【摘要】 以硝酸镍和硝酸铝为主要原料,通过原位沉淀法将层状双氢氧化物（LDH）构筑于木粉（WF）表面,制备了表层被阻燃改性的WF,命名为WF@LDH。将WF@LDH用于制备聚丙烯（PP）基木塑复合材料（WPC）,并通过锥型量热测试（Cone）详细研究了WPC的燃烧性能。WF@LDH质量含量为50 wt%的PP₅₀/WF@LDH-4相较于WF含量为50 wt%的PP₅₀/WF热释放峰值（PHRR）、总热释放（THR）、总烟释放（TSP）分别下降20.9%,29.6%和75.0%,显示出优异的热和烟抑制效果。阻燃机理研究结果表明,LDH在高温下分解产生金属氧化物和水,同时分解形成的保护层通过物理隔绝作用产生一定的燃烧抑制效果,上述作用导致PP₅₀/WF@LDH-4燃烧时的烟和热释放量显著下降。更多还原

【Abstract】 With nickel nitrate and aluminum nitrate as main raw materials, layered double hydroxides（LDH）were constructed at the surface of wood flour（WF）by in-situ precipitation method, and the surface of WF was modified by flame retardant.The prepared modified WF was named as WF@LDH.WF@LDH was used to prepare polypropylene-based wood plastic composite（WPC）,and the combustion performance of WPC was studied in detail by cone calorimetry（Cone）.For PP₅₀/WF@LDH-4,the peak value of thermal release（pHRR）,total thermal release（THR）,and total smoke release（TSP）were respectively decreased by 20.9%,29.6%and 75.0%compared with the corresponding values of PP₅₀ /WF,showing excellent heat and smoke suppression effects.The study for flame-retardant mechanism showed that metal oxides and water were produced by decomposition of LDH@WF at high temperature, meanwhile, the protective layer formed by decomposition of LDH@WF had a combustion inhibition effect through physical isolation.The above-mentioned actions resulted in significant decreases in smoke and heat release.更多还原