摘要
针对严苛腐蚀环境中涂层在服役过程中易破损、开裂的问题,采用原位聚合法成功制备聚脲醛-桐油微胶囊,并将其引入环氧树脂构建自修复防腐涂层。重点探究了乳化剂类型、芯壁比、酸化终点及乳化速率等关键参数对微胶囊形貌、粒径分布的调控机制。结果表明,采用吐温-80为乳化剂、芯壁比为1.5:1、pH=3.5、乳化速度为400~600 r·min^(-1)时可获得规则球形微胶囊,其热分解温度达280℃。傅里叶变换红外光谱在1730 cm^(-1)处特征峰的出现证实了桐油的成功包封。将微胶囊掺杂至环氧树脂后,划伤试样在12 h内通过桐油的氧化交联反应实现自主修复,电化学阻抗谱测试表明,修复后涂层的低频阻抗模值(|Z|0.01 Hz)提升至1.2×10^(8)Ω·cm^(2),相比于未添加微胶囊的破损涂层其阻抗值增幅达3个数量级,涂层破损区域的修复有效阻断了腐蚀介质的渗透路径。该研究为开发兼具高效自修复特性和长效防腐性能的智能防护涂层提供了新的设计思路和技术支撑。
To address the issue of coating damage and cracking during service in harsh corrosive environments,polyurea-formaldehyde-tung oil microcapsules were successfully prepared by in-situ polymerization method and introduced into epoxy resin to construct self-healing anti-corrosion coatings.The key parameters such as emulsifier type,core-shell ratio,acidification endpoint,and emulsification rate were explored to investigate the regulatory mechanism of microcapsule morphology and particle size distribution.Results show that regular spherical microcapsules with a thermal decomposition temperature of 280℃can be obtained when using Tween-80 as the emulsifier,a core-wall ratio of 1.5﹕1,pH of 3.5,and an emulsification speed of 400~600 r·min^(-1).The characteristic peak at 1730 cm^(-1)in the Fourier transform infrared spectrum confirms the successful encapsulation of tung oil.When doped into epoxy resin,scratched samples achieve autonomous repair within 12 hours through the oxidative cross-linking of tung oil.Electrochemical impedance spectroscopy tests show that the low-frequency impedance modulus(|Z|0.01 Hz)of the repaired coating increases to 1.2×10^(8)Ω·cm^(2),three orders of magnitude higher than damaged coatings without microcapsules.The repair of the damaged area effectively blocks the penetration path of corrosive media.This study provides new design ideas and technical support for developing intelligent protective coatings with both high-efficiency self-healing capability and long-term anti-corrosion performance.
作者
邬春雷
周海刚
郑宁
李资收
曹华平
魏旭
王亭沂
WU Chunlei;ZHOU Haigang;ZHENG Ning;LI Zishou;CAO Huaping;WEI Xu;WANG Tingyi(China Petroleum and Chemical Corporation,Shengli Oilfield Branch Technical Testing Center,Dongying 257088,China;School of Materials Science and Engineering,China University of Petroleum(East China),Qingdao 266580,China;Shengli Oilfield LumingOil and Gas Exploration and Development Co.,Ltd.,Dongying 257099,China)
出处
《电镀与精饰》
北大核心
2026年第1期39-46,86,共9页
Plating & Finishing
关键词
微胶囊
自修复涂层
腐蚀与防护
microcapsules
self-healing coating
corrosion and protection
