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- Title
اثر افزودن سمرافيت وسمرافيت اصلاحشده به حسبي اوره فرمآلدهيد بر خواص حرارتى)MDF(ومكانيكى تخته فيبر نيمه لتكين
- Authors
رضا جزايرى; سعيد كاظمى نجفى; حبيب اهلل يونسى
- Abstract
This study aimed at the application of unmodified (G) and modified graphite (EG) materials as a multifunction additive to 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. Both additives were individually added to the urea formaldehyde resin in three doses of 1, 2 and 3% (based on the dry weigth of UF resin) to make the MDF panels with 750 kg/m3 nominal density. During the pressing time, the tT0°c parameter (time to reach temperature100٥C) 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 highest 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. G and EG additives showed a higher degree of internal bonding compared to MnO2-EG additive. In this regard, EG2 and EG3 treatments showed 42% increase in internal bonding and G2 treatment showed 40% increase in internal bonding. The effect of EG2 treatment in improving TS24 was greater than other treatments, so that it caused a 19% decrease compared to the control.
- Subjects
MEDIUM density fiberboard; UREA-formaldehyde resins; MANGANESE dioxide; ELASTIC modulus; THERMOCOUPLES
- Publication
Iranian Journal of Wood & Paper Science Research, 2023, Vol 38, Issue 2, p100
- ISSN
1735-0913
- Publication type
Article
- DOI
10.22092/IJWPR.2023.354899.1687