Study on hydration mechanism of low density magnesia-bonded wood wool panel.

摘要

Low density magnesia-bonded wood wool panel (MWWP) is an inorganic-bonded panel product in which wood excelsior is bonded with magnesia. The hydration reaction between magnesia (main content: MgO) and MgCl₂ directly influences the performance of the product, and is therefore the key factor to the improvement of MWWP quality. In this study, DSC, SEM, XRD and XPS analyses were applied to explore the mechanism of the hydration reaction. The results showed that the reaction products were more stable when the following parameters were chosen: magnesia-to-wood powder ratio was 100:25; the magnesia-to-MgCl₂ solution ratio was 100:90; the specific gravity of MgCl₂ solution was 1.26 and ferric alum and (NH₄) H₂PO₄ were chosen as additives. Prolonged reaction time also helped further the reaction and made the reaction product more stable. The optimum hydration temperature was 80 degrees C.