Role of surfactants on stability of iron oxide yellow pigment dispersions

Haramagatti, Chandrashekara R.; Dhande, Priya; Bhavsar, Ritesh; Umbarkar, Ajinkya; Joshi, Amit

doi:10.1016/j.porgcoat.2018.03.006

Cited by 17 publications

(6 citation statements)

References 17 publications

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“…For example, pigment dispersion of iron oxide yellow pigments with spherulitic morphology resulted in lower viscosity over the acicular morphology 12 . Haramagatti et al reported that iron oxide yellow pigment (PY42) dispersion was prepared using the mixture of dispersing agents (surfactants), evaluated of this pigment dispersion in an aqueous paint, and resulted in acceptable coloristic properties 14 . Han et al modified iron oxide yellow with sodium dodecyl sulfonate to form a hydrophobic layer on its surface, then added methyl methacrylate monomer and initiator to make it enter the hydrophobic layer for polymerization, and formed a polymer film on the surface of iron yellow particles, thus improving the dispersion stability and thermal stability of iron oxide yellow in organic media 15 .…”

Section: Introductionmentioning

confidence: 99%

Surface analysis of stearic acid modification for improving thermal resistant of calcium phosphate coated iron oxide yellow pigments

Pan

Cao

et al. 2020

Surface & Interface Analysis

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In order to widen the application of iron oxide yellow pigments (α‐FeOOH) in high temperature industry, α‐FeOOH coated with calcium phosphate (α‐FeOOH/Ca) were modified with stearic acid (Sa) through dry process. Scanning electron microscope (SEM), transmission electron microscope (TEM), X‐ray diffraction (XRD), Fourier transform infrared spectroscopy (FT‐IR), X‐ray photoelectron spectroscopy (XPS), and thermogravimetry (TG) were employed to characterize the effect of surface modification. The effects of Sa dosage on the thermal resistance of α‐FeOOH/Ca after modification were also discussed. The crystal structure of α‐FeOOH/Ca does not change after modification with Sa, but the ratio of length to diameter about α‐FeOOH/Ca is smaller. Sa can react with α‐FeOOH/Ca in the form of –COOCa and HPO42− based on FT‐IR and XPS analyses. TG‐DTG results suggest that calcium phosphate and Sa improve the thermal stability of α‐FeOOH. The value of color difference of modified α‐FeOOH/Ca first decrease and then increase with increasing of Sa dosage, which is studied by CIE ΔL, Δa, and Δb colorimetric analyses. The amount of Sa affects the thermal resistance and dispersion performance of α‐FeOOH/Ca simultaneously; also the relationship between thermal resistance and dispersion is inversely proportional. Experimental characterizations reveal that introduction of the phosphates and Sa not only prevents the loss of water on the surface of α‐FeOOH but improve its activation index and dispersibility in organic solvents.

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Section: Introductionmentioning

confidence: 99%

Surface analysis of stearic acid modification for improving thermal resistant of calcium phosphate coated iron oxide yellow pigments

Pan

Cao

et al. 2020

Surface & Interface Analysis

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“…The viscosities of XOP-9 and XOP-10 were intensely altered due to their long-chain spacer units, which led to significantly large molecular cross-sectional area values resulting in less adsorption of surfactant molecules onto the pigment surface. Additionally, the reason for high viscosities of these surfactants can be confirmed from their high PDI values (Haramagatti et al, 2018) Table 1.…”

Section: Apparent Viscositymentioning

confidence: 79%

Synthesis and Characterization of A‐B‐A‐Type Nonionic Dimeric Dispersants for Pigment Dispersion

Acheampong

Zhang

Agbo

et al. 2019

J Surfact & Detergents

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An acid‐catalyzed esterification method was employed to synthesize five A‐B‐A‐type nonionic dimeric surfactants (XOP‐3, XOP‐4, XOP‐6, XOP‐9, and XOP‐10) comprising of octyl phenyl ether (OP‐10) and a homologous series of α, ω‐dicarboxylic acids (C3, C4, C6, C9, and C10) as the spacer molecules. The various surfactants produced were characterized based on Fourier transform infrared (FT‐IR) spectroscopy, mass spectra (MS), and 1H NMR spectra. The newly synthesized series of surfactants were used for the dispersion of Hostaperm Pink E (Pigment Red 122) in an ultrasonic disruptor. Based on the selected pigment, the interfacial, colloidal, and rheological properties of the pigment dispersion were examined. The dispersion performances and properties of the surfactants produced differed based on the number of carbon atoms in hydrocarbon chains of the various spacer molecules. Due to this, surfactants created with short to moderate hydrocarbon chain spacer molecules exhibited a better dispersion performance than that of surfactants created with long hydrocarbon chain spacer molecules. The calculated cross‐sectional area values of the various surfactants synthesized confirmed their differences in dispersion performance and properties.

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“…A comprehensive understanding of the rheology of encapsulated dispersion is a great panacea to the prediction of the relative stability of the dispersion (Figure 11). In this rheological study, 121 the initial and accelerated stability of encapsulated pigment dispersions prepared with varying combinations of surfactants were evaluated and the relative rheological flow curves are exhibited. A careful study of the curves shows that the stability of the dispersion can be affected by the choice of surfactants.…”

Section: Performance Of Encapsulated Pigment Dispersionsmentioning

confidence: 99%

“…Rheological flow curve of pigment dispersions prepared from varying combinations of surfactants subjected to stability tests. AS, accelerated stability; NS, initial stability 121 …”

Section: Performance Of Encapsulated Pigment Dispersionsmentioning

confidence: 99%

An overview of the science and art of encapsulated pigments: Preparation, performance and application

Tawiah

Asinyo

Frimpong

et al. 2022

Coloration Technology

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Pigments are classified as organic or inorganic based on their chemical composition. 1,2 Typically, organic pigments comprise compounds of carbon elements that participate in covalent bonding, while inorganic pigments consist primarily of ground minerals such as metals, metallic salts (except barium salts of dyes) and metalloid salts, which do not contain carbon bonds. 3 Although some organic pigments may contain inorganic elements as stabilisers, organic pigments are defined primarily based on their congugated carbon bonds (except carbon black). 2 To improve the chemical, thermal, freeze-thaw and dispersion stability of organic pigments upon application, these classes of pigments have been the subject of extensive research over the years due to their obvious advantages. [4][5][6] Typically, the colour strength and optical properties of coated/printed substrates depend largely on the quality of the pigmented ink/paste and the nature of the substrate. The quality of the pigmented ink/paste then rests on the quality of the dispersion system (ie, the degree of the dispersion and its stability). 5,7 Dispersion stability is very important from the point of view of surface coatings and printing systems, especially for encapsulated inks that

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Role of surfactants on stability of iron oxide yellow pigment dispersions

Cited by 17 publications

References 17 publications

Surface analysis of stearic acid modification for improving thermal resistant of calcium phosphate coated iron oxide yellow pigments

Surface analysis of stearic acid modification for improving thermal resistant of calcium phosphate coated iron oxide yellow pigments

Synthesis and Characterization of A‐B‐A‐Type Nonionic Dimeric Dispersants for Pigment Dispersion

An overview of the science and art of encapsulated pigments: Preparation, performance and application

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