Epoxy-based paints from glycolysis products of postconsumer PET bottles: synthesis, wet paint properties and film properties

Glycolysis of waste polyethylene terephthalate (PET) flakes obtained from grinding postconsumer bottles was carried out at 180–190°C, and molar ratios of PET/EG were taken as 1/6. Reaction product was extracted by hot water, and water soluble crystallizable fraction and water insoluble fraction were obtained. These fractions were characterized by hydroxyl value determination. Water soluble crystallizable fraction obtained from glycolysis product was used for synthesis of PET-based epoxy resin. Two epoxy-based paints were prepared using different amounts of PET-based epoxy resin. Wet paint properties, and chemical and physical film properties of paints containing waste PET were determined. Increasing the rate of PET-based epoxy resin in paint formulation did not have a negative effect on the wet paint properties and dry film properties of epoxy-based paints containing waste PET.