remarkably inhibiting accumulation of depositing components on a DPF, and of facilitating removal of the accumulated components, to thereby complete the present invention.
• diesel fuel with more than 10 mass ppm sulfur is used, such a remarkable effect is not observed.
• a lubricant composition for a diesel engine said diesel engine being equipped with a regenerative DPF and running on diesel fuel with not more than 10 mass ppm sulfur, said lubricant composition comprising:
• additives including:
• a diesel engine system running on diesel fuel with not more than 10 mass ppm sulfur, said system comprising a regenerative DPF and the above lubricant composition for a diesel engine as an engine lubricant.
• a method for inhibiting accumulation of a depositing component on a regenerative DPF in a diesel engine system comprising running said engine system on diesel fuel with not more than 10 mass ppm sulfur, and operating said engine system using a lubricant comprising the above lubricant composition for a diesel engine.
• a method for facilitating removal of a component accumulated on a regenerative DPF in a diesel engine system comprising running said engine system on diesel fuel with not more than 10 mass ppm sulfur, and operating said engine system using a lubricant comprising the above lubricant composition for a diesel engine.
• the above lubricant composition for a diesel engine for the lubrication of a diesel engine that is equipped with a regenerative DPF and runs on diesel fuel with not more than 10 mass ppm sulfur.
• the above lubricant composition for a diesel engine for the inhibition of accumulation of a depositing component on a regenerative DPF in a diesel engine running on diesel fuel with not more than 10 mass ppm sulfur.
• the lubricant composition for a diesel engine for the facilitation of removal of a component accumulated on a regenerative DPF in a diesel engine running on diesel fuel with not more than 10 mass ppm sulfur.
• the lubricant composition for a diesel engine according to the present invention contains (A) a metal detergent, (B) an ashless dispersant, and (C) a phosphorus-based anti-wear agent, and has particular properties, the composition, when used in a diesel engine running on diesel fuel with not more than 10 mass ppm sulfur, inhibits accumulation of a component that easily deposits on the inner walls of a regenerative DPF, and facilitates removal of the component accumulated on the regenerative DPF, to thereby prolong life of the DPF.
• the lubricant composition for a diesel engine according to the present invention is particularly useful in a diesel engine system equipped with a regenerative DPF, in particular a continuous regenerative DPF, and in a method for inhibiting accumulation of a depositing component on a DPF.
• the lubricant base oil used in the lubricant composition for a diesel engine according to the present invention (sometimes referred to simply as a lubricant composition or a composition hereinbelow) is not particularly limited, and may be a mineral base oil and/or a synthesized base oil that are commonly used in lubricants.
• the mineral base oil may be, for example, a lubricant base oil prepared by atmospheric distilling crude oil, further distilling the atmospheric residue under reduced pressure, and refining the resulting lubricant fraction by at least one of solvent deasphalting, solvent extraction, hydrocracking, solvent dewaxing, and hydrorefining; or a wax-isomerized mineral oil or a lubricant base oil prepared by isomerization of GTL WAX (gas-to-liquid wax).
• GTL WAX gas-to-liquid wax
• the sulfur content of the mineral base oil is not particularly limited as long as it satisfies the conditions of the present invention, and may be, for example, usually not higher than 1 mass %, preferably not higher than 0.2 mass %, more preferably not higher than 0.1 mass %, still more preferably not higher than 0.005 mass %.
• the mineral base oil consists mainly of, or contains usually not less than 70 mass % of, preferably not less than 80 mass % of, more preferably not less than 90 mass % of, or consists solely of, a mineral base oil with not more than 0.001 mass % sulfur.
• the total aromatics of the mineral base oil is not particularly limited, and may be usually not more than 50 mass %, preferably not more than 15 mass %, more preferably not more than 10 mass %, and still more preferably not more than 8 masse, A mineral base oil with about a mass % total aromatics may also be used preferably. However, in view of the solubility of the additives or sludge, the total aromatics are usually not less than 1 mass %, preferably not less than 2 mass %, more preferably not less than 3 mass 9, most preferably not less than 5 mass %. With the total aromatics of the mineral base oil of not more than 15 mass %, a composition with superior oxidation stability may be obtained.
