Anales CIDEPINT 1997-98

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https://digital.cic.gba.gob.ar/handle/11746/10181

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Examinando Anales CIDEPINT 1997-98 por Autor "Amalvy, Javier Ignacio"

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  • Artículo
    Acceso Abierto
    Formulation and testing of a water-borne primer containing chestnut tannin
    (1998) Pardini, Oscar Ricardo; Amalvy, Javier Ignacio; Romagnoli, Roberto; Vetere, Vicente
    In this work an aqueous primer containing chestnut tannin and phosphoric acid was developed and its anticorrosive properties assessed by different conventional tests. Treated Steel ponéis coated with an anticorrosive paint and a topcoat were subjected to the salí spray test, humidity chamber, mechanical tests (adhesión and flexibility) and electrochemical tests (corrosión potential, ionic resistance and polarization resistance). Electrochemical tests were done employing only ponéis primed with the primer. The binder employed in this research was prepared in the laboratory by emulsión polymerization of acrylic monomers. It was found that the tested formulation protected Steel against corrosión incorporating corrosión producís to the film as ferric tannates and avoiding oxide formation. Undercutting rusting was not significant and the scratch line stood free from oxides. The good stability of the binder in low pH media and the interaction of the binder with the substrate are decisive factors in the performance of this aqueous pretreatment system.
  • Artículo
    Acceso Abierto
    The use of potymerisable surfactants in emulsión copolymerization for coatings applications
    (1998) Amalvy, Javier Ignacio; Unzué, M. J.; Schoonbrood, H. A. S.; Asua, J. M.
    In this paper results obtained in high solids contení emulsión copolymerizations using polymerizable surfactcmts (surfmers) have been reviewed On the basis of the interpretation of the behavior of the surfmers (the conversión vs. time and their performance in stability tests and film properties), an optimal surfmer behavior has been defined, which means that all the added surfmer groups end up on the particle surface rather than being buried, which leads to inferior látex stability. One of the strategies that have been proposed to achieve this has been applied to prepare a well-defined styrene-butyl acrylate látex of which film can be easily be casi. Its properties in terms of mechanical stability, film water absorption, and film surfactant exhudation have been assessed and compared with these of a similar látex with sodiicm dodecyl sulfate. Other comonomer Systems have been studied as well with the maleic surfmer. In these Systems the surfmer behavior was less “optimum ”. For these lotices both mechanical stability and water absorption was assessed