无机包覆聚苯乙烯泡沫板烟气产生规律研究

On the smoke density producing regularity from the inorganic coated polystyrene foam combustion in the fire

聚苯乙烯泡沫板在建筑节能中具有重要应用,其阻燃防火性能影响建筑火灾安全。应用UL-94垂直燃烧性能测试方法研究无机包覆聚苯乙烯泡沫板在垂直状态下的燃烧情况,结果表明包覆后的聚苯乙烯试样的等级可达到V-1以上;应用烟密度仪和气体分析仪研究无机包覆聚苯乙烯泡沫板燃烧烟气产生规律,结果表明MgSO4/MgO、α-石膏、无机黏结剂、无机粘结剂/膨润土均对聚苯乙烯泡沫起到阻燃效果,并对烟气产生抑制作用,抑烟能力由大到小为MgSO4/MgO,α-石膏、无机黏结剂/膨润土、无机黏结剂。同时能不同程度地影响聚苯乙烯泡沫燃烧时产生CO2、CO有毒有害气体的体积分数,其中CO2的最大体积分数分别为2.09%、1.79%、1.52%、1.62%;CO的最大体积分数分别为434×10^-6、340×10^-6、358×10^-6、369×10^-6,从数据分析可知,4种无机包覆聚苯板中,无机黏结剂在4种包覆剂中对CO2生成的影响效果更佳,α-石膏在4种包覆剂中对CO生成的影响效果更佳。

The present paper is to make a quantitative investgation of the combustion performance of the inorganic coating polystyrene foam board in the fire,for its flame retardant performance can greatly affect the building fire safety.What is more,the smoking production can also be of great importance for the development of the fire control.Therefore,for the research purpose,we prefer to use a horizontal vertical burning tester to make the test of UL-94 vertical combustion.The results of our testing show that the polystyrene foam board can get to burn very intensely,whose burning level of the said foam board can reach over V-1,though its flame can not spread to the fixed position with no drip of ignition.We have also managed to use the smoke density tester and gas analyzer to test and analysze the regulaity of the smoke movement when the inorganic coating polystyrene foam board gets burned.The results of our investigation show that the polystyrene foam can have a flame retardant effect by the MgSO4/MgO,α-gypsum,inorganic binder,the inorganic binder/bentonite,and inhibition of smoke,whose smoke suppression capacity turns to be in a descending order as shown as below：MgSO4/MgO alpha gypsum inorganic binder/Bentonite inorganic binder.At the same time,the testing results can also affect the concentration of CO2 and CO produced by the burning of the polystyrene foam board.In addition,the maximum fractions of CO2 volume can be ：2.09%,1.79%,1.52%,1.62%;with the maximum fractions of CO volume can be：434×10^-6,340×10^-6,358×10^-6,369×10^-6 while the gas concentration can reach the highest rates in the50-60 s for polystyrene foam fast burning and decomposition quickly.Nevertheless,the time to reach the maximum rates at varying degrees may delay for about 50-100 s when the inorganic coating agent were to be used to control the turning up of toxic and harmful gases.Thus,according to UL-94 vertical combustion,smoke density and the gas analysis results,the coated polystyrene foam board may take up the structure of similar cellular when it is burned up.It can help to improve the carbon layer thickness support from the expansion of carbon residue structure effectively so that it can have a nice antiheat barrier.Meanwhile,this kind of structure can also offer a certain adsorption capacity for the emissions of gas and solid particles produced by the combustion residue,though its effect on the resistance against harmful gases intrusions remains not so remarkable.