A method for predicting the safe storage life of double-base propellant charges

Abstract

The invention relates to a safe storage life prediction method for explosives charged in a double-base propellant. A near-infrared modeling sample of the effective content of No.II centralite in the double-base propellant is prepared through a thermal accelerated aging method, and a near-infrared quantitative model of the effective content of the No.II centralite in the double-base propellant is established; a No.II centralite effective content change temperature coefficient is obtained through thermal accelerated aging, and a charged explosive safe storage life prediction equation is established; the No.II centralite effective content consumption critical quantity is taken as a critical criterion, the effective content of the No.II centralite in the charged explosive single-temperature thermal accelerated aging process is traced to be detected through a near-infrared method, the critical time when the effective content reaches the critical criterion is obtained, and the safe storage life of the explosives charged in the double-base propellant at the storage environment temperature is obtained through the charged explosive safe storage life prediction equation. According to the method, the safe storage life can be obtained only by tracing the No.II centralite effective content changes of one charged explosive sample at the single temperature at different times through the near-infrared method, the sample quantity is decreased by 96%, and safety, low cost and time saving are achieved.

Description

technical field [0001] The invention belongs to the technical field of life evaluation of propellants and explosives, and relates to a method for rapidly predicting safe storage life of propellants during production and storage. In particular, it uses near-infrared diffuse reflectance spectroscopy to detect the effective stabilizer content of double-base propellant single-temperature accelerated aging samples, obtains the time it takes for the effective stabilizer content to reach the critical criterion, and extrapolates the service environment according to the safe storage life estimation equation Safe storage life at temperature, a method for quickly predicting the safe storage life of double-base propellants at service ambient temperature. Background technique [0002] The safe storage life of propellants and explosives is the storage time before the pyrotechnics and explosives do not undergo autocatalytic decomposition under storage conditions. [0003] Nitrocellulose a...

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Problems solved by technology

[0004] In the past, the thermal accelerated aging method was used to track the effective stabilizer content to estimate the safe storage life of double-base propellants. The chemical method of bromine reacting with stabilizer to form bromide (referred to as chemical titration method) was commonly used as a destructive detection method. Ethyl ether reflux extracts the effective No. Ⅱ neutralizer. The extraction operation takes 24 hours or even longer. The low boiling point solvent ether is flammable and explosive, and has poor safety. The operation is cumbersome and time-consuming, and the bromide produced by chemical titration brings pollution; According to the change law of the effective stabilizer content of aging samples of double-base propellant materials obtained at different temperatures, when using the Berthelot equation to estimate the safe storage life, since the accelerated aging test uses at least 4 temperature points (55°C , 65°C, 75°C, 85°C), the number of sampling at each temperature point is at least 6 times, the amount of aging samples required is large, and the test duration is more than 6 months, which is extremely time-consuming, and the long-term high-temperature accelerated aging and mechanical Cutting double-base propellant aging samples to prepare samples for extraction is highly risky; for double-base propellant charges with a certain size, the accelerated aging test will generate heat accumulation during the heating process, resulting in uneven distribution of stabilizer content, so it is difficult to Through the multi-temperature point aging test of the material and the use of chemical titration to obtain the stabilizer content to determine the safe storage life, through the multi-temperature point aging test of the charge, it is very easy to cause explosion accidents after combustion due to heat accumulation, and it is difficult to meet the chemical safety in the process of developing new formulas. New methods are needed to estimate the demand for safe storage life estimation in the process of design and charge storage

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