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采用膨胀型阻燃剂(IFR)及协效剂海泡石(SP)对长玻璃纤维增强聚丙烯(PP/LGF)复合材料进行阻燃,通过双螺杆挤出机制备了PP/LGF母粒,IFR母粒和SP母粒,然后将这3种母粒通过注塑机制备了PP/LGF/IFR/SP复合材料,通过极限氧指数(LOI)、垂直燃烧测试、锥形量热仪、热重分析、扫描电子显微镜、力学性能测试等表征PP/LGF各阻燃复合体系的性能。结果表明,当IFR质量分数为22%时,PP/LGF/IFR阻燃复合材料的LOI为28.8%,且垂直燃烧等级达到V–0级;锥形量热仪测试结果表明加入IFR及SP后阻燃复合体系的第一热释放速率峰值降低,而第二热释放速率峰消失;SP质量分数为1%,IFR质量分数为21%的PP/LGF/IFR/SP阻燃复合材料LOI为29.6%,垂直燃烧等级达到V–0级,热释放速率峰值和总热释放量得到有效降低,热稳定性最好,且燃烧时产生致密的炭层覆盖于玻璃纤维表面,同时加入1%SP后复合材料的力学性能下降幅度相对较小。
The long glass fiber reinforced polypropylene (PP / LGF) composites were flame-retardant with intumescent flame retardant (IFR) and synergist sepiolite (SP). PP / LGF masterbatch was prepared by twin-screw extruder , IFR masterbatch and SP masterbatch. The PP / LGF / IFR / SP composites were prepared by injection molding of these three kinds of masterbatches. Through the limit oxygen index (LOI), vertical burning test, cone calorimeter, Re-analysis, scanning electron microscopy, mechanical properties of the flame retardant PP / LGF characterization of the performance of the composite system. The results showed that the LOI of PP / LGF / IFR composites reached 28.8% at IFR of 22%, and the V-0 level of vertical combustion. The results of cone calorimeter showed that the addition of IFR and SP The peak value of the first heat release rate of the flame retardant composite system decreased while the second heat release rate peak disappeared. The LOI of PP / LGF / IFR / SP flame retardant composite with 1% SP and 21% IFR was 29.6 %, And the vertical burning rating reaches V-0. The peak value of heat release rate and total heat release are effectively reduced, and the thermal stability is the best. When burning, a dense carbon layer is covered on the surface of the glass fiber, and after the addition of 1% SP The decrease of mechanical properties of composites is relatively small.