Method for estimating safe storage life of three-base propellant in stacked storage

Abstract

The invention discloses an estimation method for the safe storage life of stacked stored triple-base propellants. The method is characterized by comprising the steps of making a modeling sample of a No. II centralite active content near infrared quantitative model by using a thermal accelerated aging method, collecting spectra by adopting a near infrared diffuse reflection spectrograph, and establishing the No. II centralite active content near infrared quantitative model; then carrying out a single-temperature accelerated aging test, tracking and detecting the active content of a No. II centralite of the stacked propellants in the aging process by adopting a near infrared method, and extrapolating the safe storage life at the storage environment temperature according to an estimation equation. The method is quick, safe, non-destructive and simple in operation, modeling samples of near infrared quantitative models of active content of different No. II centralites are obtained by controlling the sampling time, and the defect of non-uniform distribution of low-content samples in process manufacturing is overcome. Meanwhile, the dangerous operation process of mechanical pulverization of samples needed for No. II centralite extraction in a chemical titration method is also solved, the intrinsic safety is realized, and the cost is greatly reduced at the same time.

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 No. 2 medium-fixed agent in the single-temperature heat-accelerated aging sample of accumulated three-base propellants, and obtain the time taken for the effective content of the No. 2 medium-fixed agent to reach the critical criterion. According to the safety storage The extrapolation of the life estimation equation is a method for estimating the safe storage life of the accumulated three-base propellant (SG) at the storage environment temperature. Background technique [0002] The safe storage life of propellants and explosives is the storage time before propellants and explosives undergo accelerated catalytic decomposition under storage conditions. [0003] Adding another...

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Problems solved by technology

[0005] In the past, the thermal accelerated aging method was used to track the effective content of No. Ⅱ intermediate stabilizer (GJB770B-2005 method 506.1 estimated storage life thermal accelerated aging method) to estimate the safe storage life of the three-base propellant, and the commonly used chemical titration method (reaction of bromine and stabilizer Chemical method for generating bromide) or high performance liquid chromatography to determine the effective content of No. Ⅱ neutralizer, and use ether to reflux for 24 hours or even longer to extract the effective content of No. 2 neutralizer from the pulverized sample. The low boiling point solvent ether is flammable Explosive, poor safety when preparing samples for ether extraction by mechanically pulverizing aging samples of three-base propellants, cumbersome and time-consuming operations, and bromide produced by chemical titration brings pollution

[0006] For the three-base propellant, the change law of the effective content of the aging sample No. Ⅱ neutralizer at different temperatures obtained through the thermally accelerated aging test, when using the Berthelot equation to estimate the safe storage life, due to the thermally accelerated aging test at least Four temperature points (65°C, 75°C, 85°C, 95°C) are used, and 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 heat-accelerated aging and preparation of extraction samples by mechanically cutting the aging samples of the three-base propellant are highly dangerous;

[0007] When estimating the safe storage life of three-base propellants with a certain stack size (stacked three-base propellants) during storage, heat accumulation will occur during the heating process through the thermally accelerated aging test. The content distribution is not uniform. On the other hand, the multi-temperature point heat-accelerated aging test of the three-base propellant is very prone to combustion and explosion accidents due to heat accumulation. Therefore, it is difficult to pass the multi-temperature point aging test and use chemical titration or high performance liquid chromatography. A new method is needed to obtain the content of stabilizer, to carry out the chemical safety design in the process of research and development of new formula and to estimate the safe storage life in the storage process.

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