Water-based release agent for die casting

The present invention provides a die casting release agent which can be used regardless of low/high-speed die casting by improving productivity/operating environment while having excellent molten metal heat retaining properties. In the aqueous mold release agent for die casting, the phyllosilicate mineral is dispersed at a concentration of 0.005 wt% or more and less than 5 wt%, and the particle size of the phyllosilicate mineral when dispersed is 0.1 [mu] m or less. 本发明提供在熔融金属保温性优异的同时、可以实现生产率/操作环境的改善、从而无论低速/高速压铸均可使用的压铸脱模剂。压铸用水性脱模剂中，层状硅酸盐矿物以0.005wt％以上且小于5wt％的浓度分散，所述层状硅酸盐矿物分散时的粒径为0.1μm以下。