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US 11,427,780 B2Granted
Total base number boosters for marine diesel engine lubricating compositions
AssigneeThe Lubrizol Corporation
InventorsEwan E. Delbridge, Binbin Guo, John K. Pudelski, John-Louis DiFlavio
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Abstract
A lubricating composition includes an oil of lubricating viscosity and a low-ash additive system including a low molecular weight amine with a Total Base Number of at least 150, and an N-substituted hydrocarbyl-substituted succinimide dispersant. The low-ash additive system provides the lubricating composition with a significant boost in TBN without substantially lowering the flashpoint. The composition is particularly suited to use as a marine diesel engine lubricant.
Claims21
A lubricating composition comprising:
- an oil of lubricating viscosity;
- 2-30 wt. % of an overbased metal-containing detergent having a Total Base Number, as determined by ASTM D2896-15, of 120 to 700;
- and
- no more than 40 wt. % of a low-ash additive system with a Total Base Number, as determined by ASTM D2896-15, of at least 140 mg of KOH/g consisting of:
- an amine with a Total Base Number, as determined by ASTM D2896-15, of at least 150, the amine being selected from the group consisting of N-methylmorpholine, 2-ethyl-1-hexylamine, tri-n-butylamine, N,N′-dimorpholinomethane, N-ethylmorpholine N,N,N′,N″,N″-pentamethyldiethylenetriamine, bis(1,2,2,6,6-pentamethyl-4-piperidyl) sebacate, N,N-bis(2-ethylhexyl)-1,2,4-triazol-1-ylmethanamine, and mixtures thereof, the amine being at least 10 wt. % of the lubricating composition, and
- an N-substituted, hydrocarbyl-substituted, succinimide dispersant, present at 1 to 20 wt. % of the lubricating composition, and having a Total Base Number, as determined by ASTM D2896-15, of at least 60, wherein a nitrogen of a 5-membered, heterocyclic ring of the N-substituted, hydrocarbyl-substituted, succinimide dispersant is substituted with a group other than hydrogen and wherein the heterocyclic ring is hydrocarbyl-substituted,
- the low-ash additive system providing no more than 70% of the Total Base Number of the lubricating composition, as determined by ASTM D2896-15.
4 more elements
A lubricating composition comprising:
- an oil of lubricating viscosity;
- and
- no more than 40 wt. % of a low-ash additive system with a Total Base Number, as determined by ASTM D2896-15, of at least 140 mg of KOH/g consisting of:
- an amine with a Total Base Number, as determined by ASTM D2896-15, of at least 150, wherein the amine is selected from the group consisting of bis(1,2,2,6,6-pentamethyl-4-piperidyl) sebacate, and N,N-bis(2-ethylhexyl)-1,2,4-triazol-1-ylmethanamine, and mixtures thereof, the amine being at least 10 wt. % of the lubricating composition;
- and
- an N-substituted, hydrocarbyl-substituted, succinimide dispersant, present at 1 to 20 wt. % of the lubricating composition, and having a Total Base Number, as determined by ASTM D2896-15, of at least 60, wherein a nitrogen of a 5-membered, heterocyclic ring of the N-substituted, hydrocarbyl-substituted, succinimide dispersant is substituted with a group other than hydrogen and wherein the heterocyclic ring is hydrocarbyl-substituted.
3 more elements
A method of increasing the Total Base Number of a lubricating composition which comprises adding, to the lubricating composition, a low-ash additive system consisting of:
- an amine with a Total Base Number, as determined by ASTM D2896-15, of at least 150, the amine being at least 10 wt. % of the lubricating composition, the amine having a closed cup flashpoint, as determined by ASTM D93-16, of at least 209° C., the amine being at least 10 wt. % of the lubricating composition, and
- an optionally-borated N-substituted hydrocarbyl-substituted succinimide dispersant at 1 to 20 wt. % of the lubricating composition, the N-substituted hydrocarbyl-substituted succinimide dispersant being of the form:
- where a is 0 or more,
- p indicates a chain of R5 groups, where p is at least 5 and each R5 is an alkylene group,
- q is 0 or more,
- R6 is selected from H, an alkyl group of 1-6 carbon atoms, and an amine group of the form —R9NH2, where R9 is an alkyl group of 1-6 carbon atoms, and
- R7 and R8 are independently an alkyl group of 1 to 6 carbon atoms, in an amount sufficient to increase the Total Base Number of the lubricating composition by at least 10%,
- the low-ash additive system having a Total Base Number, as determined by ASTM D2896-15, of at least 200 mg KOH/g,
- the low-ash additive system providing no more than 60% of the Total Base Number of the lubricating composition, as determined by ASTM D2896-15.
6 more elements
Dependencies are inferred from the claim text.