Kairytė Agnė, Członka Sylwia, Boris Renata, Vėjelis Sigitas
Laboratory of Thermal Insulating Materials and Acoustics, Institute of Building Materials, Faculty of Civil Engineering, Vilnius Gediminas Technical University, Linkmenu st. 28, LT-08217 Vilnius, Lithuania.
Institute of Polymer & Dye Technology, Lodz University of Technology, 90-924 Lodz, Poland.
Materials (Basel). 2021 Sep 16;14(18):5351. doi: 10.3390/ma14185351.
The study analyses rigid polyurethane (PUR) foam modified with 10-30 wt.% sunflower press cake (SFP) and liquid glass-impregnated sunflower press cake (LG-SFP) particles and their impact on performance characteristics of PUR foams-foaming behaviour, rheology, thermal conductivity, compressive strength parallel and perpendicular to the foaming directions, tensile strength, dimensional stability, short-term water absorption by partial immersion, and thermal stability. Even though the dynamic viscosity and apparent density were increased for SFP and LG-SFP formulations, thermal conductivity values improved by 17% and 10%, respectively, when 30 wt.% of particles were incorporated. The addition of SFP and LG-SFP particles resulted in the formation of more structurally and dimensionally stable PUR foams with a smaller average cell size and a greater content of closed cells. At 30 wt.% of SFP and LG-SFP particles, compressive strength increased by 114% and 46% in the perpendicular direction, respectively, and by 71% and 67% in the parallel direction, respectively, while tensile strength showed an 89% and 85% higher performance at 30 wt.% SFP and LG-SFP particles loading. Furthermore, short-term water absorption for all SFP and LG-SFP modified PUR foam formulations was almost two times lower compared to the control foam. SFP particles reduced the thermal stability of modified PUR foams, but LG-SFP particles shifted the thermal decomposition temperatures towards higher ones.
该研究分析了用10-30重量%的向日葵压榨饼（SFP）和液体玻璃浸渍的向日葵压榨饼（LG-SFP）颗粒改性的硬质聚氨酯（PUR）泡沫及其对PUR泡沫性能特性的影响——发泡行为、流变学、热导率、与发泡方向平行和垂直方向的抗压强度、拉伸强度、尺寸稳定性、部分浸没的短期吸水率以及热稳定性。尽管SFP和LG-SFP配方的动态粘度和表观密度有所增加，但当加入30重量%的颗粒时，热导率值分别提高了17%和10%。SFP和LG-SFP颗粒的加入导致形成了结构和尺寸更稳定的PUR泡沫，平均泡孔尺寸更小，闭孔含量更高。在30重量%的SFP和LG-SFP颗粒含量下，垂直方向的抗压强度分别提高了114%和46%，平行方向分别提高了71%和67%，而在30重量%的SFP和LG-SFP颗粒负载下，拉伸强度分别提高了89%和85%。此外，所有SFP和LG-SFP改性PUR泡沫配方的短期吸水率几乎是对照泡沫的两倍。SFP颗粒降低了改性PUR泡沫的热稳定性，但LG-SFP颗粒将热分解温度提高到更高水平。
