| 초록 |
Lacquer sap is a excellent natural coating materials. However, it has two drawbacks that make it difficult to be easily applied in the industry. The drawbacks are the very long drying times and discoloration to dark brown. In order to improve the peculiar characteristics of lacquer sap, we proposed the W/O nano-emulsification using ultrasonic waves. Due to the cavitation effect generated by the ultrasonic waves, the W/O emulsion micelles of lacquer sap were crushed to nano-sized, and smaller by higher amplitude. Also, the lacquer thin film prepared with higher amplitude was dried faster and the transmittance was more improved at the same ultrasonication time. It seems that the crosslinking of urushiol was more activated by smaller emulsion micelles through ultrasonication with higher amplitude. Nano-emulsification using ultrasonic waves is expected to simply and effectively control and improve the drying property and transmittance of lacquer thin film. |
