BaSO_(4)/TPU纳米复合材料的制备及其性能研究

Preparation and properties of BaSO4/TPU nanocomposites

食品行业用输送带在运转过程中,可能会出现面层塑料颗粒脱落黏附在食品上,造成食品质量不合格,对人体健康产生负面影响。因此,开展可X射线探测的面层材料改性研究十分重要。本文通过熔融共混法制备了BaSO_(4)/热塑性聚氨酯弹性体(TPU)纳米复合材料。通过扫描电子显微镜(SEM)、傅里叶变换红外光谱(FTIR)、热失重分析(TGA)、硬度和拉伸试验等系统地进行BaSO_(4)/TPU纳米复合材料的结构、热稳定性能和力学性能的表征。特别地,通过X射线透视测试表征复合材料的X射线显影性能。SEM表明BaSO_(4)以纳米尺寸均匀分散在TPU基体中。力学性能测试结果表明,BaSO_(4)对TPU有增强作用,BaSO_(4)添加量为10wt%时,BaSO_(4)/TPU纳米复合材料的综合力学性能最佳,拉伸强度、断裂伸长率和断裂功较未改性TPU提高了10.19%、30.09%和31.92%。TGA测试结果表明BaSO_(4)/TPU复合材料的高温热稳定性有所提高。此外,通过添加纳米BaSO_(4),复合材料的X射线显影性能也得到了改善,从而实现在输送带面层中的应用。

During the operation of the conveyor belt used in the food industry,the plastic particles on the surface layer may fall off and adhere to the food,resulting in unqualified food quality and a negative impact on human health.Therefore,it is of great importance to research the modification of surface layer materials that can be detected by X-rays.In this study,BaSO4/thermoplastic polyurethane(TPU)nanocomposites were prepared by the melt blending method.The phase morphology,thermal stability,and tensile property of BaSO4/TPU nanocomposites were systematically characterized by scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FTIR),thermal gravimetric analysis(TGA),hardness,and tensile property tests.In particular,the X ray developing properties of the composites were characterized by X ray fluoroscopy tests.SEM shows that BaSO4/TPU nanocomposites are the best.The tensile strength,elongation at break and work of fracture improve by 10.19%,30.09%and 31.92%compared to unmodified TPU.The TGA test results show that the high-temperature thermal stability of BaSO4/TPU nanocomposites is improved.In addition,by adding BaSO4,the X ray developing properties of the composites are also improved,thus realizing the application in the surface layer of conveyor belts.