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Prata coloidal como pigmento multifuncional inovador - Know More. Create More.


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Paint InnovationInternacionalPrata coloidal como pigmento multifuncional inovador

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Prata coloidal como pigmento multifuncional inovador

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Um novo estudo visa avaliar o efeito de duas quantidades diferentes de prata coloidal na durabilidade e na atividade biocida de uma tinta de madeira à base de água.

Uma notável atividade antibacteriana da tinta Ag-poliuretano pôde ser observada – mas nenhuma atividade fungicida, devido à baixa concentração de prata na tinta.

A influência deste pigmento multifuncional nas características estéticas dos revestimentos foi avaliada por medições colorimétricas e observações em microscopia óptica. A durabilidade das amostras foi investigada por meio de diferentes ensaios de degradação acelerada, como a exposição em câmara climática e à radiação UV-B. Observações de microscópio eletrônico de varredura, análise de espectroscopia de infravermelho e inspeções colorimétricas foram realizadas para destacar a influência residual da prata na alteração do comportamento protetor da tinta.

Excelente atividade antibacteriana

As amostras contendo prata exibiram excelente atividade antibacteriana contra Staphylococcus aureus e Escherichia coli, enquanto a prata coloidal não apresentou desempenho fungicida eficaz contra os fungos Coniophora puteana e Trametes versicolor. Por fim, este trabalho demonstra como a prata coloidal pode ser utilizada como pigmento funcional em tintas para madeira, capaz de modificar a aparência do revestimento, melhorando seu desempenho antibacteriano, sem prejudicar seu desempenho protetor.

O estudo foi publicado em Progress in Organic Coatings, Volume 175, fevereiro de 2023.

 

 

 

Fonte: european-coatings.com 08.02.2023

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