杜仲橡胶在全钢载重子午线轮胎胎面胶中的应用

Application of Eucommia Ulmoides Gum in Tread Compound of TBR Tire

在全钢载重子午线轮胎胎面胶中直接添加5~15份杜仲橡胶或用杜仲橡胶等量替代天然橡胶(NR),研究其对胎面胶性能的影响。结果表明:在胎面胶中直接添加杜仲橡胶,胶料的门尼粘度增大,门尼焦烧时间略有延长;且随着杜仲橡胶用量的增大,t_(90)略有延长,F_(max)-FL呈减小趋势,硫化胶的邵尔A型硬度、100%定伸应力和300%定伸应力呈减小趋势,抗切割指数先减小后增大,拉伸强度和回弹值变化不大,拉断伸长率呈增大趋势,胶料0和25℃时的损耗因子(tanδ)先增大后减小,但均大于未添加杜仲橡胶的胶料,60℃时的tanδ变化不大;将杜仲橡胶等量替代NR,随着杜仲橡胶用量的增大,胶料的门尼粘度呈增大趋势,t 90基本呈延长趋势,F_(max)-F_(L)先增大后减小,硫化胶的硬度、100%定伸应力、300%定伸应力呈减小趋势,拉断伸长率、回弹值、DIN磨耗指数和抗切割指数呈增大趋势,拉伸强度变化较小,胶料0℃时的tanδ增大,60℃时的tanδ减小,表明胶料的抗湿滑性能提高,滚动阻力下降。

The effect of eucommia ulmoides gum on the properties of tread compound was studied,by directly adding 5~15 phr eucommia ulmoides gum to the tread compound of truck and bus radial(TBR)tire,or replacing part of the natural rubber(NR)in the original tread formulation with equal amount of eucommia ulmoides gum.The results showed that,by directly adding eucommia ulmoides gum to the tread compound,the Mooney viscosity of the compound increased,and the Mooney scorch time was slightly prolonged.In addition,with the increase of the amount of eucommia ulmoides gum,t_(90) was prolonged slightly,F_(max)-F_(L) decreased,the hardness,modulus at 100%elongation,modulus at 300%elongation of the vulcanizate tended to decrease,cutting resistance index decreased at first and then increased,the tensile strength and resilience changed little,the elongation at break increased,the loss factor(tanδ)at 0 and 25℃of the compound increased at first and then decreased,but both were larger than the compound without eucommia ulmoides gum,and tanδat 60℃changed little.By using the same amount of eucommia ulmoides gum to replace part of the NR in the compound,with the increase of the amount of eucommia ulmoides gum,the Mooney viscosity of the compound increased,t90 prolonged,F_(max)-F_(L) increased at first and then decreased,the hardness,modulus at 100%elongation,modulus at 300%elongation of the vulcanizate tended to decrease,the elongation at break,resilience,DIN abrasion index and cutting resistance index tended to increase,the tensile strength changed little,tanδat 0℃of the compound increased,tanδat 60℃decreased,which indicated the wet skid resistance of the compound improved,and rolling resistance decreased.