Abstract
Ecofriendly wood-based materials are required by consumers at present. Decorative panels are part of a large group of wood-composite materials, and their environmental properties must not be neglected. More environmentally friendly decorative panels can be achieved by various methods. This paper describes a method of production from larch bark. Tree bark, as a byproduct of the wood industry, is one of the research topics that have gained interest in the last decade, especially for its applications in biobased lignocomposites, with regard to the shrinkage of wood resources. In the present work, the formaldehyde content of decorative boards based on larch bark (0.6 g/cm3) was analyzed when bonded with five different types of adhesive systems: urea-formaldehyde, polyvinyl acetate, the mixture of 70% urea-formaldehyde + 30% polyvinyl acetate, polyurethane, and tannin-based adhesive. A self-agglomerated board was also analyzed. The formaldehyde content of the larch-bark samples was determined with the perforator method (EN 120:2011), and findings showed that all tested samples reached the E1 classification (≤8 mg/100 oven dry). Moreover, 75% of the values of the corrected formaldehyde content were included in the super-E0 class (≤1.5 mg/100 oven dry). In the case of boards bonded with tannin-based adhesive, this natural polymer acted as a formaldehyde scavenger.
Highlights
In the last decade, approaches regarding healthy environments and welfare have had increasing attention from both society and the authorities, pointing out that quality of life is reflected in the building sector [1]
The aim of this study was to find to what extent larch bark acts as a formaldehyde scavenger in the case of 10 mm decorative larch-bark panels bonded with UF, polyvinyl acetate (PVAc), a mixture of 70% UF + 30% PVAc, polyurethane (PUR), tannin-based adhesive, and self-agglomeration
The lowest amounts were measured for the board with a fine
Summary
Approaches regarding healthy environments and welfare have had increasing attention from both society and the authorities, pointing out that quality of life is reflected in the building sector [1]. Recent urban development entails safeguarding ecological integrity with the low carbon footprints of construction materials [2]. Nowadays, both employed and unemployed persons spend about 75% of their existence indoors, e.g., at home, in workplaces, schools, and other institutions [3], and sick building syndrome (SBS) has become a severe global problem [1,4,5]. Many materials can absorb formaldehyde released into the atmosphere, e.g., wool [6], ornamental plants [7,8], building materials with adsorption potentials [9], or tree bark [5,10]. The bark percentage varies depending on tree species, age, and diameter [12]
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