TPU材料的热压成型工艺研究  

Study on Hot Pressing Process of TPU Material

作　　者：陈兵勇[1] 丁宁[1] 刘军 韩申 林春梅 李斌[1] CHEN Bingyong;DING Ning;LIU Jun;HAN Shen;LIN Chunmei;LI Bin(Hubei Insititute of Aerospace Chemical Technology,Xiangyang 441003,China)

机构地区：[1]湖北航天化学技术研究所,湖北襄阳441003

出　　处：《橡胶工业》2022年第5期380-383,共4页China Rubber Industry

摘　　要：介绍热塑性聚氨酯(TPU)材料的热压成型工艺,对比分析TPU材料热压成型前后的性能变化。结果表明:TPU材料的热压成型温度可根据流变曲线确定,应在软化温度与粘流温度之间,本研究确定为140~165℃;在热压成型时TPU材料由于受热氧环境的影响,TPU分子容易出现部分软段降解和断链,从而导致TPU材料相对分子质量减小、早期黄变和物理性能下降,而热压成型后采用快速冷却方式可显著减少这些现象。The hot pressing process of thermoplastic polyurethane(TPU)material was introduced,and the property changes of TPU material before and after hot pressing were compared and analyzed.The results showed that,the hot pressing temperature of TPU material could be determined according to its rheological curve and should be between its softening temperature and viscous flow temperature,which was determined as 140~165℃in this study.During hot pressing,some soft segments of TPU molecules were prone to degradation and chain breaking due to the influence of thermal oxygen environment,which led to the reduction of the molecular weight,early yellowing and decrease of the physical properties of the TPU material.These phenomena could be significantly reduced by rapid cooling method after hot pressing.

关 键 词：热塑性聚氨酯 热压成型 流变曲线 快速冷却 黄变 物理性能 

分 类 号：TQ334.1[化学工程—橡胶工业] TQ330.66