In this work, a castor-oil-based process for flexible polyurethane foam scrap decomposition was used to prepare a recycled-based polyurethane foam. Decomposed polyurethane (DP) and 4,4′ diphenylmethane diisocyanate (MDI) were polymerized at three distinct MDI/DP ratios (1.0/2.2, 1.0/2.7 and 1.0/3.2) and two curing times (15 and 50 min). The influence of castor oil on the decomposition process and subsequent synthesis of polyurethane foam were evaluated using Fourier transform infrared spectroscopy (FTIR). Further characterization of the final material was carried out through thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and mechanical testing. FTIR assessment showed the presence of multi-functional hydroxyl groups as a result of the decomposition process. TGA confirmed three thermal degradation zones between 160 ℃ and 535 ℃ indicating the degradation of non-reacted compounds as well as the presence of oligomers, fatty acid chains, and urethane network. Mechanical evaluation evidenced that the MDI/DP ratios had a significant effect on tensile properties. The addition of DP increased the elongation at break and reduced the tensile strength with a slight variation of curing time. From the perspective of pore size, SEM micrographs exhibited that cell size apparently decreased with the addition of the DP.

在这项工作中，使用了基于蓖麻油的柔性聚氨酯泡沫废料分解方法，以制备循环型聚氨酯泡沫。分解的聚氨酯（DP）和4,4'二苯基甲烷二异氰酸酯（MDI）以三种不同的MDI / DP比（1.0 / 2.2、1.0 / 2.7和1.0 / 3.2）和两次固化时间（15和50分钟）进行聚合。使用傅里叶变换红外光谱（FTIR）评估了蓖麻油对聚氨酯泡沫塑料分解过程和后续合成的影响。最终材料的进一步表征通过热重分析（TGA），扫描电子显微镜（SEM）和机械测试进行。FTIR评估表明，由于分解过程，存在多功能羟基。TGA证实了160℃至535℃之间的三个热降解区，表明未反应化合物的降解以及低聚物，脂肪酸链和氨基甲酸酯网络的存在。机械评估表明，MDI / DP比对拉伸性能有显着影响。DP的添加增加了断裂伸长率，并且降低了拉伸强度，并且固化时间略有变化。从孔径的角度来看，SEM显微照片显示，随着DP的加入，细胞尺寸明显减小。DP的添加增加了断裂伸长率，并且降低了拉伸强度，并且固化时间略有变化。从孔径的角度来看，SEM显微照片显示，随着DP的加入，细胞尺寸明显减小。DP的添加增加了断裂伸长率，并且降低了拉伸强度，并且固化时间略有变化。从孔径的角度来看，SEM显微照片显示，随着DP的加入，细胞尺寸明显减小。