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Researchers Study Self-Healing Epoxy Coating

Monday, July 9, 2018

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A team of researchers based out of Isfahan University of Technology recently investigated the self-healing performance of an epoxy that contains microencapsulated alkyd resin, which is based on coconut oil, and found that a certain concentration could help with coating healing.

Epoxy Coating

The microcapsules (MCs) that contained alkyd resin based on coconut oil were set at different concentrations: 5, 10 and 15 percent. These were then incorporated into an epoxy coating and applied to a steel substrate. The mixture was evaluated based on an assessment of surface roughness, gloss, adhesion strength and bending elongation. These were then compared with the properties of the control coating.

© iStock.com / fcafotodigital

A team of researchers based out of Isfahan University of Technology recently investigated the self-healing performance of an epoxy that contains microencapsulated alkyd resin, which is based on coconut oil, and found that a certain concentration could help with coating healing.

Additionally, the healing performance of the epoxy coating and its ability to protect the substrate against corrosion, with and without the MC additive, was also investigated in a NaCl solution, using potentiodynamic polarization tests and Electrochemical Impedance Spectroscopy.

Results revealed that increasing the concentration of MCs in the epoxy caused a decrease in gloss and adhesion strength, as well as reducing bending elongation. A balance struck between potentiodynamic polarization and EIS results showed that at the 10 percent MC concentration mark, the healing agent was enough to satisfactorily heal the cracks.

   

Tagged categories: Coatings Technology; Epoxy; Renewable raw materials; Research and development

Comment from Tom Schwerdt, (7/9/2018, 8:40 AM)

Age the coating film for a few years and your encapsulated alkyd is likely to have solidified, preventing any crack filling. Since you already sacrificed elongation and adhesion for a crack sealer that will no longer function - you may well end up with a poorer film.


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