آثار افزودن نانوسیلیکا بر پوشش‌های آب‌گریز آکریلی و سیلوکسانی برای محافظت از سنگ‌های کلسیتی

نوع مقاله: پژوهشی

نویسندگان

1 تهران، پژوهشگاه پلیمر و پتروشیمی ایران، پژوهشکده فرایند، گروه رنگ و روکش‌های سطح، صندوق پستی 112-14975

2 تهران، دانشگاه آزاد اسلامی، واحد تهران شمال، دانشکده فنی و مهندسی، گروه مهندسی شیمی، کد پستی 1651153311

چکیده

فرضیه: دو نوع پلیمر آکریلی و سیلوکسانی عملکرد خوبی در دفع آب از سطح ماده معدنی مانند سنگ دارند. این خاصیت سبب می‌شود، آن‌ها گزینه‌های مطرح برای حفاظت از سطوح متخلخل معدنی مانند سطح آثار سنگی باشند. مزیت دیگر استفاده از این کوپلیمرها، آب‌پایه بودن و زیست‌تخریب‌پذیری آن‌هاست.
روش‌ها: در این مطالعه، سنگ‌های کلسیم کربنات برای بستر استفاده شدند. با اضافه‌کردن نانوذرات سیلیکا به دو نوع پلیمر آکریلی و سیلوکسانی، تغییر خواص پوشش‌ها بر سطح ماده معدنی بررسی شد. بدین منظور، نمونه‌ها با آزمون‌های مختلف نظیر جذب آب در زمان‌های مختلف، تغییر رنگ در اثر پیرسازی شتاب‌یافته، بررسی رفتار آب‌گریزی با اندازه‌گیری زاویه تماس، سختی‌سنجی و گرماوزن‌سنجی بررسی شدند. شکل‌شناسی و سطح مقطع پوشش‌ها با میکروسکوپ الکترونی پویشی (SEM) مطالعه شد. شناسایی این مواد با آزمون‌های مختلف انجام شد.
یافته‌ها:‌ کارایی دو پلیمر آکریلی و سیلوکسانی به‌تنهایی و نیز در مقایسه با هم و پس از افزودن نانوسیلیکا با آزمون‌های مختلف ارزیابی شد. این مطالعه نشان داد، افزودن ذرات سیلیکا به هر دو پلیمر خواص آب‌گریزی سطح را بهبود می‌بخشد. همچنین، نانوذرات سیلیکا، شکل‌شناسی سطح پوشش را تغییر داده و باعث افزایش زبری سطح می‌شوند. افزون بر این، نانوذرات سیلیکا پایداری پوشش‌ها را در برابر شرایط پیرسازی شتاب‌یافته، بهبود می‌بخشند و سبب تغییرات رنگ کمتری پس از پیرسازی می‌شوند. همچنین، افزایش نانوذرات سیلیکا میانگین سختی اندازه‌گیری‌شده در هر دو نوع پوشش پلیمری را افزایش داده و سبب افزایش مقاومت گرمایی پوشش‌ها نیز می‌شوند.

کلیدواژه‌ها


عنوان مقاله [English]

Effects of Adding Nanosilica on Acrylic and Siloxane Hydrophobic Coatings to Protect Calcite Stones

نویسندگان [English]

  • Amir Ershad-Langroudi 1
  • Nasim Azadi 2
1 Department of Color and Surface Coating, Faculty of Polymer Processing, Iran Polymer and Petrochemical Institute, P.O. Box 14975-112, Tehran, Iran
2 Department of Chemical Engineering, Faculty of Engineering, Tehran North Branch, Islamic Azad University, Postal code 1651153311, Tehran, Iran
چکیده [English]

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.

