Hydroxyl-terminated polybutadiene composite solid propellant with high strength and low pressure index, and preparation method thereof

Abstract

The invention belongs to the field of production of composite solid propellants, and discloses a hydroxyl-terminated polybutadiene composite solid propellant with a high strength and a low pressure index. The composite solid propellant comprises, by mass, 73-73.5% of an oxidant, 14% of metal powder, 5.95% of a bonding system, 3.5% of a plasticizer, 2% of a combustion catalyst, 0.5-1% of a pressureindex regulator, 0.4% of a bonding agent and a reinforcing agent, and 0.15% of a curing catalyst and an antioxidant. The invention also discloses a preparation method of the composite solid propellant. The preparation method comprises the following steps: 1, pre-baking solid raw materials: sieving ammonium perchlorate and aluminum powder; 2, weighing and premixing: premixing the raw materials according to the above mass proportions, adding the aluminum powder, and performing premixing; 3, mixing : adding the oxidant to the obtained premixed slurry in batches, performing uniform mixing, addingthe curing agent, and performing mixing; 4, casting: casting a propellant slurry by a vacuum casting process; and 5, curing: heating and curing a mold and an engine shell which are filled with the propellant slurry. The composite solid propellant can meet the requirements of charges of rockets and missile solid engines in a high-overload and high-pressure working state.

Description

technical field [0001] The invention relates to the field of composite solid propellant manufacture, in particular to a high-strength, low-pressure index butylated-hydroxy composite solid propellant and a preparation method thereof. Background technique [0002] Rockets and missiles are required to have high modulus and high tensile strength properties in order to prevent solid motor grains from deforming or even cracking during high-overload flight. [0003] With the development of rocket and missile technology, higher and higher requirements are put forward for the energy of solid motors. More and more engine design units adopt the technical approach of increasing the working pressure of the engine and increasing the energy of the propellant. With the increase of working pressure, the propellant pressure index of butyl-hydroxyl propellant increases, which is manifested in the rapid increase of combustion speed with the increase of pressure, which leads to a further increa...

AI Technical Summary

Problems solved by technology

With the increase of working pressure, the propellant pressure index of butyl-hydroxyl propellant increases, which is manifested in the rapid increase of combustion speed with the increase of pressure, which leads to a further increase of engine pressure and damages the structural integrity of the engine during operation

Images