Self healing coatings containing dual active agent loaded urea formaldehyde (UF) microcapsules

Siva, T.; Sathiyanarayanan, S.

doi:10.1016/j.porgcoat.2015.01.010

Cited by 108 publications

(38 citation statements)

References 52 publications

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“…The R po and R ct shifted higher from 143.9 and 210.7 kΩ cm 2 to 204 and 290 kΩ cm 2 , respectively, after two days of immersion. This would be due to the breakage of the microcapsules surrounding the scratched region and release of the linseed oil which has a solidification attitude on the scratched region [60]. The R po and R ct values continue their increase on the third day reaching to 231.9 and 401.2 kΩ cm 2 as seen in Table 2, due to the inhibition activity of linseed oil [61].…”

Section: Resultsmentioning

confidence: 99%

Self-Healing Performance of Multifunctional Polymeric Smart Coatings

et al. 2019

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Multifunctional nanocomposite coatings were synthesized by reinforcing a polymeric matrix with halloysite nanotubes (HNTs) loaded with corrosion inhibitor (NaNO3) and urea formaldehyde microcapsules (UFMCs) encapsulated with a self-healing agent (linseed oil (LO)). The developed polymeric nanocomposite coatings were applied on the polished mild steel substrate using the doctor’s blade technique. The structural (FTIR, XPS) and thermogravimetric (TGA) analyses reveal the loading of HNTs with NaNO3 and encapsulation of UFMCs with linseed oil. It was observed that self-release of the inhibitor from HNTs in response to pH change was a time dependent process. Nanocomposite coatings demonstrate decent self-healing effects in response to the external controlled mechanical damage. Electrochemical impedance spectroscopic analysis (EIS) indicates promising anticorrosive performance of novel nanocomposite coatings. Observed corrosion resistance of the developed smart coatings may be attributed to the efficient release of inhibitor and self-healing agent in response to the external stimuli. Polymeric nanocomposite coatings modified with multifunctional species may offer suitable corrosion protection of steel in the oil and gas industry.

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Section: Resultsmentioning

confidence: 99%

Self-Healing Performance of Multifunctional Polymeric Smart Coatings

et al. 2019

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“…The magnified SEM of thermochromic microcapsules displayed the surface of UF shell material and the broken shell- core structure. The UF prepolymer was dissolved in water and then polycondensation reaction formed UF polymers as the pH value of solution adjusted to acid 23 , 24 . The reaction of UF prepolymer at the thermochromic compounds interface formed the capsule shell, and the surface of microcapsules gradually became coarse and it was covered with granular deposits as the reaction going on.…”

Section: Resultsmentioning

confidence: 99%

Thermochromic microcapsules with highly transparent shells obtained through in-situ polymerization of urea formaldehyde around thermochromic cores for smart wood coatings

Zhu

Liu

et al. 2018

Sci Rep

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In this paper, thermochromic microcapsules were synthesized in situ polymerization with urea formaldehyde as shell material and thermochromic compounds as core material. The effects of emulsifying agent and conditions on surface morphology and particle size of microcapsules were studied. It was found that the size and surface morphology of microcapsules were strongly depending on stirring rate and the ratio of core to shell. The stable and small size spherical microcapsules with excellent transparency can be obtained at an emulsifying agent to core to shell ratio as 1:5:7.5 under mechanical stirring at 12 krpm for 15 min. Finally, the thermochromic property was discussed by loading microcapsules in wood and wood coatings. Results indicate that microcapsules can realize the thermochromic property while incorporated with wood and coatings, and could have high potential in smart material fabrication.

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“…The application of the self-repair technology of the microcapsule to a coating surface can avoid a complicated artificial repair when the coating surface is damaged and cracked, and thus, the life of the coating can be improved and the useful period is prolonged [3]. A microencapsulation self-repairing technology has very broad application prospects in wood coat-ings [4], pigments, textile printing, and dyeing, as well as architectural, aerospace, and ship coatings [5]. Through the microencapsulation technology, the anticorrosion, antifouling, heat insulation, and flame retardant functions of coatings were enhanced according to requirements and the application scope of the coating was broadened.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Self-Repairing Properties of Urea Formaldehyde-Coated Epoxy Resin Microcapsules

Yan

Chang

Qian

2019

International Journal of Polymer Science

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Urea formaldehyde resin-coated epoxy resin microcapsules were prepared by two-step in situ polymerization. The effects of five factors on the yield, coverage rate, repair rate, and morphology of the microcapsules were investigated by five factors and four levels of orthogonal test. These five factors were the mass ratio of the core to the wall material (Wcore:Wwall), the mass ratio of the emulsifier to the core material (Wemulsifier:Wcore), stirring rate, deposition time, and mass ratio of the emulsifier solution to the core material (Wemulsifier solution:Wcore). The ideal technological level of microcapsule synthesis was determined. According to the results of the range and variance of yield, coverage rate, and repair rate, the comprehensive properties of microcapsules became ideal. At this time, the Wcore:Wwall was 0.8 : 1, Wemulsifier:Wcore was 1 : 100, stirring rate was 600 r/min, deposition time was 32 h, and Wemulsifier solution:Wcore was 8 : 1. When the concentration of microcapsules in the epoxy resin was 10.0%, the self-repair rate was the best and the repair rate was 114.77%. This study is expected to provide a reference value for the preparation of a microcapsule self-healing technology and lay a foundation for the subsequent development of self-healing materials.

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Self healing coatings containing dual active agent loaded urea formaldehyde (UF) microcapsules

Cited by 108 publications

References 52 publications

Self-Healing Performance of Multifunctional Polymeric Smart Coatings

Self-Healing Performance of Multifunctional Polymeric Smart Coatings

Thermochromic microcapsules with highly transparent shells obtained through in-situ polymerization of urea formaldehyde around thermochromic cores for smart wood coatings

Preparation and Self-Repairing Properties of Urea Formaldehyde-Coated Epoxy Resin Microcapsules

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