Wang Andong, Guo Junhao, Shao Chenkang, Chen Caifeng
School of Materials Science and Engineering, Jiangsu University, Zhenjiang, Jiangsu, China.
3D Print Addit Manuf. 2024 Oct 22;11(5):e1810-e1818. doi: 10.1089/3dp.2023.0111. eCollection 2024 Oct.
Currently, there is great demand for flexible three-dimensional (3D) printable thermoplastic polyurethane (TPU) wires with excellent ultraviolet (UV) resistance, which have broad application prospects in wearable products. In this study, UV-resistant TPU composites were obtained using a blending modification method. The relationship between the optimized parameters of fused deposition modeling 3D printing and mechanical properties of the TPU composite is discussed using an orthogonal test. This study observed that the UV absorption properties of TPU composites were enhanced, and the TiO and TiO/ZnO fillers improved the tensile strength of TPU composites. After UV aging, the tensile strength and elongation of the TPU composite slightly decreased, but were still much higher than those of pure TPU. Among the printing parameters, printing speed had the greatest influence on the mechanical properties of TPU composites. When the printing speed was 80 mm/s, printing layer thickness was 0.25 mm, nozzle temperature was 220°C, and hot bed temperature was 50°C, the TPU composites exhibited the best elongation at break and tensile strength. After regression analysis, two regression models for the elongation at break and tensile strength of TPU composites were obtained and verified, which provide a reference for predicting the relationship between the printing parameters and mechanical properties of flexible TPU composites.
目前，对具有优异抗紫外线（UV）性能的柔性三维（3D）可打印热塑性聚氨酯（TPU）线材有很大需求，其在可穿戴产品中具有广阔的应用前景。在本研究中，采用共混改性方法制备了抗紫外线TPU复合材料。利用正交试验探讨了熔融沉积建模3D打印的优化参数与TPU复合材料力学性能之间的关系。本研究观察到TPU复合材料的紫外线吸收性能得到增强，TiO和TiO/ZnO填料提高了TPU复合材料的拉伸强度。经过紫外线老化后，TPU复合材料的拉伸强度和伸长率略有下降，但仍远高于纯TPU。在打印参数中，打印速度对TPU复合材料的力学性能影响最大。当打印速度为80 mm/s、打印层厚度为0.25 mm、喷嘴温度为220°C、热床温度为50°C时，TPU复合材料表现出最佳的断裂伸长率和拉伸强度。经过回归分析，得到并验证了TPU复合材料断裂伸长率和拉伸强度的两个回归模型，为预测柔性TPU复合材料的打印参数与力学性能之间的关系提供了参考。
