WO2019012450A1 - LUBRICATING OIL COMPOSITIONS AND METHOD FOR PREVENTING OR REDUCING LOW SPEED PRE-LIGHTING IN DIRECT INJECTION SPARK IGNITION ENGINES - Google Patents

LUBRICATING OIL COMPOSITIONS AND METHOD FOR PREVENTING OR REDUCING LOW SPEED PRE-LIGHTING IN DIRECT INJECTION SPARK IGNITION ENGINES Download PDF

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Publication number
WO2019012450A1
WO2019012450A1 PCT/IB2018/055118 IB2018055118W WO2019012450A1 WO 2019012450 A1 WO2019012450 A1 WO 2019012450A1 IB 2018055118 W IB2018055118 W IB 2018055118W WO 2019012450 A1 WO2019012450 A1 WO 2019012450A1
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WIPO (PCT)
Prior art keywords
zinc
compound
oil composition
lubricating oil
sulfur
Prior art date
Application number
PCT/IB2018/055118
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English (en)
French (fr)
Inventor
Ian G. ELLIOTT
Christophe P. Le Deore
Richard E. Cherpeck
Amir Gamal MARIA
Theresa Liang GUNAWAN
Original Assignee
Chevron Oronite Company Llc
Chevron Oronite Sas
Chevron Usa Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chevron Oronite Company Llc, Chevron Oronite Sas, Chevron Usa Inc. filed Critical Chevron Oronite Company Llc
Priority to CA3069627A priority Critical patent/CA3069627A1/en
Priority to CN201880055665.9A priority patent/CN111032836A/zh
Priority to EP18752276.8A priority patent/EP3652282A1/en
Priority to SG11202000337PA priority patent/SG11202000337PA/en
Priority to JP2020501227A priority patent/JP7221271B2/ja
Publication of WO2019012450A1 publication Critical patent/WO2019012450A1/en

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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
    • C10M159/00—Lubricating compositions characterised by the additive being of unknown or incompletely defined constitution
    • C10M159/12—Reaction products
    • C10M159/20—Reaction mixtures having an excess of neutralising base, e.g. so-called overbasic or highly basic products
    • 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
    • C10M125/00—Lubricating compositions characterised by the additive being an inorganic material
    • C10M125/04—Metals; Alloys
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    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M125/00—Lubricating compositions characterised by the additive being an inorganic material
    • C10M125/10—Metal oxides, hydroxides, carbonates or bicarbonates
    • 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
    • C10M129/26—Carboxylic acids; Salts thereof
    • C10M129/28—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M129/38—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having 8 or more carbon atoms
    • C10M129/40—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having 8 or more carbon atoms monocarboxylic
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    • C10M135/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing sulfur, selenium or tellurium
    • C10M135/12—Thio-acids; Thiocyanates; Derivatives thereof
    • C10M135/14—Thio-acids; Thiocyanates; Derivatives thereof having a carbon-to-sulfur double bond
    • C10M135/18—Thio-acids; Thiocyanates; Derivatives thereof having a carbon-to-sulfur double bond thiocarbamic type, e.g. containing the groups
    • C—CHEMISTRY; METALLURGY
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    • C10M159/12—Reaction products
    • C10M159/18—Complexes with metals
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    • C10M2201/04—Elements
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    • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
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    • C10M2205/028—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms
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    • C10M2219/044—Sulfonic acids, Derivatives thereof, e.g. neutral salts
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    • C10M2219/046—Overbasedsulfonic acid salts
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    • C10M2219/06—Thio-acids; Thiocyanates; Derivatives thereof
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    • C10N2040/25—Internal-combustion engines
    • C10N2040/255—Gasoline engines

Definitions

  • This disclosure relates to a lubricant composition for a direct injected, boosted, spark ignited internal combustion engine that contains at least one non-sulfur-phosphorus containing zinc compound.
  • This disclosure also relates to a method for preventing or reducing low speed pre- ignition in an engine lubricated with a formulated oil.
  • the formulated oil has a composition comprising at least one oil soluble or oil dispersible non-sulfur-phosphorus zinc compound.
  • LSPI low speed pre-ignition
  • the present disclosure provides a method for preventing or reducing low speed pre-ignition in a direct injected, boosted, spark ignited internal combustion engine, said method comprising the step of lubricating the crankcase of the engine with a lubricating oil composition comprising from about 200 to about 3000 ppm of zinc metal from at least one non-sulfur- phosphorus containing zinc compound, based on the total weight of the lubricating oil.
  • the non-sulfur-phosphorus containing zinc compound is a zinc alkoxide or thiolate compound, zinc aryloxide or arylthiolate compound, colloidal dispersion of zinc oxide, stable colloidal zinc suspension, zinc amido compound, zinc acetylacetonate compound, zinc carboxylate, zinc alkylhydroxybenzoate, zinc arylsulfonate, zinc sulfurized phenate, zinc dithiocarbamato complex, zinc salen complex, bimetallic zinc complex, zinc phosphate ester, zinc phospinate, zinc phosphinite complex, zinc pyridyl complex, zinc polypyridyl complex, zinc quinolinolato complex, zinc succinimide.
  • the present disclosure provides a lubricating engine oil composition for a direct injected, boosted, spark ignited internal combustion engine comprising from about 200 to about 3000 ppm of zinc metal from at least one non-sulfur-phosphorus containing zinc compound, based on the total weight of the lubricating oil.
  • boosting refers to running an engine at higher intake pressures than in naturally aspirated engines.
  • a boosted condition can be reached by use of a turbocharger (driven by exhaust) or a supercharger (driven by the engine).
  • Boosting refers to running an engine at higher intake pressures than in naturally aspirated engines.
  • a boosted condition can be reached by use of a turbocharger (driven by exhaust) or a supercharger (driven by the engine).
  • Using smaller engines that provide higher power densities has allowed engine manufacturers to provide excellent performance while reducing frictional and pumping losses. This is accomplished by increasing boost pressures with the use of turbochargers or mechanical superchargers, and by down-speeding the engine by using higher transmission gear ratios allowed by higher torque generation at lower engine speeds.
  • oil soluble or dispersible is used.
  • oil soluble or dispersible is meant that an amount needed to provide the desired level of activity or performance can be incorporated by being dissolved, dispersed or suspended in an oil of lubricating viscosity. Usually, this means that at least about 0.001% by weight of the material can be incorporated in a lubricating oil composition.
  • sulfated ash refers to the non-combustible residue resulting from detergents and metallic additives in lubricating oil. Sulfated ash may be determined using ASTM Test D874.
  • Total Base Number refers to the amount of base equivalent to milligrams of KOH in one gram of sample. Thus, higher TBN numbers reflect more alkaline products, and therefore a greater alkalinity. TBN was determined using ASTM D 2896 test. Unless otherwise specified, all percentages are in weight percent.
  • the level of sulfur in the lubricating oil compositions of the present invention is less than or equal to about 0.7 wt. %, based on the total weight of the lubricating oil composition, e.g., a level of sulfur of about 0.01 wt. % to about 0.70 wt. %, 0.01 to 0.6 wt.%, 0.01 to 0.5 wt.%, 0.01 to 0.4 wt.%, 0.01 to 0.3 wt.%, 0.01 to 0.2 wt.%, 0.01 wt. % to 0.10 wt. %. In one embodiment, the level of sulfur in the lubricating oil compositions of the present invention is less than or equal to about 0.60 wt.
  • % less than or equal to about 0.50 wt. %, less than or equal to about 0.40 wt. %, less than or equal to about 0.30 wt. %, less than or equal to about 0.20 wt. %, less than or equal to about 0.10 wt. % based on the total weight of the lubricating oil composition.
  • the levels of phosphorus in the lubricating oil compositions of the present invention is less than or equal to about 0.12 wt. %, based on the total weight of the lubricating oil composition, e.g., a level of phosphorus of about 0.01 wt. % to about 0.12 wt. %. In one embodiment, the levels of phosphorus in the lubricating oil compositions of the present invention is less than or equal to about 0.11 wt. %, based on the total weight of the lubricating oil composition, e.g., a level of phosphorus of about 0.01 wt. % to about 0.11 wt. %.
  • the levels of phosphorus in the lubricating oil compositions of the present invention is less than or equal to about 0.10 wt. %, based on the total weight of the lubricating oil composition, e.g., a level of phosphorus of about 0.01 wt. % to about 0.10 wt. %. In one embodiment, the levels of phosphorus in the lubricating oil compositions of the present invention is less than or equal to about 0.09 wt. %, based on the total weight of the lubricating oil composition, e.g., a level of phosphorus of about 0.01 wt. % to about 0.09 wt. %.
