摘要
选用3种不同硬度的热塑性聚氨酯(TPU),对其添加色母料前后的胶料在旋转流变仪上进行了稳态和动态流变测试,并采用幂律方程进行了流变数据的拟合。结果表明:3种TPU刚开始流动时表现出明显的切力变稀行为,随着测试温度的升高,则均表现出明显的牛顿流体行为;当长期处于高温环境时,TPU容易发生交联从而降低其加工性能。对于邵氏硬度为82A的TPU胶料,当螺杆挤出设备的进料段温度为150～170℃、压缩段和均化段温度为170～190℃,挤出模具温度为170～180℃时,有利于涂覆织物挤出成型工艺的顺利实施。
Three kinds of thermoplastic polyurethane(TPU)with different hardness were used to test the rheological properties before and after adding color masterbatches,and the rheological data were fitted by power law equation.The results show that the three kinds of TPU exhibit obvious shear thinning behavior at the beginning of melting,and all samples exhibit obvious Newtonian fluid behavior with the increase of temperature.In a long-term high-temperature environment,TPU material is crosslinked,and the melt processing property becomes worse.When the TPU with hardness of 82 A is used in the extrusion process of coated fabric by the screw extruding equipment,the recommended feeding section temperature is 150~170℃,the compression and homogenization section temperature is 170~190℃,and the extrusion die temperature is 170~180℃.
作者
许朝玉
李华
黄忠耀
王兆理
蔡利海
Xu Chaoyu;Li Hua;Huang Zhongyao;Wang Zhaoli;Cai Lihai(Wuhan Research Institute of Materials Protection,Wuhan 430030,China;Institute of Military New Energy Technology,Academy of Systems Engineering,Academy of Military Sciences,Beijing 102300,China)
出处
《塑料科技》
CAS
北大核心
2019年第4期117-122,共6页
Plastics Science and Technology
关键词
热塑性聚氨酯
流变性能
切力变稀
挤出工艺
Thermoplastic polyurethane
Rheological property
Shear thinning behavior
Extrusion process
