以次磷酸铝(AHP)为阻燃剂对高密度聚乙烯(HDPE)基木塑复合材料进行阻燃改性.采用锥形量热、垂直燃烧、极限氧指数(LOI)系统评价复合材料的阻燃性能.通过拉伸强度、无缺口冲击强度、弯曲强度等测试,探讨了复合材料的力学性能.并通过热失重分析、扫描电镜对AHP阻燃木粉/HDPE(WF/HDPE)复合材料的机理进行分析.结果表明,AHP、木粉(WF)及WF中的结合水构成膨胀阻燃体系,AHP质量分数为30％时,WF/HDPE复合材料达到垂直燃烧V-0级别,LOI值达到25.5％,阻燃性能显著提高.AHP的加入使WF/HDPE复合材料的力学性能有所下降.
The wood flour/HDPE composites (WF/HDPE) was modified with aluminum phosphate (AHP) as flame retardant.The flame retardant properties of WF/HDPE composites were studied by UL-94,limiting oxygen index (LOI),cone calorimeter test (CCT),and mechanical properties were studied by measurements of tensile strength,unnotched impact strength and flexural strength.The flame retardant mechanism of AHP was investigated by thermogravimetric analysis (TGA) and scanning dectron microscopy (SEM).The results show that,AHP,WF and the bound water in WF construct an intumescent flame-retardant.When the mass fraction of AHP is 30 ％,WF/HDPE composite achieves UL-94 V-0 rating,the oxygen index reaches 25.5％ and the flame retardant property is improved significantly.However,mechanical properties of WF/HDPE composites decrease to some extent due to addition of AHP.
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