کلیدواژه‌ها [English]

  • stone
  • acrylic copolymer
  • siloxane
  • nanoparticles
  • silica
  • water repellent
  1. Varas-Muriel M.J., Pérez-Monserrat E.M., Vázquez-Calvo C., and Fort R., Effect of Conservation Treatments on Heritage Stone. Characterisation of Decay Processes in a Case Study, Constr. Build. Mater., 95, 611-22, 2015.
  2. Fatorić S. and Seekamp E., Are Cultural Heritage and Resources Threatened by Climate Change? A Systematic Literature Review, Clim. Change, 142, 227-54, 2017.
  3. Heidari M., Torabi-Kaveh M., Chastre C., Ludovico-Marques M., Mohseni H., and Akefi H., Determination of Weathering Degree of the Persepolis Stone under Laboratory and Natural Conditions Using Fuzzy Inference System, Conster. Build. Mater., 145, 28-41, 2017.
  4. Behpour S. and Givechi S., Crisis Management in the Persepolis World Heritage Complex (A Case Study about Drought), Int. J. Appl. Arts Stud. (IJAPAS), 2, 44-56, 2018.
  5. Shekofteh A., Molina E., Arizzi A., Cultrone G., Ahmadi H., and Yazdi M., Characterization and Damage Assessment of Stones Used in the Pasargadae World Heritage Site, Achaemenian Period, Int. J. Archit. Herit., 1-6, 2018, DOI: org/10.1080/15583058.2018.1436728.
  6. Gallello G., Ghorbani S., Ghorbani S., Pastor A., and de la Guardia M., Non-destructive Analytical Methods to Study the Conservation State of Apadana Hall of Persepolis, Sci. Total Environ., 544, 291-8, 2016.
  7. Krage L., Research and Investigation of Historic Materials in Latvia, http://www.arcchip.cz/w90/w90-krage. pdf, Accessed Online February 2009.
  8. Fadai H., Pathology of the Brick-Made Dome of Nezammolk Khage in Isfahan Mosque and Choghazanbil Temple, MSc Thesis, Art University of Isfahan, Iran, 2000.
  9. Gholipour-Shahraki M. and Mohammadi P., The Study of Growth of Calogaya sp. PLM8 on Cyrus the Great’s Tomb, UNESCO World Heritage Site in Iran, Int. J. Environ. Res., 11, 501-13, 2017.
  10. Sohrabi M., Favero-Longo SE, Pérez-Ortega S., Ascaso C., Haghighat Z., Talebian M.H., Fadaei H., and de los Ríos A., Lichen Colonization and Associated Deterioration Processes in Pasargadae, UNESCO World Heritage Site, Iran, Int. Biodeter. Biodegrad., 117, 171-82, 2017.
  11. Ershad-Langroudi A., Fadaei H., and Ahmadi K., A Survey on Applications of Polymeric Nanomaterials for Conservation of Artworks, Iran. J. Polym. Sci. Technol. (Persian), 30, 371-389, 2018.
  12. Michoinova D., New Materials for the Protection of Cultural Heritage, http://www.arcchip.cz/w10/w10-michoinova.pdf, Accessed Online February 2007.
  13. Sadat-Shojai M. and Ershad-Langroudi A., Polymeric Coatings for Protection of Historic Monuments: Opportunities and challenges, J. Appl. Polym. Sci., 112, 2535-2551, 2009.
  14. Ershad-langroudi A., Polymeric Materials in Restoration and Preservation of Historical Monument, Proceedings of 9th International Conference on the Study and Conversation of Earthen Architecture, Terra, Yazd, Iran, 357-362, 2003.
  15. Amin-Shirazi Nejad Sh., Investigation of Paraloid as Adhesive and Consolidant Material at Climatic Conditions of Iran, MSc Thesis, Art University of Isfahan, Iran, 1998.
  16. Carretti E., Dei L., and Baglioni P., Solubilization of Acrylic and Vinyl Polymers in Nanocontainer Solutions, Application of Microemulsions and Micelles to Cultural Heritage Conservation, Langmuir, 19, 7867-72, 2003.
  17. Zielecka M. and Bujnowska E., Silicone-Containing Polymer Matrices as Protective Coatings: Properties and Applications, Prog. Org. Coat., 55, 160-167, 2006.