• the total aromatics refer to a content of an aromatic fraction as measured in accordance with ASTMD2549,
• the aromatic fraction usually includes alkylbenzene and alkylnaphthalene, as well as anthracene, phenanthrene, and alkylation products thereof; compounds obtained by condensing not less than four benzene rings; or compounds having a heteroaromatic, such as pyridines, quinolines, phenols, and naphthols.
• Examples of the synthetic base oil may include polybutene or hydrides thereof; poly- ⁇ -olefins, such as 1-octene oligomer or 1-decene oligomer, or hydrides thereof; diesters, such as ditridecyl glutarate, di-2ethylhexyl adipate diisodecyl adipate, ditridecyl adipate, or di-2-ethylhexyl sebacate, polyol esters, such as neopentyl glycol esters, trimethylolpropane caprylate, trimethylolpropane pelargonate, pentaerythritol-2-ethylhexanoate, or pentaerythritol pelargonate; aromatic synthetic oils, such as alkylnaphthalene, alkylbenzene, or aromatic esters; and mixtures of two or more of these
• the lubricant base oil used in the present invention may be the above-mentioned mineral base oil, above-mentioned synthetic base oil, or an arbitrary mixture of two or more oils selected from these.
• one or more mineral base oils, one or more synthetic base oils, or a mixed oil of one or more mineral base oils and one or more synthetic oils may be used.
• the kinematic viscosity of the lubricant base oil used in the present invention is not particularly limited, and is may preferably be not lower than 3 mm 2 /s and not higher than 20 mm 2 /s, more preferably not lower than 4 mm 2 /s and not higher than 10 mm 2 /s, still more preferably not lower than 5 mm 2 /s and not higher than 7 mm 2 /s, most preferably not lower than 6 mm 2 /s and not higher than 7 mm 2 /s at 100° C. If the kinematic viscosity is over 20 mm 2 /s, the low-temperature viscosity is deteriorated.
• kinematic viscosity is less than 3 mm 2 /s, a sufficient oil film is not formed at the lubricating site, which results in inferior lubricity and great evaporation loss of the lubricant base oil, which are not preferable.
• the evaporation loss of the lubricant base oil is preferably not more than 20 mass %, more preferably not more than 16 mass %, most preferably not more than 10 mass %, in NOACK evaporative loss. If the NOACK evaporative loss of the lubricant base oil is over 20 mass %, not only the evaporation loss of the lubricant oil is great, but also sulfur or phosphorus compounds or metals in the composition may settle on the DPF together with the lubricant base oil, which may have disadvantageous impact on formation of the depositing components As used herein, the NOACK evaporative loss is measured in accordance with CECL-40-T-87.
• the viscosity index of the lubricant base oil is not particularly limited, and may usually be not lower than 80, preferably not lower than 100, more preferably not lower than 120, most preferably not lower than 130, so as to achieve excellent viscosity property from low temperatures to high temperatures.
• a viscosity index of less than 80 adversely affects the low-temperature viscosity property, thus being not preferred,
• Component (A) of the present composition is a metal detergent.
• component (A) may include metal detergents, such as sulfonates, phenates, or salicylates of alkali metals or alkaline earth metals.
• alkali metal or alkaline earth metal sulfonate detergents and/or alkali metal or alkaline earth metal salicylate crylate detergents may preferably be used with the alkali metal or alkaline earth metal salicylate detergents being more preferred. It is particularly preferred to use an alkali metal or alkaline earth metal salicylate containing usually not less than 55 mol %, preferably not less than 60 mol % of at least one compound represented by the formula (1), and/or overbased or basic salts of such salicylate, for excellent solubility in the lubricant base oil and storage stability.
• R 1 stands for an alkyl group having 1 to 40 carbon atoms
• R 2 stands for a hydrogen atom or an alkyl group having 1 to 40 carbon atoms
• M stands for an alkali metal or alkaline earth metal, such as sodium, potassium, magnesium, barium, or calcium, with magnesium and/or calcium being preferred
• n denotes 1 or 2 depending on the valence of metal M.
• alkyl group having 1 to 40 carbon atoms may include methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl tetradecyl,pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, icosyl, henicosyl, docosyl, tricosyl, tetracosyl, pentacosyl, hexacosyl, heptacosyl, octacosyl, nonacosyl, and triacontyl groups, which may either be straight or branched.
