Flame inhibition by calcium compounds: Effects of calcium compounds on downward flame spread over solid cellulosic fuel

Koshiba, Yusuke; Haga, Takuya; Ohtani, Hideo

doi:10.1016/j.firesaf.2019.102865

Cited by 11 publications

(6 citation statements)

References 35 publications

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“…The emission of this gas corresponds to the thermal decomposition of sodium bicarbonate and calcium carbonate. The gas will therefore be carbon dioxide [ 7 , 8 , 32 ].…”

Section: Resultsmentioning

confidence: 99%

The Effect of Magnesium Hydroxide Addition on the Extinguishing Efficiency of Sodium Bicarbonate Powders

et al. 2022

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This article analyzes the possibility of the modification of BC powder (a mixture of sodium bicarbonate and calcium carbonate) with magnesium hydroxide (Mg(OH)2). Extinguishing efficiency as well as the influence of this additive on other physicochemical properties were determined by performing a 13B fire test, rheological measurements of the powders, thermal tests (thermogravimetry (TG) and differential scanning calorimetry (DSC) in combination with quadrupole mass spectrometry (QMS)) and microscopic observations of the powders’ surface (scanning electron microscope (SEM) with energy dispersive X-ray analysis (EDS)). It was found that the increase of the Mg(OH)2 content causes deterioration of the rheological properties by increasing the slope angle of the flow curve in relation to the normal stress (the tangent of the flow curve slope varying from 0.258 for 5% of Mg(OH)2 up to 0.330 for 20% of Mg(OH)2). However, at the same time, the increased content of Mg(OH)2 increases the total energy of the chemical decomposition reaction (from −47.27 J/g for 5% of Mg(OH)2 up to −213.6 J/g for 20% of Mg(OH)2) resulting in the desirable higher level of heat removal from the fire. The initial extinguishing effect of the fire becomes more effective as the hydroxide content increases (within the first 2 s), but at a later stage (from t = 63 s), the temperature is no longer sufficient (it is below 350 °C) for thermal decomposition of Mg(OH)2. As such, the optimal content of Mg(OH)2 is 10–15%. The obtained results allowed for the assessment of the impact of individual powder components on its extinguishing effect and will contribute to the development of science in the field of developing new types of extinguishing powders.

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“…The emission of this gas corresponds to the thermal decomposition of sodium bicarbonate and calcium carbonate. The gas will therefore be carbon dioxide [ 7 , 8 , 32 ].…”

Section: Resultsmentioning

confidence: 99%

The Effect of Magnesium Hydroxide Addition on the Extinguishing Efficiency of Sodium Bicarbonate Powders

et al. 2022

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“…With the introduction of POE‐g‐MAH, the content of rPE continues to decrease, so the calcium carbonate contained in it also gradually decreases. And most of the calcium carbonate particles with good thermal stability are tightly coated and uniformly dispersed in the POE‐g‐MAH, which cannot act as a thermal barrier 56,57 . Composite with higher rPE content will leave more ash after burning.…”

Section: Resultsmentioning

confidence: 99%

Recycled polyethylene/polyethylene‐ethylene‐1‐octene‐maleic anhydride composite with improved mechanical properties

Wang

Gao

et al. 2021

J of Applied Polymer Sci

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Owing to the thermomechanical degradation and impurities, the high‐value utilization of waste packaging plastics is still a great challenge. In this work, we confirmed that the major sort of impurity in waste polyethylene (PE) packing films is calcium carbonate. Consequently, PE/poly(ethylene‐co‐1‐octene)‐maleic anhydride (rPE/POE‐g‐MAH) and poly(ethylene‐co‐1‐octene) (rPE/POE) composites were recycled using a custom‐made three‐screw extruder, who can supply intensive shear flow during extrusion. The POE‐g‐MAH is detected to be filled between PE and inorganic impurities, and the compatibility is improved through chemical reactions. As mechanical test manifested, the rPE/POE‐g‐MAH blends present higher tensile strength and elongation at break than the rPE/POE blends at the same composition. The reason for such improved toughness of composite was explained in detail through the tensile fracture surface analysis. Rheology test further shows that POE‐g‐MAH improves the compatibility of matrix and impurities. In summary, this article provides a sustainable route for enhancing the poor ductility of recycled express bags in a simple and economical way, which could pave an avenue for high‐value utilization of waste packaging plastics. At the same time, it also provides new solutions for material selection in packaging, construction, agriculture and other fields.

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“…6. The same apparatus was employed in a previous study [42]. The transparent acrylic tube was 300 mm high and 80 mm in diameter.…”

Section: Methodsmentioning

confidence: 99%

Synthesis and combustion inhibition efficiency of iron short-chain perfluorocarboxylates

Koshiba

Tsunokuma

Ohtani

2020

Fire Safety Journal

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Flame inhibition by calcium compounds: Effects of calcium compounds on downward flame spread over solid cellulosic fuel

Cited by 11 publications

References 35 publications

The Effect of Magnesium Hydroxide Addition on the Extinguishing Efficiency of Sodium Bicarbonate Powders

The Effect of Magnesium Hydroxide Addition on the Extinguishing Efficiency of Sodium Bicarbonate Powders

Recycled polyethylene/polyethylene‐ethylene‐1‐octene‐maleic anhydride composite with improved mechanical properties

Synthesis and combustion inhibition efficiency of iron short-chain perfluorocarboxylates

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