聚磷酸铵/季戊四醇复合膨胀型阻燃剂阻燃ABS的研究

Study on Intumescent Flame Retardant APP/PER Retarded ABS

通过热重分析、扫描电子显微镜和氧指数等研究了由聚磷酸铵与季戊四醇组成的膨胀型阻燃剂(IFR)对ABS的阻燃作用。与传统的含卤阻燃ABS相比,热失重分析显示,IFR的加入使体系的残炭量显著增加,650℃时ABS的残炭量由不加IFR时的1.9%增至21.32%。扫描电子显微镜观测发现,经IFR阻燃的ABS在燃烧时形成了由无数封闭孔洞构成的蓬松焦化炭层,表明IFR对ABS具有良好的膨胀阻燃效果。在IFR含量为30%时,ABS的氧指数可达27.4%。

The effect of intumescent flame retardant (IFR) composed of ammonium polyphosphate (APP) and pentaerythritol (PER) on ABS was studied using thermal gravimetric analysis (TGA), scanning electron microscope (SEM), and limited oxygen index (LOI), etc. TGA analysis indicated that the amount of charred residue at 650 achieved 21.3 %, which in contrast with 1.9 % for ABS resins containing traditional halogen flame retardants. SEM observation revealed that puffy coking charred layers were formed by lots of closed bubbles in ABS specimen filled with IFR after burning. When content of IFR was 30 %, an LOI value of 27.4 % for ABS was obtained.