Formulation And Preparation Of Insensitive Booster Based On TATB

TATB, as a IHE, with the detonating velocity of 8000km/s, presents outstanding heat resistance. At the same time, HMX is regarded as the best explosive with outstanding comprehensive properties and poor sensitivity. Accordingly, the composite explosive of TATB and HMX can desensitize HMX, meeting the insensitive munition need in modern war. This paper is aimed to identify an insensitive booster based on TATB/HMX with high performance by selecting the proper bond of insensitive booster based on TATB/HMX as well as testing the properties of different PBXs based on TATB/HMX. Then, the study of preparation of PBX was conducted. The paper concerns about four parts as following.1)Bonding properties of different PBXs based on TATB/HMX were simulated by molecular simulation based on molecular dynamic. The results show that, the bonding energy values vary with different binders such as F2311,F2314,VitonA. Although, the differences are unconspicuous, the bonding of VitonA and TATB/HMX is the weakest one. Except for the propertie of elongation at break, the VitonA is superior than F2311 and F2314 in other properties such as high temperature resistance、weather resistance、electric insulativity、stretchability of vulcanized rubber、thermal oxidation resistance. As a result, VitonA is selected as the proper binder for its comprehensive properties.2) The recrystallizing process was named as solvent/anti-solvent technique using the ionic liquid 1-ethyl-3-methylimidazolium acetate([Emim]Ac) combined with DMSO serving as solvent, distilled water as anti-solvent. In order to study best conditions for Nano-TATB preparation, The four key factors effect the recrestallized TATB are studied. Results show that, when ratio of solvent to anti-solvent is 1/20 and 1/3 respectively, the recrestallized TATB solids are granules and layered accordingly. Stirring effects both morphology and size of recrestallized TATB. Greater stirring rate means better morphology and smaller size. Both greater dropping rate and temperature difference mean greater degree of supersaturation, leading to large quantity of crystal nucleus nucleation. As a result, the size of crystal becom smaller. Under the best conditions, Nano-TATB solids were prepared and characterized by SEM, DSC, XRD, size analysis, impact tests, and so on. The results show that, nano-TATB particles with a spherical shape range from 30 nm to 100 nm. The XRD pattern of recrystallized TATB is in good agreement with the raw TATB, indicating that this recrystallization process does not change the crystal type of TATB. The recrystallized TATB has a remarkable thermal stability in spite of the low temperature of exotherm peak than the raw TATB at various heating rates The drop height of recrystallized TATB is higher than 100 cm, revealing that the nano-TATB particles exhibit outstanding insensitive characteristic.3) TATB/HMX based PBX solids were prepared using slurry coating technique and the factors effect the coating process such as binder solution concentration, ratio of material to liquid(mass ratio of TATB/HMX to purified water), stirring, vacuume pressure and maturing time were studied. The results show that, greater binder solution concentration leads to small dropping rate. The ratio of material to liquid implies the water mass. When the ratio of material to liquid is 1:10, the polishment effect of water is obvious. As the result the PBX solids are smooth. Greater stirring rate leads small size. When the vacuume pressure is zero, the PBX solids are flat. when the vacuume pressure is 0.050 MPa, the PBX solids have small cavities. The vacuume pressure of 0.045 MPa is the best condition. If maturing time last too long, the PBX solids will have small cavities, too. Under the conditions of temperature of 60℃, vacuume pressure of 0.045 MPa, the agitating rate of 500r/min and the maturing time of 3 min, the bulk density of TATB/HMX based PBX reach to the highest value of 0.8240g/cm3.4)SEM test of PBX solids show that the solids are smooth, spherical with size of 360μm. The XRD pattern of the PBX solids contains no but the characteristic peaks with the same incident angle of TATB as well as HMX, meaning that coating process does not change the crystill structure. DSC tests suggest that the mixed systems have lower exothermic temperatures than that of single, as well as the active energy. The differences are far below the dangous levels of 2℃ for exothermic temperature and 20% for active energy respctively, implying that the PBXs based on TATB/HMX with VitonA as bond have good compatibility.5)During both slow and fast cook-off tests, the reaction of TATB based PBX is deflagration, the G50 of TATB small-scale gap test is 5.62 mm, 20 samples present resistence at the drop height of 100 cm with hammer of 2.5kg. Conclusionly, TATB based PBX has good performance under both slow and fast cook-off tests, impact tests as well as small-scale gap test. When the density is 92% T.M.D., TATB based PBX show outstanding dentonation velocity of 7863m/s, while the calculated value is 7942m/s, meeting the need of booster.