文物保护用环氧树脂的光稳定剂研究

Study on the stabUity of the epoxy resin E44 used for conservation with UV328

为了提高在文物保护中应用的环氧树脂的光稳定性,采用不同浓度的苯并三唑类紫外线吸收剂UV328对环氧树脂进行了耐光老化改性,并对改性后材料进行人工光老化,在老化过程中采用漫反射光谱技术和涂膜硬度跟踪监测了各种改性及未改性环氧树脂的光老化过程,同时采用傅立叶红外光谱衰减全反射技术(ATR-FTIR)以及拉力试验机测量了改性效果较好的环氧树脂及未改性环氧树脂在光老化过程中分子结构的变化和抗拉强度的变化,并推导了分子内异构化的光稳定机理。实验结果表明,UV328会先于基体材料(环氧树脂)将紫外线的能量吸收并通过分子内异构化的过程将其消散掉,从而起到保护基体材料的作用。从文物保护的角度出发,环氧树脂的最佳改性组合为3%UV328改性材料。

Epoxy resin is a conservation material commonly used in practice. However, its photo -oxidative stability is poor. In order to improve its stability, UV - 328 （ UV absorber） of different concentration was used and the modification of the epoxy resin was monitored. The photo - degradation and hardness of the modified and unmodified epoxy - resin were investigated by means of attenuated total reflection - Fourier transform infrared （ ATR - FT- IR） spectroscopy and diffuse reflectance spectroscopy （DRS）. According to the data of investigation, it was concluded that the epoxy resin with 3% UV328 has highest stability.