Self-healing performance of an epoxy coating containing microencapsulated alkyd resin based on coconut oil

Ataei, Shahla; Khorasani, Saied Nouri; Torkaman, R.; Koochaki, Mohammad Sadegh

doi:10.1016/j.porgcoat.2018.03.024

Cited by 67 publications

(36 citation statements)

References 35 publications

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“…The corrosion resistance of single-layer coatings was increased at higher contents of particles, indicating their barrier effect. 61 Generally, the increasing capsule content in selfhealing coatings decreases their adhesion strength, total elongation bending, the value of gloss, elastic module, and tensile strength 1,29,[63][64][65] . These decreases are due to the weak interface between the capsule and polymer matrix as well as weaker mechanical properties of microcapsules (MCs) compared to the cross-linked polymeric matrix (unlike the addition of particles that improves mechanical properties of the coating).…”

Section: Effect Of Filler and Capsule Content On The Properties Of mentioning

confidence: 99%

The influence of size and healing content on the performance of extrinsic self‐healing coatings

Malekkhouyan

Neisiany

Khorasani

et al. 2020

J of Applied Polymer Sci

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Among the several approaches for the protection of metallic structures from corrosion, covering with a polymeric coating has attracted more attention due to their convenient application, cost-effective price, and the relatively benign environmental impact. However, the polymeric coatings are sensitive to mechanical/thermal shocks and aggressive environments, leading to damages in the coatings that affect their barrier performance. Self-healing polymeric coatings have introduced remarkable development by extending the service life and reducing maintenance costs, leading to a significant boost in the reliability and durability of the conventional polymeric coatings. Among the different strategies to develop self-polymeric coatings, encapsulating healing agent within micro/nanocapsules, micro/nanofibers, and microvascular systems and incorporating them within the conventional coatings have been widely acknowledged as the most applicable approach. However, several factors, such as the effect of the healing system's size and content, have a significant influence on healing performance. Therefore, this review aims to reveal the effects of healing system size and healing content on the self-healing performance in polymeric coatings through the analysis of recently published articles. K E Y W O R D S coatings, surfaces and interfaces, resins 1 | INTRODUCTION In most industries, metals are utilized due to their superior physical and mechanical properties. However, metal structures are usually affected by corrosion, wear, and erosion, which cause high financial damages. According to the World Corrosion Organization (WCO), the global annual cost of corrosion is approximately 3.1%-3.

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Section: Effect Of Filler and Capsule Content On The Properties Of mentioning

confidence: 99%

The influence of size and healing content on the performance of extrinsic self‐healing coatings

Malekkhouyan

Neisiany

Khorasani

et al. 2020

J of Applied Polymer Sci

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“…N,N 0 -dimethylformamide (DMF) and poly(styrene-co-acrylonitrile) (SAN) (185 kDa, 30 wt% acrylonitrile content) were purchased from Sigma-Aldrich and used for the encapsulation process [30]. To prepare the epoxy coatings, diglycidyl ether of bisphenol-A epoxy resin (EPON 828) and a polyaminoamide-based hardener (Merginamid A280) were purchased from Hexion and Hobum oleochemicals, respectively [32].…”

Section: Dopaminementioning

confidence: 99%

“…400 to 30 MX cm 2 for coat-NO_MCs and coat-CTRL, respectively), but still preserving very high corrosion protection of the underlying metal (being 4 orders of magnitude higher than impedance recorded for naked steel, Figure S8). The observations point out that the MC embedding process causes only a limited increase of the porosity and/or of the defects of the coating that, in turn, produce more conduction pathways into the polymer matrix and a higher water uptake [32,42].…”

