Encapsulation of Oxidizers: Efficient Method by Spout-fluid Bed

Authors

  • Jessica de Oliveira Silva
  • Josiane Ribeiro Campos Silva
  • Lucas Barros de Oliveira
  • Marcio Yuji Nagamachi
  • Luiz Fernando de Araujo Ferrão

Keywords:

Ammonium perchlorates, Solid rocket propellants, Composite propellants, Encapsulating

Abstract

In composite solid propellants, the oxidizer in the form of particles is embedded in a polymeric matrix. In general, these oxidizers consist in inorganic salts that are hygroscopic, chemically incompatible or sensitive to friction or impact, so that microencapsulation can be applied as a mean to provide a protective coating layer. This work aims to assess the effectiveness of the spout-fluid bed method to perform microencapsulation of ammonium perchlorate particles with acrylic-based resin. The formed coating integrity was assessed by an optical stereomicroscope for samples with one, two and four layers of coating before and after dissolving the cores in water. The parameters utilized in this method provided a complete and individualized encapsulation with sufficient integrity. Therefore, the spout-fluid bed method proved to be effective, particularly with the application of multiple layers.

10o ENCONTRO TÉCNICO DE MATERIAIS E QUÍMICA

Downloads

Published

2020-01-21

Issue

Vol. 11 (2019): JATM-ETMQ (Special edition)

Section

Original Papers

License

This work is licensed under a Creative Commons — Attribution 4.0 International — CC BY 4.0. Authors are free to Share (copy and redistribute the material in any medium or format) and Adapt (remix, transform, and build upon the material for any purpose, even commercially). JATM allow the authors to retain publishing rights without restrictions.