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Wednesday, 15 July 2020
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Raw materials & technologies, Technologies, Powder coatings

Are DMF-based polyesters suitable for powder coatings?

Monday, 4 November 2013

Researchers from the University Eindhoven, The Netherlands, and Gdansk, Poland, evaluated linear and branched bio-based semi-aromatic (co)polyesters as resins for solvent-based and powder coatings.

DMF-based branched polyesters are suitable for solventbased and powder coating applications

Quell: Allyson Ricketts -  Fotolia.com

DMF-based branched polyesters are suitable for solventbased and powder coating applications

Quell: Allyson Ricketts -  Fotolia.com

Dimethyl-2,5-furandicarboxylate (DMF), 2,3-butanediol and various multifunctional comonomers were used to synthesize amorphous hydroxyl-end-capped (co)polyesters. The sceintists cross-linked the resins using the ɛ-caprolactam blocked trimer of isophorone diisocyanate.

Copolyesters show a good solvent resistance

Both the solventbased and powder coatings proved to be hard but brittle, which was a result of the very stiff molecular structure of the formed network. This was corroborated by the Tg values obtained for the coatings, which exceeded 100 °C for both the solventbased and powder coatings. The poly(ester urethane) coatings prepared from the branched copolyesters show a good solvent resistance. However, swelling occurred during the solvent treatment, indicating an insufficient network formation. The solvent-based and powder coatings exhibit similar mechanical and physical performance, showing that in this study there was no significant influence of the preparation method. In view of the obtained results it can be concluded that DMF-based branched polyesters are interesting candidates for solvent-based and powder coating applications.

The study is published in: Progress in Organic Coatings, Volume 77, 2013.

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