Section: Underwater Self-healing Behavior Of the Control Coatingmentioning

confidence: 99%

A highly responsive healing agent for the autonomous repair of anti-corrosion coatings on wet surfaces. In operando assessment of the self-healing process

et al. 2020

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A methodology to enrich epoxy coatings of an effective self-healing feature on wet surfaces was developed as a further step on for practical corrosion protection issues. To this aim, a polyetheramine was chemically engineered by grafting catechol units and then successfully encapsulated in microcapsules (MCs) to be finally embedded into an epoxy resin deposited on steel panels. Fourier transform infrared spectroscopy (FTIR), thin-layer chromatography, and 1D and 2D nuclear magnetic resonance spectroscopy confirmed the successful polyetheramine modification by dopamine units. Different dosages of catechol-modified polyetheramine were encapsulated within poly(styrene-co-acrylonitrile) shell via electrospray method to study the influence of dopamine grafting on the healing performance. Scanning electron microscopy (SEM) analysis revealed the formation of the spherical MCs, while FTIR and TGA analyses confirmed the successful encapsulation. The highly responsive self-healing coatings were then prepared by embedding amine- and isocyanate-containing MCs (1:1 weight ratio; 3 wt% overall) as a dual-capsule system exploiting the polyurea formation as a fast healing reaction. In operando electrochemical impedance spectroscopy (EIS) tests were employed to study the underwater self-healing performance. According to the EIS results, monotonically increasing variation with time of the charge transfer resistance was correlated with a fast and effective underwater self-healing performance for the sample using 40 wt% of a catechol-modified healing agent. Such results, combined with others including SEM investigation on the underwater healed samples, point to an improved adhesion of the growing dopamine-bearing polymer to both underlying metal and epoxy edges of the scratch. Graphic abstract

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“…Mirabedini et al prepared self-healing acrylic latex coatings using novel oil-filled ethyl cellulose microcapsules with enhanced mechanical properties and healing properties of latex coating [16]. Ataei et al found that the gloss and bond strength of the coatings decreased and the flexural elongation decreased with the increase of the concentration of microcapsules in epoxy coating containing microencapsulated alkyd resin based on coconut oil [17]. These reports focused on improving the water resistance, corrosion resistance and mechanical properties of waterborne coatings, but there are few reports on the toughness enhancement of waterborne coatings [18][19][20][21][22].…”

Section: Of 14mentioning

confidence: 99%

Effect of Urea-Formaldehyde-Coated Epoxy Microcapsule Modification on Gloss, Toughness and Chromatic Distortion of Acrylic Copolymers Waterborne Coating

2019

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The modification experiment of waterborne coating was carried out by adding microcapsules. The wall material of the microcapsule was urea-formaldehyde resin and the core material of the microcapsule was epoxy resin. Core material can improve the toughness of the coating and prevent the cracking of the coating. The influences of different contents of microcapsules and the order of adding microcapsules in the coating process on the properties of gloss, color difference and toughness were studied. The results showed that the gloss of the waterborne coating decreased with the increase of microcapsule content. The color difference of coating increased first and then decreased, and when the microcapsule content was 8.0%, the color difference was the largest. The toughness of the coatings also increased first and then decreased. When the content of the microcapsule was 10.0%, the toughness of the coating was significantly enhanced. When the microcapsules with a content of 10.0% were added to the waterborne coating, under the same process, the coating gloss of microcapsules added to the primer was relatively high, and the coating gloss was the highest when the coating process was three-layer primer and two-layer topcoat. The microcapsule had little effect on the color difference of coating in different coating processes. When the coating process was three-layer primer and three-layer topcoat, the coating toughness was the best when microcapsules were added to the topcoats. This study provides a basis for industrial application of waterborne coatings to enhance their toughness.

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Self-healing performance of an epoxy coating containing microencapsulated alkyd resin based on coconut oil

Cited by 67 publications

References 35 publications

The influence of size and healing content on the performance of extrinsic self‐healing coatings

The influence of size and healing content on the performance of extrinsic self‐healing coatings

A highly responsive healing agent for the autonomous repair of anti-corrosion coatings on wet surfaces. In operando assessment of the self-healing process

Effect of Urea-Formaldehyde-Coated Epoxy Microcapsule Modification on Gloss, Toughness and Chromatic Distortion of Acrylic Copolymers Waterborne Coating

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