EP1209219B1 - Schmierölzusammensetzungen - Google Patents

Schmierölzusammensetzungen Download PDF

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Publication number
EP1209219B1
EP1209219B1 EP01204513.4A EP01204513A EP1209219B1 EP 1209219 B1 EP1209219 B1 EP 1209219B1 EP 01204513 A EP01204513 A EP 01204513A EP 1209219 B1 EP1209219 B1 EP 1209219B1
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EP
European Patent Office
Prior art keywords
composition
oil
dispersant
lubricating oil
mass
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
EP01204513.4A
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English (en)
French (fr)
Other versions
EP1209219A1 (de
Inventor
Laurent Chambard
Adrian Dunn
Terence Garner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Infineum International Ltd
Original Assignee
Infineum International Ltd
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Filing date
Publication date
Priority claimed from EP00204222A external-priority patent/EP1209218A1/de
Application filed by Infineum International Ltd filed Critical Infineum International Ltd
Priority to EP01204513.4A priority Critical patent/EP1209219B1/de
Publication of EP1209219A1 publication Critical patent/EP1209219A1/de
Application granted granted Critical
Publication of EP1209219B1 publication Critical patent/EP1209219B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • C10M159/22—Reaction mixtures having an excess of neutralising base, e.g. so-called overbasic or highly basic products containing phenol radicals
    • 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

