Citation

Shi Q, Yang H, Li H. China Saf. Sci. J. 2022; 32(10): 121-126.

Copyright

(Copyright © 2022, China Occupational Safety and Health Association, Publisher Gai Xue bao)

DOI

10.16265/j.cnki.issn1003-3033.2022.10.2201

PMID

unavailable

Abstract

Aiming at the poor stability and short time for oxygen isolation of the existing fire⁃ extinguishing foams, the novel colloidal foam technology with long⁃lasting water retention and film⁃forming function has been developed. The influence of the composition ratio on the foaming and stability of colloidal foam, its film⁃forming characteristics, and its inhibition and extinguishment characteristics were analyzed. The results show that the prepared colloidal foam using 0. 3% foaming agent, 0. 4% thickening agent (TA), and 0. 3% crosslinking agent(CA)exhibited the best comprehensive performance with the half⁃life and expansion ratio above 120 h and 5 times respectively. Moreover, colloidal foam could wrap the high⁃ site ignition sources quickly to cover and extinguish. In addition, there would be a dense colloidal oxygen barrier film formed from the drying colloidal foam on the surface of the coal, which achieved the long⁃ lasting prevention and control of coal spontaneous combustion. © 2022 China Safety Science Journal. All rights reserved.

Language: zh