초록 ▼

An automated propellant blending apparatus and method uses closely metered addition of countersolvent to a binder solution with propellant particles dispersed therein to precisely control binder precipitation and particle aggregation. A profile of binder precipitation versus countersolvent-solvent r

An automated propellant blending apparatus and method uses closely metered addition of countersolvent to a binder solution with propellant particles dispersed therein to precisely control binder precipitation and particle aggregation. A profile of binder precipitation versus countersolvent-solvent ratio is established empirically and used in a computer algorithm to establish countersolvent addition parameters near the cloud point for controlling the transition of properties of the binder during agglomeration and finishing of the propellant composition particles. The system is remotely operated by computer for safety, reliability and improved product properties, and also increases product output.

대표청구항 ▼

[ We claim:] [1.] Apparatus for manufacturing a solid propellant mixture of oxidant and fuel particles in a binder, comprising:a mixing container;a variable-speed impeller for agitating a mixture of binder, solvent and solid particles in the mixing container;a countersolvent supply system for adding

[ We claim:] [1.] Apparatus for manufacturing a solid propellant mixture of oxidant and fuel particles in a binder, comprising:a mixing container;a variable-speed impeller for agitating a mixture of binder, solvent and solid particles in the mixing container;a countersolvent supply system for adding countersolvent to the mixing container;a decanting line for removing supernatant liquid from the mixing container;a control system for adjusting the speed of the impeller, adjusting the rate of countersolvent addition and actuating liquid removal from the mixing container, said control system including: (a) a countersolvent metering routine for effecting the steps of (1) adding the countersolvent to the mixing container with operation of the impeller up to about a coacervation point, (2) at about the coacervation point, matching the countersolvent addition rate and impeller speed to obtain a desired particle size distribution of the particles aggregated with the binder, and (3) thereafter adding excess countersolvent to the mixing container; and (b) a liquid removal routine for stopping the impeller, allowing particles to settle in the mixing container and actuating a valve in the decanting line to remove supernatant liquid from the mixing container.