P-11　Acetylation of wood powder (Japanese cedar) with mechanochemical grinding using the vibration mill with ring media

Abstract

In this study, we attempted a simultaneous pulverization and acetylation of wood powder (Japanese cedar) by mechanochemical grinding using a vibration mill with ring media. Acetic anhydride was used as the acetylation reagent to be added during pulverization, and the input ratio of acetic anhydride was set to 50, 75, and 100% for 200 g wood powder. For the evaluation, the particle size distribution, and the degree of acetylation by the weight increase rate (WPG) were measured and powder state was observed by a scanning electronic microscope to confirm the effect of the pulverization time. As a result, the highest WPG of 17.5% was obtained in 60 min pulverization in which the acetylation reagent was 75%. On the other hand, although the decrease in powder particle size was suppressed by increasing the amount of acetylation reagent added, the effect of suppressing wood powder agglutination was also confirmed.