Augaitis Nerijus, Vaitkus Saulius, Członka Sylwia, Kairytė Agnė
Laboratory of Thermal Insulating Materials and Acoustics, Institute of Building Materials, Faculty of Civil Engineering, Vilnius Gediminas Technical University, 10221 Vilnius, Lithuania.
Institute of Polymer and Dye Technology, Lodz University of Technology, 90-924 Lodz, Poland.
Materials (Basel). 2020 Nov 25;13(23):5336. doi: 10.3390/ma13235336.
Currently, the recycling potential of wood waste (WW) is still limited, and in a resource efficiency approach, recycling WW in insulation materials, such as polyurethane (PUR), appears as an appropriate solution. It is known that the quality of WW is the main aspect which influences the stability of the final products. Therefore, the current study analyses different WW-based fillers as possible modifiers for polyurethane biocomposite foams for the application as loose-fill materials in building envelopes. During the study of WW-based fillers, it was determined that the most promising filler is wood scobs (WS) with a thermal conductivity of 0.0496 W/m·K, short-term water absorption by partial immersion-12.5 kg/m, water vapour resistance-0.34 m·h·Pa/mg and water vapour diffusion resistance factor-2.4. In order to evaluate the WS performance as a filler in PUR biocomposite foams, different ratios of PUR binder and WS filler (PURb/WS) were selected. It was found that a 0.40 PURb/WS ratio is insufficient for the appropriate wetting of WS filler while a 0.70 PURb/WS ratio produced PUR biocomposite foams with the most suitable performance: thermal conductivity reduced from 0.0523 to 0.0476 W/m·K, water absorption-from 5.6 to 1.3 kg/m, while the compressive strength increased from 142 to 272 kPa and the tensile strength increased from 44 to 272 kPa.
目前，木材废料（WW）的回收潜力仍然有限，从资源效率的角度来看，将WW回收用于隔热材料，如聚氨酯（PUR），似乎是一个合适的解决方案。众所周知，WW的质量是影响最终产品稳定性的主要因素。因此，本研究分析了不同的基于WW的填料，作为聚氨酯生物复合泡沫的可能改性剂，用于建筑围护结构中的松散填充材料。在对基于WW的填料的研究中，确定最有前景的填料是木刨花（WS），其导热系数为0.0496W/m·K，部分浸入法短期吸水率为12.5kg/m，水蒸气阻力为0.34m·h·Pa/mg，水蒸气扩散阻力因子为2.4。为了评估WS作为PUR生物复合泡沫填料的性能，选择了不同比例的PUR粘合剂和WS填料（PURb/WS）。结果发现，0.40的PURb/WS比例不足以使WS填料充分润湿，而0.70的PURb/WS比例产生的PUR生物复合泡沫具有最合适的性能：导热系数从0.0523降至0.0476W/m·K，吸水率从5.6降至1.3kg/m，抗压强度从142kPa增加到272kPa，抗拉强度从44kPa增加到272kPa。
