The Effect of Nano-Hydrotalcite-Zinc Oxide on Flame Retardant and Smoke Suppression of Flexible PVC
To reduce the smoke release of flexible poly (vinyl chloride) (PVC) as its burning, nano-hydrotalcite and nano-Zinc oxide (ZnO) were used to modify the polymer. The results indicated that the addition of hydrotalcite-ZnO had a significant effect for flame retardant. The limiting oxygen index (LOI) is up to a maximum value and the smoke density rank (SDR) exhibited a lower value when the weight percentages of hydrotalcite and ZnO in PVC are 3％ and 2％, respectively. Thermal stabilities of the modified PVC and decomposed products were investigated by means of thermogravimetry and prolysis - gas chromatography - mass spectrum (Py-GC-MS). As a result, hydrotalcite- ZnO obviously accelerated decomposition of PVC to release hydrogen chloride, and the decomposed PVC consequently produced the trans-conjugated polyene sequences, which easily formed cross-linked structures. However, a cyclization reaction in PVC chain without the additives produced aromatic compounds such as benzene and naphthalene at 400℃. Even though the amount of aromatic compounds was released from the PVC modified with hydrotalcite-ZnO at the temperature of 600℃, the content of the decomposed products is relatively lower, comparing with unmodified PVC.
PVC hydrotalcite zinc oxide flame retardant smoke suppression
YAN Chunmian ZHANG Zhonghou HE Linghao GAO Lijun FANG Shaoming
Zhengzhou University of Light Industry, Henan Provincial Key Lab of Surface and interface Science, Z Zhengzhou University of Light Industry, Henan Provincial Key Lab of Surface and interface Science, Z
国际会议
上海
英文
950-952
2007-10-15（万方平台首次上网日期，不代表论文的发表时间）