A comparative investigation was conducted on degradation behaviors of a spray-free polypropylene material between outdoor exposure at four national standard natural exposure places and indoor accelerated weathering under three typical artificial conditions.The correlation between the above two weathering behaviors was studied and the weathering factors were analyzed.The results indicated that there was no correlation observed in the color difference between the 12-month natural exposure at four testing places and the artificial accelerated weathering.However,a change in gloss for the tested specimens obtained from Qionghai and Lhasa indicated a good correlation with artificial accelerated weathering under the condition 1,and furthermore,the result from the natural exposure at Qionghai presented a much better correlation.The acceleration rate of laboratory weathering under the condition 1 was double in comparison with that from the outdoor exposure at Qionghai.UV irradiation and water were found to play critical roles in the weathering of spray-free polypropylene materials.%采用免喷涂聚丙烯(PP)材料,分别在国内4个不同类型的自然暴晒试验场和3种典型的实验室人工加速老化试验条件下,进行相关性研究和老化影响因素的初步探讨.结果表明,色差方面,4个试验场的自然暴晒12个月与人工加速老化的相关性均很差;光泽方面,琼海和拉萨暴晒12个月与人工加速条件1的相关性较好,其中琼海与条件1的相关性最好;对于光泽变化,人工加速条件1较之琼海自然暴晒的加速倍率约为2倍;辐照量紫外线(UV)部分和水是造成免喷涂PP材料老化的主要因素.
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