TBIR应用于航空胎侧胶的热氧老化性能

研究了反式-1,4-丁二烯-异戊二烯共聚橡胶(TBIR)应用于航空轮胎胎侧胶天然橡胶(NR)/顺丁橡胶(BR)/TBIR]的耐热氧老化性能. 结果表明, 与NR/BR硫化胶相比, 10~20份质量的TBIR取代BR后, NR/BR/TBIR硫化胶的交联密度明显提高, 压缩温升降低2.2~3.4 ℃, 耐屈挠疲劳性能提高约100%, 填料分散性改善, 填料团聚体体尺寸减小, 拉伸性能基本不变. 随热氧老化时间延长, 硫化胶的交联密度先增加后降低, 并用TBIR的硫化胶交联密度在老化48 h后趋于平缓. 与NR/BR相比, 老化后的NR/BR/TBIR硫化胶生热最低, 耐屈挠疲劳性最高.

Thermal-oxidative Aging Performance of TBIR Modified NR/BR Vulcanizates in Aircraft Tire Sidewall

The thermal-oxidative aging performance of a new generation synthetic rubber trans-1,4-butadiene-isoprene copolymer rubber(TBIR)in NR/BR vulcanizates was studied.Compared with the NR/BR vulcanizates,the crosslinking density of NR/BR/TBIR vulcanizates with 10 to 20 per hundreds of rubber(phr)TBIR improved significantly as while as the tensile properties changed little.The heat build-up reduced by 2.2-3.4℃and the flexural fatigue resis-tance increased about 100%.The filler dispersion improved and the average aggregate size of the filler reduced.With the increasing of thermal-oxidative aging time,the crosslinking density of vulcanizates increased and then decreased.The crosslinking density of NR/BR/TBIR vulcanizates remained unchanged after 48 h.With the increasing of aging time,the heat build-up first decreased and then increased and NR/BR/TBIR vulcanizates has the lowest heat build-up value.The flexural fatigue lifetime of NR/BR/TBIR was better than NR/BR vulcanizates.