Forest Products Technology and Timber Construction Department, Salzburg University of Applied Sciences, Markt 136a, 5431 Kuchl, Austria.
Faculty of Wood Engineering, Transilvania University of Brasov, Bld. Eroilor nr.29, 500036 Brasov, Romania.
Int J Environ Res Public Health. 2020 Jan 25;17(3):764. doi: 10.3390/ijerph17030764.
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.
目前消费者需要环保型木质材料。装饰板是一大类木基复合材料的一部分，其环境性能不容忽视。通过各种方法可以实现更环保的装饰板。本文介绍了一种从落叶松树皮中生产的方法。树皮作为木材工业的副产品，是过去十年中引起关注的研究课题之一，特别是在生物基木质复合材料方面，因为这涉及到木材资源的收缩。在本工作中，分析了五种不同类型的胶粘剂系统（脲醛树脂、聚醋酸乙烯酯、70%脲醛树脂+30%聚醋酸乙烯酯混合物、聚氨酯和单宁基胶粘剂）粘结的基于落叶松树皮的装饰板的甲醛含量：脲醛树脂、聚醋酸乙烯酯、70%脲醛树脂+30%聚醋酸乙烯酯混合物、聚氨酯和单宁基胶粘剂。还分析了自团聚板。用穿孔器法（EN 120:2011）测定落叶松树皮样品的甲醛含量，结果表明，所有测试样品均达到 E1 级（≤8mg/100 干基）。此外，75%的修正甲醛含量值包含在超级 E0 级（≤1.5mg/100 干基）内。在使用单宁基胶粘剂粘结的板材中，这种天然聚合物充当了甲醛清除剂。
