Performance of polyester/epoxy binder coating system – studies on coating resistance, adhesion and differential scanning calorimetry
Abstract
Purpose
The purpose of this paper is to study the electrochemical, mechanical and thermal characteristics of polyester – epoxy coating systems using electrochemical impedance spectroscopy (EIS), pull-off test and differential scanning calorimetry (DSC). These are very important properties to evaluate the performance of a coating system. Proper measurement and analysis techniques are needed for a proper evaluation of these properties to ensure the coating performance.
Design/methodology/approach
Different ratios of polyester and epoxy resins have been blended to formulate good anticorrosive, mechanically strong and thermally stable binder coating system. EIS, pull-off test and DSC were used to evaluate these properties.
Findings
The sample containing 90 wt.% polyester exhibited the best corrosion resistance from the beginning until the end of exposure time. The value of corrosion resistance (Rc) obtained on the 30th day of exposure was found to be 2.89 × 108 ohm cm−2. The glass transition temperature (Tg) was found to be increasing with the incorporation of epoxy to the binder system. The result from pull-off test showed the best adhesion with the sample containing 90 wt.% polyester which also has the lowest Tg promoted better adhesion properties.
Practical implications
The curing time must be reduced for practical applications.
Originality/value
Hybrid coatings systems have been formulated. This paper discusses on the highest coating resistance obtained polymer-substrate mechanical properties and thermal characteristic of the polyester/epoxy binder resin using DSC.
Keywords
Acknowledgements
The authors would like to thank the University of Malaya for providing research grants to support the project. The research work has been highly supported by UMRG Programme RP025C-14AFR and RG277/14AFR grants. The authors also thank the Centre of Ionics University of Malaya (CIUM) for providing them with the equipment and instruments that helped them to carry on this research.
Citation
Ismail, L., Ramesh, K., Mat Nor, N.A., Jamari, S.K.M., Vengadaesvaran, B. and Arof, A.K. (2016), "Performance of polyester/epoxy binder coating system – studies on coating resistance, adhesion and differential scanning calorimetry", Pigment & Resin Technology, Vol. 45 No. 3, pp. 158-163. https://doi.org/10.1108/PRT-02-2014-0015
Publisher
:Emerald Group Publishing Limited
Copyright © 2016, Emerald Group Publishing Limited