A method for predicting the safe storage life of nepe propellant charge

Abstract

The invention relates to a predication method for a charge safe storage service life of an NEPE (Nitrate Ester Plasticized Polyether) propellant. The predication method comprises the following steps: preparing a No.II centralite effective content near-infrared modeling sample in the NEPE propellant by utilizing a thermal acceleration ageing method, and establishing an NEPE propellant effective No.II centralite content near-infrared quantification model; obtaining a No.II centralite effective content temperature varying coefficient through a thermal acceleration ageing test, and establishing a charge safe storage service life predication equation; taking No.II centralite effective content consumption critical quantity as a critical criterion, and tracking and detecting the effective content of No.II centralite in a charge single temperature thermal acceleration ageing process through a near-infrared method so as to obtain critical time that the effective content reaches the critical criterion; and obtaining the charge safe storage service life of the NEPE propellant at a storage environment temperature through a charge safe storage service life predication equation. According to the method provided by the invention, the safe storage service life can be obtained only if the change of the effective content of the No.II centralite of different ageing time of one charge sample is tracked at one temperature, the sample quantity is reduced by 96%, and the method has the advantages of safety, low cost and time saving.

Description

technical field [0001] The invention belongs to the technical field of propellant and explosive life evaluation, and relates to a method for predicting the safe storage life of propellant and explosive during production and storage. In particular, a near-infrared diffuse reflectance spectrometry is used to detect the effective content of the No. 2 neutralizer in the single-temperature accelerated aging sample of NEPE propellant, and the time it takes for the effective content of the No. 2 neutralizer to reach the critical criterion is obtained and estimated according to the safe storage life. Equation extrapolation, a method for estimating the safe storage life of NEPE propellants at the storage 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] The NEPE propellant formula is added with s...

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Problems solved by technology

[0004] In the past, the thermally accelerated aging method (GJB770B-2005 method 506.1 thermally accelerated aging method for estimating storage life) was used to track the effective content of No. Ⅱ neutralizer to estimate the safe storage life of NEPE propellants. The chemical method (referred to as chemical titration method) or chromatographic method to determine the effective content of No. 2 neutralizer is a destructive detection method. These methods use ether reflux to extract the effective No. 2 neutralizer from crushed samples. , the extraction operation takes 24 hours or even longer, the low boiling point solvent ether is flammable and explosive, has poor safety, the operation is cumbersome, time-consuming, and the bromide produced by chemical titration brings pollution; the NEPE material is aged under different temperatures obtained through The change law of the effective content of the fixed agent in sample No. Ⅱ, when predicting the safe storage life with the Berthelot equation, because 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 preparation of NEPE propellant aging samples by mechanical cutting The risk is high when extracting samples; for the accelerated aging test of NEPE propellant charges with a certain size, heat accumulation will occur during the heating process, resulting in uneven distribution of the content of No. The chemical titration method is used to obtain the content of the No. Ⅱ medium fixed agent to determine the safe storage life. Through the multi-temperature point aging test of the charge, it is very easy to cause an explosion after combustion due to heat accumulation, which cannot meet the chemical safety design and charge storage in the process of new formula development. In the process of estimating the demand for safe storage life estimation, a new method is required

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