Preparation Of The Anti-caking Ultrafine Ammonium Perchlorate And Its Application

Based on the caking mechanism of ultra-fine ammonium perchlorate (AP) powder resulted from salt bridge, we modified AP with composite modifying agent. Then we explored the feasibility of producing ultra-fine AP powder which can be stored in a long-term under industrial conditions. Moreover, FTIR was used to analyze the structure of modified AP, in order to raise a reasonable anti-agglomerated model.This thesis focuses on the following three parts:The modifying agent, which can prevent agglomeration of the ultra-fine AP, was composed of three main components :the nano scale inert inorganic compound and two other organic reagents.Jet Milling technic was used for preparing the anti-agglomerated untra-fine AP powder.Experiments proved that this kind of untra-fine AP powder can be stored for more than 6 months under the conventional storage conditions.Some exploratory experiments that can store ultrafine AP powder for long time in industrial production were experimentalized.Under industrial production conditions,we have produced nearly 100 kilograms of ultrafine AP powder by using modifying agent prepared and carried out application research, including ultrafine AP powder's impacts on mechanical properties of the propellant, performances of combustion and safety. Experiments have proved that this modifying agent has a good effect on anti-agglomeration, with considerable prospect of industrial application.Modifying agent and its components were tested respectively by FTIR and other methods, and the interactions of various components were analyzed. We have designed a reasonable model of anti-agglomeration: sub-micron modifying agent was attached to the surface of ultra-fine AP powder through certain chemical bonds,keeping moisture outside and increasing the space among them.This can explain the experimental phenomena and its law regularity adequately.