Development of protective coating system using natural rubber – acrylic polyol resin for mild steel
Abstract
Purpose
The purpose of this study is to develop a protective coating system on mild steel panel incorporating epoxidized natural rubber with acrylic polyol resin.
Design/methodology/approach
In this work, a novel attempt is made to develop binder coatings using epoxidized natural rubber-based material and an organic resin (acrylic resin) for corrosion protection on metal substrate. Seven different samples of multifunctional coatings are developed by varying the compositions of epoxidized natural rubber (ENR) and acrylic resin. The properties of the developed coatings have been characterized using analytical methods such as Fourier transform infrared spectroscopy (FTIR) and electrochemical impedance spectroscopy (EIS). EIS has been carried out for 30 days to evaluate the corrosion resistance after immersing into 3.5 wt.% of sodium chloride. Cross hatch cut tester (CHT) has been used to study the adhesive properties. UV–Visible Spectroscopy (UV–Vis) was also used to assess changes in the coating-film transparency of the natural rubber-based coating systems in this study.
Findings
The developed coatings have formed uniform layer on the substrate. CHT results show excellent adhesion of the coatings. Higher concentrations of ENR have higher transparency level, which reduces when the acrylic concentration increases. FTIR analysis confirms the crosslinking that occurred between the components of the coatings. Based on the impedance data from EIS, the incorporation of natural rubber can be an additive for the corrosion protection, which has the coating resistance values well above 108Ω even after 30 days of immersion.
Practical implications
The blending method provides a simple and practical solution to improve the strength and adhesion properties of acrylic polyol resin with epoxidized natural rubber. There is still improvement needed for long-term applications.
Originality/value
The work has been conducted in our laboratory. The combination of natural rubber-based materials and organic resins is a new approach in coating research.
Keywords
Acknowledgements
The authors want to thank the Ministry of Higher Education for the Fundamental Research Grant Scheme (FRGS/1/2022/STG05/UM/02/15) awarded to Ramesh Kasi. Also authors are extremely thankful to Universiti Malaya for providing necessary laboratory facilities for this research.
Since acceptance of this article, the following author has updated their affiliation: Ramesh Kasi is at the Department of Physical Sciences, Saveetha School of Engineering, Saveetha University (SIMATS), Chennai, India.
Conflict of interest: The authors declare that there is no conflict of interests.
Citation
Kerinasamy Naidu, M.N., Wonnie Ma, I.A., Kumar, S.S.A., Balakrishnan, V., Subramaniam, R. and Kasi, R. (2023), "Development of protective coating system using natural rubber – acrylic polyol resin for mild steel", Pigment & Resin Technology, Vol. ahead-of-print No. ahead-of-print. https://doi.org/10.1108/PRT-06-2023-0055
Publisher
:Emerald Publishing Limited
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