Amundarain Izotz, Miguel-Fernández Rafael, Asueta Asier, García-Fernández Sara, Arnaiz Sixto
GAIKER Technology Centre, Basque Research and Technology Alliance (BRTA), Parque Tecnológico de Bizkaia, Edificio 202, 48170 Zamudio, Spain.
Polymers (Basel). 2022 Mar 14;14(6):1157. doi: 10.3390/polym14061157.
The preparation and characteristics of rigid polyurethane foams (RPUFs) synthesized from polyols obtained by glycolysis of post-industrial waste RPUFs have been studied. More precisely, waste rigid foams that have been chemically recycled by glycolysis in this work are industrially produced pieces for housing and bracket applications. The glycolysis products have been purified by vacuum distillation. The physicochemical properties of the polyols, such as hydroxyl value, acid value, average molecular weight (M) and viscosity have been analyzed. The chemical structure and thermal stability of the polyols have been studied by means of FTIR and TGA, respectively. Partial substitution of the commercial polyol (up to 15 wt.%) by the recycled polyols increases the reactivity of the RPUFs synthesis, according to short characteristic times during the foaming process along with more exothermic temperature profiles. Foams formulated with recycled polyols have a lower bulk density (88.3-96.9 kg m) and smaller cell sizes compared to a conventional reference RPUF. The addition of recycled polyols (up to 10 wt.%) into the formulation causes a slight decrease in compressive properties, whereas tensile strength and modulus values increase remarkably.
对通过工业后废弃硬质聚氨酯泡沫塑料（RPUFs）糖酵解得到的多元醇合成的硬质聚氨酯泡沫塑料（RPUFs）的制备及其特性进行了研究。更确切地说，在本工作中通过糖酵解进行化学回收的废弃硬质泡沫塑料是用于房屋和支架应用的工业生产部件。糖酵解产物已通过真空蒸馏进行了纯化。分析了多元醇的物理化学性质，如羟值、酸值、平均分子量（M）和粘度。分别通过傅里叶变换红外光谱（FTIR）和热重分析（TGA）研究了多元醇的化学结构和热稳定性。根据发泡过程中较短的特征时间以及更放热的温度曲线，用回收多元醇部分替代商业多元醇（最高15 wt.%）可提高RPUFs合成的反应活性。与传统参考RPUF相比，用回收多元醇配制的泡沫塑料具有更低的堆积密度（88.3 - 96.9 kg/m³）和更小的泡孔尺寸。在配方中添加回收多元醇（最高10 wt.%）会导致压缩性能略有下降，而拉伸强度和模量值则显著增加。
