Failure of navy coating systems 1: chemical depth profiling of artificially and naturally weathered high-solids aliphatic poly(ester-urethane) military coating systems

Keene, Lionel; Halada, Gary P.; Clayton, Clive R.

doi:10.1016/j.porgcoat.2004.11.004

Cited by 15 publications

(6 citation statements)

References 17 publications

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“…It is what makes them preferably used as primers or intermediate coats. Aliphatic polyurethanes can be linear or cyclic and offer better UV resistance and are used as topcoat when good weatherability is needed but are more expensive and react more slowly [1,100,113,114]. Figure 20 shows some typical chemical structure of aromatic and aliphatic isocyanates.…”

Section: Generalitiesmentioning

confidence: 99%

Powder and High-Solid Coatings as Anticorrosive Solutions for Marine and Offshore Applications? A Review

Pélissier

Thierry

2020

Coatings

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The constant change in coating technology and environmental regulations has led to the development of low-solvent to solvent-free organic coatings, such as powder and high-solid coatings. These two technologies are well developed, but are still not the preferred choice when considering anticorrosive coating for marine and offshore applications. This mostly arise from a lack of perspective in their long-term behavior and from the difficulty in their applications. This review’s principal aim is to describe powder and high-solid technologies from their formulation and application to their use in marine and offshore applications while recalling and giving key notions needed when the field of anticorrosive coatings is considered. First, the requirement for coatings to be called anticorrosive will be given alongside with their protection and failure mechanisms. The formulation and application for high-solid and powder coatings will be exposed followed by the description of the type of coating chemistry used in harsh environment. Finally, high-solid and powder coatings behavior in these types of environment will be discussed.

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Section: Generalitiesmentioning

confidence: 99%

Powder and High-Solid Coatings as Anticorrosive Solutions for Marine and Offshore Applications? A Review

Pélissier

Thierry

2020

Coatings

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“…Several changes in the spectrum are immediately obvious. Prior to exposure, the larger peak at 1684 cm −1 is attributed to hydrogen-bonded urethane carbonyl [17], and the shoulder at 1728 cm −1 indicates ester carbonyl from the polyester-polyol extender [14]. The peak at 1645 cm −1 indicates hydrogen-bonded urea [18] (resulting from the polyisocyanate form of the precursor, hexamethylene diisocyanate, which is in the form of a biuret (i.e.…”

Section: Spectroscopy Of Exposed Polyurethanes -Solvent System Dmentioning

confidence: 99%

“…While these findings offer an explanation for removal, they do not address the chemical processes which may occur within the coating during solvent exposure, thereby leading to apparent chemical degradation. Extensive studies have been undertaken concerning the degradation of military coatings by water [9], accelerated weathering [10][11][12][13][14][15], and physical aging [16]. While polyurethanes are commonly considered susceptible to phenol exposure, the specific mechanism of attack has not been elucidated.…”

Section: Introductionmentioning

confidence: 99%

Physicochemical investigation of chemical paint removers. II: Role and mechanism of phenol in the removal of polyurethane coatings

Young

Clayton

Wynne

et al. 2015

Progress in Organic Coatings

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a b s t r a c tThermal and spectroscopic techniques have been used to study the interactions of phenol with model polyurethane coatings. Previous work has pointed to phenol as the principal source of polymer degradation in methylene chloride/phenol paint stripping mixtures. Thermal analysis demonstrates that the addition of phenol leads to severe depression in T g and outright coating failure. Exposure appears to cause chain scission, leading to significant weight loss during thermal analysis. XPS confirms the deposition of methylcellulose stabilizer at the surface, but also indicates breaches in the conformal coating which we attribute to polyurethane degradation. Raman and ATR-FTIR spectroscopy confirm chemical modification of the polyurethane by phenol, leading to the proposed model of degradation by nucleophilic attack.

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“…[469][470] Aliphatic poly(ester-urethane) coatings were analyzed by chemical depth profiling. [469][470] Aliphatic poly(ester-urethane) coatings were analyzed by chemical depth profiling.…”

Section: Military Applicationsmentioning

confidence: 99%

Weathering of Compounded Products

Wypych¹

2013

Handbook of Material Weathering

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Failure of navy coating systems 1: chemical depth profiling of artificially and naturally weathered high-solids aliphatic poly(ester-urethane) military coating systems

Cited by 15 publications

References 17 publications

Powder and High-Solid Coatings as Anticorrosive Solutions for Marine and Offshore Applications? A Review

Powder and High-Solid Coatings as Anticorrosive Solutions for Marine and Offshore Applications? A Review

Physicochemical investigation of chemical paint removers. II: Role and mechanism of phenol in the removal of polyurethane coatings

Weathering of Compounded Products

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