主管:中华人民共和国应急管理部
主办:应急管理部天津消防研究所
ISSN 1009-0029  CN 12-1311/TU

Fire Science and Technology ›› 2021, Vol. 40 ›› Issue (1): 64-67.

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Hot aerosol extinguishing agent based on freeze-drying co-crystallization process

LIU Si-yu, ZHU Chen-guang, ZHANG Ming-xing   

  1. School of Chemical Engineering, Nanjing University of Science and Technology, Jiangsu Nanjing 210094, Chin
  • Online:2021-01-15 Published:2021-01-15

Abstract: To improve the combustion and fire- extinguishing performance of hot aerosol extinguishing agents (HAEAs), a new type of HAEA was prepared by freeze-drying co-crystallization process in this paper. Eight groups of HAEAs with an increasing mass ratio of 45% ~ 60% potassium nitrate and a decreasing mass ratio of 55% ~ 40% lactose were co- crystallized and compared with the mechanically mixed HAEAs of the same composition and proportion. The results of fire- extinguishing performance test show that the co- crystallization process can significantly shorten the extinguishing time of the HAEAs. The fire- extinguishing effect was best when the ratio of potassium nitrate to lactose was 4.75:4.25, and the fire-extinguishing time was shortened from 6.91s to 1.00 s. The co- crystallized products were characterized by scanning electron microscope (SEM), thermal analysis (TG/DSC), powder X- ray diffraction (PXRD), and Fourier transform infrared reflection (FTIR). The results indicated that there were co-crystallized products different from raw materials.

Key words: co- crystallization, hot aerosol extinguishing agent, extinguishing efficiency