Submitted to: Annual Meeting and Expo of the American Oil Chemists' Society
Publication Type: Abstract Only
Publication Acceptance Date: 5/3/2006
Publication Date: 5/3/2006
Citation: Kenar, J.A., Kurth, T., Felker, F.C., Biresaw, G. 2006. Sprayable water-based dry film lubricants from starch-oil composites [abstract]. Annual Meeting and Expo of the American Oil Chemists' Society. p. 76.
Technical Abstract: Recent technology developed at NCAUR can be used to produce highly stable aqueous starch-oil composites from abundant renewable resources by excess steam jet-cooking an aqueous slurry of starch and vegetable oils or other hydrophobic materials. The resulting aqueous starch oil composites typically contain up to 40 wt % oil relative to starch weight, consist of uniformly suspended starch-coated oil droplets (1-10 micrometers in diameter), can be drum dried and milled into powder form, easily transported, and reconstituted by dispersing the powder into water with mechanical mixing. Starch oil composites that varied in starch type (waxy maize or normal unmodified food grade cornstarch) and oil (soybean oil, jojoba oil, hexadecane) proportions were prepared and investigated as water-based dry film lubricants. The aqueous composite formulations were sprayed onto metal surfaces, dried quickly (important for commercialization), leaving a thin coating of the starch oil composite on the metal surface. Coefficient of friction (COF) measurements of the various composite formulations using ball-on-flat test geometry has shown the COF to be independent of the starch type used and depend mainly on the starch-to-oil ratio. It was observed that metal coated with certain starch-oil composites displayed lower COF than metal coated with soybean oil alone. This presentation will discuss recent experimental results and potential mechanisms by which the starch-oil composites operate.