采用测量极限氧指数(LOI)和锥形量热仪动态燃烧两种方法评价了含硅阻燃剂(SFR-H)与高聚磷酸铵/三聚氰胺氰尿酸盐(APP/MCA)膨胀阻燃体系在聚乙烯基体中的协同阻燃性,并通过红外光谱(FT-IR)、X射线衍射(WAXD)和扫描电镜(SEM)分析炭层结构和成分来研究其协同阻燃机理.研究表明,SFR-H/APP/MCA协同阻燃体系可明显提高聚乙烯的LOI值和降低燃烧热释放速率,具有较好的协同阻燃性,两者在燃烧过程中一起热氧化分解,形成陶瓷状含硅、硼、磷元素的化合物,对表面膨胀炭层起着增强作用,同时也提高了膨胀炭层的热氧稳定性和阻隔性能,从而提高了阻燃效果.
By the methods of limited oxygen index (LOI), cone calorimeter, Fourier transform infrared spectroscopic(FT-IR), scanning electron microscope (SEM) and wide angle X-ray diffraction (WAXD), the synergistic flame-retarding property and mechanism of a silicon-containing flame retardant (SFR-H) and ammonium phosphate/melamine cyanurate (APP/MCA) intumescent flame-retardant system were studied. The results imply that SFR-H/APP/MCA synergistic flame-retarding system obviously improves the LOI value and decreases heat release rate of linear low density polyethylene(LLDPE) during combustion. SFR-H exhibits good synergistic flame-retarding effect with APP/MCA intumescent flame-retardant system. They degraded to generate ceramic compounds containing silicon, boron and phosphorus elements during combustion, which improves the flame-retarding effect by reinforcing the thermo-oxidative stability, mechanical property and insulating effect of continuous intumescent charred layer.
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