Nanocellulose Modified Dye Solution and the Light Fastness Performance of Dyed Veneer
Three acidic dyes were treated with nanocellulose to obtain well-dispersed nano-modified dye solutions.The dye solutions'particle size dispersion,Zeta potential,and UV-visible light absorption performance were analyzed.The dyeing rate,light fastness,surface chemical structure,and microstructure of the dyed veneer were evaluated.The results showed that the dispersion uniformity and stability of the three dyes after nano modification were improved.After CNC-1%modification,the particle size of the dye significantly decreased,the uniformity of particle size distribution and the absolute value of Zeta potential improved,and the UV-visible light absorption intensity decreased.The dyeing rate of the dyed veneer was enhanced,and the light fastness reached level 4 of"Decorative veneered wood-based panel".The micro surface of the dyed veneer had fibrous aggregates formed by the combination of nanocellulose and dyes.Higher concentrations of CNC(CNC-4%)increase the adsorption capacity of dyes,leading to an increase in colloidal particles and aggregation,which in turn leads to larger particle size and the lower absolute value of Zeta potential,thereby affects the improvement of dye uptake and light fastness.
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