IMPERMEABLE LINER-BARRIER FOR PROPELLANTS CONTAINING A HIGH CONTENT OF CARBORANE BURNING RATE ACCELERATOR

Abstract

Disclosed is a liner-barrier system which is impermeable when cured to the high concentrations of carboranyl burning rate accelerator which are incorporated into ultrahigh-burning rate propellants which are being developed for advanced interceptors. The liner-barrier composition, when uncured, comprises a polyvinyl butyral resin coblended with thermosetting resins, such as, phenolic, epoxy etc., that employs triphenylbismuthine as a quick cure catalyst, 4,5-epoxycyclohexylmethyl 4',5'-epoxycyclohexyl carboxylate and polyisocyanate as curative and crosslinking agents to further modify the liner-barrier formulation by reacting with the secondary hydroxyl groups. Further modification of the liner-barrier formulation is achieved by incorporation of aluminum powder to impart additional properties of impermeability. The uncured liner-barrier composition contains from 8.90 to about 10.21 weight percent solids in a solvent blend of isopropyl acetate and isopropyl alcohol which comprises from about 89.79 to about 91.10 percent by weight of the uncured composition.

Source: Google Patents

35 USC §181 Secrecy Order

Inventor

• 1DAVID C. SAYLES

Sensitive facility: Huntsville AL (NASA/Army)