Tannin-based inhibitive pigment for sustainable epoxy coatings formulation

Lamprakou, Zoi; Bi, Huichao; Weinell, Claus Erik; Dam‐Johansen, Kim

doi:10.1016/j.porgcoat.2022.106841

Cited by 13 publications

(13 citation statements)

References 37 publications

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“…Calcium phosphate (Heubach, GmbH) was used as an inhibitive pigment in both groups. The main characteristic properties of the calcium phosphate used are listed in Table …”

Section: Methodsmentioning

confidence: 99%

“…The main characteristic properties of the calcium phosphate used are listed in Table 1. 42 The procedure followed for the synthesis and the loading of the MSN particles with calcium phosphate was the same as presented in our previous study. 38 A standard sol−gel method was used for the synthesis of the MSN particles, with hexadecyltrimethylammonium bromide (CTAB) employed as the surfactant and tetraethyl orthosilicate (TEOS) as the precursor in the process.…”

Section: Coating Formulation and Coated Panel Preparationmentioning

confidence: 99%

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Encapsulated Corrosion Inhibitive Pigment for Smart Epoxy Coating Development: An Investigation of Leaching Behavior of Inhibitive Ions

Lamprakou

Weinell

et al. 2023

ACS Omega

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A comparative study between the leaching behavior of inhibitive ions from conventionally pigmented and smart (with encapsulated pigments) epoxy coatings has been conducted. Leaching of calcium phosphate as an inhibitive pigment from epoxy coatings was tested in 3.5 wt % NaCl solution. The results showed that pigment encapsulation contributed to a more uniform and stable coating microstructure based on the Scanning Electron Microscopy–Energy-Dispersive X-ray Spectroscopy (SEM-EDX) analysis and a higher leaching rate of the inhibitive pigment via the Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES) analysis, thereby enhancing both the active corrosion protection and the barrier properties of the coating film. This was further verified by the Electrochemical Impedance Spectroscopy (EIS) measurements. After 7 days of immersion in 3.5 wt % NaCl solution, the coating resistance of the smart epoxy coating with mesoporous silica nanoparticle encapsulated calcium phosphate (MSN-CP3%) was 2 × 109 Ω·cm2 compared to 1.1 × 106 Ω·cm2 and 2.6 × 106 Ω·cm2 for the conventional epoxy coatings pigmented with 3 wt % and 5 wt % calcium phosphate (CP3% and CP5%), respectively.

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“…Calcium phosphate (Heubach, GmbH) was used as an inhibitive pigment in both groups. The main characteristic properties of the calcium phosphate used are listed in Table …”

Section: Methodsmentioning

confidence: 99%

Section: Coating Formulation and Coated Panel Preparationmentioning

confidence: 99%

Encapsulated Corrosion Inhibitive Pigment for Smart Epoxy Coating Development: An Investigation of Leaching Behavior of Inhibitive Ions

Lamprakou

Weinell

et al. 2023

ACS Omega

Self Cite

View full text Add to dashboard Cite

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“…This leads to its widespread use in molding compounds, microelectronic materials, coatings, and other applications. [1][2][3][4][5] Unfortunately, the flammability of general epoxy resin products limits its further application in areas where flame retardancy is required, especially in aerospace, electronics, construction, and so forth. 6 Therefore, halogen-containing flame retardants were commonly used to enhance the flame retardancy of epoxy resins.…”

Section: Introductionmentioning

confidence: 99%

“…Epoxy resin (EP) is a thermosetting resin with superior chemical and solvent resistance, good electrical insulation and dimensional stability, and favorable mechanical processability. This leads to its widespread use in molding compounds, microelectronic materials, coatings, and other applications 1–5 . Unfortunately, the flammability of general epoxy resin products limits its further application in areas where flame retardancy is required, especially in aerospace, electronics, construction, and so forth 6 .…”

Section: Introductionmentioning

confidence: 99%

A vanillin derivative P/N/S‐containing high‐efficiency flame retardant for epoxy resin

Zhang

Huang

et al. 2022

J of Applied Polymer Sci

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In order to improve the flame‐retardant properties of epoxy resin (EP) without sacrificing the mechanical properties, a high‐efficient P/N/S‐containing reactive flame retardant (VTZD) was synthesized by a facile one‐pot method from vanillin, 2‐aminobenzothiazole and 9,10‐dihydro‐9‐oxa‐10‐phosphaphenanthrene‐10‐oxide (DOPO), and used in epoxy‐amine thermosets. When 5 wt% of VTZD was added with merely 0.31 wt% of phosphorus, the LOI value of cured resins increased to 32.7%, and the thermosets achieved a UL‐94 V‐0 rating. Furthermore, the peak heat release rate and the total heat release of the VTZD‐modified EP decreased by up to 34.66% and 32.49%, respectively, in comparison to those of the original EP. Subsequently, the residual char morphology and structure of epoxy thermosets were investigated, as well as the pyrolysis behavior of VTZD. The flame‐retardant mechanism was discussed in detail, and it confirmed that VTZD exhibited a bi‐phase flame retardant effect. In addition, the mechanical properties of the cured products were well maintained and even improved. All the results demonstrated that the VTZD was a bio‐based high‐efficiency flame retardant for EP with a broad prospect in practical applications.

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“…Epoxy resin can be used as the matrix of kinds of high‐performance composites, 1,2 adhesives 3 and paints 4,5 . The versatility comes from the highly crosslinked structure of epoxy resin, which provides good mechanical properties, dimensional stability and solvent resistance.…”

Section: Introductionmentioning

confidence: 99%

Improving toughness of epoxy resin by in‐situ formed secondary network during tertiary amine initiated curing

Tian

Zhao

Liu

2022

J of Applied Polymer Sci

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The mechanical properties of epoxy resin cured by tertiary amine initiated ring‐open reaction were investigated. Special curing procedures that first at 130°C for different times (facilitating chain transfer/reducing crosslinking density) and then 80°C/2 h–130°C/2 h were used. For cured specimens, the glass transition temperature showed a continuous decrease with increasing time at the first step of curing (t1st step), and the swelling ratio also increased. These changes pointed to a monotonic decrease in crosslinking density. Mechanical properties were characterized by three‐point bending and tensile test. Both the deflection and strain at break showed a sudden increase when t1st step reached 30 min, corresponding well to occurrence of gelation at 130°C. The fracture surface after tensile test was further examined. Rough surface with rupture of fibrillar structure was found when t1st step reached 30 min. These observations all suggest an abrupt increase of toughness related to gelation (t1st step = 30 min). It is explained by formation of network at the first step of curing, which has lower crosslinking density and serves as a secondary toughening network.

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Tannin-based inhibitive pigment for sustainable epoxy coatings formulation

Cited by 13 publications

References 37 publications

Encapsulated Corrosion Inhibitive Pigment for Smart Epoxy Coating Development: An Investigation of Leaching Behavior of Inhibitive Ions

Encapsulated Corrosion Inhibitive Pigment for Smart Epoxy Coating Development: An Investigation of Leaching Behavior of Inhibitive Ions

A vanillin derivative P/N/S‐containing high‐efficiency flame retardant for epoxy resin

Improving toughness of epoxy resin by in‐situ formed secondary network during tertiary amine initiated curing

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