Protección antiincrustante de estructuras sumergidas mediante recubrimientos formulados con 7-hidroxi-4-metilcumarina

AUTOR(ES)
FONTE

Matéria (Rio J.)

DATA DE PUBLICAÇÃO

19/07/2018

RESUMO

ABSTRACT Biofouling settlement on submerged structures such as ships, buoys, farms, off-shore platforms and meteorological stations induces economic losses as a consequence of material deterioration and withdraw from service. Environmental regulations focus on the use of environmental friendly products to replace metallic biocides included in antifouling paints which are highly pollutant. A growing interest for searching and identifying efficient and benign antifoulants has being carried out. For this reason, the compound 7-hydroxy-4-methylcoumarin was synthesized following Green Chemistry procedures and then, characterized by current organic analysis. In the laboratory, antifouling activity of this coumarin was estimated by settlement test, i.e., batches of mussels (Mytilus edulis platensis) were exposed to different concentrations of the compound. Results indicated that coumarin was effective on both, settlement inhibition and byssal thread. Also, recovery tests were carried out; for this test, organisms were placed in clean seawater after coumarin exposure. It was demonstrated that coumarin effect was temporary because they could rapidly recover their vital parameters. Then, a soluble matrix antifouling paint containing this compound was formulated. Paints were applied on panels and exposed in Mar del Plata harbour for 45 and 90 days. Painted panels with this formulation showed a marked antifouling activity on conspicuous species of the community. Results indicated that sustainable chemistry-synthetized 7-hydroxy-4-methylcoumarin is a promising compound to be employed in antifouling paints due to its efficiency and low toxicity.

Documentos Relacionados