The invention discloses a composite additive for
turbine oil. The composite additive comprises
base oil, an anti-oxidant, a rusting inhibitor, a foam inhibitor, a
metal deactivator, an
extreme pressure additive, a demulsification agent,
copper oxide powder and
magnesium metal powder. The anti-oxidant is a mixture of diarylamine and
alkylphenol. The rusting inhibitor is an alkylsuccinic
acid derivative. The foam inhibitor is
polydimethylsiloxane. The
metal deactivator is
triazole. The
extreme pressure additive comprises
alkyl phosphate ester and salt. The demulsification agent is polyalkoxypolyamine. The composite additive comprises, by weight, 12-14% of the anti-oxidant, 9-11% of the rusting inhibitor, 7-9% of the foam inhibitor, 10-12% of the
metal deactivator, 6-8% of the
extreme pressure additive, 11-13% of the demulsification agent, 1-2% of the
copper oxide powder, 1-2% of the
magnesium metal powder and the balance the
base oil. The composite additive is prepared by the simple processes, has a price lower than those of the same types of other products, has high quality, effectively and comprehensively improves performances of the
turbine oil, prolongs a use period of the
turbine oil, improves turbine oil extreme
pressure resistance, comprehensively improves
oxidation resistance,
corrosion resistance, foam resistance and oily
sludge resistance of the turbine oil, is biodegradable and completely exceeds environmental requirements on the same type of products.