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Monday, 16 September 2019
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Raw materials & technologies, Applications

Rheological measurement technologies to analyse waterborne paint sprayability

Friday, 17 October 2014

A research team developed a new technology to analyse and quantify the behaviour of complex fluids during spray applications.

From OEM vehicles, automotive refinish and commercial vehicles to electric motors, buildings and pipelines, Axalta's coatings prevent corrosion. Source: Axalta
From OEM vehicles, automotive refinish and commercial vehicles to electric motors, buildings and pipelines, Axalta's coatings prevent corrosion. So...

Eric Houze, Research Fellow at Axalta Coating Systems, and Bavand Keshavarz, a Ph.D. candidate from the Massachusetts Institute of Technology (MIT), presented the results of a joint research program on new rheological measurement technologies that can be applied to sprayable paints.

Improving surface quality and visual appeal

During the paint spray application process, droplet particle sizes and distributions can be determining factors for the quality and appearance of the final paint. The new technology is designed to help improve paint sprayability during the application process, which should result in an improvement in the surface quality and visual appeal. "Historically, industry researchers used high shear viscosity (HSV) or Capillary Breakup Extensional Rheometer (CBER) to assess capillary thinning and the filament formation dynamics of paint. This can often be related to the droplet formation process during paint spray application, but can be limited as a result of relatively low relaxation times observed in commercial paints,” explained Houze.

Jet-based rheometry approach

The researchers developed a jet-based rheometry approach to analyse a sample’s behaviour at very high-strain rates that can determine relaxation times of waterborne paints down to about 60 microseconds. This technique is known as Rayleigh-Ohnesorge Jetting Rheometry (ROJER).”
"Air-assisted atomisation in spraying of complex liquids is a key process in many industrial applications, but the effects of some rheological properties on the process are still poorly understood,” said Dr. Gareth McKinley, MIT School of Engineering Professor of Teaching Innovation and Associate Head for Research. "The new technologies that we developed can connect the rheological fingerprints of a material to industrial applications, such as "sprayability” of paints.”

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