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Recycling and reuse of waste artificial turf via solid-state shear milling technology

机译：固态剪切铣削技术回收废弃人造草皮

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Nowadays, the amount of the artificial turf waste is very huge, as it has been applied widely. However, it is a great challenge to recycle and reuse waste artificial turf (WAT) because its components are complex and hard to separate. In this study, solid-state shear milling (S3M) technology was introduced to recycle WAT into composite powder with valuable properties through ultrafine milling of WAT at room temperature. The results showed that the WAT included 46.7 wt% PE, 8.7 wt% PP, 2.4 wt% PET, 16.1 wt% polyacrylate and 26.1 wt% inorganic infill. The results of SEM and ultra-depth three-dimensional (3D) microscopy indicated that the domain size of the recycled material became smaller with the increase of milling cycles. The domain size and the performance of the recycled material could be controlled by the particle size and the size distribution of the composite powder in the solid state. The dynamic mechanical analysis (DMA) and X-ray diffraction (XRD) patterns demonstrated that the S3M technology improved the compatibility between the components and effectively decreased the crystallite size of PE in WAT. The melt flow index and the high capillary rheology test indicated that the thermal processability of the recycling material became better through S3M milling. The tensile strength and the elongation at break of the recycling material reached 12.6 MPa and 96.3%, respectively. What's more, low-price wood–plastic products with good performance and appearance could be manufactured using the recycled materials.
机译：如今，人造草坪废料的数量非常庞大，已被广泛应用。但是，回收和再利用废弃的人造草皮（WAT）是一个巨大的挑战，因为其组件很复杂且难以分离。在这项研究中，引入了固态剪切研磨（S 3 M）技术，通过在室温下超细研磨WAT，将WAT回收成具有有价值特性的复合粉末。结果表明，WAT包括46.7重量％的PE，8.7重量％的PP，2.4重量％的PET，16.1重量％的聚丙烯酸酯和26.1重量％的无机填充物。 SEM和超深度三维（3D）显微镜的结果表明，随着研磨周期的增加，再生材料的畴尺寸变小。可以通过固态复合粉末的粒度和粒度分布来控制再生材料的区域尺寸和性能。动态力学分析（DMA）和X射线衍射（XRD）图谱表明S 3 M技术提高了组分之间的相容性并有效地减小了晶体的晶粒尺寸WAT中的PE。熔体流动指数和高毛细管流变测试表明，通过S 3 M研磨，回收材料的热加工性能得到了改善。回收材料的抗张强度和断裂伸长率分别达到12.6 MPa和96.3％。更重要的是，可以使用回收的材料制造具有良好性能和外观的低价木塑产品。

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