CSM/EVA复合材料的阻燃与伸缩性能研究

Development of heat shrinkable and flame-retardant EVA/CSM blends

采用机械共混法制备了EVA/CSM复合材料。系统地研究了EVA与CSM的混合比率、CSM交联及不同阻燃体系对复合材料阻燃性质的影响。结果表明,掺杂阻燃剂之后,复合材料都具有很好的阻燃性能,其中使用Sb2O3/氯乙醇混合阻燃体系,阻燃效果最好,且复合材料交联后,阻燃性能会进一步增强。同时研究了各种因素,如交联、混合比率和处理温度对复合材料收缩率的影响。当CSM含量较高或拉伸温度处于室温,收缩率都较好;而交联前,加入阻燃剂会使复合材料收缩性能降低;反之,交联后使之增加。

The present article is eoncerned with a study of a kind of plastie （EVA） blended with elastomer （CSM） and the effects of the blend. As is found in our experiments, the flame-retardancy would be enhanced when the elastomer phase was crosslinked. And the highest flame-retardancy can be obtained in the presence of Sb203/Chlorohor. Additive flame-retardants prove to hamper the heat-shrinkability of the blend to some extent, which depends on the various factors, such as blending composition, temperature, curing, etc, The depression of shrinkability in the presence of flame-retarding agents would be less for the cured sample and elastomer-rich blend when compared with the uncured and plastic-rich blends, respectively. Tberefire, it can be found that with the increase in the cure time and elastomer content tile shrinkability and the flame-retardancy would be enhanced. At high temperatures, the sacrifice of the shrinkability in the presence of flame retardants would also increase, for some particular blends. Parameters such as blending composition, curing time and elevated temperature, all may affect the micrestructure of the blend, and the control of the shrinkage property of the blends. Lower shrinkability has thus been tound due to the interference of flame-retarding agents. For cured samples and elastomer-rich blends, the flame-retardancy would become greater and the sacrifice of shrinkability would thus be weakened. It is also found that crystallinity of the blend also proves to play a role in determining the fiame-retardancy as well as the heat shfinkability. The desired communication of heat shrinkability and fiame-retardancy of the thermoplastic/elastomer blends can thus be obtained through optimization of the above parameters given the correlation of shrinkability and flame-retardaney with various parameters.