Delamination Rate of Acrylic-Latex-Finished Urea-Bonded Particleboard in Short-Term Exterior Exposure

摘要

Certain oil-based exterior finishes have been shown to protect urea-bonded particleboard for up to 8 years of exterior exposure. The work reported here was undertaken to determine if other currently used exterior finish systems, most notably those using acrylic-latex finishes, could likewise protect urea-bonded particleboard from early delamination. Four paint-finishing systems and two stain-finishing systems were evaluated. Finished panels varied in time to board failure, but none of the finishing systems completely prevented panel delamination and excessive thickness swelling in 3 years of exterior exposure in Madison, WI. Furthermore, all-latex finishing systems (paint systems using latex primer as well as topcoat and a latex stain system) usually resulted in excessive thickness swelling and delamination by 15 months of exposure.