填料对端乙烯基室温硫化硅橡胶性能的影响

研究填料种类和用量对室温硫化乙烯基封端硅橡胶性能的影响。结果表明：热空气老化后，白炭黑、云母或蒙脱土填充硅橡胶的邵尔A型硬度和拉伸强度增大，拉断伸长率有一定程度的减小。白炭黑的加入能提高硅橡胶的热稳定性能。温度低于500 ℃时，随着云母用量的增大，硅橡胶的热稳定性能提高；温度高于500 ℃时，云母能够加速硅橡胶的降解。当蒙脱土的用量较小时，可以提高硅橡胶的热稳定性能，随着蒙脱土用量的增大，硅橡胶的热稳定性能下降。;The influence of filler type and addition level on the properties of room temperature vulcanized vinyl-terminated silicone rubber was investigated.The results showed that，after hot air aging，the Shore A hardness and tensile strength of silicone rubber filled with silica，mica or montmorillonite increased，and the elongation at break decreased.The thermal stability of silicone rubber was improved by adding silica.When temperature was below 500 ℃，as the addition level of mica increased，the thermal stability of silicone rubber was improved.When temperature was above 500 ℃，the degradation of silicone rubber was accelerated by adding mica.The thermal stability of silicone rubber was improved by adding small amount of montmorillonite.However，as the addition level of montmorillonite increased，the thermal stability of silicone rubber decreased