• alkyl groups having 1 to 40 carbon atoms in particular alkyl groups having 10 to 40 carbon atoms, secondary alkyl groups having 10 to 40 carbon atoms derived from a polymer or a copolymer of ethylene, propylene, 1-butene, or the like, in particular secondary alkyl groups having 10 to 40 carbon atoms derived from an ethylene polymer are preferred, and secondary alkyl groups having 14 to 18 carbon atoms are particularly preferred.
• the alkali metal or alkaline earth metal salicylate as component (A) may preferably be an alkali metal or alkaline earth metal salicylate containing in total of not less than 55 mol %, preferably not less than 60 mol % of compound (A-1) represented by the formula (1) wherein R 1 stands for a secondary alkyl group having 10 to 19 carbon atoms, and R 2 stands for a hydrogen atom, and compound (A-2) represented by the formula (1) wherein R 1 and R 2 each stands for a secondary alkyl group having 10 to 19 carbon atoms, for its excellent solubility and storage stability.
• compound (A-1) represented by the formula (1) wherein R 1 stands for a secondary alkyl group having 10 to 19 carbon atoms, and R 2 stands for a hydrogen atom
• an alkali metal or alkaline earth metal salicylate composed mainly of, for example containing not less than 85 mol % of, preferably not less than 90 mol % of monoalkyl salicylate is particularly preferred for excellent low-temperature fluidity.
• compositional ratio of compounds (A-1) and (A-2) is usually not less than 40 mol %, preferably not less than 50 mol % of compound (A-1), and usually not more than 15 mol %, preferably not more than 10 mol % of compound (A2).
• the molar ratio of compound (A-2) to compound (A-1) ((A-2)/(A-1)) is not particularly limited, and may preferably be not higher than 0.3, more preferably not higher than 0.2 for excellent low-temperature fluidity.
• an overbased metal detergent containing an overbased or basic salt such as calcium carbonate and/or calcium borate, may preferably be used.
• the base number thereof is usually 150 to 500 mgKOH/g.
• a salicylate detergent is used, its base number is preferably 150 to 400 mgKOH/g, more preferably 150 to 200 mgKOH/g, whereas when a sulfonate or phenate detergent is used, its base number is preferably 200 to 500 mgKOH/g, more preferably 250 to 400 mgKOH/g.
• the base number refers to a base number as measured by perchloric acid method in accordance with 7. in JIS K2501 “Petroleum products and lubricants—Determination of neutralization number”.
• the content of component (A) in the present composition is not particularly limited, as long as the content of the sulfated ash, the M/P ratio, the B/M ratio, and the S/M ratio of the composition fall within the ranges defined in the present invention.
• the content of component (A) in terms of alkali metal or alkaline earth metal is usually not less than 0.01 mass % and not more than 0.5 mass %, preferably not less than 0.05 mass % and not more than 0.3 mass %, more preferably not less than 0.15 mass % and not more than 0.2 mass % of the total amount of the composition.
• Component (B) of the present composition is an ashless dispersant.
• component (B) may include a nitrogen-containing compound having in its molecule at least one straight or branched alkyl or alkenyl group having 40 to 400, preferably 60 to 350 carbon atoms, and derivatives thereof; more specifically, succinimide, benzylamine, polyamine, or the like, and derivatives thereof obtained by modification with boron, phosphorus, sulfur, organic acid, or the like. For use, any one or more of these examples may be blended.
• the alkyl or alkenyl group may either be straight or branched, and may preferably be a branched alkyl or alkenyl group derived from an oligomer of olefins, such as propylene, 1-butene, or isobutylene, or a co-oligomer of ethylene and propylene.
• a boron-containing ashless dispersant may be used, which may preferably be, for example, boron-containing poly(iso)butenyl succinimide.
• boron-containing poly(iso)butenyl succinimide There are mono-type and bis-type poly(iso)butenyl succinimides, either of which may be used, but the latter is particularly preferred.
• component (B) in the present composition is not particularly limited, and may be usually not less than 0.01 mass % and not more than 0.4 mass preferably not less than 0.02 mass % and not more than 0.2 mass %, more preferably not less than 0.02 mass % and not more than 0.15 mass % of the total amount of the composition, in terms of nitrogen.
