Preparation and curing behaviour of microencapsulated curing agents for cold-mixed epoxy asphalt.

IF 3 4区医学 Q2 CHEMISTRY, APPLIED Journal of microencapsulation Pub Date : 2023-09-01 DOI:10.1080/02652048.2023.2215316

Qiaoliang Xiong, Juntao Du, Minxin Zhang, Huina Jia, Tianjin Li, Yi Nie

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Abstract

This study aimed to improve control over the curing behaviour of cold-mixed epoxy asphalt by using a microencapsulated curing agent (2-PZ@PC). Prepared through solvent evaporation, the 2-PZ@PC microcapsules had 2-phenylimidazole as the core material and polycarbonate as the shell material. The research examined the impact of core-shell mass ratio on microcapsule morphology and composition. Various equations, including the kinetics equation, Kissinger equation, Flynn-Wall-Ozawa, and Crane equations, were employed to assess the sustained release effect of 2-PZ@PC microcapsules on epoxy resin curing behaviour. Fluorescence microscopy and viscosity experiments were used to observe the release state of microcapsules and confirm the retardation phenomenon during construction. Optimal 2-PZ@PC microcapsules displayed a smooth spherical morphology and a maximum encapsulation rate of 32 wt% at a 1:1 core-shell ratio. The microencapsulated curing agent effectively regulated cold-mixed epoxy asphalt's curing behaviour, enhancing retention time control and application reliability.

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冷拌环氧沥青微囊化固化剂的制备及其固化性能。

本研究旨在通过使用微囊化固化剂(2-PZ@PC)来改善对冷混合环氧沥青固化行为的控制。以2-苯基咪唑为核心材料，聚碳酸酯为外壳材料，通过溶剂蒸发法制备2-PZ@PC微胶囊。研究了核壳质量比对微胶囊形态和组成的影响。采用动力学方程、Kissinger方程、Flynn-Wall-Ozawa方程和Crane方程，对2-PZ@PC微胶囊对环氧树脂固化行为的缓释效果进行了评价。采用荧光显微镜和粘度实验观察微胶囊的释放状态，确认微胶囊在构建过程中存在阻滞现象。最佳2-PZ@PC微胶囊在核壳比为1:1的条件下，具有光滑的球形形态，最大包封率为32 wt%。微囊化固化剂能有效调节冷拌环氧沥青的养护性能，提高养护时间控制和使用可靠性。

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来源期刊

Journal of microencapsulation 工程技术-工程：化工

CiteScore

6.30

自引率

2.60%

发文量

审稿时长

3 months

期刊介绍： The Journal of Microencapsulation is a well-established, peer-reviewed journal dedicated to the publication of original research findings related to the preparation, properties and uses of individually encapsulated novel small particles, as well as significant improvements to tried-and-tested techniques relevant to micro and nano particles and their use in a wide variety of industrial, engineering, pharmaceutical, biotechnology and research applications. Its scope extends beyond conventional microcapsules to all other small particulate systems such as self assembling structures that involve preparative manipulation. The journal covers: Chemistry of encapsulation materials Physics of release through the capsule wall and/or desorption from carrier Techniques of preparation, content and storage Many uses to which microcapsules are put.