WO2016156328A1 - Utilisation d'une composition lubrifiante comprenant un photostabilisant de type amine encombrée pour une meilleure propreté d'un piston dans un moteur à combustion interne - Google Patents

Utilisation d'une composition lubrifiante comprenant un photostabilisant de type amine encombrée pour une meilleure propreté d'un piston dans un moteur à combustion interne Download PDF

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Publication number
WO2016156328A1
WO2016156328A1 PCT/EP2016/056818 EP2016056818W WO2016156328A1 WO 2016156328 A1 WO2016156328 A1 WO 2016156328A1 EP 2016056818 W EP2016056818 W EP 2016056818W WO 2016156328 A1 WO2016156328 A1 WO 2016156328A1
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WO
WIPO (PCT)
Prior art keywords
hindered amine
bis
amine light
lubricating
lubricating composition
Prior art date
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PCT/EP2016/056818
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English (en)
Inventor
Mark Clift Southby
Sergio Leon DE ROOY
Abraham Robert De Kraker
Original Assignee
Shell Internationale Research Maatschappij B.V.
Shell Oil Company
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Application filed by Shell Internationale Research Maatschappij B.V., Shell Oil Company filed Critical Shell Internationale Research Maatschappij B.V.
Publication of WO2016156328A1 publication Critical patent/WO2016156328A1/fr

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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
    • C10M133/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen
    • C10M133/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen having a carbon chain of less than 30 atoms
    • C10M133/38—Heterocyclic nitrogen compounds
    • C10M133/40—Six-membered ring containing nitrogen and carbon only
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/17—Fisher Tropsch reaction products
    • C10M2205/173—Fisher Tropsch reaction products used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/22—Heterocyclic nitrogen compounds
    • C10M2215/221—Six-membered rings containing nitrogen and carbon only
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/08—Resistance to extreme temperature
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/10—Inhibition of oxidation, e.g. anti-oxidants
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/25—Internal-combustion engines
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/25—Internal-combustion engines
    • C10N2040/255—Gasoline engines

Definitions

  • the present invention relates to a lubricating
  • composition in particular to a lubricating composition which is suitable for lubricating internal combustion
  • Lubricants may be used in machinery to prevent
  • deposits may form in the lubricants that may hinder the movement of the
  • Lubricants may be configured to reduce the
  • Lubricants may include a mix of oils and other
  • composition of the lubricant may be any suitable lubricant.
  • the composition of the lubricant may be any suitable lubricant.
  • composition of the lubricant may be selected to control the engine' s tendency to oxidize and form
  • composition having improved piston cleanliness having improved piston cleanliness
  • Hindered amines are chemical compounds containing an amine functional group surrounded by a crowded steric environment. They have uses such as gas scrubbing, as stabilizers against light-induced polymer degradation, and as reagents for organic synthesis. Hindered amine light stabilizers are typically derivatives of 2,2,6,6- tetramethyl piperidine and are extremely efficient stabilizers against light-induced degradation of most polymers .
  • hindered amine light stabilizers can be used to provide improved piston cleanliness properties of a lubricating oil composition for the crankcase of an internal combustion engine.
  • a lubricating composition comprising (i) base oil and (ii) hindered amine light stabilizer for providing improved piston cleanliness in an internal combustion engine.
  • a method for improving the piston cleanliness properties of a lubricating oil composition used to lubricate the crankcase of an internal combustion engine comprising adding to the lubricating oil
  • composition an additive amount of one or more hindered amine light stabilizers .
  • the % improvement in piston cleanliness provided by the lubricating oil compositions herein is at least a 10% improvement in piston cleanliness, more preferably at least a 15% improvement in piston cleanliness, even more preferably at least a 19% improvement in piston cleanliness, compared to the piston cleanliness of an equivalent lubricating oil composition which does not contain a hindered amine light stabiliser.
  • the piston cleanliness properties of the lubricating oil composition are measured according to the hot tube deposits test method disclosed in WO2014036110, which reference is incorporated herein by reference in its entirety .
