高等学校化学学报 ›› 2018, Vol. 39 ›› Issue (7): 1564-1572.doi: 10.7503/cjcu20170821

• 高分子化学 • 上一篇    下一篇

环氧树脂/硅基-纳米SiO2涂层的制备及防腐蚀性能

王英楠, 戴雪岩, 徐天璐, 曲立杰, 张春玲()   

  1. 吉林大学材料科学与工程学院, 汽车材料教育部重点实验室, 长春 130022
  • 收稿日期:2017-12-15 出版日期:2018-07-10 发布日期:2018-04-13
  • 作者简介:联系人简介: 张春玲, 女, 博士, 教授, 博士生导师, 主要从事环氧树脂阻燃/防腐蚀性能研究. E-mail: clzhang@jlu.edu.cn
  • 基金资助:
    吉林省科技厅项目(批准号: 20180101197jc)资助.

Preparation and Anticorrosion Properties of Silane Grafted Nano-silica/Epoxy Composite Coating

WANG Yingnan, DAI Xueyan, XU Tianlu, QU Lijie, ZHANG Chunling*()   

  1. College of Materials Science and Engineering, Jilin University,Key Laboratory of Automobile Materials, Changchun 130022, China
  • Received:2017-12-15 Online:2018-07-10 Published:2018-04-13
  • Contact: ZHANG Chunling E-mail:clzhang@jlu.edu.cn

摘要:

采用硅氢加成反应制备了2-(3,4-环氧环己基)乙基三乙氧基硅烷(ETEO), 用ETEO对纳米SiO2进行表面接枝得到新型硅基纳米SiO2(ETEO-SiO2), 并制备环氧树脂/ETEO-SiO2复合涂层. 利用傅里叶变换红外光谱(FTIR)、 氢核磁共振谱(1H NMR)与X射线光电子能谱分析(XPS)对ETEO和ETEO-SiO2进行了表征. 场发射扫描电子显微镜(FESEM)观察到ETEO-SiO2涂层横截面粗糙, ETEO-SiO2具有良好分散性. 接触角分析表明ETEO-SiO2涂层疏水性提高. 利用电化学阻抗实验与盐雾实验研究了复合涂层的防腐蚀性能, 结果表明, 添加ETEO-SiO2纳米粒子后涂层的防腐蚀性能远优于纯环氧树脂和纳米SiO2复合环氧树脂涂层, 当ETEO-SiO2纳米粒子添加量达到4%(质量分数)时, 防腐蚀性能最佳. 纳米SiO2表面接枝ETEO后, ETEO-SiO2纳米粒子与环氧树脂基体之间的相容性增加, 分散稳定性提高, 涂层更加致密, 减少了腐蚀介质所需的扩散通道并抑制腐蚀反应过程的进行, 提高了复合涂层的防腐蚀性能.

关键词: 复合涂层, 硅基纳米二氧化硅, 环氧树脂, 表面接枝, 防腐蚀性能

Abstract:

2-(3,4-Epoxycyclohexyl) ethyltriethoxysilane(ETEO) was synthesized by a highly effective hydrosilylation reaction using 1,2-epoxy-4-vinylcyclohexane and triethoxysilane as substrates and Karstedt catalyst as the catalyst. Different methods were employed to characterize the coatings. The surface of nano-silica was treated with ETEO in order to obtain a new silane grafted on nano-silica(ETEO-SiO2). The structure of ETEO was characterized by means of 1H nuclear magnetic resonance spectrometer and Fourier transform infrared spectroscopy. The X-ray photoelectron spectroscopy showed that ETEO was successfully grafted on nano-silica. In addition, the morphology of the coating cross section and dispersion of ETEO-SiO2 were investigated by field emission scanning electron microscopy. The wettability of the coating surface was analyzed by the contact angle measurement. The electrochemical impedance spectroscopy(EIS) and salt spray test of the composite coatings revealed that the corrosion resistance of coatings with ETEO-SiO2 nanoparticles was significantly improved as compared with that of the epoxy(EP) and SiO2/EP coatings. Corrosion resistance achieved the highest value when ETEO-SiO2 content reached 4%(mass fraction). It can be indicated that the SiO2 nano-particles grafted by ETEO enhanced its compatibility effectively in the organic matrix so that ETEO-SiO2 could distribute in the epoxy resin evenly. What’s more, the ETEO-SiO2 increased the shielding effect of the coating and filled the coating defects, which can reduce the corrosive diffusion channels and inhibit the progress of the corrosion reaction.

Key words: Composite coating, Silane grafted nano-silica, Epoxy resin, Surface treatment, Anticorrosion property

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