• the content of boron derived from component (B) in the present composition is not particularly limited, as long as the B/M ratio falls within the range defined in the present invention as will be discussed later, and may be usually not less than 0.015 mass % and not more than 0.2 mass %, preferably not less than 0.018 mass % and less than 0.1 mass %, more preferably less than 0.04 mass %, particularly preferably not more than 0.03 mass %.
• the boron content is most preferably not less than 0.015 mass % and less than 0.04 mass %.
• component (B) a boron-free ashless dispersant, in particular, a boron-free succinimide ashless dispersant.
• the content thereof is not particularly limited, and preferably not less than 0.01 mass % and less than 0.08 mass %, more preferably not less than 0.02 mass % and not more than 0.07 mass % of the total amount of the composition, in terms of nitrogen.
• the mass ration of boron to nitrogen (B/N ratio) in component (B) is not particularly limited, and may be usually not lower than 0.1 and not higher than 0.5, preferably not lower than 0.14 and not higher than 0.3, more preferably not higher than 0.2.
• Component (C) of the present composition is a phosphorus-based anti-wear agent, which may be a conventional phosphorus-based anti-wear agent used in lubricants.
• component (C) may include phosphates, phosphites, thiophosphates, and thiophosphites; derivatives thereof; metal sales thereof; and amine salts thereof.
• metal mono- or dihydrocarbyl dithiophosphate and/or metal mono- or dihydrocarbyl phosphate are preferred.
• Examples of the metal in the metal salts may include zinc, molybdenum, alkali metals, and alkaline earth metals, with zinc being particularly preferred.
• the amine in the amine salts may be an amine compound having a hydrocarbon group with 1 to 30, preferably 8 to 24 carbon atoms.
• the hydrocarbon group may preferably be an alkyl or alkenyl group.
• the hydrocarbyl group may preferably has a hydrocarbon group with 1 to 30, preferably 3 to 8, more preferably 3 to 6 carbon atoms, and the hydrocarbon group may preferably be a primary or secondary alkyl group, with the latter being particularly preferred.
• zinc dialkyldithiophosphate having an alkyl group with 3 to 8 carbon atoms may preferably be used for its abilities to give a composition with particularly excellent anti-wear property, and to inhibit formation of the components depositing on a DPF. Further, zinc dialkylphosphate having an alkyl group with 3 to 8 carbon atoms may particularly preferably be used for not only its ability to inhibit formation of the components depositing on a DPF, but also for its excellently low sulfur content and long drain interval, and ability to give a low-sulfur lubricant, which results in minimized impact gas.
• the content of component (C) in the present composition is not particularly limited, and may be usually not less than 0.01 mass % and not more than 0.2 mass %, preferably not less than 0.04 mass % and not more than 0.15 mass %, more preferably not less than 0.08 mass % and not more than 0.15 mass %, particularly preferably not less than 0.1 mass % and not more than 0.15 mass % of the total amount of the composition, in terms of phosphorus.
• the lubricant composition of the present invention not only to contain the above components (A) to (C), but also to have the properties that satisfy all of the following conditions (1) to (4):
• the sulfated ash content as condition (1) may be more than 0.8 mass % and not more than 1.2 mass %, preferably not less than 0.9 mass % and not more than 1.1 mass %, more preferably not less than 1.0 mass % and not more than 1.1 mass %, depending on the desired performance of the composition or the standard for diesel engine oil.
• the M/P ration as condition (2) is 0.2 to 3, preferably not lower than 1 and not higher than 2.5, more preferably not lower than 1.2 and not higher than 2, still more preferably not lower than 1.2 and not higher than 1.6;
• the B/M ratio as condition (3) is 0.2 to 2, preferably not lower than 0.25 and not higher than 1.2, more preferably not lower than 0.3 and not higher than 0.7, still more preferably not lower than 0.3 and not higher than 0.6;
• the S/M ratio as condition (4) is 0 to 4, preferably not lower than 0.2 and not higher than 3, more preferably not lower than 1 and not higher than 2.2, still more preferably not lower than 1.5 and not higher than 2.
