塑料给水管材中有机物迁移率的分析研究

Analysis on Organic Material Migration of Plastic Pipes for Water-conveying

模拟生活用水环境,将含有活性氯等化学试剂的水样封装在聚乙烯、聚氯乙烯等塑料给水管材中,用总有机碳仪连续测定不同温度、不同时间和不同游离氯条件下,管材向水样中总有机碳的释放量,以表征塑料给水管材中有机物的迁移率,考察不同高分子材料对水质的迁移性的影响,并以此监控管材的氧化降解程度,由此建立了塑料给水管材工作条件下卫生安全性的评价方法。结果显示,塑料管材在高温环境和测试水中含有消毒成分的活性氯的浓度增加的情况下,降解程度要增大;各类管材的迁移率并不是随着迁移期而简单递减或递增,而是存在一定的波动范围。

Reagent containing reactive chlorine was sealed in PVC,PE or other plastic pipes and the migration of organic species out of the pipes was monitored. The release amount of total organic carbon species （TOC） were determined continuously by a combustion TOC analyzer in environments of different chlorine content, temperature, and from various plastic pipes. It was found that higher temperature and higher reactive chlorine content resulted in higher rate of degradation of plastic pipes. From the experiment, a service performance evaluation method of plastic tubular material was established.