Novel water mist additive and its preparation method

The invention discloses a novel water mist additive and is characterized in that the water mist additive is composed of a fluorinated surfactant, alkali metal salt, a heat-sensitive material and water according to additive mechanism. The novel water mist additive has excellent fire extinguishing performance and causes no pollution to the scene. In addition, each component used is harmless to human body. In comparison with present preparation methods, the preparation method provided by the invention has the following advantages: the preparation can be completed through physical mixing of each component and the additive is stable; there is no special requirement on preparation, transportation and production of the additive; and the cost is low.