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

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مجله علوم و تکنولوژی پلیمر
دوره 32، شماره 1 - شماره پیاپی 159
فروردین و اردیبهشت 1398
صفحه 15-29

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