Lubricant base oil
A lubricant base oil having a natural origin content (ISO 16128) of 100%, may contain a monoester compound having one or more branched structures and 18 or more carbon atoms. The monoester compound may a compound of formula (1): wherein R 1 and R 2 are each independently a hydrocarbon group, at least one of R 1 and R 2 is a branched hydrocarbon group, and a total number of carbon atoms of R 1 and R 2 is 17 or more. In the compound of formula (1), R 1 may be an alkyl group or alkenyl group having 8 or more carbon atoms, R 2 may be an alkyl group or alkenyl group having 5 or more carbon atoms, and at least one of R 1 and R 2 may be a branched alkyl group or a branched alkenyl group
1 . A lubricant base oil, comprising:
a monoester compound having comprising a branched structure and carbon atoms in a range of from 24 to 26,
wherein the lubricant base oil has a natural origin content (ISO 16128) of 100%,
wherein the lubricant base oil has a kinematic viscosity at 40° C. in a range of from 7.0 to 20.0 mm 2 /s,
wherein the monoester compound is of formula (1):
wherein R 1 and R 2 are each independently a hydrocarbon group,
wherein at least one of R 1 and R 2 is a branched hydrocarbon group,
wherein a total number of carbon atoms of R 1 and R 2 is in a range of from 23 to 25.
wherein a number of carbon atoms of R 1 is 24 or less, and
wherein a number of carbon atoms of R 2 is 20 or less.
2 . The lubricant base oil of claim 1 , wherein, in the compound of formula (1).
R 1 is an alkyl group or alkenyl group having 15 or more carbon atoms,
R 2 is an alkyl group or alkenyl group having 5 or more carbon atoms, and
at least one of R1 and R2 is a branched alkyl group or a branched alkenyl group.
3 . The lubricant base oil of claim 1 , wherein R 1 and R 2 in formula (1) are each independently a branched alkyl group or a branched alkenyl group.
4 . The lubricant base oil of claim 1 , wherein a pour point of the lubricant base oil is 0° C. or less.
5 . The lubricant base oil of claim 1 , wherein a volume change rate of an acrylic rubber for test, as measured by immersing the acrylic rubber for test in the lubricant base oil under conditions at 150° C. for 72 hours in accordance with JIS K6258, is less than 20%.
6 . A lubricating oil composition, comprising:
the lubricant base oil of claim 1 .
7 . The composition of claim 6 , further comprising:
a pour point depressant;
a viscosity index improver;
an antioxidant;
an extreme pressure agent;
a metallic detergent;
an ashless dispersant;
a metal deactivator;
a friction modifier;
a rust inhibitor; and/or a defoamer.
8 . The lubricant base oil of claim 1 , wherein R 1 and R 2 in formula (1) are each independently a branched alkyl group.
9 . The lubricant base oil of claim 1 , wherein R 1 and R 2 in formula (1) are each independently a branched alkenyl group.
10 . The lubricant base oil of claim 1 , wherein the lubricant base oil has a kinematic viscosity at 40° C. in a range of from 7.04 to 11.4 mm 2 /s.
11 . The lubricant base oil of claim 1 , wherein the branched hydrocarbon group for at least one of R 1 and R 2 is independently 1-methylheptyl, 1-methyloctyl, 1,1-dimethylheptyl, 1-methyldecyl, 1-methylundecyl, 1-methyldodecyl, 1-methyltridecyl, 1-methyltetradecyl, 1-methylpentadecyl, 1-methylhexadecyl, 1-methylheptadecyl, or 1-methyloctadecyl.
12 . The lubricant base oil of claim 1 , wherein the monoester compound comprises, in esterified form, 2-octanol.
13 . The lubricant base oil of claim 1 , wherein R 1 in formula (1) is C17 branched alkyl, C15 linear alkyl, C13 linear alkyl, or C11 linear alkyl, and
wherein R 2 in formula (1) is C8 branched alkyl.
14 . The lubricant base oil of claim 1 , wherein the monoester compound comprises, in esterified form, isostearic acid, palmitic acid, myristic acid, or lauric acid.
15 . The lubricant base oil of claim 1 , wherein the monoester compound comprises methylheptyl isostearate or methylheptyl palmitate.
16 . The lubricant base oil of claim 1 , wherein a monoester compound comprises the carbon atoms in a range of from 24 to 25.
17 . The lubricant base oil of claim 1 , wherein a monoester compound comprises the carbon atoms in a range of from 25 to 26.
18 . The lubricant base oil of claim 1 , wherein a monoester compound comprises 25 of the carbon atoms.