有机硅阻燃木塑复合材料的性能研究

Properties of organosilicon flame retardant wood-plastic composites

利用甲基苯基聚硼硅氧烷(PB)及其与纳米Si O2或APP的复合阻燃剂制备了阻燃木塑复合材料,研究了阻燃剂对木塑复合材料(WPC)阻燃性能和力学性能的影响。结果表明,在热降解过程中,聚硼硅氧烷显著提高了木塑复合材料的800℃残炭率,促进了残炭的形成,PB与纳米Si O2或APP复配使用可使木塑复合材料的热降解残炭进一步提高。PB及其复合阻燃剂使木塑复合材料的热、CO2释放速率及质量损失率降低,PB与APP复配对木塑复合材料的阻燃效果最好。PB及其复合阻燃剂使木塑复合材料的弯曲强度明显提高,对拉伸强度影响不大,但使冲击强度下降。

The different flame retardant wood-plastic composites are prepared by adding methylphenyl polyborosiloxane （PB）, PB/APP composite flame retardant and PB/nano-SiO2 composite flame retardant to wood-plastic composites （WPC）, respectively. The influence of the flame retardants on the flame retardancy and the mechanical properties of the wood-plastic composites are studied. The results show that polyborosiloxane increases the degradation residue of the WPC at 800℃ during the thermal degradation process and promotes the formation of carbon residue. The PB/nano SiO2 or PB/APP composite flame retardant further improves the thermal degradation residual of the WPC. The polyborosiloxane and its composite flame retardants can also reduce the emissions of heat, CO2 and mass loss rate during the combustion of the WPC. Among the three types of flame retardant composites, the polyborosiloxane/APP composite flame retardant provides the best flame retardancy for the WPC. The polyborosiloxane and its composite flame retardants improve the flexural strength of the WPC significantly and keep the tensile strength of the WPC as the same as virgin, but reduce the impact strength of the WPC.