Patent ID: 6168677
Filing Date: 2001-01-02
Classification: C06B

Abstract:
A lead free and a nitroglycerin free propellant formulation based on eliminating lead containing and nitroglycerin containing compositions from said formulation to achieve an environmentally more attractive propellant formulation based on current environmental protection agency requirements, said lead free and nitroglycerin free propellant formulation comprising in weight percent amounts of ingredients as follows: i. an energetic nitramine polymer from about 6.00 to about 7.00; ii. a plasticizer selected from nitrate ester plasticizers from about 28.00 to about 29.00; iii. carbon black of particle size range from about 70 nanometers to about 270 nanometers from about 0.50 to about 0.60; iv. nitrocellulose as a crosslinking agent for improving mechanical properties from about 0.15 to about 0.25; v. a blended oxidizer of tetramethylene tetranitramine (RDX) and trimethylene trinitramine (HMX) from about 58.00 to about 63.00, said blended oxidizer having particle size and weight percent amounts in said blended oxidizer as follows: 60 weight percent of 17 micrometer particle size of said RDX and 10 weight percent of 4 micrometer particle size of said RDX and 30 weight percent of 2.75 micrometer particle size of said HMX; vi. zirconium carbide of about 7 micrometer particle size from about 1.00 to about 1.50; vii. N-methyl para nitroaniline, as a chemical aging stabilizer from about 0.50 to about 0.75; viii. a ballistic additive selected from bismuth salicylate and bismuth citrate from about 2.00 to about 4.00 with an added trace amount of a cure catalyst of dibutyltin dilaurate when said bismuth citrate is selected; and, ix. A triisocyanate curing agent from about 1.50 to about 1.80.