Method for producing lubricating oil composition, and lubricating oil composition
This method for producing a lubricating oil composition includes: a step of dissolving fullerenes in a base oil mainly composed of a multiply alkylated cyclopentane oil or an ionic liquid containing an imide as a negative ion to obtain a fullerene solution; and a step of producing fullerenes adduct by subjecting the above-described fullerene solution to a heat treatment in a non-oxidizing atmosphere.
1. A method for producing a lubricating oil composition, comprising:
a step of dissolving fullerenes in a base oil mainly composed of a multiply alkylated cyclopentane oil or an ionic liquid containing an imide as a negative ion configured to obtain a fullerene solution; and
a step of producing fullerene adducts by subjecting the fullerene solution to a heat treatment in a non-oxidizing atmosphere.
2. The method for producing a lubricating oil composition according to claim 1 ,
wherein an oxygen gas partial pressure in the non-oxidizing atmosphere is less than or equal to 10 pascals.
3. The method for producing a lubricating oil composition according to claim 1 ,
wherein a temperature of the heat treatment is 80° C. to 300° C.
4. The method for producing a lubricating oil composition according to claim 1 ,
wherein the heat treatment is performed until a concentration of fullerenes in the fullerene solution is 0.1 to 0.7 with respect to a concentration of fullerenes before the heat treatment.
5. The method for producing a lubricating oil composition according to claim 1 ,
wherein the fullerene dissolved in the base oil is C 60 or C 70 or a mixture thereof.
6. The method for producing a lubricating oil composition according to claim 1 ,
wherein a temperature of the heat treatment in the step of producing fullerene adducts is higher than or equal to an upper limit usage temperature of the base oil, and the difference between the temperature of the heat treatment and the upper limit usage temperature is within 200° C.
7. The method for producing a lubricating oil composition according to claim 1 , the method further comprising:
a step of removing an insoluble component using a membrane filter or a centrifugal separator after performing the step of obtaining the fullerene solution.
8. The method for producing a lubricating oil composition according to claim 1 ,
wherein a heat treatment time in the step of producing fullerene adducts is 5 minutes to 24 hours.
9. The method for producing a lubricating oil composition according to claim 1 ,
wherein the concentration of the fullerene in the fullerene solution is 1 mass ppm to 1,000 mass ppm.
10. The method for producing a lubricating oil composition according to claim 1 , the method further comprising:
an adjustment step of reducing a concentration of oxygen molecules before the step of producing fullerene adducts,
wherein the adjustment step and the step of producing fullerene adducts are continuously performed, and
wherein, in the adjustment step, the fullerene solution is placed into an airtight metal container and the inside of the metal container is substituted with an inert gas.
11. The method for producing a lubricating oil composition according to claim 1 , the method further comprising:
an adjustment step of reducing a concentration of oxygen molecules before the step of producing fullerene adducts,
wherein the adjustment step and the step of producing fullerene adducts are continuously performed, and
wherein, in the adjustment step, the fullerene solution is placed into an airtight container and the inside of the container is decompressed.
12. A lubricating oil composition comprising:
a base oil mainly composed of a multiply alkylated cyclopentane oil or an ionic liquid containing an imide as a negative ion; and
fullerene adducts obtained by adding a component derived from the base oil to fullerenes.