中国塑料 ›› 2024, Vol. 38 ›› Issue (9): 1-7.DOI: 10.19491/j.issn.1001-9278.2024.09.001

• 材料与性能 •    

相变微胶囊的制备、性能评价及相变沥青的性能分析

谭剑1, 王俊竹1, 李帅2(), 刘欣烨2   

  1. 1.昭通市宜昭高速公路投资开发有限公司,云南 昭通 6570001
    2.哈尔滨工业大学交通科学与工程学院,哈尔滨 150090
  • 收稿日期:2024-01-10 出版日期:2024-09-26 发布日期:2024-09-27
  • 通讯作者: 李帅(1990-),男,博士,主要从事道路新材料的开发及应用,lischd@163.com
    E-mail:lischd@163.com

Preparation and performance evaluation of phase⁃change microcapsules and performance analysis of phase change asphalt

TAN Jiao1, WANG Junzhu1, LI Shuai2(), LIU Xinye2   

  1. 1.Zhaotong Yizhao Expressway Investment and Development Co,Ltd,Zhaotong 6570001,China
    2.School of Transportation Science and Engineering,Harbin Institute of Technology,Harbin 150090,China
  • Received:2024-01-10 Online:2024-09-26 Published:2024-09-27
  • Contact: LI Shuai E-mail:lischd@163.com

摘要:

为探究微胶囊对沥青性能的影响,通过正交试验,探明合成脲醛(三聚氰胺⁃尿素⁃甲醛)树脂壳材和正十四烷芯材对相变微胶囊性能的影响,解析其最佳制备工艺;采用差示扫描量热仪(DSC)、动态剪切流变试验仪(DSR)等实验手段,研究相变微胶囊改性沥青(相变沥青)的功能性。结果表明,微胶囊最佳制备工艺为乳化剂浓度7 %,乳化转速2 000 r/min,芯材与壁材质量比1∶1,油水体积比1∶7,合成时间90 min,合成温度80 ℃,此条件下制备的微胶囊潜热为117 J/g;微胶囊壳材密封性较好,能够在沥青中稳定存在,满足沥青施工温度区间要求;相变沥青放热区间为-7.1~-17.9 ℃,吸热区间为2.3~13.5 ℃,当微胶囊掺量为7 %时,相变沥青相变焓为5.258 J/g;相变微胶囊能够有效延缓沥青硬化过程,且在常温条件下保持稳定,具有应用潜力。

关键词: 相变材料, 微胶囊, 沥青, 正十四烷

Abstract:

In this study, the impact of phase⁃change microcapsules (PCM) on asphalt performance was investigated through a series of orthogonal experiments. These experiments focus on the evaluation of the effect of the urea⁃formaldehyde (melamine⁃urea⁃formaldehyde) resin as a shell material and n⁃tetradecane as a core material on the synthetic efficiency of PCM. The optimal preparation process for PCM was analyzed. Differential scanning calorimetry and dynamic shear rheology were employed to assess the performance of the PCM⁃modified asphalt (referring to as phase change bitumen). The findings indicated that the most effective synthetic parameters were determined for PCM at an emulsifier concentration of 7 wt.%, an emulsification speed of 2 000 r/min, a mass ratio of core to wall material of 1∶1, a 1∶7 oil⁃to⁃water volume ratio, a synthetic time of 90 min, and a reaction temperature of 80 ℃. Under such conditions, PCM exhibited a latent heat of 117 J/g. Furthermore, the microcapsule shell presented excellent sealing properties, ensuring the stability of asphalt within the range required for construction temperature. The PCM⁃modified asphalt showed an exothermic interval from -7.1 to -17.9 ℃ and an endothermic interval from 2.3 to 13.5 ℃. The PCM⁃modified asphalt presented a phase⁃change enthalpy of 5.1 J/g at a microcapsule concentration of 7 wt.%. More importantly, the incorporation of PCM effectively slowed down the hardening process of the PCM⁃modified asphalt and maintained its stability at room temperature. The developed phase⁃change asphalt exhibits great potential for application.

Key words: phase change material, microcapsules, asphalt, n?tetradecane

中图分类号: