动态硫化工艺对MVQ/TPU热塑性硫化胶性能的影响

Effect of dynamic vulcanization process on the properties of MVQ/TPU thermoplastic vulcanizate

在转矩流变仪中制备了动态硫化的硅橡胶(MVQ)/热塑性聚氨酯(TPU)共混型热塑性硫化胶(TPV),研究了不同动态硫化制备工艺(M_(1)、M_(2)、M_(3)、M_(4))对其力学性能和微观形态的影响,并且考察了动态硫化温度和转子转速等工艺条件对TPV力学性能的影响。结果表明,采用M1和M3方法制备的TPV力学性能较好,M3-TPV试样的表面微观相态结构分布更为均匀,橡胶粒子的尺寸较小,并且由M3方法制备的TPV网络结构最强。随着共混温度和转子转速的升高,TPV的力学性能总体上呈现先上升后下降的趋势;TPV的拉伸强度在动态硫化时间超过8 min后有缓慢上升的趋势;随着成型温度的升高,TPV的拉伸强度及断裂伸长率呈现先大幅度增加后下降的趋势。综合考虑,确定最佳的加工工艺:采用制备方法M3,动态硫化温度为180℃,转速为80 r/min,动态硫化时间为10 min,模压成型温度为190℃。

Dynamic vulcanized thermoplastic polyurethane(TPU)/methyl vinyl silicone rubber(MVQ)thermoplastic vulcanizates(TPV)were prepared in torque rheometer.The effects of different dynamic curing processes on the mechanical properties and micromorphology were studied.The effects of dynamic curing temperature and rotor speed on the mechanical properties of TPV were also investigated.The results showed that the mechanical properties of TPV prepared by M3 were better,and the surface microstructure of the M3-TPV sample was more evenly distributed,and the size of rubber particles was smaller,and the TPV network structure prepared by M3 was the strongest.With the increase of blending temperature and rotor speed,the mechanical properties of TPV generally showed a trend of first increasing and then decreasing.The tensile strength of TPV increased slowly after the dynamic curing time exceeded 8 min.With the increase of forming temperature,the tensile strength and elongation at break of TPV showed a trend of first increasing greatly and then decreasing.After comprehensive consideration,the optimal processing technology was as follows:preparation method M3,dynamic curing temperature 180℃,rotating speed 80 r/min,dynamic curing time 10 min,and molding temperature 190℃.