Sonnier Rodolphe, Ferry Laurent, Gallard Benjamin, Boudenne Abderrahim, Lavaud François
MA-Ecole des Mines d'Alès, 6 avenue de Clavières, Alès 30100, France.
CERTES, Université Paris-Est, Créteil Val de Marne, 61 Avenue du Général de Gaulle, 94010 Créteil cedex, France.
Materials (Basel). 2015 Oct 12;8(10):6935-6949. doi: 10.3390/ma8105349.
Semi-opaque to opaque films containing small amounts of various aluminium particles to decrease emissivity were easily prepared and coated onto low-density polyethylene (LDPE) sheets. The thermal-radiative properties (reflectivity, transmissivity and absorptivity) of the films were measured and related to the aluminum particles' content, size and nature. Time-to-ignition of samples was assessed using a cone calorimeter at different heat flux values (35, 50 and 75 kW/m²). The coatings allowed significant ignition delay and, in some cases, changed the material behaviour from thermally thin to thick behaviour. These effects are related both to their emissivity and transmissivity. A lower emissivity, which decreases during the degradation, and a lower transmissivity are the key points to ensure an optimal reaction-to-fire.
含有少量各种铝颗粒以降低发射率的半透明至不透明薄膜很容易制备，并涂覆在低密度聚乙烯（LDPE）片材上。测量了薄膜的热辐射特性（反射率、透射率和吸收率），并将其与铝颗粒的含量、尺寸和性质相关联。使用锥形量热仪在不同热通量值（35、50和75kW/m²）下评估样品的点燃时间。这些涂层可显著延迟点火，在某些情况下，还会使材料行为从热薄行为转变为热厚行为。这些效果与它们的发射率和透射率都有关。在降解过程中降低的较低发射率和较低的透射率是确保最佳火灾反应的关键因素。
