Abstract
Under high temperature, aqueous film forming foam extinguishing agent has poor flame retardancy and low fire efficiency. In order to solve this problem, talc was introduced into foam to form composite foam. The fire resistance and fire extinguishing properties of the composite foam were studied. The results showed that talc composite foam had good flame retardant resistance. when the concentration of talc reached 40 g/100 ml, the 50% liquid separation time of the composite foam was 21.1 min. The fuel burning in the anti burning tank did not ignite the gasoline in the oil pan, and burned out at 51.5 min. It was related to the structure of composite foam and the properties of talc. Due to the introduction of talc, the viscosity of the composite foam increased. The network structure of composite foam was important to the improved stability of foam. Talc powder formed a dense layer covering the oil surface, which effectively isolated the oil from the air.
Highlights
Talc is used mainly in medicine, cosmetics, ceramics, paper making, coatings, wires and cables, and various chemical industries (Liu et al, 2020; Nair and Sairam, 2021)
Measurement of Flame Retardancy The talc of 0, 10, 20, 30, 40, 50 and 60 g were added into the 100 ml aqueous film forming foam respectively and the composite foam was prepared by Waring- Blender method
Fire Resistance Fire resistance was an important performance of composite foam (Shi et al, 2020)
Summary
Talc is used mainly in medicine, cosmetics, ceramics, paper making, coatings, wires and cables, and various chemical industries (Liu et al, 2020; Nair and Sairam, 2021). The main component of talc is hydrous magnesium silicate, the molecular formula is Mg3 [Si4O10] (OH), and the density is 2.7 ∼ 2.80 g/cm. Each crystal layer is composed of two layers of Si-O tetrahedron sandwiched with a layer of Mg-O (O-H) octahedron. The Si-O tetrahedron is connected into layers to form a continuous hexagonal network layer with active oxygen facing one side, and the active oxygen of each hexagonal network layer is facing each other through a layer of "magnesium hydroxide" layer. Aqueous film forming foam is considered to be the best oil fire extinguishing agent. The foam formed by aqueous film forming foam is not stable. The sealing time to oil surface and the reburning time are relatively short. Talc was considered to be added into aqueous film forming foam. The flame retardancy and mechanism of talc composite foams should be studied
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