Rapid estimation method of double-base propellant charge safety period

Abstract

A method for fast pre-estimating a charging stabilization period of a double-base propellant comprises: using a thermal accelerated aging method to prepare a No.II centralite effective content near infrared quantitative model modeling sample; collecting spectra through a near infrared diffuse reflection spectrometer and establishing a No.II centralite effective content near infrared quantitative model; establishing a stabilization period pre-estimating equation by using a reliable temperature coefficient r0; tracking and detecting the effective content of a No.II centralite in a single-temperature charging thermal accelerated aging process through a near infrared method; obtaining a critical time used when the effective content reaches a critical criterion; and extrapolating the charging stabilization period of the double-base propellant through the stabilization period pre-estimating equation at the working condition and storage environment temperature. According to the method, the stabilization period is obtained through lossless tracking of effective contents of a charging sample at one temperature at different aging times in a near infrared method, and the sample amount is reduced by 96%. The method is safe and is low in cost.

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, it uses near-infrared diffuse reflectance spectroscopy to detect the effective content of the fixed agent in the single-temperature heat-accelerated aging sample of double-base propellant (ST), and obtains the time consumed by the effective content of the fixed agent in No. Ⅱ to reach the critical criterion. , a method for quickly predicting the safety period of double-base propellant charges under operating conditions and storage ambient temperature according to the stability period estimation 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 the allowable range so as to cau...

AI Technical Summary

Problems solved by technology

[0005] Double-based propellant adopts the method of thermally accelerated aging test to track the effective content of No. Ⅱ neutralizer to obtain the stable period. The chemical titration method (chemical method in which bromine reacts with stabilizer to form bromide) or high performance liquid chromatography is commonly used to determine No. 2 neutralizer. To determine the effective content of the fixed agent, use ether to reflux for 24 hours or even longer to extract the effective content of the crushed sample No. Ⅱ, the effective content of the fixed agent, the low boiling point solvent ether is flammable and explosive, and prepare the ether extraction by mechanically pulverizing the aging sample of the double base propellant Poor safety when using samples, cumbersome and time-consuming operation, and bromide produced by chemical titration brings pollution

The change law of the effective content of the aging sample No. Ⅱ in the aging sample No. II at different temperatures obtained through the thermally accelerated aging test. 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 has a high risk of accelerated aging under high temperature for a long time , it is difficult to meet the requirements of chemical stability design and evaluation in new formula development and process

[0006] For the double-base propellant charge with a certain size in 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 uneven distribution of stabilizer content. On the other hand, double-base propellant charges are prone to combustion and explosion accidents due to heat accumulation in multi-temperature point heat-accelerated aging tests. Or high performance liquid chromatography to determine the stable period of stabilizer content, it is difficult to meet the needs of chemical stability evaluation in the storage process of double-base propellant charge

Images