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اثر افزودن چند ماده گرافیتپایه به چسب اوره فرمآلدهید در خواص حرارتی و مکانیکی تخته فیبر نیمهسنگین (MDF) | ||
| تحقیقات علوم چوب و کاغذ ایران | ||
| مقاله 3، دوره 38، شماره 2 - شماره پیاپی 83، تیر 1402، صفحه 100-113 اصل مقاله (806.78 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/ijwpr.2023.354899.1687 | ||
| نویسندگان | ||
| رضا جزایری1؛ سعید کاظمی نجفی* 2؛ حبیب الله یونسی3 | ||
| 1دانشآموخته دکتری علوم و مهندسی چوب و صنایع سلولزی، دانشکده منابع طبیعی و علوم دریایی، دانشگاه تربیت مدرس، نور، ایران | ||
| 2استاد، علوم و مهندسی چوب و صنایع سلولزی ، دانشکده منابع طبیعی و علوم دریایی، دانشگاه تربیت مدرس، نور، ایران | ||
| 3استاد، گروه محیط زیست، دانشکده منابع طبیعی و علوم دریایی، دانشگاه تربیت مدرس، نور، ایران | ||
| چکیده | ||
| در این پژوهش هدف استفاده از گرافیت و گرافیت اصلاحشده به عنوان افزودنی چندمنظوره در رزین اوره فرمآلدهید جهت ارتقاء خواص تخته فیبر نیمهسنگین (MDF) بود. بدینمنظور گرافیت انبساطیافته (EG) از گرافیت (G) به روش Tsai و همکاران (2011) تولید شد. سپس بوسیله فرآیند بینلایهای با منگنز دیاکسید با روش Schwarz و همکاران (1995) اصلاح و به MnO2-EG تبدیل گردید. هر ماده افزودنی در سه مقدار مصرف 1، 2 و 3 درصد به رزین اوره فرمآلدهید افزوده و تخته فیبر نیمهسنگین(MDF) با دانسیته اسمیkg/m3 750 ساخته شد. برای هر تیمار 3 تکرار در نظر گرفته شد بنابراین به همراه شاهد مجموعأ 27 تخته ساخته شد. در طول زمان پرس، زمان رسیدن به دمای OC100 (پارامتر(tT100oc لایه میانی تخته تحت تأثیر ماده افزودنی بوسیله ترمومتر بر پایه تروموکوپل کروم-نیکل تعیین شد. تیمار MnO2-EG3 (مقدار 3 درصد گرافیت انبساطیافته اصلاحشده) بیشترین تاثیر را در کاهش زمان رسیدن لایه میانی تخته به دمای OC100 به میزان 22 درصد نشان داد. بهعلاوه افزایش مدول الاستیسته به میزان 68 درصد در نتیجه این تیمار حاصل شد. افزودنیهای G و EG میزان بالاتری از چسبندگی داخلی را نسبت به افزودنی MnO2-EG نشان دادند. در این خصوص تیمارهای EG2 و EG3 42 و تیمار G2 40 درصد افزایش در چسبندگی داخلی را نشان دادند. تاثیر تیمار EG2 در بهبود واکشیدگی ضخامت 24 ساعت بیشتر از سایر تیمارها بود بهطوری که باعث حدود 19 درصد کاهش در مقایسه با شاهد شد. | ||
| کلیدواژهها | ||
| تخته فیبر نیمه سنگین(MDF)؛ رزین اوره فرم آلدهید؛ گرافیت؛ گرافیت انبساطیافته؛ tT100oc؛ خواص مکانیکی | ||
| عنوان مقاله [English] | ||
| Effect of Adding Several Graphite-Based Materials to Urea Formaldehyde Adhesive on Thermal and Mechanical Properties of MDF board | ||
| نویسندگان [English] | ||
| Reza Jazayeri1؛ Saeed Kazemi Najafi2؛ Habibollah Younesi3 | ||
| 1Wood science and technology department, Tarbiat modares university, Noor, Iran | ||
| 2Prof., Department of Wood and Paper Sciences, Faculty of Natural Resources, Tarbiat Modares University, Noor, Iran | ||
| 3Prof., Department of Environment Sciences, Faculty of Natural Resources, Tarbiat Modares University, Noor | ||
| چکیده [English] | ||
| This study aimet at to use modified graphite materials as a multifunction additive in the UF resin for improving the properties of medium density fiberboard (MDF). For this purpose expanded graphite EG was synthesized from graphite using the Tsai et al (2011) method. Then, as-synthesized EG was intercalated with manganese dioxide by Schwarz et al (1995) method and converted to MnO2-EG. Any additive was added to the urea formaldehyde resin in three doses of 1, 2 and 3% to make the relevant MDF panels with 750 kg/m3 nominal density. During the pressing time, the tT100oc parameter (time to reach temperature100○C) of the middle layer of the board under the influence of the additive was determined by a chromium-nickel-based thermocouple. The treatment of MnO2-EG3 (amount of 3% modified expanded graphite) showed the greatest effect in reducing tT100°C of the middle layer of the board by 22%. In addition, the elastic modulus increased by 68% as a result of this treatment. In addition, the elastic modulus increased by 68% as a result of this treatment. G and EG additives showed a higher degree of internal adhesion than that of MnO2-EG additive. In this regard, EG2 and EG3 treatments showed a 42% increase in internal adhesion and G2 treatment showed a 40% increase in internal adhesion. The effect of EG2 treatment in improving SW24 was greater than other treatments, so that it caused a 19% decrease compared to the control. | ||
| کلیدواژهها [English] | ||
| Medium density fiberboard (MDF), Urea formaldehyde resin, Graphite, Expanded graphite, tT100oc parameter, Mechanical properties | ||
| مراجع | ||
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