PHOTODEGRADATION OF NATURAL WOOD VENEER AND STUDIES ON ITS COLOR STABILIZATION FOR AUTOMOTIVE INTERIOR MATERIALS

摘要

The aim of this study was to investigate the color and chemical changes of natural wood veneers after ultraviolet (UV) exposure for automotive interior materials. To control the photodegradation, chemical treatments with hydrogen peroxide (H_2O_2) and sodium hypo-chlorite (NaCIO) solution were applied to the veneer under different concentration conditions. The veneers treated with H_2O_2 showed strong color changes on the surface after the UV test. On the other hand, the veneers treated with NaCIO solution (2-3% concentration) showed excellent color stability compared to the untreated veneer because NaCIO partially removed lignin compounds on the veneer surface. NaCIO can improve the color stability by destroying the lignin structures. However, 3% NaCIO condition was seen to cause surface damage although this treatment condition had the best effect on photopro-tection. Therefore, treatment with 2% NaCIO was the best condition in this study for against color change and photodegradation caused by UV light.