PVC-O管材生产加工及其特性评价

Production and processing of PVC-O pipes and their characteristics evaluation

PVC-O管材是在PVC材料的玻璃化转变温度上通过双向拉伸对材料的分子进行重新排列,使材料(管壁)形成网状结构,能够承受发源于材料机体微细裂纹或管壁表面划痕的脆性破坏,使管材的强度、韧性和抗开裂性能得到显著提升。双轴取向聚氯乙烯(PVC-O)管材是通过特殊的取向加工工艺制造的管材,这一加工工艺是把采用挤出方法生产的PVC-U管材进行轴向拉伸和径向拉伸,使管材中的PVC长链分子在双轴向规整排列,获得高强度、高韧性、高抗冲、抗疲劳的新型PVC管材,性能远优于普通PVC-U管材。开发PVC-O管材,可以大大节约原材料资源,降低成本,提高产品性能,具有明显的经济效益和社会效益。

PVC-O pipe is a kind of material that rearranges the molecules of the material through biaxial tension at the glass transition temperature of the PVC material, so that the material （pipe wall） forms a network structure, which can withstand brittle damage originating from micro-cracks or scratches on the surface of the pipe wall, and the strength, toughness and crack resistance of the pipe are significantly improved. Biaxial oriented polyvinyl chloride （PVC-O） pipes are manufactured by special oriented processing technology. This processing technology is the axial and radial stretching of PVC-U pipes manufactured by extrusion method. The long chain molecules of PVC in the pipes are arranged regularly in the biaxial direction to obtain high strength, high toughness, high impact resistance and fatigue resistance. The performance of the new PVC pipe is much better than that of the common PVC-U pipe. The development of PVC-O pipes can greatly save raw material resources, reduce costs, improve product performance, and have obvious economic and social benefits.