Qin Gang, Shen Zhongshuo, Yu Yongqiang, Fan Lidan, Cao Hongwei, Yin Chaowei
School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China.
Henan Key Laboratory of Underground Engineering Disaster Prevention, Henan Polytechnic University, Jiaozuo 454000, China.
Materials (Basel). 2019 Aug 30;12(17):2796. doi: 10.3390/ma12172796.
Due to the rapid growth of the electric power system, the silicone rubber composite insulator is so widely employed around the world. However, the aging damage and decommission of it inevitably generates plenty of waste silicone rubber. It takes up large amounts of land for non-degradation, which is becoming a serious environmental issue. In this paper, the effort has been made to reuse the silicone rubber of composite insulator by peeling, breaking and adding it into the cement mortar to partly replace river sand by 5%, 10%, 15%, 20% and 30% in volume. Moreover, the surface modification of silicone rubber particles with HO and KOH is explored to improve hydrophilicity. The mechanical strength of silicone rubber mortar and modified silicone rubber mortar are measured in detail, and the effects of particle size, content and modification of silicone rubber on the properties of mortar are investigated. This study shows that at least a 5% addition of silicone rubber can reduce the strengths, while the 15% addition is obviously favorable for increasing the toughness. Furthermore, the mortar strength gets promoted due to the surface modification. Lastly, the superior thermal insulation and noise reduction of the mortar are obtained as the addition of silicone rubber particles, and an equation between dry apparent density and thermal conductivity of mortar has been developed.
由于电力系统的快速发展，硅橡胶复合绝缘子在全球范围内得到了广泛应用。然而，其老化损坏和退役不可避免地产生大量废弃硅橡胶。这些废弃硅橡胶因不可降解而占用大量土地，正成为一个严重的环境问题。本文致力于通过将复合绝缘子的硅橡胶进行剥离、破碎并添加到水泥砂浆中，以体积分数5%、10%、15%、20%和30%的比例部分替代河砂，实现对复合绝缘子硅橡胶的再利用。此外，还探索了用HO和KOH对硅橡胶颗粒进行表面改性以提高亲水性。详细测量了硅橡胶砂浆和改性硅橡胶砂浆的力学强度，研究了硅橡胶的粒径、含量和改性对砂浆性能的影响。本研究表明，至少添加5%的硅橡胶会降低强度，而添加15%明显有利于提高韧性。此外，表面改性使砂浆强度得到提升。最后，随着硅橡胶颗粒的添加，砂浆获得了优异的保温和降噪性能，并建立了砂浆干表观密度与导热系数之间的方程。
