期刊
PROGRESS IN ORGANIC COATINGS
卷 159, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.porgcoat.2021.106434
关键词
Natural stone protection; Zein; Bio-based coating; Spray coating; Hydrophobic performance
资金
- Center for Cultural Heritage Technology (CCHT@Ca'Foscari) of the Italian Institute of Technology
- Universita degli Studi di Trieste
This study evaluated the efficiency of an ecofriendly zein solution in DMSO as a protective material for stone, showing that it can create a hydrophobic coating with micro-scale roughness. Accelerated aging tests demonstrated good resistance to aging in terms of hydrophobicity and color variations, making it a valuable alternative to synthetic treatments for stone protection.
In the present work, the efficiency of an ecofriendly 5% (w/v) solution of zein in DMSO was evaluated as protective material for stone. The solution was sprayed on 5 x 5 x 1 cm slabs of Serena stone, a sandstone widely used in Florentine architecture, in order to create a hydrophobic coating. The obtained coating turned out to be hydrophobic, showing WCA of around 120 degrees, while a reduction of 8.4% in water uptake was observed during 15 days. SEM and profilometer analyses stated that the zein coating application resulted in the formation of a compact film on the stone's surface with a continuous structure characterized by micro-scale roughness. XPS analysis confirmed the presence of the thin conformal layer over the stone. A mechanism of hydrophobic surface formation, in which both the roughness and the solvent's evaporation style are believed to play a significant role, was finally proposed. Accelerated aging tests indicated a good resistance to aging in terms of hydrophobicity and color variations, where the overall color parameter of Delta E < 2.0 was maintained, indicating invisible color changes to the naked eye. This sustainable approach can be easily scaled and may represent a valuable alternative to the most common synthetic treatments used nowadays in stone protection.
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