苯并噁嗪协效二乙基次磷酸铝阻燃PA66复合材料的制备及性能

Preparation and Properties of Flame Retardant PA66 Composites with Benzoxazine and Diethyl-Phosphate Aluminum

摘要:

以双酚A型苯并噁嗪（BOZ）作为成炭协效剂，与二乙基次磷酸铝（ADP）复配,通过熔融共混制备了阻燃尼龙66（PA66）复合材料。通过垂直燃烧测试（UL94）、极限氧指数（LOI）、锥形量热（Cone）、扫描电镜（SEM）以及热分析（TG/DTG）等考察了复合材料的协同阻燃性能及作用机制。结果表明：BOZ和ADP具有良好的协同阻燃效应。适量BOZ的引入不但可以提高材料的阻燃性能，还可以改善材料的热稳定性，并且对材料的力学性能影响不大。添加0.3wt%BOZ和7.7wt%ADP时，ADP/BOZ阻燃PA66复合材料的垂直燃烧达到UL94 V-0级，LOI达到了32.8%，拉伸强度、弯曲强度分别为81.52、111.11MPa。阻燃机理研究表明：ADP/BOZ和ADP都是以气相阻燃作用为主的气相和凝聚相协同阻燃机制。

Abstract:

Flame-retardant PA66 composites were prepared by melt blending with bisphenol Abenzoxazine (BOZ) as a carbon synergist anddiethyl-phosphate aluminum (ADP). Their synergistic flame retardant effects and mechanism were investigated by means of UL94 vertical burning rating, limiting oxygen index(LOI), cone calorimeter test（Cone）, thermogravimetricanalysis(TGA) and scanningelectronmicroscope(SEM).The results showed that BOZ and ADP had good synergistic flame retardancy in PA66. Introducing proper amount of BOZ can not only improve the flame retardancy of the PA66 composites, but also significantly enhance the thermal stability especially the initial decomposition temperature. Moreover the mechanical properties of the composites are not much worse. When 0.3wt%BOZ and 7.7wt%ADP were added, the ADP/BOZ/PA66 composites reached UL94 V-0, LOI arrived to 32.8%, and their tensile strength and bending strength were 81.52MPa and 111.11MPa respectively. The study of flame retardant mechanism showed that both ADP/BOZ and ADP are dominated by gas phase flame-retardant mechanism and accompanying simultaneously condensed phase flame-retardant mechanism.