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Paper Information

Journal:   IRANIAN JOURNAL OF WOOD AND PAPER SCIENCE RESEARCH   winter 2019 , Volume 33 , Number 4 (65) ; Page(s) 511 To 521.

Investigation on the effect of wood moisture on tensile bonding strength of polyester and polyurethane clear paints on wood surface

Author(s):  FAZELI A., GHOFRANI M., Hassani Khorshidi f.*
* Wood Science and Technology Department, Faculty of Materials Engineering and New Technologies, Shahid Rajaee Teacher Training University, Tehran, Iran
The present study was conducted to investigate the effect of wood moisture content on adhesion strength of half-polyester and polyurethane sealers on beech (Fagus orientalis) and hornbeam (Carpinus betulus) wood surface. PH values of beech and hornbeam woods were measured as 5. 51 and 5. 19, respectively. Dried specimens were placed in a constant climate chamber to reach moisture contents of 7%, 11% and 15%. After the preparation stage, two layers of sealer were placed on the specimens using a spray gun. Next, polyurethane and half-polyester were applied to the specimens. The pull-off test was performed on the specimens according to the ASTM D 4541 Standard. The results showed that the most of adhesion strength was due to the polyurethane sealer used on the beech wood with the moisture content of 7 percent and the least adhesion strength belonged to the half-polyester sealer applied on the hornbeam wood type with the moisture content of 15 percent. It was also observed that increasing moisture content caused a decrease in adhesion strength of both wood types.
Keyword(s): Adhesion strength,clear paints,sealer,half-polyester,polyurethane
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