Evaluation of heat resistant properties of silicone-acrylic polyol coating by electrochemical methods

Purpose ‐ The purpose of this paper is to investigate the heat resistance properties of silicone-acrylic hybrid system on cold rolled mild steel panel. Design/methodology/approach ‐ The presence of Si-C bonds in hydroxyl functional solid phenyl-methyl silicone should be able to improve heat resistance properties of silicone-acrylic polyol coating. Different weight ratios of silicone resin and acrylic polyol resins were blended in order to obtain the composition for optimum thermal properties. Thermal stability of silicone based protective coatings has been investigated by means of potential time measurement (PTM) and electrochemical impedance spectroscopy (EIS) techniques. Findings ‐ The blending of silicone intermediate resin with acrylic polyol resins. The coating consisting of 30 per cent silicone resin and 70 per cent acrylic resin showed significant improvement of heat resistivity compared to pure acrylic polyol resins on cold roll mild steel panels. This study demonstrates an interesting correlation between PTM and EIS studies. Research limitations/implications ‐ Findings may be useful in the development of heat resistant paints. Practical implications ‐ The blending method provides a simple and practical solution to improve the heat resistance properties of acrylic polyol resins. Originality/value ‐ Durability and functionality of the coating, critically depend on the strength and adhesion properties of the materials. This may be a useful source of information for the development of organic-inorganic coatings.