In this study polyurethane (PU) residues were mixed with residues of textile fibers (cotton, wool and synthetic fibers up to 70 wt/wt) to produce 100% recycled composites. In addition, the effect of the type of fiber on the performance of the ensuing composites was evaluated. The presence of fibers showed similar effect on the density, reducing the density in the 5.5-9.0% range. In a similar manner, the addition of fillers decreased their thermal conductivity. The 70 wt/wt wool composite presented 38.1% lower thermal conductivity when compared to the neat matrix, a reduction that was similar for the other type of fibers. Moreover, the presence of fillers yields stiffer materials, especially in the case of the Wool based composites, which with 70 wt/wt of filler content increased the tensile modulus of the ensuing material 3.4 times. This was attributed to the aspect ratio and stiffness of this type of fiber. Finally, the high-water absorption and lower thermal stability observed, especially in the case of the natural fibers, was associated with the hydrophilic nature of fibers and porosity of composites. Overall, the results suggest that these textile-based composites are suitable for construction and automotive applications, with the advantage of being produced from 100% recycled raw-materials, without compromised performance.

在这项研究中，聚氨酯 (PU) 残留物与纺织纤维残留物（棉花、羊毛和合成纤维，最高 70 wt/wt）混合，以生产 100% 回收复合材料。此外，评估了纤维类型对后续复合材料性能的影响。纤维的存在对密度显示出类似的影响，将密度降低 5.5-9.0%。以类似的方式，添加填料降低了它们的热导率。与纯基质相比，70 wt/wt 羊毛复合材料的热导率降低了 38.1%，这与其他类型的纤维相似。此外，填料的存在会产生更硬的材料，特别是在基于羊毛的复合材料的情况下，当填料含量为 70 wt/wt 时，随后材料的拉伸模量增加了 3.4 倍。这归因于此类纤维的纵横比和刚度。最后，观察到的高吸水率和较低的热稳定性，特别是在天然纤维的情况下，与纤维的亲水性和复合材料的孔隙率有关。总体而言，结果表明这些基于纺织品的复合材料适用于建筑和汽车应用，其优势是由 100% 回收原材料生产，而不会影响性能。