Inhibitor and Barrier for Use with High Energy Rocket Propellants.
Patent, Filed 24 Jan 83, patented 27 Aug 91,
DEPARTMENT OF THE NAVY WASHINGTON DC
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A flame inhibitor coating for application to those surfaces of a solid propellant grain in a rocket motor where burning is not desired such as the aft end of a perforated propellant grain which includes a barrier layer of a mixture of amine silane, a trialkoxypropylsilylamino prepolymer, and diglycidylether of polypropylene glycol, an epoxy applied to the grain surface and allowed to cure to a polysiloxane layer, and a flame inhibitor layer applied over the barrier layer consisting of a mixture of hydroxyl terminated polybutadiene and dimeryl diisocyanate with flake aluminum which is applied over the barrier layer and allowed to cure. The barrier layer prevents migration of nitrate esters from the solid propellant grain to the flame inhibitor layer thus preventing peeling and reduction of flame inhibiting properties. The polysiloxane barrier layer is also useful in itself as a flame inhibitor and can also be employed between the insulatorliner of the rocket motor and the solid propellant grain.
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