沥青裂缝自修复微胶囊的制备与表征研究开发-化工进展.PDFVIP

化 工 进 展 ·2898 · CHEMICAL INDUSTRY AND ENGINEERING PROGRESS 2016 年第 35 卷第 9 期 研究开发 沥青裂缝自修复微胶囊的制备与表征 裴建新 （山西交通职业技术学院，山西太原 030031 ） 摘要：为了提高沥青路面自修复性能，采用原位聚合法制备包裹沥青再生剂的脲醛树脂微胶囊，利用四因素三 水平正交试验，研究了最佳芯壁比、终点pH 、温度与乳化剂浓度对包裹沥青再生剂的脲醛树脂微胶囊形貌、粒 径与包覆率的影响；对完整试样和断裂愈合后的试样分别进行延度试验，探究普通基质沥青和添加自修复微胶 囊沥青的自修复能力。极差数值分析结果表明：pH 和温度对微胶囊制备影响程度更大，制备微胶囊的最佳工艺 是甲醛与脲的摩尔比为4 ∶5 ，芯壁比为6 ∶5 ，终点pH 为4 ，反应最终温度为70℃，十二烷基苯磺酸钠的质量 分数为 0.5% ，此条件下制备的微胶囊表面形貌致密，平均粒径为21.14m ，包覆率达到85%。在愈合试验中， 微胶囊最优质量掺量为0.3% ，此时愈合率为38.67%。 关键词：道路材料；自愈合；微胶囊；沥青再生剂；包覆率；延度试验 中图分类号：U 414 文献标志码：A 文章编号：1000 –6613 （2016 ）09 –2898 –07 DOI ：10.16085/j.issn.1000-6613.2016.09.35 Preparation and properties of self-healing microcapsule for asphalt crack PEI Jianxin （Shanxi Traffic Vocational and Technical College，Taiyuan 030031，Shanxi，China ） Abstract ：The urea-formaldehyde resin microcapsules wrapped with asphalt regenerant for asphalt self-healing were produced by in-situ polymerization ，and the core to wall mass ratio ，final pH ， temperature ，and the concentration of the emulsifier were determined as four key factors. Orthogonal experiments of the four factors and three levels were then conducted. Analysis result showed that pH and temperature had greater influence on microcapsule preparation than the other two. The optimum conditions for preparing the microcapsules were determined as formaldehyde to urea molar ratio of 4 ∶ 5，core to wall mass ratio of 6 ∶5，final pH of 4 ，temperature of 70 ℃ and the mass percentage of dodecyl benzene sulfonic acid sodium （SDBS）of 0.5%，under which the obtained microcapsules had dense surface with an average particle siz