  • the levels of phosphorus in the lubricating oil compositions of the present invention is less than or equal to about 0.08 wt. %, based on the total weight of the lubricating oil composition, e.g., a level of phosphorus of about 0.01 wt. % to about 0.08 wt. %. In one embodiment, the levels of phosphorus in the lubricating oil compositions of the present invention is less than or equal to about 0.07 wt. %, based on the total weight of the lubricating oil composition, e.g., a level of phosphorus of about 0.01 wt. % to about 0.07 wt. %.
  • the levels of phosphorus in the lubricating oil compositions of the present invention is less than or equal to about 0.05 wt. %, based on the total weight of the lubricating oil composition, e.g., a level of phosphorus of about 0.01 wt. % to about 0.05 wt. %.
  • the level of sulfated ash produced by the lubricating oil compositions of the present invention is less than or equal to about 1.60 wt. % as determined by ASTM D 874, e.g., a level of sulfated ash of from about 0.10 to about 1.60 wt. % as determined by ASTM D 874.
  • the level of sulfated ash produced by the lubricating oil compositions of the present invention is less than or equal to about 1.00 wt. % as determined by ASTM D 874, e.g., a level of sulfated ash of from about 0.10 to about 1.00 wt. % as determined by ASTM D 874. In one embodiment, the level of sulfated ash produced by the lubricating oil compositions of the present invention is less than or equal to about 0.80 wt. % as determined by ASTM D 874, e.g., a level of sulfated ash of from about 0.10 to about 0.80 wt. % as determined by ASTM D 874.
  • the level of sulfated ash produced by the lubricating oil compositions of the present invention is less than or equal to about 0.60 wt. % as determined by ASTM D 874, e.g., a level of sulfated ash of from about 0.10 to about 0.60 wt. % as determined by ASTM D 874.
  • the present lubricating oil composition may have a total base number (TBN) of 4 to 15 mg KOH/g (e.g., 5 to 12 mg KOH/g, 6 to 12 mg KOH/g, or 8 to 12 mg KOH/g).
  • TBN total base number
  • Low Speed Pre-Ignition is most likely to occur in direct-injected, boosted (turbocharged or supercharged), spark-ignited (gasoline) internal combustion engines that, in operation, generate a break mean effective pressure level of greater than about 15 bar (peak torque), such as at least about 18 bar, particularly at least about 20 bar at engine speeds of from about 1500 to about 2500 rotations per minute (rpm), such as at engine speeds of from about 1500 to about 2000 rpm.
  • peak torque peak torque
  • rpm rotations per minute
  • break mean effective pressure BMEP
  • the word "brake” denotes the actual torque/power available at the engine flywheel, as measured on a dynamometer.
  • BMEP is a measure of the useful power output of the engine.
  • the engine is operated at speeds between 500 rpm and 3000 rpm, or 800 rpm to 2800 rpm, or even 1000 rpm to 2600 rpm. Additionally, the engine may be operated with a break mean effective pressure of 10 bars to 30 bars, or 12 bars to 24 bars.
  • the method of the invention is such that there are less than 15 LSPI events per 100,000 combustion events or less than 10 LSPI events per 100,000 combustion events. In one embodiment, there may be less than 5 LSPI events per 100,000 combustion events, less than 4 LSPI events per 100,000 combustion events, less than 3 LSPI events per 100,000 combustion events, less than 2 LSPI events per 100,000 combustion events, less than 1 LSPI event per 100,000 combustion events,or there may be 0 LSPI events per 100,000 combustion events.
  • the present disclosure provides a method for preventing or reducing low speed pre-ignition in a direct injected, boosted, spark ignited internal combustion engine, said method comprising the step of lubricating the crankcase of the engine with a lubricating oil composition comprising at least one non-sulfur-phosphorus containing zinc compound.
  • the amount of zinc metal from the at least one non-sulfur-phosphorus containing zinc compound is from about 200 to about 3000 ppm, or from about 250 to about 3000 ppm, from about 300 to about 3000 ppm, from about 350 to about 3000 ppm, from about 400 ppm to about 3000 ppm, from about 500 to about 3000 ppm, from about 600 to about 3000 ppm, from about 700 to about 3000 ppm, from about 900 to about 3000, from about 950 to about 3000 ppm, from about 1000 to 3000 ppm, from about 1050 to about 3000 ppm, from about 1100 to about 3000 ppm, from about 1200 to about 3000 ppm, from about 1300 to about 3000 ppm, from about 1400 to about 3000 ppm, or from about 1400 to 3000 ppm.
  • the total amount of zinc in the formulation including the metal from the at least one non-sulfur-phosphorus containing zinc compound is from about 700 to about 4000 ppm, or from about 800 to about 4000 ppm, from about 900 to about 4000, from about 950 to about 4000 ppm, from about 1000 to 4000 ppm, from about 1050 to about 4000 ppm, from about 1100 to about 4000 ppm, from about 1200 to about 4000 ppm, from about 1300 to about 4000 ppm, from about 1400 to about 4000 ppm, or from about 1400 to 4000 ppm.
  • the method of the invention provides a reduction in the number of LSPI events of at least 10 percent, or at least 20 percent, or at least 30 percent, or at least 50 percent, or at least 60 percent, or at least 70 percent, or at least 80 percent, or at least 90 percent, or at least 95 percent, compared to an oil that does not contain the at least one non-sulfur-phosphorus containing zinc compound.
  • the present disclosure provides a method for reducing the severity of low speed pre-ignition events in a direct injected, boosted, spark ignited internal combustion engine, said method comprising the step of lubricating the crankcase of the engine with a lubricating oil composition comprising at least one least one non-sulfur-phosphorus containing zinc compound.
  • LSPI events are determined by monitoring peak cylinder pressure (PP) and mass fraction burn (MFB) of the fuel charge in the cylinder. When either or both criteria are met, it can be said that an LSPI event has occurred.
  • the threshold for peak cylinder pressure varies by test, but is typically 4-5 standard deviations above the average cylinder pressure.
  • the MFB threshold is typically 4-5 standard deviations earlier than the average MFB (represented in crank angle degrees).
  • LSPI events can be reported as average events per test, events per 100,000 combustion cycles, events per cycle, and/or combustion cycles per event.
  • the number of LSPI events where both MFB02 and Peak Pressure (PP) Requirements that were greater than 90 bar of pressure is less than 5 events, less than 4 events, less than 3 events, less than 2 events, or less than 1 event.
  • the number of LSPI events that were greater than 90 bar was zero events, or in other words completely suppressed LSPI events greater than 90 bar.
  • the number of LSPI events where both MFB02 and Peak Pressure (PP) Requirements that were greater than 100 bar of pressure is less than 5 events, less than 4 events, less than 3 events, less than 2 events, or less than 1 event. In one embodiment, the number of LSPI events that were greater than 100 bar was zero events, or in other words completely suppressed LSPI events greater than 100 bar. In one embodiment, the number of LSPI events where both MFB02 and Peak Pressure (PP) Requirements that were greater than 110 bar of pressure is less than 5 events, less than 4 events, less than 3 events, less than 2 events, or less than 1 event.
  • the number of LSPI events that were greater than 110 bar was zero events, or in other words completely suppressed LSPI events greater than 110 bar.
  • the number of LSPI events where both MFB02 and Peak Pressure (PP) Requirements that were greater than 120 bar of pressure is less than 5 events, less than 4 events, less than 3 events, less than 2 events, or less than 1 event.
  • the number of LSPI events that were greater than 120 bar was zero events, or in other words completely suppressed very severe LSPI events (i.e., events greater than 120 bar).
  • the disclosure further provides the method described herein in which the engine is fueled with a liquid hydrocarbon fuel, a liquid nonhydrocarbon fuel, or mixtures thereof.
  • the disclosure further provides the method described herein in which the engine is fueled by natural gas, liquefied petroleum gas (LPG), compressed natural gas (CNG), or mixtures thereof.
  • Lubricating oil compositions suitable for use as passenger car motor oils conventionally comprise a major amount of oil of lubricating viscosity and minor amounts of performance enhancing additives, including ash-containing compounds.
  • zinc is introduced into the lubricating oil compositions used in the practice of the present disclosure by one or more non-sulfur-phosphorus containing zinc compound.
  • the oil of lubricating viscosity for use in the lubricating oil compositions of this disclosure is typically present in a major amount, e.g., an amount of greater than 50 wt. %, preferably greater than about 70 wt. %, more preferably from about 80 to about 99.5 wt. % and most preferably from about 85 to about 98 wt. %, based on the total weight of the composition.
