Plastic Pipes Conference Association # 2012 Barcelona
Joseph Sebastian
The development of an antioxidant package for chlorine resistance of polyethylene pipe is a time-intensive exercise. The usual testing protocol consists of compounding a number of different additive packages into polyethylene, preparing molded samples and then aging these samples in a sodium hypochlorite bleach solution with monitoring of OIT and resin properties over time. This work describes the application of simple solution-phase bench-top experiments coupled to LC-MS as a rapid tool for evaluating various antioxidants through the analysis of antioxidant reaction products after exposure to a sodium hypochlorite bleach solution. This technique offers numerous benefits to the prevailing analysis techniques in that it involves minimal up-front sample preparation and laboratory costs, and makes it possible to easily track the ability of individual antioxidants to withstand chlorine exposure. Meaningful data can be gathered in hours or days instead of waiting weeks or months for the results of physical testing. The application of this rapid LC-MS technique to the development of an enhanced chlorineresistant additive package is described herein.
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