  • the lubricating oil composition herein comprises one or more hindered amine light stabilisers, preferably in an amount of from 0.01 wt% to 10 wt%, more preferably in an amount of from 0.25 wt% to 7 wt%, and even more preferably in an amount of from 0.1 wt% to 4 wt%, and especially in an amount of from 0.1 wt% to 2 wt%, by weight of the total lubricating oil composition.
  • the hindered amine light stabiliser is a 2, 2, 6, 6-tetraalkyl piperidine derivative which contains at least one moiety of formula (I) :
  • R 1 , R 2 , R 3 and R 4 are independently selected from Ci-Cs alkyl or R 1 and R 2 or R 3 and R 4 together are pentamethylene, and wherein R 5 is independently selected from hydrogen and Ci-C 8 alkyl.
  • Hindered amine light stabilisers are disclosed for example in US patent nos. 5004770, 5204473, 5096950, 5300544, 5112890, 5124378, 5145893, 5216156, 5844026, 5980783, 6046304, 6117995, 6271377, 6297299, 6392041, 6376584 and 6472456 and US application Ser. Nos.
  • Suitable hindered amine light stabilizers include, for example, l-cyclohexyloxy-2, 2, 6, 6-tetramethyl-4- octadecylaminopiperidine ; bis (2, 2,6,6- tetramethylpiperidin-4-yl) sebacate; bis (1-acetoxy- 2,2, 6, 6-tetramethylpiperidin-4-yl ) sebacate ;
  • the oligomeric compound which is the condensation product of 4,4' -hexamethylene-bis (amino-l-acyloxy-2 , 2, 6, 6- tetramethylpiperidine) and 2, 4-dichloro-6- [ (1-acyloxy- 2,2, 6, 6-tetramethylpiperin-4 -yl ) butylamino] -s-triazine end-capped with 2-chloro-4 , 6-bis (dibutylamino) -s- triazine; and
  • N-H sterically hindered N-H, N- methyl, N-methoxy, N-propoxy, N-octyloxy, N- cyclohexyloxy, N-acyloxy and N- (2-hydroxy-2- methylpropoxy) analogues of any of the above mentioned compounds.
  • N-H hindered amine replacing an N-H hindered amine with an N-methyl hindered amine would be employing the N- methyl analogue in place of the N-H.
  • Preferred hindered amine light stabilizers for use herein are selected from bis (l-octyloxy-2, 2, 6, 6- tetramethyl-4-piperidinyl) sebacate, bis (2, 2,6,6- tetramethyl-4-piperidinyl) sebacate, bis (1, 2,2,6, 6- pentamethyl-4 -piperidinyl ) sebacate, methyl (1,2,2,6, 6- pentamethyl-4 -piperidinyl ) sebacate, and mixtures thereof.
  • hindered amine light stabilisers suitable for use herein include those compounds available from Mayzo under the tradenames BLS 1770 and BLS 292.
  • base oil used in lubricating composition according to the present invention there are no particular limitations regarding the base oil used in lubricating composition according to the present invention, and various conventional mineral oils, synthetic oils as well as naturally derived esters such as vegetable oils may be conveniently used.
  • the base oil used in the lubricating compositions herein may conveniently comprise mixtures of one or more mineral oils and/or one or more synthetic oils; thus, according to the present invention, the term "base oil” may refer to a mixture containing more than one base oil.
  • Mineral oils include liquid petroleum oils and solvent- treated or acid-treated mineral lubricating oil of the paraffinic, naphthenic, or mixed paraffinic/naphthenic type which may be further refined by hydrofinishing processes and/or dewaxing.
  • Suitable base oils for use in the lubricating oil composition herein are Group I-III mineral base oils, Group IV poly-alpha olefins (PAOs), Group II-III Fischer- Tropsch derived base oils (preferably Group III), Group V ester base oils, and mixtures thereof.
  • API American Petroleum Institute
  • Fischer-Tropsch derived base oils are known in the art .
  • Fischer-Tropsch derived is meant that a base oil is, or is derived from, a synthesis product of a Fischer-Tropsch process.
