The surface properties and corrosion resistance of fluorinated polyurethane coatings

• Fluorine migrates to the top of surface and creates a low surface energy.
• Fluorinated polyurethane showed higher contact angle versus polyurethane.
• FPU coating has outstanding anti-corrosion resistance versus PU coating.
• The lower molecular weight FPO, the FPU coatings have better water resistance.

Fluorine-containing epoxy (FO) compounds were synthesized through a one-step process from 2,2,3,3-tetrafluoro-1-propanol (TFP) and epichlorohydrin (ECH). Cationic polymerization was adopted to prepare fluorinated polyglycol with controllable molecular weight. The structure of FO and FPO were studied by FTIR, NMR and GPC and a two-component fluorinated polyurethane coating was synthesized using FPO and methyl diphenylenediisocyanate (MDI) with a room temperature curing method. We characterized the contact angle of the surface of the coating. The water resistance and resistance to salt spray as well as SEM imaging of the film surface indicates that hydrophobicity, water resistance, and corrosion resistance are improved due to surface migration of the fluorine element.

Fluorine-containing epoxy (FO) compounds were synthesized through a one-step process from 2,2,3,3-tetrafluoro-1-propanol (TFP) and epichlorohydrin (ECH). Cationic polymerization was adopted to prepare fluorinated polyglycol with controllable molecular weight. And a two-component fluorinated polyurethane coating was synthesized using FPO and methyl diphenylenediisocyanate (MDI) with a room temperature curing method. The hydrophobicity, water resistance, and corrosion resistance of coating are improved due to surface migration of the fluorine element.Figure optionsDownload as PowerPoint slide