Abstract:

The preparation of nano-Al₂O₃ slurry and modified waterborne wood coating with nano-Al₂O₃ slurry were studied in this paper to improve the wearing resistance and hardness of the polyacrylate coating on the surface of wood. The effects of the preparative technique and the contents of nano-Al₂O₃ on wearing resistance and hardness were discussed. The results showed that nano-Al₂O₃ slurry, which was prepared with polyacrylamide, polyglycol, polyoxyethylene octyl phenyl ether and protective colloid by bead mill and ultrasonic device, stored stably and was suitable for the system of waterborne coating. The slurry had good dispensability and Al₂O₃ kept in nano size observed by TEM. The films have good wearing resistance and hardness when Al₂O₃ content reach 1.5% without change the transparence by additive. The wearing resistance and hardness of the hybrid films were better than that of the films mixed with nano additive.

Key words: nano-Al₂O₃, waterborne wood coating, slurry, wearing resistance, hardness of film