Experimental study on explosion characteristics of epoxy electrostatic coating powder mixed with different proportions of calcium carbonate

Xun Zou, Yanhui Wang, Kai Wang, Yajie Bu, Qingwu Zhang, Yuan Yu, Juncheng Jiang

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Epoxy (EP) powder is widely used in the industrial field of electrostatic coating due to its excellent physicochemical properties. However, the dust explosion risk caused by its flammability cannot be ignored. Calcium carbonate (CaCO3) is often added into EP as an inorganic fillers because of its low cost and wide availability. This study explores the effects of different proportions of CaCO3 on the explosion characteristics and pyrolysis behavior of EP powder. The results show that the maximum explosion pressure (Pmax), the minimum ignition energy (MIE), and the minimum ignition temperature (MIT) of EP are 6.82 bar, 6 mJ, and 460 °C, respectively. The addition of CaCO3 reduces the explosion sensitivity and severity of EP dust to a certain extent. The thermal decomposition of CaCO3 absorbs heat and produces CaO and CO2. This process hinders the oxygen transfer, and dilutes the flammable volatiles, thereby reducing the explosion hazard of EP dust.

Original languageEnglish
Article number120243
JournalPowder Technology
Volume448
DOIs
StatePublished - 1 Dec 2024

Keywords

  • Calcium carbonate
  • Dust explosion
  • Electrostatic coating
  • Epoxy powder

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