Preparation and properties of a cement-modified waterborne epoxy paint
[Introduction]The adhesion strength of waterproof polymer cement coatings urgently needs to be improved when applied to hydraulic concrete.[Method]Portland cement was used as the third component to modify a waterborne epoxy paint,and the effect of cement content(10%to 50%of the total mass of fillers comprising quartz sand and cement)on the mechanical and protective properties of the coating was studied.The modification mechanism of cement on waterborne epoxy emulsion was analyzed by scanning electron microscopy(SEM),X-ray diffraction(XRD),and Fourier-transform infrared spectroscopy(FTIR).[Result]The coating prepared with 40%of cement had an adhesion strength of 6.14 MPa,a tensile strength of 2.16 MPa,and an elongation at break of 156%,showing the optimal mechanical and protective properties.The degradation of adhesion strength and mass loss of the coating was the smallest and there was no water absorption and swelling phenomena after immersion in water and alkali as well as erosion test.[Conclusion]The addition of cement to the waterborne epoxy paint greatly improves the mechanical and protective properties of the coating.The epoxy emulsion accumulated and wraps quartz sand,cement,and its hydration products around,forming an interpenetrating network structure with epoxy emulsion as the main film-forming material and quartz sand,cement,and its hydration products as the secondary film-forming materials.The network structure is more compact due to the formation of CaCO3.
waterborne epoxy paintcementmodificationmechanical propertyadhesion strengthprotection of hydraulic concrete
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