泡沫夹克管聚乙烯防护层的老化机理和解决方案

Aging Mechanism and Solutions of the Polyethylene Protective Layer in Foam Jacket Tubes

聚乙烯是由乙烯单体聚合而成的聚合物,是目前泡沫塑料外套保护层的主要材料。在实际生产工作中,泡沫夹克管在不进行防护的情况下存放一定时间后,聚乙烯防护层的拉伸强度及断裂伸长率严重降低,严重影响了泡沫夹克管的整体质量。通过对用于压力管道的聚乙烯树脂材料的光氧老化及热氧老化机理的分析,对用于"一步法"泡沫夹克管工艺的聚乙烯材料的分类及其性能的分析,同时结合实际生产对其老化性能进行分析研究,应用物理方法及化学方法讨论泡沫夹克管聚乙烯保护层的防老化对策,最终得出了光稳定剂和抗氧剂对抗老化的作用,及助剂的复合配比用量对老化性能的影响。

Polyethylene l is polymerized by ethylene monomer,and it is the main material for the protective layer of polyfoam jacket.During the actual production work,for foam jacket tubes without any protection,the tensile strength and elongation at break of the polyethylene protective layer are seriously reduced after a long storage time,which seriously affects the whole quality of the foam jacket tube.Light oxygen aging and thermal oxidative aging mechanism of the polyethylene resin materials for pressure pipes are analyzed,classification and performance of the polythene material used for"one step method"foam jacket tube technique are analyzed,and its aging properties are analyzed combined with actual production.Anti-aging countermeasures of the foam jacket tube polyethylene protective layer are discussed by applying physical and chemical methods.Finally,the effects of light stabilizer and antioxidants on anti-aging are obtained,and the compound ratio of additives also affects the aging properties.