The invention discloses an
emulsion stabilizer as well as a preparation method and application thereof, and belongs to the technical field of lubricating oil. The
emulsion stabilizer is prepared from the following components in parts by weight: 20 to 30 parts of nonyl-N-(nonylphenyl)
aniline, 0.1 to 1 part of
diphenylamine, 0.1 to 10 parts of
nonionic surfactant, 1 to 10 parts of
solvent refined heavy paraffin fraction, 1 to 10 parts of
solvent dewaxed heavy paraffin fraction, 30 to 50 parts of hydrogenated
petroleum heavy
alkane fraction and 5 to 10 parts of
molybdenum-containing composition, wherein the
molybdenum-containing composition is a
reaction product of N, N-bis (hydroxyethyl)
cocamide, glyceryl monooleate and
molybdenum oxide. The
emulsion stabilizer is applied to lubricating oil of a
hybrid power engine, the emulsion stability is good, the abrasion resistance,
oxidation resistance,
water resistance and
corrosion resistance of the lubricating oil in the
hybrid power engine can be remarkably improved, meanwhile, good low-temperature fluidity and high-temperature stability are kept, and the influence of
free water on the lubricating
oil can be effectively reduced.