基于乘用车轮胎胎面胶粉的再生橡胶的制备及性能

通过力化学再生法制备了以废轮胎胶粉为原料的再生橡胶，研究了不同活化剂420用量对再生橡胶性能的影响，测试表明：再生橡胶含硫键断裂生成了硫自由基，随着活化剂含量的增加，再生橡胶的邵氏硬度和交联密度持续降低；拉伸强度、断裂延伸率和凝胶含量均先升高后降低，在活化剂用量为0.9 phr时，拉伸强度和断裂延伸率最大，再生橡胶的凝胶含量最大为19.7%。 微观形貌发现，废轮胎胎面胶粉的颗粒较为分散，再生橡胶的结构颗粒相互粘连，孔洞和缺陷较多，再生橡胶的门尼黏度随着活化剂含量的增加而降低。 综合来看，活化剂420的最佳含量为0.9 phr，再生橡胶各项性能最优。

Preparation and Properties of Reclaimed Rubber Based on Passenger Car Tire Tread Powder

Reclaimed rubbers are prepared by mechanochemical regeneration method using waste tire rubber powder as raw materials. The effect of different dosages of activator 420 on the properties of reclaimed rubbers is studied. With increasing the activator content， the Shore hardness and crosslinking density of recycled rubber continue to decrease， while the tensile strength， elongation at break and gel content first increase and then decrease. When the activator content is 0.9 phr， the tensile strength and the maximum elongation at break reach the maximal and the maximum gel content of the recycled rubber is 19.7%. The microscopic morphology shows that the particles of the rubber powder of the waste tire tread are relatively dispersed. The structural particles of the recycled rubber are adhered to each other， and there are many holes and defects. The Mooney viscosity decreases with increasingof the activator content. On the whole， the optimum content of activator 420 is 0.9 phr， and the properties of recycled rubber are the best.