纳米TiO2改性环氧涂层对玻璃纤维/不饱和聚酯复合材料紫外-凝露老化特性的影响

通过紫外-凝露加速老化试验，考察了纳米TiO₂改性环氧涂层对玻璃纤维/不饱和聚酯复合材料各种性能的影响。研究了紫外-凝露环境中不同纳米TiO₂含量的纳米TiO₂改性环氧涂层的颜色及硬度变化。并研究了未涂覆涂层、涂覆环氧涂层及2wt%TiO₂改性环氧涂层的玻璃纤维/不饱和聚酯复合材料的颜色变化、质量变化、弯曲性能及剪切性能变化规律。发现紫外-凝露环境下老化90天后未涂覆涂层、涂覆环氧涂层及2wt% TiO₂改性环氧涂层玻璃纤维/不饱和聚酯复合材料弯曲强度分别下降了14.7%、10.0%和9.2%，弯曲模量分别下降了5.9%、5.4%和3.2%。考虑紫外、湿度、温度共同作用，对古尼耶夫剩余强度公式进行修正，预测了纳米 TiO₂改性环氧涂层玻璃纤维/不饱和聚酯复合材料的寿命。 

Effect of nano TiO2 modified epoxy coating on UV-condensation aging characteristics of glass fiber/unsaturated polyester composite

The effect of nano TiO₂ modified epoxy coating on the properties of glass fiber/unsaturated polyester composite was investigated by UV-condensation accelerated aging test. The change of color and hardness of epoxy coating modified by different content of nano TiO₂ in UV-condensation environment was studied. Moreover, the color change, mass change, flexural and shear properties of glass fiber/unsaturated polyester composite without coating, with epoxy coating and 2wt% TiO₂ modified epoxy coating were investigated. The results indicate that the flexural strength of the glass fiber/unsaturated polyester composites without coating, with epoxy coating and 2wt% TiO₂ modified epoxy coating decreases by 14.7%, 10.0%, and 9.2% respectively after aging for 90 days in UV-condensation environment; the flexural modulus decreases by 5.9%, 5.4%, and 3.2%, respectively. Considering the interaction of UV, humidity and temperature, Gunyaev’s residual strength formula was modified, and the life of the glass fiber/unsaturated polyester composites was predicted.