LUBRICANT COMPOSITION FOR INTERNAL COMBUSTION ENGINE OIL

摘要

The lubricating oil composition for internal combustion engines of the present invention contains a base oil, a thioheterocyclic compound represented by the following formula (I);(R1)k—(S)mAS-(S)n—(R2)l   (I);(wherein As represents a thioheterocycle; each of R1 and R2 represents a hydrogen atom, an amino group, a C1 to C50 hydrocarbyl group selected from among an alkyl group, a cycloalkyl group, an alkenyl group, a cycloalkenyl group, and an aryl group, or, in the case of a hydrocarbyl group, a C1 to C50 heteroatom-containing group having an atom selected from among an oxygen atom, a nitrogen atom, and a sulfur atom, in the hydrocarbyl group; and each of k, l, m, and n is an integer of 0 to 5), and an aminoalcohol compound having, in the molecule thereof, one or more amino groups and one or more hydroxyl groups, wherein the composition has a phosphorus content (P mass %) and a sulfated ash content (M mass %), based on the total amount of the composition, satisfying any of the following conditions A to C: condition A: P<0.03, and M<0.3; condition B: P<0.03, and 0.3≦M≦0.6; and condition C: 0.03≦P≦0.06, and M<0.3. The lubricating oil composition of the present invention can considerably reduce the amounts of phosphorus-containing additives and a metallic detergent, while high-temperature detergency and wear resistance are maintained.

主权项

1. A lubricating oil composition for internal combustion engines comprising a base oil, a thioheterocyclic compound represented by the following formula (I):
(R1)k—(S)m-AS—(S)n—(R2)l   (I) (wherein As represents a thioheterocycle; each of R1 and R2 represents a hydrogen atom, an amino group, a C1 to C50 hydrocarbyl group selected from among an alkyl group, a cycloalkyl group, an alkenyl group, a cycloalkenyl group, and an aryl group, or, in the case of a hydrocarbyl group, a C1 to C50 heteroatom-containing group having an atom selected from among an oxygen atom, a nitrogen atom, and a sulfur atom, in the hydrocarbyl group; and each of k, l, m, and n is an integer of 0 to 5), and an aminoalcohol compound having, in the molecule thereof, one or more amino groups and one or more hydroxyl groups, wherein the composition has a phosphorus content (P mass %) and a sulfated ash content (M mass %), based on the total amount of the composition, satisfying any of the following conditions A to C:
condition A: P<0.03, and M<0.3;condition B: P<0.03, and 0.3≦M≦0.6; andcondition C: 0.03≦P≦0.06, and M<0.3.