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Preparation method of polymerized tannic acid coated high-activity aluminium powder/silicon powder

A tannic acid, high activity technology, used in offensive equipment, compressed gas generation, non-explosive/non-thermal agent components, etc. Abundance, low equipment requirements, and the effect of preventing agglomeration

Active Publication Date: 2019-12-10
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method requires high equipment, and the output is small, the efficiency is low, and there is still the problem of high cost, which is not suitable for industrial production and application

Method used

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  • Preparation method of polymerized tannic acid coated high-activity aluminium powder/silicon powder
  • Preparation method of polymerized tannic acid coated high-activity aluminium powder/silicon powder
  • Preparation method of polymerized tannic acid coated high-activity aluminium powder/silicon powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Dissolve 0.22g of Tris buffer reagent in 100mL of methanol / N,N-dimethylformamide solvent with a volume ratio of 1:1, adjust the pH to 8.5, then add 0.20g of tannic acid (TA), stir and dissolve evenly A tannic acid-buffer solution was obtained; then 0.10 g of nano-aluminum powder was added, stirred for 1 hour from the polymerization reaction, filtered and washed to obtain a nano-aluminum powder coated with polymerized tannic acid.

[0029] figure 2 with Figure 4 They are the SEM and TEM images of the nano-aluminum powder and the nano-aluminum powder coated with polymerized tannic acid prepared in this example, respectively. By comparison, it is found that the polymerized tannic acid has formed a uniform coating layer on the surface of the nano-aluminum powder. Image 6 It is the XRD pattern of nano-aluminum powder and the nano-aluminum powder coated with polymerized tannic acid prepared under the present embodiment. By comparison, it can be found that the aluminum pea...

Embodiment 2

[0031] Dissolve 0.22g of Tris buffer reagent in 100mL of methanol / N,N-dimethylformamide solvent with a volume ratio of 1:1, adjust the pH to 9.6, then add 0.20g of tannic acid (TA), stir and dissolve evenly A tannic acid-buffer solution was obtained; then 0.10 g of nano silicon powder was added, stirred for 6 hours from the polymerization reaction, filtered and washed to obtain nano silicon powder coated with polymerized tannic acid.

[0032] image 3 with Figure 5 The SEM and TEM photographs of the nano-silicon powder and the polymerized tannic acid-coated nano-silicon powder prepared in this example are the SEM and TEM photographs respectively. It is found by comparison that the polymerized tannic acid has formed a uniform coating layer on the surface of the nano-silicon powder. Figure 7 The XRD pattern of the nano-silicon powder and the polymerized tannic acid-coated nano-silicon powder prepared under this example is shown. By comparison, it can be found that the silicon...

Embodiment 3

[0034] Dissolve 0.22g of Tris buffer reagent in 100mL of methanol / N,N-dimethylformamide solvent with a volume ratio of 1:1, adjust the pH to 8.5, then add 0.20g of tannic acid (TA), stir and dissolve evenly A tannic acid-buffer solution was obtained; then 0.10 g of micron aluminum powder was added, stirred for 1 h from the polymerization reaction, filtered and washed to obtain micron aluminum powder coated with polymerized tannic acid.

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Abstract

The present invention discloses a preparation method of polymerized tannic acid coated high-activity aluminium powder / silicon powder. The method comprises the following steps: firstly, dissolving a buffer reagent in an organic solution, adding tannic acid, carrying out stirring for dissolving to obtain a tannic acid-buffer solution, then dispersing aluminum powder or silicon powder into the tannicacid-buffer solution, and carrying out stirring to carry out a self-polymerization reaction to obtain the polymerized tannic acid coated high-activity aluminium powder or silicon powder. The raw material of the preparation method is wide in resource and is green, environmentally friendly and safe, and the preparation method is simple and convenient and is suitable for industrial production. The aluminum or silicon@polymerized tannic acid core-shell-structure composite material prepared by the method can effectively prevent rapid oxidation of surfaces of aluminum / silicon particles and protectactivity of aluminum powder or silicon powder. When the aluminum or silcon@polymerized tannic acid core-shell-structure composite material is added into a solid propellant for high-temperature combustion, the coating polytannic acid is rich in carbon, and additional combustion heat can be provided, so that rapid combustion reactions of aluminum powder or silicon powder are promoted, and then combustion performance of the solid propellant is improved.

Description

technical field [0001] The invention belongs to the technical field of energetic materials, and relates to a preparation method of polymerized tannic acid-coated high-activity aluminum powder / silicon powder. Background technique [0002] Tannic acid is a plant polyphenolic compound that exists in natural plants (tea, wood, oak, etc.) and contains five dimethylol ester groups (Pan L, Wang H, Wu C, et al .Tannic-acid-coatedpolypropylene membrane as a separator for lithium-ion batteries[J].ACSapplied materials&interfaces,2015,7(29):16003-16010.). Similar to the polydopamine coating, the tannic acid coating can also be oxidized and self-polymerized to form polymerized tannic acid at room temperature, and the thickness of the generated polymerized tannic acid coating can be precisely controlled between one and tens of nanometers, which is A polymer coating material with stable performance at low temperature (SileikaT S, Barrett D G, Zhang R, et al.Colorless multifunctional coati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C06B33/00C06B45/32C06B23/00C06D5/06C08G65/38
CPCC06B23/007C06B33/00C06B45/32C06D5/06C08G65/38
Inventor 张文超陈亚杰吴刚刚俞春培王嘉鑫陈俊宏刘琦
Owner NANJING UNIV OF SCI & TECH
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