摘要
利用水玻璃作为无机硅对木粉进行表面阻燃处理,同时利用硅橡胶作为有机硅对木塑复合材料进行阻燃。结果表明:含有经过水玻璃处理木粉的WPC较含未处理木粉的WPC的氧指数明显提高,而体系的热稳定性提高较少。加入硅橡胶后,体系的稳定性和残炭(余)量明显提高;同时在相同处理木粉含量的WPC中,氧指数随着硅橡胶的含量的增加先降后增。SEM和表面显微分析表明处理后的木粉被硅酸钠所包覆,能有效地对木粉进行阻燃;硅橡胶高温分解生成二氧化硅层,有效地提高了体系的氧指数。
The sodium silicate was employed as inorganic silicon to treat the surface of wood flour. Meanwhile the silicon rubber was used as organic silicon to enhance the flame retardance of WPCs containing sodium silicate-cured wood flour. The results showed that WPCs containing sodium silicate-cured wood flour had higher limit oxygen index （LOI）than that of containing uncured wood flour. But the thermal stability was slightly improved. Both the carbon residue and the stability were greatly improved by adding silicon rubber. The LOI of WPC with sodium silicate-cured wood flour firstly decreased, and then increased along with the rising silicon rubber content. The SEM confirmed that the surface of wood flour was covered by sodium silicate which could effectively improve the flame retardance of the wood flour. The silica-based thick layer formed by the pyrolysis of silicon rubber at high temperature which enhanced the LOI of system.
出处
《化学与粘合》
CAS
2013年第4期46-50,共5页
Chemistry and Adhesion
关键词
木塑复合材料
PE
EVA
水玻璃
硅橡胶
Wood plastic composites
PE/EVA
sodium silicate
silicon rubber
