Kang Lei, Zeng Qiao, Fan Jiang, Dang Xinzhe, Chen Hu, Yan Bo, Guo Xingpeng
School of Surveying & Testing, Shaanxi Railway Institute, Weinan, 714000, Shaanxi, China.
School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou, 510006, China.
Sci Rep. 2025 Jul 29;15(1):27706. doi: 10.1038/s41598-025-13057-5.
In this work, the effect of nanocrystalline cellulose (NCC) as a nanofiller on the corrosion protection of epoxy resin coatings was examined. To solve problems like poor solvent swelling resistance and micropore formation during the solidification and shrinkage of epoxy resin coatings, NCC was modified with a silane coupling agent. Alkyl chains and active amine groups were grafted onto its surface, improving the dispersibility of NCC in organic solvents and its bonding with epoxy resin. In this study, NCC was modified by hexadecyltrimethoxysilane (HDTMS) and 3-aminopropyltrimethoxysilane (APTMS), and the modified NCC (M-NCC) was added to epoxy resin E-44 through dip-coating and spraying to prepare M-NCC/EP coatings. The experiments showed that more M-NCC significantly enhanced the solvent resistance of the coatings, reducing swelling and peeling in ethyl acetate and N, N-dimethylformamide (DMF). The impedance changes of different M-NCC/EP coatings after hot/cold cycles in 3.5% NaCl solution and air were monitored by electrochemical impedance spectroscopy. It was found that at 1% and 3% M-NCC doping, the impedance remained high after 60 hot/cold cycles in sodium chloride solution and air, indicating excellent protection for carbon steel. The low thermal expansion coefficient of NCC and its bond with epoxy resin reduced the internal stress during hot/cold cycles. Also, the hydrophobicity of the coating and the filled M-NCC blocked the invasion of corrosive media. This study offers new ideas and methods for making high-performance metal protective coatings and has significant application value.
在本工作中，研究了纳米晶纤维素（NCC）作为纳米填料对环氧树脂涂层防腐性能的影响。为解决环氧树脂涂层固化和收缩过程中耐溶剂溶胀性差和形成微孔等问题，用硅烷偶联剂对NCC进行了改性。烷基链和活性胺基团接枝到其表面，提高了NCC在有机溶剂中的分散性及其与环氧树脂的结合力。在本研究中，用十六烷基三甲氧基硅烷（HDTMS）和3-氨丙基三甲氧基硅烷（APTMS）对NCC进行改性，并通过浸涂和喷涂将改性后的NCC（M-NCC）添加到环氧树脂E-44中，制备了M-NCC/EP涂层。实验表明，更多的M-NCC显著提高了涂层的耐溶剂性，减少了在乙酸乙酯和N，N-二甲基甲酰胺（DMF）中的溶胀和剥离。通过电化学阻抗谱监测了不同M-NCC/EP涂层在3.5%NaCl溶液和空气中进行热/冷循环后的阻抗变化。发现在1%和3%的M-NCC掺杂量下，在氯化钠溶液和空气中经过60次热/冷循环后阻抗仍然很高，表明对碳钢有优异的保护作用。NCC的低热膨胀系数及其与环氧树脂的结合减少了热/冷循环过程中的内应力。此外，涂层的疏水性和填充的M-NCC阻止了腐蚀性介质的侵入。本研究为制备高性能金属防护涂层提供了新的思路和方法，具有重要的应用价值。
