Ammonium phosphate dry powder fire extinguishing agent is referred to as ABC dry powder fire extinguishing agent for short. The main content can be dry powder ABC 50%, dry powder ABC 70%, dry powder chemical ABC 90% etc. Among them, ammonium dihydrogen phosphate (NH4H2PO4) plays a major role in extinguishing fire, and the remaining auxiliary materials play functions such as anti-caking and additives.
Ammonium phosphate dry powder fire extinguishing agent is mainly divided into three categories:
1) dry powder based on ammonium phosphate or ammonium pyrophosphate;
2) mixed dry powder based on ammonium phosphate or ammonium sulfate;
3) based on polyphosphoric acid The ammonium salt is a dry powder of the base material.
The ammonium phosphate dry powder fire extinguishing agent is more widely used than the BC dry powder fire extinguishing agent. In addition to the fire extinguishing function of the BC fire extinguishing agent, it can also extinguish Class A solid fires; it can extinguish not only plane fires but also three-dimensional space fires. In addition, the ammonium phosphate dry powder fire extinguishing agent has been widely used because of its high fire extinguishing efficiency, fast speed, wide range of raw material sources, no toxicity to the environment, humans and animals, no need for special power and wide operating temperature. Due to the multi-purpose use of ammonium phosphate fire extinguishing agent, it provides greater convenience for replacing a variety of highly specialized fire extinguishing agents with a single fire extinguishing agent. In addition, the environmental protection campaign to phase out "halon" fire extinguishing agents has been launched worldwide. China plans to phase out 121l in 2005 and "halon" 1301 in 2010. Therefore, it is imperative to look for the development of new environmentally friendly fire extinguishing agents to replace the "halon" fire extinguishing agent. The ammonium phosphate dry powder fire extinguishing agent is expected to become an ideal product to replace the "halon" fire extinguishing agent.
Composition and formula design of ammonium phosphate dry powder fire extinguishing agent
The ammonium phosphate dry powder fire extinguishing agent is mainly composed of active fire extinguishing components, hydrophobic components, inert fillers and other components. The hydrophobic components are mainly silicone oil and hydrophobic white carbon; there are a wide variety of inert fillers, which are mainly used to prevent vibration and block, improve the powder movement performance and electrical performance, catalyze the polymerization of linear silicone oil, and improve the compatibility with foam fire extinguishing agents.