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Wednesday, February 19 • 4:30pm - 5:00pm
Novolak Resins in Powder Coatings - Georgia Pacific Chemicals

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This study was performed to understand the effect of a phenolic resin’s molecular weight upon the film properties of epoxy:polyester hybrid powder coatings.  Three phenolic resins with softening points of 98 - 102 °C, 108 -110 °C and 118 - 122 °C were studied.  Each resin had a free phenol content of less than 0.2%.  Differential scanning calorimetry was used to determine the activation energies of crosslinking reactions, powder collapse temperature and glass transition temperature of cured films.  Fourier transform infrared analysis was used to follow crosslinking processes as a function of catalyst concentration by monitoring the decrease of oxirane concentration at 375 °F for 30 minutes.
The relationship between phenolic molecular weight and torque experienced in the extruder will be presented. Initial results showed that phenolic modified coatings require lower temperatures to achieve torque values equivalent to a control coating, thus demonstrating potential energy savings during extrusion. Film properties of coatings cured at 375 °F for 30 minutes will be presented that show the influence of the phenolics’ molecular weight.


Peter C. Boyer

Georgia Pacific Chemicals

Wednesday February 19, 2020 4:30pm - 5:00pm
Rhythms Room III