Comparison of Physical and Chemical Properties, and Applicability of Polyurethane Industrial Coating Systems Synthesized from Multiple Cooked Coconut Oil vs. Fresh Coconut Oil

There is a potential health risk to continuous use or disposal into the animal feed of several times cooked plant oils. Therefore, the experiment turned them into a useful eco-friendly substitute in the paint industry to replace the main crude oil born polyol in the polyurethane (PU) coating system to keep the lowest contribution in global warming. Two coconut oil-derived bio-based polyols (BBP) were synthesized using fresh coconut oil and waste coconut oils. The acid value, viscosity, reaction water release, oil length, FTIR spectrum, and Lovibond colorimetric index were assessed during the synthesis. Three series of white-pigmented polyurethane paint coatings were prepared using fresh bio-based polyol (FBBP) by fresh coconut oil, waste bio-based polyol (WBBP) by waste coconut oil, and commercially available polyol (CAP). Physical and chemical properties such as fineness of grinding, viscosity, film hardness, flexibility, impact resistance, density, gloss, touch drying time, hard drying time, adhesion, dry film thickness, water resistance, solid content, and colour deviation were tested among them. According to the results, it was proven that both PU series of BBP equally performed in many physical However, PU with WBBPs was better in drying time and PU with FBBPs were better in viscosity and colour deviation. When both series compared PU with CAP, it was proven that all three series were equally performed in film hardness, adhesion, water resistance, flexibility, and impact resistance. But both PU series of BBP were better in drying time and PU series with CAP was better in density, gloss, dry film thickness, and solid content