Lubricating base oil and lubricating oil composition
View Patent ↗The invention provides a lubricating base oil with a saturated component content of 90% by mass or greater, a proportion of cyclic saturated components of no greater than 40% by mass of the saturated components, a viscosity index of 110 or greater, an aniline point of 106 or greater and an ε-methylene proportion of 14-20% of the total constituent carbons, as well as a lubricating oil composition comprising the lubricating base oil.
1. A lubricating base oil having:
a saturated component content of 95% by mass or greater,
a cyclic saturated component proportion which is measured based on ASTM D 2786-91 of no greater than 40% by mass of the saturated component,
a viscosity index of 110 to 160,
a kinematic viscosity at 100° C. of 3.7 to 4.5 mm 2 /s,
a kinematic viscosity at 40° C. of 13 to 19 mm 2 /s,
a solid point of −45 to −20° C.,
an iodine number of no greater than 2.5,
a NOACK evaporation of 6 to 20% by mass,
a ratio (M A /M B ) between the mass of monocyclic saturated components (M A ) and the mass of bicyclic or greater saturated components (M B ) of the cyclic saturated components of no greater than 3,
an aniline point of 106 or greater,
a tertiary carbon proportion of 6 to 12% of the total constituent carbons,
an ε-methylene proportion of 14 to 20% of the total constituent carbons, and
an aromatic content of 0.4% by mass or greater.
2. The lubricating base oil according to claim 1 , wherein bicyclic or greater polycyclic saturated components constitute no greater than 20% by mass of the saturated components.
3. The lubricating base oil according to claim 1 , wherein an aromatic content is no greater than 5% by mass.
4. A lubricating oil composition comprising the lubricating base oil according to claim 1 .
5. The lubricating base oil according to claim 1 , wherein a −35° C. CCS viscosity of the base oil is less than 2800 mPa·s.
6. The lubricating base oil according to claim 1 , wherein a −35° C. CCS viscosity of the base oil is less than 2000 mPa·s.
7. The lubricating base oil according to claim 1 , wherein the base oil is obtained by hydrocracking and/or hydroisomerization of a stock oil comprising at least 50 vol % slack wax.
8. The lubricating base oil according to claim 1 , wherein the base oil is obtained by hydrocracking and/or hydroisomerization of a stock oil comprising at least 50 vol % synthetic wax obtained by gas-to-liquid process.
9. The lubricating oil composition according to claim 4 , wherein a −40° C. MRV viscosity is no greater than 30,000 mPa·s.
10. The lubricating oil composition according to claim 4 , wherein a kinematic viscosity at 100° C. is 4.5 to 21.9 mm 2 /s.
11. The lubricating oil composition according to claim 4 , wherein a viscosity index is 160 or greater.
12. The lubricating base oil according to claim 1 , wherein the ratio (M A /M B ) is no greater than 2.
13. The lubricating base oil according to claim 12 , wherein the ratio (M A /M B ) is no greater than 1.
14. The lubricating base oil according to claim 1 , wherein the aromatic content is 0.5% by mass or greater.