Studies on polymeric conservation treatments of ceramic tiles with Paraloid B-72 and two alkoxysilanes

Authors

  • Célia Constâncio,

    1. Departamento de Química e Bioquímica and Centro de Química e Bioquímica, Faculdade de Ciências da Universidade de Lisboa, Campo Grande Ed. C8, 1749-016, Lisboa, Portugal
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  • Liliana Franco,

    1. Departamento de Química e Bioquímica and Centro de Química e Bioquímica, Faculdade de Ciências da Universidade de Lisboa, Campo Grande Ed. C8, 1749-016, Lisboa, Portugal
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  • Ariana Russo,

    1. Departamento de Química e Bioquímica and Centro de Química e Bioquímica, Faculdade de Ciências da Universidade de Lisboa, Campo Grande Ed. C8, 1749-016, Lisboa, Portugal
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  • Carlos Anjinho,

    1. Instituto de Ciência de Materiais e Superfícies and Departamento de Engenharia de Materiais, Instituto Superior Técnico, UTL, Av. Rovisco Pais, 1049-001, Lisboa, Portugal
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  • João Pires,

    1. Departamento de Química e Bioquímica and Centro de Química e Bioquímica, Faculdade de Ciências da Universidade de Lisboa, Campo Grande Ed. C8, 1749-016, Lisboa, Portugal
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  • M. Fátima Vaz,

    1. Instituto de Ciência de Materiais e Superfícies and Departamento de Engenharia de Materiais, Instituto Superior Técnico, UTL, Av. Rovisco Pais, 1049-001, Lisboa, Portugal
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  • Ana P. Carvalho

    Corresponding author
    1. Departamento de Química e Bioquímica and Centro de Química e Bioquímica, Faculdade de Ciências da Universidade de Lisboa, Campo Grande Ed. C8, 1749-016, Lisboa, Portugal
    • Departamento de Química e Bioquímica and Centro de Química e Bioquímica, Faculdade de Ciências da Universidade de Lisboa, Campo Grande Ed. C8, 1749-016, Lisboa, Portugal
    Search for more papers by this author

Abstract

The aim of this study was to evaluate the effect of different polymeric protections applied on ceramic tiles on their mechanical and water absorption properties. Three conservation products were used: the acrylic polymer Paraloid B-72 and two alkoxysilane-based formulations (tetraethoxysilane (TEOS) and IN2210, a polidimetilsiloxane-based formulation). The coatings were applied onto handmade tiles manufactured according to a 18th century procedure. Different application procedures (immersion, brushing, and spraying) were tested. The protection effectiveness was assessed through capillary water absorption and four point bending tests. The mineralogical characterization of tiles was undertaken by XRD. The best protective properties of the tiles were achieved by immersion treatments with Paraloid B-72 based on the protocols followed by the museums restoration departments. Nevertheless, the results of the present work show that the second immersion in Paraloid B-72 solution, commonly made, can be eliminated, as it does not provide any significant increase in the hydrophobic or mechanical properties of the tiles. As a result, there are obvious economical benefits, as the coating process became less time-consuming and more environmental friendly, as the amount of organic compounds is reduced. On the other hand, the use of small volumes of Paraloid B-72 solution applied by brush, or IN2210 sprayed can provide good results, if the only purpose of the treatment is the increase of the hydrophobic properties. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010

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