关键词: PVDF膜材；比光密度；质量损失率；烟气毒性

Abstract: The small-scale smoke production characteristics of PVDF film were studied under different thermal radiation intensities with or without ignition flame. Then the specific optical density, mass loss rate, smoke composition and other parameters of PVDF film were tested. It is found that when the heat radiation intensity reached 50 kW/m2, the PVDF film will burn no matter whether there is ignition flame or not; In the case of PVDF film ignited, the specific optical density of each mode has little change, but the specific optical density is the largest in the case of non ignited. At the same time, under the same ignition flame, the higher the thermal radiation intensity, the higher the mass loss rate of PVDF film; Under the same thermal radiation intensity, the mass loss rate of the mode with pilot flame is higher than that without pilot flame. In addition, the main harmful flue gas components released by PVDF film combustion are CO, CO2 and incomplete combustion hydrocarbons, as well as a small amount of HCN and SO2; Under the same thermal radiation intensity, the sample released more CO2 and CO in the mode with pilot flame than in the mode without pilot flame; Under the same ignition mode, the higher the thermal radiation intensity is, the more CO2 and CO will be released.

Key words: PVDF film; specific optical density; mass loss rate; smoke toxicity