| 摘要 |
PURPOSE:To obtain a water-soluble lubricating oil excellent in lubricating properties, rust-preventive power, workability, etc., by using a salt of a specified alkylthiopropionic acid with an alkanolamine as the essential component. CONSTITUTION:A salt of a carboxylic acid of formula I (wherein R<1> is 6-22C alky; and R<2> is H or methyl) with an amine of formula II [wherein X<1> and X<2> are each H, 1-3C alkyl or hydroxyalkyl of the formula: (CH2),-OHz (z) is 1-3; and (y) is 0-2] is produced. The obtained salt as an essential component is mixed with optional additives such as a pH adjuster, an oiliness improver and an extreme-pressure additive to produce the objective oil. Examples of the carboxylic acids include hexylthiopropionic acid and octylthiopropionic acid. Examples of the amines include monoethanolamine and diethanolamine. |
