聚硼硅氧烷与有机磷酸酯阻燃剂复配协同阻燃聚碳酸酯

Synergistic effect between polyborosiloxane and organophosphate flame retardants on polycarbonate

将聚硼硅氧烷(PB)阻燃剂分别与三种有机磷酸酯(OPP)阻燃剂进行复配,并将此复合阻燃剂添加到聚碳酸酯(PC)中制备了阻燃PC材料(FR-PC)。采用极限氧指数(LOI)和锥形量热分析研究了PB对OPP/PC体系的协同阻燃作用。结果表明:阻燃剂总质量分数为5%时,添加质量分数1.25%以上的PB可以提高OPP/PC体系的LOI;PB阻燃剂具有促进成炭的作用,可使OPP/PC复合体系在燃烧过程中释放的烟、热以及CO有不同程度的降低,燃烧过程趋于平缓,尤其使体系的烟释放量显著降低,三种OPP/PC阻燃体系的总烟释放量下降31.8%～51.0%,大大降低了火灾的危害性;添加适量PB能够提高OPP/PC体系的拉伸强度、弯曲强度及维卡软化点温度,并且使PC复合阻燃材料的透光率有所提高,保持了PC良好的透明性。

The flame-retardant polycarbonates （PC） were prepared by mixing the PC with different compounded flame retardants which were obtained by separately mixing the polyborosiloxane （PB） with three types of organophosphate （OPP）. The synergistic effect of PB on OPP/PC system was evaluated using limited oxygen index （LOI） and cone calorimeter analysis. The results show that, at 5 % mass fraction of total flame retardant addition, the compounded flame retardant with above 1.25% mass fraction of PB can improve the LOI of the PB - OPP/PC system. PB flame retardant promotes the char formation during the combustion of the PB- OPP/PC, which reduces the emission of the smoke, heat and CO. The total smoke release decreases by 31.8% to 51.0% when each of the three compounded flame retardants is added into PC. The combustion process is moderated and the hazard of fire is reduced. It is also found that the moderate addition of PB improves the tensile strength, flexural strength, vicat temperature and the transparency of PB - OPP/PC .