Evaluation of Silicone and Epoxy Coatings for Wood Protection Against Bacterial Growth and Outdoor Weathering

Document Type : Original Article

Authors

College of Agriculture & Natural Resources, University of Tehran, P.O. Box: 31587-77871, Tehran, Iran

10.30509/jcst.2024.167309.1226

Abstract

In this research, the performance of silicone (Polydimethylsiloxane, PDMS) and epoxy coatings for improving microbial resistance against Gram-negative (Escherichia coli) and Gram-positive (Staphylococcus aureus) bacteria and resistance to outdoor weathering of birch wood (Betula pendula) was investigated. PDMS and epoxy coating with a concentration of 15 % were prepared in hexane and acetone solvents, respectively, and applied on wood using the immersion/ultrasound method. Accelerated outdoor weathering was done with a Gardner aging wheel for 330 hours, and then the changes in color (∆E), roughness, wettability, and 24h-water absorption of samples were measured. While PDMS showed more coating film thickness, epoxy one showed more polymeric coating uptake. Both coatings showed good anti-bacterial properties with an efficiency of over 60 %. However, compared to epoxy, PDMS coating provided low water absorption, higher hydrophobicity, and less roughness changes through accelerated weathering. Overall, coating with PDMS and epoxy treatment reduced the color changes of wood during weathering by 77 % and 42 %, respectively.

Keywords

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References

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