Vacuum freeze-drying process for superfine nitramine explosive slurry

A technology of vacuum freeze-drying and nitramine explosives, applied in the direction of design optimization/simulation, calculation, computer-aided design, etc., can solve the problems of low drying efficiency, high temperature, hidden dangers, etc. The effect of shortening the time

Inactive Publication Date: 2021-06-01
NANJING UNIV OF SCI & TECH
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Problems solved by technology

Both water-bath drying and vacuum drying remove the solvent in the wet material by evaporation, which belongs to static drying. During the drying process, due to the action of liquid surface tension and capillary force, particles will gradually gather to form new bonds, resulting in agglomeration. Affect the performance of the sample; spray drying is a drying method that uses an atomizer to disperse the raw material liquid into droplets, and uses hot air to dry the droplets to obtain powdery or spherical samples. There are certain safety hazards; supercritical fluid drying is to place the sample in a supercritical state. At this time, there is no gas-liquid interface, so there will be no interfacial tension and avoid particle agglomeration. However, due to the large inve

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  • Vacuum freeze-drying process for superfine nitramine explosive slurry
  • Vacuum freeze-drying process for superfine nitramine explosive slurry
  • Vacuum freeze-drying process for superfine nitramine explosive slurry

Examples

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Example Embodiment

[0039] Example 1

[0040]The first step is to select the main influencing factors of the ultrafine CL-20 slurry vacuum freeze-drying process: sample thickness, vacuum degree, and the mass ratio of ethanol / water in the mixed solvent as variables, and determine the factor parameter level and coding table, as shown in Table 1. According to the factor levels in Table 1, mixed solvents with different ethanol / water mass ratios were prepared respectively, wherein the ethanol / water mass ratios were 0.2 or 0.4 respectively, and the mass ratio of ultrafine CL-20 particles and mixed solvents was 1:10. Ratio preparation of ultra-fine CL-20 slurry under different solvent ratios;

[0041] In the second step, the average drying rate of ultrafine CL-20 slurry is selected as the response value, and the optimization experiment is carried out according to the response surface experimental design method, as shown in Table 2. The specific experimental method is as follows: according to the experi...

Example Embodiment

[0047] Example 2

[0048] The first step is to select the main influencing factors of the vacuum freeze-drying process of ultrafine HMX slurry: sample thickness, vacuum degree, and the mass ratio of ethanol / water in the mixed solvent as variables, and determine the factor parameter level and coding table, as shown in Table 1. Prepare mixed solvents with different ethanol / water mass ratios according to the factor levels in Table 1, wherein the mass ratio of ethanol / water is 0.2 or 0.4, and prepare different solvent ratios according to the mass ratio of ultrafine HMX particles and mixed solvents as 1:10 Ultrafine HMX slurry under;

[0049] In the second step, the average drying rate of ultrafine HMX slurry is selected as the response value, and the optimization experiment is carried out according to the response surface experimental design method, as shown in Table 4. The specific experimental method is as follows: according to the experimental plan in Table 4, put the uniforml...

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Abstract

The invention discloses a vacuum freeze-drying process for superfine nitramine explosive slurry, which comprises the following steps: preparing precursor slurry from superfine nitramine explosive particles and an ethanol/water mixed solvent, freezing the precursor slurry, and drying in a vacuum freeze-drying bin; and selecting three main influence factors of sample thickness, vacuum degree and ethanol/water mass ratio in a mixed solvent as variables, selecting the average drying rate of the superfine nitramine explosive slurry as a response value, and optimizing the drying process through a response surface experiment, so that the optimized vacuum freeze drying process of the superfine nitramine explosive slurry can shorten the drying time, meanwhile, the dried superfine nitramine explosive particles are loose, free of agglomeration, low in mechanical sensitivity and high in safety.

Description

technical field [0001] The invention relates to a drying process for vacuum freezing of superfine nitramine explosive slurry, which belongs to the field of preparation technology of superfine materials. Background technique [0002] Nitramine explosives (RDX, Octogen (HMX), Hexanitrohexaazaisowurtzitane (CL-20)) are a type of high energy density single-substance explosives. Thermal, detonation velocity and detonation pressure properties, widely used in mixed explosives and solid propellants. However, industrially synthesized nitramine explosives usually have irregular polyhedral morphology and a wide range of particle size distribution, which leads to poor process performance and high sensitivity to friction, impact and shock waves, which brings difficulties to production, storage and transportation. big security risk. Ultrafine is considered to be one of the most effective methods to reduce the sensitivity of nitramine explosives. In recent years, the mechanical ball mill...

Claims

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Application Information

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IPC IPC(8): G06F30/20G06F119/08
CPCG06F30/20G06F2119/08
Inventor 姜炜张黎明肖磊郝嘎子宗胡曾胡玉冰张光普
Owner NANJING UNIV OF SCI & TECH
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