Novel nanocomposite UV - cured coatings, based on photopolymerizable siloxane-modified acrylic formulations with the addition of organo-modified Boehmite (OMB), are proposed as potential protective coatings for porous stones and wood elements. The OMB nanofiller has been dispersed into an optimized acrylic-based formulation in the presence of a proper photoinitiator for UV-curing. This represents the first example of the use of Boehmite-based UV-cured nanocomposite in the field of Cultural Heritage. The advantages offered by UV-cured coatings with respect to traditional heat-cured ones mainly reside in the attainment of superior performance achievable in less time. The use of a nanocomposite protective coating will guarantee better surface properties and durability characteristics. In this chapter, the characterization of the innovative liquid photopolymerizable siloxane-modified acrylic formulations, both in presence or absence of OMB nanoparticles, is presented in order to assess the suitability of the proposed products for the specific applications. A wide experimental characterization of the solid coatings, applied on different substrate and photo-cured by using a medium pressure Hg UV lamp, is illustrated, in order to assess the attainment of the expected superior properties in terms of transparency, hydrophobicity, surface resistance, glass transition temperature, among the most important. An accelerated weathering procedure is proposed as a means to evaluate the weathering resistance of the coatings.
UV cured methacrylic-siloxane based nanocomposites as potential coating for Cultural Heritage protection
ESPOSITO CORCIONE, Carola;FRIGIONE, Mariaenrica
2013-01-01
Abstract
Novel nanocomposite UV - cured coatings, based on photopolymerizable siloxane-modified acrylic formulations with the addition of organo-modified Boehmite (OMB), are proposed as potential protective coatings for porous stones and wood elements. The OMB nanofiller has been dispersed into an optimized acrylic-based formulation in the presence of a proper photoinitiator for UV-curing. This represents the first example of the use of Boehmite-based UV-cured nanocomposite in the field of Cultural Heritage. The advantages offered by UV-cured coatings with respect to traditional heat-cured ones mainly reside in the attainment of superior performance achievable in less time. The use of a nanocomposite protective coating will guarantee better surface properties and durability characteristics. In this chapter, the characterization of the innovative liquid photopolymerizable siloxane-modified acrylic formulations, both in presence or absence of OMB nanoparticles, is presented in order to assess the suitability of the proposed products for the specific applications. A wide experimental characterization of the solid coatings, applied on different substrate and photo-cured by using a medium pressure Hg UV lamp, is illustrated, in order to assess the attainment of the expected superior properties in terms of transparency, hydrophobicity, surface resistance, glass transition temperature, among the most important. An accelerated weathering procedure is proposed as a means to evaluate the weathering resistance of the coatings.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
