ZIF-8协同膨胀阻燃聚丙烯制备及性能研究

Study on preparation and properties of ZIF-8 synergistic intumescent flame retardant polypropylene

为提高纯聚丙烯（PP）使用过程中的本质安全性,改善其阻燃和抗静电性能,利用ZIF-8类沸石咪唑酯骨架材料、聚磷酸铵（APP）和季戊四醇（PER）制备新型无卤膨胀阻燃复合材料（ZIF-8/PP）,通过氧指数、力学测试、热重分析、电阻测量等研究ZIF-8对聚丙烯性能的影响。结果表明：ZIF-8能有效提高纯PP的阻燃、抗静电性能,但使其力学性能降低;ZIF-8质量分数为3%时,ZIF-8/PP的氧指数达到28%,拉伸强度降为21.2 MPa,表面电阻率降至10^8Ω·cm,实现从绝缘体到防静电体的转变;ZIF-8能增加ZIF-8/PP的残炭量,在熔体表面形成致密泡孔形貌的炭层抑制烟气,使材料的热稳定性提高。

To improve the intrinsic safety of pure PP with increasing flame retardancy and antistatic properties,a novel halogen-free intumescent flame retardant polypropylene composites（ ZIF-8/PP） were prepared using ZIF-8 type zeolite imidazolate framework material,ammonium polyphosphate（ APP） and pentaerythritol（ PER）. The effects of ZIF-8 on properties of polypropylene were studied with methods such as oxygen index,mechanical test,thermal gravimetric analysis,and resistance test. The results indicate that the addition of ZIF-8 can improve effectively the flame retardancy and antistatic properties of pure PP,with slight decreasing of the mechanical property,that when the mass fraction of ZIF-8 is 3%,the following properties of ZIF-8/PP expressed： the oxygen index reaches 28%,the surface resistivity decrease to 10^8Ω·cm（ resulting in the transition from insulator to anti-static body）,and the tensile strength of ZIF-8/PP is 21.2 MPa,and that ZIF-8 can increase the composites＇ amount of residual carbon,and the compact carbon layer with foam morphology formed in the melt surface inhibiting the flue gas,and improve the composites＇ thermal stability.