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Preparation method of ammonium perchlorate standard samples with different water contents

A technology of ammonium perchlorate and standard samples, which is applied in the field of preparation of ammonium perchlorate standard samples, can solve problems such as the decrease in accuracy of terahertz spectrum detection, and achieve high porosity, uniform water distribution, and stable terahertz spectrum Effect

Active Publication Date: 2021-04-20
SOUTHWEAT UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The uniform distribution of water in the ammonium perchlorate standard sample is the key to ensure the detection results of terahertz spectroscopy. If the water in the sample is not uniform, the accuracy of terahertz spectroscopy will be greatly reduced.

Method used

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  • Preparation method of ammonium perchlorate standard samples with different water contents
  • Preparation method of ammonium perchlorate standard samples with different water contents
  • Preparation method of ammonium perchlorate standard samples with different water contents

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preparation example Construction

[0040] The invention provides a kind of preparation method of the ammonium perchlorate standard sample of different moisture content, comprises the following steps:

[0041] (1) providing a moisture content is the ammonium perchlorate standard sample of the low moisture content of 1~2wt%, comprises the following steps:

[0042] (a) Spread the absolute dry ammonium perchlorate powder in the sample box body, and perform mechanical pressing to obtain ammonium perchlorate flakes.

[0043] In the present invention, the material of the sample box body and cover is preferably polytetrafluoroethylene. The absorption coefficient of polytetrafluoroethylene material is lower than that of other materials (such as acrylic, polystyrene, polypropylene or polyvinyl chloride), and there is no obvious absorption peak, which is more conducive to the detection of ammonium perchlorate moisture by terahertz spectroscopy.

[0044] In the present invention, the inner diameter of the sample cartridge...

Embodiment 1

[0095] (1) the preparation of ammonium perchlorate moisture content is a standard sample of 1wt%

[0096] (1) Get 6g of dry ammonium perchlorate powder with a particle size of 5-34 μm and a purity of 99.5%, spread it flat in the Teflon sample box body, the inner diameter of the sample box body is 40mm, and the depth is 5mm, use 4 tons of tablet presses to compress 4min, obtain ammonium perchlorate flakes;

[0097] (2) Spray water mist into the ammonium perchlorate flakes so that the total mass of the sample box body and aqueous ammonium perchlorate is higher than the set total mass, cover the sample box cover, and let it stand for 10 hours.

[0098] The absorption coefficient spectrum and refraction spectrum of the PTFE sample box in the terahertz band are as follows: figure 1 As shown, its absorption coefficient in the terahertz band is low, and there is no obvious absorption peak, and it can be used for the detection of ammonium perchlorate moisture by terahertz spectroscop...

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Abstract

The invention provides a preparation method of ammonium perchlorate standard samples with different water contents, and belongs to the technical field of standard sample preparation. According to the method, the relationship between the porosity and the moisture content of the ammonium perchlorate powder is fully considered, the ammonium perchlorate standard sample is prepared by adopting different modes according to different moisture contents, and the moisture with different contents can be uniformly distributed in pores of the ammonium perchlorate powder. Meanwhile, the influence of standing time on moisture diffusion is fully considered, uniform diffusion of moisture among pores of the ammonium perchlorate powder can be ensured by limiting the standing time in the preparation process of the ammonium perchlorate standard samples with different moisture contents, and the moisture distribution in the obtained ammonium perchlorate standard samples is uniform.

Description

technical field [0001] The invention relates to the technical field of standard sample preparation, in particular to a method for preparing ammonium perchlorate standard samples with different water contents. Background technique [0002] Ammonium perchlorate (AP) has the advantages of high effective oxygen content, no heavy metal ions, good process performance, high thermal stability and chemical stability, and is widely used as pyrotechnics, blasting explosives, solid Oxidizers for energetic materials such as rocket propellants. Studies have shown that moisture will adversely affect the combustion energy release, combustion speed, mechanical properties and mechanical sensitivity of energetic materials. Therefore, in "GJB 617A-2003 Ammonium Perchlorate", it is stipulated that the moisture content of AP is a must-test item and technical index for products leaving the factory, and its moisture content needs to be ≤0.05%. [0003] At present, the methods for detecting the wa...

Claims

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Application Information

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IPC IPC(8): G01N21/3563G01N21/3581
Inventor 邓琥尚丽平苗建波熊中刚杨洁萍武志翔熊亮屈薇薇李占锋何俊
Owner SOUTHWEAT UNIV OF SCI & TECH
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