بررسی عملکرد پوشش‌های سیلیکونی و اپوکسی برای حفاظت چوب در مقابل باکتری و هوازدگی

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه مهندسی علوم و صنایع چوب و کاغذ، دانشکد‌گان کشاورزی و منابع طبیعی، دانشگاه تهران، ایران، صندوق پستی: 77871-31587

10.30509/jcst.2024.167309.1226

چکیده

در این تحقیق، عملکرد پوشش سیلیکونی پلی‌دی‌متیل‌سیلوکسان (PDMS) و اپوکسی بر بهبود خواص ضدمیکروبی در مقابل باکتری گرم منفی (Escherichia coli) و گرم مثبت (Staphylococcus aureus) و مقاومت به هوازدگی سطح چوب توس (Betula pendula) بررسی شد. دو نوع پوشش PDMS و اپوکسی با غلظت 15 درصد به ترتیب درون حلال هگزان و استن تهیه و به روش غوطه‌وری/ امواج فراصوت بر روی چوب اعمال شدند. هوازدگی تسریع شده با چرخ کهنگی گاردنر برای مدت 330 ساعت انجام شد و سپس اختلاف رنگ ((∆E، زبری، زاویه تماس و جذب آب روی نمونه‌ها اندازه‌گیری شد. پوشش PDMS ضخامت فیلم بیشتر و اپوکسی جذب بیشتر پلیمر را نشان داد. هردو نوع پوشش با کارایی بالای 60 درصد، ویژگی‌های ضدباکتریایی خوبی را نشان دادند؛ ولی پوشش PDMS در مقایسه با اپوکسی، آ‌ب‌گریزی بالاتر، جذب آب و تغییرات زبری کمتری را طی دوره هوازدگی ارائه داد. در نهایت، پوشش‌دهی با PDMS و اپوکسی به ترتیب به میزان 77 و 42 درصد، تغییرات رنگ ناشی از هوازدگی چوب را کاهش دادند.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Evaluation of Silicone and Epoxy Coatings for Wood Protection Against Bacterial Growth and Outdoor Weathering

نویسندگان [English]

  • Akbar Mastouri
  • Davood Efhami
  • Asghar Tarmain
College of Agriculture & Natural Resources, University of Tehran, P.O. Box: 31587-77871, Tehran, Iran
چکیده [English]

In this research, the performance of silicone (Polydimethylsiloxane, PDMS) and epoxy coatings for improving microbial resistance against Gram-negative (Escherichia coli) and Gram-positive (Staphylococcus aureus) bacteria and resistance to outdoor weathering of birch wood (Betula pendula) was investigated. PDMS and epoxy coating with a concentration of 15 % were prepared in hexane and acetone solvents, respectively, and applied on wood using the immersion/ultrasound method. Accelerated outdoor weathering was done with a Gardner aging wheel for 330 hours, and then the changes in color (∆E), roughness, wettability, and 24h-water absorption of samples were measured. While PDMS showed more coating film thickness, epoxy one showed more polymeric coating uptake. Both coatings showed good anti-bacterial properties with an efficiency of over 60 %. However, compared to epoxy, PDMS coating provided low water absorption, higher hydrophobicity, and less roughness changes through accelerated weathering. Overall, coating with PDMS and epoxy treatment reduced the color changes of wood during weathering by 77 % and 42 %, respectively.

کلیدواژه‌ها [English]

  • Wood coating PDMS Epoxy Wood weathering Anti
  • bacterial

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