  • a Fischer-Tropsch derived base oil may also be referred to as a GTL (Gas-To- Liquids) base oil.
  • Suitable Fischer-Tropsch derived base oils that may be conveniently used as the base oil in the lubricating composition herein are those as for example disclosed in EP0776959, EP0668342, W09721788, WO0015736, WO0014188, WO0014187, WO0014183, WO0014179, WO0008115, W09941332, EP1029029, WO0118156 and WO0157166.
  • the aromatics content of a Fischer- Tropsch derived base oil will typically be below 1 wt%, preferably below 0.5 wt% and more preferably below 0.1 wt%.
  • the base oil has a total paraffin content of at least 80 wt%, preferably at least 85, more preferably at least 90, yet more preferably at least 95 and most preferably at least 99 wt%. It suitably has a saturates content (as measured by IP-368) of greater than 98 wt%.
  • the saturates content of the base oil is greater than 99 wt%, more preferably greater than 99.5 wt%.
  • the base oil preferably also has a content of naphthenic compounds of from 0 to less than 20 wt%, more preferably of from 0.5 to 10 wt%.
  • the Fischer-Tropsch derived base oil or base oil blend has a kinematic viscosity at 100°C (as measured by ASTM D 7042) in the range of from 1 to 30 mm 2 /s (cSt), preferably from 1 to 25 mm 2 /s (cSt), and more preferably from 2 mm 2 /s to 12 mm 2 /s.
  • the Fischer-Tropsch derived base oil has a kinematic viscosity at 100°C (as measured by ASTM D 7042) of at least 2.5 mm 2 /s, more preferably at least 3.0 mm 2 /s.
  • the Fischer- Tropsch derived base oil has a kinematic viscosity at more preferably at most 4.2 mm /s (e.g. "GTL 4") .
  • the Fischer- Tropsch derived base oil has a kinematic viscosity at 100°C of at most 8.5 mm 2 /s, preferably at most 8 mm 2 /s (e.g. "GTL 8") .
  • the Fischer-Tropsch derived base oil typically has a kinematic viscosity at 40°C (as measured by ASTM D 7042) of from 10 to 100 mm 2 /s (cSt), preferably from 15 to 50 mm 2 /s.
  • the flash point (as measured by ASTM D92) of the Fischer-Tropsch derived base oil is preferably greater than 120°C, more preferably even greater than 140°C.
  • the Fischer-Tropsch derived base oil preferably has a viscosity index (according to ASTM D 2270) in the range of from 100 to 200.
  • the Fischer-Tropsch derived base oil has a viscosity index of at least 125, preferably 130. Also it is preferred that the viscosity index is below 180, preferably below 150.
  • Fischer-Tropsch derived base oil contains a blend of two or more Fischer-Tropsch derived base oils
  • the above values apply to the blend of the two or more Fischer-Tropsch derived base oils.
  • the lubricating oil composition herein preferably comprises 80 wt% or greater of Fischer-Tropsch derived base oil.
  • Synthetic oils include hydrocarbon oils such as olefin oligomers (including polyalphaolefin base oils; PAOs), dibasic acid esters, polyol esters, polyalkylene glycols (PAGs), alkyl naphthalenes and dewaxed waxy isomerates.
  • hydrocarbon oils such as olefin oligomers (including polyalphaolefin base oils; PAOs), dibasic acid esters, polyol esters, polyalkylene glycols (PAGs), alkyl naphthalenes and dewaxed waxy isomerates.
  • Synthetic hydrocarbon base oils sold by the Shell Group under the designation "Shell XHVI" (trade mark) may be conveniently used.
  • Poly-alpha olefin base oils PAOs
  • Preferred poly- alpha olefin base oils that may be used in the
  • lubricating compositions of the present invention may be derived from linear C 2 to C 32 , preferably C 6 to Ci 6 , alpha olefins.
  • Particularly preferred feedstocks for said poly-alpha olefins are 1-octene, 1-decene, 1-dodecene and 1-tetradecene .
