SCZB用量对PE陶瓷化阻燃性能的影响

Effect of SCZB Dosage on Flame Retardancy of PE Ceramization

以高岭土为成瓷填料,自制的陶瓷化硼酸辞(SCZB)为低温助熔剂,制备了一种可低温陶瓷化的聚乙烯材料。研究了不同含量的低温助熔剂(SCZB)对聚乙烯陶瓷化阻燃性能和熔滴性能的影响,同时,采用X射线衍射(XRD)、扫描电子显微铣(SEM)和偏光显微镜(POM)对聚乙烯陶瓷化的结构进行分析和表征。结果表明,随着低温助熔剂(SCZB)份数的增加,聚乙烯的氧指数明显提高,熔滴数逐渐减少,直至样条在燃烧1min内无熔滴滴落;聚乙烯在处于明火或者高温环境时,首先受热发生分解,随着温度升高,低温助熔剂SCZB发生熔融,形成液相,渗透到高岭土、其他填料及聚乙烯分解的残余物之间,重新结晶,并把各组分充分的黏结在一起,形成液相桥接。当烧蚀温度达到800℃时,形成具有一定支律性的低温助熔剂SCZB添加量为30份时,聚乙烯材料具有最佳的综合性能,陶瓷化效果最显著。

A low temperature ceramizable polyethylene material was prepared by using kaolin as ceramic filler and self- made ceramized zinc borate (SCZB) as low temperature flux.The effects of low temperature flux (SCZB) with different content on the flame retardancy and droplet properties of ceramized polyethylene were studied.The structure of ceramized polyethylene was analyzed and characterized by X-ray diffraction (XRD),scanning electron microscopy (SEM) and polarizing microscope (POM).The results showed that the oxygen index of polyethylene increases with the increase of the fraction of low temperature flux (SCZB),and the number of droplets decreases gradually until the spline has no droplets within one minute of combustion;when polyethylene was first decomposed by heat in open fire or at high temperature.With the increase of temperature,low-temperature flux SCZB melted and formed liquid phase.It penetrated into kaolin,other fillers and the residues of polyethylene decomposition,recrystallized and bonded the components together sufficiently to form liquid phase bridging.When the ablation temperature reached 800,a hard and continuous ceramic protective layer with certain support was formed,which played a flame retardant role.The results showed that the ceramic effect of polyethylene was good.When 30 phr of kaolim and low temperature flux SCZB were added,the polyethylene material had the best comprehensive properties and the ceramization effect was the most remarkable.