环氧化天然橡胶对天然橡胶/丁腈橡胶阻尼材料性能的影响

Effect of Epoxidized Natural Rubber on Properties of NR/NBR Damping Material

研究环氧化天然橡胶(ENR-40)对天然橡胶(NR)/丁腈橡胶(NBR)阻尼材料综合性能的影响。结果表明:随着ENR-40用量的增大,并用胶的最大转矩、最小转矩及两者之差增大,焦烧时间和正硫化时间略延长;拉伸强度和拉断伸长率先增大后略有减小,撕裂强度和定伸应力逐渐增大,硬度不变,回弹值略有减小;压缩永久变形和疲劳温升逐渐减小,滞后能量密度和阻尼系数增大;DMA测试结果显示,两相损耗峰靠近,NR的损耗因子峰值和损耗模量减小,NBR的损耗因子峰值和损耗模量增大。

The effects of epoxidized natural rubber（ENR-40） on the comprehensive properties of natural rubber（NR）/nitrile butadiene rubber（NBR） damping material were investigated. The results showed that,as the addition level of ENR-40 increased,the maximum torque,minimum torque and their difference value of the blend increased,and the scorch time and optimum curing time were slightly extended. The tensile strength and elongation at break of the blend increased at first and then decreased,the tear strength and modulus gradually increased,the hardness remained constant,and rebound value decreased slightly. Moreover,the compression permanent set and fatigue temperature rise decreased,and the hysteresis energy density and damping coefficient increased. DMA test results showed the loss peaks of two phases shifted toward each other,the peak value of loss factor and loss modulus of NR gradually decreased,and the peak value of loss factor and loss modulus of NBR increased.