Preparation method of Al/PVDF microspheres

A technology of microspheres and powders, applied in the field of preparing Al/PVDF microspheres, which can solve the problems of easy agglomeration of samples, complicated operation, long production cycle, etc., and achieve the effect of uniform distribution of components, simple equipment and easy operation

Inactive Publication Date: 2021-10-22
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are many methods to prepare nano thermite, such as ultrasonic physical mixing method (prepared samples are easy to agglomerate and unevenly dispersed), sol-gel method (long production cycle, complicated operation and introducing impurities), self-assembly (preparation The process is complicated, the cost is high and the yield is low), etc.

Method used

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  • Preparation method of Al/PVDF microspheres
  • Preparation method of Al/PVDF microspheres
  • Preparation method of Al/PVDF microspheres

Examples

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preparation example Construction

[0025] The present invention is a kind of preparation method of Al / PVDF microsphere, concrete steps are as follows:

[0026] The first step is to weigh an appropriate amount of PVDF, and then dissolve PVDF in an appropriate amount of DMF and acetone mixed solvent, the volume ratio of DMF and acetone is 1:4. Stir ultrasonically to fully dissolve PVDF to obtain a PVDF solution at a stirring speed of 650-800 rpm for 2-5 minutes;

[0027] The second step is to weigh an appropriate amount of nano-aluminum powder, add it to the PVDF solution, first magnetically stir for 5-10 minutes, and then sonicate for 0.5-1h to obtain a nano-aluminum powder PVDF dispersion, and then magnetically stir for 20-24 hours to obtain an electrostatic spray precursor The stirring speed is 650-800 rpm. During the ultrasonic process, the temperature of the water in the ultrasonic instrument should be prevented from being too high. The water should be changed every 5-10 minutes. In winter, the water change ...

Embodiment 1

[0031] The first step is to weigh 6 mg of PVDF powder, add the powder to 1 mL of DMF: acetone = 1:4 (volume ratio) solvent, place it on a magnetic stirrer at 750 rpm and stir for 2 min, then sonicate to PVDF Completely dissolve to obtain PVDF solution;

[0032] In the second step, 194 mg of nano-aluminum powder (active aluminum content = 82.1%) was weighed, and n-Al was added to the PVDF solution, first placed on a magnetic stirrer at 650 rpm for 5 min, and then ultrasonically dispersed for 1 h. Then place it on a magnetic stirrer at 650 rpm and stir for 24 h to obtain the electrostatic spray precursor;

[0033] The third step is to use a 10 mL syringe to absorb the precursor solution, place it on the bolus of the electrostatic spray, place the aluminum foil base, the distance from the needle to the aluminum foil is 10 cm, connect the power supply, the needle is connected to the positive, the aluminum foil is connected to the negative, and the voltage is 19 (±0.25) kV, open t...

Embodiment 2

[0036] The first step is to weigh 20 mg of PVDF powder, add the powder to 1 mL of DMF: acetone = 1:4 (volume ratio) solvent, place it on a magnetic stirrer at 800 rpm and stir for 2 min, then sonicate until PVDF is completely Dissolve to obtain PVDF solution;

[0037] In the second step, 180 mg of nano-aluminum powder (active aluminum content = 82.1%) was weighed, and n-Al was added to the PVDF solution, first placed on a magnetic stirrer at 650 rpm for 5 min, and then ultrasonically dispersed for 1 h. Then place it on a magnetic stirrer at 650 rpm and stir for 24 h to obtain the electrostatic spray precursor;

[0038] The third step is to use a 10 mL syringe to absorb the precursor solution, place it on the bolus of the electrostatic spray, place the aluminum foil base, the distance from the needle to the aluminum foil is 10 cm, connect the power supply, the needle is connected to the positive, the aluminum foil is connected to the negative, and the voltage is 19 (±0.25) kV,...

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Abstract

The invention discloses a preparation method of Al / PVDF microspheres, wherein a precursor solution is prepared by taking nano aluminum powder and PVDF powder as mixed powder based on an electrostatic spraying principle, and the precursor solution is sprayed and deposited on a substrate at a certain propelling speed under the action of a high-voltage electric field. Thus, the Al / PVDF microspheres obtained through the method are uniform in component distribution, wherein the Al and PVDF are tightly combined. The method is simple in equipment and easy to operate, the uniform microspheres can be prepared in one step, and production can be carried out at normal temperature and normal pressure without special conditions.

Description

technical field [0001] The invention relates to a method for preparing Al / PVDF microspheres, which belongs to the field of preparation of energetic materials. Background technique [0002] Energetic materials (EMs) are a class of materials that store a large amount of chemical energy and can be released quickly, mainly including explosives, pyrotechnics, and propellants. Nano-thermite is a new type of energetic material, which is mainly composed of nano-scale oxidizing agent and reducing agent, and generates high temperature and a large amount of heat during the reaction. However, there are also some problems with nano-thermite, such as a layer of oxide layer on the surface of nano-aluminum powder, and problems such as easy agglomeration of nano-aluminum powder, which limit the application of nano-aluminum powder; A series of studies have been carried out in terms of material composition and so on. Among them, the energy density of fluorine-containing aluminum fuel oxidati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C06B33/02C06B23/00
CPCC06B33/02C06B23/001C06B23/00
Inventor 姜炜赵璐佳柯香郝嘎子胡玉冰肖磊张光普郭虎宁可
Owner NANJING UNIV OF SCI & TECH
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