阻燃填料对陶瓷化耐火硅橡胶性能的影响

Effect of Flame-Retardant Fillers on Properties of Ceramicized Refractory Silicone Rubber

为探究阻燃填料对陶瓷化耐火硅橡胶性能的影响,以硅橡胶为基材,硼酸锌和玻璃粉为成瓷填料,不同比例的氢氧化铝和氢氧化镁为阻燃填料,制备了陶瓷化耐火硅橡胶。并对陶瓷化硅橡胶的硬度、拉伸性能、撕破性能、电气绝缘性能及耐火性能进行了测试分析,结果表明:相较于普通硅橡胶,陶瓷化硅橡胶的邵氏硬度提高了26.3%;拉伸性能有不同程度的降低,但仍可以满足电线电缆产品标准中的拉伸性能要求;撕破性能最大增幅为74%;电气绝缘性能有一定程度的降低;陶瓷化硅橡胶具有良好的耐火性能,且在阻燃填料相同质量份数下,氢氧化镁比氢氧化铝更有利于陶瓷化硅橡胶的阻燃性能的提高,其极限氧指数相较于普通硅橡胶提高了41.1%。

In order to investigate the effect of flame-retardant fillers on the properties of ceramicized refractory silicone rubber,ceramicized refractory silicone rubber was prepared with silicon rubber as the base material,zinc borate and glass powder as the ceramic filler,and different proportions of magnesium hydroxide and aluminum hydroxide as the flame retardant fillers.The hardness,tensile property,tear property,electrical insulation property and fire resistance of ceramicized silicone rubber were tested and analyzed.The results showed that the Shore hardness of ceramicized silicone rubber was increased by 26.3%compared with that of conventional silicone rubber.The tensile properties reduced by different degrees,but the tensile properties could still meet the requirements of wire and cable product standards.The maximum increase of tearing property was 74%.Electrical insulation performance had a certain degree decrease.Ceramic silicone rubber had good fire resistance,with the same mass fraction of flame retardant,magnesium hydroxide was more beneficial to the improvement of flame retardant resistance for ceramic silicone rubber than aluminum hydroxide,its limiting oxygen index was 41.1%higher than that of conventional silicone rubber.