  • the base oil contains more than 50 wt%, preferably more than 60 wt%, more preferably more than 70 wt%, even more preferably more than 80 wt . % . most preferably more than 90 wt% Fischer-Tropsch derived base oil.
  • not more than 5 wt%, preferably not more than 2 wt%, of the base oil is not a Fischer-Tropsch derived base oil. It is even more preferred that 100 wt% of the base oil is based on one or more Fischer-Tropsch derived base oils.
  • the total amount of base oil incorporated in the lubricating composition herein is preferably in the range of from 60 to 99 wt%, more preferably in the range of from 65 to 90 wt% and most preferably in the range of from 70 to 85 wt%, with respect to the total weight of the lubricating composition.
  • the base oil (or base oil blend) as used in the lubricating composition herein has a kinematic viscosity at 100°C (according to ASTM D445) of above 2.5 cSt and below 5.6 cSt .
  • the base oil has a kinematic viscosity at 100°C (according to ASTM D445) of between 3.5 and 4.5 cSt .
  • the base oil contains a blend of two or more base oils, it is
  • the blend has a kinematic viscosity at 100°C of between 3.5 and 4.5 cSt .
  • the lubricating compositions herein would be utilised in, but not necessarily limited to, SAE J300 viscosity grades OW-20, OW-30, OW-40, 5W-20, 5W-30 and 5W-40 as these are the grades which target fuel economy.
  • SAE J300 viscosity grades are published, with lower viscosities than the current OW-20, the present invention would also be very much applicable to these new viscosity lower grades. It is conceivable that the present invention could also be used with higher
  • the lubricating composition herein preferably has a Noack volatility (according to ASTM D 5800) of below 15 wt%.
  • the Noack volatility (according to ASTM D 5800) of the composition is between 1 and 15 wt%, preferably below 14.6 wt% and more preferably below 14.0 wt% .
  • the lubricating oil composition has a kinematic viscosity in the range of from 2 to 80 mm 2 /s at 100 °C, more preferably of from 3 to 70 mm 2 /s, most preferably of from 4 to 50 mm 2 /s.
  • the total amount of phosphorus in the lubricating oil composition herein is preferably less than or equal to 0.08 wt%, by weight of the lubricating composition.
  • the lubricating oil composition herein preferably has a sulphated ash content of not greater than 2.0 wt%, more preferably not greater than 1.0 wt% and most preferably not greater than 0.8 wt%, based on the total weight of the lubricating oil composition.
  • the lubricating oil composition herein preferably has a sulphur content of not greater than 1.2 wt%, more preferably not greater than 0.8 wt% and most preferably not greater than 0.2 wt%, based on the total weight of the lubricating oil composition.
  • the lubricating composition herein further comprises one or more additives such as anti-oxidants, anti-wear additives, dispersants, detergents, overbased detergents, extreme pressure additives, friction modifiers, viscosity index improvers, pour point depressants, metal
  • passivators corrosion inhibitors, demulsifiers , anti-foam agents, seal compatibility agents and additive diluent base oils, etc.
  • Antioxidants that may be conveniently used include those selected from the group of aminic antioxidants and/or phenolic antioxidants.
  • said antioxidants are present in an amount in the range of from 0.1 to 5.0 wt%, more preferably in an amount in the range of from 0.3 to 3.0 wt%, and most preferably in an amount in the range of from 0.5 to 1.5 wt%, based on the total weight of the lubricating oil composition.
  • alkylated diphenylamines phenyl-a-naphthylamines, phenyl--naphthylamines and alkylated a-naphthylamines .
  • Preferred aminic antioxidants include dialkyldiphenylamines such as p, p ' -dioctyl-diphenylamine, p, p ' -di-a-methylbenzyl-diphenylamine and N-p-butylphenyl- N-p ' -octylphenylamine, monoalkyldiphenylamines such as mono-t-butyldiphenylamine and mono-octyldiphenylamine, bis (dialkylphenyl) amines such as di-(2,4- diethylphenyl) amine and di (2-ethyl-4-nonylphenyl) amine, alkylphenyl-l-naphthylamines such as octylphenyl-1- naphthylamine and n-t-dodecylphenyl-l-naphthylamine, 1- naphthyl
  • phenylenediamines such as N, ' -diisopropyl-p- phenylenediamine and N, ' -diphenyl-p-phenylenediamine, and phenothiazines such as phenothiazine and 3,7- dioctylphenothiazine .
