Enhanced properties of a bio

A new study presents a comparison of bio-based epoxide-diamine coatings prepared with acyclic and cyclic aliphatic diamines.

As replacements for bisphenol-A, new bio-based and reactive epoxy-amine coatings have been investigated in a new study. Bio-based precursor, epoxy-functionalised tung oil (ETO) was synthesised using glycidyl methacrylate (GMA) and tung oil via a Diels–Alder reaction. The new ETO-diamine-cured systems were prepared with the equivalent molar ratio at room temperature. ETO was cured with acyclic aliphatic (Jeffamine D400) and cyclic aliphatic (Epicure 3300) amines, at four temperatures ranging from 25 to 150°C. The coatings were then compared in terms of their thermal and mechanical properties.

Test results showed that the epoxide-diamine polymers demonstrated thermal stability up to 170°C. While all the cured systems exhibited good pencil hardness, cross-hatch adhesion, impact resistance, and reverse resistance properties, the epoxide-acyclic diamine system demonstrated greater pendulum hardness and notable pull-off adhesion at 150°C. The research demonstrates the potential for greener and more reactive tung oil-based epoxide coatings with enhanced properties.

The study has been published in Journal of Coatings Technology and Research, Volume 20, Issue 4, July 2023.

Event tip

Bio-based systems are also the focus of the EC Conference Bio-based and Water-based Coatings on November 14 and 15 in Berlin, Germany. At the conference, you will learn about the latest developments in bio-based and water-based coatings.