北京化工大学 北京市新型高分子材料制备与加工重点实验室 北京 100029
重载条件下，胎面胶的力学性能直接影响飞机轮胎的耐磨性。利用TAS-300轮胎磨耗模拟试验机，设定转速800 r/min(15 Hz)以及保持总填料用量60份，探究了重载条件（>1.5 MPa）下不同炭黑/白炭黑并用比对天然橡胶(NR)/反式聚异戊二烯橡胶(TPI)复合材料耐磨性的影响，并结合硫化胶静、动态性能进行分析。结果表明：随载荷增大和白炭黑用量的增加，胶料的磨耗量逐渐增加；纯炭黑体系的硫化胶耐磨性最好，这主要归因于其高的300%定伸应力和高硬度以及在高载荷下形变小。橡胶加工分析仪测试结果表明：随白炭黑用量增加，硫化胶的“Payne效应”逐渐减弱，损耗因子峰逐渐降低；压缩疲劳生热和屈挠疲劳测试结果表明：与纯炭黑体系相比，炭黑/白炭黑并用比为40/20的硫化胶的动态生热降低了27.5%，出现一级和六级裂纹的疲劳寿命分别提高了74%和72%。综合来看，硬度和300%定伸应力的降低是导致耐磨性能下降的主要原因。磨屑的红外光谱分析结果表明：硫化胶的磨耗是以机械力作用下的热氧降解磨耗为主。
Under heavy load conditions, the mechanical strength of tread rubber directly affects the wear performance of aircraft tires. Keeping the total filler amount at 60 parts, the influence of different carbon black/silica ratios on wear resistance of natural rubber (NR)/trans-polyisoprene rubber (TPI) composites under heavy load (> 1.5 MPa) was investigate by using TAS-300 tire wear simulation tester with a rotational speed of 800 r/min (15 Hz), and the static and dynamic properties of vulcanizates were analyzed. The results show that the abrasion of rubber increases with the increase of the load and the amount of silica. The vulcanizate of pure carbon black system exhibits the best wear resistance, which is mainly due to its high stress at 300% and high hardness, the deformation is small under high load. The test results of the rubber processing analyzer show that with the increase of the amount of silica, the "Payne effect" of the vulcanizates and the peak of the loss factor gradually decrease. Compression fatigue heat generation and flexural fatigue test results show that, compared with pure carbon black system, the dynamic heat generation of vulcanizate with a carbon black/silica ratio of 40/20 is reduced by 27.5%, and the fatigue life of grade 1 and grade 6 cracks is increased by 74% and 72%, respectively. In general, the decrease of hardness and stress at 300% is the main reason for the decline of wear resistance. However, the hardness and of vulcanizates are decreased, which leads to the decline of wear resistance. The results of FT-IR of the wear debris show that the wear of the vulcanizates is mainly caused by thermal oxygen degradation under mechanical force.