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US 8,058,217 B2Granted
Metal working fluid
AssigneeNippon Oil Co., Ltd.
InventorsSatoshi Suda, Hideo Yokota, Masanori Ibi
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Abstract
The oil for metal working according to the invention is an oil for metal working comprising a triester of fatty acids and glycerin, wherein the content of oleic acid in the fatty acids is 40-98% by mass based on the total amount of the fatty acids. The oil for metal working of the invention can achieve a high level of machining performance without using a chlorine-based extreme pressure agent.
Claims8
An oil for metal working, comprising
- a triester of fatty acids and glycerin of no less than 45.75% by mass based on a total amount of the oil,
- wherein the content of oleic acid in the fatty acids is 64-80% by mass and the content of linoleic acid in the fatty acids is 8-20% by mass, based on the total amount of the fatty acids;
- and
- wherein the triester has a kinematic viscosity at 40° C. of 5-75 mm2/s, a total degree of unsaturation of 0.16-0.26, and a viscosity index of 202-206;
- a phosphoric acid ester of 2.0-5.0% by mass based on the total amount of the oil;
- a sulfidizied ester of 3.0-10.0% by mass based on the total amount of the oil;
- and
- optionally an antioxidant and/or a sulfonate.
5 more elements
Dependencies are inferred from the claim text.