The Cultural Heritage deterioration is a spontaneous decay process due to water percola- tion and air pollutant deposition. In this context, novel acrylic (Twinswet, TW) and siloxane-based (Alpha® SI30) resins were exploited starting from commercial products and then modified by adding either a commercial polysiloxane-based additive (TegoPhobe 1500 N) or a precursor of SiO2 nano- particles (Tetraethyl ortosilicate, TEOS) to improve the Vicenza stone surface hydrophobicity. Prop- erties of the coated materials were studied using different techniques such as water contact angle (WCA), capillary absorption, colorimetric and water vapor permeability measurements. Acceler- ated UV aging and eight-month outdoor exposure tests (at Milan University campus) were also performed to determine the coatings durability. Notably, the addition of both additives slightly en- hanced the surface hydrophobicity resulting in WCAs of about 140°, and decreased the water ab- sorption especially for Alpha-based resins. Conversely, a reduction of water vapor permeability was observed, even if within the threshold value of 50%. Concerning the color variation, Alpha® SI30 preserved the stone external aspect; instead, TW smoothly modified the surface color. All of the studied coatings were stable to both UV aging and outdoor exposure. Hence, the present modified commercial coatings revealed to be very promising for the protection of historical monuments.

Enhanced Historical Limestone Protection by New Organic/Inorganic Additive-Modified Resins / E. Pargoletti, V. Comite, P. Fermo, V. Sabatini, G. Cappelletti. - In: COATINGS. - ISSN 2079-6412. - 11:1(2021), pp. 73.1-73.12. [10.3390/coatings11010073]

Enhanced Historical Limestone Protection by New Organic/Inorganic Additive-Modified Resins

E. Pargoletti
Primo
;
V. Comite
Secondo
;
P. Fermo;V. Sabatini;G. Cappelletti
Ultimo
2021

Abstract

The Cultural Heritage deterioration is a spontaneous decay process due to water percola- tion and air pollutant deposition. In this context, novel acrylic (Twinswet, TW) and siloxane-based (Alpha® SI30) resins were exploited starting from commercial products and then modified by adding either a commercial polysiloxane-based additive (TegoPhobe 1500 N) or a precursor of SiO2 nano- particles (Tetraethyl ortosilicate, TEOS) to improve the Vicenza stone surface hydrophobicity. Prop- erties of the coated materials were studied using different techniques such as water contact angle (WCA), capillary absorption, colorimetric and water vapor permeability measurements. Acceler- ated UV aging and eight-month outdoor exposure tests (at Milan University campus) were also performed to determine the coatings durability. Notably, the addition of both additives slightly en- hanced the surface hydrophobicity resulting in WCAs of about 140°, and decreased the water ab- sorption especially for Alpha-based resins. Conversely, a reduction of water vapor permeability was observed, even if within the threshold value of 50%. Concerning the color variation, Alpha® SI30 preserved the stone external aspect; instead, TW smoothly modified the surface color. All of the studied coatings were stable to both UV aging and outdoor exposure. Hence, the present modified commercial coatings revealed to be very promising for the protection of historical monuments.
protective coatings; acrylic resins; siloxane resins; hydrophobicity; aging tests; outdoor exposure; Vicenza stone; cultural heritage
Settore CHIM/02 - Chimica Fisica
Settore CHIM/01 - Chimica Analitica
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/808660
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