The Studies Of Superfining Preparations And Properties Of Potassium Picrate And Potassium Perchlorate Coprecipitation Composite Ignition

Potassium picrate and potassium perchlorate microcrystalline coprecipitationcomposite ignition was widely used for its safety in production operation, high ability ofignition and environment friendly. Improving the performance of this ignition powderbecame significant in developing and improving pyrotechnics properties by ultrafiningpreparation process to micro-nanometer level.This studies focused on the crystallization thermodynamics and crystallization kinetics,breakthroughed potassium picrate and potassium perchlorate coprecipitation ultrafinetechnology to micro-nanometer level, explored the expanding volume production practice,researched the properties of ultrafine products. Orthogonal analysis was used to analysis theinfluence factors of product particle size and distribution, accessed optimal manufacturecondition of ultrafine potassium picrate and potassium perchlorate coprecipitation. Theultrafine coprecipitation products were comprehensive analyzed by electron microscope,granularity tester, differential scanning calorimetry (DSC) and thermogravimetric analyzer(TG-DTG). According to requirements of the relative standards, impact sensitivity, frictionsensitivity, flame sensitivity, electrostatic spark sensitivity, electrostatic accumulation,5ssensitivity performance and ignition ability of uitrafine product were measured.These research results show that the fifty percent particle size of ultrafinecoprecipitation achieved4.2microns. During the synthesis process, the strongest influencefactor to particle size was the reaction temperature, the second factors were the pH andreactant concentrations, crystal modifying agent was the weakest. The friction sensitivityand impact sensitivity of ultrafine coprecipitation were equivalent to high explosive, flamesensitivity, electrostatic spark sensitivity and electrostatic accumulation of ultrafinecoprecipitation were better than lead styphnate. The ignition ability of ultrafinecoprecipitation (the fifty percent ignition height of ultrafine coprecipitation in lighting leadstyphnate was20.55cm) was half of ignition ability of black powder (the fifty percentignition height of black powder was44.37cm), But its ignition pressure(4.82MPa) andpeak delay time(3.2ms) were better than that of black powder.