Abstract
Protective and reinforced one coating systems for steel were prepared from polyurethane (PU) and red iron oxide (RIO) pigment. Two PU resins (COPU and PEGPU) based on castor oil (CO) and polyethylene glycol 1000 (PEG1000), respectively, were prepared with a highly functional structural backbone that could enable them to protect steel surface from corrosion. The preparation process passed through a polyol and a prepolymer synthesis. COPU, PEGPU, and the prepolymer were characterized by gel permeation chromatography (GPC), Fourier-transform infrared (FTIR), proton nuclear magnetic resonance (HNMR), differential scanning calorimetry (DSC), and transmission electron microscope (TEM). The composite coatings were prepared by mixing COPU or PEGPU as binders with RIO as an anticorrosive pigment in a pigment volume concentration (PVC) of 20%, 30%, and 40% to produce COPU20, COPU30, and COPU40 and PEGPU20, PEGPU30, and PEGPU40, respectively. All PVC of RIO were below the critical pigment volume concentration (CPVC) of 42.8%. COPU/RIO showed higher protection efficiency than PEGPU/RIO and 40% PVC in both PU resins exhibited the best protection performance.
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