摘要
基于丁腈橡胶(NBR)与溴化丁基橡胶(BIIR)两种基体橡胶共混,制备了可用于建筑高阻尼隔震支座的NBR/BIIR复合橡胶材料。采用流变仪、万能试验机及动态机械分析仪等测试手段分析了橡胶材料的硫化特性、力学性能及阻尼性能。结果表明:采用低硫高促硫化体系的复合橡胶材料具有较好的硫化平坦性。由于热力学不相容性和两相硫化速度的差异,导致两相的交联密度不同及界面结合力弱,降低了复合材料的力学性能。随着BIIR含量的增加,tanδ-T曲线出现两个峰值且分别向更低温和更高温方向外延,大大扩宽了复合材料的有效温域,当共混物NBR/BIIR的比例为30/70时,有效温域达85.60℃。采用热空气老化实验方法进一步研究表明,复合材料力学性能和阻尼性能下降不明显,具有良好的抗老化稳定性。所制备的复合材料具有良好的综合力学性能,研究结果可为制备建筑高阻尼隔震支座复合橡胶材料提供参考。
BIIR/NBR composite rubber material used for high damping isolation bearings was prepared by Nitrile rubber(NBR) and brominated butyl rubber(BIIR) two matrix rubbers. The vulcanizing, mechanical and damping properties of the rubber material were analyzed using rheometer, universal testing machine and dynamic mechanical analyzer. Results showed that: with low sulfur and high accelerator vulcanization system, rubber material had better vulcanization flatness. Due to thermodynamic incompatibility and differences in two-phase curing rate, crosslinking densities of the two phases were different and interface bonding strength was weak in the blends, which reduced the mechanical properties of the composite. With the increase of BIIR content, the tanδ-T curves of the blends presented two peaks and extended to the lower and higher temperature respectively,which greatly expanded the effective temperature range of the composites. When the ratio of NBR/BIIR was30/70, the effective temperature range reached 85.60 degrees. The further study of hot air aging method showed that the degradation of mechanical properties and damping properties of the composite is not obvious, and the composite has good anti-aging stability. The composite material has good comprehensive mechanical properties,and the study results can provide references for the preparation of composite rubber material in high damping isolation bearings.
作者
雷拓
张永旺
杨永睿
曹国绒
Lei Tuo;Zhang Yongwang;Yang Yongrui;Cao Guorong(Chang’an University,Xi’an 710061,China)
出处
《土木工程学报》
EI
CSCD
北大核心
2018年第A01期1-7,共7页
China Civil Engineering Journal
基金
陕西省自然科学基金(2016JM5037)
