Abstract
Isocyanate-terminated prepolymer was prepared by reaction of polyether polyols with toluene diisocynate and was modified by adding CaO, hydroxyl silicone oil and hexamethylene diisocyanate, then solvent-free heavy-duty PU coating was got. The curing process of coating was studied by infrared spectrum. Physical, chemical and electrochemical properties of the coating were tested. The results showed that the coating could finish curing in 20 h at room temperature and its adhesion on the substrate of rusted carbon steel was 11.22 MPa. There was no rust change when the salt fog resistance reached 2200 h, the open-circuit potential electrode of coating showed the anticorrosion mechanism of it was given priority to shielding, linear polarization resistance of it exceeded 220 kΩcm2. All the above showed that solvent-free heavy-duty polyurethane coating had excellent anti-corrosion performance.
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