Claims
- 1. A process for preparation of slurry cast propellant compositions which exhibit improved burning rates, said process comprising (a) preparing an initial propellant slurry comprising a casting solvent, low viscosity nitrocellulose containing 12% nitrogen by weight, a polyol having a molecular weight of from about 2000 to about 6000 and a hydroxyl functionality of from about 2 to about 3, a polyfunctional isocyanate crosslinking agent, and solid oxidizing agents selected from organic nitramines and organic nitro compounds; (b) admixing double base casting powder granules with said propellant slurry, said casting powder granules comprising from about 10% to about 25% by weight, based on the weight of the resulting propellant slurry, said casting powder granules containing from about 20% to about 75% ammonium perchlorate having a particle size range of from about 0.5 micron to about 3.0 microns provided that if about 50% of the ammonium perchlorate in said granules has a particle size of about 0.5 micron the total perchlorate content of said casting powder shall not exceed 65% by weight; (c) casting the slurry of step (b), and (d) curing said slurry forming a crosslinked double base propellant composition.
- 2. The process of claim 1 in which the initial propellant slurry of step (a) comprises from about 5% to about 50% of nitroglycerin, from about 5% to about 12% of nitrocellulose containing 12% N having a viscosity of 18-25 centipoises and polyglycol adipate, from about 0.8% to about 2.0% of crosslinking agent, about from about 30% to about 50% of solid organic oxidizer.
- 3. The process of claim 2 in which the casting powder granules of step (b) comprises from about 20% to about 75% of ammonium perchlorate, from about 5% to about 40% of nitro cellulose containing 12.6% N and having a viscosity of 10-20 seconds, and from about 10% to about 40% of explosive plasticizer.
BACKGROUND OF THE INVENTION
This application is a continuation-in-part of U.S. Ser. No. 108,268 filed Dec. 28, 1979, and now abandoned.
US Referenced Citations (10)
Foreign Referenced Citations (2)
Number |
Date |
Country |
1317431 |
May 1973 |
GBX |
2010240 |
Jun 1979 |
GBX |
Non-Patent Literature Citations (1)
Entry |
AIAA Journal, vol. 17, No. 8, Aug. 1979, Article No. 78 981R entitled "Oxidizer Size Distribution Effects on Propellant Combustion", by J. P. Renie, J. A. Condon and J. R. Osborn. |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
108268 |
Dec 1979 |
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