摘要
介绍了反应堆环氧树脂涂层热老化的典型特征,通过差示扫描量热分析仪(DSC),红外光谱分析(IR)和热老化失重率的测量,研究了3种不同环氧/胺的核电站环氧涂层的老化过程,分析了热老化的化学机理。结果表明,化学计量比为0.7的环氧系统由于自身后固化作用,对热氧化抵抗力较高;系统交联网络密度没有发生变化;热老化主要来源于氧原子与交联网络节点氮原子的反应,酰胺和羧基为主要氧化产物;酸基团的出现预示分子链的断裂。
The durability of epoxy resin coating exposed in oxygen atmosphere at 110 ℃ for 5000 h has been studied by means of infrared spectroscopy （IR） and differential scanning calorime- try （DSC） to examine the evolution of chemical structure and the density of epoxy network for three kinds of epoxy coatings. The results show that the epoxy system with a stoichiometric ratio of 0.7 had a better resistance to thermal-oxidation, which might be resulted from the strong post-cur- ing ability of the epoxy coating. The density of the 3 coatings after crosslinking treatment exhibited little change. Thermal aging was mainly derived from the reaction of the oxygen atoms with nitro- gen atom on the cross-linked network nodes, while amide and carboxyl groups were the main oxi- dation products. Therewith the presence of acid groups might facilitate the fracture of molecular chains.
出处
《腐蚀科学与防护技术》
CAS
CSCD
北大核心
2013年第6期499-503,共5页
Corrosion Science and Protection Technology
关键词
有机高分子材料
热老化
化学结构分析
失重率
organic polymer material, thermal-oxidation, chemical structure characterization,mass loss rate