  • Preferred aminic antioxidants include those available under the following trade designations: “Sonoflex OD-3” (ex. Seiko Kagaku Co.), “Irganox L-57” (ex. Ciba).
  • phenolic antioxidants which may be conveniently used include C 7 -C 9 branched alkyl esters of 3, 5-bis (1, 1-dimethyl-ethyl ) -4-hydroxy-benzenepropanoic acid, 2-t-butylphenol, 2-t-butyl-4-methylphenol, 2-t- butyl-5-methylphenol, 2, 4-di-t-butylphenol, 2, 4-dimethyl-
  • 6-t-butylphenol 2-t-butyl-4-methoxyphenol, 3-t-butyl-4- methoxyphenol, 2, 5-di-t-butylhydroquinone, 2, 6-di-t-butyl- 4-alkylphenols such as 2, 6-di-t-butylphenol, 2,6-di-t- butyl-4-methylphenol and 2, 6-di-t-butyl-4-ethylphenol, 2, 6-di-t-butyl-4-alkoxyphenols such as 2, 6-di-t-butyl-4- methoxyphenol and 2, 6-di-t-butyl-4-ethoxyphenol, 3,5-di-t- butyl-4-hydroxybenzylmercaptooctylacetate, alkyl-3- (3, 5- di-t-butyl-4-hydroxyphenyl) propionates such as n- octadecyl-3- (3, 5-di-t-butyl-4-hydroxyphenyl) prop
  • 2, 6-d-t-butyl-OC-dimethylamino-p-cresol 2,2' -methylene- bis (4-alkyl-6-t-butylphenol) such as 2, 2 ' -methylenebis (4- methyl-6-t-butylphenol, and 2, 2-methylenebis (4-ethyl-6-t- butylphenol) , bisphenols such as 4 , 4 ' -butylidenebis ( 3- methyl-6-t-butylphenol, 4,4' -methylenebis (2, 6-di-t- butylphenol) , 4 , 4 ' -bis (2 , 6-di-t-butylphenol ) , 2,2-(di-p- hydroxyphenyl) propane, 2, 2-bis (3, 5-di-t-butyl-4- hydroxyphenyl) propane, 4,4' -cyclohexylidenebis (2, 6-t- butylphenol) , hexamethyleneglycol-bis [3- (3
  • Preferred phenolic antioxidants include those available under the following trade designations:
  • the lubricating oil composition herein may comprise mixtures of one or more phenolic antioxidants with one or more aminic antioxidants.
  • Anti-wear additives that may be conveniently used include zinc-containing compounds such as zinc
  • dithiophosphate compounds selected from zinc dialkyl-, diaryl- and/or alkylaryl- dithiophosphates , molybdenum- containing compounds, boron-containing compounds and ashless anti-wear additives such as substituted or unsubstituted thiophosphoric acids, and salts thereof.
  • the lubricating oil composition may comprise a single zinc dithiophosphate or a combination of two or more zinc dithiophosphates as anti-wear additives, the or each zinc dithiophosphate being selected from zinc dialkyl-, diaryl- or alkylaryl- dithiophosphates .
  • Zinc dithiophosphate is a well known additive in the art and may be conveniently represented by general formula II;
  • R z to R may be the same or different and are each a primary alkyl group containing from 1 to 20 carbon atoms preferably from 3 to 12 carbon atoms, a secondary alkyl group containing from 3 to 20 carbon atoms, preferably from 3 to 12 carbon atoms, an aryl group or an aryl group substituted with an alkyl group, said alkyl substituent containing from 1 to 20 carbon atoms
  • Zinc dithiophosphate compounds in which to are all different from each other can be used alone or in admixture with zinc dithiophosphate compounds in which R 2 to R 5 are all the same.
