Effect of ZnO nanoparticles doped graphene on static and dynamic mechanical properties of natural rubber composites

In this work, effect of ZnO nanoparticles doped graphene (Nano-ZnO–GE) on static and dynamic mechanical properties of natural rubber composites were studied. Nano-ZnO–GE was synthesized by sol–gel method and thermal treatment. With the incorporation of nano-ZnO–GE into the matrix, the mechanical properties of NR nanocomposite significantly improved over that of NR composite containing with 5 phr of conventional-ZnO. The results demonstrated that the presence of nano-ZnO on the surface of graphene sheets not only conduces to suppressing aggregation of graphene sheets but also acts as a more efficient cure-activator in vulcanization process, with the formation of excellent crosslinked network at low nano-ZnO–GE content. This work also showed that NR/Nano-ZnO–GE nanocomposites exhibited higher wet grip property and lower rolling resistance compared with NR/Conventional-ZnO composite, which makes nano-ZnO–GE very competitive for the green tire application as a substitute of conventional-ZnO, enlarging versatile practical application to prepare high-performance rubber nanocomposites.     

7.50－16LT 8PR加深花纹轻型载重斜交轮胎的设计

介绍7.50-16LT 8PR加深花纹轻型载重斜交轮胎的设计。结构设计:外直径825 mm,断面宽191 mm,行驶面宽度163 mm,行驶面弧度高12 mm,胎圈着合直径406 mm,断面水平轴位置(H_1/H_2)0.806 0,胎面花纹深度15 mm,花纹饱和度58.1%,花纹周节数24。施工设计:胎面胶采用高耐磨配方,胎体采用4层2100dtex/2V_1锦纶6浸胶帘布,缓冲层采用1层1400dtex/2V_2锦纶6浸胶帘布,胎圈采用单钢丝圈结构,钢丝圈采用Φ0.96 mm的19~#镀青铜高强度回火胎圈钢丝。成型采用半自动压辊包边成型机,半芯轮式成型机头;硫化采用立式硫化罐。成品轮胎试验结果表明,轮胎充气外缘尺寸符合设计要求,物理性能和强度性能符合国家标准要求。