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Coatings 2018, 8(8), 283; https://doi.org/10.3390/coatings8080283

Waterborne Acrylate-Based Hybrid Coatings with Enhanced Resistance Properties on Stone Surfaces

1
Department of Chemical Engineering Materials Environment (DICMA) and Research Center in Science and Technology for the Preservation of Historical-architectural Heritage (CISTeC), Sapienza University of Rome, Rome 00184, Italy
2
Department of Applied Chemistry, University of the Basque Country, Donostia-San Sebastián 20018, Spain
3
Department of Basic and Applied Sciences for Engineering (SBAI), Sapienza University of Rome, Rome 00161, Italy
*
Authors to whom correspondence should be addressed.
Received: 10 July 2018 / Revised: 2 August 2018 / Accepted: 11 August 2018 / Published: 15 August 2018
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Abstract

The application of coating polymers to building materials is a simple and cheap way to preserve and protect surfaces from weathering phenomena. Due to its environmentally friendly character, waterborne coating is the most popular type of coating, and improving its performance is an important key of research. The study presents the results regarding the mechanical and photo-oxidation resistance of some water-based acrylic coatings containing SiO2 nanoparticles obtained by batch miniemulsion polymerization. Coating materials have been characterized in terms of hydrophobic/hydrophilic behavior, mechanical resistance and surface morphology by means of water-contact angle, and scrub resistance and atomic force microscopy (AFM) measurements depending on silica-nanoparticle content. Moreover, accelerated weathering tests were performed to estimate the photo-oxidation resistance of the coatings. The chemical and color changes were assessed by Fourier-transform infrared spectroscopy (FTIR) and colorimetric measurements. Furthermore, the nanofilled coatings were applied on two different calcareous lithotypes (Lecce stone and Carrara Marble). Its properties, such as capillary water absorption and color modification, before and after accelerated aging tests, were assessed. The properties acquired by the addition of silica nanoparticles in the acrylic matrix can ensure good protection against weathering of stone-based materials. View Full-Text
Keywords: waterborne coatings; batch miniemulsion; weathering; stone preservation waterborne coatings; batch miniemulsion; weathering; stone preservation
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Sbardella, F.; Pronti, L.; Santarelli, M.L.; Asua Gonzàlez, J.M.; Bracciale, M.P. Waterborne Acrylate-Based Hybrid Coatings with Enhanced Resistance Properties on Stone Surfaces. Coatings 2018, 8, 283.

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