Prediction method of safe storage life of composite modified double base propellant charge

Abstract

The invention relates to a composite modified double-base propellant charging safety storage life estimating method. A heat acceleration aging method is used for preparing a model building sample of a composite stabilizing agent effective content near infrared quantitative model in the composite modified double-base propellant; a composite stabilizing agent effective content near infrared quantitative model is built; the composite stabilizing agent effective content change temperature coefficient is obtained through heat acceleration aging test; a charging safety storage life estimation equation is built; the composite stabilizing agent effective content consumption critical quantity is used as the critical judging basis; a near infrared method is used for tracking and detecting the charging single temperature heat acceleration aging process composite stabilizing agent effective content; the critical time consumed when the effective content reaches the critical judging basis is obtained; the safety storage life at the composite modified double-base propellant charging storage environment temperature is obtained by the charging safety storage life estimation equation. The method has the advantages that the composite stabilizing agent effective content of one charging sample at one temperature in different aging time can be tracked only by the near infrared method; the safe storage life can be obtained; the sample quantity is reduced by 96 percent; safety is high; the low is low; the time is saved.

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 storage. In particular, a near-infrared diffuse reflectance spectrometry is used to detect the effective content of the composite stabilizer in the single-temperature heat-accelerated aging sample of the composite modified double-base propellant charge, and the critical time for the effective content of the composite stabilizer to reach the critical criterion is obtained. The formula for predicting the safe storage life of medicines, and the method for predicting the safe storage life of composite modified double-base propellant charges under the storage environment. Background technique [0002] The safe storage life of propellants and explosives is the storage time before the propellant and explosives undergo autocatalytic accelerated decomposition under storage condi...

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Problems solved by technology

[0004] In the past, the thermally accelerated aging method was used to track the effective content of the composite stabilizer (GJB770B-2005 method 506.1 estimated storage life thermally accelerated aging method) to estimate the safe storage life of the composite modified double-base propellant, and the commonly used chemical titration method (bromine reacts with the stabilizer The chemical method of generating bromide) or chromatographic method to determine the effective content of the compound stabilizer is a destructive detection method. The effective content of the compound stabilizer in the pulverized sample is extracted by ether reflux for 24 hours or even longer. The low boiling point solvent ether is flammable and explosive. , the safety of preparing ether extraction samples by mechanically pulverizing composite modified double-base propellant aging samples is poor, the operation is cumbersome, time-consuming, and bromide produced by chemical titration brings pollution

[0005] According to the change law of the effective content of the composite stabilizer in the composite modified double-base propellant aging samples obtained at different temperatures, when using the Berthelot equation to estimate the safe storage life, since the thermally accelerated aging test uses at least 4 temperatures points (65°C, 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 requires long-term high-temperature heating. Accelerated aging and preparation of samples for extraction by mechanically cutting composite modified double-base propellant aging samples is highly dangerous

[0006] For the thermally accelerated aging test of composite modified double-base propellant charge with a certain size, heat accumulation will occur during the heating process, which will lead to uneven distribution of temperature field and uneven distribution of stabilizer content on the one hand. The multi-temperature point aging test of the double-base propellant charge is very prone to combustion and explosion accidents due to heat accumulation. Therefore, it is difficult to obtain the stabilizer content through the multi-temperature point aging test of the charge and use chemical titration or chromatography to carry out new formulations. The design of long-life charges and the estimation of safe storage life of charges during storage require new methods

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