  • base oil as used herein shall be understood to mean a base stock or blend of base stocks which is a lubricant component that is produced by a single manufacturer to the same specifications (independent of feed source or manufacturer's location); that meets the same manufacturer's specification; and that is identified by a unique formula, product identification number, or both.
  • the base oil for use herein can be any presently known or later-discovered oil of lubricating viscosity used in formulating lubricating oil compositions for any and all such applications, e.g., engine oils, marine cylinder oils, functional fluids such as hydraulic oils, gear oils, transmission fluids, etc.
  • the base oils for use herein can optionally contain viscosity index improvers, e.g., polymeric alkylmethacrylates; olefinic copolymers, e.g., an ethylene-propylene copolymer or a styrene- diene copolymer; and the like and mixtures thereof.
  • viscosity index improvers e.g., polymeric alkylmethacrylates
  • olefinic copolymers e.g., an ethylene-propylene copolymer or a styrene- diene copolymer; and the like and mixtures thereof.
  • the viscosity of the base oil is dependent upon the application. Accordingly, the viscosity of a base oil for use herein will ordinarily range from about 2 to about 2000 centistokes (cSt) at 100° Centigrade (C). Generally, individually the base oils used as engine oils will have a kinematic viscosity range at 100° C.
  • a lubricating oil composition having an SAE Viscosity Grade of 0W, 0W-8, OW-12, OW-16, 0W- 20, OW-26, 0W-30, OW-40, 0W-50, OW-60, 5W, 5W-20, 5W-30, 5W-40, 5W-50, 5W-60, 10W, 10W-20, 10W-30, 1 OW-40, 10W-50, 15W, 15W-20, 15W-30, 15W-40, 30, 40 and the like.
  • Group I base oils generally refer to a petroleum derived lubricating base oil having a saturates content of less than 90 wt. % (as determined by ASTM D 2007) and/or a total sulfur content of greater than 300 ppm (as determined by ASTM D 2622, ASTM D 4294, ASTM D 4297 or ASTM D 3120) and has a viscosity index (VI) of greater than or equal to 80 and less than 120 (as determined by ASTM D 2270).
  • Group II base oils generally refer to a petroleum derived lubricating base oil having a total sulfur content equal to or less than 300 parts per million (ppm) (as determined by ASTM D 2622, ASTM D 4294, ASTM D 4927 or ASTM D 3120), a saturates content equal to or greater than 90 weight percent (as determined by ASTM D 2007), and a viscosity index (VI) of between 80 and 120 (as determined by ASTM D 2270).
  • ppm parts per million
  • Group III base oils generally refer to a petroleum derived lubricating base oil having less than 300 ppm sulfur, a saturates content greater than 90 weight percent, and a VI of 120 or greater.
  • Group IV base oils are polyalphaolefins (PAOs).
  • Group V base oils include all other base oils not included in Group I, II, III, or IV.
  • the lubricating oil composition can contain minor amounts of other base oil components.
  • the lubricating oil composition can contain a minor amount of a base oil derived from natural lubricating oils, synthetic lubricating oils or mixtures thereof.
  • Suitable base oil includes base stocks obtained by isomerization of synthetic wax and slack wax, as well as hydrocracked base stocks produced by hydrocracking (rather than solvent extracting) the aromatic and polar components of the crude.
  • Suitable natural oils include mineral lubricating oils such as, for example, liquid petroleum oils, solvent-treated or acid-treated mineral lubricating oils of the paraffinic, naphthenic or mixed paraffinic-naphthenic types, oils derived from coal or shale, animal oils, vegetable oils (e.g., rapeseed oils, castor oils and lard oil), and the like.
  • mineral lubricating oils such as, for example, liquid petroleum oils, solvent-treated or acid-treated mineral lubricating oils of the paraffinic, naphthenic or mixed paraffinic-naphthenic types, oils derived from coal or shale, animal oils, vegetable oils (e.g., rapeseed oils, castor oils and lard oil), and the like.
  • Suitable synthetic lubricating oils include, but are not limited to, hydrocarbon oils and halo- substituted hydrocarbon oils such as polymerized and interpolymerized olefins, e.g., polybutylenes, polypropylenes, propylene-isobutylene copolymers, chlorinated polybutylenes, poly(l-hexenes), poly(l-octenes), poly(l-decenes), and the like and mixtures thereof; alkylbenzenes such as dodecylbenzenes, tetradecylbenzenes, dinonylbenzenes, di(2- ethylhexyl)-benzenes, and the like; polyphenyls such as biphenyls, terphenyls, alkylated polyphenyls, and the like; alkylated diphenyl ethers and alkylated diphenyl sulfides and the derivative, analogs and homologs
  • Other synthetic lubricating oils include, but are not limited to, oils made by polymerizing olefins of less than 5 carbon atoms such as ethylene, propylene, butylenes, isobutene, pentene, and mixtures thereof. Methods of preparing such polymer oils are well known to those skilled in the art.
  • Additional synthetic hydrocarbon oils include liquid polymers of alpha olefins having the proper viscosity.
  • Especially useful synthetic hydrocarbon oils are the hydrogenated liquid oligomers of CG to C12 alpha olefins such as, for example, 1-decene trimer.
  • Another class of synthetic lubricating oils include, but are not limited to, alkylene oxide polymers, i.e., homopolymers, interpolymers, and derivatives thereof where the terminal hydroxyl groups have been modified by, for example, esterification or etherification.
  • oils are exemplified by the oils prepared through polymerization of ethylene oxide or propylene oxide, the alkyl and phenyl ethers of these polyoxyalkylene polymers (e.g., methyl poly propylene glycol ether having an average molecular weight of 1,000, diphenyl ether of polyethylene glycol having a molecular weight of 500-1000, diethyl ether of polypropylene glycol having a molecular weight of 1,000-1,500, etc.) or mono- and polycarboxylic esters thereof such as, for example, the acetic esters, mixed C3-C8 fatty acid esters, or the C13 oxo acid diester of tetraethylene glycol.
  • the alkyl and phenyl ethers of these polyoxyalkylene polymers e.g., methyl poly propylene glycol ether having an average molecular weight of 1,000, diphenyl ether of polyethylene glycol having a molecular weight of 500-1000, die
  • Yet another class of synthetic lubricating oils include, but are not limited to, the esters of dicarboxylic acids e.g., phthalic acid, succinic acid, alkyl succinic acids, alkenyl succinic acids, maleic acid, azelaic acid, suberic acid, sebacic acid, fumaric acid, adipic acid, linoleic acid dimer, malonic acids, alkyl malonic acids, alkenyl malonic acids, etc., with a variety of alcohols, e.g., butyl alcohol, hexyl alcohol, dodecyl alcohol, 2-ethylhexyl alcohol, ethylene glycol, diethylene glycol monoether, propylene glycol, etc.
  • dicarboxylic acids e.g., phthalic acid, succinic acid, alkyl succinic acids, alkenyl succinic acids, maleic acid, azelaic acid, suberic acid, sebacic acid, fumaric
  • esters include dibutyl adipate, di(2-ethylhexyl)sebacate, di-n-hexyl fumarate, dioctyl sebacate, diisooctyl azelate, diisodecyl azelate, dioctyl phthalate, didecyl phthalate, dieicosyl sebacate, the 2-ethylhexyl diester of linoleic acid dimer, the complex ester formed by reacting one mole of sebacic acid with two moles of tetraethylene glycol and two moles of 2-ethylhexanoic acid and the like.
  • Esters useful as synthetic oils also include, but are not limited to, those made from carboxylic acids having from about 5 to about 12 carbon atoms with alcohols, e.g., methanol, ethanol, etc., polyols and polyol ethers such as neopentyl glycol, trimethylol propane, pentaerythritol, dipentaerythritol, tripentaerythritol, and the like.
  • Silicon-based oils such as, for example, polyalkyl-, polyaryl-, polyalkoxy- or polyaryloxy- siloxane oils and silicate oils, comprise another useful class of synthetic lubricating oils. Specific examples of these include, but are not limited to, tetraethyl silicate, tetra-isopropyl silicate, tetra-(2-ethylhexyl) silicate, tetra-(4-methyl-hexyl)silicate, tetra-(p-tert- butylphenyl) silicate, hexyl-(4-methyl-2-pentoxy)disiloxane, poly(methyl)siloxanes, poly(methylphenyl)siloxanes, and the like.
  • Still yet other useful synthetic lubricating oils include, but are not limited to, liquid esters of phosphorous containing acids, e.g., tricresyl phosphate, trioctyl phosphate, diethyl ester of decane phosphionic acid, etc., polymeric tetrahydrofurans and the like.
