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首页> 外文期刊>Journal of Applied Polymer Science >Development and preparation of high-performance thermoplastic vulcanizates based on blends of natural rubber and thermoplastic polyurethanes
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Development and preparation of high-performance thermoplastic vulcanizates based on blends of natural rubber and thermoplastic polyurethanes

机译：基于天然橡胶和热塑性聚氨酯共混物的高性能热塑性硫化橡胶的开发和制备

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摘要

Natural rubber (NR)/thermoplastic polyurethane (TPU) blends were prepared with a dynamic vulcanization technique. The main objective was to prepare high-performance thermoplastic vulcanizates (TPVs) based on natural rubber [thermoplastic natural rubber (TPNR)] with low hardness values and improved thermal and mechanical properties. In this study, the preparation of dynamically cured NR/TPU blends was carried out systematically, and the final properties were compared to those of typical commercial TPVs. The influence of sulfur-cured systems, accelerator types, process parameters, and rubber types were investigated. The developed NR/TPU-based TPNRs showed better tensile strengths and thermal properties than commercial TPVs with similar hardnesses. Moreover, the epoxidized natural rubber (ENR)/TPU-based TPNRs exhibited a low compression set. The incorporation of NR into the TPU reduced the Shore A hardness to about 60 in comparison to a value of about 85 for the neat TPU; the blends also showed improved oil resistance (oil swelling = 12%) in comparison to commercial TPVs with similar hardnesses. The experimental results indicate that high-performance TPNRs with low hardness values could be prepared with the proper conditions developed in this study.
机译：采用动态硫化技术制备天然橡胶（NR）/热塑性聚氨酯（TPU）的混合物。主要目标是制备基于天然橡胶[热塑性天然橡胶（TPNR）]的高性能热塑性硫化橡胶（TPV），该橡胶具有较低的硬度值并具有改善的热性能和机械性能。在这项研究中，系统地进行了动态固化的NR / TPU共混物的制备，并将最终性能与典型的商用TPV进行了比较。研究了硫磺硫化体系，促进剂类型，工艺参数和橡胶类型的影响。已开发的基于NR / TPU的TPNR比具有类似硬度的商用TPV表现出更好的拉伸强度和热性能。此外，环氧化天然橡胶（ENR）/ TPU基TPNR的压缩永久变形低。将NR掺入TPU中，肖氏A硬度降低至约60，而纯净TPU的肖氏A硬度约为85。与具有相似硬度的商用TPV相比，共混物还显示出更高的耐油性（油溶胀度= 12％）。实验结果表明，可以在本研究开发的适当条件下制备低硬度值的高性能TPNR。

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