Definitions

  • This invention relates to a lubricating oil composition suitable for a medium speed 4-stroke trunk piston compression-ignited (diesel) marine enigne.
  • marine does not restrict the engines to those used in water-borne vessels; as is understood in the art, it also includes those for auxiliary power generation applications and for main propulsion stationary land-based engines of the above types for power-generation.
  • Lubricating oil compositions (or lubricants) for trunk piston engines are known and may be referred to as trunk piston engine oils or TPEO's. They are known to include, as additives to improve their performance, ashless dispersants and overbased detergents.
  • EP-A-0-662 508 describes use of a composition that includes a hydrocarbyl-substituted phenate concentrate having a TBN greater than 300, and at least one of a hydrocarbyl-substituted salicylate and a hydrocarbyl-substituted sulphonate.
  • the composition also includes a dispersant to minimise deposit formation in various parts of the engine.
  • EP-A-1 046 698 teaches marine diesel engine oils comprising ashless dispersant and overbased metal detergent derived from one or more surfactants. It has now surprisingly been found that a dispersant-free or low dispersant TPEO, wherein the metal detergent is a complex detergent, provides excellent performance in the area of piston cleanliness.
  • a first aspect of the invention is a lubricating oil composition for a medium speed 4-stroke trunk piston compression-ignited (diesel) marine engine, comprising an admixture of:
  • a second aspect of the present invention is the use of additive (B) as defined in the first aspect of the invention in a lubricating oil composition that is dispersant-free or contains 0.5 mass % of a dispersant and that has a TBN in the range of 8 to 100, to control piston undercrown deposits when the composition is used in a medium speed 4-stroke trunk piston compression-ignited marine engine.
  • a third aspect of the present invention is a method of lubricating a medium speed 4-stroke trunk piston compression-ignited marine engine which comprises supplying to the engine the lubricating oil composition according to the first aspect of the invention.
  • Major amount means in excess of 50 mass % of the composition.
  • Minor amount means less than 50 mass % of the composition, both in respect of the stated additive and in respect of the total mass % of all the additives present in the composition, reckoned as active ingredient of the additive or additives.
  • TBN Total Base Number
  • Viscosity index is as defined by ASTM D2270.
  • the lubricating oil composition of the present invention may be suitable for use in a 4-stroke trunk piston engine having an engine speed of 200 to 2,000 e.g. 400 to 1,000, rpm, and a brake horse-power (BHP) per cylinder of 50 to 5,000 such as up to 3,000, preferably 100 to 2,000 or to 3,000.
  • BHP brake horse-power
  • the TBN of the lubricant composition is, as stated, in the range of from 3.5 to 100, preferably 8 to 100, and more preferably 10 to 60.
  • the viscosity index of the lubricant composition is at least 90, more preferably at least 95, and at most 140 such as 120, preferably 110.
  • a preferred viscosity index range is from 95 to 115.
  • the lubricant composition may, for example, have a kinematic viscosity at 100°C (as measured by ASTM D445) of at least 9, preferably at least 13, more preferably in the range of from 14 to 24, for example from 14 to 22, mm 2 s -1 .
  • the present invention may alleviate the problem.
  • the oil of lubricating viscosity may be any oil suitable for the lubrication of a trunk piston engine.
  • the lubricating oil may suitably be an animal, a vegetable or a mineral oil.
  • the lubricating oil is a petroleum-derived lubricating oil, such as a naphthenic base, paraffinic base or mixed base oil.
  • the lubricating oil may be a synthetic lubricating oil.
  • Suitable synthetic lubricating oils include synthetic ester lubricating oils, which oils include diesters such as di-octyl adipate, di-octyl sebacate and tridecyl adipate, or polymeric hydrocarbon lubricating oils, for example liquid polyisobutene and poly-alpha olefins. Commonly, a mineral oil is employed.
  • the lubricating oil may generally comprise greater than 60, typically greater than 70, mass % of the composition, and typically have a kinematic viscosity at 100°C of from 2 to 40, for example for 3 to 15, mm 2 s -1 and a viscosity index of from 80 to 100, for example from 90 to 95.
  • hydrocracked oils Another class of lubricating oils is hydrocracked oils, where the refining process further breaks down the middle and heavy distillate fractions in the presence of hydrogen at high temperatures and moderate pressures.
  • Hydrocracked oils typically have a kinematic viscosity at 100°C of from 2 to 40, for example from 3 to 15, mm 2 s -1 and a viscosity index typically in the range of from 100 to 110, for example from 105 to 108.
