壳聚糖包覆三聚磷酸钠微胶囊-可膨胀石墨协同阻燃天然/杜仲橡胶

Chitosan coated sodium triphosphate microcapsules-expandable graphite synergistic flame retardant nature / eucommia rubber

摘要:

以三聚磷酸钠（STPP）为芯材，壳聚糖（CS）为壁材，通过离子凝胶法成功制备阻燃微胶囊CS@STPP。采用扫描电镜（SEM）、傅里叶红外光谱（FTIR）对所制备的微胶囊的表面形貌、化学结构进行表征。将CS@STPP与EG以一定比例添加到天然（NR）/杜仲（EUG）并用橡胶中，探究CS@STPP与可膨胀石墨（EG）之间的协同作用对NR/EUG并用橡胶阻燃性能影响。采用极限氧指数（LOI）、垂直燃烧测试（UL-94）、锥形量热（CCT）等测试手段对FRBR阻燃性能进行分析。结果表明FRBR的燃烧性能显著降低，LOI值达到28.4%，UL-94达到V-0等级，最大热释放速率下降30%。

Abstract:

Using sodium tripolyphosphate (STPP) as core material and chitosan (CS) as wall material, the flame retardant microcapsules CS@STPP were successfully prepared by ionic gel method. The surface morphology and chemical structure of the microcapsules were characterized by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). The effect of synergistic effect between CS@STPP and expandable graphite (EG) on flame retardant performance of NR/EUG rubber was investigated by adding CS@STPP and EG to natural (NR)/ EUG rubber in a certain proportion. The flame retardancy of FRBR was analyzed by limiting oxygen index (LOI), vertical combustion test (UL-94) and cone calorimetry (CCT). The results showed that the combustion performance of FRBR decreased significantly,LOI reached 28.4%,UL-94 reached V-0 grade, and the maximum heat release rate decreased by 30%.