  18. Constâncio C., Franco L., Russo A., Anjinho C., Pires J., Vaz M.F., Carvalho A.P., Studies on Polymeric Conservation Treatments of Ceramic Tiles with Paraloid B-72 and Two Alkoxysilanes, J. Appl. Polym. Sci., 116, 2833-2839, 2010.
  19. da Fonseca B.S., Pinto A.P., Piçarra S., and de Fátima Montemor M., Challenges of Alkoxysilane-Based Consolidants for Carbonate Stones: From Neat TEOS to Multipurpose Hybrid Nanomaterials, Advanced Materials for the Conservation of Stone, Springer, Cham, 185-207, 2018.
  20. Ershad-Langroudi A., Mai C., Vigier G., and Vassoille R., Hydrophobic Hybrid Inorganic-Organic Thin Film Prepared by Sol-Gel Process for Glass Protection and Strengthening Applications, J. Appl. Polym. Sci., 65,2387-2393, 1997.
  21. Columbu S., Lisci C., Sitzia F., and Buccellato G., Physical–mechanical Consolidation and Protection of Miocenic Limestone Used on Mediterranean Historical Monuments: the Case Study of Pietra Cantone (Southern Sardinia, Italy), Environ. Earth Sci., 76, 148, 2017.
  22. Ershad-Langroudi A., Nanocomposite Hybrid Coatings for Conservation of Archeological Objects, Proceedings of the 6th Iranian Seminar on Polymer Science and Technology, Tehran, Iran, 349, 2003.
  23. Karapanagiotis I. and Hosseini M., Superhydrophobic Coatings for the Protection of Natural Stone, Advanced Materials for the Conservation of Stone, Springer, Cham, 1-25, 2018.
  24. da Fonseca B.S., Pinto A.F., Piçarra S., and Montemor M.F., The Potential Action of Single Functionalization Treatments and Combined Treatments for the Consolidation of Carbonate Stones, Constr. Build. Mater., 163, 586-99, 2018.
  25. Karatasios I., Michalopoulou A., Amenta M., and Kilikoglou V., Modification of Water Transport Properties of Porous Building Stones Caused by Polymerization of Silicon-Based Consolidation Products, Pure Appl. Chem., 89, 1673-84, 2017.
  26. Chelazzi D., Camerini R., Giorgi R., and Baglioni P., Nanomaterials for the Consolidation of Stone Artifacts, Advanced Materials for the Conservation of Stone, Springer, Cham, 151-173, 2018.
  27. Gheno G., Badetti E., Brunelli A., Ganzerla R, and Marcomini A., Consolidation of Vicenza, Arenaria and Istria stones: A Comparison Between Nano-Based Products and Acrylate Derivatives, J. Cult. Herit. 2018, DOI: org/10.1016/j.culher.2018.02.013.
  28. Aslanidou D., Karapanagiotis I., and Panayiotou C., Tuning the Wetting Properties of Siloxane-Nanoparticle Coatings to Induce Superhydrophobicity and Superoleophobicity for Stone Protection, Mater. Design, 108, 736-44, 2016.
  29. Aldoasri M.A., Darwish S., Adam M., Elmarzugi N., and Ahmed S., Performance of Clay, SiO2, Ca(OH)2 and CaCO3-Polymeric Nanocomposites for Conservation and Preservation of Limestone Artworks, Preprints, 2018, DOI: 10.20944/preprints 201803.0055.v1.
  30. Tesser E., Antonelli F., Sperni L., Ganzerla R., and and Maravelaki N.P., Study of the Stability of Siloxane Stone Strengthening Agents, Polym. Degrad. Stab., 110, 232-240, 2014.
  31. Ershad-Langroudi A. and Sadat-Shojai M., Siloxane-Based Coatings as Potential Materials for Protection of Brick-Made Monuments, J. Color Sci. Technol., 3, 177-187, 2009.
  32. Li D., Xu F., Liu Z., Zhu J., Zhang Q., and Shao L., The Effect of Adding PDMS-OH and Silica Nanoparticles on Sol–Gel Properties and Effectiveness in Stone Protection, Appl. Surf. Sci., 266, 368-374, 2013.
