Drvna industrija, Vol. 69 No. 3, 2018.
Izvorni znanstveni članak
https://doi.org/10.5552/drind.2018.1726
Supplementation of Natural Tannins as an Alternative to Formaldehyde in Urea and Melamine Formaldehyde Resins used in MDF Production
Sima Sepahvand
; Odjel za znanost i tehnologiju drva i papira, Fakultet prirodnih resursa, Sveučilište u Teheranu, Teheran, Iran
Kazem Doosthosseini
; Odjel za znanost i tehnologiju drva i papira, Fakultet prirodnih resursa, Sveučilište u Teheranu, Teheran, Iran
Hamidreza Pirayesh
; Odjel za znanost i tehnologiju drva, Građevinski fakultet, Učiteljsko sveučilište Shahid Rajaee (SRTTU), Teheran, Iran
Behrooz Karamdoost Maryan
; Shafarood institucije za istraživanje i upravljanje šumama, Gilan, Iran
Sažetak
The aim of this study was to evaluate some mechanical and physical properties of medium density fiberboards (MDF) made from different adhesive types. Five panel types were made from mixtures of tannin (T) to urea formaldehyde (UF) and tannin to melamine formaldehyde (MF), TUF10%, TUF20%, MF, TMF10% and TMF20%, respectively. Besides, the effect of press temperatures (170 and 180 °C) on the curing of the formulations was studied. Some mechanical properties (modulus of rupture, modulus of elasticity and internal bond strength), physical properties (thickness swelling and water absorption) and formaldehyde emission of the resulting panels were determined. The incorporation of tannin decreases the formaldehyde emission of the panels. However, flexural properties and internal bond strength decreased with increasing tannin ratio. The results indicated that panels can be manufactured using tannin up to 10 % in UF resin without falling below the minimum EN Standard requirements of mechanical properties for general purpose MDF panels.
Ključne riječi
Tannin; MF; UF; Formaldehyde emission; MDF
Hrčak ID:
206350
URI
Datum izdavanja:
4.10.2018.
Posjeta: 1.749 *