  • 'brightstock' refers to base oils which are solvent-extracted, de-asphalted products from vacuum residuum generally having a kinematic viscosity at 100°C of from 28 to 36 mm 2 s -1 and are typically used in a proportion of less than 30, preferably less than 20, more preferably less than 15, most preferably less than 10, such as less than 5, mass %, based on the mass of the composition.
  • compositions are either totally free of dispersants or contain less than 0.5, mass % of dispersant. More preferably, the compositions include less than 0.4, more preferably less than 0.3, more preferably less than 0.2, even more preferably less than 0.1 and most preferably less than 0.01, mass % of dispersant.
  • a dispersant is an additive for a lubricating composition whose primary function is to hold solid and liquid contaminants in suspension, thereby passivating them and reducing engine deposits at the same time as reducing sludge depositions.
  • a dispersant maintains in suspension oil-insoluble substances that result from oxidation during use of the lubricating oil, thus preventing sludge flocculation and precipitation or deposition on metal parts of the engine.
  • the composition preferably includes less than 0.015 %, preferably less than 0.011%, more preferably less than 0.007%, even more preferably less than 0.004%, and most preferably less than 0.0004%, by mass of nitrogen.
  • Ashless dispersants comprise a long chain hydrocarbon with a polar head, the polarity being derived from inclusion of, e.g. an O, P or N atom.
  • the hydrocarbon is an oleophilic group that confers oil-solubility, having for example 40 to 500 carbon atoms.
  • ashless dispersants may comprise an oil-soluble polymeric hydrocarbon backbone having functional groups that are capable of associating with particles to be dispersed.
  • a detergent is an additive that reduces formation of piston deposits, for example high-temperature varnish and lacquer deposits, in engines; it has acid-neutralising properties and is capable of keeping finely divided solids in suspension. It is based on metal "soaps", that is metal salts of acidic organic compounds, sometimes referred to as surfactants.
  • the detergent comprises a polar head with a long hydrophobic tail, the polar head comprises a metal salt of the acid in compound.
  • Large amounts of a metal base are included by reacting an excess of a metal compound, such as an oxide or hydroxide, with an acidic gas such as carbon dioxide to give an overbased detergent which comprises neutralised detergent as the outer layer of a metal base (e.g. carbonate) micelle.
  • a metal compound such as an oxide or hydroxide
  • an acidic gas such as carbon dioxide
  • the overbased detergents of this invention may have a TBN in the range of 200 to 500, preferably 250 to 400.
  • the detergent is in the form of a complex wherein the basic material is stabilised by more than one surfactant.
  • complexes are distinguished from mixtures of two or more separate overbased detergents, an example of such a mixture being one of an overbased salicylate detergent with an overbased phenate detergent.
  • EP-A-0 750 659 describes a calcium salicylate phenate complex made by carboxylating a calcium phenate and then sulfurising and overbasing the mixture of calcium salicylate and calcium phenate.
  • Such complexes may be referred to as "phenalates"
  • the metal may be an alkali or alkaline earth metal, e.g., sodium, potassium, lithium, calcium, and magnesium. Calcium is preferred.
  • Surfactants that may be used include organic carboxylates, such as salicylates, non-sulfurised or sulfurised; sulfonates; phenates, non-sulfurised or sulfurised; thiophosphonates; and naphthenates.
  • the surfactants may be salicylate and phenate.
  • Surfactants for the surfactant system of the overbased metal detergent may contain a least one hydrocarbyl group, for example, as a substituent on an aromatic ring.
  • hydrocarbyl as used herein means that the group concerned is primarily composed of hydrogen and carbon atoms and is bonded to the remainder of the molecule via a carbon atom, but does not exclude the presence of other atoms or groups in a proportion insufficient to detract from the substantially hydrocarbon characteristics of the group.
  • hydrocarbyl groups in surfactants for use in accordance with the invention are aliphatic groups, preferably alkyl or alkylene groups, especially alkyl groups, which may be linear or branched. The total number of carbon atoms in the surfactants should be at least sufficient to impact the desired oil-solubility.
  • the complex detergent may be used in a proportion in the range of 0.1 to 30, preferably 2 to 15 or to 20, mass % based on the mass of the lubricating oil composition.
  • additives such as known in the art, may be incorporated into the lubricating oil compositions of the invention. They may, for example, include other overbased metal detergents that are not complex detergents, for example alkaline earth metal (eg Ca or Mg) phenates or salicylates; anti-wear agents; anti-oxidants; pour point depressants; anti-foamants; and/or demulsifiers.
  • alkaline earth metal eg Ca or Mg
  • anti-wear additives will be described in further detail as follows:
