Development of protective coating system using natural rubber - acrylic polyol resin for mild steel

PurposeThe 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/approachIn 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.FindingsThe 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 108 omega even after 30 days of immersion.Practical implicationsThe 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/valueThe work has been conducted in our laboratory. The combination of natural rubber-based materials and organic resins is a new approach in coating research.

Automated summary

This study aims to develop a protective coating system using epoxidized natural rubber and acrylic polyol resin for corrosion protection on mild steel panel. Seven different samples of multifunctional coatings were developed by varying the compositions of epoxidized natural rubber and acrylic resin. The results show that the developed coatings have good adhesion and form a uniform layer on the substrate. The incorporation of natural rubber improves the corrosion resistance of the coatings, with resistance values above 108 omega even after 30 days of immersion.