纳米双羟基复合金属氧化物协同聚磷酸铵阻燃尼龙-6/聚丙烯燃烧及热降解行为的研究

Study on combustion and thermal degradation behaviors of flame-retarding PA-6/PP blends added with nano-LDH and APP

将纳米双羟基复合金属氧化物 (LDH)与聚磷酸铵 (APP)在一定范围内复配 ,用于尼龙 6/聚丙烯 (PA 6/PP)共混体系可产生良好的协同阻燃效果。实验表明 ,LDH参与了共混阻燃体系的热分解反应 ,催化了PA 6/PP/APP体系的交联、成炭 ;LDH协同阻燃体系的残炭形态致密、光滑、残炭微孔呈闭合状态。协同阻燃作用的机理与LDH和APP热降解过程中产物间的化学与物理作用有关。

Combustion and thermal degradation behaviors of polyamide 6 (PA 6)/polypropylene (PP) blends added with nano layered double hydroxides (LDH) and ammonium polyphosphate (APP) are studied. Results indicate that their flame retarding ability is improved by a synergic effect between LDH and APP. LDH can promote cross linking and char formation during the thermal degradation reaction of PA 6/PP/APP blends. Char in the blends becomes more homogeneous and compact and char micropores are in a closed state. The synergic flame retarding mechanism is related to chemical and physical effects of reaction products in LDH and APP thermal degradation.