Method for preparing superhydrophobic oxidant based on lotus leaf effect

A lotus leaf effect and oxidant technology, applied in the field of anti-moisture absorption, can solve the problems of few reports on energetic materials, affect the performance of use, reduce hygroscopicity, etc., achieve the effect of small proportion, lower thermal decomposition temperature, and high product quality

Active Publication Date: 2021-03-09
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used oxidants are ammonium perchlorate (AP), ammonium dinitramide (ADN) and ammonium nitrate (AN). There is a common disadvantage: it is extremely hygroscopic during preparation, production, storage, propellant casting, etc., which affects its performance. Therefore, these oxidants need to be modified before application to reduce their hygroscopicity.
Superhydrophobic technology is a bionic technology developed by simulating the surface structure of lotus leaves in the past ten years. There are few reports on the anti-moisture absorption of energetic materials

Method used

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  • Method for preparing superhydrophobic oxidant based on lotus leaf effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for preparing superhydrophobic oxidant based on the lotus leaf effect, comprising the following steps:

[0026] Step 1, dissolving 1g of myristic acid in ethyl acetate to form a solution with a mass concentration of 2%, adding 50g of ammonium perchlorate solid particles, stirring for 30 minutes, filtering and drying for later use;

[0027] Step 2: dissolving 0.5 g of copper chloride into ethyl acetate to form a solution with a concentration of 1%, adding the dried solid in step 1, stirring for 20 minutes, filtering and drying to obtain superhydrophobic oxidant particles.

Embodiment 2

[0029]A method for preparing superhydrophobic oxidant based on the lotus leaf effect, comprising the following steps:

[0030] Step 1, dissolving 1 g of heptadecanoic acid in ethyl acetate to form a solution with a mass concentration of 3%, adding 50 g of ammonium perchlorate solid particles, stirring for 30 minutes, filtering and drying for later use;

[0031] Step 2: dissolving 0.5 g of silver nitrate into ethyl acetate to form a solution with a concentration of 1%, adding the dried solid in step 1, stirring for 20 minutes, filtering and drying to obtain superhydrophobic oxidant particles.

Embodiment 3

[0033] A method for preparing superhydrophobic oxidant based on the lotus leaf effect, comprising the following steps:

[0034] Step 1, dissolving 1g of vinyltriethoxysilane in dichloroethane to prepare a solution with a mass concentration of 1%, adding 50g of ammonium dinitramide solid particles, stirring for 10 minutes, filtering and drying to obtain the finished product;

[0035] Step 2: dissolving 0.5 g of ferric nitrate into ethyl acetate to form a solution with a concentration of 1%, adding the dried solid in step 1, stirring for 20 minutes, filtering and drying to obtain superhydrophobic oxidant particles.

[0036] The hygroscopicity test (adopting GJB770A-97 standard) is carried out to the untreated ammonium dinitramide crystal and the superhydrophobic spherical ammonium dinitramide prepared, and the hygroscopic rate of the untreated ammonium dinitramide crystal is 68%; This embodiment obtains The moisture absorption rate of the superhydrophobic oxidant particles is 15...

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Abstract

The invention discloses a method for preparing a super-hydrophobic oxidant based on lotus leaf effect, comprising: adding a low surface energy material into a solvent, then adding oxidant particles, stirring, filtering and drying; Add it into the metal salt solution, filter and dry it after fully reacting to obtain super-hydrophobic oxidant particles. The invention uses the bionic super-hydrophobic principle to perform surface treatment on the hygroscopic oxidant, so that the moisture absorption rate is obviously reduced, especially under the conditions of a temperature of 60° C., a relative humidity of 80% and a test time of 400 hours, the moisture absorption rate of ADN is reduced. About 53%, it can be placed in the air for 6 months without agglomeration. The used coating material can achieve the anti-hygroscopic performance of the oxidant, and the metal salt in it can significantly reduce the thermal decomposition temperature of the oxidant. The application in high burning rate solid propellants is very interesting.

Description

technical field [0001] The invention belongs to the anti-hygroscopic technology of hygroscopic inorganic oxidants, in particular to a method for preparing superhydrophobic oxidants based on the lotus leaf effect. Background technique [0002] Aviation and aerospace technology is the most active and influential science and technology in the process of human understanding and transformation of nature, and it is also an important symbol of the high development of human civilization. Composite solid propellant is the most commonly used energy material in aerospace, and its main components are oxidizer and combustible agent. At present, the commonly used oxidants are ammonium perchlorate (AP), ammonium dinitramide (ADN) and ammonium nitrate (AN). There is a common disadvantage: it is extremely hygroscopic during preparation, production, storage, propellant casting, etc., which affects its performance. Therefore, these oxidants need to be modified before application to reduce the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C06B29/22C06B31/28C06B43/00C06B45/32C06B21/00C06B23/00
CPCC06B21/0083C06B23/009C06B29/22C06B31/28C06B43/00C06B45/32
Inventor 郭长平许鹏飞王敦举王瑞浩冀威田璐杨光成
Owner SOUTHWEAT UNIV OF SCI & TECH
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