耐紫外线老化改性沥青材料的制备与性能研究

制备了环氧树脂改性沥青和掺杂纳米SiO₂的环氧树脂改性沥青,研究了基体沥青、环氧树脂改性沥青、掺杂纳米SiO₂的环氧树脂改性沥青的耐紫外线老化性能。采用物化指标测试、FT-IR和SEM等方法,研究了添加1%,2%和5%(质量分数)纳米SiO₂对环氧树脂改性沥青耐紫外线老化性能的影响。结果表明,加入纳米SiO₂后,改性沥青的软化点和粘度增加;基体沥青、PA-5%EP、PA-EP-1%SiO₂、PA-EP-3%SiO₂和PA-EP-5%SiO₂的FT-IR光谱几乎在所有峰的位置都是相同的,改性沥青与基体沥青相比,结构没有明显变化;当加入纳米SiO₂含量为5%(质量分数)时,改性沥青的粘附力显著提高,此时,纳米SiO₂颗粒较为均匀地分散到基体沥青的宏观分子网络中,形成了稳定的结构;纳米SiO₂的加入能很好地改善沥青的耐紫外线老化效果,PA-EP-5%SiO₂样品的耐紫外线老化性能最优。

Preparation and properties of UV aging resistant modified asphalt

Epoxy resin modified asphalt and epoxy resin modified asphalt doped with nano-SiO₂ are prepared.The properties of UV aging resistant of matrix asphalt,epoxy resin modified asphalt and epoxy resin modified asphalt doped with nano-SiO₂ are studied.The effects of 1 wt%,2 wt%and 5 wt%nano-SiO₂ on UV aging resistant of epoxy resin modified asphalt are studied by means of physicochemical index test,FT-IR and SEM.The results show that the softening point and viscosity of modified asphalt increase with the addition of nano-SiO₂.The FT-IR spectra of matrix asphalt,PA-5%EP,PA-EP-1%SiO₂,PA-EP-3%SiO₂ and PA-EP-5%SiO₂ are almost the same in all peaks compared with matrix asphalt.The structure of modified asphalt has no obvious change.When the content of nano-SiO₂ is 5 wt%,the adhesion of modified asphalt is significantly improved.At this time,nano-SiO₂ particles are more evenly dispersed in the macro molecular network of the matrix asphalt,forming a stable structure.The addition of nano-SiO₂ could improve the UV aging resistant of asphalt,and PA-EP-5%SiO₂ has the best UV aging resistant.