Methods and compositions for bonding propellants within rocket m

Details Methods and compositions for bonding propellants within rocket m Methods and compositions for bonding propellants within rocket m

1991-08-15

1993-12-28

Lusigan, Michael

Coating processes

With pretreatment of the base

102290, 149 194, 149 199, 264 31, 427340, B05D 300

Patent

active

052737853

ABSTRACT:
A system and composition is disclosed for binding rocket motor propellants directly to the insulation layer within the rocket motor. Conventionally, it is necessary to place a liner layer between the insulation and the propellant. The present invention is particularly adaptable for use with hydroxy-terminated polybutadiene-type (HTPB) propellants. The method of the invention involves coating the insulation layer with a reactive material, such as a solution of isophorone diisocyanate (IPDI). The reactive material is then allowed to penetrate the insulation layer. Once sufficient penetration is achieved, the HTPB-based propellant is applied over the insulation layer to form a rocket motor propellant grain. The IPDI reacts with both the insulation layer and the propellant and forms a strong bond between the two. In the case of the propellant, additional urethane linkages are generally formed, which results in an area near the bond which may be harder than the propellant grain as a whole. In certain instances it is desirable to add further materials to the reactive material, such as di- and tri-functional aziridines.

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