紫外吸收剂插层蒙脱土对沥青老化性能的影响  

Effect of Ultraviolet Absorber Intercalated Montmorillonite on Aging Properties of Asphalt

作　　者：冯振刚[1] 张沛 孙思敖 栗培龙[1] 李新军[1] FENG Zhengang;ZHANG Pei;SUN Siao;LI Peilong;LI Xinjun(School of Highway,Chang'an University,Xi'an 710064,China)

机构地区：[1]长安大学公路学院,陕西西安710064

出　　处：《建筑材料学报》2021年第2期362-369,共8页Journal of Building Materials

基　　金：国家自然科学基金资助项目(51508032);吉林省交通运输科技项目(2018-1-7);山西省公路局科技项目(2019-1-2);中央高校基本科研业务费资助项目(300102219216)。

摘　　要：采用有机插层剂对钠基蒙脱土进行有机化处理,得到有机蒙脱土(OMMT),分别将其与不同类型的紫外吸收剂(UVA)进行复合插层,制备得到UVA插层OMMT,并通过X射线衍射试验对UVA插层OMMT的结构进行了表征;同时通过熔融共混法,制备了UVA插层OMMT改性沥青,并采用常规性能试验、薄膜烘箱老化试验和紫外光(UV)老化试验,研究了UVA插层OMMT改性沥青的物理性能、耐热氧老化性能和耐UV老化性能,评价了不同类型UVA插层OMMT对沥青耐老化性能的影响.结果表明:不同类型UVA插层OMMT对沥青的耐热氧老化性能和耐UV老化性能均具有改善作用,其中UV328插层OMMT改性沥青和UV326插层OMMT改性沥青的耐老化性能较优,原因一是OMMT的片层结构阻止了热和氧向沥青内部扩散,原因二是UV328插层OMMT和UV326插层OMMT具有较大的插层率,从而增强了UVA插层OMMT对紫外光屏蔽与吸收的协同作用.The organic montmorillonite(OMMT)was obtained via intercalation of Na-montmorillonite by organic intercalator.Then the ultraviolet absorber(UVA)intercalated OMMT was prepared with different types of UVA and OMMT.The structure of UVA intercalated OMMT was characterized by X-ray diffraction(XRD)test.The UVA intercalated OMMT modified asphalt was prepared via melt blending.The physical properties,thermo-oxidative aging resistance and ultraviolet(UV)aging resistance of the UVA intercalated OMMT modified asphalt were investigated by conventional physical properties test,thin film oven test(TFOT)and UV aging test,respectively.Based on these,the effect of different types of UVA intercalated OMMT on aging resistance of asphalt was evaluated.The results show that both the thermo-oxidative and UV aging resistance of asphalt can be improved by the UVA intercalated OMMT,among which the UV328 intercalated OMMT modified asphalt and UV326 intercalated OMMT modified asphalt show better aging resistance.The reason is that the layered structure of OMMT prevents heat and oxygen from diffusing into the asphalt.On the other hand,the intercalation rate of UV328 intercalated OMMT and UV326 intercalated OMMT is larger,which enhances the synergistic effect on shielding and absorbing UV light of the UVA intercalated OMMT.

关 键 词：沥青 紫外吸收剂 蒙脱土 热氧老化 紫外光老化 

分 类 号：U414[交通运输工程—道路与铁道工程]