| 摘要: |
| 石墨烯材料作为填料加入到聚合物涂层中可以有效提高涂层防腐性能。以提高 GO 分散性获取高防腐性能复合涂层为切入点，采用 2-6 二氨基吡啶为改性剂制备改性氧化石墨烯复合材料(BGO)，分析改性温度、改性剂配比量对 BGO 制备及防腐性能影响。再将 BGO 添加到环氧树脂中制备改性氧化石墨烯复合涂层(BGO / EP)，探究 BGO 添加量对复合涂层防腐性能的影响，并揭示涂层防腐机理。XRD、Raman、FT-IR、SEM、AFM、TEM 等系列表征结果表明 2-6 二氨基吡啶成功接枝到 GO 表面。当反应温度为 80 ℃，改性剂与 GO 配比量为 1∶5 时，对 GO 的改性效果最佳。电化学试验、盐雾试验和附着力试验结果证明，BGO 的添加对环氧树脂防腐性能有明显提升作用，且当添加量为 0.1 wt.%时效果最佳。在 3.5% NaCl 溶液中浸泡 10 d 后 BGO / EP 的涂层电阻仍达到 1.03 G?·cm2 ，比纯环氧树脂涂层的 38.9 k?·cm2提高了 5 个数量级，比改性前的 GO / EP 复合涂层的 262 k?·cm2提高了 4 个数量级，防腐性能显著提高。研究成果可为进一步优化石墨烯基防腐涂层制备工艺，探究氨基改性氧化石墨烯复合材料在环氧树脂中的分散效果，挖掘其在涂层体系中的作用机理奠定基础。 |
| 关键词: 2-6 二氨基吡啶 氧化石墨烯 氨基改性 防腐涂层 |
| DOI：10.11933/j.issn.1007-9289.20210617002 |
| 分类号:TG174 |
| 基金项目:广州市科技计划(202002030321)；内蒙古自治区科技计划(2019GG238)；广东省学位与研究生教育改革研究(2019JGXM15)；广东省高等教育教学研究和改革(2020059)；广东省研究生教育创新计划(82620516)；广州市创新领军团队(201909010006)资助项目 |
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| Preparation and Anticorrosion Performance of 2-6 Diaminopyridine Modified Graphene Oxide Composite Coating |
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GUO Hongfei1,2, ZHAO Zengqi3, CHAO Bao4, NAN Ding5, LIU Jingshun6
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1.Institute of Physical Internet, Jinan University, Zhuhai 519070 , China;2.College of Intelligent Systems Science and Engineering, Jinan University, Zhuhai 519070 , China;3.Baotou Research Institute of Rare Earths, Baotou 014030 , China;4.College of Mechanical Science and Engineering, Huazhong University of Science and Technology,Wuhan 430074 , China;5.College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021 , China;6.College of Materials Science and Engineering, Inner Mongolia University of Technology,Hohhot 010051 , China
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| Abstract: |
| The addition of graphene materials as fillers to polymer coatings can effectively improve the anticorrosion properties of coatings. To improve the dispersion of graphene oxide and obtain a composite coating with high anticorrosion performance, 2-6 diaminopyridine is used as a modifier to prepare the modified GO composite (BGO). The effects of modification temperature and the proportion of modifiers on the preparation and anticorrosion performance of BGO are analyzed. The modified GO composite coating (BGO / EP) is prepared by adding BGO to epoxy resin. The influence of the addition amount of BGO on the anticorrosion performance of the composite coating is investigated, and the anticorrosion mechanism of the coating is revealed. The results of XRD, Raman, FT-IR, SEM, AFM and TEM show that 2-6 diaminopyridine is successfully grafted onto GO surface. The best modification effect of GO is obtained when the reaction temperature is 80 ℃ and the ratio of modifier to GO is 1∶5. The results of electrochemical test, salt spray test and adhesion test show that the addition of BGO significantly improves the corrosion resistance of epoxy resin, and the best effect is obtained when the addition amount is 0.1 wt.%. After soaking in 3.5% NaCl solution for 10 d, the coating resistance of BGO / EP still reaches 1.03 G?·cm2 , which is 5 orders of magnitude higher than the 38.9 k?·cm2 of pure epoxy resin coating, 4 orders of magnitude higher than the 262 k?·cm2 of GO / EP composite coating, the anticorrosion performance of coating is significantly improved. The research results can lay a foundation for further optimizing the preparation process of graphene-based anticorrosion coatings, exploring the dispersion effect of amino modified graphene oxide composites in epoxy resin, and exploring its mechanism of action in the coating system. |
| Key words: 2-6 diaminopyridine graphene oxide amino modification anticorrosion coating |
