Prediction method for safe storage life of stacked double-base propellants

Abstract

The invention relates to a pre-estimating method of the safe storage life of an accumulated double-base propellant. The method comprises the following steps: preparing a stabilizing agent effective content near infrared quantification model modeling sample by a heat accelerated aging method, obtaining the effective content of a stabilizing agent in a double-base propellant sample by a chemical titration method or a high performance liquid chromatography method, collecting a spectrum by a near infrared diffuse reflection spectrometer, and building a stabilizing agent effective content near infrared quantification model through chemometrics; performing a heat accelerated aging test by taking stabilizing agent effective content critical consumption as a critical criterion, obtaining a temperature coefficient according to a stabilizing agent effective content change rule, and establishing a safe storage life pre-estimation equation; tracking and detecting the effective content of the stabilizing agent in the sample in a single temperature heat accelerated aging process by a near infrared method by taking the stabilizing agent effective content critical consumption as the critical criterion, obtaining the critical time when the effective content of the stabilizing agent reaches the consumption meeting the critical criterion, and obtaining the safe storage life of the double-base propellant at the temperature of a storage environment according to the safe life pre-estimation equation.

Description

technical field [0001] The invention belongs to the technical field of safety evaluation of explosives and relates to a method for predicting the safe storage life of explosives during storage. In particular, a near-infrared diffuse reflectance spectrometry is used to detect the effective content of the stabilizer in the single-temperature heat-accelerated aging sample of the accumulated double-base propellant, and the critical time for the effective content of the stabilizer to reach the critical criterion is obtained. According to the propellant storage life prediction equation , a method for estimating the safe storage life of stacked double-base propellants under storage conditions. Background technique [0002] The safe storage life of propellant and explosive is the storage time before propellant and explosive decomposes without accelerated catalysis under storage conditions. [0003] Nitrocellulose and nitroglycerin are energy components in double-base propellants, a...

AI Technical Summary

Problems solved by technology

[0004] In the past, the thermally accelerated aging method was used to track the effective content of the stabilizer (GJB770B-2005 method 506.1 estimated storage life thermally accelerated aging method) to estimate the safe storage life of the accumulated double-base propellant, and the commonly used chemical titration method (bromine reacts with the stabilizer to form bromide chemical method) or chromatography to determine the effective content of the stabilizer, and use ether to reflux for 24 hours or even longer to extract the effective content of the stabilizer in the crushed sample. The safety of the sample preparation for ether extraction is poor, the operation is cumbersome, time-consuming, and the bromide produced by chemical titration will cause pollution

[0005] According to the change law of the effective content of stabilizer in aging samples of double-base propellants obtained at different temperatures, when predicting the safe storage life with the Berthelot equation, at least 4 temperature points (65°C) are used in the heat-accelerated aging test. , 75°C, 85°C, 95°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 lasts for more than 6 months, which is extremely time-consuming, and long-term high-temperature thermally accelerated aging and passing Mechanical cutting of compound modified double-base propellant aging samples is highly dangerous when preparing samples for extraction

[0006] For the thermally accelerated aging test of stacked double-base propellants with a certain size, heat accumulation will occur during the heating process. On the one hand, it will lead to uneven distribution of temperature field and uneven distribution of stabilizer content. On the other hand, stacked double-base propellants will age at multiple temperature points. The test is very prone to combustion and explosion accidents due to heat accumulation. Therefore, it is difficult to obtain the stabilizer content through the aging test at multiple temperature points of the charge and use chemical titration or chromatography to design the new formula long-life charge and install it during storage. Prediction of drug safe storage life, so new methods are needed

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