Predicting the exterior durability of new fluoropolymer coatings

Wood, Kurt A.; Cypcar, Christopher C.; Hedhli, Lotfi

doi:10.1016/s0022-1139(00)00228-1

Cited by 32 publications

(22 citation statements)

References 8 publications

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“…This result is also consistent with the results of earlier annealing experiments, reported in Ref. [5], in which films made from fluoropolymer core-acrylic shell latex particles were annealed at progressively higher temperatures. In that study, the QUV mass loss, and the gloss retention, improved dramatically for films annealed at temperatures at or above the fluoropolymer crystalline melting temperature, where the miscible polymers could interdiffuse.…”

Section: Resultssupporting

confidence: 93%

“…In recent studies of some waterborne coatings we have observed a rapid mass loss at the beginning of QUV-B exposure, followed by a period of relative stabilization [5]. Therefore, we focused our attention on this exposure period, which has also been reported in the literature as 'accelerated exposure' or 'degradation'.…”

Section: Resultsmentioning

confidence: 97%

“…The 2-stage EP process generates latex dispersion particles where every particle contains both the fluoropolymer and acrylic components [5]; the structure of the particles can vary between core-shell and homogeneous. For the EP dispersions used in these studies, the morphology is believed to be substantially homogeneous, based on a number of lines of evidence, not reported here, including NMR double resonance experiments.…”

Section: Methodsmentioning

confidence: 99%

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Effect of microstructure of fluorinated acrylic coatings on UV degradation testing

Sung¹,

Vicini²,

Ho³

et al. 2004

Polymer

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Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 97%

Section: Methodsmentioning

confidence: 99%

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Effect of microstructure of fluorinated acrylic coatings on UV degradation testing

Sung¹,

Vicini²,

Ho³

et al. 2004

Polymer

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“…Unlike thermoset clear coats, where it is easy to use vibrational spectroscopy to track photochemical changes leading to catastrophic network failure, observable chemical changes in thermoplastic coatings can be more modest, because of mechanisms like surface erosion which remove degraded material from the surface of the specimen. 3 By using microscopic techniques like LSCM and atomic force microscopy (AFM), however, the physical changes in the coating can be probed directly. As a first step in this quest to be able to predict weatherability from early tests, in this article we compare unweathered coatings with moderately weathered coatings-coatings which are just at the half way point for gloss retention, after about 10-12 years of Florida exposure.…”

mentioning

confidence: 99%

Relating gloss loss to topographical features of a PVDF coating

Faucheu

Wood

Sung

et al. 2006

J Coat. Technol. Res.

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Semi-gloss commercial poly(vinylidene fluoride) (PVDF) coatings typically have 60° gloss values between 20 and 50.Gloss is affected by PVDF crystallite structures and by the pigmentation. In this article, we have demonstrated that for some pigmented PVDF coatings, after 10 years of Florida exposure, the principal proximal cause of gloss changes is the formation of micron-scale pits, rather than the emergence of pigment particles at the coating surface. We have used laser scanning confocal microscopy (LSCM) and light scattering to characterize the surface topography and near-surface structure of weathered and unweathered PVDF coatings. Florida-weathered PVDF coatings show only a modest increase in the root mean square (RMS) roughness of the surface, even when noticeable gloss loss has occurred. Changes in gloss can be correlated with surface roughness and other topographical features, including the formation of pits and the emergence of pigments.

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“…For example, it would take 8-12 months of NEA in Lhasa before it had a measurable loss of gloss. 9 Table II shows that the coating film surface would start to lose its gloss after a long time under NEA in Lhasa. This results mainly from the corrosion, degradation, Figure 5 Gloss (G) of white films as a function of the natural-exposure time (t) in Lhasa.…”

Section: Comparison Of Accelerated Uv Aging With Neamentioning

confidence: 99%

Gloss and degradation of hydroxyl polyacrylic resin/hexamethylene‐1,6‐diisocyanate coatings under ultraviolet and natural‐exposure aging

Liu

2007

J of Applied Polymer Sci

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Reactive coatings of hydroxyl polyacrylic resin (HPAR) with hexamethylene-1,6-diisocyanate were carried out under accelerated 313-nm ultraviolet (UV) aging for 2000 h and under natural exposure in Lhasa, Tibet, for 24 months. With UV irradiation and exposure time, the gloss changes in coatings with HPAR containing 3.0% or less hydroxyl groups decreased exponentially, whereas the gloss decay of coatings with HPAR containing over 4.5% hydroxyl groups decreased linearly. During 254-nm UV aging, the gloss changes in coatings with HPAR containing 1.4% or less hydroxyl groups decreased as a Gaussian function. The weather resistance of a coating was correlated to the HPAR, UV irradiation, temperature, and humidity. Scanning electron microscopy indicated that there were degradation reactions and that some substance was lost in the matrix polymer during accelerated UV aging; then, uneven surfaces appeared and caused decreased gloss. Accelerated UV aging was faster than naturalexposure aging, and the aging velocity of 254-nm UV was 3-5 times faster than that of 313-nm UV. Through the changes in the gloss, the aging tolerance of a coating could be monitored, and its aging resistance could also be predicted. The dynamic mechanical thermal analysis results showed that the coatings had good properties.

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Predicting the exterior durability of new fluoropolymer coatings

Cited by 32 publications

References 8 publications

Effect of microstructure of fluorinated acrylic coatings on UV degradation testing

Effect of microstructure of fluorinated acrylic coatings on UV degradation testing

Relating gloss loss to topographical features of a PVDF coating

Gloss and degradation of hydroxyl polyacrylic resin/hexamethylene‐1,6‐diisocyanate coatings under ultraviolet and natural‐exposure aging

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