Aluminum processing oil base oil and lubricating oil composition for aluminum processing

摘要

PROBLEM TO BE SOLVED: To provide an aluminum processing oil base oil and a lubricating oil composition for aluminum processing capable of further suppressing the generation of stains in aluminum processing. The difference between the 5% distillation temperature obtained by the normal pressure method of JIS K 2254 and the initial distillation point (5% distillation temperature-initial distillation point) is 13 ° C. or less, and JIS K 2254. The difference between the end point obtained by the normal pressure method and the 95% distillation temperature (end point-95% distillation temperature) is 15 ° C. or less, and the surface tension at 25 ° C. obtained by the method of JIS K 2241 is 28 mN. An aluminum processing oil base oil having a kinematic viscosity of 1.5 mm2 / s or more and 7.0 mm2 / s or less at 40 ° C. of / m or less. [Selection diagram] None