聚烯烃用含硅阻燃剂的阻燃机理

采用TGA、FT-IR、SEM和TGA-FTIR联用等方法对新型含硅阻燃剂(SFR-H)的阻燃机理研究表明,SFR-H为凝聚相成炭型阻燃剂。在受热或燃烧过程中,SFR-H能迁移到材料表面降解生成高热氧稳定性的残留覆盖物,还对LLDPE基体具有催化成炭作用,能迅速在材料表面形成一层连续致密阻隔炭层,起着有效的隔热隔质作用,从而通过延缓内部材料热分解来提高材料的阻燃性能。

Flame Retardant Mechanism of Silicon-Containing Flame Retardant Applied in Polyolefin

By the methods of TGA,FT-IR,SEM and TGA-FT-IR,the investigation of flameretarding mechanism implied that SFR-H was a kind of halogen-free flame retardant acting in condensation phase by forming compact charred layer.At the elevated temperature or burning,SFR-H immigrates to the surface of material rapidly and generates some products with excellent thermo-oxidative stability after thermal degradation.Moreover,the intermediate products generated during thermal decomposition of SFR-H catalyze the carbonization of LLDPE at the high temperature.Therefore,a continuous compact charred layer with high physical strength forms on the burning surface quickly acting as physical barrier against heat,oxygen and combustible products,which inhibits the degradation of the underlying material and improves the flame-retardancy of material.