Curing behavior and physical properties of cured films in high solids coatings based on hexamethoxymethyl-melamine

Nakamichi, T.

doi:10.1016/0033-0655(86)80014-0

Cited by 20 publications

(2 citation statements)

References 29 publications

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“…Direct time-resolved measurement of mechanical properties was initially developed using an oscillating plate rheometer fitted with a quartz parallel plate system. , Upon UV irradiation, the dynamic viscosity of these photocurable compositions was seen to increase via the changes in the phase angle and amplitude of oscillation. However, measurements were limited to films/coatings of approximately 10 μm thickness.…”

Section: Introductionmentioning

confidence: 99%

Polymerization and Network Formation of UV-Curable Systems Monitored by Hyphenated Real-Time Dynamic Mechanical Analysis and Near-Infrared Spectroscopy

et al. 2004

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Hyphenated rapid real-time dynamic mechanical analysis (RT-DMA) and time-resolved nearinfrared spectroscopy (RT-NIRS) have allowed simultaneous monitoring of acrylate photopolymerizations with regard to both their chemical conversion and mechanical properties. Up to 374 NIR spectra and up to 50 DMA data points can be accumulated within a second. We observe that modulus buildup does not linearly follow chemical conversion of acrylate bonds. The gel point is detected after passing a certain critical acrylate conversion. Beyond the gel point (determined when the phase angle drops below 45°) network formation proceeds exponentially with acrylate conversion. Experimental data reveal a critical dependence of the mechanical property development during the later stage of acrylate conversion. The experimental results across the modulus-conversion plot reveal the importance of final acrylate bond conversion as opposed to the early part of the conversion vs time (maximum rate of polymerization R p) when considering the rate of development of mechanical properties (cure speed).

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Section: Introductionmentioning

confidence: 99%

Polymerization and Network Formation of UV-Curable Systems Monitored by Hyphenated Real-Time Dynamic Mechanical Analysis and Near-Infrared Spectroscopy

et al. 2004

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“…A liquid-applied, thermal-cured, acrylic−melamine thermoset coating, which is used as a topcoat in the automotive industry, was chosen as a model system for this work. The cross-linking kinetics and network formation in this system have been extensively studied. − However, except for a brief mention by Wicks et al, wrinkling behavior in such coatings has not been discussed in the literature. The formulation contained a hydroxyl functional acrylic oligomer, a hexafunctional melamine cross-linker, an amine-blocked acid catalyst, and a solvent.…”

Section: Introductionmentioning

confidence: 99%

Modeling the Depthwise Gradient in Curing and Skin Formation in Wrinkling Coatings

Basu¹,

Chung²,

Francis³

et al. 2007

Ind. Eng. Chem. Res.

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A theoretical model of solidification of a thermoset coating was constructed to examine the effects of a depthwise gradient in curing and skin formation on the coating's wrinkling behavior. The effects of coating thickness and catalyst concentration on the wrinkle wavelength of an acrylic-melamine coating were investigated with the model and mechanical profilometry. The model predicted that thin coatings with low and high catalyst concentrations gel quickly from top downward. Such coatings therefore have little time for the liquid below to diffuse into the already gelled skin to produce enough compressive stress to wrinkle the skin. The predicted time for complete gelation, as well as measured wrinkle wavelength in thicker coatings, rose as coating thickness was increased and showed an optimum as catalyst concentration was raised. Although time for complete gelation does not directly correlate with the wrinkle wavelength, the match of the trends of experimentally observed and theoretically predicted behavior is evidence that the essentials have been identified and represented by the model.

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Amino Resins

2017

Organic Coatings

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Curing behavior and physical properties of cured films in high solids coatings based on hexamethoxymethyl-melamine

Cited by 20 publications

References 29 publications

Polymerization and Network Formation of UV-Curable Systems Monitored by Hyphenated Real-Time Dynamic Mechanical Analysis and Near-Infrared Spectroscopy

Polymerization and Network Formation of UV-Curable Systems Monitored by Hyphenated Real-Time Dynamic Mechanical Analysis and Near-Infrared Spectroscopy

Modeling the Depthwise Gradient in Curing and Skin Formation in Wrinkling Coatings

Amino Resins

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