Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Hollow ultrafine ammonium perchlorate and preparation method thereof

A technology of ammonium perchlorate and ammonium chlorate, which is applied in the direction of perchloric acid and perchlorate, can solve the problems of being unable to prepare hollow ultrafine ammonium perchlorate materials, and achieve good dispersion and regularity, Easy operation and uniform particle size

Inactive Publication Date: 2012-10-10
NANJING NORMAL UNIVERSITY +1
View PDF4 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above methods all couple or integrate the anti-solvent-recrystallization method with other methods to prepare ultrafine materials, but none of the above methods can prepare hollow ultrafine ammonium perchlorate materials

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Hollow ultrafine ammonium perchlorate and preparation method thereof
  • Hollow ultrafine ammonium perchlorate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Hollow superfine ammonium perchlorate and preparation method thereof, the steps are as follows:

[0028] First, at room temperature, take a certain amount of spherical ammonium perchlorate with a size of about 250 μm and dissolve it in an equal volume of N,N-dimethylformamide (DMF) / acetone mixed solvent to make perchloric acid ammonium saturated solution; then add 10 ml of ammonium perchlorate saturated solution to 200 ml of ethyl acetate, keep stirring at 1000 rpm during the addition process, ammonium perchlorate crystals will crystallize out due to supersaturation; finally pump the mixture Filter, wash with ethyl acetate, and dry the product in an oven at 80°C to obtain hollow ultrafine ammonium perchlorate.

[0029] The electron micrograph of the hollow ultrafine ammonium perchlorate that makes is as follows figure 1 and figure 2 , with a cubic hollow shape, a multi-layer cavity structure in the middle of the particle, and a particle size of about 10 μm to 15 μm. ...

Embodiment 2

[0032] Hollow superfine ammonium perchlorate and preparation method thereof, the steps are as follows:

[0033] First, at 40 °C, a certain amount of spherical ammonium perchlorate with a size of about 250 μm was dissolved in a mixed solvent of DMF / acetone with a volume ratio of 3:1 to prepare a saturated solution of ammonium perchlorate; then 10 Add the saturated ammonium perchlorate solution in 250 ml to 250 ml of ethyl acetate, keep the stirring speed of 1500 rpm during the addition process, the ammonium perchlorate crystals will crystallize out due to supersaturation; finally the mixed solution is suction filtered, washed with ethyl acetate, The product is dried in an oven at 50-150 °C to obtain hollow ultrafine ammonium perchlorate.

[0034] The prepared hollow ultrafine ammonium perchlorate has a cubic hollow shape, and the middle part of the particle has a multi-layer cavity structure, and the particle size is about 5 μm to 10 μm.

[0035]

Embodiment 3

[0037] Hollow superfine ammonium perchlorate and preparation method thereof, the steps are as follows:

[0038] First, at 30 °C, a certain amount of spherical ammonium perchlorate with a size of about 250 μm was dissolved in a mixed solvent of DMF / acetone with a volume ratio of 1:4 to prepare a saturated solution of ammonium perchlorate; then 10 Add 1 ml ammonium perchlorate saturated solution to 100 ml ethyl acetate, keep the stirring speed of 2000 rpm during the addition process, ammonium perchlorate crystals will crystallize out due to supersaturation; finally the mixed solution is suction filtered, washed with ethyl acetate, The product is dried in an oven at 50-150 °C to obtain hollow ultrafine ammonium perchlorate.

[0039] The prepared hollow ultrafine ammonium perchlorate has a cuboid hollow shape, the middle part of the particle has a multi-layer cavity structure, and the particle size is about 10 μm to 20 μm.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Particle sizeaaaaaaaaaa
Particle sizeaaaaaaaaaa
Particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention relates to a hollow ultrafine ammonium perchlorate and a preparation method thereof. The ammonium perchlorate is a material with a multilayer cavity structure in the middle part and has the particle size of 1-100mu m. The preparation method adopts a desolvation-recrystallization method, and comprises the following steps of: (1) dissolving the ammonium perchlorate into an N,N-dimethyl formamide / acetone mixed solvent to prepare a saturated solution; (2) under the conditions of certain stirring speed and solvent-anti solvent volume ratio, adding the ammonium perchlorate saturated solution into anti solvent ethyl acetate, and separating out the ammonium perchlorate by crystallization when supersaturation; and (3) after crystallization, filtering, washing and drying the product, thus obtaining the hollow ultrafine ammonium perchlorate. The ammonium perchlorate is an ultrafine powder material and has hollow morphology, thus being good in dispersity and ordered in structure and effectively improving the performance of a solid propellant. The desolvation-recrystallization method is simple, safe and convenient in operation.

Description

technical field [0001] The invention belongs to the technical field of energetic materials, and relates to an ultrafine particle and a preparation method thereof, in particular to a hollow ultrafine ammonium perchlorate and an antisolvent-recrystallization method thereof. Background technique [0002] In the field of solid propellants, ammonium perchlorate (AP) is one of the most commonly used oxidizers in solid propellants, and its weight ratio in solid propellants is as high as 60 to 80%. Therefore, the performance of solid propellant will change with the change of ammonium perchlorate characteristics, especially the particle size and morphology of AP. Ammonium perchlorate with ultra-fine or / and hollow morphology with a high specific surface area can effectively improve the performance of the propellant, and the smaller the particle size and the more hollow structures, the better the performance of the propellant. [0003] At present, various traditional methods for prepa...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C01B11/18
Inventor 马振叶赵凤起张利雄仪建华纪明卫
Owner NANJING NORMAL UNIVERSITY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com