层状双羟基复合金属氢氧化物/废胶粉改性沥青的性能及老化机理  

Properties and Aging Mechanism of Layered Double Hydroxides/Crumb Rubber Modified Asphalt

作　　者：刘武[1] 肖新颜[1] 晏英[1] 

机构地区：[1]华南理工大学化学与化工学院,广东广州510640

出　　处：《高分子材料科学与工程》2015年第2期72-76,共5页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(U1162120)

摘　　要：以层状双羟基复合金属氢氧化物(LDHs)及废胶粉(CR)为改性剂,采用熔融共混法制备了LDHs/CR复合改性沥青。通过原子力显微镜、离析实验、旋转薄膜烘箱老化实验(RTFOT)、室内加速紫外老化试验及紫外可见分光光度计(UV-Vis)等实验方法,对复合改性沥青的性能进行了研究,并初步探讨了改性剂与沥青的相互作用机理。结果表明,LDHs的掺入使得废胶粉在沥青中分散得更均匀且胶粉颗粒的平均粒径更细小;相比于基质沥青,复合改性沥青的高低温性能得到很大的改善;随着LDHs掺量增加,LDHs/CR复合改性沥青的离析软化点差值由9.2℃减小到1.3℃,储存稳定性大幅提升;与废胶粉改性沥青相比,LDHs/CR复合改性沥青的抗老化性能(尤其是抗UV老化性能)得到明显改善。The LDHs/CR composite modified asphalt was prepared via the melt blending with layered double hydroxides(LDHs) and crumb rubber(CR) as modifying agent. The properties of the modified asphalt were characterized by atomic force microscopy(AFM),storage stability test,rotating thin film oven test(RTFOT),accelerated ultraviolet aging test and UV-Vis. The interaction mechanism between the modifiers and base asphalt was analyzed. The results indicate that the crumb rubber powder is dispersed more uniformly in asphalt,and the average particle size of CR becomes tinier due to addition of LDHs; compared with the base asphalt,the high-/low-temperature properties of compound modified asphalt are improved; with the content of LDHs increasing,softening point increment between top and bottom of the measured asphalt sample in aluminum tube decreases from 9. 2 ℃ to 1. 3 ℃,thus the storage stability of the modified asphalt is improved significantly; compared with the CR modified asphalt,the anti-aging properties of LDHs/CR compound modified asphalt are improved greatly,especially the UV aging resistance of asphalt.

关 键 词：层状双羟基复合金属氢氧化物 废胶粉 沥青 储存稳定性 紫外老化 

分 类 号：TQ316.6[化学工程—高聚物工业]