Dukarska Dorota, Walkiewicz Joanna, Derkowski Adam, Mirski Radosław
Department of Mechanical Wood Technology, Faculty of Forestry and Wood Technology, Poznań University of Life Sciences, Wojska Polskiego 38/42, 60-627 Poznań, Poland.
Materials (Basel). 2022 Aug 4;15(15):5361. doi: 10.3390/ma15155361.
In this study, the possibility of using sawdust, a by-product of primary wood processing, as a filler (WF) for rigid polyurethane (PUR) foams was investigated. The effects of the addition of 5, 10, 15 and 20% of WF particles to the polyurethane matrix on the foaming process, cell structure and selected physical-mechanical properties such as density, thermal conductivity, dimensional stability, water absorption, brittleness, compressive and bending strengths were evaluated. Based on the results, it was found that the addition of WF in the amount of up to 10% does not significantly affect the kinetics of the foam foaming process, allowing the reduction of their thermal conductivity, significantly reducing brittleness and maintaining high dimensional stability. On the other hand, such an amount of WF causes a slight decrease in the compressive strength of the foam, a decrease in its bending strength and an increase in water absorption. However, it is important that in spite of the observed decrease in the values of these parameters, the obtained results are satisfactory and consistent with the parameters of insulation materials based on rigid PUR foam, currently available on the market.
在本研究中，对将初级木材加工的副产品锯末用作硬质聚氨酯（PUR）泡沫塑料的填料（WF）的可能性进行了研究。评估了向聚氨酯基体中添加5%、10%、15%和20%的WF颗粒对发泡过程、泡孔结构以及选定的物理机械性能（如密度、热导率、尺寸稳定性、吸水性、脆性、抗压强度和抗弯强度）的影响。基于这些结果发现，添加量高达10%的WF不会显著影响泡沫发泡过程的动力学，能够降低其热导率，显著降低脆性并保持高尺寸稳定性。另一方面，这样数量的WF会导致泡沫的抗压强度略有下降、抗弯强度降低以及吸水性增加。然而，重要的是，尽管观察到这些参数值有所下降，但所得结果令人满意，并且与目前市场上基于硬质PUR泡沫的保温材料参数一致。
