Study on the Method of Predicting Service Life of Coated Steel Sheets (VI)

X-Ray Evaluation of Weathering Resistance of Polyvinyl Chloride Resin Film

Abstract

Study was made of the coating effect of chrome yellow when applied as a coloring pigment for a polyvinyl chloride resin film and also of the applicability of an X-ray radiation test as an accelerated deterioration test of polyvinyl chloride resin. The results show that :
(1) As compared with the non-coating chrome yellow not subjected to coating treatment, the heavy-coating chrome yellow with the surface coated with alumina and silica is chemically stable. The coating effect is evaluated by the generation of coating crack, discoloring, decomposition of the chrome yellow and generation of lead chloride in the X-ray radiation test and the dew cycle weatherometer test.
(2) In the X-ray radiation test, dew cycle weatherometer test and outdoor weathering test, the decomposition of polyvinyl chloride resin changed with time exponentially, indicating a correlation among them. In the X-ray radiation test, the polyvinyl chloride resin decomposed at a rate 10⁴ times higher than in the outdoor weathering test, which indicates that it is possible by the X-ray radiation test of a very short time to estimate the decomposition rate of polyvinyl chloride resin in the dew cycle weatherometer test or outdoor weathering test.