Effect of the nano-titanium dioxide (nano-TiO₂) coating on the photoaging properties of thermally treated bamboo

ABSTRACT

Moso bamboo was firstly treated in a vacuum chamber at 150°C, 170°C, 190°C, and 210°C for 1, 2, and 3 h, respectively. Nano-TiO₂ gel were then coated on the surface of thermally treated (TM) bamboo. Finally, specimens were radiated by an accelerated aging chamber of xenon lamp for 144 h. Chroma Meter, Scanning electron microscopy and Energy-dispersive spectroscopy (SEM-EDS) were applied to investigate the effect of nano-TiO₂ coating on the surface color stability of TM bamboo. Results revealed that TM imposed a significant effect on the surface color of bamboo, e.g. when treatment temperature and duration increased, bamboo surface became darker. The color parameters of TM bamboo coated with nano-TiO₂ gel after aging were close to the bamboo before aging, indicating that the photo-discoloration resistance of the TM bamboo has been improved. The nano-TiO₂ gel with a concentration of 10% shows a better effect than that of 5%. After aging for 144 h, the ΔE of TM bamboo (190°C/2 h) coated by nano-TiO₂ gel with a concentration of 10% was 2.90, which decreases by 25% compared with that of uncoated bamboo. Furthermore, the nano-TiO₂ coating had no obvious aging failure after 144 h aging, which avoided the leaching of TiO₂ particles during the long-term service.

KEYWORDS:

• Moso bamboo
• thermally treatment
• coating
• nano-TiO₂
• photoaging properties

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the National Natural Science Foundation of China: [Grant Number 31901374]; Nanjing Forestry University Youth Science and Technology Innovation Foundation: [Grant Number CX2019004]; Nanjing Forestry University Scientific Research Start-up Foundation [Grant Number GXL2020003].