【作者】 吉永海；

【导师】 李锐； 郭淑华；

【作者基本信息】 石油化工科学研究院 ， 有机化工， 2001， 硕士

【摘要】 本文主要探讨了聚合物SBS改性沥青的相容性和稳定机理。SBS改性沥青的主要问题是SBS和沥青的相容性及贮存稳定性。由于SBS和沥青的化学结构、分子量、粘度和密度不同，在热贮存过程中SBS和沥青易发生相分离，改性沥青不能稳定贮存。本文结合SBS和沥青的结构特点，加入相容剂和稳定剂来稳定SBS在沥青中的分散。相容剂在SBS-沥青体系中能够促使SBS在沥青中溶胀更充分，分散更均匀，起增塑剂的作用。稳定剂加入SBS改性沥青中，能够引发溶胀的SBS发生交联反应，形成稳定的空间网络结构，将沥青包裹在网络中，阻止SBS和沥青分离。同时，稳定剂也能够引发SBS和沥青发生接枝反应，生成SBS-沥青接枝物，位于SBS相和沥青相界面间，降低SBS相和沥青相界面间的表面张力和体系的吉布斯自由能，起乳化剂的作用，抑制SBS和沥青相分离。在相容剂和稳定剂共同作用下，SBS被均匀、稳定地分散在沥青中，形成稳定的体系。通过调整工艺参数，可制得不同级别的SBS改性沥青，满足不同的使用要求。更多还原

【Abstract】 Study on Stabilization Mechanism and Preparation Processof SBS Copolymer Modified AsphaltABSTRACTThe compatibility and stabilization mechanism of SBS copolymer modified asphalt were discussed in this paper. Major problems of SBS copolymer modified asphalt were compatibility of SBS with asphalt and storage stability of the polymer modified asphalt (PMA). The phase separation between the SBS phase and the asphalt phase would take place and the PMA could not be stored for long periods at elevated temperatures, because the two components of PMA had different chemical structures, and very different molecular masses, viscosities and densities. In this study, the problem of storage stability of PMA was solved by adding a compatilizer and a stabilizer. The compatilizer acted as a plasticizer and could swell SBS remarkably, which made SBS dispersed more homogeneously in asphalt. The stabilizer could initiate the crosslinking reaction of the swollen SBS and formed a stable three-dimensional network, therefore, asphalt was wrapped in the network and could prevent separation from SBS. On the other hand, the stabilizer could initiate the grafting reaction between SBS and asphalt to produce the SBS-grafted-asphalt. The Gibbs free energy of the PMA system and the surface tension between the SBS phase and the asphalt phase were decreased in the condition that the SBS-grafted-asphalt acted as an effective emulsifier at the interface of SBS and asphalt. The SBS modified asphalt with good storage stability could be obtained provided that the phase separation between SBS and asphalt could be prevented in the case that the SBS was finely dispersed in asphalt and formed a stable blending system. The different grades of SBS modified asphalt could be prepared by adjusting the process parameters.更多还原