Inhibitors for cone-free end-burning of double base propellant g

Details Inhibitors for cone-free end-burning of double base propellant g Inhibitors for cone-free end-burning of double base propellant g

1987-08-20

1988-09-06

Terapane, John F.

Coating processes

Applying superposed diverse coating or coating a coated base

Synthetic resin coating

102290, 102291, 523180, C01B 1500

Patent

active

H00005231

ABSTRACT:
A double base propellant grain inhibitor is comprised of a hydroxyl-termied polybutadiene polymer having from 2 to about 3 hydroxyl groups per average molecule and an approximate molecular weight of 2800 to 3600, an inert filler, a cross-linking agent, a thickening agent, an antioxidant, a curative, and a catalyst. When properly applied to the surface of a propellant grain, the inhibitor bond does not weaken with age and the inhibitor produces planar, no-cone grain burning having a constant chamber pressure during the burning of the propellant grain. A 1,4-butylene oxide-type polyether barrier layer consisting of a poly-1,4-butylene oxide diisocyanate with an approximate molecular weight of 850 to 1000, a diol curative, a triol cross-linker, and antioxidant and a cure catalyst can be added between the propellant grain and inhibitor to reduce propellant plasticizer migration.

REFERENCES:
patent: 3433158 (1969-03-01), Pierce
patent: 3815506 (1984-06-01), Tamulevich
patent: 3985592 (1976-10-01), Hackett

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