固化剂对有机改性凹凸棒石/聚苯胺环氧树脂复合涂层性能的影响

Influence of Curing Agent on Properties of Epoxy Resin Based Organic Attapulgite Clay/Polyaniline Coating

固化剂对涂层的防腐、力学性能起着至关重要的作用。以环氧树脂为成膜物质,采用原位复合法在环氧树脂体系中合成有机改性凹凸棒石/聚苯胺(OAT/PAn)复合涂层,分别使用改性脂肪胺固化剂593、酚醛胺固化剂T-31以及聚酰胺固化剂650对上述涂层进行固化,讨论了不同种类固化剂对涂层的化学结构、防腐和力学性能以及耐水性能的影响。利用FTIR对比了各涂层的固化结构,证明了三种固化剂均可使复合涂层固化;SEM结果表明,593固化剂固化涂层的致密性最好;电化学实验结果表明,593固化剂的固化涂层防腐性能最佳,腐蚀电位达到了Ecorr=-318 m V,腐蚀电流密度I_(corr)=1.193×10^(-6)A·cm^(-2);通过划格法评价了各涂层的附着力,发现593固化剂固化效果最好,附着力可达5B;对比浸泡168 h后涂层的耐水性发现,593固化剂耐水性最好。

The curing agent has very important effects on the anticorrosion and mechanical performance of coatings. The organic attapulgite clay/polyaniline（ OAT/PAn） based coatings were prepared by in-situ oxidative polymerization with epoxy resin（ ER） as bottom coat and OAT/PAn as additive. The coatings were cured by three kinds of curing agents including modified aliphatic amine 593,phenolic aldehyde amine T-31 and low molecular polyamide 650. The structures,anticorrosion,mechanical performance and water resistance of these coatings were discussed. The results showed that the composite coatings were completely cured by these three kinds of curing agents according to FTIR. The coating cured by 593 was more compact than others by SEM observations. The electrochemical test showed that the coating cured by 593 had a better corrosion protection performance,which corrosion potential and corrosion current density arrived to-318 m V and 1. 193 × 10^-6A·cm^-2,respectively. The adhesion strength of the coating after being cured by 593 was better than others,which reached 5B grade. Comparison with water-resistance for 168 h,the result indicated that the water hindrance capacity of the coating cured by593 was stronger than other curing agents.