Method for preparing superhydrophobic oxidant based on lotus effect

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

Active Publication Date: 2019-01-15
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 effect

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Experimental program
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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 superhydrophobic oxidant based on lotus effect. The method comprises the following steps: adding a low-surface-energy material into a solvent, then adding oxidant particles, and carrying out stirring, filtering and drying successively; and adding the oxidant particles modified by the low-surface-energy material into a metal salt solution, and carrying out filtering and drying after a sufficient reaction so as to obtain superhydrophobic oxidant particles. According to the invention, the principles of bionic superhydrophobicity are employed for surface treatment of the oxidant prone to moisture absorption, so the moisture absorption rate of the oxidant is significantly reduced, and in particular, under the conditions of a temperature of 60 DEGC, a relative humidity of 80% and test time of 400 hours, the moisture absorption rate of ADN is lowered by about 53%, and the superhydrophobic oxidant can be placed in the air for 6 months without any agglomeration; and an utilized coating material assists in the realization of moisture absorption prevention performance of the oxidant, and a metal salt in the coating material can significantly reduce the thermal decomposition temperature of the oxidant, which is of important significance to the application of the oxidant to high-burning-rate solid propellants.

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 Applications(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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