双轴取向聚氯乙烯管材最佳拉伸温度和径向拉伸比的研究

Optimal tensile temperature and radial tensile ratio of biaxially oriented unplasticized poly(vinyl chloride)pipes

以聚氯乙烯(PVC)树脂为主要原料,通过一步法挤出加工方式,采用纯净配方,在配方和轴向拉伸比不变的情况下,将拉伸温度设置为80、85、88、90℃,径向拉伸比设为1.8(坯料管外径63 mm、壁厚5.2 mm)和1.9(坯料管外径为60 mm、壁厚6.0 mm)制备双轴取向聚氯乙烯(PVC-O)管材。通过对不同工艺生产的管材进行静液压试验、落锤冲击试验、拉伸试验、环刚度试验来表征管材的力学性能。结果表明,适合此配方和轴向拉伸比的PVC-O管挤出成型的最佳拉伸温度为85℃,最佳径向拉伸比为1.9。

Biaxially oriented polyvinyl chloride(PVC-O)pipes were prepared through one-step extrusion based on a pure formula using polyvinyl chloride resin as a main raw material. PVC-O pipes were prepared using the same formula through axial tensile at stretching temperatures of 80,85,88,90 oC and a radial stretching ratio to 1. 8/1(the outside diameter of the feedstock pipe:63 mm and wall thickness:5. 2 mm)and 1. 9/1(the outside diameter of the feedstock pipe:60 mm and wall thickness:6. 0 mm). The mechanical properties of the pipes produced through different processes were characterized through hydrostatic,falling-weight impact,tensile,and ring stiffness tests. The results indicated that the optimal tensile temperature of the PVC-O pipe extrusion was determined to be 85 oC,and its optimal radial tensile ratio was 1. 9/1.