DNAN/HMX 熔铸炸药的流变特性

To explore the influence rule of octogen(HMX)solid content, system temperature, HMX particle size, HMX particle gradation and functional additives etc. on the rheological properties of 2, 4-dinitroanisole(DNAN)/HMX suspensions, the apparent viscosity of DNAN /HMX suspensions under different material state conditions was investigated by a digital viscometer. Results show that the suspension presents Newtonian fluid characteristics when the solid content is 3%. Apparent viscosity of the suspension can be described with Ostwald-deWaele model when the HMX solid content is 12%-30%, and the value of non-Newton index n is decreased from 0.842 to 0.374. The influence of temperture on the apparent viscosity can be described by the Arrhenius equation when the temperture is in the range of 95-116℃, and the activation energy Ea increases from 25.97 kJ∙mol^-1 to 30.17 kJ∙mol^-1. The apparent viscosity decrases as the particle size increases. When the particle gradation ratio of 999.5 μm particle size to 132.6 μm is 2: 1, the apparent viscosity reaches the minimum and the solid content is up to 80%. Functional additives N-methyl-4-nitroaniline(MNA)and tri(β chloroethyl)phosphate(CEF)make the apparent viscosity of the suspensions decrease, while dehydrated sorbitol monostearate polyoxyethylene ether(Tween 60), microcrystalline wax-80(MV80), cellu-lose acetate butyrate(CAB), and thermoplastic polyurethane-5720(TPU 5720)make the the apparent viscosity of the suspensions increase.