本文通过对防冻剂的冰点和含冰率研究,揭示其作用机理。根据拉乌尔定律,非电解质稀溶液的饱和蒸气压低于纯水饱和蒸气压,使水溶液中固、液、气三相平衡的冰点降低,冰点降低常数又因种类不同而异,因此对于由多种电解质所组成的复合防冻外加剂,必须由试验来测定其冰点值。 In this paper, the freezing point and ice content of antifreeze were studied to reveal its mechanism of action. According to Raoul’s law, the saturated vapor pressure of the non-electrolyte dilute solution is lower than the saturated vapor pressure of the pure water, so that the freezing point of the three-phase equilibrium of the solid, liquid, and gas in the aqueous solution is decreased, and the freezing point reduction constant varies depending on the species, so that A composite antifreeze admixture consisting of electrolytes must be tested to determine its freezing point value.