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Polydopamine/palygorskite hybrid-reinforced epoxy coatings adhered to a concrete surface

Dewen Sun (Department of Research and Development, State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Research Institute of Building Science, Nanjing, China and Jiansu Sobute New Materials Co., Ltd, Nanjing, China)
Pingping Hou (Department of Research and Development, State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Research Institute of Building Science, Nanjing, China and Jiansu Sobute New Materials Co., Ltd, Nanjing, China)
Bo Li (Department of Research and Development, Jiangsu Sobute New Materials Co., Ltd, Nanjing, China)
Hao Yin (Department of R&D, State Key Laboratory of High Performance Civil Engineering Materials, Nanjing, China and Department of Research and Development, Jiansu Sobute New Materials Co., Ltd, Nanjing, China)
Qianping Ran (Department of Research and Development, State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Research Institute of Building Science, Nanjing, China)

Pigment & Resin Technology

ISSN: 0369-9420

Article publication date: 18 December 2020

Issue publication date: 15 November 2021

169

Abstract

Purpose

The purpose of this study is to prepare a polydopamine (PDA)–palygorskite (Pal) hybrid-reinforced epoxy coating with high adhesion strength on wet concrete surface.

Design/methodology/approach

One synthetic step was adopted to prepare novel PDA–Pal hybrid epoxy coating. The process and product were analyzed and confirmed by FIRT, thermogravimetric analysis and scanning electron microscopy. The mass fraction of PDA–Pal hybrid affecting the adhesion strength of epoxy coating was analyzed and confirmed by pull-off test.

Findings

PDA–Pal hybrid mass fractions of 0, 1, 3 and 5 were added to the coatings. For a 5 Wt.% PDA–Pal hybrid content, the adhesive strengths on the saturated or underwater concrete surfaces increased to 4.0 and 2.5 MPa, respectively. In addition, the tensile mechanical property of the epoxy coating improved significantly after PDA–Pal addition.

Practical implications

This new epoxy coating hybrid by PDA–Pal could be applied as a concrete protective layer near water or in wet or damp environments.

Originality/value

Introduction of PDA–Pal hybrid to prepare epoxy coating with high adhesion strength on wet concrete surface has not been systematically studied previously.

Keywords

Acknowledgements

This work was supported financially by The National Basic Research Program of China (973 Program) (No. 2017YFB0309904), The Natural Science Foundation of Jiangsu Province (BK20170114) and the National Natural Science Foundation of China-Joint Fund of Shandong Province (U170620242). We thank International Science Editing (www.internationalscienceediting.com) for editing this manuscript.

Citation

Sun, D., Hou, P., Li, B., Yin, H. and Ran, Q. (2021), "Polydopamine/palygorskite hybrid-reinforced epoxy coatings adhered to a concrete surface", Pigment & Resin Technology, Vol. 50 No. 6, pp. 496-501. https://doi.org/10.1108/PRT-08-2020-0090

Publisher

:

Emerald Publishing Limited

Copyright © 2020, Emerald Publishing Limited

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