  • the lubricating oil may be derived from unrefined, refined and rerefined oils, either natural, synthetic or mixtures of two or more of any of these of the type disclosed hereinabove.
  • Unrefined oils are those obtained directly from a natural or synthetic source (e.g., coal, shale, or tar sands bitumen) without further purification or treatment.
  • Examples of unrefined oils include, but are not limited to, a shale oil obtained directly from retorting operations, a petroleum oil obtained directly from distillation or an ester oil obtained directly from an esterification process, each of which is then used without further treatment.
  • Refined oils are similar to the unrefined oils except they have been further treated in one or more purification steps to improve one or more properties.
  • These purification techniques are known to those of skill in the art and include, for example, solvent extractions, secondary distillation, acid or base extraction, filtration, percolation, hydrotreating, dewaxing, etc.
  • Rerefined oils are obtained by treating used oils in processes similar to those used to obtain refined oils.
  • Such rerefined oils are also known as reclaimed or reprocessed oils and often are additionally processed by techniques directed to removal of spent additives and oil breakdown products.
  • Lubricating oil base stocks derived from the hydroisomerization of wax may also be used, either alone or in combination with the aforesaid natural and/or synthetic base stocks.
  • Such wax isomerate oil is produced by the hydroisomerization of natural or synthetic waxes or mixtures thereof over a hydroisomerization catalyst.
  • Natural waxes are typically the slack waxes recovered by the solvent dewaxing of mineral oils; synthetic waxes are typically the wax produced by the Fischer-Tropsch process.
  • Other useful fluids of lubricating viscosity include non-conventional or unconventional base stocks that have been processed, preferably catalytically, or synthesized to provide high performance lubrication characteristics.
  • the lubrication oil compositions herein can contain one or more non-sulfur phosphorus containing zinc compounds.
  • Non-sulfur phosphorus containing zinc compounds is taken to mean that the zinc additive does not contain both phosphorus and sulfur in the bonding ligands, but may separately contain phosphorus or sulfur or neither of those atoms.
  • suitable additives have been described in Stahl, L; et al, "Zinc Organometallics" in Comprehensive Organometallic Chemistry III; 1st Edition; Mingos, D. M. P.; Crabtree, R. H.; Meyer, K.; Eds.; Elsevier: Oxford, 2007, pp 311-412, and is incorporated herein by reference.
  • the zinc complexes described in this disclosure are typically prepared by reacting a di- or tetravalent zinc reactant with a suitable ligand using methods apparent to a practitioner of ordinary skill in the art.
  • the zinc complexes described are represented by their most simple molecular formulas, but it is understood in the art that aggregate, multinuclear, and cluster complexes may also exist in chemical equilibrium with the simplified molecular formula.
  • the zinc complexes are generally accepted as meaning the product between a zinc reactant and a suitable ligand or ligands.
  • zinc reactants include, but are not limited to zinc oxide, zinc sulfide, zinc sulfate, zinc chloride, zinc chloride tetrahydrofuran complex, dichloro(N,N,N',N'-tetramethylehtylenediamine) zinc, zinc bromide, zinc iodide, zinc fluoride, zinc methoxide, zinc phosphate, zinc stearate, zinc acetylacetonate, zinc acetate, zinc carbonate hydroxide, zinc naphthenate, or similar zinc compounds.
  • Some zinc reagents may exist as a hydrated species. Any one of these zinc compounds described above can be used as the zinc compound of the present disclosure.
  • Preferred zinc compounds are zinc oxide or zinc chloride.
  • the zinc reactants can also be the zinc compound of the present disclosure as long as they do not contain both sulfur and phosphorus.
  • the zinc complexes described herein are oil-soluble or oil dispersible.
  • the zinc compound can be a zinc alkoxide or thiolate compound.
  • the zinc alkoxides or thiolates can be of the form Zn(YRA)»LY where Y is an oxygen or sulfur atom, RA is a linear, cyclic, or branched, saturated or unsaturated, aliphatic hydrocarbon moiety having from 1 to about 20 carbon atoms, n is an integer from 0 to 2, L is a ligand that saturates the coordination sphere of zinc, and x is an integer from 0 to 4.
  • the ligand, L is selected from the group consisting of water, hydroxide, phosphine, phosphite, ammonia, amino, amido, alkylthiolate, halide, and combinations thereof so long as the zinc species does not contain both sulfur and phosphorus groups.
  • the zinc alkoxide can be zinc methoxide or the like.
  • the zinc compound can be a zinc aryloxide or arylthiolate compound.
  • the zinc aryloxide or arylthiolate is of the following Formula 1 :
  • RB is a hydrogen atom or a linear, cyclic, or branched, saturated or unsaturated, aliphatic hydrocarbon moiety having from 1 to about 30 carbon atoms
  • Y is an oxygen atom or sulfur atom
  • n is an integer from 0 to 2
  • L is a ligand that saturates the coordination sphere of zinc
  • x is an integer from 0 to 4.
  • the ligand, L is selected from the group consisting of water, hydroxide, phosphine, phosphite, ammonia, amino, amido, alkylthiolate, halide, and combinations thereof so long as the zinc species does not contain both sulfur and phosphorus groups.
  • the zinc compound can be a colloidal dispersion of zinc oxide.
  • zinc oxide has the net molecular formula of ZnO, but can comprise repeating [Zn-O- Zn]n units.
  • the colloidal dispersion of zinc oxide will comprise an average nanoparticle size ⁇ 100 nm as determined by microscopic techniques such as TEM.
  • a solvent can be added.
  • US 20160237373, incorporated herein by reference teaches that a C1-C3 alcohol solvent can be used to disperse zinc oxide nanoparticles in oil.
  • the amount of the colloidal dispersion of zinc oxide can be from about 0.01 wt. % to about 5 wt. %.
  • the zinc compound can be a stable colloidal suspension.
  • a stable colloidal suspension of various inorganic oxides. These can be prepared in the presence of an oil phase with a dispersing agent that includes polyalkylene succinic anhydrides, non-nitrogen containing derivatives of a polyalkylene succinic anhydride selected from the group consisting of a polyalkylene succinic acid, a Group I and/or Group II mono- or di-salt of a polyalkylene succinic acid, a polyalkylene succinate ester formed by the reaction of a polyalkylene succinic anhydride or an acid chloride with an alcohol and mixtures thereof, and mixtures thereof and a diluent oil, wherein the stable colloidal suspension is substantially clear.
  • the zinc compound can be a zinc amido compound.
  • the zinc amido compound can be of the form Zn(NRc)»L where Rc is a trimethylsilyl group or a linear, cyclic, or branched, and saturated or unsaturated, aliphatic hydrocarbon moiety having from 1 to about 20 carbon atoms, n is an integer from 0 to 2, L is a ligand that saturates the coordination sphere of zinc, and x is an integer from 0 to 4.
  • the ligand, L is selected from the group consisting of water, hydroxide, phosphine, phosphite, ammonia, amino, amido, alkylthiolate, halide, and combinations thereof so long as the zinc species does not contain both sulfur and phosphorus groups.
  • the zinc compound can be a zinc acetylacetonate compound.
  • the zinc acetylacetonate is of the following Formula 2: (Formula 2),
  • RD can be a symmetric or asymmetric linear, cyclic, or branched, saturated or unsaturated, aliphatic hydrocarbon moiety having from 1 to about 20 carbon atoms, or an aromatic moiety
  • n is an integer from 0 to 2
  • L is a ligand that saturates the coordination sphere of zinc
  • x is an integer from 0 to 4.
  • the ligand, L is selected from the group consisting of water, hydroxide, phosphine, phosphite, ammonia, amino, amido, alkylthiolate, halide, and combinations thereof so long as the zinc species does not contain both sulfur and phosphorus groups.
  • the zinc compound can be a zinc carboxylate.
  • the zinc carboxylate is of the following Formula 3 : (Formula 3),
  • RE can be a linear, cyclic, or branched, saturated or unsaturated, aliphatic hydrocarbon moiety having from 1 to about 50 carbon atoms, or aromatic and alkylaromatic rings with alkyl groups that can be linear, cyclic, or branched, and saturated or unsaturated, aliphatic hydrocarbon moiety having from 1 to about 20 carbon atoms
  • n is an integer from 0 to 2
  • L is a ligand that saturates the coordination sphere of zinc
  • x is an integer from 0 to 4.
  • the zinc carboxylate can form small clusters of the form Zn3(02CRE)6L x .
