A rapid estimation method for the safety period of stacked three-base propellant

Abstract

The invention discloses a quick estimation method for an ultimate stage of stacked triple-base propellants. The method comprises the steps of preparing a modeling sample of a No. II centralite active content near infrared quantitative model of the triple-base propellants by using a thermal accelerated aging method, collecting near infrared spectra, and establishing the No. II centralite active content near infrared quantitative model via chemometrics; establishing an ultimate-stage estimation equation by using a reliable temperature coefficient r0; tracking and detecting the active content of a No. II centralite in the thermal accelerated aging process of the stacked triple-base propellants by adopting a near infrared method, obtaining a critical time determined when the active content is critical, and extrapolating the ultimate stage of the stacked propellants under the working condition and the storage environment temperature according to an ultimate stage estimation equation. By adopting the method, the ultimate stage can be obtained only by non-destructively tracking the active content of one propellant sample at one temperature at different aging time via the near infrared method, so that the quantity of samples is reduced by 96%, and the method is quick, safe and low in cost.

Description

technical field [0001] The invention belongs to the technical field of safety evaluation of propellants and explosives, and relates to a method for rapidly predicting the working conditions and stability period of propellants and explosives in the storage process, in particular to a single-temperature heat-accelerated aging method for detection of stacked three-base propellants by using near-infrared diffuse reflectance spectroscopy The effective content of sample No. Ⅱ medium fixed agent is obtained, and the critical time for the effective content of No. Ⅱ medium fixed agent to reach the critical criterion is obtained, and the safety period of the accumulated three-base propellant under the storage environment temperature is quickly estimated according to the safety period estimation equation. method. Background technique [0002] The chemical stability of explosives refers to the ability of explosives to maintain their chemical properties under working conditions and stora...

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Problems solved by technology

[0005] The three-base propellant adopts the method of thermally accelerated aging test to track the effective content of No. Ⅱ neutralizer to obtain the stable period, and the commonly used chemical titration method (chemical method in which bromine reacts with stabilizer to form bromide) or chromatography is used to determine the effectiveness of No. 2 neutralizer. content, use diethyl ether to reflux for 24 hours or even longer to extract the effective stabilizer of the pulverized sample, the low boiling point solvent diethyl ether is flammable and explosive, and the safety is poor when preparing the diethyl ether extraction sample by mechanically pulverizing the aging sample of the three-base propellant, The operation is cumbersome, time-consuming and polluted by bromide produced by chemical titration

[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 thermal accelerated aging test, when the stability period is obtained by the Arrhenius equation, since the 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. The risk of accelerated aging is high, and it is difficult to meet the requirements of chemical stability design and evaluation in the development of new formulas and processes

[0007] When predicting the stability period of a three-base propellant with a certain stack size (accumulated three-base propellant) in the working condition and storage process, heat accumulation will occur during the heating process of the thermally accelerated aging test. On the one hand, it will lead to uneven distribution of the temperature field, causing stability On the other hand, it is very easy to cause combustion and explosion accidents due to heat accumulation in the multi-temperature point heat-accelerated aging test of accumulated propellants. Chromatographic method to determine the stable period of stabilizer content can not meet the needs of accumulating propellant powder working conditions and accurate evaluation of safety during storage

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