| 摘要 |
PROBLEM TO BE SOLVED: To provide a lubricating oil composition for a machine tool, showing excellent wear resistance.SOLUTION: A lubricating oil composition for a machine tool comprises: a lubricating-oil base oil; 0.05 to 5 mass% of a phosphoric acid ester expressed by (RO)P=O with the whole amount of the composition as reference, where Rrepresents either a 6-15C aryl group or a saturated 1-20C hydrocarbon group and a plurality of Rmay be the same or different from one another; 0.01 to 2 mass% of an acidic phosphate ester expressed by (RO)P(=O)(OH), where Rrepresents a 4-20C alkyl group, n is 1 or 2 and a plurality of Rmay be the same or different from one another; and 0.5 to 5 mass% of a sulfur compound. |