  • O2CRE can represent a napthenate residue, which is generally understood to be complex mixtures of cycloaliphatic residues obtained by oxidation of naphtha.
  • the ligand, L is selected from the group consisting of water, hydroxide, phosphine, phosphite, ammonia, amino, amido, alkylthiolate, halide, and combinations thereof so long as the zinc species does not contain both sulfur and phosphorus groups.
  • the zinc carboxylate can be zinc stearate or another fatty acid.
  • the zinc carboxylate can also be, for example, zinc octoate or zinc 2-ethylhexanoate.
  • the zinc compound can be a zinc alkylhydroxybenzoate.
  • the zinc salicylate is of the following Formula 4:
  • RF is a hydrogen atom, a linear, cyclic, or branched, saturated or unsaturated, aliphatic hydrocarbon moiety having from 1 to about 30 carbon atoms
  • ? is an integer from 1 to 2
  • n is an integer from 0 to 2
  • L is a ligand that saturates the coordination sphere of zinc
  • x is an integer from 0 to 4.
  • n is an integer from 0 to 2.
  • the ligand, L is selected from the group consisting of water, hydroxide, phosphine, phosphite, ammonia, amino, amido, alkylthiolate, halide, and combinations thereof so long as the zinc species does not contain both sulfur and phosphorus groups.
  • the alkylhydroxybenzoate is a salicylate.
  • alkali earth metals such as magnesium, calcium, strontium, and barium may be added.
  • Alkali earth metals are typically basic salts which can include, but are not limited to, metal oxides, metal alkoxides, metal carbonates, and metal bicarbonates.
  • the zinc compound can be a zinc arylsulfonate.
  • the zinc arylsufonate is of the following Formula 5 : (Formula 5), where RG is a hydrogen atom, a linear, cyclic, or branched, saturated or unsaturated, aliphatic hydrocarbon moiety having from 1 to about 30 carbon atoms, ? is an integer from 1 to 5, n is an integer from 0 to 2, L is a ligand that saturates the coordination sphere of zinc, and x is an integer from 0 to 4. Particularly, n is an integer from 0 to 2. Particularly, ? is 1 or 2.
  • the ligand, L is selected from the group consisting of water, hydroxide, phosphine, phosphite, ammonia, amino, amido, alkylthiolate, halide, and combinations thereof so long as the zinc species does not contain both sulfur and phosphorus groups.
  • alkali earth metals such as magnesium, calcium, strontium, and barium may be added.
  • Alkali earth metals are typically basic salts which can include, but are not limited to, metal oxides, metal alkoxides, metal carbonates, and metal bicarbonates.
  • the zinc compound can be a zinc sulfurized phenate.
  • the zinc sulfurized phenate is of the following Formula 6:
  • RH is a hydrogen atom, a linear, cyclic, or branched, saturated or unsaturated, aliphatic hydrocarbon moiety having from 1 to about 30 carbon atoms
  • x' is an integer from 1 to zinc 8
  • n is an integer from 1 to about 15
  • L is a ligand that saturates the coordination sphere of zinc
  • x is an integer from 0 to 4.
  • n is an integer from 1 to about 5.
  • the ligand, L is selected from the group consisting of water, hydroxide, phosphine, phosphite, ammonia, amino, amido, alkylthiolate, halide, and combinations thereof so long as the zinc species does not contain both sulfur and phosphorus groups.
  • alkali earth metals such as magnesium, calcium, strontium, and barium may be added.
  • Alkali earth metals are typically basic salts which can include, but are not limited to, metal oxides, metal alkoxides, metal carbonates, and metal bicarbonates.
  • the zinc compound can be a zinc dithiocarbamato complex.
  • the zinc dithiocarbamate is of Formula 7: (Formula 7), where each Ri is independently a linear, cyclic, or branched, saturated or unsaturated, aliphatic hydrocarbon moiety having from 1 to about 10 carbon atoms, n is an integer from 0 to 2, L is a ligand that saturates the coordination sphere of zinc, and x is an integer from 0 to 4.
  • the ligand, L is selected from the group consisting of water, hydroxide, ammonia, amino, amido, alkylthiolate, halide, and combinations thereof.
  • the zinc compound can be a salen complex.
  • the zinc salen is of Formula 8:
  • each Rj is independently a hydrogen atom, or a linear, cyclic, or branched, saturated or unsaturated, hydrocarbon moiety having from 1 to about 8 carbon atoms
  • each Y is independently -C(Rj )z where Rj- is a hydrogen atom, a linear, cyclic, or branched, saturated or unsaturated, aliphatic hydrocarbon moiety having from 1 to about 8 carbon atoms, or an aromatic ring
  • z is 1 or 2 when N is imido or amino, respectively
  • each Rj is independently a hydrogen atom, or a linear, cyclic, or branched, saturated or unsaturated, aliphatic chains hydrocarbon moiety having from 1 to about 8 carbon atoms, or taken together with the atoms to which they are connected form a 5-, 6-, or 7-membered ring (can be aromatic, completely saturated, or contain varying levels of unsaturation)
  • n is an integer from 0 to 2
  • L is a ligand that
  • the ligand, L is selected from the group consisting of water, hydroxide, phosphine, phosphite, ammonia, amino, amido, alkylthiolate, halide, and combinations thereof so long as the zinc species does not contain both sulfur and phosphorus groups.
  • the zinc compound can be a bimetallic zinc complex.
  • the bimetallic zinc complex is of Formula 9:
  • RK is a hydrogen atom, or a linear, cyclic, or branched, saturated or unsaturated, hydrocarbon moiety having from 1 to about 30 carbon atoms
  • each RK" is independently a hydrogen atom, a linear, cyclic, or branched, saturated or unsaturated, aliphatic hydrocarbon moiety having from 1 to about 8 carbon atoms, or an aromatic ring
  • each RK' is independently a hydrogen atom, or a linear, cyclic, or branched, saturated or unsaturated, aliphatic hydrocarbon moiety having from 1 to about 8 carbon atoms, or taken together with the atoms to which they are connected form a 5-, 6-, or 7-membered ring (can be completely saturated or contain varying levels of unsaturation)
  • L is a ligand that saturates the coordination sphere of the zincs
  • x is an integer from 0 to 4.
  • the ligand, L is selected from the group consisting of water, hydroxide, phosphine, phosphite, ammonia, amino, amido, alkylthiolate, halide, and combinations thereof so long as the zinc species does not contain both sulfur and phosphorus groups.
  • the zinc compound can be a phosphate ester, phospinate, or phosphinite complex.
  • the zinc phosphate esters, phosphite, phospinates, or phosphinites are of the following FormulalO:
  • each RL is independently a linear, cyclic, or branched, saturated or unsaturated, aliphatic hydrocarbon moiety having from 1 to about 10 carbon atoms, an aromatic ring or an alkoxide moiety, n is an integer from 0 to 2, L is a ligand that saturates the coordination sphere of zinc, and x is an integer from 0 to 4.
  • the zinc phosphate esters, phosphite, phospinates, and phosphinites structures are dimeric with bridging ligand groups.
  • the ligand, L is selected from the group consisting of water, hydroxide, phosphine, phosphite, ammonia, amino, amido, halide, and combinations thereof.
  • the zinc compound can be pyridyl, polypyridyl, and quinolinolato complexes.
  • pyridyl, polypyridyl, and quinolinolato complexes of zinc are of the following Formula 1 1 :
  • RM is independently a hydrogen atom or a linear, cyclic, or branched, saturated or unsaturated, aliphatic hydrocarbon moiety having from 1 to about 10 carbon atoms, a pyridyl ring typically substituted at the 2 position which can be unfuctionalized or can be connected to the other functionalized pyridyl rings to make fused ring systems commonly referred to 8- hydroxyquinolines, quinolines, or phenanthrolines, n is an integer from 0 to 2, L is a ligand that saturates the coordination sphere of zinc, and x is an integer from 0 to 4.
  • the ligand, L is selected from the group consisting of water, hydroxide, phosphine, phosphite, ammonia, amino, amido, alkylthiolate, halide, and combinations thereof so long as the zinc species does not contain both sulfur and phosphorus groups.
  • a zinc reactant can be complexed to a basic nitrogen dispersant succinimide.
  • the basic nitrogen succinimide used to prepare the zinc complexes has at least one basic nitrogen and is preferably oil-soluble.
  • the succinimide compositions may be post- treated with, e.g., boron, using procedures well known in the art so long as the compositions continue to contain basic nitrogen.
