Abstract
The aim of the present work was to develop an innovative and environmentally friendly process for wood fiber dyeing and to produce 3-dimensionally fully colored medium-density fiberboard (MDF). The potential of laccase-catalyzed polymerization of selected precursors to form dyes useful in fiberboard manufacturing, a technique used for the first time in this field, was demonstrated. Some of the 7 aromatic compounds tested yielded colored products after laccase treatment under both acid and alkaline conditions, and a good variety of colors was attained by using mixtures of two different monomers. To demonstrate the coloration and design potential of laccase conversion of aromatic compounds, MDFs were enzymatically dyed using an in situ one-step laccase-catalyzed coloration process, and the results were compared against commercial MDFs obtained by using organic coloring agents. Important advantages over conventional processing methods include good color fastness and, in some cases, new hydrophobic properties, allowing designers and woodworkers to explore the beauty of textures and the use of simpler and milder processing conditions that eliminate harsh chemical use and reduce energy consumption.
Highlights
In the frame of circular economy, wood wastes are becoming increasingly attractive to meet the enormous demand of wood that exists in a wide range of industries (Euring et al, 2011)
The aim of this research was to develop a laccase-catalyzed in situ dyeing process for wood fibers that could be integrated into the already existing industrial processes, as an alternative to conventional medium-density fiberboard (MDF) dyeing methods
The ability of POXA1b laccase to catalyze dye formation when incubated with seven commercially available compounds was first assayed in aqueous solution in both acidic and alkaline environments
Summary
In the frame of circular economy, wood wastes are becoming increasingly attractive to meet the enormous demand of wood that exists in a wide range of industries (Euring et al, 2011). Wood chips and sawdust are produced, in addition to thinning and residual wood. These residues can be used as raw material for furniture and interior design in the production of wood-based devices, such as wood medium-density fiberboard (MDF). Wood fibers are generally blended with resin, wax, and other additives; dried; and pressed. The boards are cooled, sanded, trimmed, and sawed to final dimensions. MDFs may be painted or laminated; the coloring procedure generally covers only the small part of wood fibers visible on the surface
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