有机蒙脱土/环氧树脂复合改性沥青的性能

Properties of Organic Montmorillonite/Epoxy Resin Composite Modified Asphalt

以有机蒙脱土(OMMT)和环氧树脂为改性剂,采用反应性熔融共混法制备了OMMT/环氧树脂复合改性沥青。通过X射线衍射和荧光显微镜对复合改性沥青的微观结构进行了表征,对其物理力学性能、相容性和热贮存稳定性进行了考察。结果表明,当OMMT掺加量为1%~2%时,OMMT以剥离结构存在于复合改性沥青中,体系中环氧树脂分布更加均匀;复合改性沥青中OMMT掺量为1%时,拉伸强度与环氧树脂改性沥青相比提高了25%;随着OMMT掺量的增加,复合改性沥青软化点逐渐升高,25℃针入度缓慢减小,针入度指数(PI)先增大后减小。

The composite modified asphalt was prepared via reactive melt blending process using organic montmorillonite( OMMT) and epoxy resin as modifying agent. The microstructure and morphology of OMMT/epoxy resin composite modified asphalt were characterized by X-ray diffraction( XRD) and fluorescent microscope( FM),respectively.The physical-mechanical property,compatibility and thermal storage stability of the composite modified asphalt were investigated. The results indicate that the OMMT is dispersed in the composite modified asphalt with an exfoliated structure when the content of OMMT is between 1% and 2%,and the epoxy resin is distributed more uniformly in the composite modified asphalt. The tensile strength of composite modified asphalt increases by 25% compared with epoxy resin modified asphalt when the addition of OMMT is 1%. Further,the softening point of OMMT/epoxy resin composite modified asphalt increases,the penetration of 25 ℃ decreases slightly,and the penetration index( PI) rises first and then declines with increasing OMMT content.