The invention discloses a green
microemulsion metal cutting fluid and is characterized in that its formula comprises mixed
base oil, synthetic ester, an oiliness agent, an extreme pressure
antiwear additive, a clean dispersant agent, an antirust anticorrosion additive, an anti-oxidant, an
oil mist inhibitor, a bactericide, an antifoaming agent, an anionic surfactant, a
nonionic surfactant and a cosurfactant. A preparation method of the green
microemulsion metal cutting fluid comprises the following steps of: firstly preparing an
oil phase, heating the
base oil to 50-60 DEG C, successively adding the oiliness agent, synthetic ester, the extreme pressure
antiwear additive, the clean dispersant agent and the antirust anticorrosion additive, uniformly stirring and mixing to prepare an
oil phase system; then preparing a water phase, successively adding the bactericide and the antifoaming agent into water, uniformly stirring and mixing to prepare a water phase
system; finally emulsifying the systems, and slowly adding the water phase into the
oil phase system to form the green
microemulsion metal cutting fluid. The green microemulsion
metal cutting fluid provided by the invention has advantages of excellent extreme pressure
wear resistance, resistance to
hard water, long using period and the like.