核壳橡胶粒子改性沥青的高温贮存稳定性

主要采用乳液接枝聚合技术,合成核壳结构的聚丁二烯橡胶粒子接枝苯乙烯及少量沥青壳层结构的聚合物,共混改性基质沥青.通过考察核壳橡胶粒子改性沥青高温离析上下层的软化点及差值,DSC分析,以及内部分散形态结构,得到了高温贮存稳定的改性沥青.此时,改性沥青的软化点明显提高,离析差不超过1℃;沥青与核壳橡胶粒子发生作用使能产生吸热峰的组分向低温发生偏移,且峰值减小;橡胶相以区域网络结构均匀分散.

High-Temperature Storage Stability of Core-Shell Rubber Particles Modified Asphalt

Core-shell PB-g-PS/asphalt is synthesized by grafting styrene and emulsified asphalt onto polybutadiene using the emulsion grafting/polymerizing technology. Then, the core-shell rubber particles are blended with asphalt to modify it with high-temperature storage stability provided. Some properties of the modified asphalt are investigated, such as the differences between the top and bottom layers of modified asphalt at the softening points due to high-temperature segregation, what the differential scanning calorimetric (DSC) analysis shows and the morphologies and homogeneous dispersion of rubber phases in the state of domain network structure In the modified asphalt the number of softening points increases obviously and the temperature difference due to segregation is lower than 1°C. The reaction between asphalt and core-shell rubber particle enables the components which are available to endothermic peak to shift to lower temperature with peak value decreased.