Lubricant additive, lubricant additive composition, and lubricating oil composition containing the same
A lubricant additive capable of imparting various functions to a lubricant base oil contains an ester compound (A) represented by formula (1) and an ester compound (B) represented by formula (2). (A):(B) being a mass ratio of the ester compound (A) to the ester compound (B) is 99:1 to 80:20.
1. A lubricant additive, comprising:
an ester compound (A) represented by formula (1),
wherein R 1 represents an alkylene group or an alkenylene group having 2 carbon atoms, R 2 represents an alkyl group or an alkenyl group having 4 to 22 carbon atoms, and M represents a hydrogen atom or tertiary ammonium cations in which a saturated or unsaturated hydrocarbon group having 1 to 24 carbon atoms is bonded to a nitrogen atom; and
an ester compound (B) represented by formula (2),
wherein R 3 represents an alkylene group or an alkenylene group having 2 carbon atoms, and R 4 and R 5 each independently represent an alkyl group or an alkenyl group having 4 to 22 carbon atoms, wherein
(A):(B) being a mass ratio of the ester compound (A) and the ester compound (B) is 99:1 to 80:20.
2. A lubricant additive composition, comprising:
the lubricant additive according to claim 1 ; and
zinc dithiophosphate (C) represented by formula (3),
wherein R 6 to R 9 each independently represent a hydrocarbon group having 1 to 24 carbon atoms, wherein
a content of the zinc dithiophosphate (C) is 1 to 1000 parts by mass with respect to a total content of the ester compound (A) and the ester compound (B) being 100 parts by mass.
3. A lubricating oil composition, comprising:
70 to 99.99 mass% of a lubricant base oil; and
0.01 to 30 mass% of the lubricant additive according to claim 1 .
4. A lubricating oil composition, comprising:
70 to 99.99 mass% of a lubricant base oil; and
0.01 to 30 mass% of the lubricant additive composition according to claim 2 .