Gabriela Maksymiuk, Aleksandra Jeżo, Jānis Rižikovs
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引用次数: 0
Abstract
As awareness grows regarding the necessity for sustainable technologies across various industries, including wood-based composites, there’s a heightened demand for ecological solutions. One of the proposed solutions is the partial replacement of wood raw materials in composites with forestry and agricultural waste, thus contributing to the circular economy. Suberin, which is a natural polyester present in tree bark, after depolymerization can be converted into suberinic acids, and after this process, post-extraction solid residues (SAR suberinic acid residues) remain, which include suberin monomers, lignin, cellulose and esters. In this study, it was decided to use this waste in the form of a powder with dimensions of 0.250 mesh as a filler for particleboards. Three-layer boards were prepared in four variants of SAR share in all layers (0%, 5%, 10%, 15%). The physical and mechanical properties of the manufactured boards were tested—modulus of rupture, modulus of elasticity, internal bond strength, screw withdrawal resistance, thickness swelling, water absorption, density profile, contact angle. The formaldehyde and total volatile compounds emissions of the boards were also determined. As a result of the research, it was shown that the addition of SAR has a positive effect on the properties of the panels, but only up to the level of 10%, whereas for boards with a SAR content of 15%, a statistically significant decrease in mechanical and physical properties was noted. The values obtained, however, were still within the required assumptions of the European Standards. Only the IB value obtained for the SAR 15% variant did not meet the requirements of the EU Standards. As shown, SAR addition significantly minimizes the emissions from boards, however, it decreases also the hydrophobicity. This study shows a great potential in applying post-extraction residues from bark as a filler material for wood-based panels.
随着各行各业(包括人造复合材料)对可持续发展技术必要性的认识不断提高,对生态解决方案的需求也在不断增加。建议的解决方案之一是用林业和农业废弃物部分替代复合材料中的木材原料,从而为循环经济做出贡献。树胶是一种存在于树皮中的天然聚酯,在解聚后可转化为树胶酸,在此过程中会残留提取后的固体残留物(SAR 树胶酸残留物),其中包括树胶单体、木质素、纤维素和酯类。在这项研究中,我们决定以 0.250 目的粉末形式使用这些废料,作为刨花板的填料。三层板的制备采用了四种不同的 SAR 比例(0%、5%、10%、15%)。测试了所制板材的物理和机械性能--断裂模数、弹性模量、内部粘合强度、螺钉抽出阻力、厚度膨胀、吸水率、密度曲线、接触角。此外,还测定了木板的甲醛和总挥发性化合物排放量。研究结果表明,添加 SAR 对板材的性能有积极影响,但最多只能达到 10%的水平,而对于 SAR 含量为 15%的板材,机械和物理性能在统计上有显著下降。不过,所获得的数值仍然符合欧洲标准的要求。只有 SAR 含量为 15% 的变体的 IB 值不符合欧盟标准的要求。如图所示,添加 SAR 能显著减少木板的排放,但同时也会降低疏水性。这项研究表明,将树皮提取后残留物用作人造板的填充材料具有很大的潜力。
期刊介绍:
European Journal of Wood and Wood Products reports on original research and new developments in the field of wood and wood products and their biological, chemical, physical as well as mechanical and technological properties, processes and uses. Subjects range from roundwood to wood based products, composite materials and structural applications, with related jointing techniques. Moreover, it deals with wood as a chemical raw material, source of energy as well as with inter-disciplinary aspects of environmental assessment and international markets.
European Journal of Wood and Wood Products aims at promoting international scientific communication and transfer of new technologies from research into practice.