增强热塑性塑料管材高温水浴老化性能研究

老化易使高分子链断裂,使材料变脆、脱层、变色,严重制约了塑料管材在高温、高湿工况下的应用.以交联聚乙烯PEX、耐热聚乙烯PE-RT和高密度聚乙烯PE100为研究对象,进行90 ℃水浴老化.采用万能力学试验机、差示扫描量热仪、维卡软化温度测定仪研究了三种材料老化前后力学性能变化和耐热行为.结果表明,在90 ℃热水浴老化9...

Research on Aging Performance of Reinforced Thermoplastic Pipe(RTP)in High Temperature Water Bath

Aging was easy to cause the polymer chain fracture.And the materials could become brittle,delaminating and discoloration,which severely restricted the use of plastic pipe materials under high temperature and high humidity conditions.In this study,cross-linked polyethylene PEX,heat-resistant polyethylene PE-RT and high-density polyethylene PE100 were aged in a high-temperature water bath at 90℃.Electronic universal testing machine,differential scanning calorimeter,and the Vicat softening point temperature tester were used to study the changes in mechanical properties and heat-resistant deformation before and after aging.The results show that after 90 days of aging at 90℃,the mechanical properties and heat resistance of PE-RT,PE100 and PEX all have a decline trend.Among them,the cross-linked polyethylene PEX has the best tensile properties and heat resistance properties.Its tensile strength is more than 20 MPa,the Vicat softening point temperature is higher than 85℃,and oxidation induction time(OIT)at 220℃is longer than 20 min.It can be used as an alternative lining material for high temperature resistant non-metal composite pipes.