a fe 2+ Metal-organic framework corrosion inhibitor-hydrogel composite with responsive properties and its preparation method and application

Abstract

The invention discloses a 2+ Responsive metal-organic framework corrosion inhibitor-hydrogel composite and its preparation method and application, the composite is composed of polyvinyl alcohol hydrogel and thiourea corrosion inhibitor encapsulated in the hydrogel Copper-based carboxylate metal-organic framework. First, the in situ encapsulation of the corrosion inhibitor guest in the metal-organic framework assembly solution was realized by a one-pot synthesis method, and then the encapsulation precursor was doped into the polyvinyl alcohol hydrogel, and the hydrogel monomer and the metal-organic framework The coordination effect of the metal center in the nanoshell can delay the growth rate of the nanoshell, thereby improving the integrity of the framework structure, and finally realizing the high-capacity encapsulation of the corrosion inhibitor, forming a water solution with a high loading of the metal-organic framework encapsulating the corrosion inhibitor. Gel complex. The corrosion inhibition compound can be applied to seawater corrosion engineering structures, because the main characteristic product of carbon steel corrosion in seawater environment is free ferrous ions, which pass through the hexadecyltrimethylammonium cation center of the metal organic framework The replacement can expand the outer aperture of the frame to release the corrosion inhibitor encapsulated inside, and realize the targeted protection of the corrosion area. Adopting the corrosion inhibition system of the present invention has strong targeting, high efficiency and durability, high cost performance, and has remarkable application value and broad market prospect.

Description

technical field [0001] The invention relates to the technical field of marine iron and steel anticorrosion coating materials, more specifically, a 2+ Metal-organic framework corrosion inhibitor-hydrogel composites with responsive properties, their preparation methods and applications. Background technique [0002] With the development and utilization of marine resources, the amount of steel used in various large-scale marine components and shipbuilding steel has increased significantly, and the corrosion of steel materials in the marine environment has become an increasingly concerned issue. Due to its low price and good processing performance, carbon steel is the most widely used material in marine engineering. However, carbon steel is a kind of multi-metal alloy material. When the material is immersed in seawater medium, the potential difference between the metals will cause the galvanic current to flow between the metals, resulting in the protection of the metal with a r...

AI Technical Summary

Problems solved by technology

[0004] Although the use of nano-microcapsules to encapsulate corrosion inhibitors to achieve controllable release of target molecules has been widely reported, most of them are limited to doping microcapsules in brittle coatings such as epoxy resins, which are easily damaged by various stresses.

At the same time, the corrosion inhibition effect of this type of coating system is usually based on the release of the corrosion inhibitor from the microcapsules due to the stress cracking of the coating. However, the corrosion inhibitor itself has poor compatibility with epoxy resin and cannot diffuse well into the corrosion source. point of origin protection

On the other hand, the dispersibility of microcapsules in coatings such as epoxy resin also greatly limits its corrosion inhibition performance.

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