基于储存稳定性的橡胶改性沥青制备工艺

Preparation Process of Rubber Modified Asphalt Based on Storage Stability

为了制备储存稳定性良好的橡胶改性沥青,基于高温混炼工艺,使用聚苯乙烯-聚丁二烯-聚苯乙烯嵌段聚合物(SBS)、芳烃油、辛烯聚合物橡胶反应剂(TOR)、稳定剂与橡胶粉对基质沥青进行复合改性。提出了橡胶改性沥青的制备方法,分析了改性剂对沥青常规性能和流变特性的影响,并通过荧光试验观察改性剂在沥青中的分散效果。研究结果表明:添加质量分数为25%的40目(380μm)胶粉可以明显提高沥青的高温性能;180℃下剪切60~90 min后溶胀发育60 min可以得到稳定性良好的橡胶改性沥青;加入相容剂和稳定剂可以提高胶粉的溶胀与分散程度,改性剂之间对沥青性能的影响存在协同作用;复合改性沥青具有良好的弹性恢复能力和高温抗变形性能;橡胶粉、SBS在沥青中的溶胀程度和分散均匀性是影响沥青常规性能和储存稳定性的直接因素。

To prepare rubber modified asphalt with high storage stability,asphalt was composite modified with SBS,aromatic oil,TOR,stabilizer and rubber powder based on high temperature mixing process.The preparation method of rubber modified asphalt was proposed.The influence of modifiers on the general performance and rheological properties of asphalt were analyzed.The dispersion effect of the modifier in the asphalt was observed by the fluorescence test.The results show that the high temperature performance of asphalt is improved by adding 40 mesh(380μm)rubber powder with a mass fraction of 25%.Storage stability of rubber asphalt is improved by shearing at 180℃for 60 min to 90 min and then swelling 60 min.The degree of swelling and dispersion of rubber powder are improved by adding compatibilizers and stabilizers,and different modifiers have a synergistic effect on the asphalt performance.Composite modified asphalt has good elastic recovery ability and deformation resistance in high temperatures.The swelling degree and dispersion uniformity of rubber powder and SBS in asphalt are the direct factors to affect the general performance and storage stability of asphalt.