Physical properties of a soy-based polyol as polyurethane coatings

This research focused on synthesis of epoxidized soybean oil in order to produce soy-based polyol which later was used to produce soy-based polyurethane. Soy-based polyol was produced through alcoholysis process of ESBO with glycerol (1:3 and 1:5) molar ratio. Polyol A had a ratio of 1:3 while polyol B had 1:5 ratio. The polyols were investigated by IR spectra and viscosity test. The polyols then were used to produce three formulation of polyurethane samples which were 20MDI:80polyol, 30MDI:70polyol and 40MDI:60polyol. The polyol samples were investigated by IR spectra, hardness test and gel content test. From FTIR result, polyol A and polyol B showed the incorporation of hydroxyl group from glycerol at 3430.26 cm −1 and 3281cm −1. There was a formation of N-H group in PU 1 and PU 4 at 3451 cm −1 and 3448 cm −1. The viscosity of polyol A was higher compared to polyol B. PU 1, PU 2 and PU 3 which made up from polyol A had higher hardness and gel content compared to PU 4, PU 5 and PU 6 which made up from polyol B.