  • succinimide The mono and polysuccinimides that can be used to prepare the zinc complexes described herein are disclosed in numerous references and are well known in the art. Certain fundamental types of succinimides and the related materials encompassed by the term of art "succinimide” are taught in U.S. Pat. No's. 3,219,666; 3, 172,892; and 3,272,746, the disclosures of which are hereby incorporated by reference. The term “succinimide” is understood in the art to include many of the amide, imide, and amidine species which may also be formed.
  • succinimide The predominant product however is a succinimide and this term has been generally accepted as meaning the product of a reaction of an alkenyl substituted succinic acid or anhydride with a nitrogen-containing compound.
  • Preferred succinimides because of their commercial availability, are those succinimides prepared from a hydrocarbyl succinic anhydride, wherein the hydrocarbyl group contains from about 24 to about 350 carbon atoms, and an ethylene amine, said ethylene amines being especially characterized by ethylene diamine, diethylene triamine, triethylene tetramine, and tetraethylene pentamine.
  • succinimides prepared from polyisobutenyl succinic anhydride of 70 to 128 carbon atoms and tetraethylene pentamine or triethylene tetramine or mixtures thereof.
  • succinimide also included within the term “succinimide” are the cooligomers of a hydrocarbyl succinic acid or anhydride and a poly secondary amine containing at least one tertiary amino nitrogen in addition to two or more secondary amino groups. Ordinarily this composition has between 1,500 and 50,000 average molecular weight.
  • a typical compound would be that prepared by reacting polyisobutenyl succinic anhydride and ethylene dipiperazine.
  • Succinimides having an average molecular weight of 1000 or 1300 or 2300 and mixtures thereof are most preferred.
  • the amount of the non-sulfur-phosphorus containing zinc compound can be from about 0.001 wt. % to about 25 wt. %, from about 0.05 wt. % to about 20 wt. %, or from about 0.1 wt. % to about 15 wt. %, or from about 0.5 wt. % to about 5 wt. %, from about, 1.0 wt. % to about 4.0 wt. %, based on the total weight of the lubricating oil composition.
  • the present disclosure provides a lubricating engine oil composition for a direct injected, boosted, spark ignited internal combustion engine comprising at least one non-sulfur- phosphorus containing zinc compound.
  • the amount of metal from the at least one non-sulfur-phosphorus containing zinc compound is from about 200 to about 3000 ppm, or from about 250 to about 3000 ppm, from about 300 to about 3000 ppm, from about 350 to about 3000 ppm, from about 400 ppm to about 3000 ppm, from about 500 to about 3000 ppm, from about 600 to about 3000 ppm, from about 700 to about 3000 ppm, from about 900 to about 3000, from about 950 to about 3000 ppm, from about 1000 to 3000 ppm, from about 1050 to about 3000 ppm, from about 1100 to about 3000 ppm, from about 1200 to about 3000 ppm, from about 1300 to about 3000 ppm, from about 1400 to about
  • the present disclosure provides a lubricating engine oil composition for a direct injected, boosted, spark ignited internal combustion engine comprising at least one non-sulfur- phosphorus containing zinc compound and a ZnDTP.
  • the amount of metal from the at least one non-sulfur-phosphorus containing zinc compound and ZnDTP is from about 700 to about 4000 ppm, or from about 800 to about 4000 ppm, from about 900 to about 4000, from about 950 to about 4000 ppm, from about 1000 to 4000 ppm, from about 1050 to about 4000 ppm, from about 1100 to about 4000 ppm, from about 1200 to about 4000 ppm, from about 1300 to about 4000 ppm, from about 1400 to about 4000 ppm, or from about 1400 to 4000 ppm.
  • the present disclosure provides a method for improving deposit control performance while at the same time preventing or reducing low speed pre-ignition in a direct injected, boosted, spark ignited internal combustion engine, said method comprising the step of lubricating the crankcase of the engine with a lubricating oil composition comprising at least one non-sulfur-phosphorus containing zinc compound.
  • the zinc compounds does not contain sulfur or phosphorus.
  • the zinc compound is a zinc carboxylate as described herein.
  • the amount of the non-sulfur-phosphorus containing zinc compound can be from about 0.001 wt. % to about 25 wt. %, from about 0.05 wt. % to about 20 wt. %, or from about 0.1 wt. % to about 15 wt. %, or from about 0.1 wt. % to about 5 wt. %, from about, 0.1 wt. % to about 4.0 wt. %, based on the total weight of the lubricating oil composition.
  • the non-sulfur-phosphorus containing zinc compound can be combined with conventional lubricating oil detergent additives which contain magnesium and/or calcium.
  • the calcium detergent(s) can be added in an amount sufficient to provide the lubricating oil composition from 0 to about 2400 ppm of calcium metal, from 0 to about 2200 ppm of calcium metal, from 100 to about 2000 ppm of calcium metal, from 200 to about 1800 ppm of calcium metal, or from about 100 to about 1800 ppm, or from about 200 to about 1500 ppm, or from about 300 to about 1400 ppm, or from about 400 to about 1400 ppm, of calcium metal in the lubricating oil composition.
  • the magnesium detergent(s) can be added in an amount sufficient to provide the lubricating oil composition from about 100 to about 1000 ppm of magnesium metal, or from about 100 to about 600 ppm, or from about 100 to about 500 ppm, or from about 200 to about 500 ppm of magnesium metal in the lubricating oil composition.
  • the non-sulfur-phosphorus containing zinc compound can be combined with conventional lubricating oil detergent additives which contain lithium.
  • the lithium detergent(s) can be added in an amount sufficient to provide the lubricating oil composition from 0 to about 2400 ppm of lithium metal, from 0 to about 2200 ppm of lithium metal, from 100 to about 2000 ppm of lithium metal, from 200 to about 1800 ppm of lithium metal, or from about 100 to about 1800 ppm, or from about 200 to about 1500 ppm, or from about 300 to about 1400 ppm, or from about 400 to about 1400 ppm, of lithium metal in the lubricating oil composition.
  • the non-sulfur-phosphorus containing zinc compound can be combined with conventional lubricating oil detergent additives which contain sodium.
  • the sodium detergent(s) can be added in an amount sufficient to provide the lubricating oil composition from 0 to about 2400 ppm of sodium metal, from 0 to about 2200 ppm of sodium metal, from 100 to about 2000 ppm of sodium metal, from 200 to about 1800 ppm of sodium metal, or from about 100 to about 1800 ppm, or from about 200 to about 1500 ppm, or from about 300 to about 1400 ppm, or from about 400 to about 1400 ppm, of sodium metal in the lubricating oil composition.
  • the non-sulfur-phosphorus containing zinc compound can be combined with conventional lubricating oil detergent additives which contain potassium.
  • the potassium detergent(s) can be added in an amount sufficient to provide the lubricating oil composition from 0 to about 2400 ppm of potassium metal, from 0 to about 2200 ppm of potassium metal, from 100 to about 2000 ppm of potassium metal, from 200 to about 1800 ppm of potassium metal, or from about 100 to about 1800 ppm, or from about 200 to about 1500 ppm, or from about 300 to about 1400 ppm, or from about 400 to about 1400 ppm, of potassium metal in the lubricating oil composition.
  • the disclosure provides a lubricating engine oil composition
  • a lubricating engine oil composition comprising a lubricating oil base stock as a major component; and at least one non-sulfur-phosphorus containing zinc compound, as a minor component; and wherein the engine exhibits greater than 50% reduced low speed pre-ignition, based on normalized low speed pre-ignition (LSPI) counts per 100,000 engine cycles, engine operation at between 500 and 3,000 revolutions per minute and brake mean effective pressure (BMEP) between 10 and 30 bar, as compared to low speed pre-ignition performance achieved in an engine using a lubricating oil that does not comprise the at least one non-sulfur-phosphorus containing zinc compound.
  • LSPI normalized low speed pre-ignition
  • BMEP brake mean effective pressure
  • the disclosure provides a lubricating engine oil composition for use in a down- sized boosted engine comprising a lubricating oil base stock as a major component; and at least one non-sulfur-phosphorus containing zinc compound, as a minor component; where the downsized engine ranges from about 0.5 to about 3.6 liters, from about 0.5 to about 3.0 liters, from about 0.8 to about 3.0 liters, from about 0.5 to about 2.0 liters, or from about 1.0 to about 2.0 liters.
  • the engine can have two, three, four, five or six cylinders.
  • the present disclosure provides the use of a at least one non-sulfur-phosphorus containing zinc compound for preventing or reducing low speed pre-ignition in a direct injected, boosted, spark ignited internal combustion engine.
  • the lubricating oil composition can comprise additional lubricating oil additives.
