阻燃剂硼酸-硼砂对杨木定向刨花板热解特性的影响

为探究阻燃剂硼酸-- 硼砂对杨木定向刨花板热解特性的影响,用同步热分析仪研究了硼酸-- 硼砂阻燃杨木定向刨花板升温速率为10 ℃/min、终温700 ℃的热分解反应。结果表明:硼酸-- 硼砂对阻燃杨木定向刨花板快速热解阶段的反应起到抑制作用,使得最大失重速率对应的特征温度后移,残炭率显著增加。阻燃杨木定向刨花板的最概然机理为球形对称的3维扩散,满足Ginstling-Broushtein方程。未经阻燃处理及添加9%、12%硼酸-- 硼砂的杨木定向刨花板在快速热解阶段的反应活化能分别为101.690、116.635、129.225 kJ/mol,硼酸-- 硼砂使杨木定向刨花板在快速热解阶段所需的能量增加。 

The effect of boric acid-borax on the pyrolysis characteristics of poplar oriented strand board

In order to explore the effect of flame-retardant boric acid-borax on the pyrolysis characteristics of poplar oriented strand board (OSB), a TGA /DSC1/1600HT thermogravimetric device was used to analyze the thermal decomposition of boric acid-borax for retarding the inflamation of poplar oriented strand board at a heating rate of 10 ℃/ min and a final temperature of 700 ℃. The results showed that boric acid-borax restrained a major rapid pyrolysis process in poplar OSB. With additional amounts of flame retardants, the characteristic temperature of the maximum rate of weight loss increased. The rate of pyrolysis in the carbon residue of flame-retardant poplar OSB increased markedly. The pyrolysis process of flame-retarding poplar OSB complied with the Ginstling-Broushtein equation, which suggests that the mechanism of pyrolysis in flame-retardant poplar OSB is one of spherical symmetric tri-dimensional diffusion. The activation energy in the rapid pyrolysis of OSB was 101.690 kJ/mol without any flame-retardant, 116.635 with 9% boric acid-borax and 129.225 kJ/mol with 12% active acid, indicating that adding boric acid-borax to poplar OSB increases the amount of energy required in the pyrolysis process.