  • the or each zinc dithiophosphate used in the present invention is a zinc dialkyl dithiophosphate.
  • Examples of suitable zinc dithiophosphates which are commercially available include those available ex.
  • the lubricating oil composition herein may generally comprise in the range of from 0.4 to 1.2 wt% of zinc dithiophosphate, based on total weight of the lubricating oil composition.
  • molybdenum-containing compounds may conveniently include molybdenum dithiocarbamates , trinuclear molybdenum compounds, for example as described in WO 98/26030, sulphides of molybdenum and molybdenum dithiophosphate .
  • Boron-containing compounds that may be conveniently used include borate esters, borated fatty amines, borated epoxides, alkali metal (or mixed alkali metal or alkaline earth metal) borates and borated overbased metal salts.
  • lubricating composition herein include one or more salicylate and/or phenate and/or sulphonate detergents.
  • metal organic and inorganic base salts which are used as detergents can contribute to the sulphated ash content of a lubricating oil composition, in a preferred embodiment of the present invention, the amounts of such additives are minimised.
  • salicylate detergents are preferred.
  • detergents are preferably used in amounts in the range of
  • said detergents independently, have a TBN (total base number) value in the range of from 10 to 500 mg.KOH/g, more preferably in the range of from 30 to 350 mg.KOH/g and most preferably in the range of from 50 to 300 mg.KOH/g, as measured by ISO 3771.
  • TBN total base number
  • the lubricating oil compositions herein may
  • an ash-free dispersant which is preferably admixed in an amount in the range of from 5 to 15 wt%, based on the total weight of the lubricating oil composition .
  • ash-free dispersants examples include the polyalkenyl succinimides and polyalkenyl succininic acid esters disclosed in Japanese Patent Nos . 1367796, 1667140, 1302811 and 1743435.
  • Preferred dispersants include borated succinimides.
  • viscosity index improvers which may conveniently be used in the lubricating composition herein include the styrene-butadiene stellate copolymers, styrene-isoprene stellate copolymers and the
  • Dispersant- viscosity index improvers may be used in the lubricating composition herein.
  • the composition herein contains less than 1.0 wt%, preferably less than 0.5 wt%, of a Viscosity Index improver concentrate (i.e. VI improver plus "carrier oil” or "diluent"), based on the total weight of the composition.
  • a Viscosity Index improver concentrate i.e. VI improver plus "carrier oil” or "diluent
  • the composition is free of Viscosity Index improver concentrate.
  • Viscosity Modifier as used hereafter is meant to be the same as the above-mentioned term "Viscosity Index improver concentrate”.
  • the composition contains at least 0.1 wt% of a pour point depressant.
  • a pour point depressant alkylated naphthalene and phenolic polymers, polymethacrylates, maleate/ fumarate copolymer esters may be conveniently used as effective pour point depressants.
  • compounds such as alkenyl succinic acid or ester moieties thereof, benzotriazole-based compounds and thiodiazole-based compounds may be conveniently used in the lubricating composition herein as corrosion inhibitors .
  • polycyclohexane and polyacrylates may be conveniently used in the lubricating composition herein as defoaming agents.
  • seal fix or seal compatibility agents include, for example, commercially available aromatic esters.
  • the above-mentioned additives are typically present in an amount in the range of from 0.01 to 35.0 wt%, based on the total weight of the lubricating composition, preferably in an amount in the range of from 0.05 to 25.0 wt%, more preferably from 1.0 to 20.0 wt%, based on the total weight of the lubricating composition.
  • the composition contains at least 9.0 wt%, preferably at least 10.0 wt%, more preferably at least 11.0 wt% of an additive package comprising an anti- wear additive, a metal detergent, an ashless dispersant and an anti-oxidant .
  • the lubricating compositions herein are preferably engines oils for use in the crankcase of an engine.
  • the engine oil may include a heavy duty diesel engine oil, a passenger car motor engine oil, as well as other types of engine oils, such as motor cycle oils and marine engine oils .
