The invention discloses a water-based
release agent for aluminum
alloy die casting and a preparation method thereof. The
release agent comprises, by
mass, 10 to 30% of dimethicone, 5 to 15% of modified
silicone oil, 5 to 20% of a
wax composition, 4 to 15% of a surfactant, 1 to 3% of an anti-
rust corrosion inhibitor and 0.1 to 1% of a bactericide, with the balance being deionized water. The preparation method comprises the following steps: heating dimethicone, modified
silicone oil, the
wax composition and the surfactant to a temperature of 70 to 80 DEG C and carrying out uniform mixing with stirring; slowly adding deionized water accounting for 30 to 40% of the total weight of the
release agent with stirring in batches so as to prepare an oil-in-water O / W pre-
emulsion; and carrying out
grinding by using a
colloid mill and adding the anti-
rust corrosion inhibitor, the bactericide and residual deionized water so as to obtain the water-based release agent with an
emulsion particle size of 0.1 to 0.4 mu m. According to the invention, modified
silicone oil is used as main
base oil, so emulsification difficulty is lowered down,
heat resistance is improved, and good high temperature stability is obtained; the
wax composition has excellent
lubrication capability and a good film forming effect. The release agent has excellent
heat resistance, excellent
lubricity and a good film forming effect.