Composite hardener for soluble glass shell manufacture adopting investment casting as well as preparation method of composite hardener

The invention provides a composite hardener for soluble glass shell manufacture adopting investment casting as well as a preparation method of the composite hardener, belongs to a composite hardener for glass shell manufacture, and mainly solves the technical problems that the conventional composite hardener for glass shell manufacture radiates out strong and sharp odor, the surface quality of a surface layer is difficult to improve, the utilization rate of ammonium chloride and magnesium chloride is low, workshop operation is difficult, detects exist during separate application of ammonium chloride and magnesium chloride and the like. The key point of the technical scheme is that the composite hardener comprises MgCl2, NH4CL and Na2SiO3, and the principles are as follows: NH4CL plus Na2SiO3 is equal to NH3 plus NaCl plus SiO2, MgCl2 plus Na2SiO3 is equal to Mg (OH)2 plus NaCl plus SiO2, MgCl2 plus NH3 plus H2O is equal to NH4CL plus Mg(OH)2, and Mg(OH)2 plus HCl is equal to MgCl2 plus H2O. The composite hardener is mainly used for soluble glass shell manufacture adopting investment casting.