以阻燃改性环氧树脂为研究对象,添加不同配比的光稳定剂Tinuvin 770和抗氧剂Irganox 1010,研究紫外老化对材料性能的影响.对紫外老化前后材料的化学结构、表面形貌、力学性能、阻燃性能和热性能等进行测试分析,研究表明紫外线会破坏阻燃剂的结构,使得环氧树脂发生降解和氧化.两种助剂的加入使紫外老化后试样的力学性能保留率和阻燃性能得到提升,其中,只添加抗氧剂Irganox 1010的试样在老化28 d后性能表现最优异,拉伸、弯曲强度保留率从未添加助剂试样的80.37%、81.61%分别提升到100.10%、92.50%,极限氧指数(Limiting oxygen index,LOI)由34.4%提升到37.5%,老化后的试样也表现出更好的热稳定性.结果表明,添加抗氧剂Irganox 1010对提升阻燃改性环氧树脂的抗紫外老化效果最佳.
The effect of UV aging on the properties of flame retardant modified epoxy resin(E51)after adding different ratios of light stabilizer Tinuvin 770 and antioxidant Irganox 1010 was studied.Chemical structure,surface morphology,mechanical properties,flame retardant properties and thermal properties were tested,it is found that UV irradiation destroys the structure of flame retardants,and degrades and oxidizes epoxy re-sins.Different ratios of anti-aging agents improve the retention rates of mechanical properties and flame retardant properties.Antioxidant-only samples showed the best performance after 28 d of aging.The retention rates of tensile and flexural strengths increased to 100.10%and 92.50%,compared with 80.37%and 81.61%of the samples without anti-aging agent.The limiting oxygen index(LOI)increased from 34.4%to 37.5%and the antioxidants made the thermal stability of the samples better.The results show that the addition of antioxidant Irganox 1010 is the best for improving the anti-ultraviolet aging properties of flame retardant modified epoxy resin.