紫外光吸收剂插层蒙脱土改性沥青的流变性能

Rheological Properties of Ultraviolet Absorber Intercalated Montmorillonite Modified Asphalt

本文通过对钠基蒙脱土(Na-MMT)进行处理得到有机蒙脱土(OMMT);选用不同紫外光吸收剂(UV326、UV328、UV531和UV770),采用插层复合的方法制备得到紫外光吸收剂插层有机蒙脱土(UVA/OMMT);以UVA/OMMT为改性剂对沥青进行改性,并评价了UVA/OMMT改性沥青的动态剪切流变性能。结果表明,不同类型UVA/OMMT的加入均使沥青的复数剪切模量(G*)和车辙因子增大,而相位角(δ)减小。UVA/OMMT可显著提高沥青抵抗高温变形的能力。

The organic montmorillonite (OMMT) was prepared by intercalation of Na-montmorillonite (Na-MMT) and organic intercalator. Then the ultraviolet absorber (UVA) intercalated organic montmorillonite (UVA/OMMT) was designed with different UVAs (UV326, UV328, UV531 and UV770) and OMMT. The UVA/OMMT modified asphalt was then prepared via melt blending. The rheological properties of different UVA/OMMT modified asphalt were studied by the dynamic shear rheometer (DSR). Results show that the complex shear modulus and the rutting factor of asphalt were increased, while the phase angle was decreased with the addition of UVA/OMMT. The high temperature stability of asphalt was improved by adding different types of UVA/OMMT.