受阻胺H-622改性B72及光稳定机理研究  

Studies on modification and the mechanism of photo stabilization of B72 using a hindered amine light stabilizer H 622

作　　者：吴晨[1] 王丽琴[1] 李迎[1] 

机构地区：[1]西北大学文化遗产学院,陕西西安710069

出　　处：《文物保护与考古科学》2012年第2期56-60,共5页Sciences of Conservation and Archaeology

基　　金：国家科技支撑计划项目资助(2010BAK67B12)

摘　　要：为了提高B72文物保护材料的耐光性能,采用高分子量受阻胺H-622对B72进行物理共混改性。监测了改性材料老化前后的颜色、失重等参数的变化,并探讨了受阻胺的稳定机理。实验结果表明,经受阻胺H-622改性后,材料的耐光老化性大大提高,红外光谱、接触角、失重、硬度等指标的变化明显较改性前降低。同时观察到老化近500h时,改性材料的颜色基本不变。受阻胺H-622对B72的稳定作用是由于受阻胺吸收光能后转变为可以再生的氮氧自由基,能捕获B72老化降解产生的自由基,从而阻止B72降解反应的不断进行。由此可见,采用受阻胺H-622改性B72是可行的,提供了一种延长B72寿命的新方法。To improve the anti - photoageing property of B72, a hindered amine light stabilizer having a high molecular weight, H -622, was selected to modify B72. The color change, weight loss and other parameters of the ageing process were monitored and the photo - stabilization mechanism was investigated. The experiment results showed that stability of the modified material was greatly enhanced after modification with the hindered amine light stabilizer H - 622. The infrared spectrum, contact angle, weight - loss, hardness and other parameters of the modi- fied material changed much less than did B72 itself after aging. Moreover, the color change of the modified material was negligible after about 500 hours of ageing. It is proposed that the mechanism of stabilization involves absorption of light by the hindered amine and generation of nitroxyl radicals, which can trap free radicals produced by degra- dation of B72, resulting in inhibition of the B72 degradation reaction. Therefore, it seems practical to modify B72 with hindered amine light stabilizer H - 622, thus providing a new method to extend the lifespan of B72.

关 键 词：受阻胺H-622 B72 改性 文物保护 光稳定机理 

分 类 号：O631[理学—高分子化学]