Optimization Of Surface-modified Technology And Application Of Class D Superfine Chemical Fire Extinguishing Agent

In this paper, Class D superfine particles fire extinguishing agent surface modification technique was studied regarding Class D superfine particles fire extinguishing agent as the research object and the local fire fighting by portable fire extinguisher as the potential purpose. As the extinguishing agent in superfine particles is tend to agglomerate and absorb moisture, its fluidity, dispersing stability, storage are not in good performance. The agglomeration mechanism and inhibition were studied and the appropriate modification technology was chosen:surface chemistry method, dry process, silicone oil as surface modifier, SHR high-speed heating mixer as modified equipment. The fire extinguishing agent was modificated and the treatment effect was evaluated by the hygroscopicity, needle penetration, hydrophobic, bulk density and fluidity, The results show that:the methyl polysioxane fluid202should be chosen as surface modifier, the acid-activated bentonite should be chosen as catalyst, the surface modification on superfine agent under temperature of80℃, mixing up acetone of2.5times the volume of silicone oil and silicone oil of4%the weight of agent, injecting them into materials, keeping stirring for60minutes can obtain the best surface modification effect. In Class D fire suppression experiments, some thermoplastic material was added into the superfine powder extinguishing agent to cover the metal well. Design of fire extinguishers and fire-fighting mode was discussed, the result showed that the best anti-fire efficiency was when the amount of dry powder was2.8kg, the gas pressure was1.2Mpa, the nozzle size was4.25mm, the spray angle was30°.