Epoxy resinAs the three most common One of the thermosetting resins, it has good thermal stability, adhesion, excellent corrosion resistance, small shrinkage after curing, good electrical insulation, etc. It also has good mechanical properties, easy processing and molding, and low cost. Therefore, it is widely used in many fields such as building materials, electronics and aviation.
In recent years, nanotechnology has developed rapidly. Wide range of applications. Using nanomaterials to modify organic coatings can improve the aging resistance, weather resistance and light resistance of the materials. Moreover, the small size of nanoparticles can promote the cross-linking reaction during the cross-linking process of epoxy resin, enhance the density of epoxy resin, and thereby improve its anti-corrosion ability.
1. Nano-TiO2Modified epoxy resin
Nano-TiO2 has good dispersion, weather resistance and excellent surface effect. Nano-TiO2 powder has been widely used as a nano-TiO2-based material due to its good granularity. Solvent-based epoxy resin is often used for anti-corrosion, but when the solvent evaporates during the curing process, a large number of micropores will be generated, and corrosive liquids will quickly penetrate into the protected matrix through the micropores. Nano-TiO2 is added as a filler to the epoxy resin system to enhance the toughness of the epoxy resin and improve the anti-corrosion performance of the epoxy coating. In addition, adding nano-TiO2 to epoxy resin can form a dense three-dimensional network structure, which improves the hydrophobicity and density of epoxy resin and further enhances the anti-corrosion performance of epoxy resin.
Tijana et al. added gallate-modified TiO to epoxy resin2Nano particles, PreparedEP/TiO2Nanocomposites. The results show that adding surface-modified TiO2Nano particles increase the glass transition temperature of epoxy resin and reduce water vapor permeability. As the chain length of the hydrophobic part of the gallic acid ligand increases,EP/TiO2The water vapor transmission rate of nanocomposites is reduced. The nanocomposite material has better anti-corrosion properties than pure epoxy resin, mainly because of the surface-modified TiO2Nanoparticles act as oxygen scavengers and inhibit the corrosion of steel through the cathode mechanism.
2. Nano-SiO2Modified epoxy resin
NanoSiO2 is an inorganic chemical material with a spherical microstructure, flocculent and network-like quasi-granular structure, which can improve the overall performance of the material, especially anti-aging and material strength. and chemical corrosion resistance. SiO2Nanoparticles are stable, safe, and abundant materials that are easy to synthesize. For epoxy resin, NanoSiO2 “>It can promote its cross-linking reaction, improve the bonding force between molecules and surface adhesion, thereby improving the corrosion resistance of epoxy resin.
The compatibility with epoxy resin has been improved and the Fe3O4The interface defects between particles and epoxy resin improve the corrosion resistance of the composite coating.
5. Carbon nanotube modified epoxy resin
CNTs exhibit excellent performance due to their unique tubular structure Mechanical properties, electrical properties, anti-corrosion properties and mechanical properties. In recent years, CNTs have been considered as one of the most promising materials for reinforced polymer composites. CNTs are prone to agglomeration due to their large aspect ratio and the presence of a large amount of van der Waals forces between each other. Therefore, most researchers will perform surface modification on them to increase their anti-corrosion properties.
He et al. used multi-walled carbon nanotubes to be acidified by mixed acid, and used a silane coupling agent (KH560) modified mica, and used hexamethylenediamine to connect mica and multi-walled carbon nanotubes to obtain mica-multi-walled carbon nanotube composites. The results show that after adding 10% KH560, multi-walled carbon nanotubes can be well dispersed on the mica surface. Compared with mica/epoxy resin and pure epoxy resin, the impedance of mica-multiwall carbon nanotube/epoxy resin composite coating is larger.
6. Graphene modification Resin epoxy resin
Graphene has a barrier effect on water, oxygen and chloride ions, and has a large specific surface area and a special two-dimensional layered structure, which makes graphene have broad application prospects in the field of anti-corrosion. At present, graphene-modified anti-corrosion coatings have been applied in complex industrial production and marine environments, allowing the protected substrate to achieve a longer anti-corrosion life.
Zhang et al. studied the synthesis of functionalized silanes The coupling agent [2-(3,4-epoxycyclohexyl)ethyltriethoxysilane] is used to improve the surface of GO, to solve the agglomeration problem of nanomaterials, and to fill the coating to improve the epoxy resin coating. The corrosion resistance of the layer. EIS and salt spray experiments show that the addition of functionalized GO improves the anti-corrosion performance of epoxy composite materials, and when the dosage of functionalized GO is 0.7%, the composite coating shows the best anti-corrosion performance.
7. Nano-metal Zn modified epoxy resin
Adding nanometalZn to the coating can improve the density of the coating. Adding nanometal Zn to epoxy resin can improve the adhesion and penetration ability of the coating. When the coating is damaged, nanometal Zn will precipitate at the damaged location and form a protective film, thereby delaying corrosion of the coating.
Li Xuri and others made an epoxy Zn-rich anti-corrosion coating by adding nano-Zn powder to epoxy resin, and tested its corrosion resistance. EIS tests show that under the action of cathodic protection, the higher the Zn powder content, the stronger the protective ability of the coating. In the salt spray corrosion assessment, corrosion mainly occurs in the blank epoxy coating. The modified coating showed good corrosion resistance. When the mass fraction of zinc powder was added to 20%, the anti-corrosion effect of the coating was the best.
Nano powder filler modified epoxy resin is an important method to improve anti-corrosion performance . Each particle has its own unique properties. When its modified epoxy resin cannot adapt to various corrosive environments, a variety of nano-ions can be combined to synergistically modify the epoxy resin to obtain an environment suitable for different environments. Oxygen resin. How to integrate different nano-ions together to exert their synergistic effect and better improve the anti-corrosion performance of epoxy resin will be an important direction for future research.
an>Nano powder filler modified epoxy resin is an important method to improve anti-corrosion performance. Each particle has its own unique properties. When its modified epoxy resin cannot adapt to various corrosive environments, a variety of nano-ions can be combined to synergistically modify the epoxy resin to obtain an environment suitable for different environments. Oxygen resin. How to integrate different nano-ions together to exert their synergistic effect and better improve the anti-corrosion performance of epoxy resin will be an important direction for future research.
