Impermeable liner-barrier for propellants containing a high cont

Details Impermeable liner-barrier for propellants containing a high cont Impermeable liner-barrier for propellants containing a high cont

1983-04-01

1988-05-17

Miller, Edward A.

Ammunition and explosives

Powder form

Having burning inhibiting means

F42B 100

Patent

active

047442999

ABSTRACT:
Disclosed is a liner-barrier system which is impermeable when cured to the igh 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.

REFERENCES:
patent: 3954701 (1976-05-01), Schaffling
patent: 3999382 (1976-12-01), Clifford et al.
patent: 4187215 (1980-02-01), Wrightson
patent: 4304185 (1981-12-01), Sayles
patent: 4363273 (1982-12-01), Luebben et al.
patent: 4375522 (1983-03-01), Braun

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