Method for preparing micro-nano explosive in liquid nitrogen by using ultrasonic technology

Abstract

The invention discloses a method for preparing a micro-nano explosive in liquid nitrogen by using ultrasonic technology. The method includes adding a single explosive to a reaction vessel filled withthe liquid nitrogen and conducting ultrasonic treatment to obtain a micro-nano explosive crystal after the liquid nitrogen is volatilized. A micro-nano energetic material is obtained by utilizing thecavitation physical effect of ultrasonic wave in the liquid nitrogen without addition of any organic or inorganic solvent, the whole preparation process is short, the post-processing procedures of filtering, washing and drying are omitted, and the whole process is more environmentally friendly.

Description

technical field

[0001] The invention belongs to the technical field of energetic material preparation, and in particular relates to a method for preparing micro-nano explosives in liquid nitrogen using ultrasonic technology. Background technique

[0002] Traditional energetic materials have been difficult to meet the stringent requirements of precise strike, high-efficiency damage and high survivability, and are facing severe challenges at this stage. In order to break through the limitations of traditional energetic materials, the research on the micro-nanoization of energetic materials has become one of the current research hotspots and has attracted extensive attention. Micro-nano energetic materials usually refer to ultrafine explosive powders with a particle size of about 10 μm. Due to their small particle size and large specific surface area, they produce many unique properties different from traditional energetic materials. They have high energy release rate, reliable...

Examples

Embodiment 1

[0026] First, TATB was preheated at high temperature in a vacuum oven for 4 hours, and the preheating temperature was 60°C. Then, at room temperature, 1 g of TATB was added into the reaction bottle, and then about 50 ml of liquid nitrogen was poured into it, and the ultrasonic horn of the ultrasonic pulverizer was immersed under the liquid nitrogen liquid surface. Adjust the power of the ultrasonic pulverizer to 1000W, the working frequency to 40KHz, the pulse: on: 10s; off: 0.5s, the amplitude: Amp, 40%, the time of ultrasonic wave in liquid nitrogen is 10min, stop the ultrasonic wave, and then wait for the liquid nitrogen to volatilize, Obtain micronized TATB explosive crystals, figure 1 For this example, TATB crystal particles were prepared by ultrasonic technology in liquid nitrogen. It can be seen from the figure that the average particle size of TATB crystal particles is 16 μm.

Embodiment 2

[0028] At room temperature, add 1g of HMX into the reaction bottle, then pour about 50ml of liquid nitrogen, and immerse the ultrasonic horn of the ultrasonic pulverizer under the liquid nitrogen liquid surface. Adjust the power of the ultrasonic pulverizer to 1000W, the working frequency to 30KHz, the pulse: on: 10s; off: 1s, the amplitude: Amp, 35%, the ultrasonic wave action time in liquid nitrogen is 8min, stop the ultrasonic wave, and then wait for the liquid nitrogen to volatilize, and get Micronized HMX explosive crystals. figure 2 For this example, HMX crystal particles were prepared by ultrasonic technology in liquid nitrogen. It can be seen from the figure that the average particle size of HMX crystal particles is 10 μm.

Embodiment 3

[0030] Firstly, DAAF was preheated at high temperature in a vacuum oven for 3.5 hours, and the preheating temperature was 55°C. At room temperature, add 1gDAAF into the reaction bottle, then pour about 50ml of liquid nitrogen, and immerse the ultrasonic horn of the ultrasonic pulverizer under the liquid nitrogen liquid surface. Adjust the power of the ultrasonic pulverizer to 1000W, the working frequency to 40KHz, the pulse: on: 10s; off: 1s, the amplitude: Amp, 20%, the ultrasonic wave action time in liquid nitrogen is 10min, stop the ultrasonic wave, and then wait for the liquid nitrogen to volatilize, and get Micronized DAAF explosive crystals. image 3 For this example, DAAF crystal particles were prepared by ultrasonic technology in liquid nitrogen. It can be seen from the figure that the average particle size of DAAF crystal particles is 9 μm.

technical field

[0001] The invention belongs to the technical field of energetic material preparation, and in particular relates to a method for preparing micro-nano explosives in liquid nitrogen using ultrasonic technology. Background technique

[0002] Traditional energetic materials have been difficult to meet the stringent requirements of precise strike, high-efficiency damage and high survivability, and are facing severe challenges at this stage. In order to break through the limitations of traditional energetic materials, the research on the micro-nanoization of energetic materials has become one of the current research hotspots and has attracted extensive attention. Micro-nano energetic materials usually refer to ultrafine explosive powders with a particle size of about 10 μm. Due to their small particle size and large specific surface area, they produce many unique properties different from traditional energetic materials. They have high energy release rate, reliable...

Examples

Embodiment 1

[0026] First, TATB was preheated at high temperature in a vacuum oven for 4 hours, and the preheating temperature was 60°C. Then, at room temperature, 1 g of TATB was added into the reaction bottle, and then about 50 ml of liquid nitrogen was poured into it, and the ultrasonic horn of the ultrasonic pulverizer was immersed under the liquid nitrogen liquid surface. Adjust the power of the ultrasonic pulverizer to 1000W, the working frequency to 40KHz, the pulse: on: 10s; off: 0.5s, the amplitude: Amp, 40%, the time of ultrasonic wave in liquid nitrogen is 10min, stop the ultrasonic wave, and then wait for the liquid nitrogen to volatilize, Obtain micronized TATB explosive crystals, figure 1 For this example, TATB crystal particles were prepared by ultrasonic technology in liquid nitrogen. It can be seen from the figure that the average particle size of TATB crystal particles is 16 μm.

Embodiment 2

[0028] At room temperature, add 1g of HMX into the reaction bottle, then pour about 50ml of liquid nitrogen, and immerse the ultrasonic horn of the ultrasonic pulverizer under the liquid nitrogen liquid surface. Adjust the power of the ultrasonic pulverizer to 1000W, the working frequency to 30KHz, the pulse: on: 10s; off: 1s, the amplitude: Amp, 35%, the ultrasonic wave action time in liquid nitrogen is 8min, stop the ultrasonic wave, and then wait for the liquid nitrogen to volatilize, and get Micronized HMX explosive crystals. figure 2 For this example, HMX crystal particles were prepared by ultrasonic technology in liquid nitrogen. It can be seen from the figure that the average particle size of HMX crystal particles is 10 μm.

Embodiment 3

[0030] Firstly, DAAF was preheated at high temperature in a vacuum oven for 3.5 hours, and the preheating temperature was 55°C. At room temperature, add 1gDAAF into the reaction bottle, then pour about 50ml of liquid nitrogen, and immerse the ultrasonic horn of the ultrasonic pulverizer under the liquid nitrogen liquid surface. Adjust the power of the ultrasonic pulverizer to 1000W, the working frequency to 40KHz, the pulse: on: 10s; off: 1s, the amplitude: Amp, 20%, the ultrasonic wave action time in liquid nitrogen is 10min, stop the ultrasonic wave, and then wait for the liquid nitrogen to volatilize, and get Micronized DAAF explosive crystals. image 3 For this example, DAAF crystal particles were prepared by ultrasonic technology in liquid nitrogen. It can be seen from the figure that the average particle size of DAAF crystal particles is 9 μm.

Images