In this paper, cerium nitrate supported silica was prepared as a new type of catalytic synergist to improve the flame retardancy in polypropylene. When 1% of Ce(NO 3 ) 2 supported SiO 2 was added, the vertical combustion performance of UL-94 of polypropylene composites was improved to V-0, the limiting oxygen index (LOI) was increased to 33.5. From the thermogravimetric analysis (TGA), the residual carbon of C and D was increased by about 6% at high temperature compared with B. When adding supported catalyst, the heat release rate (HRR) and total heat release (THR) were significantly reduced according to the microscale combustion calorimetry (MCC), the HRR of sample E with 2% synergist was the lowest. The combustion behaviors of intumescent flame retardant sample B and sample D were analyzed by cone calorimeter test (CCT), the HRR of sample D with supported synergist was significantly reduced, and the PHRR decreased from 323 kW/m 2 to 264 kW/m 2 . The morphologies of the residue chars after vertical combustion of polypropylene composites observed by scanning electron microscopy (SEM) gave positive evidence that the supported synergist could catalyze the decomposition of intumescent flame retardants into carbon, which was the main reason for improving the flame retardancy of materials.

中文翻译：

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膨胀型阻燃剂负载型协同催化剂在聚丙烯中的作用研究

本文制备了硝酸铈负载的二氧化硅作为新型的催化增效剂，以提高聚丙烯的阻燃性。当添加1％的Ce（NO 3）2负载的SiO 2时，聚丙烯复合材料的UL-94垂直燃烧性能提高到V-0，极限氧指数（LOI）增加到33.5。根据热重分析（TGA），在高温下C和D的残留碳比B高约6％。当添加负载型催化剂时，放热率（HRR）和总放热（THR）显着降低根据微型燃烧量热法（MCC），具有2％增效剂的样品E的HRR最低。通过锥形量热仪（CCT）分析了膨胀型阻燃剂样品B和D的燃烧行为，带有协同增效剂的样品D的HRR显着降低，PHRR从323 kW / m 2降至264 kW / m 2。扫描电子显微镜（SEM）观察到的聚丙烯复合材料垂直燃烧后残余炭的形态，为负载型增效剂能催化膨胀型阻燃剂分解成碳提供了积极的证据，这是提高材料阻燃性的主要原因。 。