三位一体膨胀型烷基次膦酸盐对生物降解塑料PBS的阻燃与抗熔滴作用

摘要

A series of flame retardant polybutylene succinate (PBS) composites were prepared by homemade integrated intumescent alkyl phosphinate APTMP through melt blending method.Their flame retardance and anti-dripping properties were evaluated by limiting oxygen index (LOI),vertical burning test (UL 94) and micro-scale combustion calorimetry (MCC).Thermogravimetric (TG) analysis and scanning electron microscopy (SEM) were used to study the thermal properties and carbon residue morphology of the PBS composites.Thermogravimetric (TG) analysis coupled with infrared spectroscopy (TG-FTIR) was used to investigate the flame retardant mechanism of the composites.The study shows that APTMP can improve the flame retardancy and anti-dripping property of PBS obviously and depress the heat releasing during combustion.Compared with the pure sample,with the addition of flame retardants increased,the amount of residual carbon increases significantly at 700 ℃,forming a porous expanded carbon layer.This carbon layer is isolated from the combustion,showing a condensed phase flame retardant.When the mass ratio of APTMP/ PBS is 25/75,the composite exhibits optimal fire resistance with the LOI value of 28.4％ and the UL94 Ⅴ-0 ranking.%采用熔融共混技术,将自制的三位一体膨胀型烷基次膦酸盐APTMP引入到聚丁二酸丁二醇酯(PBS)中,制备了不同添加量的系列PBS复合材料;采用极限氧指数(加I)、微型量热(MCC)以及垂直燃烧(UL94)测试考查了复合材料的阻燃与抗熔滴效果;采用热重(TrG)、热重红外联用(TG-FTIR)和扫描电镜(SEM)研究了复合材料的热性能和阻燃机理.结果表明,APTMP可以显着提高PBS的阻燃性和抗滴落性,并抑制燃烧过程中的放热;随着阻燃剂添加量的增加,复合材料在700℃时的残炭量明显增加,抗熔滴效果也得到增强;SEM观察形成了多孔的膨胀碳层,表现出凝聚相阻燃,当添加量为25％时,复合材料已具备良好的阻燃性能,LOI为28.4％,垂直燃烧通过UL94 Ⅴ-0级.