材料科学
氧化铁
色散(光学)
乳状液
扫描电子显微镜
傅里叶变换红外光谱
化学工程
Zeta电位
涂层
硅烷
聚氨酯
核化学
复合材料
纳米颗粒
化学
冶金
纳米技术
工程类
物理
光学
作者
Mehmet Özdemir,Serap Mert,Ayşe Aytaç
出处
期刊:Pigment & Resin Technology
[Emerald (MCB UP)]
日期:2023-02-01
标识
DOI:10.1108/prt-10-2022-0123
摘要
Purpose This study aims to perform the surface treatment of synthetic α-Fe 2 O 3 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/approach For 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(δ)] and yield stress (τ 0 ) values were determined by performing amplitude and frequency sweep tests. Findings The τ 0 in SA coatings decreases with the amount of used A and increases with the amount of used CS. The τ 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/value To 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.
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