Method of controlling the increase in potlife of propellants dur

Details Method of controlling the increase in potlife of propellants dur Method of controlling the increase in potlife of propellants dur

1991-05-20

1992-05-12

Lechert, Jr., Stephen J.

Explosive and thermic compositions or charges

Processes of making

149 42, 149 76, 149 194, 149 199, 1491088, 149113, 149 21, D03D 2300

Patent

active

051124173

ABSTRACT:
Tris(N-nitrosophenylhydroxylaminium)aluminum is employed in amounts from about 0.1% by weight to about 0.2% by weight to inhibit the polymerization reaction during propellant mixing. With a weight percent of 0.2 percent, the inhibitor inhibited polymerizaiton to control end-of-mix viscosities to 12 Kp and 13 Kp compared to control propellant viscosities of 26 Kp and 39 Kp after 8 hours and 10 hours respectively. The test propellant and control propellant contained the name ingredients with the exception of the 0.2% additive of the inhibitor in the test propellant. The propellant composition for control and test comprised ammonium perchlorate of 400 micrometer, 200 micrometers, and 20 micrometers in weight percent amounts of 29.5,30.0, and 5.0 respectively, aluminum powder 14.0 weight percent, cyclotetramethylenetetranitramine oxidizer of 4 micrometers particle size in amount of 10.0 weight percent, and hydroxyl-terminated polybutadiene prepolymer binder in a weight percent amount of 11.4 with an isophorone diisocyanate curative and crosslinking agent with an isocyanate to hydroxyl ratio of 0.89 weight percent.

REFERENCES:
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patent: 3953260 (1976-04-01), Braun et al.
patent: 4019933 (1977-04-01), Cuksee et al.
patent: 4181545 (1980-01-01), Anderson
patent: 4925504 (1990-05-01), Sayles
patent: 5002797 (1991-03-01), Sayles

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