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Effects of resin/curing agent stoichiometry and coalescence of emulsion particles on the properties of waterborne epoxy coatings upon accelerated weathering
Materials Chemistry and Physics ( IF 4.6 ) Pub Date : 2021-09-09 , DOI: 10.1016/j.matchemphys.2021.125228
Emerson Colonetti 1 , Renan Rovani 2 , José Luiz Westrup 1 , Rodrigo Cercená 1 , Maykon Cargnin 1 , Michael Peterson 1 , Alexandre Gonçalves Dal-Bó 1
Affiliation  

The properties of waterborne epoxy coatings applied to 1020 carbon-steel plates were evaluated based on two factors: stoichiometry and the amount of coalescing aid used. The effects of the interactions between these two factors on coating properties were evaluated at three levels using a 32 factorial design and the Statistica 13.3-Trial software. The coatings were subjected to accelerated weathering and salt-spray tests and evaluated based on gloss, yellowing, Fourier-transform infrared spectroscopy, atomic force microscopy, and differential scanning calorimetry. The evaluation of gloss showed that stoichiometry (F = 334.45) was a more important factor than the amount of coalescent (F = 62.81). An excess amount of curing agent produced glossier coatings. Yellowing was strongly influenced by both factors, with lower amounts of curing agent and higher amounts of coalescent resulting in coatings with higher resistance to yellowing. A salt-spray test was conducted to evaluate the corrosion resistance of the coatings. The coatings produced with an excessive amount of coalescent and curing agents exhibited the lowest corrosion resistance. The best results were obtained with 7% coalescent agent and reduced amounts of curing agent.



中文翻译:

树脂/固化剂化学计量和乳液颗粒聚结对水性环氧涂料加速老化性能的影响

根据两个因素评估应用于 1020 碳钢板的水性环氧涂料的性能:化学计量和聚结助剂的用量。这两个因素之间的相互作用对涂层性能的影响使用 3 2析因设计和 Statistica 13.3-Trial 软件。涂层经过加速老化和盐雾测试,并根据光泽、黄化、傅里叶变换红外光谱、原子力显微镜和差示扫描量热法进行评估。光泽度的评估表明,化学计量比 (F = 334.45) 是比聚结剂的量 (F = 62.81) 更重要的因素。过量的固化剂产生更光泽的涂层。黄变受这两个因素的强烈影响,固化剂用量较少,成膜助剂用量较多,导致涂层具有更高的抗黄变能力。进行盐雾试验以评估涂层的耐腐蚀性。使用过量的聚结剂和固化剂生产的涂层表现出最低的耐腐蚀性。

更新日期:2021-09-12
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