- Turkish Journal of Forest Science
- Cilt: 8 Sayı: 1 Güncel Sayı
- WOOD SANDWICH PANEL CORE MATERIALS: RIGID POLYURETHANE (PU) COMPOSITES FILLED WITH ORGANIC AND INORG...
WOOD SANDWICH PANEL CORE MATERIALS: RIGID POLYURETHANE (PU) COMPOSITES FILLED WITH ORGANIC AND INORGANIC PARTICLES
Authors : Süheyla Esin Köksal, Orhan Kelleci
Pages : 18-31
View : 48 | Download : 50
Publication Date : 2024-04-30
Article Type : Research
Abstract :In this study, polyurethane (PU) foam composite was produced by adding wheat flour (WF), satin surface finishing plaster (AL) and urea formaldehyde (UF) into polyurethane wood glue. In this study, it is aimed to produce water resistant, high screw holding force and light weight and rigid PU foam composite that can be used in the core layer of wooden sandwich panels. For this purpose, the fillers were added to the PU in certain proportions and the samples were foamed by mechanical mixing. The foaming time lasted approximately 30 minutes. The foam volume was brought to its initial level by mixing the foam in the first 15 minutes. Foaming continued in the next 15 minutes. Samples were kept in water for 2 hours and 24 hours and their thickness swelling (TS) and water absorption (WA) amounts were analyzed according to the relevant standards. In addition, the mechanical characterization of the samples was carried out by analyzing the screw withdrawal strength (SR) according to the relevant standard. According to the results obtained, it was determined that the addition of WF increased the densities, water absorption and swelling of the samples. This is a negative event. However, this increase did not exceed the particleboard standard limits. On the other hand, the addition of WF increased the SR forces of the samples. The addition of UF did not make a significant change in the SR strength when used with the addition of WF. However, UF significantly reduced the SR strength when used with AL. As a result, PU foams can be given a more rigid structure by using various fillers. In this way, the screw holding resistance can be increased and it can be used in the core layers of wooden sandwich panels. Thus, it indirectly contributes to the protection of forest resources.Keywords : Ahşap sandviç panel, vida çekme, çekirdek katman, poliüretan, köpükler