  • Dihydrocarbly dithiophosphate metal salts constitute a known class of anti-wear additive.
  • the metal in the dihydrocarbyl dithiophosphate metal may be an alkali or alkaline earth metal, or aluminium, lead, tin, molybdenum, manganese, nickel or copper.
  • Zinc salts are preferred, preferably in the range of 0.1 to 1.5, preferably 0.5 to 1.3, mass %, based upon the total mass of the lubricating oil composition. They may be prepared in accordance with known techniques by first forming a dihydrocarbyl dithiophosphoric acid (DDPA), usually by reaction of one or more alcohol or a phenol with P 2 S 5 and then neutralizing the formed DDPA with a zinc compound.
  • DDPA dihydrocarbyl dithiophosphoric acid
  • a dithiophosphoric acid may be made by reacting mixtures of primary and secondary alcohols.
  • multiple dithiophosphoric acids can be prepared comprising both hydrocarbyl groups that are entirely secondary in character and hydrocarbyl groups that are entirely primary in character.
  • any basic or neutral zinc compound may be used but the oxides, hydroxides and carbonates are most generally employed. Commercial additives frequently contain an excess of zinc due to use of an excess of the basic zinc compound in the neutralisation reaction.
  • the preferred zinc dihydrocarbyl dithiophosphates are oil-soluble salts of dihydrocarbyl dithiophosphoric acids and may be represented by the following formula: [(RO)(R 1 O)P(S)S] 2 Zn where R and R 1 may be the same or different hydrocarbyl radicals containing from 1 to 18, preferably 2 to 12, carbon atoms and including radicals such as alkyl, alkenyl, aryl, arylalkyl, alkaryl and cycloaliphatic radicals. Particularly preferred as R and R 1 groups are alkyl groups of 2 to 8 carbon atoms.
  • the radicals may, for example, be ethyl, n-propyl, I-propyl, n-butyl, I-butyl, sec-butyl, amyl, n-hexyl, I-hexyl, n-octyl, decyl, dodecyl, octadecyl, 2-ethylehexyl, phenyl, butylphenyl, cyclohexyl, methylcyclopentyl, propenyl, butenyl.
  • the total number of carbon atoms (i.e. in R and R 1 ) in the dithiophoshoric acid will generally be 5 or greater.
  • the zinc dihydrocarbyl dithiophosphate can therefore comprise zinc dialkyl dithiophosphates.
  • additive (B) and other additives can be added simultaneously to the oil of lubricating viscosity (or base oil) to form the lubricating oil composition. Dissolution of the additive package(s) into the lubricating oil may be facilitated by solvents and by mixing accompanied with mild heating, but this is not essential.
  • the additive package(s) will typically be formulated to contain the additive(s) in proper amounts to provide the desired concentration, and/or to carry out the intended function in the final formulation when the additive package(s) is/are combined with a predetermined amount of base lubricant.
  • additive (B) and others may be admixed with small amounts of base oil or other compatible solvents together with other desirable additives to form additive packages containing active ingredients in an amount, based on the additive package, of, for example, from 2.5 to 90, preferably from 5 to 75, most preferably from 8 to 60, mass % of additives in the appropriate proportions, the remainder being base oil.
  • the final formulations may typically contain about 5 to 40 mass % of the additive packages(s), the remainder being base oil.
  • 'active ingredient' refers to the additive material that is not diluent.
  • 'oil-soluble' or 'oil-dispersable' do not necessarily indicate that the compounds or additives are soluble, dissolvable, miscible or capable of being suspended in the base oil in all proportions. These do mean, however, that they are, for instance, soluble or stably dispersible in oil to an extent sufficient to exert their intended effect in the environment in which the oil is employed. Moreover, the additional incorporation of other additives may also permit incorporation of higher levels of a particular additive, if desired.
  • the lubricant compositions of this invention comprise defined individual (i.e. separate) components that may or may not remain the same chemically before and after mixing.
  • Lubricant compositions as trunk piston marine diesel lubricating oils, were prepared by admixing with a basestock one or more of the components B1 to B6 and optionally the dispersant (D). The admixing was carried out at elevated temperature. Four compositions were prepared, two (Oils 1 and 2) being oils of the invention, and two (Reference Oils 1 and 2) being for comparison. Reference Oil 3, a commercially-available trunk piston marine diesel lubricating oil, was also tested for comparison purposes.
  • oils had a TBN of 30; they comprised the following additives, where a tick indicates the pressence of the additive: OIL B1 B2 B3 B4 B5* B6* D Oil 1 ⁇ ⁇ Oil 2 ⁇ Reference Oil 1 ⁇ ⁇ Reference Oil 2 ⁇ ⁇ ⁇ ⁇ Reference Oil 3 ⁇ ⁇ D, when present, exceeded 1 mass % of the oil, * indicates a complex detergent.
  • Each oil contained other additive components such as described herein.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Lubricants (AREA)