  • PCMO Passenger Car Motor Oil
  • a sulphated ash content (according to ASTM D 874) of up to 0.5 wt%, up to 0.8 wt% and up to 1.5 wt%,
  • a phosphorus content (according to ASTM D 5185) of up to 0.05 wt%, up to 0.08 wt% and typically up to 0.1 wt%, respectively;
  • a sulphur content (according to ASTM D 5185) of up to 0.2 wt%, up to 0.3 wt% and typically up to 0.5 wt%, respectively.
  • a sulphated ash content (according to ASTM D 874) of up to 1 wt%, up to 1 wt% and up to 2 wt%, respectively; a phosphorus content (according to ASTM D 5185) of up to 0.08 wt% (low SAPS) and up to 0.12 wt% (mid SAPS), respectively; and
  • a sulphur content (according to ASTM D 5185) of up to 0.3 wt% (low SAPS) and up to 0.4 wt% (mid SAPS), respectively.
  • the lubricating compositions herein may be any suitable lubricating compositions herein.
  • hindered amine light stabiliser provides reduced piston cleanliness, in particular as measured according to hot tube deposits test method as described in WO2014036110.
  • a cleanliness merit of 10.0 represents completely clean engine pistons.
  • lubricating compositions described herein comprising a base oil and a hindered amine light stabiliser preferably provide a hot tube cleanliness merit result in the hot tube deposits test method described in WO2014036110 of 8.0 or above .
  • Lubricating formulations were prepared by top treating a reference lubricant (reference lubricant A which was a passenger car motor oil (PCMO) meeting GF-5 specification) with 3wt% of a hindered amine light stabilizer compound or a conventional antioxidant
  • reference lubricant A which was a passenger car motor oil (PCMO) meeting GF-5 specification
  • Comparative Example 1 consisted of reference lubricant A top treated with 3wt% of a conventional aminic antioxidant. Comparative Example 2 consisted of reference lubricant A top treated with 3wt% of a conventional phenolic antioxidant. Example 1 consisted of the
  • reference lubricant A top treated with 3wt% of decanedioic acid, 1, 10-bis (2, 2, 6, 6-tetramethyl-4-piperidinyl) ester (commercially available from Mayzo under the tradename BLS
  • Example 2 consisted of reference lubricant A top treated with 3 wt% of decanedioic acid, 1, 10-bis

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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)

Abstract

L'invention concerne l'utilisation d'une composition lubrifiante comprenant (i) une huile de base et (ii) un photostabilisant de type amine encombrée permettant de fournir une meilleure propreté de piston. De préférence, le photostabilisant de type amine encombrée est un dérivé de 2,2,6,6-tétraalkylpipéridine qui contient au moins une fraction de formule (I) : dans laquelle R1, R2, R3 et R4 sont indépendamment choisis parmi un alkyle en C1-C8 ou R1 et R2 ou R3 et R4sont ensemble un pentaméthylène, et dans laquelle R5 est indépendamment choisi parmi un hydrogène et un alkyle en C1-C8.
PCT/EP2016/056818 2015-03-31 2016-03-29 Utilisation d'une composition lubrifiante comprenant un photostabilisant de type amine encombrée pour une meilleure propreté d'un piston dans un moteur à combustion interne WO2016156328A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109652165A (zh) * 2017-10-11 2019-04-19 中国石油化工股份有限公司 一种润滑油基础油光稳定剂组合物及其制备方法与应用

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WO2000014179A1 (fr) 1998-09-04 2000-03-16 Exxon Research And Engineering Company Base de lubrifiant synthetique de premiere qualite
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WO2000015736A2 (fr) 1998-09-11 2000-03-23 Exxon Research And Engineering Company Huiles lubrifiantes isoparaffiniques synthetiques a large fraction de distillation
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109652165A (zh) * 2017-10-11 2019-04-19 中国石油化工股份有限公司 一种润滑油基础油光稳定剂组合物及其制备方法与应用
CN109652165B (zh) * 2017-10-11 2021-09-14 中国石油化工股份有限公司 一种润滑油基础油光稳定剂组合物及其制备方法与应用

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