光稳定剂应用在PET之探讨

摘要

在聚对苯二甲酸乙二醇酯(PET)中添加了不同类型的紫外光吸收剂(EV234、ST13006、ST13024)和受阻胺光稳定剂(EV9l、EV94),考察它们对PET的紫外光阻隔率和耐候性的影响.利用DOE实验设计法,找出最佳的光稳定剂比例.并通过人工加速老化实验研究了光稳定剂对PET耐候性的影响.结果表明,当质量分数比EV234∶ST13006∶ST13024≈0.52∶0.48∶0时,能达到390 nm透光率约为0.01％,及420 nm透光率约为84.45％.增加ST13006在PET里的有效含量,可以增加相对保护效果,当添加1％ ST13006时,PET经1000h加速老化后的黄色指数即耐候性可比未添加ST13006时提高59.93％.%Different types of UV absorbers (EV234,ST13006,ST13024) and hindered-amine light stabilizers (EV91,EV94) were added in polyethylene terephthalate (PET) resin,and effects of the light stabilizers on the UV cut-off capability and the weatherability of PET,were also determined.DOE method was used to find the optimal proportion of the light stabilizers.And effects of the light stabilizers on the weatherability of PET were examined by artificial accelerated aging tests.Results showed that light transmittance of PET specimens at 390 nm and at 420 nm were about 0.01％ and 84.45％ respectively when concentration ratio of EV234/ST13006/ST13024 was about 0.52/0.48/0.And increasing the concentration of ST13006 in PET specimen could effectively enhance the UV cut-off capability.When 1 wt％ ST13006 was added in the PET specimen,the yellow index (YI) of the specimen after 1 000 h aging time was increased by 40.16％ than the blank one.