改性碳纳米管在不同补强填充体系丁腈橡胶中的应用研究

Application of Modified Carbon Nanotubes in NR with Different Reinforcing Filler System

研究改性碳纳米管(CNTs)在碳酸钙、白炭黑、炭黑N330补强填充体系丁腈橡胶(NBR)中的应用。结果表明:随着改性CNTs用量增大,碳酸钙补强填充体系和白炭黑补强填充体系NBR的MH-ML逐渐增大,t90缩短;炭黑N330补强填充体系NBR的MH-ML增大,t90延长;3种补强填充体系NBR的硬度、100%定伸应力、撕裂强度逐渐增大,碳酸钙补强填充体系NBR的拉伸强度提高,白炭黑补强填充体系和炭黑N330补强填充体系NBR的拉伸强度稍有降低;碳酸钙补强填充体系和白炭黑补强填充体系NBR的表面电阻率(ρs)和体积电阻率(ρv)变化较小,变化规律不明显;炭黑N330补强填充体系NBR的ρs和ρv较小,导电效果较好;3种补强填充体系NBR的导热性能均有所提高,炭黑N330补强填充体系胶料的热扩散率最大。

In this study, the modified carbon nanotubes （CNTs） were applied in NBR compounds which were filled by calcium carbonate, silica, and carbon black N330, respectively. It was found that with the increase of addition level of CNTs, the value of MH-ML of all three NBR compounds increased, and the t90 of the NBR compounds filled with calcium carbonate or silica was shortened, while the t90 of N330 filled NBR compounds was extended. The hardness, modulus at 100% elongation and tear strength of the NBR vulcanizates increasd gradually with more CNTs, the tensile strength of the vulcanizates with calcium carbonate increased, and the tensile strength of the vulcanizates with silica or N330 decreased slightly. The surface resistivity （Ps） and volume resistivity （Pv） didn＇t change much for the NBR with calcium carbonate or silica when the content of CNTs increased. However, the ps and Pv of N330 filled NBR decreased, showing good electrical conductivity. All compounds had increased thermal conductivity when the content of CNTs increased, and N330 filled NBR showed the highest thermal conductivity.