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بررسی عملکرد رزین‌های تانن پایه در مقایسه با رزین ملامین فرمالدئید در بهبود ویژگی‌های فیزیکی و مکانیکی چوب | ||
| نشریه جنگل و فرآورده های چوب | ||
| دوره 76، شماره 4، اسفند 1402، صفحه 379-392 اصل مقاله (1.56 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/jfwp.2024.368424.1268 | ||
| نویسندگان | ||
| خدیجه دلاوریان عباس آبادی1؛ اصغر طارمیان* 1؛ رضا اولادی1؛ غلامرضا رحمانی2 | ||
| 1گروه علوم و صنایع چوب و کاغذ، دانشکدۀ منابع طبیعی، دانشگاه تهران، کرج، ایران. | ||
| 2پژوهشکدۀ حفاظت و مرمت آثار تاریخی-فرهنگی، پژوهشگاه میراث فرهنگی و گردشگری، تهران، ایران. | ||
| چکیده | ||
| عملکرد رزین های تانن عاری از فرمالدهید و تانن-رزورسینول-فرمالدهید در مقایسه با رزین ملامین فرمالدهید به‌منظور اصلاح ویژگی‌های فیزیکی و مکانیکی چوب بلوط بلندمازو (Quercus castaneifolia) مورد بررسی قرار گرفت. رزین ملامین فرمالدهید تا غلظت 25 درصد رقیق شد و متعاقباً از 5 درصد کاربامید برای کاهش ویسکوزیته آن استفاده شد. محلول آبی 30 درصد تانن متراکم به‌همراه محلول 33 درصد هیدروکسید سدیم و 6 درصد هگزامین (بر مبنای وزن خشک تانن) نیز برای تهیة رزین تانن عاری از فرمالدهید در محدودة pH 10 مورد استفاده قرار گرفت. رزین تانن-رزورسینول-فرمالدهید نیز در pH برابر با 8 سنتز شد. پس از اشباع نمونه های چوبی با فرآیند سلول خالی و خشک کردن آنها با یک برنامة رطوبت پایه، گیرائی رزین در آون در دمای 2±103 درجة سانتی‌گراد به‌مدت 48 ساعت و سپس در دمای 120 درجة سانتی‌گراد به‌مدت 4 ساعت انجام شد. نتایج نشان داد که اصلاح چوب با هر سه نوع رزین منجر به کاهش رطوبت تعادل، بهبود پایداری ابعاد و آب‌گریزی سطح می شود ولی بر سختی و مدول الاستیسیته آن تأثیر معنی داری ندارد. درصد افزایش وزن چوب پس از اصلاح با رزین ملامین فرمالدهید (23/8 درصد) تقریباً دو برابر مقدار آن در چوب اصلاح شده با رزین های تانن پایه بود. رزین ملامین فرمالدهید عملکرد مطلوبتری در مقایسه با رزین های تانن پایه داشت، ضمن اینکه شدت تغییر رنگ چوب پس از اصلاح نیز کمتر بود. فرآیند اصلاح با رزین تانن-رزورسینول-فرمالدهید در مقایسه با رزین تانن عاری از فرمالدهید در بهبود ویژگی ها، با موفقیت بیشتری همراه بود. | ||
| کلیدواژه‌ها | ||
| آب‌گریزی؛ اصلاح چوب؛ دوست‌دار محیط‌زیست؛ سختی؛ مدول‌الاستیسیته | ||
| عنوان مقاله [English] | ||
| The performance of tannin-based resins in comparison with melamine-formaldehyde resin for improving the physical and mechanical properties of wood | ||
| نویسندگان [English] | ||
| Khadijeh Delavaryan Abbas Abadi1؛ Asghar Tarmian1؛ Reza Oladi1؛ Gholam Reza Rahmani2 | ||
| 1Department of Wood and Paper Science and Technology, Faculty of Natural Resources, University of Tehran, Karaj, Iran. | ||
| 2Institute of Conservation and Restoration of Historical-Cultural Artifacts, Research Institute of Cultural Heritage and Tourism (RICHT), Tehran, Iran. | ||
| چکیده [English] | ||
| The performance of formaldehyde-free tannin and tannin-resorcinol-formaldehyde resins was investigated in comparison with melamine-formaldehyde resin to improve the physical and mechanical characteristics of oak wood. Melamine-formaldehyde resin was diluted to a concentration of 25% and then 5% carbamide was added to reduce its viscosity. For the synthesis of formaldehyde-free tannin resin, condensed tannin powder with a concentration of 30% in distilled water was used, and the pH was adjusted to the range of 10 using a 33% solution of sodium hydroxide in water. Tannin-resorcinol-formaldehyde resin was also synthesized at pH 8. After impregnation of the wood samples using the empty cell process and drying them with a moisture-based schedule, the resins were cured in an oven at a temperature of 103 ± 2°C for 48 hours and then at a temperature of 120°C for 4 hours. The results showed that modifying wood with all three types of resin leads to a decrease in equilibrium moisture content, improvement in dimensional stability, and surface water repellency. However, it does not have a significant effect on the hardness and modulus of elasticity of the wood. The weight percent gain after modification with melamine-formaldehyde resin (23.8%) was almost twice its value for wood modified with tannin-based resins. Melamine-formaldehyde resin had a better performance in comparison with tannin-based resins, while the intensity of wood color change after modification was also less. The modification process with tannin-resorcinol-formaldehyde resin was more successful in improving the properties compared to formaldehyde-free tannin resin. | ||
| کلیدواژه‌ها [English] | ||
| Environmentally friendly, Hardness, Modulus of elasticity, Water repellency, Wood modification | ||
| مراجع | ||
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