Preparation and evaluation of nanosized mixed calcium iron oxide (CaFe₂O₄) as high heat resistant pigment in paints

Abstract

Purpose -The purpose of this paper was to prepare and evaluate a nanosized mixed calcium iron oxide as a high heat-resistant pigment. Heat-resistant pigments can be defined as chemical substances that impart color to a substrate or binder and retain their color and finish at elevated temperatures. Mixed metal oxides have been widely used as pigments in coating formulations. Design/methodology/approach -This work presents synthesis of nanosized calcium iron oxide as an inorganic pigment by using simple synthesis technique, namely, solid-state calcination method, to study its heat and corrosion resistance. The prepared pigment was characterized by using X-ray diffraction, infrared spectroscopy, scanning electron microscopy and inductive coupling plasma. It was incorporated into paint formulations, and the heat, corrosion and mechanical resistance of dry paint film was evaluated. Findings -In this work, the prepared calcium iron oxide pigment showed excellent heat and corrosion resistance. Research limitations/implications -Heat-resistant coatings are required for industrial applications, mainly for reactors, exhaust pipes, space craft, stacks and similar equipments that are permanently and occasionally exposed to elevated temperatures. It was previously quite difficult to formulate heat-resistant organic coatings because of binder deficiencies; new vehicles for such applications are now available. Thus, the development of silicon resins has markedly advanced the utility of heat-resistant paints. High-temperature pigments are inorganic chemical compounds that impart and retain their color and finish to a substrate or binder at elevated temperatures. Practical implications -The nanosized mixed calcium iron oxide could be used as a pigment in paint formulations. It was found that it significantly enhances the heat, corrosion and mechanical resistance. It can also find numerous applications in other paint formulations for surface coating. Originality/value -The paper shows how the pigment consisting nanosized mixed calcium iron oxide could be used in heat-resistant paint formulations for coating metal surfaces.

Greener route for microwave enhanced syntheses of bioactive 1,5‐benzodiazepines using heterogeneous calcium ferrite/graphene oxide nanocomposite as a novel and sustainable catalyst

“…The peaks in the XRD pattern of calcium ferrite nanoparticles match with different phases of orthorhombic structure of calcium ferrite (post spinel—CaFe 2 O 4 and brownmillerite—Ca 2 Fe 2 O 5 ). The peaks at 24.92 (220), 29.24 (310), 31.98 (011), 33.43 (040), 41.29 (311), 43.52 (150), 49.33 (241) represent CaFe 2 O 4 (JCPDS: 50‐1746 and 72‐1199) while peaks at 33.00 (200), 46.60 (141), 52.40 (045), 57.89 (431), 59.23 (360) and 70.22 (282) correspond to Ca 2 Fe 2 O 5 (JCPDS: 71‐2264) . The XRD spectrum for GO shows a peak at 2θ = 10.47 (001) and 42.38 (100) characteristic of graphene oxide which disappears in the XRD patterns of CF/GO nanocomposite …”

Effect of Silane Coupling Agent Modification on Properties of Brass Powder-Water-Based Acrylic Coating on Tilia europaea

“…Art coating usually serves a decorative effect [ 1 , 2 , 3 ] but also has more robust protection than general coatings [ 4 , 5 ]. Studies [ 6 , 7 , 8 ] have shown that adding metal filler in the water-based coating and applying a modified art coating can lend the surface of buildings, furniture, and handicrafts a shiny metallic luster. Consequently, this modified coating provides a protective and decorative role to the applied products, causing an increase in added value [ 9 ].…”

The effects of coating colours on base papers

“…Pigments are accepted as the principal chemicals of coatings colours. In the literature, there are many studies conducted with the application of different pigments to the form of the coating process (Chinga and Helle, 2002;Morsy and El-Sherbiny, 2004;Fjellström et al, 2009;Aman, 2012;Arbatan et al, 2012;El-Sherbiny et al, 2014;Abd El-Wahab et al, 2015;Wahba et al, 2015;Morsy et al, 2016;Zhang et al, 2018;Ozcan and Tutak, 2020). Some are on the use and effects of natural and alternatively synthesised pigments in the surface coating of paper material.…”