• the sulfated ash content as condition (1) may be 0.4 to 0.8 mass %, preferably not less than 0.45 mass % and not more than 0.6 mass %, more preferably not less than 0.5 mass % and not more than 0.55 mass %, depending on the desired performance of the composition or the standard for diesel engine oil.
• the M/P ratio as condition (2) is 0.2 to 3, preferably not lower than 0.4 and not higher than 2, more preferably not lower than 0.6 and not higher than 1.5, still more preferably not lower than 0.6 and not higher than 1;
• the B/M ratio as condition (3) is 0.2 to 2, preferably not lower than 0.5 and not higher than 2.5, more preferably not lower than 0.8 and not higher than 1.5, still more preferably not lower than 0.8 and not higher than 1.2;
• the S/M ratio as condition (4) is 0 to 4, preferably not lower than 0.5 and not higher than 3.8, more preferably not lower than 1.5 and not higher than 3.8, still more preferably not lower than 3 and not higher than 3.8.
• the sulfated ash content as condition (1) may be more than 1.2 mass % and not more than 2 mass %, preferably not less than 1.3 mass % and not more than 1.6 mass %, more preferably not less than 1.4 mass % and not more than 1.5 mass %, depending on the desired performance of the composition or the standard for diesel engine oil.
• the M/P ratio as condition (2) is 0.2 to 3, preferably not lower than 1.5 and not higher than 3, more preferably not lower than 2 and not higher than 2.6;
• the B/M ratio as condition (3) is 0.2 to 2, preferably not higher than 1, more preferably not higher than 0.5, still more preferably not higher than 0.4;
• the S/M ratio as condition (4) is 0 to 4, preferably not lower than 0.2 and not higher than 2, more preferably not lower than 0.8 and not higher than 1.5.
• the lubricant composition for a diesel engine according to the present invention inhibits formation of the depositing components to be accumulated on a regenerative DPF, in particular a continuous regenerative DPF, inhibits generation of differential pressure after regeneration, and as a result, prolongs the life of the DPF, which otherwise be terminated by clogging.
• a regenerative DPF in particular a continuous regenerative DPF
• the composition cannot fully exhibit its effect.
• the diesel fuel with not more than 10 mass ppm sulfur is not particularly limited, and may be mineral oil fuel highly refined by desulfulization, such as kerosene or diesel oil having a sulfur content of not more than 10 mass ppm; so called biodiesel fuel, such as alkyl esters of saturated or unsaturated fatty acids; or fuel substantially free of sulfur, such as dimethyl ether (DME), GTL (gas-to-liquid) kerosene or GTL diesel oil synthesized by Fischer-Tropsch reaction or the like.
• DME dimethyl ether
• GTL gas-to-liquid
• the lubricant composition for a diesel engine according for lubricants for example, suitably selected one or more of anti-oxidants, friction modifiers, anti-wear agents other than component (C), viscosity index improvers, corrosion inhibitors, rust inhibitors, demulsifiers, metal deactivators, foam inhibitors, and coloring agents
• anti-oxidants may include conventional phenol or amine anti-oxidants.
• friction modifiers may include organic molybdenum compounds, such as molybdenum dithiocarbamate or molybdenum dithiophosphate, and ashless friction modifiers, such as fatty acids, fatty acid esters, fatty acid amines, fatty acid ethers, and fatty acid amides, all having an alkyl or alkenyl group with 6 to 30 carbon atoms.
• organic molybdenum compounds such as molybdenum dithiocarbamate or molybdenum dithiophosphate
• ashless friction modifiers such as fatty acids, fatty acid esters, fatty acid amines, fatty acid ethers, and fatty acid amides, all having an alkyl or alkenyl group with 6 to 30 carbon atoms.
• anti-wear agents other than component (C) may include sulfur-containing anti-wear agents, such as sulfurized oils and fats, sulfuric esters, sulfurized olefins, polysulfides, dithiocarbamate, and zinc dithiocarbamate.
• sulfur-containing anti-wear agents such as sulfurized oils and fats, sulfuric esters, sulfurized olefins, polysulfides, dithiocarbamate, and zinc dithiocarbamate.
• viscosity index improvers may include conventional polymethacrylate, ethylene- ⁇ -olefin copolymer, styrene-diene copolymer, or poly(iso)butene viscosity index improvers, having a weight average molecular weight of 1000 to 1000000.
