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Paper Information

Journal:   IRANIAN JOURNAL OF WOOD AND PAPER SCIENCE RESEARCH   FALL 2017 , Volume 32 , Number 3 (60) ; Page(s) 322 To 333.

Improvement of adhesion strength of polyurethane and alkyd coatings using sol-gel method nano-silane wood surface modification

* Department of Wood and Paper Science & Technology, Faculty of Natural Resources, University of Tehran, Karaj, Iran
In present study, the improvement of adhesion strength of polyurethane and alkyd coatings on the poplar wood (Populus nigra) by nano-silane coating using sol-gel method for outdoor application is investigated. For this purpose, the boards with the dimensions of 15 × 10 × 2 mm were prepared according to EN 927-5. The surfaces of wood specimens were modified with Tetraethoxysilane (T) sol-gel material and then, solvent-borne alkyd (AS) and solvent-borne polyurethane (PS) coatings were applied. The coated samples were placed outdoor on a platform facing south and with a slope of 36 for 8 months according to ISO 877 standard. In order to characterize the quality of the coatings, colorimetric, tensile adhesion (Pull off), scratch adhesion (Cross cut) and ATR-FTIR tests were performed before and after weathering. The ATR-FTIR analysis demonstrated that the wood surface was covered with silicon oxides (SiO2) attached to hydrocarbon chains. As a result of wood surface modification by sol-gel, the color and adhesion strength of polyurethane and alkyd coatings were less affected by weathering. The highest tensile and scratch adhesions were found for the combined sol-gel and polyurethane coatings.
Keyword(s): Sol-gel,alkyd and polyurethane coating,adhesion,weathering
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