Charging stable period fast estimating method of composite modification double-base propellant

Abstract

The invention relates to a charging stable period fast estimating method of a composite modification double-base propellant. A heat acceleration aging method is used for preparing an model building sample of a composite stabilizing agent effective content near infrared quantitative model in the composite modification double-base propellant; a chemical titration method or a high efficiency liquid chromatography method is used for obtaining the effective content chemical value of the composite stabilizing agents; an near infrared spectrograph collects the spectrograph; the composite stabilizing agent effective content near infrared quantitative model is built through chemometrics; a stable period estimation equation is built by a reliable temperature coefficient r0; the composite stabilizing agent effective content in the single temperature charging column heat acceleration aging process is detected in a tracking way by a near infrared method; the critical time of reaching the critical criterion consumption of the composite stabilizing agent effective content is obtained; the outwards pushing work condition and the stable period at the storage environment temperature are estimated according to the stable period estimation equation. The method has the advantages that the stable period can be obtained only by nondestructively tacking the effective content of different aging time of one charging sample at one temperature by the near infrared method; the sample quantity is reduced by 96 percent; the speed is high; safety and low cost are realized.

Description

technical field [0001] The invention belongs to the technical field of safety evaluation of explosives, and relates to a method for rapidly predicting the working conditions and stability period of explosives during storage. In particular, a near-infrared diffuse reflectance spectrometry is used to detect the effective content of the composite stabilizer of the composite modified double-base propellant single-temperature thermally accelerated aging sample, and the critical time for the effective content of the composite stabilizer to reach the critical criterion is obtained. According to the stability period prediction A method for quickly estimating working conditions and storage stability period of composite modified double-base propellant charge by estimating equation. Background technique [0002] The chemical stability of explosives refers to the ability of explosives to maintain their chemical properties under working conditions and storage conditions without exceeding...

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Problems solved by technology

[0004] Composite modified double-base propellant adopts thermal accelerated aging test to track the effective content of composite stabilizer to obtain the stability period, and commonly used chemical titration (chemical method in which bromine reacts with stabilizer to form bromide) or chromatography to determine the effective content of composite stabilizer As a destructive detection method, the effective content of the composite stabilizer of the pulverized sample is extracted by reflux of ether for 24 hours or longer, and the low boiling point solvent ether is flammable and explosive, and is prepared by mechanically pulverizing the composite modified double-base propellant aging sample The safety of the sample extracted with ether is poor, the operation is cumbersome, time-consuming, and the bromide produced by chemical titration will cause pollution

[0005] For the composite modified double-base propellant material, the law of the effective content of the composite stabilizer of the aging sample obtained by the thermally accelerated aging test at different temperatures, when the stability period is obtained by the Arrhenius equation, because the thermally accelerated aging test adopts at least 4 temperature 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 long Time, high temperature and thermal accelerated aging have a high risk, and it is difficult to meet the requirements of chemical stability design and evaluation in the development of new formulas and processes

[0006] For the composite modified double-base propellant charge with a certain size during the working condition and storage process, when the stability period is estimated, heat accumulation will occur during the heating process through the thermally accelerated aging test. On the one hand, it will lead to uneven distribution of the temperature field and cause The content distribution is not uniform. On the other hand, the multi-temperature point heat-accelerated aging test of composite modified double-base propellant charge is very easy to cause combustion and explosion accidents due to heat accumulation. The aging test at one temperature point and the use of chemical titration or chromatography to obtain the effective content of the compound stabilizer to determine the stable period cannot meet the needs of the compound modified double-base propellant charge and the needs of accurate evaluation of safety during storage.

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