  • the lubricating oil compositions of the present disclosure may also contain other conventional additives that can impart or improve any desirable property of the lubricating oil composition in which these additives are dispersed or dissolved.
  • Any additive known to a person of ordinary skill in the art may be used in the lubricating oil compositions disclosed herein.
  • Some suitable additives have been described in Mortier et al., “Chemistry and Technology of Lubricants", 2nd Edition, London, Springer, (1996); and Leslie R. Rudnick, "Lubricant Additives: Chemistry and Applications", New York, Marcel Dekker (2003), both of which are incorporated herein by reference.
  • the lubricating oil compositions can be blended with antioxidants, anti-wear agents, metal detergents, rust inhibitors, dehazing agents, demulsifying agents, metal deactivating agents, friction modifiers, pour point depressants, antifoaming agents, co-solvents, corrosion-inhibitors, ashless dispersants, multifunctional agents, dyes, extreme pressure agents and the like and mixtures thereof.
  • antioxidants anti-wear agents, metal detergents, rust inhibitors, dehazing agents, demulsifying agents, metal deactivating agents, friction modifiers, pour point depressants, antifoaming agents, co-solvents, corrosion-inhibitors, ashless dispersants, multifunctional agents, dyes, extreme pressure agents and the like and mixtures thereof.
  • additives are known and commercially available. These additives, or their analogous compounds, can be employed for the preparation of the lubricating oil compositions of the disclosure by the usual blending procedures.
  • the lubricating oil composition of the present invention can contain one or more detergents.
  • Metal -containing or ash-forming detergents function as both detergents to reduce or remove deposits and as acid neutralizes or rust inhibitors, thereby reducing wear and corrosion and extending engine life.
  • Detergents generally comprise a polar head with a long hydrophobic tail.
  • the polar head comprises a metal salt of an acidic organic compound.
  • the salts may contain a substantially stoichiometric amount of the metal in which case they are usually described as normal or neutral salts.
  • a large amount of a metal base may be incorporated by reacting excess metal compound (e.g., an oxide or hydroxide) with an acidic gas (e.g., carbon dioxide).
  • Detergents that may be used include oil-soluble neutral and overbased sulfonates, phenates, suffurized phenates, thiophosphonates, salicylates, and naphtheiiates and other oil-soluble carboxylates of a metal, particularly the alkali or alkaline earth metals, e.g., barium, sodium, potassium, lithium, calcium, and magnesium.
  • a metal particularly the alkali or alkaline earth metals, e.g., barium, sodium, potassium, lithium, calcium, and magnesium.
  • the most commonly used metals are calcium and magnesium, which may both be present in detergents used in a lubricant, and mixtures of calcium and/or magnesium with sodium.
  • the lubricating oil composition of the present invention can contain one or more anti-wear agents that can reduce friction and excessive wear.
  • any anti-wear agent known by a person of ordinary skill in the art may be used in the lubricating oil composition.
  • suitable anti-wear agents include zinc dithiophosphate, metal (e.g., Pb, Sb, Mo and the like) salts of dithiophosphates, metal (e.g., Zn, Pb, Sb, Mo and the like) salts of dithiocarbamates, metal (e.g., Zn, Pb, Sb and the like) salts of fatty acids, boron compounds, phosphate esters, phosphite esters, amine salts of phosphoric acid esters or thiophosphoric acid esters, reaction products of dicyclopentadiene and thiophosphoric acids and combinations thereof.
  • the amount of the anti-wear agent may vary from about 0.01 wt. % to about 5 wt. %, from about 0.05 wt. % to about 3 wt. %, or from about 0.1 wt. % to about 1 wt. %, based on the total weight of the lubricating oil composition.
  • the anti-wear agent is or comprises a dihydrocarbyl dithiophosphate metal salt, such as zinc dialkyl dithiophosphate compounds.
  • the metal of the dihydrocarbyl dithiophosphate metal salt may be an alkali or alkaline earth metal, or aluminum, lead, tin, molybdenum, manganese, nickel or copper. In some embodiments, the metal is zinc.
  • the alkyl group of the dihydrocarbyl dithiophosphate metal salt has from about 3 to about 22 carbon atoms, from about 3 to about 18 carbon atoms, from about 3 to about 12 carbon atoms, or from about 3 to about 8 carbon atoms. In further embodiments, the alkyl group is linear or branched.
  • the amount of the dihydrocarbyl dithiophosphate metal salt including the zinc dialkyl dithiophosphate salts in the lubricating oil composition disclosed herein is measured by its phosphorus content.
  • the phosphorus content of the lubricating oil composition disclosed herein is from about 0.01 wt. % to about 0.14 wt. %, based on the total weight of the lubricating oil composition.
  • the lubricating oil composition of the present invention can contain one or more friction modifiers that can lower the friction between moving parts.
  • Any friction modifier known by a person of ordinary skill in the art may be used in the lubricating oil composition.
  • suitable friction modifiers include fatty carboxylic acids; derivatives (e.g., alcohol, esters, borated esters, amides, metal salts and the like) of fatty carboxylic acid; mono-, di- or tri-alkyl substituted phosphoric acids or phosphonic acids; derivatives (e.g., esters, amides, metal salts and the like) of mono-, di- or tri-alkyl substituted phosphoric acids or phosphonic acids; mono-, di- or tri-alkyl substituted amines; mono- or di-alkyl substituted amides and combinations thereof.
  • examples of friction modifiers include, but are not limited to, alkoxylated fatty amines; borated fatty epoxides; fatty phosphites, fatty epoxides, fatty amines, borated alkoxylated fatty amines, metal salts of fatty acids, fatty acid amides, glycerol esters, borated glycerol esters; and fatty imidazolines as disclosed in U.S. Patent No.
  • friction modifiers obtained from a reaction product of a C4 to C75, or a CG to C24, or a CG to C20, fatty acid ester and a nitrogen-containing compound selected from the group consisting of ammonia, and an alkanolamine and the like and mixtures thereof.
  • the amount of the friction modifier may vary from about 0.01 wt. % to about 10 wt. %, from about 0.05 wt. % to about 5 wt. %, or from about 0.1 wt. % to about 3 wt. %, based on the total weight of the lubricating oil composition.
  • the lubricating oil composition of the disclosure can contain a molybdenum-containing friction modifier.
  • the molybdenum-containing friction modifier can be any one of the known molybdenum-containing friction modifiers or the known molybdenum-containing friction modifier compositions.
  • Preferred molybdenum-containing friction modifier is, for example, sulfurized oxymolybdenum dithiocarbamate, sulfurized oxymolybdenum dithiophosphate, amine- molybdenum complex compound, oxymolybdenum diethylate amide, and oxymolybdenum monoglyceride. Most preferred is a molybdenum dithiocarbamate friction modifier.
  • the lubricating oil composition of the invention generally contains the molybdenum- containing friction modifier in an amount of 0.01 to 0.15 wt. % in terms of the molybdenum content.
  • the lubricating oil composition of the invention preferably contains an organic oxidation inhibitor in an amount of 0.01-5 wt. %, preferably 0.1-3 wt. %.
  • the oxidation inhibitor can be a hindered phenol oxidation inhibitor or a diarylamine oxidation inhibitor.
  • the diarylamine oxidation inhibitor is advantageous in giving a base number originating from the nitrogen atoms.
  • the hindered phenol oxidation inhibitor is advantageous in producing no NOx gas.
  • hindered phenol oxidation inhibitors examples include 2,6-di-t-butyl-p-cresol, 4,4'- methylenebis(2,6-di-t-butylphenol), 4,4'-methylenebis(6-t-butyl-o-cresol), 4,4'- isopropylidenebis(2,6-di-t-butylphenol), 4,4'-bis(2,6-di-t-butylphenol), 2,2'-methylenebis(4- methyl-6-t-butylphenol), 4,4'-thiobis(2-methyl-6-t-butylphenol), 2,2-thio-diethylenebis[3- (3 ,5 -di-t-butyl-4-hydroxyphenyl)propionate] , octyl 3 -(3 ,5 -di-t-butyl-4- hydroxyphenyl)propionate, octadecyl 3-(3,5-di-t-butyl
  • diarylamine oxidation inhibitors examples include alkyldiphenylamine having a mixture of alkyl groups of 4 to 9 carbon atoms, ⁇ , ⁇ '-dioctyldiphenylamine, phenyl-naphthylamine, phenyl -naphthylamine, alkylated-naphthylamine, and alkylated phenyl-naphthylamine.
  • Each of the hindered phenol oxidation inhibitor and diarylamine oxidation inhibitor can be employed alone or in combination. If desired, other oil soluble oxidation inhibitors can be employed in combination with the above-mentioned oxidation inhibitor(s).
