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US 12,291,688 B1Granted
Silicon-containing compounds for lubricants
AssigneeAfton Chemical Corporation
InventorsSheng Jiang, Ashutosh Gupta, Kun Liu
Life of this patent
Estimating the term…
Abstract
The present disclosure relates to lubricating compositions and methods of lubricating a spark-ignition engine effective to depress low-speed pre-ignition (LSPI) events and to maintain low foaming and/or aeration through selected silicon chemistries and treat rates.
Claims13
A passenger car motor oil configured to maintain low foam and/or low aeration during lubrication, the passenger car motor oil comprising:
- one or more base oils of lubricating viscosity;
- about 15 ppm or less of silicon provided from a polydialkylsiloxane antifoam polymer;
- and
- at least about 100 ppm of additional silicon provided from a silicon-containing compound selected from a siloxane derivative, wherein the silicon-containing compound providing the additional silicon has a molecular weight of no more than about 650;
- and
- wherein the additional silicon is provided by a compound of Formula II
- wherein
- each R is a methyl group;
- R1 is a —R2—[O—R3]n—OR4 polyether group with R2 being a C3 hydrocarbyl group, R3 being a C1 to C2 hydrocarbyl group, R4 being either hydrogen or a methyl group;
- m being an integer of 0 when R4 is hydrogen and m being an integer of 1 when R4 is a methyl group, and
- n being an integer of 1.
8 more elements
A method of lubricating a combustion engine with a passenger car motor oil to provide low foaming and/or low aeration with increased levels of silicon, the method comprising:
- lubricating the combustion engine with the passenger car motor oil, wherein the passenger car motor oil includes (i) one or more base oils of lubricating viscosity;
- (ii) about 15 ppm or less of silicon provided from a polydialkylsiloxane antifoam polymer;
- and (iii) at least about 100 ppm of additional silicon provided from a silicon-containing compound selected from a siloxane derivative, wherein the silicon-containing compounding providing the additional silicon has a molecular weight of no more than about 650;
- and wherein the additional silicon is provided by a compound of Formula II
- wherein each R is a methyl group:
- R1 is a —R2—[O—R3]n—OR4 polyether group with R2 being a C3 hydrocarbyl group, R3 being a C1 to C2 hydrocarbyl group, R4 being either hydrogen or a methyl group:
- m being an integer of 0 when R4 is hydrogen and m being an integer of 1 when R4 is a methyl group, and n being an integer of 1;
- and
- wherein the passenger car motor oil entrains a lower volume of free air when operated in a naturally aspirated engine as compared to a reference motor oil without the additional silicon provided from a silicon-containing compound.
6 more elements
Dependencies are inferred from the claim text.