Iron-red-series low-gloss lamellar pigment and preparation method thereof

Abstract

The invention discloses an iron-red-series low-gloss lamellar pigment and a preparation method thereof, relating to the field of pearlescent pigments. Mica with the particle size of 0.15-5 mu m is used as a substrate, and iron oxide is coated on the substrate to form an iron oxide coating, wherein the coating is formed by carrying out hydrolysis in a ferric iron salt solution. The method comprises the following steps: mixing mica powder and water to form a suspension, adding a crystal grain regulator into the suspension, regulating the pH value, adding the ferric iron salt solution while stirring to perform hydrolysis coating, keeping the pH value of the suspension stable, continuing dropwisely adding the ferric iron salt solution until the a slightly purple red color phase is obtained, stirring, regulating the pH value of the solution, carrying out vacuum filtration, drying, calcining and cooling. Compared with the prior art, the prepared product is approximately spherical, is delicate and smooth, is very skin-friendly, has the advantages of high covering power and low gloss, has the matt effect, and can be widely used in cosmetics, leather, plastics, inks and paints.

Description

technical field [0001] The invention relates to the technical field of pearlescent pigments, in particular to an iron red series low-gloss lamellar pigment and a preparation method thereof. Background technique [0002] Pearlescent pigments can reproduce the elegant luster and color of natural pearls, shells, metals, swimming fish and butterflies. It relies on the refraction, reflection and projection of light to create hue and luster, and can give deep layers to plastic products and leather. Sense and special luster. The reason why pearlescent pigments give products a pearly luster is that they use natural muscovite or artificially synthesized mica or glass flakes as the core, and use a special chemical process to coat one or more layers of metal oxide on the surface of the core to form a powder. body pigment, so that it has a plane sandwich body very similar in structure to natural pearls, it can decompose composite light into various monochromatic lights like a prism, an...

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Problems solved by technology

And in the small particle size range, especially in D 50 The fine particle size of =1~5μm is rarely studied. First, because the particle size is very small, the yield of small particle size pigments is low, the energy consumption is high, the production cycle is long, the difficulty is great, and it is easy to be polluted; For pigments, the smaller the particle size, the more the number of particles, the more the number of edges, and the lower the gloss. When the particle size of the pearlescent pigment is less than 0.15-5 microns, the gloss of the prepared pearlescent pigment is very low. The gloss is in the matte range, so the production and researchers of pearlescent pigments think that there is no need for research; again, because the substrate used is thin, mainly phyllosilicate substances, the aspect ratio obtained by wet grinding (diameter / thickness) The thickness of the substrate is basically about 100 nanometers, which is close to or one-dimensional nanoscale. As we all know, due to the quantum effect of ultra-high specific surface area, nanomaterials are very easy to agglomerate and form when they are dried and calcined. Irregularly agglomerated particles with high cohesive strength, so that they lose the desired flake-like pigment properties

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