Claims
- 1. An improved crosslinked double base propellant composition, the improvement comprising a binder system consisting essentially of nitrocellulose having an intrinsic viscosity of from about 0.4 deciliters/gram to about 1.5 deciliters/gram, an aliphatic diisocyanate, a polyester polyol or polyethe polyol having a molecular weight of from about 400 to about 4000 and a hydroxyl functionality of from about 2.0 to about 2.8, energetic nitrate ester plasticizer and a binder stabilizer, wherein the ratio by weight of NCO groups of the diisocyanate to the combined hydroxyl groups of the nitrocellulose and the polyol is from about 0.7/1.0 to about 1.2/1.0, the ratio by weight of the stabilized energetic nitrate ester plasticizer to the combined weight of nitrocellulose, polyol, binder stabilizer and diisocyanate is from about 2.1/1.0 to about 4.5/1.0, and the ratio by weight 0f nitrocellulose to polyol is from about 0.03/1 to 0.8/1, said binder system containing from about 1.3% to about 4.3% by weight of a binder stabilizer, said nitrate ester plasticizer comprising from about 68% to about 82% by weight of the binder system and said binder system comprising from about 23% to about 30% by weight of the propellant composition.
- 2. The improved crosslinked double base propellant composition of claim 1 in which the binder stabilizer is selected from the group consisting of N-methyl-p-nitroaniline (MNA); N-isopropyl-p-nitroaniline; N-(2-acetoxyethyl)-p-nitroaniline; N-(2-methoxyethyl)-p-nitroaniline; and N-(2,2-dimethoxyethyl)-pnitroaniline.
- 3. The improved crosslinked double base propellant of claim 2 in which the diisocyanate is hexamethylene diisocyanate.
- 4. The improved crosslinked double base propellant of claims 1, 2 or 3 in which a polyester polyol is employed, said polyester polyol being polyglycol adipate having a molecular weight range of from about 2000 to 3000.
- 5. The improved crosslinked double base propellant of claims 1, 2 or 3 wherein the energetic nitrate ester plasticizer is nitroglycerin.
- 6. The improved crosslinked double base propellant of claims 1, 2, or 3 wherein the low molecular weight nitrocellulose has a viscosity of about 0.4 deciliters/gram.
- 7. The improved crosslinked double base propellant composition of claims 1, 2 or 3 in which the binder stabilizer is N-methyl-p-nitroaniline.
Government Interests
The U.S. Government has a paid-up license in this invention and the right in limited circumstances to require the patent owner to license others on reasonable terms as provided by the terms of Contract No. N00030-74-C-0100 awarded by the Department of the Navy.
US Referenced Citations (6)