Smoleń Jakub, Olesik Piotr, Jała Jakub, Adamcio Andrzej, Kurtyka Klaudia, Godzierz Marcin, Kozera Rafał, Kozioł Mateusz, Boczkowska Anna
Faculty of Materials Engineering, Silesian University of Technology, Krasińskiego 8 Street, 40-019 Katowice, Poland.
ANMET Company, Koszarowa 6/18 Street, 67-300 Szprotawa, Poland.
Polymers (Basel). 2022 Jul 19;14(14):2925. doi: 10.3390/polym14142925.
This work is devoted to evaluating the effectiveness of the recovery of carbon fibers from end-of-life wind turbine blades in the pyrolysis process, and the use of those fibers in the production of flat composite panels. The recovery of carbon fibers from wind turbine blades uses a pyrolysis process at 500-600 °C in a non-oxidizing atmosphere, in such a way that makes it possible to preserve the shape and dimensions of the fibers. Using recycled carbon fibers, flat CFRP sheets with epoxy resin matrix were produced by pressing. Seven different series of samples were tested, which differed in fiber length, fiber orientation, and pressure holding time. The results obtained on the recycled fibers were compared to the original carbon fibers, cut to corresponding lengths. Additionally, one of the series was reinforced with a biaxial fabric. The most favorable pressing parameters are empirically found to be pre-pressing 2 MPa (10 min), and further pressing at a pressure of 7 MPa until the resin completely cross-linked (about 120 min). A number of tests were carried out to demonstrate the usefulness of pyrolytic fibers, including tensile strength of carbon fibers, bending strength, SEM observations, FT-IR, and Raman spectroscopy. The tests carried out on the carbon fibers show that the pyrolysis process used leaves about 2% of the matrix on the surface of the fiber, and the tensile strength of the fibers drops by about 20% compared to the new carbon fibers. The research results show that the use of the recycled carbon fibers in the production of flat composite plates is reliable, and their mechanical properties do not differ significantly from plates made of corresponding original carbon fibers. Composite panels with the pyrolytic fibers (274 MPa) show up to a 35% higher flexural strength than similarly produced panels with the original new carbon fibers (203 MPa), which means that the panels can be used in the production of elements for footbridges, bridges, pipelines, or structural elements of buildings and roofing.
这项工作致力于评估在热解过程中从报废风力涡轮机叶片回收碳纤维的有效性，以及这些纤维在平板复合材料板生产中的应用。从风力涡轮机叶片回收碳纤维采用在500 - 600°C的非氧化气氛中进行热解的工艺，以这种方式能够保留纤维的形状和尺寸。使用回收的碳纤维，通过压制生产了具有环氧树脂基体的平板CFRP片材。测试了七个不同系列的样品，它们在纤维长度、纤维取向和保压时间方面有所不同。将回收纤维获得的结果与切割成相应长度的原始碳纤维进行了比较。此外，其中一个系列用双轴织物进行了增强。通过实验发现最有利的压制参数为预压2 MPa（10分钟），然后在7 MPa的压力下进一步压制，直到树脂完全交联（约120分钟）。进行了多项测试以证明热解纤维的实用性，包括碳纤维的拉伸强度、弯曲强度、扫描电子显微镜观察、傅里叶变换红外光谱和拉曼光谱。对碳纤维进行的测试表明，所采用的热解工艺在纤维表面留下约2%的基体，并且与新碳纤维相比，纤维的拉伸强度下降约20%。研究结果表明，在平板复合材料板的生产中使用回收碳纤维是可靠的，并且它们的机械性能与由相应原始碳纤维制成的板材没有显著差异。含有热解纤维的复合板（274 MPa）比同样生产的含有原始新碳纤维的板（203 MPa）的抗弯强度高出35%，这意味着这些板材可用于生产人行天桥、桥梁、管道或建筑物和屋顶的结构元件。
