Alkyd resins based on PET waste for coating applications

Medium oil alkyd resins based on glycolysed PET waste and different generations of aliphatic hyperbranched polyesters with linseed and sunflower oil fatty acids, which are of interest to the coatings industry, were investigated.

Egypt researchers synthesised alkyd resins based on glycolysed PET waste and hyperbranched polyesters with different vegetable oil fatty acids. Source: Ariane Sept/ -

Different resin compositions were synthesised and characterised by IR and 1H NMR spectroscopy. The effect of oil fatty acid type, glycolysed products, functionality of the polyols on thermal and film performance properties was studied.

Better gloss with increasing degree of branching

The onset of decomposition of all samples displayed at values above 200 °C which render them suitable for the processing requirements of most conventional coating applications. All films had good adhesion, bending, impact and ductility. The gloss and hardness increased with increasing the degree of branching and consequently, the molecular weight in the resin backbone. The presence of G3 as polyol enhanced the thermal stability and film properties of coatings.

The study is published in: Progress in Organic Coatings, Volume 102, Part B, January 2017, Pages 217–224

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