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US 4,298,411 AGranted
Crosslinked smokeless propellants
AssigneeHercules Incorporated
InventorJames H. Godsey
Life of this patent
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Abstract
Smokeless crosslinked double-base propellant compositions having good mechanical properties over a wide temperature range are provided. The propellant compositions contain nitrocellulose, energetic plasticizer, a crosslinking agent which is a prepolymer of a hydroxy terminated polyester and a diisocyanate, lead salt and carbon black.
Claims13
A smokeless crosslinked double-base propellant comprising by weight
- (a) from about 7% to about 17.0% nitrocellulose,
- (b) from about 27% to about 63% energetic plasticizer,
- (c) from about 4% to about 12% of a crosslinking agent which is a prepolymer prepared by reaction of a hydroxy-terminated polyester and a diisocyanate,
- (d) from about 0% to about 8% non-energetic plasticizer,
- (e) from about 0.5% to about 6% of lead salt,
- (f) from about 0.1% to about 0.9% carbon black, and
- (g) from about 0% to about 60% of oxidizer comprising cyclotrimethylene trinitramine, cyclotetramethylene tetranitramine, and mixtures thereof.
4 more elements
A smokeless crosslinked double-base propellant comprising by weight:
- (a) from about 7% to about 15% nitrocellulose,
- (b) from about 34% to about 56% nitroglycerin,
- (c) from about 4% to about 10% of a prepolymer consisting essentially of the reaction product of polyglycol adipate and tolylene 2,4-diisocyanate, said prepolymer having a molecular weight range of from about 1000 to about 2000 and an average NCO content from about 3% to about 7% by weight, based on the weight of the prepolymer,
- (d) from about 0% to about 5% of di-n-propyl-adipate,
- (e) from about 2% to about 4% of lead salts selected from the groups consisting of lead salicylate, lead beta-resorcylate and mixtures thereof,
- (f) from about 0.2% to about 0.5% carbon black, and
- (g) from about 10% to about 40% of organic oxidizer selected from the group consisting of cyclotrimethylene trinitramine, cyclotetramethylene tetranitramine, and mixtures thereof.
4 more elements
The method of manufacture of smokeless crosslinked double-base propellant comprising:
- (a) forming a dispersion of lead salts in inert liquid,
- (b) admixing the lead salt dispersion with nitroglycerin, an organic oxidizer and a crosslinking agent which is a prepolymer consisting essentially of the reaction product of a hydroxy terminated polyester and a diisocyanate, to form a slurry,
- (c) admixing nitrocellulose with the slurry and subjecting the resulting admixture to reduced pressure while maintaining agitation and continuing agitation until a smooth free flowing slurry results,
- (d) casting the slurry into a mold, and
- (e) curing the slurry.
2 more elements
Dependencies are inferred from the claim text.