• corrosion inhibitors may include benzotriazole, tolyltriazole, thiadiazole, or imidazole compounds.
• rust inhibitors may include petroleum sulfonate, alkylbenzene sulfonate, dinonylnaphthalene sulfonate, alkenyl succinate, and esters of polyhydric alcohols.
• demulsifiers may include polyalkylene glycol nonionic surfactants, such as polyoxyethylene alkyl ether, polyoxyethylene alkylphenyl ether, and polyoxyethylene alkylnaphthyl ether.
• metal deactivators may include imidazoline, pyrimidine derivatives, alkylthiadiazole, mercaptobenzothiazole, benzotriazole or derivatives thereof, 1,3,4-thiadiazole polysulfide, 1,3,4-thiadiazolyl-2,5-bisdialkyl dithicarbamate, 2-(alkyldithio)benzoimidazole, and ⁇ -(o-carboxybenzylthio)propionitrile.
• foam inhibitors may include silicone, fluorosilicone, fluoroalkyl ethers.
• the contents of these optional additives in the lubricant composition of the present invention may be 0.01 to 5 mass % for each of anti-oxidants, friction modifiers, and anti-wear agents other than component (C), 0.1 to 15 mass % for viscosity index improvers, 0.005 to 5 mass % for each of corrosion inhibitors, rust inhibitors, and demulsifiers, 0.005 to 1 masse for metal deactivators, and 0,0005 to 1 mass % for foam inhibitors.
• the diesel engine system according to the present invention is equipped with a regenerative DPF, in particular not more than 10 mass ppm sulfur, and employs the lubricant composition according to the present invention as a lubricant composition for this system, so that accumulation of the depositing components on the regenerative DPF is inhibited, removal of the components accumulated on the DPF is facilitated, and life of the DPF is prolonged.
• the system structure may suitably be selected based on the conventional structures.
• the regenerative DPF may be combined with a three-way catalyst, oxidation catalyst, NOx storage reduction catalyst, or urea selective reduction catalyst.
• the method for inhibiting accumulation of depositing components on a regenerative DPF according to the present invention is for inhibiting accumulation of depositing components on a regenerative DPF, in particular a continuous regenerative DPF, in a diesel engine system running on diesel fuel with not more than 10 mass ppm sulfur, and is performed by using, as a lubricant for the diesel engine system, a lubricant containing the lubricant composition according to the present invention discussed above. With this method, the life of a DPF may be prolonged.
• Lubricants for a diesel engine having the compositions as shown in Table 1 were prepared, wherein the compositions in Example 6 and Comparative Example 4 were identical.
• a 400 cc single cylinder general purpose diesel engine was used in the test, and an externally regenerative DPF made of silicon carbide was attached to the exhaust outlet. The engine was run at 2400 rpm at 1 ⁇ 2 load for 100 hours to measure the differential pressure between the inlet and outlet of the DPF.
• each lubricant composition shown in Table 1 was placed in the oil pan, and diesel fuel with 4 mass ppm sulfur blended with 4 mass % of a lubricant composition shown in Table 1 from which “other additives” were removed, was used as fuel.
• Example 6 With the lubricant compositions of Example 6 and Comparative Example 4 having the sulfated ash content of 0.4 to 0.8 mass %, the differential pressure immediately after the regeneration was low when the diesel fuel with not more than 10 mass ppm sulfur was used in Example 6, but the differential pressure immediately after the regeneration was high when the diesel fuel with 45 mass ppm sulfur was used in Comparative Example 4, indicating high tendency of depositing component accumulation.
• Examples 1 to 5 and 7 the results were comparable to that of Example 6 wherein the sulfated ash content was reduced by half to 0.5 mass %. Further, it was implied that even at the boron content of less than 0.04 mass %, the composition could exhibit sufficient performance, and even at the total boron of 0.1 mass % as in Example 3, the effect thereof was not very different. Thus the composition may be made at a low boron content to inhibit increase of the sulfated ash caused by boron, and to obtain a cost-effective composition.
• the lubricant composition for a diesel engine according to the present invention synergistically with diesel fuel with a remarkably low sulfur content, inhibits accumulation of the depositing components on a regenerative DPF, and remarkably prolongs life of a DPF, which other wise is terminated by clogging

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