Using Recycled Magnetite from Concrete Waste as a Pigment for Flexo Ink

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Document Type : Original Article

Authors

Formulation and Development of Applications of Chemical and Polymeric Compounds Research Group, Chemical, Polymeric and Petrochemical Technology Development Research Division, Research Institute of Petroleum Industry, P.O. Box 1599653111,

Abstract

The resulting magnetite was utilized as a pigment in flexographic water-based ink. X-ray diffraction (XRD) patterns, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), particle size analysis (PSA), rheology measurement, and color characteristics were used to characterize the ink and the recovered pigment. The recovered pigment particles exhibit Fe2O3, Fe3O4, or SiO2 phases according to XRD and SEM-EDX data. The PSA and SEM results showed that the recycled magnetite has a larger particle size than the original pigment, which affects color properties and shows a higher blackness. The color qualities and optical density are suitable for printing applications. The rheological properties are also affected by the particle size but the behavior is the same as the original ink, appropriate for printing applications.



The resulting magnetite was utilized as a pigment in flexographic water-based ink. X-ray diffraction (XRD) patterns, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), particle size analysis (PSA), rheology measurement, and color characteristics were used to characterize the ink and the recovered pigment. The recovered pigment particles exhibit Fe2O3, Fe3O4, or SiO2 phases according to XRD and SEM-EDX data. The PSA and SEM results showed that the recycled magnetite has a larger particle size than the original pigment, which affects color properties and shows a higher blackness. The color qualities and optical density are suitable for printing applications. The rheological properties are also affected by the particle size but the behavior is the same as the original ink, appropriate for printing applications.

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Main Subjects

Progress in Color, Colorants and Coatings

Articles in Press, Accepted Manuscript
Available Online from 29 April 2025

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