Fluorinated additives for stain-resistant matt latex paints |
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Authors: | J Branquinho J A C Alves Susana Carvalho Jorge Moniz Fernanda Oliveira M H Gil |
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Affiliation: | 1. Chemical Engineering Department, University of Coimbra, Pólo II, Rua Sílvio Lima, 3030-790, Coimbra, Portugal 2. Martifer Inova??o e Gest?o, S. A., Zona Industrial, Apartado 17, 3684-001, Oliveira de Frades, Portugal 3. Resiquímica – Resinas Químicas, S. A., Estrada Nacional 249 (Km 15), 2725-397, Mem Martins, Portugal 4. CIN – Corpora??o Industrial do Norte, S. A., Estrada Nacional 13 (Km 6), Apartado 1008, 4471-909, Maia, Portugal
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Abstract: | Latex paints are often preferred over solvent-based paints due to their good gloss and color retention, ease of handling,
and lower volatile organic contents. However, matt latex paints tend to show poor stain resistance since they develop highly
porous and rough surfaces. In recent years, matt latex paints have been improved in their stain resistance with resulting
better cleanability, by adding hydrocarbon acrylic polymers and fluorine-containing compounds. In this work, we prepared fluorinated
acrylic emulsions of the copolymer of butyl acrylate (BA) and perfluorobutylethylene (PFBE), which were introduced in latex
paint compositions. The properties of the modified paints were evaluated by performing stain resistance tests with several
domestic products. It was observed that they had good stain release properties, thus conferring good properties to the final
painting system. They contain the self-cleaning behavior typical of fluorinated coatings, which have been proven by the decrease
of their surface energies. Since the cleaning procedures of a matt paint film can also impart some gloss increase, the wet
and dry burnishes were also evaluated. The results have shown improvements in stain resistance and cleanability of the modified
matt latex paints with the maintenance of their stability and the coatings gloss as required. |
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