A study of Pyrolysis Characteristics of Decorative Wallpaper

The pyrolysis characteristics of decorative wallpaper are studied by thermogravimetric analysis(TGA) technology under various combinations of different heating rates(10,15,20 ℃/min),atmospheres(nitrogen,air) and air flow rates(10,30,50 ml/min).The results indicate that the pyrolysis weight loss of the materials is strongly dependent on their compositions.The total weight loss is the sum of the weight losses of every ingredient.The initial temperature of the primary pyrolysis stage and the temperature corresponding to the maximal weight loss rate increase with the increase of heating rate.As the heating rate increases,TG curves shift toward the high temperature zone.As to the influences of atmosphere,it's found that the presence of oxygen can alter the mechanism of pyrolysis,leading to lower beginning pyrolysis temperature,faster pyrolysis rate,and more complete reaction.The increase of air flow rate will supply more oxygen to the reaction zone and dispel the gas products from the materials,which will accelerate the reaction,increase the rate of weight loss,thus raising the fire hazardous level of atmosphere.The activation energy and prefrequency factor were determined from the analysis of TG-DTG curves.The calculation results show that in nitrogen atmosphere,the activation energy increases with the increase of heating rate.