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Home  > Raw materials & technologies  > Technologies  > Waterborne coatings  > Making water unattractive to waterborne PUR

Friday, 20 September 2019
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Raw materials & technologies, Technologies, Waterborne coatings

Making water unattractive to waterborne PUR

Friday, 11 January 2013

Waterborne coatings are usually challenged with corrosion resistance as the environmental water is highly attracted to this surface. A new PUR-coating shows improved hydrophobic properties.

Gaining cationomer polyurethane coatings from the reaction of eg; isophorone diisocyanate with polyoxyethylene glycol and N-butyldiethanolamine with 2,2,3,3-tetrafluoro-1,4-butanediol
Gaining cationomer polyurethane coatings from the reaction of eg; isophorone diisocyanate with polyoxyethylene glycol and N-butyldiethanolamine wit...

Piotr Król from Rzeszów University of Technology, and other researchers from Poland synthesized a coating with polyurethane cationomers. Therefore they used the reaction of 4,4′-methylenebis(phenyl isocyanate) or isophorone diisocyanate with polyoxyethylene glycol (M = 600) and N-methyl or N-butyldiethanolamine with 2,2,3,3-tetrafluoro-1,4-butanediol.

After the application the investigated the phase structure of the coatings with AFM method.

Then they had a closer look to the surface-free energy (SFE). This was calculated independently according to the method suggested by van Owens–Wendt, in relation to chemical structures of cationomers, as well as morphology of coating surfaces obtained from those cationomers.

Lower SFE with fluorine

Fluorine incorporated into cationomers (about 2–5 %) contributed to lower SFE values, down to about 30 mJ/m2.

The researchers made an attempt to use 1H-NMR spectroscopy to provide more extensive grounds for the effect of polyurethane chemical structures (by parameters κ) on the SFE of coatings obtained from such polyurethanes, with the values of SFE (γS, γmath image) and determined by the Owens–Wendt method.

This research will be published in February in the Journal of Applied Polymer Science, Volume 127, Issue 4, pages 2508–2519.

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