Effect of High Intensity Ultraviolet Irradiation on Properties of Modified Polyethylene
The high-dose ultraviolet(UV)aging test of high density polyethylene(HDPE)composites modified by different contents of compound light stabilizer was tested by UV aging test chamber with UV irradiation intensity of 500 W/m2.Fourier transform infrared spectroscopy(FTIR)test showed that the carbonyl index was positively correlated with the aging degree of HDPE.The aging rate of HDPE was significantly reduced by the addition of ultraviolet additives.The molecular weight of modified HDPE was analyzed by rotating rheology,which could found that the crosslinking reaction rate of HDPE was inhibited more with the increase of ultraviolet additives in the early aging period.Combined with the above analysis and mechanical test results,it was found that when the modified HDPE material needed to withstand the total ultraviolet irradiation of 200 kWh/m2,the modified HDPE material could maintain good properties by only adding 1.2 phr compound light stabilizer in 100 phr matrix.The retention rates of elongation at break,tensile strength and notch impact strength were 57.7%,63.8%and 105.0%,respectively.
High intensity UV irradationTotal UV exposureHDPECompound light stabilizer
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