可溶性微/纳米MQ粒子复合涂层防腐性能及失效行为研究

Micro/nano composite technology is an important means to improve the performance of anticorrosion coating. However inorganic particle such as SiO2，TiO2 is easy to agglomerate, difficult to disperse, and its interface is incompatibility with binder. These disadvantages limit the performance of anticorrosion composite coating. MQ is a kind of inorganic-organic hybrid particle consisting of inorganic Si-O-Si core and organic shell which external organic groups attaching to silicon atoms through a covalent bond. MQ particle can be dissolved in solvent and its.size is controllable from several to several hundreds of nanometer, its organic group is designable. In the project, structure controllable and particle evenly dispersing micro/nano composite coating is prepared by taking advantage of the good dissolution, controllable size and designable organic group of MQ particle. The influence of the particle size，group and surface interaction between the binder and particle on coating structure and anticorrosion properties are investigated systematically. Furthermore, the failure mechanism under seawater environment is clearly demonstrated. Consequently, the enhanced mechanism of micro/nanoparticle on coating properties is discussed and the design principle of micro/nano particle composite coating is summarized. The start-up of this project will provide experimental data and theoretical basis for the design and preparation of micro/nanocomposite anticorrosion coatings.

微/纳米复合技术是提高防腐涂层性能的重要手段，然而SiO2，TiO2等无机粒子易团聚、难分散、和成膜物界面不相容，限制了无机微/纳米复合涂层的性能。MQ是一种有机-无机杂化粒子，其内部是由Si-O-Si构成的无机结构，外部为通过共价键连接在硅原子上的有机基团，具有可溶解性、尺寸在几纳米到几百纳米范围内可控、携带的有机基团可设计等特点。本项目首先借助于有机-无机杂化MQ粒子的可溶及粒子尺寸可控、官能基团的可设计，制备结构可控、粒子均匀分散的微/纳米粒子复合涂层，系统研究粒子尺寸、官能基团及粒子和成膜物间的表面作用方式对涂层结构和防腐相关性能的影响，重点分析阐明复合涂层在海水条件中的失效机制，最终讨论微/纳米粒子增强防腐涂层性能的机理，总结微/纳米粒子复合防腐涂层的设计原则。该项目的开展将为设计、制备高效微/纳米复合防腐涂层提供实验数据和理论依据。

本项目通过M/Q摩尔比、反应过程中的参数的控制，制备出粒径尺寸不同的微/纳米MQ粒子。研究了MQ尺寸、添加量以及表面基团对MQ在环氧涂层中的分散效果及其性能的影响，探索了粒子尺寸、官能基团及粒子和成膜物间的表面作用方式对涂层结构和防腐相关性能的影响规律，阐述了复合涂层在海水条件中的失效机制，发展了微/纳米粒子增强防腐涂层性能的制备途径，为设计、制备高效微/纳米复合防腐涂层提供实验数据和理论依据