  33. Doehne E. and Price C.A., Stone Conservation: An Overview of Current Research, Getty, California, 2nd ed., 2, 164, 2011.
  34. Ershad-Langroudi A., Fadaii H., and Ahmadi K., Silane/Siloxane Surface Treatment for Cohesion Ability and Strengthening Agent of Historical Stone, Constr. Sci. J., 1, 23-31, 2017.
  35. Bergamonti L., Bondioli F., Alfieri I., Alinovi S., Lorenzi A., Predieri G., and Lottici P.P., Weathering Resistance of PMMA/SiO2/ZrO2 Hybrid Coatings for Sandstone Conservation, Polym. Degrad. Stab., 147, 274-283, 2018.
  36. Castelvetro V., De Vita C., Chiantore O., Scalarone D., and Giannini G., Water-borne Organic and Hybrid Nanostructured Polymer Particles as Film-Forming Materials for the Consolidation and Protection of Porous Substrates, Sci. Technol. Cult. Herit., 13,1000-1010, 2004.
  37. Mazzola M., Frediani P., Bracci S., and Salvini A., New Strategies for the Synthesis of Partially Fluorinated Acrylic Polymers as Possible Materials for the Protection of Stone Monuments, Eur. Polym.  J.39, 1995-2003, 2003.
  38. Lei H., He D., Guo Y., Tang Y., and Huang H., Synthesis and Characterization of UV-Absorbing Fluorine-Silicone Acrylic Resin Polymer, Appl. Surf. Sci., 442, 71-77, 2018.
  39. Ershad-Langroudi A. and Rahimi A., Introduction on Hybrid Nanocomposite Coatings, Naghsh Bian, Tehran, Chapt. 2, 2010.
  40. http://www.guardindustry.com, Available 20 May 2019.
  41. http://www.glassflake.com/pages/products/by-product-type/glassflake/ecr-glassflake, Available 20 May 2019.
  42. Beheshtifar M., Technical Studies Providing a Protective Mechanism Stone Plinth Period Ghajar of Hazrat Masomeh (S) Transferred to The Green Dom, MSc Thesis, Islamic Azad University, Summer 2015.
  43. Beheshtifar M., Ershad-Langroudi A., and Fadaii H., Conservation Evaluation of Three Protective Siloxane Coatings on a Limestone Sample, Second Conference on Materials Science and Protection of Historical and Cultural Monuments, Iranian Research Institute for Cultural Heritage, Tehran, Iran,
    -3 May, 2016.
  44. Buxbaum G., Industrial Inorganic Pigments, Wiley-VCH, New York, 24-37, 1998.
  45. Chiantore O. and Lazzari M., Photo-Oxidative Stability of Paraloid Acrylic Protective Polymers, Polymer, 42, 17-27, 2001.
  46. Alessandrini G., Toniolo L., and Colombo C., Partially Fluorinated Acrylic Copolymers as Coating for Calcareous Stone Materials, Stud. Conserv., 45, 1-6, 2000.
  47. Toniolo L., Della Volpe C., Brugnara M., and Poli T., Partially Fluorinated Acrylic Copolymers as Coatings for Stone Protection: Characterization and Surface Properties, MRS Proceedings, Cambridge University, 712, II3-3, 2002.
  48. Ershad-Langroudi A. and Rahimi A., Synthesis and Characterization of Nanosilica-Based Coatings for Protection of Antique Articles, Int. J. Nanotechnol., 6, 915-925, 2009.
  49. Mohammadi F. and Ershad-Langroudi A., Structural Characteristics and Corrosion Behavior of Acrylic/Silica Nanocomposite Coatings, Adv. Mat. New Coat. (AMNC), 9, 643-652, 2014.
  50. Corcione C.E., Manno R., and Frigione M., Sunlight Curable Boehmite/Siloxane-Modified Methacrylicnano-Composites: An Innovative Solution for the Protection of Carbonate Stones, Prog. Org. Coat., 97, 222-232, 2016.
  51. Bakhshandeh E., Jannesari A., Ranjbar Z., Sobhani S., and Saeb M.R., Anti-corrosion Hybrid Coatings Based on Epoxy–Silica Nano-Composites: Toward Relationship between the Morphology and EIS Data, Prog. Org. Coat., 77, 169-183, 2014.