Effects of Adding Nanosilica on Acrylic and Siloxane Hydrophobic Coatings to Protect Calcite Stones
Hypothesis: Both acrylic and siloxane polymers show good water-repellency when applied on the surface of mineral materials, such as bricks and stones. This property makes them an option to protect the porous surfaces of mineral, such as stone artworks. Another advantage of using these polymers is th...
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| Format: | Article |
| Language: | fas |
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Iran Polymer and Petrochemical Institute
2019-04-01
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| Series: | علوم و تکنولوژی پلیمر |
| Subjects: | |
| Online Access: | http://jips.ippi.ac.ir/article_1632_a027024e52dbfef38f96fc7d106b1e3b.pdf |
| _version_ | 1818403961548308480 |
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| author | Amir Ershad-Langroudi Nasim Azadi |
| author_facet | Amir Ershad-Langroudi Nasim Azadi |
| author_sort | Amir Ershad-Langroudi |
| collection | DOAJ |
| description | Hypothesis: Both acrylic and siloxane polymers show good water-repellency when applied on the surface of mineral materials, such as bricks and stones. This property makes them an option to protect the porous surfaces of mineral, such as stone artworks. Another advantage of using these polymers is their water-based feature and biodegradability. Methods: In this study, substrate was selected from calcium carbonate rocks of the stone artworks of Persepolis. By adding silica nanoparticles to acrylic and siloxane polymers, changes in the properties of coatings, applied on the surface of the mineral substrate, were investigated. For this purpose, the samples were subjected to various experimental tests, such as water absorption at different time intervals, color changes resulted from accelerated aging, hydrophobic behavior study using contact angle measurement, hardness test and TGA. Morphology and surface area of coatings were studied by scanning electron microscopy (SEM). Characterization of these materials was done by various analysis methods.Findings: The effectiveness of acrylic and siloxane polymers alone and also in comparison with each other and after adding nanosilica was evaluated by different tests. This study showed that the addition of silica particles to both polymers improved surface hydrophobic properties. In addition, the silica nanoparticles altered the surface morphology of the coating and increased surface roughness. In addition, silica nanoparticles improved the stability of coatings against accelerated aging conditions, resulting in less color changes after aging. The increase in nanosilica content also increased the average hardness and the thermal resistance of both polymer coatings. |
| first_indexed | 2024-12-14T08:32:34Z |
| format | Article |
| id | doaj.art-5a3bd3e143df4d309e127c9fe677b757 |
| institution | Directory Open Access Journal |
| issn | 1016-3255 2008-0883 |
| language | fas |
| last_indexed | 2024-12-14T08:32:34Z |
| publishDate | 2019-04-01 |
| publisher | Iran Polymer and Petrochemical Institute |
| record_format | Article |
| series | علوم و تکنولوژی پلیمر |
| spelling | doaj.art-5a3bd3e143df4d309e127c9fe677b7572022-12-21T23:09:29ZfasIran Polymer and Petrochemical Instituteعلوم و تکنولوژی پلیمر1016-32552008-08832019-04-01321152910.22063/jipst.2019.16321632Effects of Adding Nanosilica on Acrylic and Siloxane Hydrophobic Coatings to Protect Calcite StonesAmir Ershad-Langroudi0Nasim Azadi1Department of Color and Surface Coating, Faculty of Polymer Processing, Iran Polymer and Petrochemical Institute, P.O. Box 14975-112, Tehran, IranDepartment of Chemical Engineering, Faculty of Engineering, Tehran North Branch, Islamic Azad University, Postal code 1651153311, Tehran, IranHypothesis: Both acrylic and siloxane polymers show good water-repellency when applied on the surface of mineral materials, such as bricks and stones. This property makes them an option to protect the porous surfaces of mineral, such as stone artworks. Another advantage of using these polymers is their water-based feature and biodegradability. Methods: In this study, substrate was selected from calcium carbonate rocks of the stone artworks of Persepolis. By adding silica nanoparticles to acrylic and siloxane polymers, changes in the properties of coatings, applied on the surface of the mineral substrate, were investigated. For this purpose, the samples were subjected to various experimental tests, such as water absorption at different time intervals, color changes resulted from accelerated aging, hydrophobic behavior study using contact angle measurement, hardness test and TGA. Morphology and surface area of coatings were studied by scanning electron microscopy (SEM). Characterization of these materials was done by various analysis methods.Findings: The effectiveness of acrylic and siloxane polymers alone and also in comparison with each other and after adding nanosilica was evaluated by different tests. This study showed that the addition of silica particles to both polymers improved surface hydrophobic properties. In addition, the silica nanoparticles altered the surface morphology of the coating and increased surface roughness. In addition, silica nanoparticles improved the stability of coatings against accelerated aging conditions, resulting in less color changes after aging. The increase in nanosilica content also increased the average hardness and the thermal resistance of both polymer coatings.http://jips.ippi.ac.ir/article_1632_a027024e52dbfef38f96fc7d106b1e3b.pdfstoneacrylic copolymersiloxanenanoparticlessilicawater repellent |
| spellingShingle | Amir Ershad-Langroudi Nasim Azadi Effects of Adding Nanosilica on Acrylic and Siloxane Hydrophobic Coatings to Protect Calcite Stones علوم و تکنولوژی پلیمر stone acrylic copolymer siloxane nanoparticles silica water repellent |
| title | Effects of Adding Nanosilica on Acrylic and Siloxane Hydrophobic Coatings to Protect Calcite Stones |
| title_full | Effects of Adding Nanosilica on Acrylic and Siloxane Hydrophobic Coatings to Protect Calcite Stones |
| title_fullStr | Effects of Adding Nanosilica on Acrylic and Siloxane Hydrophobic Coatings to Protect Calcite Stones |
| title_full_unstemmed | Effects of Adding Nanosilica on Acrylic and Siloxane Hydrophobic Coatings to Protect Calcite Stones |
| title_short | Effects of Adding Nanosilica on Acrylic and Siloxane Hydrophobic Coatings to Protect Calcite Stones |
| title_sort | effects of adding nanosilica on acrylic and siloxane hydrophobic coatings to protect calcite stones |
| topic | stone acrylic copolymer siloxane nanoparticles silica water repellent |
| url | http://jips.ippi.ac.ir/article_1632_a027024e52dbfef38f96fc7d106b1e3b.pdf |
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