介绍了环氧固化剂的分类,包括显在型与潜伏型两大类,显在型主要有胺类、酸酐类、合成树脂类以及硫醇类,潜伏型以双氰胺和咪唑类为主。详细论述了各种环氧固化剂的优缺点,胺类可室温固化,酸酐类综合性能优异,合成树脂类与硫醇类分别具有耐化学性能与防腐性能。简述了多元胺类、叔胺类与咪唑类固化剂及固化机理,即通过固化剂中的活性原子进攻环氧基,开环加成形成交联结构并赋予环氧树脂性能。最后叙述了各类固化剂在胶黏剂与涂料中的应用,并展望了其在耐热性能、力学性能、绿色环保方面的发展趋势。
It introduced the types of epoxy curing agents, including both explicit and potential types. Explicit curing agents mainly included amine, maleic anhydride, synthetic resin and thiols while potential curing agents mainly included dicyandiamide and imidazolium. It discussed in detail the advantages and disadvantages of the curing agents, i.e. amine could be cured at room temperature, maleic anhydride had excellent comprehensive properties, synthetic resin and thiols were resistant to chemicals and corrosion. It also sketched the curing mechanism of polybasic amine, tertiary amine and imidazole curing agents, namely activity atoms attacked the epoxy groups to open the ring and form crosslinked structure, giving the epoxy resin good performances. Finally, it described their application in the field of adhesives and coatings, and forecasted the development trend in the aspects of mechanical properties, thermal properties and environmental protection.