PS／MH复合材料的燃烧性能研究

Combustion behavior of PS/MH composites

将聚苯乙烯(PS)树脂与改性后的氢氧化镁(MH)进行熔融共混制备PS/MH复合材料。通过X射线衍射分析了复合材料的微观结构,采用水平燃烧实验、氧指数实验和高温处理实验研究了复合材料的燃烧性能。结果表明:在制备和加工过程中,复合材料中的MH的微观结构并没有发生变化。因此,复合材料中MH的阻燃机理不变。随着MH含量增加,复合材料的发烟和滴落减少,水平燃烧速率从34.08mm/min下降至22.84 mm/min,MH用量达到80 phr时复合材料能够自熄,材料的氧指数达24.0%。MH的引入使复合材料在高温下的残留率增大,热稳定性和阻燃性能增强。

The authors prepared one kind of composite material hydroxide （PS/MH） by direct melt blending process. The consisting of polystyrene and modified magnesium microstructure of the composite was analyzed with X-ray diffractometry and the combustion behaviour of the composite was investigated by means of horizontal burning test, oxygen index test and high temperature treatment. The results indicate that there exists not any variation in crystalline structure of MH added in the composites during the preparation and processing course, compared with pure MH as reference. Therefore, the flame retardation mechanism of MH in the composite is expected to remain unchanged. With the increase of MH content, both the released smoke and melt dripping of the composite gradually diminish, the horizontal burning rate decreases from 34.08 mm/min to 22.84 mm/min. Self-extinguishing occurs when the MH content reaches 80 phr, meanwhile, the oxygen index of the composites reaches 24.0%. The introduction of MH can raise the residue rate of the composites at high temperatures and therefore, the thermal stability and flame retardancy of the composites can be significantly enhanced.