Staining of wood veneers with anti-UV property using the natural dye extracted from Dalbergia cohinchinensis

In present study, a recyclable and environmentally friendly dyeing method through using extractives from Dalbergia cohinchinensis residues without any mordant as natural dye (ND) was studied with the objective of improving anti-UV property of the dyed wood. The dyeing mechanism was explored and the anti-UV property of ND dyed wood was evaluated. The results indicated that total color difference was negative correlate with 0/C ratio of dyed wood surface (R-2 = 0.9578). After UV irradiation treatment, the total color difference change, the color change rate and reflectance curves variation of ND dyed wood exhibited apparently lesser. Also, the color intensity of ND dyed wood decreased slighter (3.22%) compared to that of acid red dyed wood (40.39%) irradiated at shorter UV wavelength (313 nm). The dye coating spontaneously depositing on the surface of wood fiber imparted anti-UV property of ND dyed wood, which can be ascribed to reduction of photo-discoloration and mitigation of lignin degradation by ND layer absorbing and reflecting UV lights effectively. In addition, the staining method was shown to be a recyclable and eco-friendly scenario by SWOT analysis, which can be employed as potential alternatives of synthetic dyestuff in wood dyeing industry to meet cleaner production demand. (C) 2020 Elsevier Ltd. All rights reserved.

Automated summary

The study investigated the use of extractives from Dalbergia cohinchinensis residues as a natural dye to improve the anti-UV property of dyed wood. The results showed that the dyed wood exhibited lesser color difference and reduced color intensity after UV irradiation, indicating good anti-UV performance.