Claims (6)

  1. Schmierölzusammensetzung für einen kompressionsgezündeten Viertakt-Tauchkolbenschiffsmotor mit mittlerer Drehzahl, die eine Mischung von:
    (A) Öl mit Schmierviskosität in einer größeren Menge, und
    (B) öllöslichem überbasischen Metalldetergensadditiv in einer geringeren Menge in Form eines Komplexes umfasst, wobei das basische Material des Detergens durch mehr als ein Tensid stabilisiert wird, wobei mindestens eines der Tenside ein Salicylat ist,
    die Zusammensetzung dispergiermittelfrei ist oder weniger als 0,5 Massen-%, bezogen auf die Masse der Zusammensetzung, an Dispergiermittel enthält, und die Zusammensetzung eine TBN (Gesamtbasenzahl) im Bereich von 8 bis 100 aufweist, gemessen gemäß ASTM D2896.
  2. Zusammensetzung nach Anspruch 1, bei der ein weiteres der Tenside ein Phenolat ist.
  3. Zusammensetzung nach einem der Ansprüche 1 oder 2, bei der das Metalldetergens in (B) ein Calciumdetergens ist.
  4. Zusammensetzung nach Anspruch 3, die ferner ein Brennstoff öl mit einem Restbrennstoffgehalt in einer geringeren Menge umfasst.
  5. Verwendung des Additivs (B) gemäß einem der Ansprüche 1 bis 3 in einer Schmierölzusammensetzung, die dispergiermittelfrei ist oder weniger als 0,5 Massen-% an Dispergiermittel enthält, und die eine TBN im Bereich von 8 bis 100 aufweist, um Ablagerungen unter der Krone des Kolbens zu kontrollieren, wenn die Zusammensetzung in einem kompressionsgezündeten Viertakt-Tauchkolbenschiffsmotor mit mittlerer Drehzahl verwendet wird.
  6. Verfahren zum Schmieren eines kompressionsgezündeten Viertakt-Tauchkolbenschiffsmotors mit mittlerer Drehzahl, bei dem dem Motor die Schmierölzusammensetzung gemäß einem der Ansprüche 1 bis 3 zugeführt wird.
EP01204513.4A 2000-11-27 2001-11-13 Schmierölzusammensetzungen Expired - Lifetime EP1209219B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP01204513.4A EP1209219B1 (de) 2000-11-27 2001-11-13 Schmierölzusammensetzungen

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP00204222A EP1209218A1 (de) 2000-11-27 2000-11-27 Schmierölzusammensetzungen
EP00204222 2000-11-27
EP01204513.4A EP1209219B1 (de) 2000-11-27 2001-11-13 Schmierölzusammensetzungen

Publications (2)

Publication Number Publication Date
EP1209219A1 EP1209219A1 (de) 2002-05-29
EP1209219B1 true EP1209219B1 (de) 2019-05-08

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Family Applications (1)

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EP01204513.4A Expired - Lifetime EP1209219B1 (de) 2000-11-27 2001-11-13 Schmierölzusammensetzungen

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0662508A2 (de) * 1994-01-11 1995-07-12 Bp Chemicals (Additives) Limited Schmiermittelzusammensetzungen enthaltend überbasisches Phenolat-Detergent
EP0962517A2 (de) * 1998-06-03 1999-12-08 Chevron Chemical Company Niedrigviskose hoch-überbasische Phenat-Karboxylat Zusammensetzung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9400415D0 (en) * 1994-01-11 1994-03-09 Bp Chemicals Additives Detergent compositions
GB9611318D0 (en) * 1996-05-31 1996-08-07 Exxon Chemical Patents Inc Overbased metal-containing detergents
SG55446A1 (en) * 1996-10-29 1998-12-21 Idemitsu Kosan Co Lube oil compositions for diesel engines
GB9908771D0 (en) * 1999-04-17 1999-06-09 Infineum Uk Ltd Lubricity oil composition

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0662508A2 (de) * 1994-01-11 1995-07-12 Bp Chemicals (Additives) Limited Schmiermittelzusammensetzungen enthaltend überbasisches Phenolat-Detergent
EP0962517A2 (de) * 1998-06-03 1999-12-08 Chevron Chemical Company Niedrigviskose hoch-überbasische Phenat-Karboxylat Zusammensetzung

Also Published As

Publication number Publication date
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