摘要
为了考察紫外老化对交联丁苯橡胶改性沥青的性能及微观结构的影响,用4,4′-二硫代二吗啉对丁苯橡胶改性沥青进行交联改性,通过对不同老化时间下交联改性沥青的物理性能试验,并结合微观结构分析及图像处理的方式,借助拟合结果综合分析了紫外老化过程中改性沥青的性能和微观结构及其面积比的变化。结果表明,在紫外老化7~21 d的过程中,老化速率较快且各项性能变化明显,老化28 d后试样的微观溶胀面积比从21.41%减少至13.11%,沥青与改性剂的稳定两相“海-岛”交联体系结构逐渐被破坏。溶胀面积比的变化趋势与针入度、软化点和旋转黏度的拟合程度较高,但与延度的变化不存在明显规律。长期紫外老化后交联改性沥青的低温性能严重下降,不适用于高紫外辐射且寒冷的地区。
In order to investigate the effect of ultraviolet aging on the properties and microstructures of crosslinked styrene-butadiene rubber (SBR) modified asphalt, 4,4′-dithiodimorpholine was used to crosslink SBR modified asphalt. The mechanical properties of crosslinked modified asphalt with different aging time were tested, and the changes of pro-perties, microstructures and area ratio of crosslinked structure during ultraviolet aging were comprehensively analyzed by means of fitting results combined with microstructural analysis and image processing. The results showed that the aging rate was faster and the properties changed obviously during ultraviolet aging for 7-21 days. After 28 days of aging, the swelling area ratio of the samples decreased from 21.41% to 13.11%. The stable two-phase "sea-island" crosslinking structure of asphalt and modifier was gradually destroyed. The trend of swelling area ratio had a high degree of fitting with penetration, softening point and rotational viscosity, but it had no obvious relationship with the change of ductility. After long-term ultraviolet aging, the low temperature performance of crosslinked modified asphalt was se-riously reduced, which was not suitable for high ultraviolet radiation and cold areas.
作者
程培峰
张展铭
李艺铭
王玉伟
CHENG Pei-feng;ZHANG Zhan-ming;LI Yi-ming;WANG Yu-wei(Civil Engineering College, Northeast Forestry University, Harbin 150040, China;Yunnan Construction Investment Holdings Group Co Ltd, Kunming 650011, China)
出处
《合成橡胶工业》
CAS
北大核心
2019年第4期312-317,共6页
China Synthetic Rubber Industry
关键词
4
4′-二硫代二吗啉
丁苯橡胶
交联体系
改性沥青
道路工程
抗紫外老化性能
溶胀面积比
定量分析
4,4′-dithiodimorpholine
styrene-butadiene rubber
crosslinking system
modified asphalt
road engineering
ultraviolet aging resistance
swelling area ratio
quantitative analysis
