Study on the correlation between accelerated aging and natural aging of silicone adhesive
A single-component silicone adhesive was selected to carry out natural atmospheric exposure tests at two test stations in Mohe and Dunhuang under typical climatic conditions in China,and at the same time,four artificial accelerated aging tests,namely hot air aging,hydrothermal aging,high and low temperature alternating aging and xenon lamp aging,were conducted in laboratory environment.By testing three mechanical properties of silicone adhesive samples after aging,namely tensile strength,elongation at break and tensile shear strength,the grey correlation analysis method was used to calculate the correlation degree between natural aging and various artificial accelerated aging conditions.The accelerated aging conditions with the most similar degradation trend to natural aging were identified,and the Pearson correlation coefficient method was used to verify the results.Furthermore,the acceleration factor was calculated,and based on the acceleration factor,the performance degradation law of silicone adhesive during natural aging could be quickly predicted.The research results showed that when the retention rate of tensile shear strength was used as the performance degradation index,the correlation between xenon lamp aging test and natural aging test in Mohe and Dunhuang area was the highest,with correlation coefficients of 0.92 and 0.95,and acceleration factors of 5.51 and 4.14,respectively.
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