Effects of free and microencapsulated biocides on characteristics of wood coatings and their mold growth resistance

Miri Tari, Seyed Mahmoud; Tarmian, Asghar; Azadfallah, Mohammad; Ali, Abdolkhani; Efhamisisi, Davood

doi:10.22092/ijwpr.2019.123839.1499

Document Type : Research Paper

Authors

¹ Ph.D, Preservation and Modification of Wood, Department of Wood and Paper Sciences and Technology, Faculty of Natural Resources, University of Tehran, Karaj,Iran

² Associate Professor, Department of Wood and Paper Science and Technology, Faculty of Natural Resources, University of Tehran, Karaj,Iran

³ wood and paper science and technology department, of natural Resources faculty, university of Tehran. IRAN

⁴ Assistant Professor, Department of wood and paper science and technology, Faculty of Natural resources, University of Tehran.

https://doi.org/10.22092/ijwpr.2019.123839.1499

Abstract

DOR:98.1000/1735-0913.1398.34.45.66.1.1575.1575
Mold growth resistance of Polyurethane and Diotrol coatings containing natural (Thyme essential oil) and synthetic (IPBC) fungicides in both free and microencapsulated forms was studied. Polymethyl methacrylate (PMMA) microcapsules were prepared using solvent evaporation method by means of oil emulsion formation in water. Mold growth resistance against Aspergillus niger was determined by Filter Paper Disc method before and after aging process according to ASTM D 5590 Standard. Adhesion strength and surface roughness of coated samples were also measured. Results revealed that biocide-free coatings cannot provide adequate protection against mold growth, and addition of biocides, especially IPBC, significantly improved the mold growth resistance. Even after the aging process, microencapsulated biocides were able to provide better protection against mold growth due to controlled-release mechanism and shielding-effect of polymeric shell. Although the surface roughness of polyurethane coating was increased by using of biocides in both forms, especially microencapsulated ones, its adhesion strength reduced.

Keywords

Main Subjects

Biology and Wood Protection

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Iranian Journal of Wood and Paper Science Research

Effects of free and microencapsulated biocides on characteristics of wood coatings and their mold growth resistance

References

References

-Cheng, E and Sun, X. 2006. Effects of wood-surface roughness, adhesive viscosity and processing pressure on adhesion strength of protein adhesive. Journal of Adhesion Science and Technology, 20(9):997-1017.

Volume 34, Issue 1 - Serial Number 66
April 2019
Pages 39-49

Effects of free and microencapsulated biocides on characteristics of wood coatings and their mold growth resistance

References

References

-Cheng, E and Sun, X. 2006. Effects of wood-surface roughness, adhesive viscosity and processing pressure on adhesion strength of protein adhesive. Journal of Adhesion Science and Technology, 20(9):997-1017.

Volume 34, Issue 1 - Serial Number 66April 2019Pages 39-49

Volume 34, Issue 1 - Serial Number 66
April 2019
Pages 39-49