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Problematiche conservative dei murales contemporanei acrilico – vinilici

Autore: N. GURGONE, P. IAZURLO, U. SANTAMARIA, M. G. CASTELLANO

Anno: 2005

in: Sulle pitture murali. Riflessioni, conoscenze, interventi, Atti del XX Convegno Internazionale di Studi, Bressanone 12-15 luglio 20055

Contenuti:

The second half of the twentieth century marks a breaking point in the wide and complex scenario of the Italian mural painting with the shift from traditional technical paintings in favour of innovative procedures that better suit the new products now available in the market.

The renewed expressive demand of the artists, such as the need to quickly paint large surfaces with easy to find, low-cost products often not even peculiar to the artistic traditional environment, give births to masterpieces which have been realised with non-conventional techniques, easy to decay. The prevailing use of vinyl-acrylic paint and colours recently formulated on new supports, often made of cement, along with conditions of prolonged unfavourable climatic exposure, outline new questions for the conservation and restoring of such masterpieces.

In this paper the investigation on painted surfaces protection is analysed, taking into consideration the practical use of water-repellent products (silane) mixed with UV stabilizers. Samples of concrete were produced, on top of which polychromic coats were applied with acrylic media. Such samples have been treated with two silanic preservatives with and without the adding of UV stabilizers. After this, the samples were made artificially older by exposing them in a climatic chamber. The use of the colorimetric system CIE La*b* made it possible to verify the different behaviours of the applied protective blends and assess their effectiveness.