  • the lubricating oil composition of the invention may further contain an oxymolybdenum complex of succinimide, particularly a sulfur-containing oxymolybdenum complex of succinimide.
  • the sulfur-containing oxymolybdenum complex of succinimide can provide increased oxidation inhibition when it is employed in combination with the above-mentioned phenolic or amine oxidation inhibitors.
  • additives in the form of 10 to 80 wt. % active ingredient concentrates in hydrocarbon oil, e.g. mineral lubricating oil, or other suitable solvent.
  • concentrates may be diluted with 3 to 100, e.g., 5 to 40, parts by weight of lubricating oil per part by weight of the additive package in forming finished lubricants, e.g. crankcase motor oils.
  • the purpose of concentrates is to make the handling of the various materials less difficult and awkward as well as to facilitate solution or dispersion in the final blend.
  • the lubricating oil compositions disclosed herein can be prepared by any method known to a person of ordinary skill in the art for making lubricating oils.
  • the base oil can be blended or mixed with the non-sulfur-phosphorus containing zinc compound described herein.
  • one or more other additives in additional to the non-sulfur- phosphorus containing zinc compound can be added.
  • the non-sulfur-phosphorus containing zinc compound and the optional additives may be added to the base oil individually or simultaneously.
  • the non-sulfur-phosphorus containing zinc compound and the optional additives are added to the base oil individually in one or more additions and the additions may be in any order.
  • the non-sulfur-phosphorus containing zinc compound and the additives are added to the base oil simultaneously, optionally in the form of an additive concentrate.
  • the solubilizing of the non-sulfur-phosphorus containing zinc compound or any solid additives in the base oil may be assisted by heating the mixture to a temperature from about 25 °C to about 200 °C, from about 50 °C to about 150 °C or from about 75 °C to about 125 °C.
  • Any mixing or dispersing equipment known to a person of ordinary skill in the art may be used for blending, mixing or solubilizing the ingredients.
  • the blending, mixing or solubilizing may be carried out with a blender, an agitator, a disperser, a mixer (e.g., planetary mixers and double planetary mixers), a homogenizer (e.g., Gaulin homogenizers and Rannie homogenizers), a mill (e.g., colloid mill, ball mill and sand mill) or any other mixing or dispersing equipment known in the art.
  • the lubricating oil composition disclosed herein may be suitable for use as motor oils (that is, engine oils or crankcase oils), in a spark-ignited internal combustion engine, particularly a direct injected, boosted, engine that is susceptible to low speed pre-ignition.
  • motor oils that is, engine oils or crankcase oils
  • spark-ignited internal combustion engine particularly a direct injected, boosted, engine that is susceptible to low speed pre-ignition.
  • the base line formulation contained a Group 3 base oil, mixture of primary and secondary dialkyl zinc dithiophosphates in an amount to provide 770 ppm phosphorus and 890 ppm Zn to the lubricating oil composition, mixture of polyisobutenyl succinimide dispersants (borated and ethylene carbonate post-treated), a molybdenum succinimide complex in an amount to provide 180 ppm molybdenum to the lubricating oil composition, alkylated diphenylamine antioxidant, a borated friction modifier, foam inhibitor, a pour point depressant, and an olefin copolymer viscosity index improver.
  • the lubricating oil compositions were blended into a 5W-30 viscosity grade oil.
  • the zinc compound A was prepared a from a C14-C18 alkylphenol with CO2 and ZnO to form a low overbased Zn Salicylate (3.8% Zn) with a TBN of 66 based on the additive concentrate (35% diluent oil).
  • Zinc compound B was prepared a from a C14-C18 alkylphenol with CO2 and ZnO to form a low overbased Zn Salicylate (3.8% Zn) with a TBN of 66 based on the additive concentrate (35% diluent oil).
  • the zinc compound B is a Zinc dithiocarbamate (i.e., (bis((dibutylcarbamothioyl)thio) zinc)) (13.79% Zn).
  • the zinc compound C is a Zinc 2-ethylhexanoate (17.86% Zn).
  • a lubricating oil composition was prepared by adding 1809 ppm of the zinc compound A and 2177 ppm of calcium from a combination of overbased Ca sulfonate and phenate detergents to the baseline formulation.
  • a lubricating oil composition was prepared by adding 1798 ppm of the zinc compound B and 2320 ppm of calcium from a combination of overbased Ca sulfonate and phenate detergents to the baseline formulation.
  • a lubricating oil composition was prepared by adding 1616 ppm of the zinc compound C and 2177 ppm of calcium from a combination of overbased Ca sulfonate and phenate detergents to the baseline formulation.
  • a lubricating oil composition was prepared by adding 774 ppm of the zinc compound C and 1860 ppm of calcium from a combination of overbased Ca sulfonate and phenate detergents to the baseline formulation.
  • Example 5 A lubricating oil composition was prepared by adding 774 ppm of the zinc compound C and 1860 ppm of calcium from a combination of overbased Ca sulfonate and phenate detergents to the baseline formulation.
  • a lubricating oil composition was prepared by adding 1626 ppm of the zinc compound C and 1935 ppm of calcium from a combination of overbased Ca sulfonate and phenate detergents to the baseline formulation.
  • a lubricating oil composition was prepared by adding 2488 ppm of the zinc compound C and 2150 ppm of calcium from a combination of overbased Ca sulfonate and phenate detergents to the baseline formulation.
  • a lubricating oil composition was prepared by adding 2148 ppm of calcium from a combination of overbased Ca sulfonate phenate detergents to the baseline formulation.
  • a lubricating oil composition was prepared by adding 1858 ppm of calcium from a combination of overbased Ca sulfonate phenate detergents to the baseline formulation.
  • the Ford LSPI test is operated in four-4 hours iterations.
  • the engine is operated at 1750 rpm and 1.7 MPa break mean effective pressure (BMEP) with an oil sump temperature of 95 °C
  • BMEP break mean effective pressure
  • the engine is run for 175,000 combustion cycles in each stage.
  • LSPI events are determined by monitoring peak cylinder pressure (PP) and mass fraction burn (MFB) of the fuel charge in the cylinder. When either or both criteria are met, it can be said that an LSPI event has occurred.
  • the threshold for peak cylinder pressure varies by test, but is typically 4-5 standard deviations above the average cylinder pressure. Likewise, the MFB threshold is typically 4-5 standard deviations earlier than the average MFB (represented in crank angle degrees).
  • LSPI events can be reported as average events per test, events per 100,000 combustion cycles, events per cycle, and/or combustion cycles per event. The results for this test is shown below.
  • GM 2.0 L LHU 4-cylinder gasoline turbocharged direct-injected engine was used for LSPI testing.
  • Each cylinder was equipped with a combustion pressure sensor.
  • the data shows that Applicant's inventive example comprising a non-sulfur-phosphorus zinc compound provided significantly better LSPI performance both in terms of number of events but also the severity of LSPI events than the baseline example which did not contain the non- sulfur-phosphorus containing zinc compound in the Ford engines.

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PCT/IB2018/055118 2017-07-14 2018-07-11 LUBRICATING OIL COMPOSITIONS AND METHOD FOR PREVENTING OR REDUCING LOW SPEED PRE-LIGHTING IN DIRECT INJECTION SPARK IGNITION ENGINES WO2019012450A1 (en)

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CA3069627A CA3069627A1 (en) 2017-07-14 2018-07-11 Lubricating oil compositions containing non-sulfur-phosphorus containing zinc compounds and method for preventing or reducing low speed pre-ignition in direct injected spark-ignited engines
CN201880055665.9A CN111032836A (zh) 2017-07-14 2018-07-11 含有不含硫-磷的锌化合物的润滑油组合物和用于防止或减少直喷式火花点火发动机中低速提前点火的方法
EP18752276.8A EP3652282A1 (en) 2017-07-14 2018-07-11 Lubricating oil compositions containing non-sulfur-phosphorus containing zinc compounds and method for preventing or reducing low speed pre-ignition in direct injected spark-ignited engines
SG11202000337PA SG11202000337PA (en) 2017-07-14 2018-07-11 Lubricating oil compositions containing non-sulfur-phosphorus containing zinc compounds and method for preventing or reducing low speed pre-ignition in direct injected spark-ignited engines
JP2020501227A JP7221271B2 (ja) 2017-07-14 2018-07-11 硫黄リン非含有亜鉛化合物を含有する潤滑油組成物、および直接噴射火花点火式エンジンにおける低速早期着火を防止または低減する方法

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