基于红外光谱的多聚磷酸复配 SBS 改性沥青微观机理研究

以基质沥青、改性剂、抽出油、稳定剂、多聚磷酸(PPA)、邻苯二甲酸二丁酯(DBP)为原材料,采用高速剪切机制备了PPA复配SBS改性沥青,通过红外光谱试验,探讨了其微观机理。结果表明:(1)基质沥青的官能团因其性质的不同差异较大,SK90#基质沥青较其他两种基质沥青更易于与多聚磷酸发生化学反应。(2)随着PPA掺量的增加,沥青中IS=O对应的极性亚砜官能团会产生偶极,并与沥青中的其他偶极发生相互作用和关联,进而提高沥青的黏度。(3)随着PPA掺量的增加,SBS颗粒大小逐渐统一,颗粒结构逐渐分布均匀,融为一起形成网络结构,显著提高了SBS改性沥青的高温存储稳定性。

Study on microscopic mechanism of polyphosphoric acid compound SBS modified asphalt based on infrared Spectroscopy

PPA compound SBS modified asphalt was prepared by high speed shearing machine using matrix asphalt, modifier, extraction oil, stabilizer, polyphosphoric acid (PPA) and dibutyl phthalate (DBP) as raw materials. Infrared spectroscopy, and its microcosmic mechanism was discussed. The results show that: (1)The functional groups of matrix asphalt have different properties because of their different properties. SK90 # matrix asphalt is easier to react chemically with polyphosphoric acid than the other two kinds of matrix asphalt. (2)With the increase of PPA content, the polar sulfoxide functional group corresponding to IS = O in asphalt will produce dipole and interact and correlate with other dipoles in asphalt, thus increasing the viscosity of asphalt. (3)With the increase of PPA content, the size of SBS particles gradually unified, the grain structure gradually distributed evenly, together to form a network structure, significantly improved SBS modified asphalt high temperature storage stability.