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بهبود مقاومت چسبندگی پوشش‌های آلکیدی و پلی‌اورتان با استفاده از ترکیبات سیلانی به روش سل‌ژل | ||
| تحقیقات علوم چوب و کاغذ ایران | ||
| مقاله 2، دوره 32، شماره 3 - شماره پیاپی 60، آبان 1396، صفحه 322-333 اصل مقاله (343.55 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/ijwpr.2017.108093.1367 | ||
| نویسندگان | ||
| هادی غلامیان1؛ اصغر طارمیان* 2؛ علی عبدالخانی2 | ||
| 1استادیار، گروه علوم و صنایع چوب و کاغذ، دانشگاه تهران | ||
| 2دانشیار، گروه علوم و صنایع چوب و کاغذ، دانشگاه تهران | ||
| چکیده | ||
| در این تحقیق بهبود مقاومت چسبندگی پوشش‌های آلکیدی و پلی اورتان بر روی چوب صنوبر (Populus nigra) با استفاده از پوشش میانی نانو سیلانی به روش سل‌ژل برای کاربرد در فضای باز مورد ارزیابی قرار گرفت. برای این منظور نمونه‌هایی به ابعاد 2×10×15 میلیمتر مطابق با استاندارد 5-927 EN بریده شد. پس از اصلاح سطح نمونه‌ها با پوشش سل‌ژل تترا اتوکسی سیلان، پوشش‌های آلکیدی و پلی‌اورتان با دستگاه فیلم‌کش اعمال شد و نمونه‌های آماده شده به مدت 8 ماه مطابق استاندارد 877 ISO بر روی سکوی هوازدگی به طرف جنوب با شیب 36 درجه قرار داده شدند. کیفیت پوشش‌دهی با استفاده از آزمون‌های رنگ‌سنجی، چسبندگی کششی، چسبندگی خراشی و آزمون طیف‌سنجی مادون قرمز (FTIR-ATR) قبل و بعد از هوازدگی مورد بررسی قرار گرفت. نتایج مطالعات طیف‌سنجی نشان داد که نانو ذرات تشکیل شده در سطح چوب در اثر فرآیند سل‌ژل ماهیت سیلانی (2SiO) دارند و گروه‌های –OH سطح چوب با این گروه‌های سیلانی واکنش داده‌اند. اصلاح سطح چوب با فرایند سل‌ژل موجب شد تا مقاومت چسبندگی پوشش‌های آلکیدی و پلی‌اورتان کمتر تحت تاثیر هوازدگی قرار گرفته و ثبات رنگی پوشش‌ها افزایش یابد. بیشترین مقاومت چسبندگی کششی و خراشی مربوط به پوشش ترکیبی سل‌ژل و پلی-اورتان بود. | ||
| کلیدواژه‌ها | ||
| سل‌ژل؛ پوشش؛ آلکیدی؛ پلی‌اورتان؛ چسبندگی؛ هوازدگی | ||
| عنوان مقاله [English] | ||
| Improvement of adhesion strength of polyurethane and alkyd coatings by nano-silane using sol-gel method | ||
| نویسندگان [English] | ||
| Hadi gholamian1؛ Asghar Tarmian2؛ Ali Abdulkhani2 | ||
| 1Assistant Professor, Department of Wood and Paper Science & Technology, Faculty of Natural Resources, University of Tehran, Karaj, Iran | ||
| 2Associate Professor, Department of Wood and Paper Science & Technology, Faculty of Natural Resources, University of Tehran, Karaj, Iran, | ||
| چکیده [English] | ||
| In present study, the adhesion strength of polyurethane and alkyd coatings on the poplar wood (Populus nigra) was improved by nano-silane coating using sol-gel method for outdoor application. For this purpose, the boards with dimensions of 15 × 10 × 2 mm were prepared according to EN 927-5. The surfaces of wood specimens were modified with Tetraethoxysilane (T) sol-gel material and then, solvent-borne alkyd (AS) and solvent-borne polyurethane (PS) coatings were applied. The coated samples were placed outdoor on a platform with a slope close to Karaj latitude (36̊) for 8 months according to ISO 877 standard. In order to characterize the quality of the coatings, colorimetric, tensile adhesion (Pull off), scratch adhesion (Cross cut) and ATR-FTIR tests were performed before and after weathering. The ATR-FTIR analysis demonstrated that the wood surface was covered with silicon oxides (SiO2) attached to hydrocarbon chains. As a result of surface wood modification by sol-gel, the color and adhesion strength of polyurethane and alkyd coatings were less affected by weathering. The highest tensile and scratch adhesions were found for the combined sol-gel and polyurethane coatings. | ||
| کلیدواژه‌ها [English] | ||
| sol-gel, alkyd and polyurethane coating, Adhesion, weathering | ||
| مراجع | ||
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