Effect of fire extinguishing additives on wettability of wooden structure

doi:10.16265/j.cnki.issn1003-3033.2023.05.1157

Abstract

Abstract:

In order to find water-based fire extinguishing agent additives suitable for fighting wood fires, a cellulose-additive adsorption system under water environment was constructed by molecular simulation method to study the wetting mechanism of additives on the cellulose surface. Three fire extinguishing additives, amphoteric hydrocarbon surfactant BS-12, ionic fluorocarbon surfactant Capstone1157, and nonionic hydrocarbon surfactant AEO₉, were intervened in the cellulose wetting system, and the adsorption simulation of the cellulose-additive system on water molecules was realized at 298 and 498 K to explore the wetting mechanism and interfacial behavior. The simulation results show that, despite the different temperatures, the three additives involved in the cellulose wetting system significantly enhance the adsorption of water molecules, and the adsorption amount increases with the increase in the volume fraction of additives, and finally tends to be stable. During the wetting process, the electrostatic force in the system caused by the additive's own electrostatic potential is the main driving force of the adsorption behavior, and the vertical degree of its adsorption direction determines the strength of its adsorption capacity. The contact angle measurements are in high agreement with the simulated results of water molecule adsorption for the three additive systems, and BS-12 and Capstone1157 are more effective than AEO₉ in enhancing the wettability of cellulose.

Key words: additives, timber fires, wettability, water-based extinguishing agents, surfactants, contact angle

MENG Junqing, LIANG Yimin, CHANG Chenxi, LYU Yingpei. Effect of fire extinguishing additives on wettability of wooden structure[J]. China Safety Science Journal, 2023, 33(5): 121-127.

Figures/Tables 7

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