Preparation and Properties of Self-Healing and Self-Lubricating Epoxy Coatings with Polyurethane Microcapsules Containing Bifunctional Linseed Oil
| Autor: | Gu Fengmei, Weizhou Li, Yang Haijuan, Mo Qiufeng |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Polymers and Plastics engineering.material Article Corrosion lcsh:QD241-441 chemistry.chemical_compound Coating lcsh:Organic chemistry Salt spray test self-healing self-lubricating Composite material Bifunctional Polyurethane coating General Chemistry Epoxy linseed oil Interfacial polymerization Dielectric spectroscopy microcapsules chemistry visual_art visual_art.visual_art_medium engineering |
| Zdroj: | Polymers Volume 11 Issue 10 Polymers, Vol 11, Iss 10, p 1578 (2019) |
| ISSN: | 2073-4360 |
| DOI: | 10.3390/polym11101578 |
| Popis: | An organic coating is commonly used to protect metal from corrosion, but it is prone to failure due to microcracks generated by internal stress and external mechanical action. The self-healing and self-lubricating achieved in the coating is novel, which allows an extension of life by providing resistance to damage and repair after damage. In this study, a new approach to microencapsulating bifunctional linseed oil with polyurethane shell by interfacial polymerization. Moreover, the self-healing and self-lubricating coatings with different concentrations of microcapsules were developed. The well-dispersed microcapsules showed a regular spherical morphology with an average diameter of ~64.9 &mu m and a core content of 74.0 wt.%. The results of the salt spray test demonstrated that coatings containing microcapsules still possess anticorrosion, which is improved with the increase of microcapsules content, after being scratched. The results of electrochemical impedance spectroscopy showed a |Z|f=0.01Hz value of 104 &Omega · cm2 for pure epoxy coating after being immersed for 3 days, whereas the coating with 20 wt.% microcapsules was the highest, 1010 &Omega cm2. The results of friction wear showed that the tribological performance of the coating was enhanced greatly as microcapsule concentration reached 10 wt.% or more, which showed a 86.8% or more reduction in the friction coefficient compared to the pure epoxy coating. These results indicated that the coatings containing microcapsules exhibited excellent self-healing and self-lubricating properties, which are positively correlated with microcapsules content. |
| Databáze: | OpenAIRE |
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