Smokeless propellant composition containing bismuth-based compound and method of preparing the same

摘要

A smokeless high-energy solid propellant composition, which contains a bismuth-based compound as a combustion improver and exhibits a low pressure exponent, and a method of preparing the same are provided. The propellant composition contains the bismuth-based compound, thus ensuring preparation processability of the propellant, especially pot-life, and thereby a propellant curing system can be changed thus ensuring reliability of the propellant preparation processability, unlike temperature control and curing inhibition catalyst addition methods published to date. This composition advantageously exhibits a low pressure exponent.

主权项

1. A smokeless propellant composition, comprising:
based on a total weight of the composition, 5.0˜15.0 wt % of a binder prepolymer, including a polymer having a hydroxyl group (—OH) at a chain terminal; 10.0˜70.0 wt % of an oxidizer; 1.0˜5.0 wt % of a combustion improver, including bismuth subsalicylate or bismuth salicylate; 0.5˜3.0 wt % of a urethane curing agent, including isophorone diisocyanate (IPDI); 0.1˜1.5 wt % of a cross-linking agent, including trimethylol propane (TMP); and a remainder of one or more additives selected from the group consisting of a propellant aging stabilizer, a plasticizer, a combustion stabilizer, a burning catalyst, a neutral polymeric binder and a urethane curing catalyst wherein the combustion stabilizer is zirconium carbide and is used in an amount of 0.5˜3.0 wt % based on the total weight of the smokeless propellant composition, wherein the burning catalyst is carbon black and is used in an amount of 0.1˜1.0 wt % based on the total weight of the smokeless propellant composition, and wherein the urethane curing catalyst is triphenylbismuth (TPB), and is used in an amount of 0.05˜0.3 wt % based on the total weight of the smokeless propellant composition.