| 摘要 |
PURPOSE:A metal working oil with excellent emulsion stability and lubricity and usable for both aq. and non-aq. metal working oils, prepd. by adding a maleinized fish oil or its ester to a refined fish oil. CONSTITUTION: A metal working oil contg. either (A) a maleinized fish oil of viscosity of 30-10,000cP at 38.8 deg. obtd. by reacting maleic anhydride with a refined fish oil of an iodine value >=120, or (B) an ester thereof obtd. by reacting a monohydric or polyhydric alcohol with the maleinized fish oil A. The maleinized oil or the ester thereof to be used is obtd. by reacting maleic anhydride at 150-250 deg.C with a refined fish oil obtd. by removing acid and coloring matter from a fish oil. A maleinized oil obtd. by reacting 0.1-40mol of maleic anhydride with 1mol of the refined fish oil is suitable for said metal working oil. |
