Preparation methods of binding agent for casting and matched curing agent thereof

The invention relates to preparation methods of a binding agent and a matched curing agent thereof, in particular to preparation methods of a binding agent for casting and a matched curing agent thereof. The preparation method of the binding agent for casting comprises the steps that stillingia oil and polyhydric alcohol are added in a reaction kettle, stirring is started, electrical heating is turned on, and nitrogen is introduced into the reaction kettle for protection; the temperature is increased to 130 DEG C, a catalyst is added, and when the material liquid temperature is increased to 210-225 DEG C, a timed reaction is performed for 3-4 hours; after heat preservation is finished, cooling water is introduced to lower the temperature, when the material liquid temperature is lowered to 100-130 DEG C, nitrogen is closed, polybasic acid and a water-carrying agent are added, and the temperature is increased; timing starts to be performed when refluxing occurs in the material liquid temperature increasing process, and a reflux reaction is kept for 0.5-2 hours; after refluxing is finished, cooling water is introduced to lower the temperature; when the material liquid temperature is lowered to 120 DEG C, solvent and a drier are added, the temperature is lowered below 70 DEG C, stirring is stopped, and discharging is performed. The preparation methods are unique and can effectively solve the problem that the stripping time is longer at low temperature, the influence on the usable time of casting sand at low temperature is less, and safety and reliability are achieved.