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Single-step exfoliation, acidification and covalent functionalization of α-zirconium phosphate for enhanced anticorrosion of waterborne epoxy coatings
Surfaces and Interfaces ( IF 6.2 ) Pub Date : 2020-12-20 , DOI: 10.1016/j.surfin.2020.100887
Li ML , Huang HW , Mo RB , Sheng XX , Jiang X , Zhang XY

Epoxy resin is widely used in the field of anticorrosive coatings for its outstanding properties. However, environmentally friendly two-component waterborne epoxy coatings often have micropores in its films, making their barrier properties against corrosive media unsatisfactory. α-zirconium phosphate (α-ZrP), known as a kind of flexibly designable two-dimensional nanoparticle, has outstanding mechanical and barrier properties. However, the common problem of incorporating such inorganic fillers into epoxy resins is the poor interface compatibility. In this work, α-ZrP was firstly exfoliated by Tris-(hydroxymethyl)-aminomethane (Tris) aqueous solution, then acidified by diluted hydrochloric acid (HCl) and finally covalently functionalized by 3-aminopropyltriethoxy silane (KH-550). Subsequently, waterborne epoxy composite coatings (KWEPc) with K-ZrP as functional filler were prepared and applied on Q235 carbon steel substrates by blade-coating. With KH-550 modifying, K-ZrP showed an improved dispersion in waterborne epoxy coatings (WEPc). The structure and morphology of prepared K-ZrP was characterized and confirmed by FTIR spectra, XPS and EDS-mapping. The results showed that K-ZrP is evenly modified with amino siloxane. Electrochemical tests revealed that the corrosion rate of KWEPc was one order of magnitude lower than that of WEPc. KH-550 act as a “bridge” among inorganic filler, epoxy resin matrix and Q235 carbon steel substrates.



中文翻译:

α-磷酸锆的单步剥离,酸化和共价官能化,可增强水性环氧涂料的防腐性能

环氧树脂以其优异的性能而广泛用于防腐涂料领域。然而,环保的两组分水性环氧涂料通常在其薄膜中具有微孔,从而使其对腐蚀性介质的阻隔性能不能令人满意。众所周知,α-磷酸锆(α-ZrP)是一种可灵活设计的二维纳米粒子,具有出色的机械性能和阻隔性能。然而,将这种无机填料掺入环氧树脂的常见问题是不良的界面相容性。在这项工作中,首先用Tris-(羟甲基)-氨基甲烷(Tris)水溶液剥离α-ZrP,然后用稀盐酸(HCl)酸化,最后用3-氨丙基三乙氧基硅烷(KH-550)共价官能化。后来,制备了以K-ZrP为功能性填料的水性环氧复合涂料(KWEPc),并通过刮涂法将其涂覆在Q235碳钢基材上。经过KH-550改性,K-ZrP在水性环氧涂料(WEPc)中的分散性得到了改善。通过FTIR光谱,XPS和EDS图谱表征并证实了所制备的K-ZrP的结构和形态。结果表明,K-ZrP被氨基硅氧烷均匀地改性。电化学测试表明,KWEPc的腐蚀速率比WEPc低一个数量级。KH-550充当无机填料,环氧树脂基体和Q235碳钢基材之间的“桥梁”。通过FTIR光谱,XPS和EDS图谱表征并证实了所制备的K-ZrP的结构和形态。结果表明,K-ZrP被氨基硅氧烷均匀地改性。电化学测试表明,KWEPc的腐蚀速率比WEPc低一个数量级。KH-550充当无机填料,环氧树脂基体和Q235碳钢基材之间的“桥梁”。通过FTIR光谱,XPS和EDS图谱表征并证实了所制备的K-ZrP的结构和形态。结果表明,K-ZrP被氨基硅氧烷均匀地改性。电化学测试表明,KWEPc的腐蚀速率比WEPc低一个数量级。KH-550充当无机填料,环氧树脂基体和Q235碳钢基材之间的“桥梁”。

更新日期:2021-01-18
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