缓蚀剂植入型纳米容器多重响应释放机制及其对涂层的自修复机理研究

Halloysite nanotubes were used as corrosion inhibitor nano container in this program. The multiple responsive nano container with high storage capacity was achieved by implanting inhibitors into the polyelectrolyte layers with chloride ion, temperature and pH response inside and outside the halloysite nano tube using ion exchange adsorption and layer by layer self-assembly technology, and the response mechanism of the nano container to chloride ion, temperature and pH was explored. Then, the regulation mechanism of structure and performance for the high storage and multiple responsive nano container, will be elucidated. Moreover, the nano container loaded with inhibitors was dispersed into the epoxy matrix to obtain a multiple responsive functional composite coating, and the self-healing mechanism of this coating will also be investigated. This project can not only provide a new method and basic data for the construction of long life self-healing anticorrosion coating, but also can reveal the response mechanism and self-healing mechanism. Therefore, this project has important practical value and theoretical significance.

本研究选用埃洛石纳米管为缓蚀剂纳米容器，采用离子交换吸附和层-层自组装技术将缓蚀剂分别植入到埃洛石纳米管内腔与管外部具有温度与pH响应的聚电解质层间，得到一种具有高储存能力和多重响应机制的纳米容器，探究此纳米容器对氯离子、温度以及pH的响应机制，提出高储存、多重响应纳米容器的结构性能调控机制；在上述研究的基础上，将负载有缓蚀剂的纳米容器分散到环氧基体中，获得具有多重响应的功能性复合涂层，并探明此复合涂层的自修复机理。本项目研究不仅为构建面向长寿命的自修复防腐涂层提供新方法和基础数据，而且可望揭示缓蚀剂植入型纳米容器对环境的响应机制及其对涂层的自修复机理。因此，具有重要的实际价值和理论意义。

“自修复”防腐涂层的研究已成为新的防腐技术，然而基于植入不同响应机制的纳米容器的设计、长期稳定性、缓释机理以及不同时期的修复机理仍未研究清楚。对于缓蚀剂纳米容器设计构建的研究方面，本项目选取了埃洛石纳米管为纳米容器，苯并咪唑为缓蚀剂，通过真空吸附以及层层自组装技术分别将缓蚀剂苯并咪唑植入到埃洛石内腔与外表面具有温敏性以及pH响应性质的聚电解质层间，完成了缓蚀剂在纳米容器中的双重植入构建，提高了纳米容器对缓蚀剂的负载量，也实现了纳米容器对pH与温度的双重响应。针对缓蚀剂纳米容器外界响应机制方面的研究，我们解析了埃洛石纳米容器的结构，揭示了埃洛石纳米容器对缓蚀剂的负载机制与外表面的组装方式，阐明了缓蚀剂纳米容器的响应释放机理。同时研究了纳米容器在涂层中的防腐性能，以及缓蚀剂在金属表面吸附机理的研究。本项目研究不仅为构建面向长寿命的自修复防腐涂层提供新方法和基础数据，而且可望揭示缓蚀剂植入型纳米容器对环境的响应机制及其对涂层的自修复机理。