Aqlibous Abderrahman, Tretsiakova-McNally Svetlana, Fateh Talal
INSA Centre Val de Loire, 88 boulevard Lahitolle, CS60013, 18022 Bourges CEDEX, France.
Belfast School of Architecture and the Built Environment, Ulster University, Newtownabbey BT37 0QB, Northern Ireland, UK.
Polymers (Basel). 2020 Mar 31;12(4):757. doi: 10.3390/polym12040757.
Flammability and combustion of softwood treated with intumescent coatings were studied in the present work. The formulations applied onto wood surfaces contained different ratios of industrial fillers, titanium dioxide TiO and aluminium trihydroxide Al(OH), and/or bio-fillers, eggshell and rice husk ash. Combustion behaviours of unprotected and protected wood samples have been examined with the aid of cone calorimetry performed under the varied levels of thermal flux ranging from 30 to 50 kW/m². The char residues obtained after the completion of cone calorimetry test at 40 kW/m² were analysed by the Raman spectroscopy. The fire protective properties of the studied coatings were strongly influenced by the nature of the fillers as well as by the intensity of thermal irradiance. The incorporation of bio-based fillers into the water-based intumescent formulations significantly improved fire resistance of wood substrates. For example, at 30 kW/m², the Effective Heat of Combustion was reduced by more than 40%, whilst the average Peak to Heat Release Rate had dropped from 193.2 to 150.3 kW/m² for the wood sample protected with the formulation incorporating two industrial and two bio-fillers. Moreover, an application of the studied coatings resulted in a notable reduction of the back surface temperature of the wood specimens.
本研究对用膨胀型涂料处理过的软木的可燃性和燃烧情况进行了研究。涂覆在木材表面的配方含有不同比例的工业填料、二氧化钛（TiO）和氢氧化铝（Al(OH)₃），以及/或者生物填料、蛋壳和稻壳灰。借助锥形量热法，在30至50 kW/m²的不同热通量水平下，对未保护和已保护木材样品的燃烧行为进行了检测。通过拉曼光谱对在40 kW/m²下完成锥形量热试验后获得的炭渣进行了分析。所研究涂料的防火性能受到填料性质以及热辐照强度的强烈影响。将生物基填料加入到水性膨胀型配方中，显著提高了木材基材的耐火性。例如，在30 kW/m²时，对于用含有两种工业填料和两种生物填料的配方保护的木材样品，燃烧有效热降低了40%以上，而平均热释放峰值速率从193.2 kW/m²降至150.3 kW/m²。此外，应用所研究的涂料使木材试样的背面温度显著降低。
