Evaluation of the aminosilane and colloidal silica treated red iron oxide pigment effects in styrene acrylic and polyurethane dispersion

PurposeThis study aims to perform the surface treatment of synthetic alpha-Fe2O3 red iron oxide pigment with hydrolysate 3-aminopropyl silane (A) and colloidal silica (CS) and investigate the effects of surface-treated pigment on the styrene acrylic (SA) emulsion and polyurethane (PU) dispersion. Design/methodology/approachFor this purpose, firstly red iron oxide particles were modified with A and CS separately in an aqueous medium. After isolation of the modified iron oxide were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy with energy dispersive spectroscopy (SEM-EDS). Moreover, the degree of the dispersion stability of the modified pigment in coatings with SA emulsion and PU dispersion was investigated by using an oscillation rheometer. Loss (G''), storage (G') modulus, loss factor [tan(delta)] and yield stress (tau(0)) values were determined by performing amplitude and frequency sweep tests. FindingsThe tau(0) in SA coatings decreases with the amount of used A and increases with the amount of used CS. The tau(0) decreases as the amount of used A and CS in PU coatings increases. The use of CS on red iron oxide pigments causes storage modulus to increase in SA coatings at low angular frequencies, while it causes a decrease in PU coatings. Originality/valueTo the best of the authors' knowledge, for the first time, the suspended state of the iron oxide hybrid pigment formed with CS in the coating was investigated rheologically in this study.

Automated summary

This study aims to surface treat synthetic alpha-Fe2O3 red iron oxide pigment and investigate the effects on the SA emulsion and PU dispersion. The modified iron oxide particles were characterized using FTIR, XPS, and SEM-EDS. The dispersion stability of the modified pigment in coatings was investigated using an oscillation rheometer.