Green antifungal waterborne coating based on essential oil microcapsules

REVUELTA, M.V.; BOGDAN, S.; GÁMEZ-ESPINOSA, E.; DEYÁ, M.C.; ROMAGNOLI, R.

PROPRESS IN ORGANIC COATINGS

Elsevier

Lugar: Amsterdam; Año: 2021 vol. 151 p. 1 - 9

0300-9440

There is a great concern about the indoor microbial colonization especially in places that should have highstandards of environmental hygiene. Besides, due it shortened the useful life of the coating by discoloration anddegradation. Currently this is a problem that must be solved in an innovative and eco-friendly way. In this sense,the aim of the work was to develop a green waterborne paint formulated with microcapsules containing essentialsoil as biocide agent. This novel hygienic coating would be applied as to protect indoor surfaces fromfungi. The microcapsules were synthesized by interfacial polymerization. Melamine-formaldehyde (MF) resinwas used for the microcapsule shell wall, and Lavandin and Tea Tree essential oils (EOs) as core materials. Thesynthesized microcapsules were characterized by scanning electron microscopy, Fourier transform infraredspectroscopy and particle size analysis. Preparation of acrylic waterborne paint was performed and the microcapsulesMF-EOs were dispersed into the original paint just before application on commercial gypsum boards.The stability of the MF-EOs in the paint was successfully achieved. Two control paints were used, one containingEOs in free form and other without biocide.The effectiveness of the microcapsules into paint film against spore suspension of Aspergillus fumigatus wasevaluated by seeding the fungus on the painted surface. The fungal growth was evaluated according to ASTMD5590 standard specification. The score obtained from MF-Lavandin paint indicates just a trace growth onto thepainted surface (