High performance non-zinc, zero phosphorus engine oils for internal combustion engines

a technology of engine oil and non-zinc, applied in the direction of lubricant composition, liquid carbonaceous fuel, additives, etc., can solve the problem of harmful catalysts used by volatile sulfur

Inactive Publication Date: 2005-02-24
FARNG L OSCAR +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012] Another aspect of the present invention is directed toward a low sulfur containing lubricant composition which is substantially zinc and phosphorous free that is particular suitable for use in engines combusting low sulfur fuels, the composition comprising a major amount of a low sulfur base oil, preferably below about 300 ppm sulfur and an additive system comprising a combination of a metal detergent or mixture of metal detergents, at least a borated ashless dispersant, an ashless antioxidant or mixture of antioxidants containing at least an aminic antioxidant, and an oil soluble, phosphorous free, trinuclear molybdenum compound, the composition having a B:Mo:N ratio in the range of about 3:5:7 to about 5:1:18.
[0013] The lubricants of the invention are especially useful with fuels containing below about 350 ppm sulfur.

Problems solved by technology

Unfortunately phosphorous tends to deactivate the catalysts typically employed for control of hydrocarbon emissions from the engine.
Volatile sulfur is harmful to the catalysts used to control NOx emissions; and, zinc contributes to plugging engine exhaust particulate filters.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0028] A series of engine lubricants were formulated having the compositions set forth in Table 1. Oil 1 included for comparative purposes had a sulfur content of 3080 ppm and a phosphorous content of 960 ppm. Oils 2 and 3 were substantially zinc and phosphorous free and had sulfur levels of 1161 and 1483 ppm respectively.

TABLE 1Oil 1Oil 2Oil 3SyntheticsSyntheticsSyntheticsComponentViscosity GradeFormulationChemistry0W-400W-305W-30Mixed AshlessBorated & non-888Dispersantsborated PIBsuccinimide / esterMixedCa / Mg sulfonate / 3.354.34.3Detergentsphenate / salicylateZDDPZinc1.000dithiophosphatesMixedPhenolic &1.01.51.5AntioxidantsAminicantioxidantsMixed FrictionMoly Trimer &0.460.350.35Modifiersashless frictionmodifiersMixedSilicone & non-3.022.02.0Defoamants / sealsiliconeswell agent / VIimproversBase OilGroup IV / VBal.Bal.Bal.Ash (D874)Wt %0.960.991.05ZnPpm1000MoPpm0180170BPpm180540545NPpm (calculated)104914941494PPpm960S (D2622-1)Ppm308011611483

[0029] These oils were then subjected to the eng...

example 2

[0033] A series of zinc and phosphorus free engine lubricants were formulated having the compositions set forth in Table 3. Oil 1 had a boron content of 93 ppm and molybdenum content of 190 ppm whereas oils 2 had a boron content of 540 ppm and molybdenum content of 180 ppm. Oil 3 was free of molybdenum, but had a similar boron content to oil 2 (550 ppm). These oils were then subjected to the same engine performance tests (Sequence IVA) set forth in Example 1 and the results of these tests are provided in Table 3.

[0034] The Sequence IVA test results indicated that oil 2 meets wear requirements (<120 micron) while oil 1 could not. Oil 3 also failed the engine test as molybdenum friction modifiers were removed from the formulation. Clearly, the boron-molybdenum synergism is needed in order to achieve a satisfactory engine performance. Either the high boron alone or a combination of low boron and high molybdenum is not sufficient to meet the engine requirements.

TABLE 3Oil 1Oil 2Oil 3...

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Abstract

A substantially zinc and phosphorous free lubricating oil meeting engine performance requirements contain an additive system containing metal detergents, at least one borated ashless dispersant, at least an amine antioxidant and a trinuclear molybdenum compound. The lubricant contains a minimum of 120 ppm boron and a minimum of 80 ppm molybdenum.

Description

[0001] This application claims the benefit of U.S. Ser. No. 60 / 497,234 filed Aug. 22, 2003. FIELD OF INVENTION [0002] The present invention is concerned broadly with lubricating compositions and more specifically with lubricating compositions for internal combustion engines that are substantially free of phosphorous and zinc. BACKGROUND OF INVENTION [0003] Contemporary engine oil technology uses zinc dithiophosphates (ZDTP) or more specifically zinc dialkyldithiophosphate (ZDDP) for corrosion, oxidation and wear protection and metallic detergents for engine cleanliness. These additives are rich in sulfur, phosphorous and ash content, and play a critical role in meeting severe engine performance requirements. Unfortunately phosphorous tends to deactivate the catalysts typically employed for control of hydrocarbon emissions from the engine. Volatile sulfur is harmful to the catalysts used to control NOx emissions; and, zinc contributes to plugging engine exhaust particulate filters. A...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10M161/00C10M169/04
CPCC10M161/00C10N2260/14C10M169/044C10M2207/021C10M2207/024C10M2207/027C10M2207/124C10M2215/062C10M2215/064C10M2215/065C10M2215/28C10M2219/044C10M2219/066C10M2219/08C10M2219/087C10M2219/108C10M2223/045C10M2227/09C10M2229/02C10N2210/02C10N2210/06C10N2230/06C10N2230/40C10N2230/42C10N2230/43C10N2240/10C10M163/00C10N2010/12C10N2030/40C10N2030/43C10N2030/42C10N2030/06C10N2010/04C10N2040/25C10N2060/14C10M169/04C10M169/00
Inventor FARNG, L. OSCARJACKSON, ANDREWGIVENS, WILLIE A. JR.DECKMAN, DOUGLAS E.BUCK, WILLIAM H.
Owner FARNG L OSCAR
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