Preparation of Polypropylene Microcapsules and Study on Self-healing Properties of Cement Mortar

DOI

10.2991/978-94-6463-728-1_31How to use a DOI?

Keywords

Concrete; Self-healing; Microcapsules; IPDI; Polypropylene

Abstract

Cement concrete has the advantages of abundant sources of raw materials, low cost, convenient molding, etc., and is extremely widely used in the field of building construction. Whereas, due to the high brittleness and low tensile strength of concrete, cracks are easy to occur during use, resulting in a great reduction in its mechanical properties and impermeability, which seriously affects the durability of concrete. In order to prolong the service life of concrete, a new self-healing microcapsule was prepared by melting, dispersion, and condensation by using polypropylene as the wall material and isophorone diisocyanate (IPDI) as the core material. The particle size distribution, mechanical properties, morphology, and structure of microcapsules were characterized by a laser particle size analyzer, a nanoindentation tester, a scanning electron microscope, and infrared spectroscopy, and the self-healing effect of cracks in cement mortar mixed with microcapsules was evaluated. The results showed that when the temperature was 155 ℃, the stirring speed was 600 rpm, and the polypropylene/IPDI mass ratio was 1:2, the prepared microcapsules were coarse spheroids with a mass leakage rate of 7.8%. The presence of an asymmetric stretching vibration peak (2270 cm⁻¹) of IPDI in the infrared spectrum of the microencapsulation demonstrates that IPDI has been successfully coated into polypropylene wallcovering. When the microcapsule content is 3.0% of the cement mass, the cement mortar crack with a width of 0.33 mm can be self-repaired.

Copyright

© 2025 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Fei Du
AU  - Hongyang Guo
AU  - Chao Mei
AU  - Jing Li
AU  - Bo Liu
AU  - Wei Du
PY  - 2025
DA  - 2025/05/19
TI  - Preparation of Polypropylene Microcapsules and Study on Self-healing Properties of Cement Mortar
BT  - Proceedings of the 3rd International Conference on Green Building, Civil Engineering and Smart City (GBCESC 2024)
PB  - Atlantis Press
SP  - 312
EP  - 322
SN  - 2352-5401
UR  - https://doi.org/10.2991/978-94-6463-728-1_31
DO  - 10.2991/978-94-6463-728-1_31
ID  - Du2025
ER  -