Explosive and thermic compositions or charges – Structure or arrangement of component or product – Solid particles dispersed in solid solution or matrix
Patent
1983-08-26
1990-07-17
Miller, Edward A.
Explosive and thermic compositions or charges
Structure or arrangement of component or product
Solid particles dispersed in solid solution or matrix
149 2, 149 194, 149 199, 149 20, 149 21, 252350, C06B 4510
Patent
active
049419315
ABSTRACT:
Mechanical enhancement of the burning rate of solid propellants is achieved y the incorporation of limited percentages of gas-generated-expandable beads into the solid propellant composition during propellant mixing and which are chemically crosslinked during propellant curing to a solid propellant grain. When the flame front reaches an individual bead during propellant grain burning, the bead which contains a blowing agent selected from 4-toluenesulfonyl hydrazide and 4,4'-oxybis(benzenesulfonyl hydrazide) and coated with a bead forming material consisting of about 95 parts by weight hydroxyl-terminated polybutadiene prepolymer, of about 5 parts by weight of trimethylolpropane, and of about 6 parts by weight of isophorone diisocyanate expands to several times its volume and ruptures. Bead expansion or rupture causes a disruption of the propellant's surface, and the flame can penetrate into the propellant. The penetration results in a major increase in burning rate. An increase in propellant density and an improvement in mechanical properties are achieved as a result of the beads being chemically crosslinked during propellant curing after being first physically dispersed in the propellant composition during propellant mixing.
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Bellamy Werten F. W.
Miller Edward A.
The United States of America as represented by the Secretary of
Voight Jack
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