CN-117491588-B - Determination method of critical water content of explosive material

CN117491588BCN 117491588 BCN117491588 BCN 117491588BCN-117491588-B

Abstract

The invention discloses a method for determining critical water content of explosive materials, which comprises the steps of obtaining explosive materials with different water contents, determining the water content, researching thermal decomposition characteristics, determining a thermal explosion experiment water content interval, obtaining isothermal delay of the explosive materials with a certain water content through a thermal explosion experiment, obtaining isothermal delay of the explosive materials with different water contents, analyzing the relationship between the isothermal delay and the water content, and determining the critical water content of the explosive materials. The method can obtain the critical water content of the explosive material with a certain size, and has more guiding significance for the explosive safety engineering application.

Inventors

ZHOU JINGJING
ZHU YANLONG
HUANG MENG
LI ZIHAN
AN JING
HUA DONG
ZHOU JING

Assignees

西安近代化学研究所

Dates

Publication Date: 20260505
Application Date: 20231009

Claims (1)

1. A method for determining critical water content of explosive materials is characterized by comprising the following steps: step one, obtaining explosive materials with different water contents and determining the water content Obtaining the water content of the explosive material by an oven method, calculating the water content value of the explosive material according to the water content formula of the formula (1), and recording; (1) In the formula (1), W is the water content of the explosive material in percent, m 1 is the sum of the mass of the explosive material sample before drying and the mass of the container in g, m 2 is the sum of the mass of the explosive material sample after drying and the mass of the container in g, and m is the mass of the dry explosive material sample in g; step two, researching thermal decomposition characteristics and determining a water content interval of a thermal explosion experiment Rapidly obtaining and recording thermal decomposition characteristic values of the explosive materials with different water contents by a differential scanning calorimetry, analyzing the law of the thermal decomposition characteristics of the explosive materials along with the change of the water contents, and determining the water content change range of the explosive materials for carrying out a thermal explosion experiment; step three, isothermal retardation of the explosive material with certain water content is obtained through thermal explosion experiments According to the water content variation range determined in the second step, selecting the explosive material with a certain water content obtained in the first step, filling the explosive material into an aluminum cylindrical semi-sealed container with a certain size, and carrying out experiments by adopting an explosive thermal stability test device under isothermal conditions, and testing and recording isothermal delay of the explosive material; Step four, repeating the step three according to the water content interval determined in the step two to obtain isothermal retardation of the explosive materials with different water contents; Analyzing the relationship between isothermal delay and water content to determine critical water content of explosive material And (3) according to the result obtained in the step (IV), drawing by taking the water content as an abscissa and the isothermal retardation as an ordinate, obtaining a curve of the isothermal retardation changing along with the water content, fitting the curve, selecting points corresponding to the minimum and maximum values of the water content as tangents, and taking the water content corresponding to the intersection point of the two tangents as the critical water content.

Description

Determination method of critical water content of explosive material Technical Field The invention belongs to the technical field of explosives and powders, mainly relates to the study of the thermal stability of simple substances of explosives and powders and materials, and particularly relates to a determination method of critical water content of the explosives and powders. Background In the synthetic production process of the explosives and powders, the thermal stability of the explosives and powders and the materials thereof can be affected by the water content, particularly, the high-energy high-activity materials are subjected to the processes of drying, calendaring, screw pressing, water driving and the like, the hydrous explosives and powders and the materials thereof interact with water under the external thermal stimulus, meanwhile, the moisture can change the internal thermal conduction of the materials, the hydrous materials can be decomposed in advance under the thermal stimulus, unexpected combustion or explosion is caused in serious cases, in addition, the water content is increased to a certain extent, after the water content is increased, the decomposition of the materials can be inhibited, namely, the critical water content exists in the research process of the thermal stability of the explosives and powders, and the thermal stability of the explosives and powders is affected by the water content to the greatest extent. Therefore, the research of critical water content is of great significance in the field of the research of the thermal stability of the explosives and powders and the safety production. The prior research work generally adopts an initial decomposition temperature or a delay period to determine the critical water content of the explosive material. At present, the problems are that (1) the prior method generally adopts a differential scanning calorimetric technique or a micro-thermal technique to determine the initial decomposition temperature of the explosive materials with different water contents, the sampling quantity is generally milligram-scale, the sampling is uneven, and especially for the materials with mixed components, the erroneous judgment on the experimental result is easy to be caused, the influence rule of the actual water content on the temperature delay time cannot be obtained, and (2) the physical and chemical performance analysis can be carried out on milligram-scale samples relative to the materials in the explosive process, but the representativeness of milligram-scale samples is poor, and the influence of the size effect on the critical water content cannot be studied. Disclosure of Invention The invention aims to solve the technical problems that the differential scanning calorimetric technique or the micro-calorimetric technique is uneven in milligram-scale sampling, which is easy to cause misjudgment of results, unclear in regular research, incapable of carrying out size effect analysis and the like. In order to achieve the above task, the present invention adopts the following technical solutions: a method for determining critical water content of explosive materials is characterized by comprising the following steps: step one, obtaining explosive materials with different water contents and determining the water content Obtaining the water content of the explosive material by an oven method, calculating the water content value of the explosive material according to the water content formula of the formula (1), and recording; In the formula (1), W is the water content (%) of the explosive material, m 1 is the sum (g) of the mass of the explosive material sample before drying and the mass of the container, m 2 is the sum (g) of the mass of the explosive material sample after drying and the mass of the container, and m is the mass (g) of the dry explosive material sample; step two, researching thermal decomposition characteristics and determining a water content interval of a thermal explosion experiment Rapidly obtaining and recording thermal decomposition characteristic values of the explosive materials with different water contents by a differential scanning calorimetry, analyzing the law of the thermal decomposition characteristics of the explosive materials along with the change of the water contents, and determining the water content change range of the explosive materials for carrying out a thermal explosion experiment; step three, isothermal retardation of the explosive material with certain water content is obtained through thermal explosion experiments According to the water content variation range determined in the second step, selecting the explosive material with a certain water content obtained in the first step, filling the explosive material into an aluminum cylindrical semi-sealed container with a certain size, and carrying out experiments by adopting an explosive thermal stability test device under isothermal conditions, and testing