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تاثیر گرافیت اصلاحشده در انتشار فرمالدهید از تخته فیبر نیمه سنگین (MDF) | ||
| تحقیقات علوم چوب و کاغذ ایران | ||
| مقاله 4، دوره 35، شماره 4 - شماره پیاپی 73، دی 1399، صفحه 348-361 اصل مقاله (698.25 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/ijwpr.2020.343601.1624 | ||
| نویسندگان | ||
| رضا جزایری1؛ سعید کاظمی نجفی* 1؛ حبیب الله یونسی2؛ ابوالفضل کارگرفرد3 | ||
| 1گروه علوم و صنایع چوب و کاغذ، دانشگاه تربیت مدرس، نور، ایران | ||
| 2گروه محیط زیست دانشکده منابع طبیعی و علوم دریایی دانشگاه تربیت مدرس نور ایران | ||
| 3عضو هیئت علمی بخش تحقیقات علوم چوب و فرآوردههای آن، مؤسسه تحقیقات جنگلها و مراتع کشور، تهران | ||
| چکیده | ||
| در این تحقیق اثر گرافیت و دو ماده گرافیتی اصلاحشده در کاهش انتشار فرمآلدهید تخته فیبر نیمهسنگین (MDF) مورد بررسی قرار گرفت. بدین منظور گرافیت انبساطیافته (EG) از گرافیت (G) و گرافیت انبساطیافته اصلاحشده (MnO2-EG) از طریق فرآیند اینترکالیشن گرافیت انبساطیافته با دی اکسید منگنز تولید گردیدند. آزمونهای تعیین ویژگیهای ملکولی شامل تفرق اشعه X (XRD) و طیفسنجی پراش انرژی پرتو X (SEM-EDS) در خصوص مواد گرافیتی تولیدشده انجام شد. ضمنا آزمون کالریمتری روبشی تفاضلی(DSC) برای ارزیابی رفتار حرارتی رزین تحت تاثیر مواد گرافیتی صورت پذیرفت. مواد موصوف به عنوان افزودنی در سه مقدار مصرف 1، 2 و 3 درصد وزنی(وزن خشک رزین) به رزین اوره فرمآلدهید افزوده و سپس از الیاف چسبخورده، تخته فیبر نیمهسنگین (MDF) با دانسیته اسمیkg/m3 750 ساخته شد. پس از ساخت تخته، آزمون انتشار فرمآلدهید روی نمونههای آزمون به روش دسیکاتور انجام شد. در مجموع MnO2-EG در مقایسه با شاهد و دو تیمار گرافیتی دیگر نتایج بهتری را نشان داد به طوری که در مقدار مصرف 3 درصد ،انتشار فرمآلدهید را حدود 61 درصد کاهش داد. به نظر می رسد ملکولهای فرمآلدهید جذبشده به لایههای گرافیتی انبساطیافته در معرض اکسیداسیون توسط ملکولهای دیاکسید منگنز قرار گرفتند. از طرف دیگر همانگونه که آزمون DSC نشان داد بالاترین میزان آنتالپی واکنش در رزین حاوی MnO2-EG پدید آمد که نمایانگر افزایش واکنش ملکولهای فرمآلدهید در ساختار رزین بوده است. | ||
| کلیدواژهها | ||
| رزینUF؛ گرافیت انبساط یافته؛ دی اکسید منگنز؛ انتشار فرمالدهید | ||
| عنوان مقاله [English] | ||
| Influence of modified graphite on formaldehyde emission from medium density fiberboard ( MDF) | ||
| نویسندگان [English] | ||
| Reza Jazayeri1؛ saeed kazemi najafi1؛ Habibollah Younesi2؛ Abolfazl Kargarfard3 | ||
| 1Wood science and technology department, Tarbiat modares university, Noor, Iran | ||
| 2Environment department natural resources faculty Tarbiat modares university noor Iran | ||
| 3Wood and Forest Products Science Research Division, Research Institute of Forests and Rangelands, Tehran, Iran, | ||
| چکیده [English] | ||
| In this study, the effect of graphite and two modified graphite materials in reducing formaldehyde emission of medium density fiberboard (MDF) was investigated. For this purpose, expanded graphite (EG) was syntesyzed from graphite (G) and modified expanded graphite (MnO2-EG) was produced through the intercalation process of expanded graphite with manganese dioxide. Thus, three graphite materials were prepared for resin treatment. Molecular tests including X-ray diffraction (XRD) and X-ray diffraction spectroscopy (SEM-EDS) were performed to determine their molecular properties,. In addition, the differential scanning caliber test (DSC) test was performed to evaluate the thermal behavior of the resin under the influence of these graphite materials as additive. The additives were added to urea formaldehyde resin at three levels of consumption of 1, 2 and 3%, and then medium density fiberboard (MDF) with a density of 750 kg/m3 was made from glued fibers. After making the board, the formaldehyde emission test was performed by desiccator method. Overall, MnO2-EG showed better results than control and two other graphite treatments. The best performance was resulted by MnO2-EG at level 3% so that reduced formaldehyde emission by about 61%. It seams the formaldehyde molecules absorbed into the expanded graphite layers were exposed to oxidation by manganese dioxide molecules. On the other hand, as the DSC test showed, the highest anthalopy reaction occurred in resin treated by MnO2-EG, indicating an increase in the reaction of formaldehyde molecules in the resin structure. | ||
| کلیدواژهها [English] | ||
| UF resin, expanded graphite, manganese dioxide, formaldehyde emission | ||
| مراجع | ||
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