电缆用陶瓷化硅橡胶复合带性能的研究

摘要/Abstract

摘要： 采用熔融共混法制备了可陶瓷化硅橡胶复合材料,对其进行了拉伸性能、阻燃性能和体积电阻率测试。结果表明:随着助熔剂用量的增加,复合材料的拉伸性能下降,由于引入了更多的杂质离子,复合材料的电导率提升;SiO₂的加入增大了填料网络结构的紧密性,复合材料的弹性形变和拉伸强度增大,载流子的迁移受到了阻碍,材料的体积电阻率提高;多种无机填料的协同作用使复合材料具有较好的阻燃性能,当玻璃粉/SiO₂填充质量份数为40/40时,材料的氧指数最高,热释放速率峰值和烟生成速率峰值最低,火灾危险性较小;EVA(乙烯-醋酸乙烯共聚物)与硅橡胶的共混提高了复合材料的刚性和塑性形变,填料的分散状态发生改变,局部堆积的填料充当了杂质离子,导致材料的电阻率降低。

关键词: 陶瓷化耐火带, 助熔剂, 拉伸性能, 氧指数, 体积电阻率

Abstract: Ceramizable silicone rubber composites were prepared by the melting blending method. The tensile properties, flame retardant property, and volume resistivity of the silicone rubber composites were tested. The results show that the tensile property of composites decline with the increasing flux amount. The introduction of more impurity ions improves the conductivity of the composites. The addition of SiO₂ enhances the compactness of the filler network structure, and the elastic deformation and the tensile strength of the composites are also increased. The migration of carriers is hindered, which promotes the increase of volume resistivity of composites. Because of the synergistic effect of a variety of inorganic fillers, composite materials have a better flame retardant property. When the part of weight of glass powder and SiO₂ is 40∶40, the oxygen index of the composites is the highest, meanwhile, the peak heat release rate and the peak smoke production rate are the lowest, and the fire risk is smaller. The blending of EVA and silicone rubber improves the rigidity and plastic deformation of the composites, and also changes the dispersion state of the fillers. The partially stacked fillers act as impurity ions, which causing the resistivity of the materials to decrease.

Key words: ceramizable resistant tape, flux, tensile property, oxygen index, volume resistivity

中图分类号:

TM215

王新古, 孙光华, 常锦涛, 李秀峰. 电缆用陶瓷化硅橡胶复合带性能的研究[J]. 硅酸盐通报, 2021, 40(6): 2096-2103.

WANG Xingu, SUN Guanghua, CHANG Jintao, LI Xiufeng. Performance of Ceramizable Silicon Rubber Composite Tape for Cable[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(6): 2096-2103.

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